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DESCRIPTION JPH10112895

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DESCRIPTION JPH10112895
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vehicle with a luggage compartment provided with a rear speaker, and a device for obtaining a
good sound from the rear loudspeaker even when a load or the like is placed in the luggage
compartment.
[0002]
[Background Art] Recently, many wagons are used for leisure, family, etc. However, these wagons
have a luggage compartment at the back of the driver's seat, and they can be folded when people
sit. To be able to sit in the part that is the loading space. In the case of a vehicle with a luggage
compartment such as a wagon, the front driver's seat and the rear luggage compartment are
usually not separated, and the driver's seat and the luggage compartment are integrated. In such
a driver's seat loading room integrated type vehicle, a car audio player's rear speaker is provided
at a part of the loading room as shown in FIG. 1 (a).
[0003]
SUMMARY OF THE INVENTION In the case of the above-mentioned driver's seat loading room
integrated type vehicle, the rear speakers are often embedded in the side wall or the rear wall of
the loading room. In that case, if nothing is placed in the luggage compartment, the sound from
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the speaker will reach the listener's ears such as the driver in front of the vehicle in a good
condition. However, when the luggage is placed in the luggage compartment, the luggage may be
placed so as to cover the front of the speaker, or a part of the front of the speaker may be
covered by the luggage (FIG. 1 (b)) , (C)). Also, even if the speakers are not immediately covered
by the luggage, the luggage may be placed between the listener and the speakers in front of
them. Furthermore, a seat may be extended to a part of the luggage compartment and a person
may sit.
[0004]
As described above, when the luggage is placed so as to cover the front of the speaker or when
there is a person, the flow of air on the front of the speaker is blocked and the diaphragm
becomes difficult to move, as shown in FIG. As a result, the frequency characteristic is degraded
as compared with the case where there is no package. In addition, when luggage or a person is
present between the speaker and the listener, it is difficult for the sound from the speaker to
reach the listener's ear and good listening can not be performed.
[0005]
Therefore, the present invention automatically corrects the sound field in the vehicle
compartment so that a good sound is always transmitted from the rear speaker to the listener's
ear, even when luggage or the like is placed in the luggage compartment in a vehicle with a
luggage compartment, The purpose is to create a good car interior sound field. Another object of
the present invention is to provide various kinds of luggage detection devices capable of
detecting that a luggage or the like has been placed in the luggage compartment and
automatically correcting the sound field in the vehicle compartment by the detection output.
[0006]
SUMMARY OF THE INVENTION The present invention relates to a vehicle equipped with a
luggage compartment, such as a front of a linear loudspeaker in the luggage compartment, a
good sound, such as between a passenger and a speaker who is a listener such as a driver who is
in front of the vehicle. Detects that a package has been placed at a position that interferes with
the listening of a person, or that a person is present, controls the directivity variable device
according to the detection result, and / or controls the sound quality adjuster, Even when the
speaker is placed, a good sound is transmitted to the listener's ear at the front of the vehicle.
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[0007]
Therefore, in the present invention, when the luggage is placed in the cargo compartment, it is
detected, or when it is detected that there is a person, the directivity variable device provided on
the front of the speaker is controlled, and the sound from the speaker is in front of the vehicle. It
is intended to be well transmitted to the driver's ear etc. in the club.
Also, according to the present invention, when the package is placed in the cargo compartment,
this is detected, or when it is detected that a person is present, the sound quality adjuster is
controlled to raise the overall sound pressure level or the sound of a specific frequency band. The
pressure level is raised so that the sound from the speaker can be well transmitted to the driver's
ear or the like at the front of the vehicle.
[0008]
Further, in the present invention, when the luggage is placed in the cargo compartment, it is
detected, or when it is detected that a person is present, the directivity variable device provided
on the front of the speaker is controlled and the sound quality adjuster is controlled. The sound
pressure level of the whole sound pressure level is raised or the sound pressure level of a specific
frequency band is raised so that the sound from the speaker can be well transmitted to the ear of
the driver or the like at the front of the vehicle.
[0009]
Furthermore, in the present invention, in order to detect that a load has been placed in the part
of the cargo compartment or the presence of a person, detection is performed using various
sensors.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 2 shows that when a load or
the like is placed in the cargo compartment, the directional variable device is used to correct the
sound field in the vehicle compartment, and the sound from the speaker is at the front of the
vehicle. The apparatus which made it transmit well to the driver | operator's etc. ear which are
present is shown.
