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DESCRIPTION JP2007143164

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DESCRIPTION JP2007143164
The invention relates to a vehicle audio system including directional loudspeakers, in particular a
directional array. A vehicle includes a first occupant position and a second occupant position
provided in front of the first occupant position. The audio system is positioned in front of the
first occupant position and aft of the second occupant position, and one of a low intensity
radiation direction and a high intensity radiation direction toward the first occupant position. A
first directional loudspeaker configured and arranged to radiate the first audio channel in a
directional manner such that the second direction of travel is the other direction of the second
Contains. [Selected figure] Figure 1
Directional electro-acoustic conversion method and system for vehicle
[0001]
The present specification discloses the use of directional loudspeakers in the vehicle passenger
compartments of a vehicle. One common type of directional loudspeaker is a directional acoustic
array. Information on directional acoustic arrays is disclosed in Harry F. Olson, Non-Patent
Document 1, Patent Document 1, and Patent Document 2.
[0002]
In one aspect of the invention, a vehicle audio system includes multiple audio channels. The
vehicle includes a first occupant position and a second occupant position ahead of the first
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occupant position. The audio system is configured such that a direction toward the first occupant
position is one of a low radiation direction and a high radiation direction, and a second radiation
direction. The first audio channel is configured and arranged to radiate directionally toward the
passenger position such that the direction toward the passenger position is the other of the low
radiation direction and the high radiation direction; And a first directional loudspeaker located
behind the occupant position. U.S. Patent No. 5,870,484 U.S. Patent No. 5,809,153 U.S. Patent
Application Publication No. 10 / 838,759 "Gradient Loudspeakers", J. of the Audio Engineering
Society, March 1973 , Volume 21, Number 2,
[0003]
The directional loudspeaker may be further configured and arranged to emit a second audio
channel. Furthermore, in the directional loudspeaker, the direction toward the occupant position
at which the low intensity radiation direction of the first audio channel is directed is the high
intensity radiation direction of the second audio channel, and the first audio An arrangement and
arrangement which radiates the second audio channel directionally such that the high intensity
radiation direction of the channel is directed towards the occupant position towards which the
second audio channel is directed; It may have been. A third occupant position is disposed to the
right of the first occupant position and to the right of the second occupant position, and a second
occupant position and the third occupant position are on the right of the first occupant position.
There may be further included a fourth occupant position disposed rearward. The directional
loudspeakers are located behind the second occupant position and the third occupant position,
ahead of the first occupant position and the fourth occupant position, to the right of the first
occupant position and the second occupant position, and It is attached to the left of the third
occupant position and the fourth occupant position. The directional loudspeaker further radiates
directionally of the third audio channel such that the direction toward the third occupant position
is one of the low intensity radiation direction and the high intensity radiation direction. And the
directional radiation configuration and arrangement of the fourth audio channel such that the
low intensity radiation direction of the third audio channel is directed to the high intensity
radiation direction of the fourth audio channel. It can be done. The audio system may further
include circuitry for delaying one of the first audio channel signal and the second audio channel
signal to the first directional loudspeaker. Furthermore, the audio system may further include
circuitry for delaying the other of the first audio channel signal and the second audio channel
signal to the second directional loudspeaker.
[0004]
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Directional loudspeakers may be mounted inside the door of the vehicle. The directional
loudspeaker may be mounted in or on the seat back of the seat provided at the second occupant
position. Directional loudspeakers may be mounted inside the headliner of the vehicle.
Directional loudspeakers may be mounted inside the B-pillar.
[0005]
The audio system further includes a second loudspeaker positioned in front of the second
occupant position and configured and arranged to emit a first audio channel. It is further possible
for the first loudspeaker to be configured and arranged to radiate the first audio channel
directionally such that the direction to the first occupant position is a high intensity radiation
direction, The second loudspeaker is a directional loudspeaker configured and arranged to emit
the first audio channel such that the direction to the second occupant position is a high intensity
radiation direction. The second loudspeaker may be configured and arranged to emit the first
audio channel such that the direction towards the windshield of the vehicle is a low intensity
radiation direction.
[0006]
The first directional loudspeaker may alternatively be configured and arranged to radiate
omnidirectionally or directionally based on predetermined criteria. The predetermined standard
includes whether or not an occupant is aboard at the first boarding position. The audio system
may further include a detector for detecting whether the occupant is in the first riding position.
[0007]
The SPL (sound pressure level) in the low intensity radiation direction is at least -6 dB greater
than the maximum radiation intensity in any direction at points equidistant from the directional
loudspeaker. The SPL in the low intensity radiation direction is at least -10 dB greater than the
maximum radiation intensity in any direction at points equidistant from the directional
loudspeaker. The SPL in the high intensity radiation direction is within 4 dB of the maximum
radiation intensity in any direction at a point equidistant from the directional loudspeaker.
[0008]
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The vehicle includes a third occupant position located aft of the first occupant position. The
audio system is located behind the first directional loudspeaker and in front of the third occupant
position, and one of the low-intensity direction and the high-intensity direction toward the first
occupant position. Of the first audio channel so that the direction toward the third occupant
position is the other of the low intensity radiation direction and the high intensity radiation
direction. Further includes a second directional loudspeaker configured and arranged. The
second directional loudspeaker is configured such that the direction toward the third occupant
position is a high intensity radiation direction, and the direction toward the first occupant
position is a low intensity radiation direction. It can be configured and arranged to radiate
directionally of the audio channel of
[0009]
The directional loudspeakers may alternatively be configured and arranged to emit a first audio
channel or audio signal from the auxiliary device. The auxiliary device may be a wireless
telephone.
[0010]
The audio system may include circuitry for delaying the audio signal of the first audio channel to
the first directional loudspeaker.
[0011]
The first directional loudspeaker directionally directs the second audio channel such that the
direction toward the first occupant position is the other of the low intensity radiation direction
and the high intensity radiation direction. It may be configured and arranged to radiate.
The first directional loudspeaker directionally directs the second audio channel such that the
direction toward the second riding position is the other of the low intensity radiation direction
and the high intensity radiation direction. It can further be arranged and arranged to emit. The
SPL in the low intensity radiation direction is at least -6 dB greater than the maximum radiation
intensity in any direction at points equidistant from the directional loudspeaker.
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[0012]
The audio system further includes a third occupant position located forward of the first occupant
position and to the right of the second occupant position. In the first directional loudspeaker, the
direction toward the second occupant position is a high-intensity radiation direction, and more
acoustic energy is directed to the third occupant position than the second occupant position As
such, it may be configured and arranged to radiate the first audio channel directionally. The
directions towards the second occupant position and the third occupant position may both be
high intensity radial directions.
[0013]
In another aspect of the present invention, an audio system including a plurality of audio
channels for a vehicle including a first occupant position and a second occupant position located
forward of the first occupant position. In the operation method, the direction toward the first
occupant position is one of the low intensity radiation direction and the high intensity radiation
direction, and the direction toward the second occupant position is low intensity radiation. And
the step of directional radiation so as to be the other of the high-intensity radiation directions.
[0014]
The method may further include the step of emitting a second audio channel.
In the step of emitting the second audio channel, the direction toward the occupant position at
which the low intensity radiation direction of the first audio channel is directed is the high
intensity radiation direction of the second audio channel, and Stepwise radiating the second
audio channel such that the high intensity radiation direction of one audio channel is directed
towards the low occupant direction of the second channel. May be included. The vehicle has a
third occupant position located to the right of the first occupant position and to the right of the
second occupant position, and a right rear of the second occupant position to the right of the first
occupant position. And a fourth occupant position located rearward of the third occupant
position. The directional loudspeaker is disposed behind the second and third occupant positions
and in front of the first and fourth occupant positions and to the left of the third and fourth
occupant positions. Can be attached to Said method directivityally emitting the third audio
channel such that the direction toward the third occupant position is one of the low intensity
radiation direction and the high intensity radiation direction; Radiating the fourth audio channel
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in a directional manner such that the low intensity radiation direction of the third audio channel
is directed to the high intensity radiation direction of the fourth audio channel May be included.
