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JP2006262290

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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
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DESCRIPTION JP2006262290
PROBLEM TO BE SOLVED: To perform multi-channel audio reproduction capable of performing
good multi-channel audio reproduction without the need to route long signal lines for driving a
speaker to a room without being subject to the restriction of a room. SOLUTION: A speaker array
system 10 which outputs audio signals of a plurality of channels as acoustic beams of a plurality
of channels having a direction set for each channel, and converts the collected sound into an
electric signal and then outputs it as a sound. Rear channel audio reproduction units 20L and
20R are arranged opposite to each other across the listener P in the acoustic space, and the
acoustic beams of the channels C, FL and FR outputted from the speaker array system 10 are
reflected directly or to the wall to be a listener P is caused to reach the listener P as sound by
causing sound beams of the channels RL and RR to be collected by the rear channel audio
reproduction units 20L and 20R. [Selected figure] Figure 1
Multi-channel audio reproduction system and multi-channel audio reproduction method
[0001]
The present invention relates to a multi-channel audio reproduction system and multi-channel
audio reproduction method for forming a sound field surrounding a listener.
[0002]
The multi-channel audio reproduction system can provide the listener with a realistic sound by
emitting sounds from a plurality of speakers arranged in front of and behind the listener.
10-05-2019
1
In a conventional multi-channel audio reproduction system, speakers are disposed before and
after a listener, and output signals of respective channels of an audio amplifier are supplied to
the respective speakers via signal lines. For this reason, there is a problem that the signal line
connecting the audio amplifier and the speaker behind the listener placed away from this
particularly becomes long, and the signal line becomes an obstacle. In order to solve the problem
of the signal line, there is a multi-channel audio reproduction system adopting an infrared signal
method or an electric wave method wireless signal transmission means as an audio signal
transmission means connecting an amplifier and a speaker. Besides this, a directional sharp
speaker array is placed in front of the listening position, and the acoustic beam output from this
speaker array is reflected by the wall of the acoustic space to reach the listening position, and
used instead of the rear speaker Multichannel audio playback system. The multi-channel audio
reproduction system using the latter speaker array is disclosed, for example, in Patent Document
1 or 2. JP-A-6-205496 JP-A-2004-179711
[0003]
By the way, the multi-channel audio reproduction system using infrared rays or radio waves does
not bother to let long signal lines pass through the room to supply audio signals to the speakers,
but converts audio signals to infrared rays or radio waves There is a problem that the structure
becomes complicated because it is necessary to provide the means for performing the conversion
on the amplifier side and the means for converting the infrared rays and the radio waves into the
audio signal on the speaker side. Also, when transmitting an audio signal using infrared as a
carrier, there is a problem that transmission distance and the environment in which transmission
is performed are restricted, and when transmitting an audio signal using a radio wave as a
carrier, the sound quality is degraded There is a problem that On the other hand, a multi-channel
audio reproduction system using a speaker array performs good multi-channel reproduction
depending on the room environment, such as the material of the wall, for example, to make the
audio reach the listening position using reflection by the wall. Was a problem.
[0004]
The present invention has been made in view of the above-described circumstances, and there is
no need to route long signal lines for sending audio signals to speakers to a room, and there are
few room restrictions, which is favorable. An object of the present invention is to provide a multichannel audio reproduction system and a multi-channel audio reproduction method capable of
performing multi-channel audio reproduction.
10-05-2019
2
[0005]
According to the present invention, a speaker array for outputting audio signals of a plurality of
channels as acoustic beams of a plurality of channels having directions set for each channel, and
an acoustic beam of a part of channels among acoustic beams of the plurality of channels are
collected. There is provided a multi-channel audio reproduction system comprising: audio output
means for producing sound and outputting as sound.
Further, according to the present invention, a speaker array for outputting audio signals of a
plurality of channels as acoustic beams of a plurality of channels having a direction set for each
channel, and a picked up sound is converted into an electrical signal and then output as a sound.
The audio output means is disposed opposite to each other in the acoustic space across the
listening position, and the acoustic beam of all or part of the channels output from the speaker
array is reflected directly or on the wall surrounding the acoustic space to reach the listening
position The multi-channel audio reproducing method is characterized in that sound beams of
some channels are picked up by the audio output means to reach the listening position or
another listening position as sound. According to this invention, it is not necessary to route a
long signal line for sending an audio signal to the speaker to the room, and good multi-channel
audio reproduction can be performed according to the room condition.
