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JP2010177891

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2010177891
The present invention provides a speaker array device, a signal processing method, and a
program capable of obtaining a good surround effect even if the direction of a sound image to be
perceived by a listener is limited by the shape of a room. A speaker array device (1) according to
an embodiment of the present invention assigns a predetermined frequency characteristic
generated based on head-related transfer characteristics to an audio signal of a channel whose
directivity direction to be set can not be determined. Do. Then, the sound image localization
position given the predetermined frequency characteristic can be changed in a direction different
from the arrival direction of the sound beam by outputting as a beam of sound of the same
directivity in another channel. Therefore, even if the path of the sound beam is limited depending
on the shape of the room 100, the listening position, etc., the sound image is localized in front of
and behind the listener 200 by changing the sound image localization position, and a good
surround is obtained. You can get the effect. [Selected figure] Figure 4
Speaker array device, signal processing method and program
[0001]
The present invention relates to a surround reproduction technology using a speaker array.
[0002]
The delay array type speaker array device outputs slightly different delay times so that the same
audio signal can simultaneously reach the focal point in space from a plurality of linear or planar
speakers, and outputs the same audio signal. The acoustic energy around the focal point is
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intensified by in-phase addition, and as a result, a technique is used to create a sound beam
having strong directivity in the focal direction.
This speaker array device performs such delay processing for each of multi-channel (for example,
C: center, FL: front Lch, FR: front Rch, SL: rear Lch, SR: rear Rch) audio signals. By adding the
delayed signals of all channels and adding them to the speaker, it is possible to give different
directivity to the beams of sound relating to multi-channel and simultaneously output (for
example, Patent Document 1) ).
[0003]
By using the technology as shown in Patent Document 1, as shown in FIG. 6, the conventional
speaker array apparatus 1000 causes the wall of the room 100 to be reflected to cause the beam
of sound relating to each channel to reach the listening position. be able to. Thereby, the listener
200 in the listening position localizes the sound image in the wall surface direction, and for
example, in addition to the front speaker array device 1000, the virtual speaker 300-FL, 300-FR,
300-SL, 300-SR is released. Since it can be perceived as being sounded, a good surround effect
can be obtained.
[0004]
JP, 2006-25153, A
[0005]
In the conventional speaker array apparatus 1000, the listener 200 may, for example, have a
wall surface (see FIG. 4A) immediately behind the listener 200 (lower side in the figure) or no
wall surface behind the listener 200. In some cases, it is not possible to make the beam of sound
reach the listening position using the reflection of the wall behind the.
In such a case, it is not possible to localize the sound image to the rear side of the listener 200,
and the speaker array apparatus 1000 sets the channels SL and SR to be localized to the rear of
the listener 200 respectively to the channels FL and FR. Since the sound is mixed and localized in
the directions of the virtual speakers 300-FL and 300-FR, the surround effect may be weak.
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[0006]
The present invention has been made in view of the above-mentioned circumstances, and a
speaker array device capable of obtaining a good surround effect even if the direction of a sound
image to be perceived by a listener is limited by the shape of a room, signal processing It aims to
provide a method and program.
[0007]
In order to solve the problems described above, the present invention has a plurality of channels
for processing audio signals, and supplies an audio signal of each of the channels to a plurality of
speakers to output as directional sound. And directivity control means for controlling the
directivity of the sound related to each channel so as to generate one or more sets of channels
having substantially the same directivity in the plurality of channels, and the set of the
substantially same directivity The speaker array device is characterized by comprising frequency
characteristic giving means for giving a frequency characteristic to change the sound image
localization position in any one of the channels.
[0008]
Further, in another preferable aspect, the recognition means for recognizing the direction in
which the sound according to the set of channels having substantially the same directivity
reaches the listening position as an angle, and the frequency characteristic giving means is for
the recognition in the channel It is characterized in that a frequency characteristic according to
the angle recognized by the means is given.
[0009]
Further, in another preferable aspect, the frequency characteristic given by the frequency
characteristic giving unit is a frequency characteristic generated based on the frequency
characteristic of the head-related transfer characteristic acquired in advance for each angle,
which is obtained by the recognition unit. The frequency characteristic generated based on the
difference between the frequency characteristic of the head related to the recognized angle and
the frequency characteristic of the head related to the angle having a predetermined relationship
with the angle. Do.