The method may further include the step of delaying one of the signal of the first audio channel
and the signal of the second audio channel with respect to the first directional loudspeaker. The
method may further include the step of delaying the other of the signal of the first audio channel
and the signal of the second audio channel. The method may further include the step of
omnidirectionally emitting the second audio channel.
[0015]
The vehicle may further include a second loudspeaker located in front of the second occupant
position. The method may further include the step of emitting a second audio channel. The step
of emitting the second audio channel may further include the step of directivityally emitting the
second audio channel such that the direction toward the second occupant position is a high
intensity radiation direction. The step of emitting the second audio channel may further include
the step of directionally emitting the second audio channel such that the direction toward the
front window of the vehicle is a low intensity radiation direction.
[0016]
The step of directing radiation may alternatively include one of omnidirectional radiation or
directional radiation based on predetermined criteria. The predetermined reference includes
whether the occupant is at the first occupant position. The method may further include a
detector that detects whether the occupant is at the first occupant position. The SPL in the low
intensity radiation direction is at least -6 dB greater than the maximum radiation intensity in any
direction at points equidistant from the directional loudspeaker. The SPL in the low intensity
radiation direction is at least -10 dB greater than the maximum radiation intensity in any
direction at points equidistant from the directional loudspeaker. The SPL in the high intensity
radiation direction is within 4 dB with respect to the maximum radiation intensity in any
direction at a point equidistant from the directional loudspeaker.
[0017]
The vehicle may include a third occupant position located aft of the first occupant position. The
audio system may further include a second directional loudspeaker located behind the first
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directional loudspeaker and before the third occupant position. In the method, the direction
toward the first occupant position is one of the low intensity radiation direction and the high
intensity radiation direction, and the direction toward the third occupant position is a low
intensity radiation direction and The method may further include the step of directionally
emitting the first audio channel to be the other of the high intensity radiation directions. In the
method, the direction toward the third occupant position is a high intensity radiation direction,
and the direction toward the occupant position to which the high intensity radiation of the first
channel is directed is a low intensity radiation direction. As such, it may further include the step
of emitting the second audio channel directionally.
[0018]
The method directionally radiates the first audio channel or audio signal from the auxiliary
device such that the direction toward the second passenger position is a high intensity radiation
direction toward the second occupant position. May alternatively include. The auxiliary device
may be a wireless telephone.
[0019]
The method may include the step of delaying the audio signal of the first audio channel to the
first directional loudspeaker.
[0020]
According to the operation method of the vehicle audio system, the direction toward the second
occupant position is one of the low-intensity radiation direction and the high-intensity radiation
direction, and the direction toward the first occupant position is low. The method may further
include the step of directionally emitting the second audio channel so as to be the other of the
high radiation direction and the high radiation direction.
The SPL in the high intensity radiation direction is within 4 dB of the maximum radiation
intensity in any direction at a point equidistant from the directional loudspeaker.
[0021]
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In another aspect, a vehicular audio system includes a riding position and an acoustically
reflective surface. In the directional loudspeaker, the direction toward the occupant position is
one of the high intensity radiation direction and the low intensity radiation direction, and the
high intensity radiation direction and low intensity radiation toward the acoustic reflection
surface It is configured and arranged to radiate acoustic energy directionally so as to be the
other radiation direction out of the directions. The acoustically reflective surface may be a front
window. The acoustically reflective surface may be one of a tailgate window and a rear window.
[0022]
In another aspect, a method of operating an audio system for a vehicle having an occupant
position and an acoustically reflective surface, the direction towards the occupant position being
one of a high intensity radial direction and a low intensity radial direction. And directing acoustic
radiation such that the direction toward the acoustically reflective surface is the other of the high
intensity radiation direction and the low intensity radiation direction. The acoustically reflective
surface may be a front window. The acoustically reflective surface may be one of a tailgate
window and a rear window.
[0023]
In another aspect, the vehicle includes a passenger location and a microphone for detecting
acoustic energy. The audio system for a vehicle is configured and arranged to radiate
directionally so that the direction toward the occupant arrangement is a high intensity radiation
direction and the direction toward the microphone is a low intensity radiation direction. Include
loud loudspeakers. The microphone may be a component of a noise compensation system for a
vehicle. The microphone may be a component of a wireless telephone. The microphone may be a
directional microphone whose direction from the microphone to the directional loudspeaker is a
low detection direction. The direction from the microphone towards the occupant placement may
be a high detection direction.
[0024]
In another aspect, the vehicle audio system includes a plurality of audio channels, a directional
loudspeaker, and a directional loudspeaker emitting an audio channel of one of the audio
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channels. And an operation mode, and a second operation mode characterized in that the
directional loudspeaker emits one of the different audio channels. One audio channel among the
audio channels may be the center channel, and one different audio channel among the audio
channels may be one of the right and left channels. The second mode of operation is further
characterized in that the directional loudspeaker radiates the other of the right and left channels.
The directional loudspeaker radiates the left channel directionally so that the direction toward
the right occupant position is a high intensity radiation direction, and the direction toward the
left occupant position is a high intensity radiation direction The right channel can be emitted
directionally. The directional loudspeaker radiates the left channel directionally so that the
direction toward the left occupant position is a low intensity radiation direction, and the direction
toward the right occupant position is a low intensity radiation direction The right channel can be
emitted directionally. The directional loudspeakers are constructed and arranged such that the
radiation source of the center channel is felt to be a video display. The directional loudspeaker
can emit the center channel towards the video display such that the radiation of the center
channel reflects the video display. The first mode of operation is characterized in that the
directional loudspeaker radiates the center channel such that the direction towards the front
passenger position is a low intensity radiation direction.
[0025]
In another aspect, a vehicular audio system includes a plurality of audio channels and a plurality
of directional loudspeakers. The method of operation of the audio system is characterized by the
step of one of the directional loudspeakers radiating directionally one of the first radiation
pattern and the second radiation pattern. Radiating the first directional radiation pattern includes
radiating the center channel by the first plurality of directional loudspeakers. And, emitting the
second directional radiation pattern includes emitting the center channel by one of the
directional loudspeakers not included in the first plurality of directional loudspeakers. The
method of operation further alternatively includes the step of emitting one of the first directional
radiation pattern and the second directional radiation pattern by a second one of the plurality of
directional loudspeakers. . The method of operating the vehicle audio system further comprises
the step of the user selecting a first radiation pattern or a second radiation pattern. The method
of operating the vehicle audio system further includes the step of automatically selecting the first
radiation pattern or the second radiation pattern based on the determined condition.
[0026]
In another aspect, a vehicle audio system includes a directional loudspeaker mounted within a
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vehicle door. The directional loudspeakers may be directional arrays. The audio system further
includes a plurality of channels with surround channels. The directional loudspeakers are
configured and arranged to radiate the surround channel in a directional manner such that the
forward direction of the vehicle is a high intensity radiation direction. The audio system is
configured and arranged to radiate the surround channel in a directional manner such that the
direction toward the rear of the vehicle is a low intensity radiation direction. The audio system
can be configured and arranged to radiate the other audio channel directionally among the
plurality of audio channels such that the direction toward the rear of the vehicle is a high
intensity radiation direction. The audio system may be configured and arranged to radiate the
other audio channel out of the plurality of audio channels in a directional manner such that the
forward direction of the vehicle is a low intensity radiation direction. The audio system may be
configured and arranged to radiate the other audio channel in a directional manner among the
plurality of audio channels such that the direction toward the rear of the vehicle is a high
intensity radiation direction. The audio system may alternatively be configured and arranged to
radiate the surround channel directionally or omnidirectionally.