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In this device, when the package detection device 1 detects that a package or the like has been
placed, the output is input to the controller 2 and the controller 2 outputs the sound from the
speaker 4 to the front of the vehicle according to the detected output. The directivity changer 3
is controlled so as to be well transmitted to the driver's ear or the like.
The directivity variable device 3 is provided at the opening of the front of the speaker 4 as shown
in FIG.
[0011]
An acoustic lens is generally known as a method of controlling the directivity of a speaker
system. The function of the acoustic lens is to arrange the acoustic lens in the sound wave
passage in front of the speaker, thereby lengthening the path length of the sound wave to
equivalently lower the sound velocity and change the refractive index. Attached to the opening in
order to broaden the directivity of the.
[0012]
FIG. 3 shows the configuration of the directivity variable device 3. FIG. 3 (a) is a threedimensional view, and FIG. 3 (b) is a plan view. The directivity variable device shown in FIGS. 3
(a) and 3 (b) is, for example, "optimal design method of speaker and its sound quality evaluation
simulation" (Mitsubishi Electric Corp., Shigeru Morita, Technical Information Center Co., Ltd.) The
acoustic lens 32 described in the item of “AV speaker” in the publication), and this acoustic
lens 32 has a configuration in which fins whose widths sequentially change are inclined and
disposed in the vertical direction, The directivity in the opposite direction to the inclined
direction of the fins is made broad. The acoustic lens 32 is disposed on the front of the opening
grille 31 of the speaker box 30 provided with the speakers 4. In the present invention, the
acoustic lens 32 is provided slidably on the slide rail 33 as shown in FIG. 3B, and when the
luggage detection device 1 detects that a luggage or the like has been placed, The controller 2
slides the directional variable device 3 provided with the acoustic lens 32 on the slide rail to the
front of the opening grille 31 of the speaker 4. In addition, by controlling the acoustic lens 32,
the sound from the speaker 4 can be well transmitted to the driver's ear or the like at the front of
the vehicle while avoiding the luggage or the like present on the front and facing the listener. Do.
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[0013]
By controlling the directivity variable device 3 in this manner, as shown by the thick solid line in
the graph of FIG. It is improved compared to the case where it was not. FIG. 4 shows another
embodiment of the directivity variable device 3. In this embodiment, the acoustic lens has a
lateral fin arrangement as shown in FIGS. 4 (a) and 4 (b). is there. The acoustic lens 32 shown in
FIG. 4 (a) is an "AV speaker" of "the optimum design method of the speaker and its sound quality
evaluation simulation" (Mitsubishi Electric Co., Ltd., Shigeru Morita, published by Technology
Information Center). As described in the paragraph, the fins whose width is asymmetrical are
arranged in the lateral direction by being inclined downward and are arranged in front of the
opening grille 31 of the speaker box 30. In this method, the directivity in the direction in which
the width of the fin is wide becomes broad, and the directivity in the direction in which the width
is narrow becomes substantially the same as the characteristics when there is no acoustic lens.
[0014]
The acoustic lens 32 shown in FIG. 4 (b) also has a lateral fin arrangement, with the centrally cut
notch fins inclined laterally down. In this method, the width of the fins on both sides of the notch
is wide, and the directivity in the left and right directions is broad. The acoustic lens 32 of the
directivity variable device shown in FIGS. 4 (a) and 4 (b) is configured such that the inclination
angle of the fins is controlled by the controller 2 when in use, and FIG. It can be folded as shown
in). 4 (d) is a plan view of FIGS. 4 (b) and 4 (c).
[0015]
FIG. 5 is another embodiment of the directivity variable device, which is a directivity variable
device shown in Japanese Utility Model Application Publication No. 63-35394, which is made up
of a plurality of definers that give directivity to the sound from the speaker. 5 (a) is its front view.
The directivity variable device can be rotated as a whole as shown in FIG. 5B, and can have
directivity in any direction. Further, as shown in FIG. 5C, the fins 35 of the definer can be moved
laterally.
[0016]
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In addition, although the acoustic lens 32 shown by FIG.3 and FIG.4 can also move a fin left and
right, you may comprise it so that it can also rotate this. In FIG. 6, when a luggage etc. is placed
in the part of the cargo room, the sound field in the car room is corrected using the sound quality
adjuster, and the sound from the speaker is good for the driver's ear etc. at the front of the car
Shows a device that is intended to be transmitted to In the apparatus shown in FIG. 6 (a), when
the package detection device 1 detects that a package or the like is placed, its output is input to
the controller 2, and the controller 2 controls the sound quality according to the detected output.
