close

Вход

Забыли?

вход по аккаунту

?

JP2015043618

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2015043618
A small-sized speaker array device in which a plurality of virtual speakers are formed in a
horizontal direction and a ceiling direction, respectively. A speaker array device (1) includes a
second speaker array (20) having a plurality of speaker units arranged side by side in a second
horizontal direction. When the speaker array device 1 is installed in the room 1000, the plurality
of speaker units are provided in the housing so that the front faces the ceiling 1001. The sound
beam output from the second speaker array 20 is a sound capable of adjusting the angle formed
between the pointing direction and the second horizontal direction, and is a sound that freely
radiates in the first horizontal direction Z. is there. Among the sound beams, the component B2y
that freely radiates is reflected by the ceiling 1001 to reach the sound receiving point Q1, and a
virtual speaker is formed in the direction of the ceiling. [Selected figure] Figure 6
Speaker array device
[0001]
The present invention relates to technology for reflecting sound using a speaker array to reach a
sound receiving point.
[0002]
There is a method of reflecting the sound of the surround channel on a wall surface to reach the
sound receiving point by utilizing the phenomenon that the sound output from the speaker array
in which a plurality of speaker units are regularly arranged shows directivity like a beam.
03-05-2019
1
For example, Patent Document 1 discloses a technology in which sounds of surround channels on
the left and right are reflected on a wall surface from a speaker array installed in front of a sound
receiving point to reach the sound receiving point. Thereby, a virtual speaker (virtual speaker) is
formed in the direction of the wall surface which is on the left and right of the sound receiving
point.
[0003]
Unexamined-Japanese-Patent No. 2004-363695
[0004]
By the way, with the recent enlargement of the television, the position where the speaker array
device for outputting the sound of the television is arranged and the position where the image
representing the sound source is displayed in the screen of the television are separated. ,
Listeners are more likely to feel uncomfortable.
When these positions are separated in the horizontal direction, the sense of incongruity can be
reduced by forming virtual speakers in the direction of the left and right wall surfaces of the
listener by the above-described speaker array. And when these positions are separated in the
perpendicular direction, for example, when the position of the above-mentioned sound source is
vertically higher than the position of the speaker array device, a virtual speaker in the direction
of the ceiling seen from the listener Can be reduced. The formation of the virtual speakers in the
direction of the ceiling may be realized by a speaker array comprising speaker units aligned in
the vertical direction. However, since the directivity angle of the output sound can not be
controlled in the horizontal direction by only one row of speaker units arranged in the vertical
direction, it is difficult to express the difference in the position where the virtual speakers of the
left and right surround channels are formed. In order to express this difference, it is necessary to
add a plurality of speaker units in the vertical direction and arrange them in the horizontal
direction as well, to form a so-called panel-type two-dimensional speaker array. Then, the speaker
array device becomes large, and a large space is required to install it. The present invention has
been made in view of such circumstances, and one of its purposes is to realize a small speaker
array device in which a plurality of virtual speakers are formed in the horizontal direction and
the ceiling direction, respectively.
[0005]
03-05-2019
2
In order to solve the above-mentioned subject, the present invention has a plurality of 1st
speaker units arranged side by side in the 1st field, points to a specific 1st directivity direction,
and the 1st above-mentioned plurality of 1st speakers A first speaker array for outputting, from
the plurality of first speaker units, a first sound capable of adjusting the angle of the first
pointing direction with respect to the arrangement direction in which the units are arranged; and
a first different from the first surface A second speaker disposed in two planes, the second
speaker outputting a second sound directed to a specific second directivity direction, the second
speaker including a ceiling as a sound reflection surface; The second sound with respect to the
sound receiving point which is in the normal direction of the first surface and is set as the
position for listening to the first sound when installed in the room where the first speaker array
is installed. Through reflection or diffraction from the second speaker The sound receiving point
at a volume at which the sound pressure ratio of the second sound reflected by the ceiling with
respect to the second sound directly reaching the sound receiving point is equal to or higher than
a predetermined value. The speaker array device is characterized in that the normal of the
second surface is placed along the reaching direction.
[0006]
In a preferred aspect, the second speaker outputs the supplied audio signal as the second sound,
and the length of the path of the second sound from the second speaker to the sound receiving
point, and the first speaker array And a delay means for delaying the audio signal according to a
difference between the first sound path and the length of the first sound path from the sound
reception point to the sound reception point, and the first speaker array includes the audio signal
delayed by the delay means. Output as the first sound.
In another preferred embodiment, the audio signal includes attenuation means for attenuating a
frequency band equal to or less than a predetermined boundary frequency among frequency
bands of sound represented by the audio signal, and the second speaker is attenuated by the
attenuation means. The audio signal is output as the second sound, and the first speaker array
attenuates the audio signal in the frequency band lower than the boundary frequency among the
frequency bands of the sound represented by the audio signal by the attenuation means. Output
as the first sound.
[0007]
In another preferred embodiment, the first sound is determined according to the determining
03-05-2019
3
means for determining the direction in which the virtual image is to be formed at the sound
receiving point by the first sound and the second sound, and the direction determined by the
determining means. And adjusting means for adjusting the volume of each of the second sounds,
the boundary frequency, or the time for which the delay means delays the audio signal, and the
first speaker array adjusts the result adjusted by the adjusting means. An audio signal processed
using it is output as the first sound, and the second speaker outputs an audio signal processed
using the result adjusted by the adjusting means as the second sound. In another preferable
aspect, when the second speaker is installed in the room, the diaphragms of the plurality of
second speakers are provided at positions not visible from the sound receiving point. Also, the
present invention has a plurality of first speaker units arranged side by side in the first plane, is
directed to a specific first directivity direction, and is arranged with the plurality of first speaker
units. A first speaker array that outputs a first sound capable of adjusting the angle of the first
pointing direction with respect to the arrangement direction from the plurality of first speaker
units, and a second sound plane arranged in a second plane different from the first plane A
second speaker for outputting a second sound directed to a specific second directivity direction,
and a shield plate, the shield plate being in the normal direction of the first surface A position at
which the second sound is reached only indirectly indirectly through reflection or diffraction
from the second speaker with respect to a sound reception point defined as a position to listen to
the first sound, or the sound reception At the ceiling for the second sound to reach a point
directly In the volume sound pressure ratio is obtained the value above which defines the second
sound shines be installed in a position to reach the sound receiving point to provide a speaker
array apparatus according to claim.
[0008]
According to the present invention, it is possible to realize a small speaker array device in which
a plurality of virtual speakers are formed in the horizontal direction and the ceiling direction,
respectively, as compared to the case where at least two speaker arrays are not installed as in
this configuration.
[0009]
It is a block diagram showing composition of a speaker array device concerning an embodiment.