[0027]
The audio system includes multiple audio channels with surround channels. The directional
loudspeakers are configured and arranged to emit surround channels toward the front of the
vehicle.
[0028]
Other features, objects, and advantages of the present invention are apparent from the following
detailed description in conjunction with the accompanying drawings.
[0029]
Although some elements in the several figures are shown and described as specific elements of
the block diagram and referred to as "circuits", unless otherwise indicated, the elements are one
of analog and digital circuits. Or a combination thereof or one or more microprocessors
executing software instructions.
Software commands include digital signal processing (DSP) commands. Some elements (eg, signal
lines, amplifiers, equalizers, signal processing circuits, and the like) are not shown. Some
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embodiments described herein utilize an audio system (eg, 5 channels or 5.1 channels) with 5
directional channels as an example. The principles described herein can be applied to more or
less than five directional channels (e.g., 4.1, 6.1 or 7.1). For the sake of simplicity, "an audio
signal representing audio information encoded in channel y" is "an audio signal in channel y" and,
furthermore, "emitting acoustic energy corresponding to the audio signal in channel y" Is called
"emit channel y". As shown below, "in front of" means "closer to the front of the vehicle than".
Also, "rear of" means "closer to the rear of the vehicle than". The terms "in front of" and "back of"
mean "immediately before" and "immediately after" but this is not necessarily the case. The term
"laterally outside" means "closer to the nearest side of the vehicle than".
[0030]
A directional loudspeaker is a loudspeaker that has a radiation pattern that radiates acoustic
energy in some directions more than in other directions. A directional array is a directional
loudspeaker that has a number of acoustic energy sources. In a directional array, pressure waves
emitted by an acoustic energy source are destructively interfered over a range of frequencies
where the corresponding wavelength is strongly related to the spacing of the energy sources, as
a result of which said pointing is The sexual array emits some acoustic energy in different
directions depending on the degree of destructive interference generated. The sound pressure
level in any direction at a point where a larger acoustic energy is radiated in a directional
manner, for example, at an equal distance from the directional loudspeaker, is within 6 dB
(preferably −) of the maximum sound pressure level (SPL) The direction of 6 dB to -4 dB, ideally
-4 dB to -0 dB) is taken as the "high intensity radiation direction". The sound pressure level is at
least -6 dB (preferably -6 dB to -10 dB) with respect to the maximum sound pressure in any
direction where acoustic energy is hardly radiated, for example, at a point equidistant from the
directional loudspeaker A direction ideally set to -10 dB or more (e.g. -20 dB) is considered as "a
low-intensity radiation direction". In all the drawings, the directional loudspeaker is represented
as a loudspeaker having two cone-type acoustic drivers. The directional loudspeaker may be a
type of ride speaker other than a multi-element loudspeaker. A directional array comprises at
least two acoustic energy sources, and many directional arrays comprise two or more acoustic
energy sources. For example, by controlling the radiation pattern in one or more planes, the
increase in the number of acoustic energy sources increases the need to control the radiation
pattern of the directional loudspeaker. The directional loudspeakers in the drawings represent
the arrangement of the loudspeakers, but not necessarily the number or orientation of the
acoustic energy sources. The number and orientation of acoustic energy sources and the signal
processing required to create a directional radiation pattern are accomplished by implementing
the techniques described in the Background section.
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[0031]
The directional characteristics of the loudspeaker are generally displayed polar as in the polar
coordinates of FIG. The polar plot 10 represents the radiation directivity characteristics of the
directional loudspeaker (in this case the so-called "cardioid" pattern). Polar plot 12 represents the
radiation pattern (in this case, the dipole pattern) in the second type of directional loudspeaker.
Polar plots 10, 12 show directional radiation patterns. The low intensity radiation directions
indicated by dotted line 14 may be "null directions" but need not necessarily be "null directions".
The null direction originates from the centroid of the acoustic energy source and is connected to
a point that is locally at the lowest sound pressure level relative to other points equidistantly
spaced from the acoustic energy source It is illustrated by. The high intensity radiation direction
is indicated by the solid line 16. In polar coordinates, the vector length in the high intensity
radial direction represents the relative amount of acoustic energy radiated in that direction. For
example, in a cardioid polar pattern, more acoustic energy is emitted towards direction 60 than
direction 62.
[0032]
The vehicle audio system described below includes directional loudspeakers that radiate acoustic
energy in some directions more than in other directions. In most circumstances, the direction in
which the greater acoustic energy is emitted (as described above) is the direction of high
intensity radiation, and the direction in which the acoustic energy is not emitted (as described
above) is the direction of lower intensity radiation. It is desirable to have. However, in most
situations, even if the direction in which the acoustic energy is emitted more and the direction in
which the acoustic energy is hardly emitted are both high-intensity radiation directions, some
overcome the conventional audio system Improvement points can be obtained. It should be noted
that in the present context the direction in which the acoustic energy is emitted more and the
direction in which the acoustic energy is hardly emitted are both particularly adapted to be high
intensity radiation directions.
[0033]
FIG. 2A represents a diagram for a portion of the vehicle interior 18. A front seat passenger
position 20 and a rear seat passenger position 22 are provided inside the vehicle. A directional
loudspeaker 24 at the center of the vehicle is mounted behind the front seat occupant position
20 and in front of the rear seat occupant position 22, preferably on the outside of the front seat
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occupant position 20 and the rear seat occupant position 22 (e.g. The rear door, the B-pillar, the
seatback provided on the seat at the front passenger position 20, or the ceiling) is attached. In
FIG. 2A and all other figures, the arrangement of the directional loudspeakers is defined by the
position of the directional loudspeakers relative to the occupant position and not by the typical
structural elements described above. For example, the arrangement of the directional
loudspeakers 24 in the center of the vehicle is not limited to the B-pillar, the rear door, or the
interior of the seat back. A rear directional loudspeaker 26 is mounted behind the rear passenger
position 22 and preferably outside the passenger position. The directional loudspeakers 24, 26
are components of a sound system having at least one surround channel in this exemplary left
surround (LS) channel. A forward directional loudspeaker mounted at the front of the front
passenger position 20 and preferably at the outer side of the passenger position (for example, at
the A-pillar, dashboard, footwell or front door) There are also thirty. The drawing shows the
directional characteristics of the directional loudspeaker in the horizontal plane. By means of
directional loudspeakers, the direction with vertical components is a high intensity radiation
direction or a low intensity radiation direction. The directional loudspeaker is defined and
configured to radiate directionally so that the direction toward the head of the occupant is a high
intensity radiation direction or a low intensity radiation direction. In the following, the occupant
position includes the head height of the occupants of the vehicle.
[0034]
The directional loudspeaker 24 in the central portion of the vehicle has a high intensity radiation
direction 120 toward the front seat occupant position 20 and a low intensity radiation direction
122 toward the rear seat occupant position 22. , And are configured and arranged to emit the LS
channel. The rear directional loudspeaker 26 has an LS channel such that the direction 222
towards the rear seat occupant position 22 is a high intensity radiation direction and the
direction 228 towards the rear window 28 is a low intensity radiation direction. It radiates in a
directional manner. Alternatively, the rear directional loudspeaker 26 may be directed such that
the direction 222 towards the rear passenger position 22 is a low intensity radiation direction
and the direction 228 towards the rear window 26 is a high intensity radiation direction. May be
configured and arranged. In another embodiment, the directional loudspeakers 26, 30 may be
replaced by conventional omnidirectional loudspeakers.
[0035]
FIG. 2B also represents a diagram for the vehicle interior 18. In the arrangement shown in FIG.