[0006]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a diagram showing a configuration example of a multi-channel audio
reproduction system according to an embodiment of the present invention. The multi-channel
audio reproduction system according to the present embodiment is composed of a speaker array
system 10 and two rear channel audio reproduction units 20L and 20R. In the example shown in
FIG. 1, the multi-channel audio reproduction system is provided in a rectangular room
surrounded by walls WA, WB, WC and WD, and the speaker array system 10 is a wall in front of
the listener P The rear channel audio playback unit 20L is located at the center of the front of the
WA, to the left of the rear wall WC behind the listener P, and the rear channel audio playback
unit 20R is at the front of the wall WC It is arranged.
[0007]
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3
The speaker array system 10 reproduces each audio signal of center channel C, front left channel
FL, front right channel FR, rear left channel RL and rear right channel RR, and generates an
acoustic beam from the audio signal of each of these channels The system outputs the acoustic
beam of each channel in different directions. Several patterns are prepared in this embodiment as
the patterns of the transmission path of the acoustic beam of each channel.
[0008]
In the first pattern, the acoustic beam of the center channel C arrives directly from the speaker
array system 10 to the listener P on the front thereof, and the acoustic beam of the front channel
FL (FR) passes through the reflection by the wall WB (WD) to the listener P is reached, and the
acoustic beam of the rear channel RL (RR) reaches the listener P (not shown) via reflection by the
wall WB (WD) and reflection by the wall WC. In the second pattern, the acoustic beam path of
each of the C, FL, and FR channels is similar to that of the first pattern, but the acoustic beams of
the rear channels LR and RR are respectively reproduced from the speaker array system 10 as
rear channel audio reproduction. Reach units 20L and 20R directly. Also, in the third pattern, the
acoustic beam paths of the C, FL, and FR channels are the same as in the first pattern, but the
acoustic beam of the rear channel LR (RR) is output from the speaker array system 10
Thereafter, the light beam is reflected by the wall WB (WD) to reach the rear channel audio
reproduction unit 20L (20R).
[0009]
The speaker array system 10 receives, from the listener P, a command to select one of the
various patterns exemplified above, and executes processing for generating an acoustic beam of
each channel to be transmitted according to such a pattern. The details of the configuration for
performing such processing will be described later.
[0010]
The rear channel audio reproduction unit 20L (20R) is used when the second pattern or the third
pattern is selected among the above-described patterns. The rear channel audio reproduction
unit 20L (20R) is a device that picks up an acoustic beam of the rear channel RL (RR), converts it
to an electrical signal, and outputs it as an audio signal to the listener P.
10-05-2019
4
[0011]
Next, referring to FIG. 2, an example of the configuration of the speaker array system 10 will be
described. The speaker array system 10 includes a speaker array 1 in which n (n is plural)
nondirectional speaker units are arranged in a line or array, a center channel C, a front left
channel FL, a front right channel FR, Five signal processing units 2-k (k = 1) that process each
audio signal of the rear left channel RL and the rear right channel RR and generate one or more
delayed audio signals from each of the audio signals of the plurality of channels. And 5) and an
adder group 3.
[0012]
Here, the signal processing unit 2-k (k = 1 to 5) is, for example, a DSP, and the DSP performs
filtering processing 21 as processing corresponding to the signal processing unit 2-k (k = 1 to 5).
The time alignment process 22 and the directivity control process 23 are executed.
[0013]
As described above, in the present embodiment, a plurality of transmission path patterns of the
acoustic beam of each channel are prepared, but the transmission path and loss of the acoustic
beam of each channel are different among the patterns, and are the same. Even patterns are
different between channels.
The filtering 21 is a means for compensating for the loss of the transmission path of the acoustic
beam of the channel in accordance with the selected pattern. Further, the time alignment process
22 is a means for compensating for the difference between the transmission time of the acoustic
beam among the channels in the selected pattern.
[0014]
In the directivity control process 23, a plurality of delayed audio signals for driving a plurality of
speaker units in the speaker array 1 are generated from the audio signal which has passed
through the filter process 21 and the time alignment process 22. Here, in directivity control
processing 23 of signal processing unit 2-k corresponding to a certain channel, the delay time
10-05-2019
5
between each delayed audio signal and the original audio signal is a speaker array previously
determined for that channel. It is determined based on the output direction of the acoustic beam
at 1 and the sharpness of its directivity. The adder group 3 adds together delayed audio signals
output from the directivity control processing 23 of the signal processing unit 2-k (k = 1 to 5)
corresponding to the same speaker unit, and drives each speaker unit. It is a device that outputs
as a signal.