It is a figure showing the appearance of a speaker array device. It is a figure which shows the
example of the angle which a 1st pointing direction and a 2nd horizontal direction make. It is a
figure which shows the cross section of the speaker array apparatus seen to the 2nd horizontal
direction. It is a block diagram which shows the functional structure of a sound processing part.
03-05-2019
4
It is a figure which shows the example of the path | route of the sound beam which arrives at a
sound receiving point. It is a figure which shows the example of the range which a sound beam
reaches. It is a figure which shows the example of the path | route of a sound beam when it sees
from the front. It is a figure which shows the example of the path | route of a sound beam when
it sees from the ceiling side. It is a figure which shows the position of the virtual image speaker
formed in a sound reception point. It is a figure showing composition of a speaker array device
concerning a modification. It is a figure showing composition of a speaker array device
concerning a modification. It is a figure showing the section of the speaker array device
concerning a modification. It is a figure showing the example of the 1st speaker unit concerning
this modification. It is a figure showing the section of the speaker array device concerning a
modification.
[0010]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the speaker array device 1. The speaker
array device 1 includes a control unit 2, a storage unit 3, an operation unit 4, an interface 5, a
sound processing unit 30, and a first speaker array 10 connected to the sound processing unit
30, which are connected to one another via a bus. And a second speaker array 20. The speaker
array device 1 is a device that outputs sound directed to a specific direction from the first
speaker array 10 and the second speaker array 20 by performing processing on an audio signal
by the sound processing unit 30. Hereinafter, this directed sound is called a sound beam. The
control unit 2 includes a central processing unit (CPU), a random access memory (RAM), a read
only memory (ROM), and the like. The control unit 2 controls each unit of the speaker array
device 1 through the bus by executing a program stored in the storage unit 3 or the ROM. The
control unit 2 also functions as, for example, a setting unit that controls the sound processing
unit 30 to set parameters in each process performed in the sound processing unit 30.
[0011]
The storage unit 3 is a storage unit such as a non-volatile memory, and stores setting parameters
and the like used when the control unit 2 controls each unit. The setting parameters include a
parameter indicating the sound volume of the sound beam, and a parameter that is set by the
control unit 2 according to the direction in which the sound beam is output and that is used by
the sound processing unit 30. The operation unit 4 includes operation means such as a volume
for adjusting the volume level and an operation button for inputting an instruction for changing
the setting, and outputs information indicating the content of the operation to the control unit 2.
03-05-2019
5
The interface 5 is an input terminal or the like for acquiring the audio signal Sin from the outside.
The first speaker array 10 and the second speaker array 20 each have a plurality of speaker
units, and direct a specific direction by outputting audio signals input from the sound processing
unit 30 from these speaker units. Output the sound. The subwoofer 40 outputs sounds in the low
frequency range. The sound processing unit 30 processes the audio signal Sin acquired through
the interface 5 and generates an audio signal output from the first speaker array 10, the second
speaker array 20, and the subwoofer 40, respectively. The sound processing unit 30 supplies the
generated audio signal to the first speaker array 10, the second speaker array 20, and the
subwoofer 40, respectively.
[0012]
FIG. 2 is a view showing the appearance of the speaker array device 1. FIG. 2 shows a state in
which the speaker array device 1 is installed on a horizontal floor surface. The speaker array
device 1 has a hollow casing 6 in which a first speaker array 10 and a second speaker array 20
are provided. The housing 6 is in the form of a six-sided prism including a rectangular surface
61, 62 and a trapezoidal surface 63 adjacent to each other. The first speaker array 10 is provided
on the surface 61, and the second speaker array 20 is provided on the surface 62. The surface
61 is a surface along the vertical direction Y. Further, the surface 61 is a surface directed to the
listener when the speaker array device 1 is installed. That is, the surface 61 is the front of the
speaker array device 1. Hereinafter, the direction in which the surface 61 is peeled, that is, the
direction along the normal to the surface 61 is referred to as a first horizontal direction Z. The
first horizontal direction Z is a direction orthogonal to the vertical direction Y. The surface 62 is a
surface directed to the ceiling when the speaker array device 1 is installed in a room. The surface
63 is a surface that is a side surface when the housing 6 is viewed from the front (from the
surface 61 side).
[0013]
The first speaker array 10 has 14 speaker units from the first speaker units 101 to 114. Below,
these several speaker units are called "1st speaker unit 100", when not distinguishing each. The
respective first speaker units 100 are arranged in a row in a second horizontal direction X which
is a direction orthogonal to both the vertical direction Y and the first horizontal direction Z in the
surface 61 (first surface). It is done. The second horizontal direction X is a direction facing
horizontally and is a direction along the surface 61. That is, each first speaker unit 100 is
referred to as a longitudinal direction of the shape (in this case, a straight line) formed by each
line (this is the longitudinal direction of the first speaker array 10). ) Are arranged along the
03-05-2019
6
second horizontal direction X. In addition, being disposed in the surface 61 mentioned here
means that the end of the first speaker unit 100 having a larger diameter of the diaphragm is
disposed so as to overlap with the plane including the surface 61. . Further, in the first speaker
unit 100, all the main axes of the sound to be output are arranged along the specific direction
(first main axis direction). In the surface 61, 14 holes are made along the second horizontal
direction X, and the first speaker units 100 are exposed from the holes. The first speaker array
10 is directed from these first speaker units 100 in a specific direction (first pointing direction),
and the first pointing direction and the second horizontal direction X (the length of the first
speaker array 10 Outputs a sound beam (first sound) whose angle with the direction can be
adjusted.
[0014]
FIG. 3 is a view showing an example of an angle formed by the first pointing direction and the
second horizontal direction X. As shown in FIG. In FIG. 3, when the speaker array device 1 is
viewed in the vertical direction Y from the second speaker array 20 side, the direction in which
the sound beam B1 output from the first speaker array 10 travels, that is, the first directivity
direction is shown. . In FIG. 3A, the sound beam B1 is a parallel beam having a wave front
(strictly speaking, it is an envelope by an elementary wave front emitted from each speaker, but
is simply expressed as a wave front here). Is shown. An arrow B1u shown in this figure shows an
example of a path along which the wave front of the sound beam B1 advances. In this case, the
wave front of the sound beam B1 advances in a direction forming an angle θ1 with the second
horizontal direction X, as indicated by the arrow B1u, at any position. FIG. 3 (b) shows the case
where the sound beam B1 is a convergent beam in which the wave front has a cylindrical surface.
In this case, the wavefront of the sound beam B1 advances in the direction toward the
convergence point P at any position. Arrows B1v and B1w shown in this figure show an example
of a path along which the wave front of the sound beam B1 advances. For example, when a
portion of the sound beam B1 travels along a path indicated by the arrow B1v, the wavefront of
that portion of the sound beam B1 travels in a direction forming an angle θ2 with the second
horizontal direction X. Also, if another part of the sound beam B1 travels along the path indicated
by the arrow B1w, the wavefront of that part of the sound beam B1 travels in a direction forming
an angle θ3 with the second horizontal direction X. In either case, the first speaker array 10 can
adjust these angles (θ1, θ2, θ3).