2B, the directional loudspeaker 24 at the center of the vehicle has a high strength in the direction
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422 towards the rear occupant 22 in order to make the direction 420 towards the front occupant
position 20 a low intensity radiation direction. Emit the L (left) channel to be in the radial
direction of The front directional loudspeaker 30 directs the L channel so that the direction 320
towards the occupant position 20 is a high intensity radiation direction and the direction 332
towards the front window 32 is a low intensity radiation direction. Are configured and arranged
to radiate.
[0036]
FIG. 2C is a diagram of the interior 18 of the vehicle, combining the arrangements of FIGS. 2A
and 2B.
[0037]
In the audio system of FIG. 2C, the loudspeaker 24 of FIG. 2C radiates more acoustic energy from
the first channel in the first direction than the second direction and at the same time, the fourth.
It emits more acoustic energy from the second channel in the third direction than the direction.
In some embodiments, the second direction may be the same as the third direction, or the first
direction may be the fourth direction. Alternatively, the second direction is the same as the third
direction, and the first direction is the fourth direction. In other words, a single loudspeaker
emits two different audio signals simultaneously with two different radiation patterns.
Techniques for doing this are disclosed in one or more of the documents cited in the background.
An occupant at a first occupant position receives acoustic energy corresponding to a first channel
that is greater than the acoustic energy corresponding to the second channel. Then, the occupant
at the second occupant position located behind or in front of the first occupant position receives
the acoustic energy corresponding to the second channel that is larger than the acoustic energy
corresponding to the first channel.
[0038]
The arrangement shown in FIGS. 2A-2C has many advantages. While the L channel is radiated
directionally from the front left passenger position toward the front passenger position 20 and
the rear passenger position 22 at the same time, the L channel is emitted from any vehicle from
the rear of the vehicle. There is almost no radiation towards the occupants in position. While the
LS channel is directed radiated towards the occupants of both the front seat occupant position
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20 and the rear seat occupant position 22 from the relatively left rear occupant position, the LS
channel can be There is almost no radiation towards the occupants in position. This provides a
better sound image.
[0039]
Referring to FIG. 2D, by utilizing a delay, ie, so that the first directional loudspeaker emits an
audio signal after the radiation of the second loudspeaker, the second loudspeaker (directivity It
is understood that the sound image can be further improved by delaying the audio signal applied
to the first directional loudspeaker relative to the audio signal applied to the loudspeaker). For
example, the audio system may have a delay 29 L for delaying the L signal to the directional
loudspeaker 24 at the center of the vehicle relative to the L signal to the directional loudspeaker
30 at the front. The listener at the front passenger position 20 hears the radiation from the L
channel from the front directional loudspeaker 30 before listening to the radiation from the
directional loudspeaker 24 in the center of the vehicle. By listening to the L channel radiation
from the front directional loudspeaker 30 before listening to the L channel radiation from the
directional loudspeaker 24 in the middle of the vehicle by the aforementioned effect (also called
the Haas effect), The listener at the seat occupant position 20 recognizes that the radiation
source of the L signal is a forward directional loudspeaker. Because the front-seat occupant
position 20 occupants receive more L radiation from the directional loudspeakers 30 in front of
them than from the directional loudspeakers 24 in the middle of the vehicle, the front directional
loudspeakers 30 This provides a time cue that provides a magnitude cue to further enhance the
sound image, as it tends to recognize it as an L channel radiation source.
[0040]
Similarly, the audio system may be directed backwards to the directional loudspeaker 26 such
that the above-described effect provides a magnitude cue for the occupant of the rearward
occupant position 22 to recognize that the LS radiation source is the rearward directional
loudspeaker 26. A delay 29 LS may be included to delay the LS signal to the directional
loudspeaker 24 in the middle of the vehicle, relative to the The amount of delay may be
determined such that the LS radiation that first reaches the position 20 of the passenger listening
in the front seat is the radiation from the directional loudspeaker 26 in the rear. This allows the
occupant in the front occupant position 20 to feel the sound spread more strongly.
[0041]
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A further advantage of the arrangement of FIGS. 2A-2C is that if the conventional loudspeakers
are arranged in the same position as the front directional loudspeaker 30 and the rear directional
loudspeaker 26, the rear window 28 and the front window The early reflection from 32 is less
than itself. The early reflection is a reflection that occurs because the path length to the listening
space is not sufficiently longer than the path length of direct radiation. Early radiation is
undesirable because it adversely affects the frequency response of the speaker. The frequency
response degradation due to early radiation occurs at different frequencies at different locations
within the vehicle and is difficult to treat by conventional methods (e.g., equalization). An
alternative embodiment having similar advantages is shown in FIGS. 2A and 2C, where the
direction 222 towards the rear occupant position 22 is a low intensity radiation direction and the
direction 228 towards the reflective surface is The radiation pattern is arranged to be a high
intensity radiation direction. By utilizing this arrangement, the deterioration of the frequency
characteristics described above is reduced, and the occupant at the occupant position 22 in the
rear seat can easily recognize that the LS channel reduction is the rear window 28.
[0042]
Figures 3A and 3B represent diagrams of the interior of a vehicle equipped with an audio system.
The drawings are intended for vehicles having two or more rows of seats, such as vans, minivans,
sports utility vehicles (SUVs), and the like. Inside the vehicle there are several occupant positions.
In this case, inside the vehicle, an occupant position 20L on the left front and an occupant
position 20R on the right front, an occupant position 21L at the left center and an occupant
position 21R at the right center, an occupant position 22L at the left rear and a right rear There
is an occupant position 22R. The left front directional loudspeaker 30L and the right front
directional loudspeaker 30R are attached to the front and preferably the outer side of the front
occupant positions 20L and 20R (for example, inside the front door or dashboard) . A directional
loudspeaker 34L at the left forward mid-vehicle part and a directional loudspeaker 34R at the
right forward mid-vehicle behind the front occupant positions 20L and 20R, It is preferably
attached to the outside of the occupant position and in front of the occupant positions 21L and
21R in the center of the vehicle, preferably to the outside of the occupant position (for example, a
rear door or a ceiling). The directional loudspeaker 36L at the rear left of the vehicle center (left
rearward mid-vehicle) and the directional loudspeaker 36R at the rear right (mid rear vehicle) are
located behind the central occupant positions 21L and 21R. Preferably, it is attached to the
outside of the occupant position and in front of the rear occupant positions 22L and 22R,
preferably to the outside of the occupant position (for example, side walls and a ceiling). The rear
directional loudspeakers 26L, 26R may be attached to the rear of the rear occupant positions
22L, 22R, and may be attached to the outside of the occupant position (e.g., side walls, ceiling or
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tailgate). A central front directional loudspeaker 30C is mounted in front of the front occupant
positions 20L and 20R and between the occupant positions (for example, dashboard, rearview
mirror, floor console or ceiling). A central rear directional loudspeaker 26C is mounted aft of the
rear occupant positions 22L and 22R and between the occupant positions (eg, tailgate or ceiling).
A directional loudspeaker 38 in front of the center of the vehicle is mounted between the
positions of the occupants behind the occupant positions 20L, 20R in front and in front of the
occupant positions 21L and 21R in the center (for example, a console And the ceiling).