[0010]
Further, the present invention is a signal processing method used in a speaker array device
having a plurality of channels for processing audio signals, and supplying the audio signals of the
respective channels to a plurality of speakers and outputting as directional sound. A directivity
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control process for controlling the directivity of the sound related to each channel so as to
generate one or more sets of channels having substantially the same directivity in the plurality of
channels; And, in any one of the channels, a frequency characteristic giving process for giving a
frequency characteristic to change a sound image localization position.
[0011]
Further, according to the present invention, there is provided a computer having a plurality of
channels for processing audio signals, wherein audio signals of the respective channels are
supplied to a plurality of speakers to output as directional sound. Directivity control means for
controlling the directivity of the sound related to each channel so as to generate one or more sets
of channels having substantially the same directivity, and any one of the channels of the
substantially same directivity set Provided is a program for functioning as frequency
characteristic giving means for giving a frequency characteristic that changes a sound image
localization position in a channel.
[0012]
According to the present invention, it is possible to provide a speaker array device, a signal
processing method, and a program capable of obtaining a good surround effect even if the shape
of a room limits the direction of a sound image to be perceived by a listener.
[0013]
It is a block diagram showing composition of a speaker array device concerning an embodiment.
It is a block diagram showing the appearance of the speaker array device concerning an
embodiment.
It is a block diagram showing processing of an audio signal in a speaker array device concerning
an embodiment.
It is an explanatory view showing a course of a beam of sound outputted from a speaker array
device concerning an embodiment.
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It is explanatory drawing about a listener and the angle of a sound source direction.
It is explanatory drawing which shows the path of the beam of the sound output from the
conventional speaker array apparatus.
[0014]
Hereinafter, an embodiment of the present invention will be described.
[0015]
<Embodiment> The speaker array device 1 according to the embodiment of the present invention
is an audio configured by a plurality of channels (C: center, FL: front Lch, FR: front Rch, SL: rear
Lch, SR: rear Rch). The signal Sin is input, and the sound relating to each channel can be beamed
and output in the direction corresponding to each channel.
Hereinafter, the configuration of the speaker array device 1 will be described.
[0016]
FIG. 1 is a block diagram showing the configuration of the speaker array device 1.
FIG. 2 is an external view of the speaker array device 1.
The control unit 3 includes a central processing unit (CPU), a digital signal processor (DSP), a
random access memory (RAM), and the like, and executes a control program and the like stored
in the storage unit 4 via the bus 10. Then, each unit of the speaker array device 1 is controlled to
realize each function such as performing audio processing on an audio signal of each channel
constituting an audio signal Sin described later.
[0017]
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The storage unit 4 is a storage unit such as a ROM (Read Only Memory) or a hard disk, and
stores setting parameters and the like in addition to the control program described above. The
setting parameter is, for example, a parameter related to the frequency characteristic set as
described later, a parameter related to the delay amount in the delay unit, and the like.
[0018]
The operation unit 5 is a volume for adjusting the volume level and operation means for
inputting an instruction to change the setting, and outputs a signal indicating the content of the
operation to the control unit 3. The interface 6 is an input terminal or the like for obtaining an
audio signal from the outside, and in this example, an audio signal Sin configured by a plurality
of channels is input.
[0019]
The speaker array unit 2 is provided on the front surface of the speaker array device 1, and as
shown in FIG. 2, a plurality of substantially nondirectional speakers 20-1, 20-2,. 20-n (hereinafter
referred to as "speakers 20" when the respective speakers are not distinguished). The beaming of
the sound output is realized by the sound emission from the speaker array unit 2, and the
directivity direction can be controlled in the plane in which each speaker 20 is disposed.
[0020]
Next, sound processing performed on the audio signal of each channel will be described with
reference to FIG. FIG. 3 is an explanatory drawing showing the flow of processing from the input
of the audio signal of each channel to the emission of sound from each speaker 20. As shown in
FIG.
[0021]
The frequency characteristic assigner (EQ) 11-SL imparts the predetermined frequency
characteristic to be set to the audio signal of the channel SL. Details of the predetermined
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frequency characteristics to be set will be described later. Similarly, with respect to the frequency
characteristic imparting units 11-FL, 11-FR, and 11-SR, the frequency characteristics to be set
are respectively imparted to the audio signals of the channels FL, FR, and SR.