6 is controlled to adjust the sound quality adjuster 6 so that the sound from the speaker 4 can be
well transmitted to the driver's ear or the like at the front of the vehicle. The sound quality
adjuster 6 is connected between the sound source and the speaker, and receives a control signal
from the controller 2 to process the signal from the sound source. For example, correction to the
sound source by raising the sound pressure level to the whole, raising the high sound pressure
level by the equalizer, raising the low sound pressure level, and raising the sound pressure level
of other necessary bands To correct the sound field. Also, in some cases, sound pressure levels in
specific bands may be attenuated. FIG. 6 (b) shows the improved frequency characteristics when
adjusted by the tone controller 6.
[0017]
The controller may control the directivity variable device and / or the sound quality adjuster by
an automatic controller according to the detection result of the package detection device. Having
described the directivity variable device and the sound quality adjuster for correcting the sound
field in the vehicle, the luggage detection device will be described next. FIG. 7 shows a package
detection device using a load sensor. As shown in FIG. 7A, the load sensor 11 is provided on the
floor in front of the speaker 4 provided in the luggage compartment, and a load or the like is
detected on the front surface of the speaker 4 when a load or the like is placed. The load sensor
11 may be provided not only in front of the speaker 4 but also on the entire floor of the luggage
compartment, as shown in FIG. It is also possible to divide the floor of the cargo compartment
into a plurality of sections, provide load sensors in each section, and control the directivity
changer or the sound quality adjuster depending on which part of the sensor has worked.
[0018]
FIG. 8 shows a package detection device using, for example, an infrared sensor as an objective
non-contact sensor. As shown in FIG. 8, the infrared sensor 12 is disposed in the vicinity of the
speaker 4 to detect a load when placed near this. Although the infrared sensor 12 is provided in
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the vicinity of the speaker 4 in FIG. 8, the infrared sensor 12 may be provided at any place where
it can detect that a load is placed, such as the side of a luggage compartment, a ceiling, or a floor.
And a sound field can also be corrected according to which position the infrared sensor provided
in detected the package.
[0019]
FIG. 9 shows an apparatus for detecting whether a package has been placed by detecting the
movement of the diaphragm of the speaker. When a load is placed on the front of the speaker 4,
the air flow on the front of the speaker 4 is impeded, so the air load (acoustic load) when the
diaphragm of the speaker moves increases and the diaphragm becomes difficult to move. This
tendency is remarkable especially at low temperatures. Therefore, a sensor for detecting changes
in the acoustic load of the speaker, such as a sound pressure detection microphone, a
displacement detection sensor for a diaphragm, or an acceleration detection sensor, is provided,
and the presence or absence of luggage is determined by comparing the output of the sensor
with the output of a sound source. It is something to judge. In FIG. 9, the signal output from the
sound source 13 is amplified by the amplifier 14 and converted to sound by the speaker 4. In the
present invention, a sound pressure microphone is provided above the voice coil of the speaker
4, or a displacement detection sensor or an acceleration detection sensor is provided on the
diaphragm of the speaker to form a sensor 15 for detecting a change in acoustic load. The output
from the sound source 13 is input to the other input terminal of the comparator 17 via the
coefficient setting unit 16 and the both are compared and the result is output. Then, when there
is no package, the coefficient of the coefficient setting unit 16 is set so that the output of the
comparator 17 becomes zero. For example, when a package is placed on the front of the speaker
4 as shown in the figure, the air flow on the front of the speaker is blocked, the acoustic load
changes, and the diaphragm becomes difficult to move, so the output from the sensor 15
decreases. Then, a difference occurs in the input to the comparator 17, and the comparator 17
generates an output to detect that a package or the like is placed. Even if the place where
luggage is placed is not the front of the speaker, the acoustic load changes and the sound
pressure of the speaker or the movement of the diaphragm changes, so the sensor detects this
and compares the output according to the change of the acoustic load The comparator 17
generates an output according to the output of the sensor.