A directional loudspeaker 40 at the rear of the center of the vehicle is mounted behind the
central occupant positions 21L and 21R, in front of the rear occupant positions 22L and 22R and
between the occupant positions (for example, a console or a ceiling) ). The video display 42 is
mounted such that the screen can be viewed from the central and rear occupant positions (e.g.,
the back of the console or the ceiling). The directional loudspeakers 40 behind the center of the
vehicle may be attached to any suitable structural element and is not limited to the rear of the
console or the ceiling. The directional loudspeakers 38 in front of the central part of the vehicle
and the directional loudspeakers 40 in the rear of the central part of the vehicle both radiate four
different channels L, R, LS and RS in a directional manner. In another embodiment, directional
loudspeakers 38 in front of the center of the vehicle and directional loudspeakers 40 behind the
center of the vehicle also radiate center channel C. The directional loudspeakers 38 in front of
the center of the vehicle and the directional loudspeakers 40 in the rear of the vehicle center
have two independent directional loudspeakers or two or more elements, like four acoustic
drivers. It is implemented as a directional loudspeaker.
[0043]
FIG. 3A represents the high intensity radiation direction in an audio system operating in a first
mode called "music mode". The left front directional loudspeaker 30L directivityally radiates the
left channel such that the direction toward the front left occupant position 20L is a high intensity
radiation direction. The central front directional loudspeaker 30C directivityally radiates the right
channel so that the direction toward the left front occupant position 20L is a high intensity
radiation direction, and the direction toward the right front occupant position 20R is high
intensity Directionally radiate the left channel to be the radiation direction of The right front
directional loudspeaker 30R directivityally radiates the right channel such that the direction
toward the front right occupant position 20R is a high intensity radiation direction. The
directional loudspeaker 34L in front of the left central part of the vehicle directionally radiates
the left surround channel so that the direction toward the left front passenger position 20L is a
high intensity radiation direction, and the left central passenger position 21L Directionally
radiates the left channel so that the direction toward it is a high intensity radiation direction. A
10-04-2019
17
multi-element directional loudspeaker 38 in front of the center of the vehicle radiates the right
surround channel directionally so that the direction toward the front left passenger position 20L
is a high intensity radiation direction, and the front right passenger position 20R Directionally
radiates the left surround channel so that the direction toward is the high intensity radiation
direction, and directionally radiates the right channel so that the direction toward the central
occupant position 21L is the high intensity radiation direction And radiate the left channel in a
directional manner such that the direction toward the right center occupant position 21R is a
high intensity radiation direction. The directional loudspeaker 34R in front of the center of the
right vehicle radiates the right surround channel in a directional manner so that the direction
toward the front right passenger position 20R is a high intensity radiation direction, and goes to
the right center passenger position 21R Directionally radiates the right surround channel so that
the direction is a high intensity radiation direction and radiates the right channel signal so that
the direction toward the right center occupant position 21R is a high intensity radiation direction
Do. A directional loudspeaker 36L at the rear of the left center of the vehicle directionally
radiates the left surround channel so that the direction toward the occupant position 21L at the
left center is a high-intensity radiation direction, and the occupant position 22L at the left rear
Directionally radiates the left channel so that the direction toward it is a high intensity radiation
direction. A directional loudspeaker 40 at the rear of the center of the vehicle directionally
radiates the right surround channel so that the direction toward the left center occupant position
21L is a high-intensity radiation direction, and goes toward the right center occupant position
21R. Directionally radiates the left surround channel so that the direction is high-intensity
radiation, and radiates the right channel directionally so that the direction toward the left rear
occupant position 22L is high-intensity radiation. And radiate the left channel in a directional
manner such that the direction toward the rear right passenger position 22R is a high intensity
radiation direction.
A directional loudspeaker 36R behind the center of the right side of the vehicle directionally
radiates the right surround channel so that the direction toward the occupant position 21R at the
center of the right is a high-intensity radiation direction, and the occupant position 22R to the
right rear Directionally radiate the right channel so that the heading direction is a high intensity
radiation direction. When mounted as shown, the left rear directional loudspeaker 26L radiates
the left surround channel in all directions as shown. When the left rear directional loudspeaker
26L is placed at a position where it is reflected early as in the side wall, the left rear directional
loudspeaker 26L has high strength in the direction toward the left rear occupant position 22L.
Directly radiate the LS channel so that the radiation direction of The central rear directional
loudspeaker 26C directivityally radiates the right surround channel so that the direction toward
the left rear occupant position 22L is a high intensity radiation direction, and the direction
toward the right rear occupant position 22R is Directionally radiates the left surround channel so
that the radiation direction is high intensity. When mounted as shown, the right rear directional
loudspeaker 26R radiates the right surround channel in all directions as shown. When the right
10-04-2019
18
rear directional loudspeaker 26R is placed at an early reflection position like a side wall, the right
rear directional loudspeaker 26R has high strength in the direction toward the right rear
occupant position 22R. Directionally radiate the right surround channel to be the direction of
radiation of
[0044]
Some audio material (audio material) may have center channel information. Center channel
speakers (directional loudspeakers) such as 44RF, 44LI, 44LR, and 44RR, as indicated by the
parenthetical expression in FIG. 3A, for emitting center channel information in music mode But it
does not have to be so). Alternatively, the center channel can be mixed with both left and right
channels, as shown by the bracketed display in FIG.
[0045]
FIG. 3B represents the low intensity radiation direction in the audio system of FIG. 3A operating
in music mode. The left front directional loudspeaker 30L directionally radiates the left channel
such that the direction toward the front window 32 is a low intensity radiation direction. The
central front directional loudspeaker 30C radiates directionally to the left channel so that the
direction toward the left front occupant position 20L is a low intensity radiation direction, and
the direction toward the right front occupant position 20R is low Directionally radiate the right
channel so as to be in the direction of intensity radiation. The right front directional loudspeaker
30R radiates directionally the right channel such that the direction toward the front window 32
is a low intensity radiation direction. A directional loudspeaker 34L in front of the left central
part of the vehicle directionally radiates the left channel so that the direction toward the left
front passenger position 20L is a low-intensity radiation direction, and the left central part in the
left central riding position 21L Directionally radiate the left surround channel so that the heading
direction is the low intensity radiation direction. The directional loudspeaker 38 in front of the
center of the vehicle radiates the right channel, the left channel, and the left surround channel in
a directional manner so that the occupant position 20L in the left front is a low intensity
radiation direction. A directional loudspeaker 38 in front of the center of the vehicle radiates
directionally the left channel, the right channel, and the right surround channel so that the
direction toward the front right passenger position 20R is a low intensity radiation direction. The
right surround channel, the left surround channel, and the left channel are emitted in a
directional manner so that the direction toward the left center occupant position 21L is a low
intensity radiation direction. Furthermore, the directional loudspeakers 38 in front of the center
of the vehicle direct the left surround channel, the left channel, and the right surround channel
10-04-2019
19
so that the direction toward the occupant position 21R at the right center is a low intensity
radiation direction. Radiate. A directional loudspeaker 34R in front of the center of the right side
of the vehicle directionally radiates the right channel so that the direction toward the occupant
position 20R in front of the right is a low intensity radiation direction, and travels to the
occupant position 21R in the center right Directionally radiate the right surround channel so that
the direction is a low intensity radiation direction. A directional loudspeaker 36L at the rear of
the left center of the vehicle directionally radiates the left channel so that the occupant position
21L at the center of the left has a low intensity radiation direction, and an occupant position 22L
at the rear left has low intensity radiation Directionally radiate the left surround channel as
directed.