[0022]
The directivity control unit (DirC) 12 -SL has a delay unit corresponding to each speaker 20. Also,
the audio signal of the channel SL to which the frequency characteristic is given by the frequency
characteristic assigning unit 11 -SL is supplied to n signal lines corresponding to each speaker
20. At this time, the delay unit delays the audio signal supplied to the signal line corresponding
to each speaker 20, respectively. This delay is respectively determined so that the sound beam
relating to the channel SL is output in the set pointing direction. In this way, the directivity of the
sound beam relating to the channel SL is controlled.
[0023]
Similarly to the directivity control unit 12-SL, the directivity control units 12-FL, 12-C, 12-FR, and
12-SR also have audio signals of respective channels corresponding to n signal lines
corresponding to the respective speakers 20. The audio signal supplied to each signal line is
delayed so that the beam of sound supplied and output for each channel is output in the set
directivity direction.
[0024]
The addition unit 13-1 adds audio signals supplied from the directivity control units 12-SL, 12FL, 12-C, 12-FR, and 12-SR to the signal line corresponding to the speaker 20-1.
Similarly, for the adding units 13-2, 13-3, ..., 13-n, audio signals supplied to signal lines
corresponding to the respective speakers 20-2, 20-3, ..., 20-n. Add each one.
[0025]
The D / A converters 14-1, 14-2, ..., 14-n perform D / A conversion on the audio signals added by
the adding units 13-1, 13-2, ..., 13-n. .
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[0026]
The amplification units 15-1, 15-2, ..., 15-n amplify the audio signal D / A converted in the D / A
converters 14-1, 14-2, ..., 14-n. , 20-2,..., 20-n to emit sound.
Thus, the beam of sound relating to each channel emitted from the speaker array unit 2 is output
in the set directivity direction. The above is the description of the configuration of the speaker
array device 1.
[0027]
Next, the operation of the speaker array device 1 will be described. The speaker array device 1 is
disposed at a position as shown in FIG. 4A when the room 100 to be installed is viewed from the
top (near the wall surface in the top of the figure).
[0028]
First, the listening position of the listener 200 and the shape of the room 100 are set in the
speaker array device 1. This setting may be performed by operating the operation unit 5 and
inputting these pieces of information, or a beam of various sounds is output from the speaker
array device 1 and collected by the microphone installed at the listening position. It may be set
automatically by automatic measurement such as
[0029]
As described above, the control unit 3 determines the directivity direction for causing the beam
of sound according to each channel to reach the listening position by calculating from the set
listening position and the shape of the room 100, and the corresponding channel The directivity
control units 12-SL, 12-FL, 12-C, 12-FR, and 12-SR are set. Here, from the relationship between
the listening position and the shape of the room 100, for a channel for which the pointing
direction for causing the sound beam to reach the listening position can not be determined, the
same pointing direction as the pointing direction determined for other channels. Set
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[0030]
The other channels in this case are the same as the left / right relationship: the front channel is
the rear channel, and the rear channel is the front channel. For example, with the positional
relationship as shown in FIG. 4A, the pointing direction can not be determined for the channels
SL and SR. Therefore, the directivity direction of channel FL is set in directivity control unit 12-SL
corresponding to channel SL, and the directivity direction of channel FR is set in directivity
control unit 12-SR corresponding to channel SR. Be done. That is, the channel SL and the channel
FL are generated as a set of the same directivity (directed direction), and the channel SR and the
channel FR are generated as a set of the same directivity (directed direction).
[0031]
On the other hand, if the positional relationship is as shown in FIG. 4B, the directivity direction
can not be determined for the channels FL and FR. The directivity direction is set, and the
directivity direction of the channel SR is set in the directivity control unit 12-FR corresponding to
the channel FR. The same directivity refers to substantially the same directivity, and is not limited
to the completely matched directivity, as long as the sound beam substantially reaches the
listening position.
[0032]
Next, by calculating from the pointing direction, the control unit 3 recognizes, as an angle, the
direction in which the beam of sound relating to each channel for which the pointing direction
can not be determined reaches the listening position. In this example, the angle to be recognized
is an angle corresponding to α shown in FIG. This angle α assumes that the listener 200 at the
listening position faces the direction of the speaker array device 1, and the front direction P of
the listener 200 and the reaching direction of the sound beam (the reflection position of the wall
surface seen from the listening position Direction) (0 ° to 180 °).