[0015]
The user interface 4 includes a display unit for displaying various types of guidance information
and an operation unit for receiving a command from the user. The control unit 5 is a control
center that provides various types of guidance information to the user via the user interface 4
and receives a command from the user, and controls each unit in the speaker array system 10
according to the command. Among the processes performed by the control unit 5, there is a
parameter setting process for the signal processing unit 2-k (k = 1 to 5). The memory 6 stores
parameter groups to be referred to by the control unit 5 in the parameter setting process in
association with the various patterns described above. When a command for selecting a certain
pattern is given via the user interface 4, the control unit 5 reads out the parameter group of each
channel associated with the pattern from the memory 6, and uses this to read each channel. The
parameters of the corresponding signal processing unit 2-k (k = 1 to 5) are set.
[0016]
The parameter group set by the parameter setting process includes a parameter for the filter
process 21, a parameter for the time alignment process 22, and a parameter for the directivity
control process 23. The contents of these parameters differ not only between channels but also
between patterns.
[0017]
For example, consider a first pattern and a second pattern. In the first pattern, the acoustic beam
of the rear channel RL (RR) reaches the listener P via reflection by the wall WB (WD) and
reflection by the wall WC (WC). Therefore, for the filtering process 21 of the rear channel RL
(RR), a parameter for the filtering process that compensates for the loss due to the reflection on
the wall over twice is stored in the memory 6 in association with the first pattern. . On the other
10-05-2019
6
hand, in the second pattern, the acoustic beam of the rear channel RL (RR) reaches the rear
channel audio reproduction unit 20L (20R), from which it becomes a sound and reaches the
listener P. In the filtering 21 of the rear channel RL (RR) in this second pattern, it is not necessary
to take into account the losses due to reflections at the walls. Therefore, parameters for filter
processing in consideration of other transmission characteristics are stored in the memory 6 in
association with the second pattern.
[0018]
Also, when comparing the first pattern and the second pattern, the difference between the
channels in the time required for the acoustic beam to be output from the speaker array 1 and
finally reach the ear of the listener P as a sound, especially the rear channel RL The difference in
required time between (RR) and the center channel C is largely different. For this reason, the
memory 6 stores different time alignment amounts of each channel between the first pattern and
the second pattern. Also, as apparent from FIG. 1 when comparing the first pattern and the
second pattern, the output directions of the acoustic beam of the rear channel RL (RR) are
completely different. In addition, the first pattern and the second pattern differ in the required
sharpness of the directivity of the acoustic beam. First, in the first pattern, since the acoustic
beam of the rear channel RL (RR) transmits the reflection on the wall by 2 degrees to the listener
P, it is preferable that the directivity be less sharp. On the other hand, in the second pattern,
since it is necessary to cause the rear channel audio reproduction unit 20L (20R) to receive the
rear channel audio reproduction unit 20L (20R) with low loss, the acoustic beam at the time of
reception in the same channel It is required to sharpen the directivity so that the spot diameter
of. For this reason, the first pattern and the second pattern are stored in the memory 6 as
parameters for the directivity control process 23, which are different among the patterns.
[0019]
Next, the configuration of the rear channel audio reproduction unit 20L (20R) will be described
with reference to FIG. As shown in FIG. 3, the rear channel audio reproduction unit 20L (20R)
includes a microphone 201, an A / D converter 202, a DSP 203, an amplifier 204, and a speaker
205. The microphone 201 picks up the acoustic beam of the rear channel RL (RR) and outputs it
as an analog signal. The A / D converter 202 samples this analog signal and outputs it as a digital
signal. The DSP 203 is a device that subjects the digital signal to digital signal processing
according to the room environment and the position of the listener P. As this digital signal
processing, for example, equalizer processing that adjusts the frequency characteristic of the
sound wave to be output to the listener P in accordance with the distance from the rear channel
10-05-2019
7
audio reproduction unit 20L (20R) to the position of the listener P or the size of the room and so
on. The amplifier 204 is a digital amplifier that generates a pulse train PWM-modulated by a
digital signal output from the DSP 204 and drives the speaker 205 by this pulse train.
Considering the ease of installation, the rear channel audio playback unit 20L (20R) is preferably
an integrated type in which the above components are housed in one case, but only the speaker
205 may be separate. Furthermore, in addition to the speaker 205, the microphone 201 may be
separate. The above is the details of the configuration of the multi-channel audio reproduction
system according to the present embodiment.
[0020]
According to this embodiment, the user can select an appropriate pattern and perform multichannel audio reproduction according to the room environment. For example, if there is little loss
in the wall and the room environment is good, the user is given a command to the speaker array
system 10 to select the first pattern without placing the rear channel audio playback units 20L
and 20R in the room. Just do it.