The directional loudspeaker 40 behind the center of the vehicle radiates the right channel, the
left channel, and the left surround channel in a directional manner so that the direction toward
the occupant position 21L in the left center is a low intensity radiation direction. The directional
loudspeaker 40 behind the center of the vehicle radiates the left channel, the right channel, and
the right surround channel in a directional manner so that the direction toward the occupant
position 21R in the center at the right is a low intensity radiation direction. The directional
loudspeaker 40 behind the center of the vehicle radiates directionally the right surround channel,
the left channel, and the left surround channel so that the direction toward the left rear occupant
position 22L is a low intensity radiation direction. . Furthermore, the directional loudspeakers 40
in the rear of the center of the vehicle direct the left surround channel, the right channel, and the
right surround channel so that the direction toward the rear right passenger position 22R is a
low intensity radiation direction. Radiate. A directional loudspeaker 36R at the rear of the center
of the right side of the vehicle directionally radiates the right channel so that the direction
toward the occupant position 21R at the center of the right is a low intensity radiation direction,
and proceeds toward the occupant position 22R at the rear right Directionally radiate the right
surround channel so that the direction is a low intensity radiation direction. The central rear
directional loudspeaker 26C radiates directionally the LS channel so that the direction toward the
left rear occupant position 22L is a low intensity radiation direction, and the direction toward the
right rear occupant position 22R is low Directionally radiate the RS channel so as to be in the
direction of intense radiation. If one or more directional loudspeakers of the rear directional
loudspeakers 26L, 26C, 26R are positioned such that the radiation is reflected at a reflective
surface such as a front window or a rear window, Although not shown in FIG. 3B, the directional
loudspeaker radiates directionally such that the direction towards the reflective surface is a low
intensity radiation direction. If center channel information in the music mode is present, the
center channel is mixed with both left and right channels as indicated by the bracketed display in
FIG. 3A. In this case, the directional loudspeaker 38 in front of the center of the vehicle radiates
the center channel directionally so that the direction toward the left front passenger position 20L
is a low intensity radiation direction, and the right front passenger The center channel is emitted
in a directional manner such that the direction toward the position 20R is a low intensity
10-04-2019
20
radiation direction.
The directional loudspeaker 40 behind the center of the vehicle radiates the center channel
directionally so that the direction toward the left center occupant position 21L is a low intensity
radiation direction, and the direction toward the right center occupant position 21R Radiates the
center channel in a direction such that the radiation direction is low. A directional loudspeaker
34L in front of the left central portion of the vehicle directionally radiates the center channel
such that the direction toward the left front occupant position 20L is a low-intensity radiation
direction. The directional loudspeaker 34R in front of the center of the right vehicle radiates the
center channel directionally such that the direction toward the occupant position 20R in front of
the right is a low-intensity radiation direction. The directional loudspeaker 36L behind the left
central part of the vehicle directionally radiates the center channel so that the direction toward
the occupant position 21L in the central left is a low-intensity radiation direction. A directional
loudspeaker 36R behind the right central portion of the vehicle directionally radiates the center
channel such that the direction toward the occupant position 21R at the central right is a lowintensity radiation direction.
[0046]
Other embodiments of the present invention may have other combinations of directional and
omnidirectional speakers, or may not include all of the components of FIG. 3A. For example, the
loudspeakers 34L, 34R, 36L, 36R may be directional loudspeakers as shown, and all the other
loudspeakers in FIG. 3A are replaced with conventional omni-directional loudspeakers. be able to.
Omnidirectional radiation is more effective than directional radiation. Because acoustic energy is
lost and does not lead to destructive interference. In the embodiment without the central rear
directional loudspeaker 26C, the left rear directional loudspeaker 26L has an LS channel so that
greater acoustic energy is emitted towards the occupant position 22R than the occupant position
22L. Can be configured to emit radiation. And, the rear directional loudspeaker 26R may be
configured to emit an RS channel such that more acoustic energy is emitted towards the
occupant position 22L than the occupant position 22R. This embodiment can be tolerated even if
the directions towards the occupant positions 22L and 22R are both high intensity radiation, as
long as the acoustic energy is not radiated to the occupant position closer than the far occupant
position. A difference of 3 dB or 4 dB is sufficient as an ideal result. With the radiation patterns
offset the rear loudspeakers 26L and 26R close to the rear seating positions 22L and 22R, the
occupants of the rear seating positions 22L and 22R can listen to the LS and RS channels
approximately equally. In configurations that do not have directional loudspeakers 38 in front of
the center of the vehicle or configurations in which directional loudspeakers 38 in front of the
center of the vehicle are not used to radiate surround channels, the directivity in front of the
10-04-2019
21
center of the left vehicle Loudspeaker 34L may be configured to emit the LS channel such that
greater acoustic energy is emitted towards occupant position 20R in front of the left front seat
position 20L. And, the directional loudspeaker 34R in front of the right central portion of the
vehicle may be configured such that larger acoustic energy is radiated toward the seat position
20L on the left front side than on the seat position 20R on the right front side. In addition, in a
configuration without the directional loudspeakers 40 behind the center of the vehicle or in a
configuration in which the directional loudspeakers 40 behind the center of the vehicle are not
used to radiate the surround channel, The directional loudspeaker 36L may be configured such
that more acoustic energy is emitted towards the right center seat position 21R than the left
center seat position 21L.
And the directional loudspeaker 36R behind the right center of the vehicle is configured to emit
an RS channel so that greater acoustic energy is emitted towards the left center seat position 20L
than the right center seat position 20R. It can be done. The directional loudspeaker 40 in front of
the center of the vehicle may be configured to radiate the LS channel and RS channel forward
and radiate the center channel rearward as in FIG. 3A.
[0047]
The audio system in FIGS. 3A and 3B has the following advantages. The point at which the sound
image at each occupant position is better balanced back and forth and left and right. It is possible
to reduce left and right surround channel radiation from the sound source to the right of each
occupant position and correspondingly reduce left and right surround channel emissions from
the sound source to the left of each occupant position. It is possible to reduce left and right
channel radiation from the sound source to the rear of each occupant position, and
correspondingly to reduce left and right surround channel radiation from the sound source to the
front of each occupant position. Reduce early reflections. The point that the sound fields for each
occupant position are very similar, as the equalization patterns do not have to be highly position
dependent.
[0048]
3C and 3D represent the audio system of FIGS. 3A and 3B operating in different modes, so-called
"movie mode". In FIGS. 3C and 3D, a video image (eg, a DVD video) is displayed on the screen of
the video display. In the arrangement of FIG. 3C, the left front directional loudspeaker 30L, the
center front directional loudspeaker 30R, and the right front directional loudspeaker 30R radiate
10-04-2019
22
nothing. When installed, center channel speakers 44LF, 44RF, 44LI, 44RI, 44LR, and 44RR are
similar. Alternatively, if one or more of the directional loudspeakers 30L, 30C, 30R and center
channel speakers 44LF, 44RF, 44LI, 44RI, 44LR, 44RR are provided, low frequency radiation
may be provided. It can radiate omnidirectionally or, if provided, center channel loudspeakers
44LF, 44RF, 44LI, 44RI, 44LR, 44RR. The directional loudspeaker 34L in front of the left central
part of the vehicle has a high intensity in the direction toward the right central occupant position
21R, and preferably more acoustic energy is on the right than the central left occupant position
21L. It radiates the left channel in a directional manner so as to be emitted toward the central
occupant position 21R. Both directions towards the central occupant positions 21L and 21R can
both be high-intensity radiation directions as long as the acoustic energy is emitted towards the
occupant position closer than the far occupant positions, or both Desirable. A difference of 3 dB
or 4 dB is sufficient as an ideal result. By offsetting the rear loudspeaker 34L close to the central
seating position 21L, the radiation pattern allows the occupants of the central seating positions
21L and 21R to hear the L channel radiation substantially equally. The directional loudspeaker
38 in front of the center of the vehicle has a high intensity radiation direction toward the central
occupant positions 21L and 21R and a high intensity radiation direction toward the rear
occupant positions 22L and 22R. It radiates the center channel as directed. Alternatively or
additionally, the directional loudspeakers 38 in front of the center of the vehicle are directed
towards the video display 42 with high intensity radiation, so that the radiation of the center
channel is video as shown in FIG. 3C. The center channel can be directed radiated as reflected by
the display 42 and as the sound source of the center channel appears on the display.