[0015]
The second speaker array 20 has ten speaker units from the second speaker unit 201 to 210.
03-05-2019
7
Hereinafter, the plurality of speaker units will be referred to as a "second speaker unit 200" when
not distinguished from one another. The second speaker units 200 are arranged in a row in the
second horizontal direction X on the surface 62. In other words, each second speaker unit 200 is
referred to as a longitudinal direction (in this case, a straight line) of a shape (straight line in this
case) formed by the alignment of the second speaker units 200 (the longitudinal direction of the
second speaker array 20). ) Are arranged along the second horizontal direction X. Further, the
second speaker unit 200 is disposed in a state in which the main axes of the sound to be output
are all along a specific direction (second main axis direction) different from the first main axis
direction. The second speaker array 20 is a speaker array for reflecting a sound beam to be
output by a ceiling of a room and forming a virtual speaker on the ceiling side, as described later.
In many cases, each second speaker unit 200 may be the first speaker unit 100, since the volume
of the sound that should be formed on the ceiling side from the listener should be smaller than
the volume and in front of the listener. A smaller speaker unit is used, and the number is smaller.
The second speaker array 20 is directed from these second speaker units 200 in a specific
direction (second pointing direction), and the second pointing direction and the second
horizontal direction X (the length of the second speaker array 20 Outputs a sound beam (second
sound) whose angle with the direction can be adjusted.
[0016]
Subsequently, how each speaker unit is provided in the housing 6 as viewed in the second
horizontal direction X will be described with reference to FIG. FIG. 4 is a cross-sectional view of
the housing 6 as viewed in the second horizontal direction X. As shown in FIG. In FIG. 4, the cross
section of the housing | casing 6 of the position in which the 2nd speaker unit 200 is provided is
shown. Further, in FIG. 4, for the respective speaker units, not the cross section but the side
surfaces are shown in order to simplify the description. The first speaker unit 100 has a
diaphragm, and the end of the diaphragm having a larger diameter is provided so as to overlap
the plane including the surface 61. In other words, the first speaker unit 100 is provided such
that the diaphragm vibrates in the direction in which the surface 61 faces. This direction is the
above-described first main axis direction W1 and is also a direction indicating the front of the
first speaker unit 100. The first main axis direction W1 is in the direction along the normal to the
surface 61, that is, in the first horizontal direction Z.
[0017]
The second speaker unit 200 includes a diaphragm, and is provided in a recess portion 610 in
which the surface 62 is recessed inward and a hole is formed in the bottom thereof. For this
03-05-2019
8
reason, the second speaker unit 200 is located at a position where the end of the diaphragm
having a larger diameter is deeper than the surface 62 in the interior of the housing 6. That is,
each second speaker unit 200 is a plane 66 (indicated by a two-dot chain line in FIG. 4) formed
by a surface including the bottom of each recess 610. ) Will be arranged side by side. The plane
66 is a plane different from the plane 61 (first plane), and corresponds to an example of the
“second plane” according to the present invention. The plane 66 is parallel to the plane 62.
Further, the second speaker unit 200 is provided such that the diaphragm vibrates in the
direction along the normal to the surface 62. This direction is a direction along the normal to the
plane 66, the above-mentioned second main axis direction W2, and a direction showing the front
of the second speaker unit 200. The plane 62 is inclined at an angle θ4 with respect to the first
horizontal direction Z, in this embodiment, 15 degrees. For this reason, the second main spindle
direction W2 is also inclined toward the first horizontal direction Z by θ4, that is, 15 degrees
with respect to the vertical direction Y.
[0018]
The speaker array device 1 sets each sound beam and the sound beam output from the audio
signal input at the same timing and the sound output from the subwoofer 40 (subwoofer sound)
to the sound reception point at substantially the same timing. The timing to output the
subwoofer sound is changed respectively. Here, the sound receiving point refers to a point
predetermined as a position where the listener listens to the sound output from the speaker
array device 1. In other words, this sound receiving point is assumed to be a position to be
listened to by the listener, and if it is too close to one speaker array, it becomes difficult to hear
the sound from the other speaker array. It is determined to be located at a distance away or
more. Specifically, for example, the sound receiving points are separated from the first speaker
array 10 by 1 m or more in the normal direction (the same direction as the first main axis
direction W1) of the surface 61 and at a position lower than the height of a person. It is
determined to be located. In other words, when such a position is used as a point of sound
reception, the listener can listen to the sound output from the speaker array device 1 with high
quality. In the speaker array device 1, various settings are performed so as to output a sound
beam which is an optimal sound at the sound receiving point. In detail, the speaker array device
1 delays the timing of outputting each of these sounds in accordance with the difference in the
distance that these sounds propagate before reaching the sound receiving point. The difference
in distance referred to here is, for example, the length of the path until the sound beam output
from the first speaker array 10 reaches the sound receiving point, and the sound beam output
from the second speaker array 20 reaches the sound receiving point It is the difference with the
length of the route to
03-05-2019
9
[0019]
When the environment such as the room where the speaker array device 1 is installed, the
position where it is installed in the room, and the position of the sound receiving point changes,
the difference in distance mentioned above also changes, and the time to delay each sound beam
Change. Therefore, when the environment of these changes, the control unit 2 of the speaker
array device 1 has to delay each sound in order to reach these sound reception points at almost
the same timing (hereinafter referred to as “delay time” " And the direction in which these
sounds are output (hereinafter referred to as “output direction”). And are stored in the storage
unit 3 in association with each other. These delay times and output directions are determined as
follows. First, a sound beam is output from the speaker array device 1 installed in a room, and
while scanning the output direction, a position assumed as a sound receiving point in advance
(hereinafter referred to as “measurement position”). Record the sound collected by the
microphone installed in). Next, from the measurement results, for example, the direction in which
the sound of each channel is output is selected and set as the output direction of the sound beam
from among the directions in which the collected sound volume is larger than the surrounding
output direction. Then, from the arrival time of the sound beam output to the set output direction
to the measurement position, the time to delay each sound beam is calculated. The setting of the
output direction and the calculation of the delay time may be performed using a known
technique as disclosed in JP-A-2009-27603. The sound processing unit 30 processes the audio
signal based on the calculated delay time, so that the sound beam and the subwoofer sound
reaching the sound receiving point at substantially the same timing are output.
[0020]
FIG. 5 is a block diagram showing a functional configuration of the sound processing unit 30. As
shown in FIG. The sound processing unit 30 includes a decoder 310, a signal processing unit
320, a bus management unit 330, a delay unit 340, a ceiling beam generation unit 350, and a
horizontal beam generation unit 360. The decoder 310 decodes the input signal Sin input from
the interface 5. Here, in the present embodiment, the input signal Sin represents an audio signal
of 5.1 ch. The decoder 310 supplies the 5.1 channel audio signal obtained by decoding the input
signal Sin to the signal processing unit 320.
