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JP2014033266

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DESCRIPTION JP2014033266
Abstract: To provide a technology capable of automatically setting the sound emission direction
of an acoustic beam even when an acoustic reflector is used in a space in which a speaker array
device is disposed. A sound emitting device (11) turns and emits a test acoustic beam from a
speaker array (110), and is a collection showing a direct sound or a reflected sound of an
acoustic beam collected by a microphone (12) arranged at a listening position. In response to the
input of the sound signal, a sound pressure profile indicating the relationship between the sound
emission direction of the acoustic beam and the sound pressure level of the sound collection
signal is generated. The peak specification unit 1151 specifies the peak direction from the sound
pressure profile, and the direction setting unit 1152 selects the sound emission direction of the
acoustic beam of each of the plurality of channel sounds constituting the multi-channel surround
sound from among the peak directions. . The direction setting unit 1152 selects the sound
emission direction of the acoustic beam according to different rules according to the presence or
absence of the acoustic reflection plate identified by the acoustic reflection plate presence /
absence identification unit 1153. [Selected figure] Figure 1
Sound emission device
[0001]
The present invention relates to a sound emitting apparatus for playing multi-channel sound by
emitting a plurality of acoustic beams in different directions by a speaker array having a plurality
of speakers.
[0002]
By using a speaker array having a plurality of speakers arranged in a matrix, each speaker of a
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plurality of channels constituting multi-channel sound is emitted as an acoustic beam in a
different direction, thereby a single speaker array There is a sound emitting device (hereinafter
referred to as a "speaker array device") that enables multi-channel sound reproduction.
[0003]
A part of the acoustic beam emitted from the speaker array device is reflected once or more to
the wall defining the outer edge of the space where the speaker array device is disposed, and
then the direction of the speaker array device is viewed from the listener Reach the listener from
different directions.
FIG. 14 is a diagram showing a path for an acoustic beam emitted from the speaker array device
to reach the listener.
The shape of the space SP shown in FIG. 14 is rectangular when viewed from above, and the wall
surface WF on the front side, the wall surface WL on the left side, the wall surface WB on the
rear side, the wall surface WR on the right side, and the floor And its ceiling (not shown) defines
its outer edge. In the space SP, the sound emitting device 91, which is a speaker array device, is
disposed at the center position in the left-right direction close to the wall surface WF so that the
sound emitting surface of the speaker is parallel to the wall surface WF.
[0004]
The sound emitting device 91 has an angle θ1 with the direction of the left half line viewed from
the listener U of the base line B parallel to the sound emitting surface of the sound emitting
device 91 as a reference direction (0 degree direction) on the horizontal surface. Direction,
direction of angle θ2, direction of angle θ3, direction of angle θ4, direction of angle θ5
(however, 0 degrees <θ1 <θ2 <θ3 <θ4 <θ5 <180 degrees), 5.1 channel multi surround
channel Sound of front left channel (hereinafter referred to as “Lch”), sound of surround left
channel (hereinafter referred to as “SLch”), center channel (hereinafter referred to as “Cch”),
surround right channel (hereinafter referred to as “Cch”) Hereinafter, the sound of "SRch" and
the sound of the front right channel (hereinafter, "Rch") are emitted as acoustic beams.
[0005]
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Note that the sound of a low sound effects channel (hereinafter referred to as "LFEch")
constituting the 5.1 surround sound of multiple surround channels is emitted from the sound
emitting apparatus 91 without being converted to an acoustic beam. .
Therefore, the description of the processing relating to the sound signal of LFEch in the present
application is omitted.
[0006]
The Lch and Rch acoustic beams emitted in the directions of the angles θ1 and θ5 are reflected
by the wall WL or the wall WR and reach the listener U from the left front and the right front,
respectively. Therefore, the listener U perceives as if the sound of Lch from the (non-existent)
speaker 90L arranged at the left front is emitted from the (non-existent) speaker 90R arranged at
the right front. . Also, the SLch and RLch acoustic beams emitted in the directions of angle θ2
and angle θ4 are reflected twice by the wall WL or the wall WR and twice by the wall WB,
respectively, to the listener U from the left rear and the right rear, respectively. To reach.
Therefore, the listener U perceives the sound of the SLch from the (non-existent) speaker 90SL
arranged at the left rear as if the sound of the SRch is emitted from the (non-existent) speaker
90SR arranged at the right rear . Also, the acoustic beam of Cch emitted in the direction of the
angle θ3 directly reaches the listener U from the front. Therefore, the listener U perceives that
the sound of Cch is emitted from the speaker 90C disposed in front.
[0007]
As described above, the listener U can hear the multi-surround channel sound because he / she
hears the sound arriving from different directions.
[0008]
In order for the speaker array device to reproduce multi-surround channel sound as described
above, the sound emission direction of the acoustic beam of each channel needs to be set
correctly.
For example, Patent Document 1 is a document disclosing a technique for setting an angle of a
sound beam emitted from a speaker array device. In the speaker array device disclosed in Patent
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Document 1, a test sound beam is output while being turned from the speaker array, and direct
sound and reflected sound are collected by a microphone disposed at a listening position, thereby
to the turning angle of the beam. The signal level is measured, and a plurality of angles at which
the measured signal level peaks are identified. One of the turning angles thus specified is set as
the sound emission angle of the sound beam of each channel according to a predetermined rule.
[0009]
Patent 4127248 specification
[0010]
In order to reproduce multi-surround channel sound by the speaker array device, it is generally
necessary that a wall surface that reflects an acoustic beam emitted from the speaker array
device with low loss be present at a desired position.
In order to enable reproduction of multi-surround channel sound by the speaker array device
even in a room or the like in which no such wall exists, an acoustic reflector may be used. FIG. 15
is an external view of an example of the acoustic reflection plate as viewed from the back thereof.