Alternatively, the center channel can be emitted by utilizing the technology disclosed in US Pat.
The directional loudspeaker 34R in front of the right central part of the vehicle has a highintensity radiation direction toward the central occupant position 21L in the left central part, and
as indicated by the arrows, preferably larger acoustic energy is in the right central part The right
channel is radiated in a directional manner so as to be emitted toward the left center occupant
position 21L rather than the occupant position 21R. Both directions towards the central
occupant position 21L, 21R can both be high intensity radiation directions, or only desirable, as
long as the acoustic energy is not radiated towards the occupant position closer than the far
occupant position. . A difference of 3 dB or 4 dB is sufficient as an ideal complement. By
offsetting the rear loudspeakers 34R close to the central seating position 21R, the occupants of
the central occupant positions 21L and 21R can hear the emissions of the R channel
approximately equally by offsetting the radiation pattern towards the central seating position
21R. A directional loudspeaker 36L at the rear of the left center of the vehicle directionally
radiates the left surround channel so that the direction toward the occupant position 21L at the
left center is a high-intensity radiation direction, and the occupant position 22L at the left rear
Directionally radiates the left channel so that the direction toward it is a high intensity radiation
direction. The directional loudspeaker 40 behind the center of the vehicle radiates the right
surround channel in a directional manner such that the direction toward the left center occupant
10-04-2019
23
position 21L is a high-intensity radiation direction. The directional loudspeaker 40 behind the
center of the vehicle radiates the left surround channel in a directional manner such that the
direction toward the occupant position 21R in the center of the right is a high intensity radiation
direction. The directional loudspeaker 40 behind the center of the vehicle radiates the right
channel directionally such that the direction toward the left rear occupant position 22L is a high
intensity radiation direction. Then, the directional loudspeaker 40 at the rear of the center of the
vehicle radiates the left channel directionally so that the direction toward the occupant position
22R at the rear right is the high-intensity radiation direction. A directional loudspeaker behind
the center of the vehicle may also radiate the center channel. A directional loudspeaker 36R at
the rear of the center of the right vehicle directionally radiates the right channel so that the
direction toward the occupant position 22R at the rear right is a high intensity radiation
direction, and proceeds to the occupant position 21R at the right center Directionally radiate the
right surround channel so that the direction is a high intensity radiation direction.
The left rear directional loudspeaker 26L radiates directionally the left surround channel such
that the direction toward the left rear occupant position 22L is a high intensity radiation
direction. The central rear directional loudspeaker 26R directivityally radiates the right surround
channel so that the direction toward the left rear occupant position 22L is a high intensity
radiation direction, and the direction toward the right rear occupant position 22R is Directionally
radiates the left surround channel so that the radiation direction is high intensity. The right rear
directional loudspeaker 26R directivityally radiates the right surround channel such that the
direction toward the rear right passenger position 22R is a high intensity radiation direction.
[0049]
FIG. 3D represents the low intensity radiation direction in an audio system operating in the mode
shown in FIG. 3C. The directional loudspeaker 34L toward the center of the left vehicle
directionally radiates the left channel such that the direction toward the front of the passenger
compartment of the vehicle is a low-intensity radiation direction. A directional loudspeaker 38 in
front of the center of the vehicle directivityally radiates the center channel such that the direction
toward the front seat positions 20L and 20R is a low-intensity radiation direction. The directional
loudspeaker 34R in front of the center of the right vehicle radiates the right channel directionally
so that the forward direction of the passenger compartment is a low intensity radiation direction.
A directional loudspeaker 36L behind the left central part of the vehicle directionally radiates the
left channel so that the direction toward the central occupant position 21L is a low-intensity
radiation direction, and is directed to the left rear occupant position 22L Directionally radiate the
left surround channel so that the direction is a low intensity radiation direction. The directional
loudspeaker 40 behind the center of the vehicle radiates the right channel, the left channel, and
10-04-2019
24
the left surround channel in a directional manner so that the direction toward the occupant
position 21L at the left center is a low intensity radiation direction. The directional loudspeaker
40 behind the center of the vehicle radiates the left channel, the right channel, and the right
surround channel in a directional manner so that the direction toward the occupant position 21R
in the center at the right is a low intensity radiation direction. The directional loudspeaker 40
behind the center of the vehicle radiates directionally the left channel, the left surround channel,
and the right surround channel so that the direction toward the left rear occupant position 22L is
a low intensity radiation direction. . Then, the directional loudspeaker 40 behind the center of the
vehicle directivityally directs the right channel, the left surround channel, and the right surround
channel so that the direction toward the occupant position 22R at the rear right is a low intensity
radiation direction. Radiate. A directional loudspeaker 36R behind the center of the right side of
the vehicle radiates the right channel directionally so that the direction toward the occupant
position 21R at the center of the right is a low intensity radiation direction, and the occupant
position 22R to the rear right Directionally radiate the right surround channel so that the
heading direction is a low intensity radiation direction. When one or more directional speakers of
the rear directional loudspeakers 26L, 26C, 26R are provided in the vicinity of the reflective
surface, the directional loudspeakers are directed in the direction toward the reflective surface
(not shown). It can be emitted directionally to be a low intensity radiation direction.
In the case of the music mode, in the embodiment without the central rear directional
loudspeaker 26C, the left rear directional loudspeaker 26L is used for the left rear passenger
position 22L in order to achieve better sound balance. The direction toward is the low intensity
radiation direction, and the direction toward the right rear passenger position 22R is the high
intensity radiation direction, and further, the right rear directional loudspeaker 26R However, the
direction toward the right rear occupant position 22R may be configured as a low intensity
radiation direction, and the direction toward the left rear occupant position 22L may be
configured as a high intensity radiation direction.
[0050]
An audio system operating as in FIGS. 3C and 3D has some of the same advantages as the audio
system in FIGS. 3A and 3B. The radiation of the left and right channels from the sound source
toward each occupant position is reduced, and the radiation of the left and right surround
channels from the sound source toward the front of each occupant position is correspondingly
reduced. This improves the balance of the front and back sounds. In "video mode", the directional
radiation pattern offsets the central occupant position closer to the directional loudspeaker,
resulting in an improved balance of left and right sound at the central occupant position. Because
the early reflections are reduced, the frequency response is improved. Additionally, an audio
10-04-2019
25
system operating as in FIGS. 3C and 3D can actually locate the center channel's virtual point
source (apparent source). As a result, when watching a video, it is felt that the virtual point sound
source of the center channel is in the video image. Still further, the occupants of the central
occupant position and the rear occupant positions can enjoy the audio portion of the video with
relatively high sound without disturbing or distracting the driver or the occupants of the front
seat. It is not necessary to implement all of the directional loudspeakers shown in FIGS. 3A-3D in
order to obtain better performance than conventional vehicle audio systems.
[0051]
The delays as described above in the description of FIG. 2D can also be utilized in implementing
the audio system shown in FIGS. 3A-3D to provide radiation patterns that perform locally better.
[0052]
The audio system may have the ability to operate in both the modes illustrated in FIGS. 3A and
3B and the modes illustrated in FIGS. 3C and 3D.
Furthermore, the audio system may have circuitry for selecting among the available operating
modes. The circuit device may be a manual device, such as a switch, for example, whether the
media to be executed has video information or not, and the video information automatically
selecting the mode shown in FIGS. 3C and 3D It may be an automatic device that includes
circuitry for sensing whether it is present.
[0053]
2A-2D and 3A-3D illustrate directional loudspeakers operating in a horizontal plane. Actual
embodiments may have components that operate similarly in the vertical plane. For example, if
directional loudspeakers are mounted on the ceiling, the radiation and radiation patterns are
directed downwards and preferably laterally.