[0021]
The signal processing unit 320 adds a signal newly generated by adding reverberation,
03-05-2019
10
separating reverberation, or applying an effect to the supplied 5.1 ch audio signal as a bus
management unit by adding a signal newly generated thereto. Supply to 330. The signal
processing unit 320 newly generates three channels of extension signals from the five channels
of extension signals that include reverberation or effects among the extension signals, and the
second speaker array 20 The signal used for the purpose (hereinafter referred to as "the signal
for top surface". )とする。 Specifically, the signal processing unit 320 adds “L ′ + SL ′”
obtained by adding the extension signals “L ′” and “SL ′” generated from the “L” and
“SL” channels among the five channels to one. One channel (this is called the "top L" channel.
And "R '+ SR'", which is obtained by adding the extension signals "R '" and "SR'" generated from
the channels of "R" and "SR", is one channel (this is called "top R" channel . )とする。 Also, the
channel "C" attenuated as described above is referred to as "top surface C". Thus, the signal
processing unit 320 supplies the bus management unit 330 with a signal for top surface having
three channels of “top surface L”, “top surface R”, and “top surface C”.
[0022]
In addition, the signal processing unit 320 is a signal used for the first speaker array 10
(hereinafter referred to as “the signal from the 5.1 channel raw audio signal input or the signal
obtained by subtracting the reverberation component from the input 5.1 channel signal) It is
called "horizontal signal". ) To the bus management unit 330. Thereby, the first speaker array 10
outputs the audio signal as a sound beam (first sound). Further, when the signal processing unit
320 reproduces the same audio signal from both the first speaker array 10 and the second
speaker array 20, the sound represented by the other signal is generated according to the
volume of the sound represented by one signal. Reduce the volume of This is, for example, if the
top signal represents a sound of 70% of the volume of the sound represented by the audio signal
after decoding, the horizontal signal of 30% of the sound If the top signal represents a sound of
10% volume, the horizontal signal represents a sound of 90% volume. By thus balancing the
volume of the signal processing unit 320, it is possible to localize at the middle of the localization
positions formed by both speaker arrays while maintaining the volume feeling of the original
audio signal.
[0023]
From the supplied audio signals, the bus management unit 330 calls an audio signal in a bass
range including a low frequency effect (LFE) channel for the subwoofer (hereinafter, referred to
as “subwoofer signal”). Separate). Thereby, the audio signal is referred to as a signal for the
first speaker array 10 (hereinafter, referred to as “front signal”). And a signal for top surface
03-05-2019
11
and a signal for subwoofer. In addition, the bus management unit 330 performs processing of
attenuating sound in a frequency band lower than a predetermined frequency (so-called cut-off
frequency) from the frequency band represented by the signal for the top surface signal. Thus,
the audio signal attenuated in this manner is output from the second speaker array 20 as a sound
beam (second sound). The bus management unit 330 functions as the "attenuation means"
according to the present invention. The bus management unit 330 supplies these audio signals to
the delay unit 340.
[0024]
The delay unit 340 (delay means) receives the audio signal of each channel included in the
supplied front signal, top surface signal, and subwoofer signal, and the sound beams and
subwoofer sounds output based on these signals are as described above. It is delayed according
to the difference in distance to reach the received point. In detail, first, the delay time stored in
the storage unit 3 is supplied from the control unit 2 to the delay unit 340 in association with
each output direction. Then, the delay unit 340 delays the signals by the delay time associated
with the direction in which the audio signal of each channel is output. Since this delay time is not
for controlling directivity, it is the same for each of the plurality of speaker units that each
speaker array has. The delay unit 340 supplies the delayed top signal to the ceiling beam
generation unit 350, and supplies the delayed front signal to the horizontal beam generation unit
360. Also, the delay unit 340 supplies the delayed subwoofer signal to the D / A converter
connected to the subwoofer 40.
[0025]
The ceiling beam generation unit 350 delays the audio signal of each channel included in the
supplied sky signal according to each output direction. Here, the delay time is a time determined
for each of the second speaker units 200 according to the output direction. Then, the ceiling
beam generation unit 350 adds the delayed audio signals of the respective channels, and outputs
the result to the second speaker unit 200. In this manner, the ceiling beam generation unit 350
controls the directivity of the sound related to the sky signal supplied from the delay unit 340.
[0026]
The audio signal output from the ceiling beam generation unit 350 is D / A converted by a D / A
03-05-2019
12
converter, amplified by an amplifier, and output as a sound beam from each second speaker unit
200. In this way, the sound beams of the sound pertaining to each of the channels "top L", "top
R", and "top C" are output from the second speaker array 20 by directing them in the directions
set respectively. . Since these sound beams are output from the above-described signal for sky
plane, they are sounds having a frequency band higher than a predetermined frequency. Also in
the horizontal beam generation unit 360, processing similar to that of the ceiling beam
generation unit 350 is performed, and the sound beam of sound relating to each channel is
output from the first speaker array 10 by directing the set direction.