[0020]
Although the output signal of the sound source 13 is input to the comparator 17 in the above
description, the output signal of the amplifier 14 may be input to the comparator 17 as shown by
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a dotted line in the figure. In that case, the coefficient of the coefficient setting unit 16 is
changed. FIG. 10 shows a luggage detection apparatus configured to detect the presence or
absence of a luggage by detecting the opening and closing of the blind cover of the luggage
compartment with a sensor. In the case of a vehicle with a luggage compartment, many vehicles
have, for example, a roll-up cover as a blind cover in order to cover what is placed in the luggage
compartment. This cover is usually rolled up when there is no load, but when the load is inserted,
the cover is often expanded to cover up the load. In FIG. 10, reference numeral 18 denotes a
take-up cover, which is expanded when a load is placed in the luggage compartment. 4はスピー
カである。 A sensor 19 detects the expansion of the cover 18 and generates an output.
[0021]
FIG. 11 shows a luggage detection device that detects that a person has got in the luggage
compartment by detecting that the auxiliary sheet has been spread. Some vehicles in recent years
are equipped with an auxiliary seat that can be installed in the cargo compartment. This auxiliary
seat is usually stored under the floor, but when the number of passengers increases, it is
assembled on the floor so that people can sit. In this case, if a person sits in front of the speaker,
listening to a good sound is naturally blocked. Therefore, in FIG. 11, when the person gets in the
loading space, the auxiliary sheet 20 can be expanded, and this is detected by the state detection
sensor 21 of the auxiliary sheet.
[0022]
As described above, according to the present invention, it is detected whether a load or the like is
placed in a loading space or a person is seated using various load detection devices, and the
directivity variable device and / or the sound quality adjustment device according to the
detection output. Is used to control the sound and to correct the sound field in the passenger
compartment.
[0023]
According to the present invention, in a vehicle with a luggage compartment, a good sound can
be obtained, for example, between an occupant who is a listener such as a driver in front of the
loudspeaker in the luggage compartment and a front seat of the vehicle It detects that a package
has been placed at a position that interferes with listening, or that a person has been present, and
automatically corrects the sound field in the vehicle compartment, so even if the package is
placed in the luggage compartment, the listener is good You can hear a good sound.
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[0024]
In addition, since the directivity variable device and / or the sound quality adjuster are controlled
as means of sound field correction, the sound field is corrected by two different means of
directivity control and sound quality control of the sound source. So you can make fine
adjustments.
Furthermore, because multiple package detection devices are provided, they can be selected or
combined among them depending on their price and needs.
[0025]
Brief description of the drawings
[0026]
1 is a diagram showing a conventional luggage compartment vehicle equipped with a rear
speaker in the luggage compartment.
[0027]
2 is a block diagram of a vehicle interior sound field correction device equipped with a directivity
variable device according to the present invention.
[0028]
FIG. 3 is a graph showing an example of the directivity variable device and a degree of
improvement by a vehicle interior sound field correction device using the same.
[0029]
4 is a diagram showing another embodiment of the directional variable.
[0030]
5 is a diagram showing still another embodiment of the directivity variable.
[0031]
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FIG. 6 is a block diagram of a sound correction system provided with a sound quality adjustment
device according to the present invention and a graph showing the degree of improvement by
the sound correction system obtained using the sound correction system.
[0032]
7 is a diagram showing a load detection device using a load sensor.
[0033]
<Figure 8> It is the figure which shows the load detection device which uses the infrared ray
sensor as the object non-contact sensor.
[0034]
<Figure 9> It is the figure which shows the load detection device which uses the sensor which
detects the change of acoustic load.
[0035]
<Figure 10> It is the figure which shows the load detection device which uses the opening and
closing detection sensor of blind cover such as winding type cover and the like.
[0036]
<Figure 11> It is the figure which shows the load detection device which uses the state detection
sensor of the load seat auxiliary seat.
[0037]
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 ... luggage | load detection apparatus 2 ... Controller 3 ... Directivity
variable device 4 ... Speaker 5 ... Sound source 6 ... Sound quality adjuster 11 ... Load sensor 12 ...
Infrared sensor 13 ... Sound source 14 ... Amplifier 15 ... Acoustic load sensor 16 ... Coefficient
setting device 17 ... Comparator 18 ... Blindfold cover 19 ... Blind cover opening / closing
detection sensor 20 ... Auxiliary sheet 21 ... Auxiliary sheet state detection sensor 30 ... Speaker
box 31 ... Opening grille 32 ... Acoustic lens 33 ... Slide rail 34 ... Difizer 35 ... Fins 35
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