[0054]
FIG. 4 represents another directional loudspeaker mounted in, near, or on the seatback of the
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26
vehicle. In the arrangement of FIG. 4, the direction toward the occupant 46 of the driver's seat
20L is a high-intensity radial direction, and the direction of separating the driver's seat from the
occupant is a low-intensity radial direction. An audio signal from an auxiliary sound source, such
as a "hands-free" radiotelephone (mobile phone) is emitted in a directional manner. The audio
system cooperating with the elements shown in FIG. 4 is a circuit which causes the directional
loudspeaker 44LI to radiate the audio signal in a directional manner as described above, and
acoustic if the signal from the auxiliary sound source is not sent. Also includes a circuit that
causes the surround channel S to radiate directionally so that the direction toward the driver is a
high intensity radiation direction and the direction away from the occupant 46 of the driver's
seat 20L is a low intensity radiation direction. There is.
[0055]
FIG. 5 represents an audio system with directional loudspeakers (in this case a two-element
directional array) mounted in the rear door. In the directional loudspeaker 24, the direction
toward the head 522 of the rear occupant position 22 is high in intensity, and the direction
toward the head 520 of the occupant in the front seat occupant position 20 is low in radial
direction It radiates the left channel directionally as it is said. The directional loudspeaker 24 has
a low strength toward the head 522 of the rear passenger position 22 and a high strength
toward the head 520 of the passenger at the front seat passenger position 20. It radiates the left
surround channel directionally, as it is directed in the radial direction. The occupant at the front
passenger position 20 listens to the left surround channel from the sound source behind the
front passenger position. Then, the passenger in the rear seat position 22 hears the left channel
from the sound source in front of the rear seat position 22. The directional loudspeakers 24 may
be mounted higher in the door than conventional loudspeakers (e.g., on the top surface 50 of the
door panel). This results in improved acoustic performance. In the conventional loudspeaker,
when the loudspeaker emits information in the left channel, the occupant in the front seat has
the sound source in the left channel forward because the conventional loudspeaker is not so
close to the occupant in the front seat It is generally mounted low inside the door so that it feels
behind.
[0056]
As described above in FIG. 2D, delays are used to provide directional cues generated by
directional loudspeakers.
[0057]
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27
FIG. 6A represents a vehicle passenger compartment with an audio system similar to FIG. 2C.
The arrangement in FIG. 6A includes sensing circuitry 52 in addition to the elements of FIG. 2C
to sense whether an occupant is present at seat locations 20 and 22. The sensing circuit 52 is
realized by, for example, a weight sensor in a seat or an arbitrary sensor.
[0058]
With the occupant at both seat positions 20 and 22, the audio system in FIG. 6A operates in the
same manner as the audio system in FIG. 2C. In FIG. 6B, the audio system behaves differently
with no occupant at the rear occupant position 22. For example, the rear directional loudspeaker
26 can emit nothing, radiate the left surround channel in an omnidirectional or omnidirectional
manner, or radiate non-directionally low frequencies as shown. It is not necessary to radiate the
left surround channel directionally from the directional loudspeaker 24 in the middle of the
vehicle so that the direction towards the rear passenger position 22 is a low intensity radiation
direction. Instead, the directional loudspeaker 24 at the center of the vehicle radiates a left
surround signal omnidirectionally as illustrated by the semicircular polar plot line 54, and the
directional loudspeaker 26 at the rear is left surround When the channel is emitted, nothing is
emitted or only low frequencies can be emitted. Omnidirectional radiation is more effective than
directional radiation. The invention can also utilize other forms of vehicle or occupant condition,
as well as an improved method of operating a directional loudspeaker. For example, the height of
the occupant can be sensed and the vertical radiation adjusted. It also senses whether the
window is open or closed, or the convertible vehicle's roof is open or closed, and whether a
reflective or absorbing surface is provided for the directional characteristics of the directional
loudspeaker You can make adjustments according to the In addition, it has other functions. In
general, the directivity of a directional loudspeaker varies depending on the sensed state of the
vehicle. In the situation described above, the signal applied to the directional loudspeaker is
delayed such that the aforementioned effect provides a magnitude cue to enhance the sound
image.
[0059]
FIG. 7 shows a part of the vehicle passenger compartment 18. A microphone 56 for use with a
hands-free wireless telephone and / or a vehicle noise compensation system, for example, is
mounted at a convenient location, such as inside a dashboard as shown. The directional
10-04-2019
28
loudspeaker 30L is mounted near the microphone (in this embodiment, inside the front door).
The directional loudspeaker 30L has an audio channel (eg, the left channel of the surround sound
system or stereo system) so that the direction toward the occupant position (eg, the driver
position 20L) is a high-intensity radiation direction. It is considered to be configured and
arranged to radiate in a directional manner. Furthermore, the directional loudspeaker 30L is
configured and arranged to radiate directionally so that the direction toward the microphone 56
is a low intensity radiation direction. By making the direction towards the microphone a low
intensity radiation direction, the vehicle noise compensation system can read out ambient noise
more accurately. Moreover, the quality of the communication is improved and the opportunity to
hear back is reduced by the fact that acoustic energy is hardly directed at the microphones used
for communication via the wireless telephone. The arrangement shown in FIG. 7 is such that the
microphone preferentially picks up sound from several directions (hereinafter referred to as the
high detection direction), such as the driver's seat position indicated by the arrow 64, or It can be
used with directional microphones such that the direction from the vicinity of the loudspeaker,
such as loudspeaker 30L, towards the microphone is a low detection direction as indicated by
arrow 62.
[0060]
The various uses of the specific apparatus and method disclosed in the claims, and the
improvements from the apparatus and method do not deviate from the technical concept of the
present invention. As a result, the present invention is configured including the novelty disclosed
in the claims and each combination of the novelty, and is not limited only by the technical spirit
and technical scope of the present invention. .
[0061]
The example of the polar coordinate of a directional loudspeaker is shown. It is the schematic in
a part of vehicle inside. It is the schematic in a part of vehicle inside. It is the schematic in a part
of vehicle inside. It is the schematic in a part of vehicle inside. 1 is a schematic view of the inside
of a vehicle. 1 is a schematic view of the inside of a vehicle. 1 is a schematic view of the inside of
a vehicle. 1 is a schematic view of the inside of a vehicle. It is the schematic in a part of vehicle
inside. It is the schematic in a part of vehicle inside. It is the schematic in a part of vehicle inside.
It is the schematic in a part of vehicle inside. It is the schematic in a part of vehicle inside.
Explanation of sign
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[0062]
10 Polar Coordinates 12 Polar Coordinates 18 Inside Vehicle 20 Front Seat Occupant Position 20
L Left Front Occupant Position 20 R Right Front Occupant Position 21 L Left Central Occupant
Position 21 R Right Center Occupant Position 22 Rear Seat Occupant Position 22 L Left Rear
Occupant Position 22 R Right Rear Crew position 26L Left rear directional loudspeaker 26R
Right rear directional loudspeaker 26C Center rear directional loudspeaker 30L Left front
directional loudspeaker 30R Right front directional loudspeaker 30C Center front directional
loudness Loudspeakers 32 Front window 34L Left directional directional loudspeaker 34R in
front of the vehicle center Forward directional directional loudspeaker 36L in the front of the
right vehicle center Forward directional loudspeaker in the rear of the left vehicle center 36R
Forward directional loudspeaker behind the right vehicle central portion 38 Vehicle Center Front
Directional Loudspeakers 40 Vehicle Center Back Directional Loudspeakers 42 Video Display
44LF Center Channel Speakers 44RF Center Channel Speakers 44LI Center Channel Speakers
44RI Center Channel Speakers 44LR Center Channel Speakers 44RR Center Channel Speakers 46
Passenger 50 Door panel upper surface 52 sensing circuit 56 microphone 520 head 522 head
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