[0027]
Subsequently, regarding how the sound beam output from the second speaker array 20 reaches
the sound receiving point, the second speaker array 20 and the first speaker array 10 (that is, the
speaker array device 1) have a predetermined height. The case where it is installed and used in a
room having a ceiling as a reflection surface will be described as an example. FIG. 6 is a view
showing an example of a path of a sound beam reaching the sound receiving point Q1 from the
speaker array device 1 installed in the room 1000. As shown in FIG. In FIG. 6, for convenience of
explanation, the first speaker array 10 and the second speaker array 20 inside the speaker array
device 1 are indicated by solid lines. A room 1000 is a room in which a ceiling 1001, four wall
surfaces 1002 and a floor surface 1003 form a rectangular parallelepiped, and a television 2000
is installed on one wall surface 1002 side. The ceiling 1001 has a height of 2.4 m from the floor
surface 1003, and the floor surface 1003 is horizontal. In FIG. 6, the speaker array device 1 is
installed such that the first main axis direction W1 is along the floor surface 1003. That is, the
speaker array device 1 is installed such that the first main axis direction W1 faces in the
horizontal direction (the first horizontal direction Z), as in the state shown in FIG. In addition, the
speaker array device 1 is installed on the television stand together with the television 2000. As a
result, the first speaker array 10 is located at a height of 0.5 m from the floor surface 1003 and a
height of 0.6 m. The second speaker array 20 is located on the left. The sound receiving point Q1
is located on the front side of the first speaker array 10 and where the sound beam B1 output
from the first speaker array 10 directly reaches. Here, "to reach directly" means that the sound
(sound beam) output from the first speaker array 10 propagates to the sound receiving point Q1
without undergoing reflection or diffraction. In FIG. 6, the sound reception point Q1 has a
distance of 2.0 m in the first horizontal direction Z from the position where the sound beam B2 is
output from the second speaker array 20, and a height of 0.8 m from the floor surface 1003. It is
located in
[0028]
03-05-2019
13
Similar to FIG. 4, the second speaker array 20 outputs the sound beam B2 in the second main
axis direction W2 which is inclined 15 degrees toward the sound receiving point Q1 side with
respect to the vertical direction Y. The sound beam B2 thus output in the upward direction in the
vertical direction Y is reflected by the ceiling 1001 of the room 1000 and travels in the
downward direction in the vertical direction Y. Here, the sound beam B2 is a sound having
directivity by wavefront synthesis in the second horizontal direction X, but the normal sound
output from the speaker unit in the first horizontal direction Z As well, it is a free radiation
sound. In other words, since the second speaker array 20 is not arranged in the first horizontal
direction Z, the directivity of the speaker array can not be obtained in this direction. As described
above, the free radiation sound refers to a sound having free directivity, which is not due to the
wave front synthesis of the speaker array. Of the sound beam B2, a component B2x moving in
the second main axis direction W2 and a component B2y moving in a direction inclined 30
degrees to the sound receiving point Q1 with respect to the vertical direction Y (that is, the
second main axis The position where the component of the sound emitted in the direction of 15
degrees with respect to the direction W2 reaches is compared. The component B2x, after being
reflected by the ceiling 1001, reaches the height of the sound receiving point Q1 at a position
approximately 0.9 m away from the second speaker unit 200 in the first horizontal direction Z,
and the component B2y is similarly approximately The height of the sound receiving point Q1 is
reached at a position 2.0 m away. Further, the component B2y has a volume that can be heard by
the listener at the sound receiving point Q1. That is, the sound beam B2 is output so that the free
radiation component B2y reaches the sound receiving point Q1. Here, that the sound (sound
beam) reaches the sound receiving point means that a sound having a volume that is
substantially audible to the listener reaches the sound receiving point.
[0029]
On the other hand, in the case of the example of FIG. 6, it is difficult for the sound beam B2 to
reach the sound receiving point Q1 directly. FIG. 7 is a diagram showing an example of the range
reached by the sound beam output from the speaker array device 1. In FIG. 7, the boundary R1 of
the range in which the sound beam B1 significantly reaches and the boundary R2 of the range in
which the sound beam B2 significantly reaches are respectively indicated by broken lines. Here,
“to reach significantly” means to overcome the preceding sound from the other direction and
to reach a loud enough sound to be heard “from that direction” as the first sound. . In FIG. 7,
the sound receiving point Q1 is included in the range indicated by R1, and it is shown that the
sound beam B1 significantly reaches the sound receiving point Q1. On the other hand, in the
second speaker array 20, as shown in FIG. 4, the depressions 610 are provided in front of the
respective second speaker units 200. When the second speaker unit 200 is viewed from the
sound reception point Q1, the recessed portion 610 is configured such that the diaphragm
03-05-2019
14
described in FIG. 4 can not be seen. Assuming that the boundary in the case where the second
speaker array 20 is provided such that the plane including the surface 62 shown in FIG. 4 and
the end with the larger diameter of the diaphragm overlap without the recess 610 is R2 x, the
sound beam Since the hollow portion 610 narrows the angle emitted by B2, the boundary R2 is
configured to exhibit a narrower range than the boundary R2x.
[0030]
Furthermore, compared to the first speaker unit 100, the second speaker unit 200 is provided
with its front surface facing away from the direction in which the sound receiving point Q1 is
located. As a result, the sound receiving point Q1 is not included in the range indicated by R2.
That is, the sound beam B2 does not reach the sound receiving point Q1 directly without being
diffracted. If the speaker arrangement is such that the emitted sound beam B2 directly reaches
the sound receiving point Q1 without undergoing diffraction, this directly arrived sound
(hereinafter referred to as "direct sound"). ) Is a sound reflected by the ceiling 1001 as shown in
FIG. 6 and reached (hereinafter referred to as “reflected sound”). Since the distance of the
route to the sound receiving point Q1 is shorter than in the case of), the same sound can be
heard earlier than the reflected sound. For this reason, at the sound receiving point Q1,
localization is felt from the direction of the speaker main body due to the preceding sound effect.
On the other hand, in the speaker array device 1 according to the present embodiment, only the
reflected sound reaches the sound receiving point Q1, so that it is possible to prevent the
localization from being felt from the direction of the speaker main body. (Alternatively, as the
volume of the reflected sound exceeds the direct sound by a fixed volume level, it is easy to sense
the localization towards the ceiling. 」)
[0031]
FIG. 8 is a diagram showing an example of the path of the sound beam B2 when the speaker
array device 1 is viewed from the front. The sound beam B2 is composed of sounds directed in a
plurality of directions with respect to the second horizontal direction X. Specifically, the speaker
array device 1 is a wall 1002L on the left side as viewed from the sound receiving point Q1. The
sound beam B2L reflected first, the sound beam B2R reflected first on the right wall surface
1002R, and the central sound beam B2C not reflected on the wall surface are output. These
sound beams B2L, B2R, and B2C are all output from the second speaker array 20, are reflected
by the reflecting surfaces U2L, U2R, and U2C of the ceiling 1001, respectively, and reach the
sound receiving point Q1. As described above, in the speaker array device 1, virtual speakers can
be formed at different positions in the second horizontal direction X even in the direction of the
03-05-2019
15
ceiling 1001 when viewed from the sound reception point Q1.
[0032]
FIG. 9 is a view showing an example of the path of the sound beam B1 when the speaker array
device 1 is viewed from the ceiling side. The first speaker array 10 outputs the audio signal of
the “C” channel as a sound beam B1C directed straight to the sound receiving point Q1. Also,
the first speaker array 10 reflects the audio signal of the “R” channel on the wall surface
1002R as a sound beam B1L that reflects the audio signal of the “L” channel on the wall
surface 1002L toward the sound receiving point Q1. It outputs as a sound beam B1R heading for
the point Q1. Further, the first speaker array 10 reflects the audio signal of the “SL” channel
by the wall surface 1002 L and the wall surface 1002 B behind the sound receiving point Q 1
and outputs it as a sound beam B 1 SL toward the sound receiving point Q 1, “SR” The audio
signal of the channel is reflected by the wall surface 1002R and the wall surface 1002B and
output as a sound beam B1SR directed to the sound receiving point Q1. Thus, the speaker array
device 1 forms virtual speakers in five different directions in the horizontal direction viewed from
the sound reception point Q1 by the sound beam B1 output from the first speaker array 10.