[0021]
On the other hand, the acoustic beam of at least one of the rear channels RL or RR can not be
reflected to the wall to reach the listener P, for example because there is a thick curtain in front
of the wall WB, WC or WD. There is a case. In that case, the user may arrange the rear channel
audio reproduction units 20L and 20R in the room as shown in FIG. 1 and give the speaker array
system 10 a command for selecting the second pattern or the third pattern.
[0022]
When the second pattern is selected, the acoustic beam of the rear channel RL (RR) directly
reaches the rear channel audio reproduction unit 20L (20R), so that it is output by the speaker
array 1 and finally output as a listener P as listener P It has the advantage of low losses in the
process of reaching When the second pattern is selected, there is a loss due to one reflection by
the wall. However, in the second pattern, the acoustic beam of the rear channel RL (RR) travels
relatively to the center of the room, whereas in the third pattern, the acoustic beam of the rear
channel RL (RR) travels to the wall of the room . Therefore, the third pattern is useful when there
is an obstacle near the center of the room and the second pattern can not be used.
10-05-2019
8
[0023]
<Other Embodiments> Although the embodiments of the present invention have been described
above, various embodiments can be considered for the present invention besides these. For
example: (1) In the above embodiment, it is assumed that multi-channel audio reproduction is
performed with the listener P facing the speaker array system 10. However, as shown in FIG. 4, it
may be possible for the listener P to enjoy audio reproduction with the back of the speaker array
system 10 turned on. Therefore, assuming such a situation, a pattern of the acoustic beam path
of each channel may be determined, and a group of parameters for realizing transmission of the
acoustic beam in this pattern may be stored in the memory 6. In the example shown in FIG. 4, in
the speaker array system 10, an acoustic beam is output using this parameter group. As the
pattern in that case, there may be the following two, both are illustrated in FIG. First, in one
pattern, the acoustic beam of the front channel FL (FR) from the speaker array system 10 directly
reaches the rear channel audio reproduction unit 20L (20R) on the front left side (front right
side) as viewed from the listener P. In the other pattern, the acoustic beam of the front channel
FL (FR) from the speaker array system 10 is reflected by the wall WD (WB) to reach the rear
channel audio reproduction unit 20L (20R).
[0024]
(2) In the embodiment shown in FIG. 5, two rooms, for example, the living 50 and the kitchen 60
are partially separated by a wall or an encoding curtain, etc., and both the living 50 and the
kitchen 60 have listeners. Here, the listener in the living room 50 can enjoy the multi-channel
audio reproduction described above by using the speaker array system 10 and the rear channel
audio reproduction units 20L and 20R. The feature of this embodiment is that the listener in the
kitchen 60 which is a separate room can enjoy the audio reproduction together with the listener
in the living room 50. In order to make this possible, the speaker array system 10 in this
embodiment is reflected on the wall as shown in the figure separately from the acoustic beam of
the center channel C that is output to the listener in the living room 50, and the kitchen 60 The
memory 6 stores parameters for outputting an acoustic beam of the center channel C which
arrives at the audio reproduction unit 20X for another room disposed at the entrance of the
memory. When this parameter group is read out by the control unit 5 and used for parameter
setting by the user's pattern selection, transmission of an acoustic beam as shown is performed.
The separate room audio reproduction unit 20X generates audio signals of the front channels FL
and FR from the collected sound beam of the center channel C, and outputs these to the kitchen
60 from the built-in left and right two-channel speakers.
10-05-2019
9
[0025]
(3) In the rear channel audio reproduction unit 20L (20R), the A / D converter 202, the DSP 203,
and the amplifier 204 are omitted, and the output signal of the microphone 201 is amplified by
the analog amplifier to drive the speaker 205. You may (4) In the speaker array system 10, the
output direction of the acoustic beam of each channel and the sharpness of directivity may be set
individually by the operation of the user interface 4.
[0026]
It is a figure which shows the structure of the multi-channel audio reproduction system which is
one Embodiment of this invention. It is a block diagram which shows the structure of the speaker
array system in the same system. It is a block diagram which shows the structure of the rear
channel audio reproduction unit in the same system. It is a figure which shows other
embodiment of this invention. It is a figure which shows other embodiment of this invention.
Explanation of sign
[0027]
10: Speaker array system, 20L, 20R: Rear channel audio reproduction unit, P: Listener, WA, WB,
WC, WD: Wall.
10-05-2019
10
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