[0033]
The control unit 3 sets the frequency characteristics given by the frequency characteristic giving
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units 11-SL, 11-FL, 11-FR, and 11-SR based on the angle α thus recognized. Here, a channel
relating to the recognized angle α, that is, a channel for which the pointing direction could not
be determined (in the case of FIG. 4A, the channel SL, SR, in the case of FIG. 4B, the channel FL,
For FR), the frequency characteristics as described below are set, and the other channels are set
as flat frequency characteristics. The frequency characteristics set based on the angle α will be
described below.
[0034]
First, the auditory mechanism of the sound image localization recognition in the horizontal
direction of the listener 200 will be described. There are mainly three types of mechanisms for
human localization and recognition of sound images. First, there is a time difference until the
sound output from a predetermined sound source reaches the listener's right ear 201-R and left
ear 201-L, that is, the time difference between both ears, which is dominant in the low frequency
band It is. The second is a sound pressure difference between both ears, which becomes
dominant at a frequency of approximately 1 kHz or more. The third is a change in frequency
characteristics due to interference that occurs when moving around the head or body of the
listener 200, and mainly affects the median plane, that is, the front / back judgment.
[0035]
For example, as shown in FIG. 5, the sound source 350 disposed at a symmetrical position with
respect to a symmetry line M connecting the sound output from the sound source 350-F and the
right ear 201-R and the left ear 201-L. The sound output from -R is the same as the time
difference between both ears and the sound pressure difference between both ears. Therefore,
since the listener 200 performs the identification of the positions of the sound sources 350 -F
and 350 -R based on only the difference in frequency characteristics, an illusion is likely to occur
in sound image localization recognition.
[0036]
Therefore, the difference H (β) / H of head-related transfer characteristics corresponding to the
sound sources 350-F and 350-R (hereinafter referred to as the characteristics of only the
frequency domain of the sound signal transfer characteristics from the sound source to the
listener's ear) When the audio signal given (α) is emitted from the sound source 350 -F
corresponding to the angle α, the listener 200 recognizes that the sound image is localized to
the sound source 350 -R corresponding to the angle β It will be.
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[0037]
Here, H (α) is a head-related transfer characteristic corresponding to the sound source 350-F at
the angle α, and H (β) is a head-related transfer characteristic corresponding to the sound
source 350-R at the angle β.
Since the sound source 350-F and the sound source 350-R are symmetrical with respect to the
symmetry line M, α and β have a relationship of α + β = 180 °. Therefore, the difference H
(β) / H (α) of head-related transfer characteristics is expressed as H (180 ° −α) / H (α). In
these head-related transfer characteristics, microphones are installed at the positions of the right
ear 201-R and the left ear 201-L of the listener 200, and the sounds from the respective sound
sources 350-F and 350-R are collected. You just need to get it.
[0038]
Then, for example, the head-related transfer characteristic H (α) is acquired in advance for the
angle α every 5 ° from 10 ° to 170 ° in the storage unit 4, and H (180 ° −α) / H (H)
Parameters related to the frequency characteristic F (α) corresponding to α) are stored. The
frequency characteristic F (α) may be the frequency characteristic of the difference H (180 °
−α) / H (α) of the head-related transfer characteristic itself, or only the characteristic small
number of peaks and dips are reproduced. It may be frequency characteristics. That is, the
frequency characteristic may be generated based on the difference H (180 ° −α) / H (α) of
the head-related transfer characteristics and change the sound image localization position.
[0039]
The control unit 3 recognizes the angle α of the channel for which the pointing direction can not
be determined as described above, and the frequency characteristic assigning units 11-SL, 11-FL,
11-FR, and the like corresponding to the channel. The frequency characteristic F (α) is set to 11SR. For example, in the case of FIG. 4A, when both the angles α corresponding to the channels
SL and SR are 55 °, the frequency characteristics F (55 °) are applied to the frequency
characteristics application units 11-SL and 11-SR. ) (Corresponding to the difference H (125 °) /
H (55 °) of head-related transfer characteristics) is set, and flat frequency characteristics are set
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in the frequency characteristics assignment units 11-FL and 11-FR.
[0040]
On the other hand, in the case of FIG. 4B and when the angles α corresponding to the channels
FL, FR are both 120 °, the frequency characteristics F (120 ° ) (Corresponding to the
difference H (60 °) / H (120 °) of head-related transfer characteristics) is set, and flat
frequency characteristics are set in the frequency characteristic applying units 11-SL and 11-SR.
As described above, the frequency characteristic F (α) is given to any one channel among the
channels having the same directivity.