[0033]
Among the sound beams output as described above, the sound beam B1 is transmitted in the
horizontal direction from the position where the speaker array device 1 is located to reach the
sound receiving point Q1, and the sound beam B2 is directed downward from the ceiling 1001
side Transmit to reach the sound receiving point Q1. Further, as described above, the sound
beams B1 and B2 are output audio signals delayed by the delay unit 340 according to the
difference in distance from each speaker array to the sound receiving point Q1. Therefore, the
portions representing the same audio signal among the sound beams reach the sound receiving
point Q1 at substantially the same timing. When the listener is listening to these sound beams at
the sound receiving point Q1, the listener feels that the sound image is localized in the direction
sandwiched between the two directions because these arrive from two directions. As a result, a
virtual image speaker (virtual image) also called a phantom is formed.
[0034]
FIG. 10 is a diagram showing the position of the virtual image speaker formed at the sound
03-05-2019
16
receiving point Q1. In FIG. 10, sound beams B1C and B2C which the first speaker array 10 and
the second speaker array 20 respectively output in the middle of the second horizontal direction
X are shown. The sound beam B1C is an output of an audio signal obtained by delaying the audio
signal of the sound beam B2C, and when the sound reception point Q1 is reached, the sound
beam B1C is the same as the sound beam B2C reaching the sound reception point Q1 at the same
timing. The sound is delayed so that it can be heard at the sound receiving point Q1. In the
example of FIG. 10, at the sound receiving point Q1, the virtual image speaker V1 is formed in
the direction toward the top of the television 2000 among the directions sandwiched by the
sound beams B1C and B2C. Thus, in the speaker array device 1, virtual image speakers can be
formed in a direction away from the sound reception point Q 1 in the vertical direction Y with
respect to the direction from the sound reception point Q 1 to the speaker array device 1.
[0035]
As described above, in the speaker array device 1, the second speaker array 20 in which the
plurality of second speaker units are arranged in the second horizontal direction X is provided
with the front facing upward in the vertical direction Y. A virtual speaker can be formed on the
ceiling 1001 while outputting a sound beam capable of adjusting the angle between the pointing
direction and the second horizontal direction. In addition, the speaker array device 1 has a
direction different from the second horizontal direction X in which the second speaker units are
arranged, in order for the reflected sound from the ceiling 1001 to reach the sound receiving
point Q1 located at a position separated in the first horizontal direction Z. The directionality of
the free radiation of the sound beam B2 in the first horizontal direction Z is used. Therefore, in
the speaker array device 1, the second speaker units do not have to be arranged in the first
horizontal direction Z or the vertical direction Y. In order to make the reflected sound from the
ceiling 1001 reach the sound receiving point Q1, if a speaker array in which speaker units are
arranged in the first horizontal direction Z is provided, a sound directed in the second horizontal
direction X is output. In this case, the speaker array has to be further arranged in the second
horizontal direction X. The speaker array device 1 can reduce the number of second speaker
units as compared to the speaker array device configured as described above, and the device can
be miniaturized.
[0036]
In the speaker array device 1, the second speaker array 20 outputs a sound beam whose band is
a frequency higher than a predetermined frequency. High frequency sounds have the property of
being more directional, i.e. less likely to diffract, than low frequency sounds. For this reason, in
03-05-2019
17
the speaker array device 1, direct sound hardly reaches the sound receiving point Q1 as
compared with the case of outputting a sound beam including sound of a frequency lower than
the frequency determined from the second speaker array 20. You can do so. In other words,
compared with the above case, the speaker array device 1 is closer to the device in the area
where the sound reception point Q1 can hear the sound beam B2 without being interrupted by
the direct sound from the second speaker array 20. It can be extended to the position.
[0037]
[Modifications] The above-described embodiment is only an example of implementation of the
present invention, and various applications and modifications are possible as follows, and it is
also possible to combine them as required.
[0038]
(Modification 1) The first speaker array 10 and the second speaker array 20 are provided in the
same housing 6 in the above-described embodiment, but may be provided in different housings.
FIG. 11 is a diagram showing a configuration of a speaker array device 1a according to the
present modification. The speaker array device 1a has cases 6a1 and 6a2, the first speaker array
10a is provided in the case 6a1, and the second speaker array 20a is provided in the case 6a2.
For example, when the housing 6a2 is installed on the upper side of the television 2000a, the
range in which the direct sound from the second speaker array 20a reaches the ceiling 1001 side
as compared with the case where the second speaker array 20 is installed at a lower position
than this. It will shift to Thereby, when the speaker array device 1a is used, it is possible to make
it difficult for direct sound to reach the sound receiving point Q1 as compared with the case
where there is one housing.
[0039]
(Modification 2) In the embodiment described above, as shown in FIG. 4, the angle θ4 in which
the second main spindle direction W2 is inclined to the sound receiving point Q1 with respect to
the vertical direction Y is 15 degrees. Not limited to θ4 may be 30 degrees or 0 degrees. When
θ4 is 0 degrees, the second main spindle direction W2 coincides with the vertical direction Y,
and the second speaker unit 200 is directed vertically upward. Whatever the angle θ4 is, in
short, the second main axis direction W2 is sufficiently away from the direction from the second
03-05-2019
18
speaker unit 200 to the sound receiving point Q1, and a direct sound is received at the sound
receiving point Q1 The second speaker unit 200 in a direction in which the reflected sound
reaches the sound receiving point Q1 at a volume that is sufficiently louder than the direct
sound, even if the direction is not reached The second speaker array 20 may be installed such
that the normal to the surface 66 (second surface) shown in FIG. 4 is along this direction. Here,
"the volume of the reflected sound is sufficiently larger than that of the direct sound" means that
the sound pressure (energy) ratio of the reflected sound to the direct sound is equal to or higher
than a predetermined value. If the reflected sound is loud enough to be louder than the direct
sound, the direct sound is masked by the reflected sound, and the listener feels that he can not
hear the direct sound that is actually arriving, or the direct sound is higher than the original
volume It feels like the volume is too small. Further, the direction in which the front of the
second speaker unit 200 is directed may not be the direction inclining to the sound receiving
point Q1 side, but the direction inclining to the opposite side thereto. FIG. 12 is a diagram
showing a configuration of a speaker array device 1b according to the present modification. The
speaker array device 1 b includes a second speaker unit 200 b whose front surface is directed in
the direction inclined to the opposite side to the sound receiving point Q 1 with respect to the
vertical direction Y. In this case, the sound beam B2b output from the second speaker unit 200b
is reflected by the television 2000 and is then reflected by the ceiling 1001 to reach the sound
receiving point Q1. In the speaker array device 1b, the second speaker unit 200b is installed at a
position where the diaphragm can not be seen when viewed from the sound receiving point Q1.
In this case, the significant direct sound from the second speaker unit 200b reaches the range
indicated by the boundary R2b. In FIG. 12, the boundary R2 shown in FIG. 7 is indicated by a
two-dot chain line. As shown in FIG. 12, when the front direction of the second speaker unit 200
is away from the sound receiving point Q1, the boundary is moved from R2 to R2 b in a direction
away from the sound receiving point Q1.
Thus, the speaker array device 1b can make it more difficult for direct sound to reach the sound
receiving point Q1 than when the front of the second speaker unit 200 is inclined to the sound
receiving point Q1.
[0040]
More preferably, the second speaker array may output a sound beam whose sound pressure ratio
at the sound reception point Q1 is approximately 12 dB (decibel) or more. When the direct sound
reaches the sound receiving point Q1 earlier (about 30 ms) earlier than the reflected sound, the
listener may feel that the sound has reached only from the direction of the direct sound. When
this phenomenon known as the so-called Haas effect occurs, the listener can not sense that the
virtual array to be formed in the direction in which the ceiling is formed is not formed, and the
03-05-2019
19
speaker array device itself is ringing. Here, if the sound pressure ratio is 12 dB or more, the
Hearth effect is canceled, and a virtual speaker by the reflected sound is formed in the direction
in which the reflected sound arrives. Thus, the speaker array device can form a virtual speaker by
the reflected sound at a stable position.
[0041]
(Modification 3) In the embodiment described above, the radiation of the sound beam B2 to the
sound receiving point Q1 side is suppressed by providing the recessed portion 610 in the surface
62, but the radiation may be suppressed by any other method. Good. For example, the second
speaker unit 200 is provided in a place where the hole 62 is merely provided in the surface 62
and the second speaker unit 200 is hidden behind the plane including the surface 62 and can not
be seen from the sound receiving point Q1 without providing the recessed portion 610. It is also
good. In this case, the sound beam B2 is partially blocked by the rear surface of the surface 62 to
suppress the radiation. Further, for example, the housing may be provided with a member that
blocks part of the path of the sound beam B2. FIG. 13 is a view showing a cross section of a
housing 6c of a speaker array device 1c according to the present modification. In FIG. 13, as in
FIG. 4, the side surfaces of the speaker units are shown. Unlike the case 6, in the case 6c of the
speaker array device 1c, the recess 62 is not provided on the surface 62c, and the end of the
diaphragm with the second speaker unit 200c having a larger diameter is a surface It is provided
to overlap with the plane including 62c. In other words, the respective second speaker units 200
are arranged side by side in the surface 62c (an example of the second surface). Further, on the
surface 62c, a shielding plate 620 is provided at a position closer to the sound receiving point Q1
than the second speaker unit 200c when the speaker array device 1c is installed as shown in FIG.
In the speaker array device 1c, when viewed from the sound receiving point Q1, the diaphragm
of the second speaker unit 200c is located at a position where it is blocked by the shielding plate
620 and can not be seen. The shielding plate 620 blocks a portion of the sound beam output
from the second speaker unit 200 c that radiates in the first horizontal direction Z. FIG. 13 shows
a boundary R2c of a range in which the sound beam partially blocked by the shielding plate 620
significantly reaches and a boundary R2y when the shielding plate 620 is not present. Since the
shielding plate 620 blocks the portion of the sound beam that radiates in the first horizontal
direction Z, direct sound from the second speaker unit 200 can reach without being diffracted as
shown in FIG. There is no wide range. That is, the speaker array device 1 c can make it more
difficult for direct sound to reach the sound receiving point Q 1 than when the shielding plate
620 is not provided.
[0042]
03-05-2019
20
(Modification 4) Although the speaker array device 1 outputs the sound beam B2 whose band is
a frequency higher than the predetermined frequency in the above-described embodiment, the
present invention is not limited to this. The speaker array device 1 may output the sound beam
B2 of the frequency band as it is without removing sound of a frequency lower than a
predetermined frequency from the supplied audio signal. In short, the second speaker array 20
may be installed so that the front of the second speaker unit 200 faces the direction in which the
volume of the reflected sound is sufficiently larger than that of the direct sound at the above
sound receiving point Q1. .
[0043]
(Modification 5) In the embodiment described above, the first speaker units 100 are provided
side by side in the second horizontal direction X, but may be provided side by side in a direction
different from this. For example, the respective first speaker units 100 may be provided side by
side in a direction obliquely forming an angle with the second horizontal direction X, or may be
arranged in an arc or V shape instead of a linear shape. May be provided. These linear, arc or Vshapes are examples of the shape formed by the array of each first speaker unit 100. In addition,
each first speaker unit 100 may be provided side by side in two or more rows. In any case, the
first speaker units 100 may be arranged side by side in the surface 61 (first surface). Thereby,
the first speaker array 10 is oriented in a specific direction (first pointing direction), and the
angle between the direction and the longitudinal direction of the shape formed by the alignment
of the respective first speaker units 100 is adjusted. Output a sound beam B1 (first sound) that
can be The term "longitudinal direction" as used herein refers to the direction along the long side
of the smallest rectangle that can include the shape formed by this arrangement.
[0044]
FIG. 14 is a diagram showing an example of the first speaker unit according to the present
modification. FIG. 14 shows a plurality of first speaker units 100e (FIG. 14 (a)) and a plurality of
first speaker units 100f (FIG. 14 (b)), each viewed in the negative direction of the first horizontal
direction Z. Show the The plurality of first speaker units 100 e are formed in an arc-like shape, as
indicated by the two-dot chain line. The rectangle T1 represents the smallest rectangle that can
contain this shape. In this case, the direction indicated by S1 which is an arrow along the long
side T1a of the rectangle T1 is the longitudinal direction. The plurality of first speaker units 100f
are formed in a V-like shape further indicated by two-dot chain lines. The rectangle T2
represents the smallest rectangle that can contain this shape. In this case, the direction indicated
03-05-2019
21
by S2 which is an arrow along the long side T2a of the rectangle T2 is the longitudinal direction.
Each of these first speaker units is directed to a specific direction (first pointing direction), and a
sound beam (first sound) capable of adjusting the angle between the direction and the
longitudinal direction Can be output.
[0045]
(Modification 6) In the embodiment described above, the respective second speaker units 200
are provided side by side in the second horizontal direction X, but in the same manner as the
respective first speaker units 100 in the modification 5 described above, It may be provided side
by side in a direction different from this. For example, the second speaker units 200 may be
provided side by side in a direction obliquely forming an angle with the second horizontal
direction X. In addition, the second speaker units may be provided so that the direction in which
they are arranged along the way change, in other words, they do not have to be arranged in a
straight line. For example, the respective second speaker units may be provided side by side so as
to be arc-shaped or V-shaped. In any case, the respective second speaker units 200 may be
arranged in a line along the surface 66 (second surface). Thereby, the second speaker array 20 is
oriented in a specific direction (second directivity direction), and the angle between the direction
and the longitudinal direction of the shape formed by the arrangement of the second speaker
units 200 is adjusted. Output a sound beam B2 (second sound) that can be It is desirable that the
longitudinal direction of the second speaker array 20 be along the longitudinal direction of the
first speaker array 10 described above, and even if it is not along the longitudinal direction of the
first loudspeaker array 10, these longitudinal directions when viewed from the vertical direction
Y It is good if the directions are not orthogonal. Even in this case, in the speaker array device, the
number of second speaker units can be reduced and the size can be reduced as compared with
the case where the second speaker units are arranged in the first horizontal direction Z. Although
the second speaker array has a plurality of second speaker units arranged in a line, a part of
these second speaker units is arranged in a plurality of lines, or in the first horizontal direction Z.