[0041]
In the case shown in FIG. 4A, when the angles α corresponding to the channels SL and SR are
not the same, for example, the angle α corresponding to the channel SL is 40 ° and the angle
α corresponding to the channel SR is When the angle is 60 degrees, frequency characteristics F
(40 degrees) and F (60 degrees) are set in the frequency characteristic adding units 11-SL and
11-SR, respectively. That is, the left and right channels do not have to be at the same angle α.
[0042]
In this manner, the control unit 3 sets the directivity direction to the directivity control units 12SL, 12-FL, 12-C, 12-FR, and 12-SR, and the frequency characteristic addition units 11-SL, 11 Set
the frequency characteristics to -FL, 11-FR, 11-SR.
[0043]
In the case of the positional relationship as shown in FIG. 4A, the beams of sound relating to the
channels FL and SL output from the speaker array device 1 reach the listening position through
the same path.
Also, the sound beams relating to the channels FR and SR reach the listening position along the
same route. At this time, for the channels SL and SR, the frequency characteristic F (α) is given,
so for the listener 200, the direction as indicated by the broken line with respect to the sound
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related to the channels SL and SR (with respect to the symmetry line M It is perceived that the
sound is emitted from a symmetrical direction), and the sound image is localized to the rear even
with only the sound beam from the front.
[0044]
Further, in the case of the positional relationship as shown in FIG. 4B, the beam of sound relating
to the channels FL and SL output from the speaker array device 1 reaches the listening position
through the same path. Also, the sound beams relating to the channels FR and SR reach the
listening position along the same route. At this time, the frequency characteristics F (α) are
given to the channels FL and FR. Therefore, for the listener 200, a direction (a line of It is
perceived that the sound is emitted from a symmetrical direction), and the sound image is
localized to the front even with the sound beam from behind.
[0045]
Thus, the speaker array device 1 according to the embodiment of the present invention assigns a
predetermined frequency characteristic generated based on head-related transfer characteristics
to an audio signal of a channel whose directivity direction to be set can not be determined. Do.
Then, the sound image localization position given the predetermined frequency characteristic can
be changed in a direction different from the arrival direction of the sound beam by outputting as
a beam of sound of the same directivity in another channel. Therefore, even if the path of the
sound beam is limited depending on the shape of the room 100, the listening position, etc., the
sound image is localized in front of and behind the listener 200 by changing the sound image
localization position, and a good surround is obtained. You can get the effect.
[0046]
Although the embodiments of the present invention have been described above, the present
invention can be implemented in various aspects as follows.
[0047]
<Modification 1> In the embodiment described above, the speakers 20 are arranged in a straight
line in a single line as shown in FIG. It may be an arrangement.
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For example, a plurality of straight speakers may be arranged in parallel. Also, speakers of
different diameters may be used depending on the frequency band of the audio signal. In this
case, the process in the embodiment may be performed on a specific frequency band including
the peaks and dips that are characteristic of head-related transfer characteristics.
[0048]
<Modification 2> In the embodiment described above, the delaying units of the directivity control
units 12-SL, 12-FL, 12-C, 12-FR, and 12-SR convert the beams of each channel into beams.
However, it may be realized by finite impulse response (FIR) filtering.
[0049]
<Modification 3> The control program in the embodiment described above is a computer
readable recording medium such as a magnetic recording medium (magnetic tape, magnetic disk,
etc.), an optical recording medium (optical disc, etc.), a magneto-optical recording medium, a
semiconductor memory, etc. It can be provided in a stored state.
In addition, it is also possible to provide a communication unit connectable to the network and
download it via the network such as the Internet.
[0050]
DESCRIPTION OF SYMBOLS 1 ... Speaker array apparatus, 2 ... Speaker array part, 3 ... Control
part, 4 ... Storage part, 5 ... Operation part, 6 ... Interface, 11-SL, 11-FL, 11-FR, 11-SR ... Frequency
characteristic provision 12, 12-SL, 12-FL, 12-C, 12-FR, 12-SR ... directivity control unit, 13-1 to
13-n ... addition unit, 14-1 to 14-n ... D / A converter , 15-1 to 15-n: amplification unit, 20-1 to
20-n: speaker, 100: room, 200: listener, 201-L: left ear, 201-R: right ear, 300-SL, 300 -FL, 300FR, 300-SR ... Virtual speaker, 350-F, 350-R ... Sound source, 1000 ... Conventional speaker array
device
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