It may be side by side. Even in this case, in the portion where the plurality of second speaker
units are arranged in a line, the number of second speaker units can be reduced similarly to the
above, and the size can be reduced.
[0046]
(Modification 7) In the above-described embodiment, the place where the speaker array device 1
is installed is on the television stand installed in the rectangular room 1000, but the present
invention is not limited thereto. It may be in another room having a shape other than a
03-05-2019
22
rectangular parallelepiped. In addition, the location where the speaker array device 1 is installed
may be outdoors, in which case it has a reflective surface that reflects the sound beam output
from the speaker array device 1 and is located at a position higher than the sound receiving
point. It may be a space having a vertically downward reflecting surface. The speaker array
device 1 can form a plurality of virtual speakers having different positions in the second
horizontal direction in the vertically upward direction as viewed from the listener by reflecting
the sound beam on the reflection surface.
[0047]
(Modification 8) In the embodiment described above, the second speaker unit 200 of the second
speaker array 20 is exposed to the outside of the housing 6, but may be provided so as not to be
exposed to the outside of the housing . FIG. 15 is a view showing a cross section of a housing 6d
of the speaker array device 1d according to the present modification. Similar to FIG. 4, FIG. 15
shows the side surface of each speaker unit. The speaker array device 1 includes a second
speaker unit 200d provided side by side in an inner surface 66d (an example of a second
surface) of the housing 6d. The second speaker unit 200d is provided with the front facing the
reflective surface 64d inside the housing 6d. An opening 65d opened to the outside is provided
on the vertically upward surface 62d of the housing 6d. The sound beam B2d output from the
second speaker unit 200 is reflected by the reflection surface 64d, passes through the opening
65d, is reflected by the ceiling 1001, and reaches the sound receiving point Q1. Also in the
speaker array device 1d, the diaphragm of the second speaker unit 200d is provided at a position
where it can not be seen from the sound reception point Q1. In this case, since the range in
which the sound beam B2d is radiated in the first horizontal direction Z is narrowed at the
opening 65d, it is possible to make it difficult for the direct sound to reach the sound receiving
point Q1.
[0048]
(Modification 9) In the embodiment described above, the sound of each channel is output to a
specific path, but the path may be dynamically changed according to the contents of the sound
included in each channel. For example, the speaker array device 1 compares the audio signals of
the sounds of the "L" and "R" channels included in the horizontal signal, and sets the component
having a high correlation to the "upper surface C" channel of the upper surface signal It is
condition that it is output including. Also, in this case, the volume of the sound beam to the path
for outputting the "L" and "R" channels may be reduced. As a result, when the speaker array
device 1 according to the present modification is used, the image represented by moving the
03-05-2019
23
sound of the image moving the sound source in the vertical direction from the “L” channel to
the “R” channel (or vice versa) When outputting a sound, the sound can be made to reach from
a virtual speaker formed in a direction that more closely matches the position of the sound
source.
[0049]
(Modification 10) In the embodiment described above, the input signal Sin represents an audio
signal of 5.1 ch including five channels of "R", "L", "C", "SR" and "SL". However, the present
invention is not limited to this, and may be, for example, an audio signal such as 7.1 ch or 9.1 ch
more than this, or an audio signal such as 3.1 ch smaller than this. Also, the audio signal may
include a height channel representing sound in the vertical direction. In this case, the signal
processing unit 320 supplies the bus management unit 330 with a top signal including the
height channel and a horizontal signal not including the same. Thereby, the sound of the height
channel is output from the second speaker array 20, and a virtual speaker in which this sound is
output in the ceiling direction is formed.
[0050]
(Modification 11) In the embodiment described above, the direction in which the virtual image
speaker V1 is formed is determined as shown in FIG. 10, but in the speaker array device 1, this
may be changed. This direction changes in the vertical direction Y when the difference in volume
of the sound beam B1C with respect to the sound beam B2C is changed. This direction is also
changed by changing the frequency band of the sound beam B2C. In the speaker array device 1
according to the present modification, first, the user operates the operation unit 4 to determine
the direction in which the virtual image speaker is to be formed, and the control unit 4 sends
information indicating the determined direction to the control unit 2 Output. In this case, the
operation unit 4 functions as a "determination unit" according to the present invention. Next, the
control unit 2 adjusts parameters such as volume and boundary frequency of each of the sound
beam B1 (first sound) and the sound beam B2 (second sound) according to the information
output from the operation unit 4 Do. Specifically, the control unit 2 adjusts these parameters
read from the storage unit 3 according to the information output from the operation unit 4. Then,
if the adjusted parameter is a volume, the control unit 2 supplies this to the signal processing
unit 320. Also, if the adjusted parameter is a boundary frequency, the control unit 2 supplies this
to the bus management unit 330. The first speaker array 10 and the second speaker array 20
respond to the audio signal output from the signal processing unit 320 or the bus management
unit 330 according to these parameters adjusted by the control unit 2 as shown in FIG. The
03-05-2019
24
processed ones are output as respective sound beams. These sound beams are such that virtual
image speakers are formed in the direction in which the above-mentioned parameters
correspond to the information output from the operation unit 4. Thereby, the direction in which
the virtual image speaker is formed as viewed from the sound receiving point Q1 is adjusted. In
this case, the control unit 2 functions as the “adjustment unit” according to the present
invention.
[0051]
DESCRIPTION OF SYMBOLS 1 ... Speaker array apparatus, 2 ... Control part, 3 ... Storage part, 4 ...
Operation part, 5 ... Interface, 6 ... Housing | casing, 10 ... 1st speaker array, 20 ... 2nd speaker
array, 30 ... Sound processing part, DESCRIPTION OF SYMBOLS 40 ... Subwoofer, 100 ... 1st
speaker unit, 200 ... 2nd speaker unit, 310 ... Decoder, 320 ... Signal processing part, 330 ... Bus
management part, 340 ... Delay part, 350 ... Ceiling beam generation part, 360 ... Horizontal beam
Generation unit, 1000 ... room, 1001 ... ceiling, 1002 ... wall surface, 1003 ... floor surface
03-05-2019
25
Документ
Категория
Без категории
Просмотров
0
Размер файла
46 Кб
Теги
jp2015043618
1/--страниц
Пожаловаться на содержимое документа