The acoustic reflection plate is a plate that reflects sound with low loss, and is attached to the
stand with the horizontal direction perpendicular to the flat surface, and the acoustic beam
emitted from the speaker array device is an acoustic reflection plate. With the center position
adjusted to a suitable height between the height of the loudspeaker array device and the height
of the listener's head to reflect and reach the listener's head, the loudspeaker array device is It is
arranged in the arranged space. If the listener lacks a desired wall surface that reflects the
acoustic beam of a certain channel, an acoustic reflector is placed in the sound emission direction
of the acoustic beam to compensate for the missing wall surface, thereby allowing multiple
surround channels by the speaker array device. Sound can be played back.
[0011]
The acoustic reflector can be placed at any position in the space where the speaker array device
is placed. Therefore, for example, when using the automatic setting function of the sound
emission direction of the acoustic beam provided in the speaker array device proposed in Patent
Document 1, if the acoustic reflection plate is used, the sound emission direction of the acoustic
beam is set correctly It may not be possible. For example, when part of the wall surface WR
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shown in FIG. 14 is missing as shown in FIG. 16, the sound of Rch reaches listener U even if the
sound beam of Rch is emitted in the direction of angle θ5. do not do. Therefore, in order to
reflect the acoustic beam of Rch, the listener U is assumed to arrange the acoustic reflection plate
RB at a position at an angle θ6 in front of the right. In this case, the speaker array device
determines that there is no path for the acoustic beam emitted in the direction of angle θ6 to be
reflected once on the wall WR and reach from the right front of the listener U, and the direction
of angle θ6 It may not be set as the direction of sound emission of the Rch acoustic beam.
[0012]
Therefore, conventionally, when an acoustic reflection plate is disposed in the space in which the
speaker array device is disposed, the user reflects the acoustic reflection even though the
speaker array device has a function of automatically setting the sound emission direction of the
acoustic beam. It was necessary to manually adjust the emitting direction of the acoustic beam of
the channel to be assigned to the plate.
[0013]
In view of the above circumstances, the present invention provides a technology capable of
automatically setting the sound emission direction of the acoustic beam even when the acoustic
reflection plate is disposed in the space where the speaker array device is disposed. The purpose
is
[0014]
In order to solve the above problems, the present invention outputs a sound signal to each of a
speaker array having a plurality of speakers and one or more of the plurality of speakers, and
controls the timing of the output of the sound signal. Sound signal output means for emitting an
acoustic beam in one or more directions from the speaker array; sound collection signal input
means for receiving a sound collection signal output from a microphone disposed at a listening
position; When the output means emits the test sound beam while changing the sound emission
direction to the speaker array, the direction data indicating the direction of the sound beam is
associated with the sound collection signal collected by the microphone. Storage means, and a
plurality of peaks in the sound collection signal based on the direction data and the sound
collection signal stored in association with each other in the storage means; Acoustic reflector
presence / absence identification which detects whether there is an acoustic reflection plate for
reflecting the acoustic beam emitted by the peak identification means which detects and specifies
the direction in each peak as the peak direction and the acoustic array emitted from the speaker
array And setting a peak direction selected according to a predetermined rule from among the
one or more peak directions specified by the peak specifying means for at least one of the
plurality of sound channels constituting the multi-channel sound A direction setting means, the
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direction setting means being different from the predetermined rule in a case where it is
specified by the acoustic reflector presence / absence specifying means that there is no acoustic
reflector and when it is specified that there is an acoustic reflector; To provide a sound emitting
device for setting the peak direction for the channel.
[0015]
According to such a sound emitting device, when the acoustic reflection plate is present in the
space where the sound emitting device is disposed, the sound emission direction of the acoustic
beam is specified according to a rule different from that in the case where the acoustic reflection
plate is not present. The assignment of channels to acoustic reflectors may be correctly and
automatically set.
[0016]
Further, in the above sound emitting device, the predetermined rule includes a predetermined
range in which the selected peak direction is to be included, and the direction setting unit is an
acoustic reflector by the acoustic reflector presence / absence specifying unit. A configuration
may be employed in which the predetermined range is expanded when it is identified as being
present.
[0017]
According to such a sound output device, when the acoustic reflection plate is present in the
space where the sound emission device is disposed, the sound emission direction of the acoustic
beam is selected within a wider range than when the acoustic reflection plate is not present.
Therefore, even if the acoustic reflector is disposed in a direction in which the acoustic beam can
not reach the listener in the reflection by the wall, the assignment of the channel to the acoustic
reflector can be set correctly and automatically.
[0018]
The sound emitting apparatus described above further includes an operation unit that receives
an input of data by the user by generating a predetermined signal according to an operation by
the user, and the acoustic reflection plate presence / absence specification unit is for the
operation unit. A configuration may be adopted in which whether or not an acoustic reflector is
present is specified based on the data input by the user.
[0019]
According to such a sound emitting device, since the presence or absence of the acoustic
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reflector is specified based on the data input by the user, assignment to the acoustic reflector of
the channel can be performed according to the user's intention.
[0020]
Further, in the above sound emitting apparatus, the acoustic reflection plate presence or absence
specifying means specifies that the acoustic reflection plate is present when at least one of the
peaks detected by the peak specifying means satisfies a predetermined condition. The
configuration may be adopted.
[0021]
According to such a sound emitting device, since the presence or absence of the acoustic
reflector is automatically specified, the channel assignment to the acoustic reflector is made
regardless of the presence or absence of the data input indicating the presence or absence of the
acoustic reflector by the user. It can be done.
[0022]
Further, in the above sound emitting device, the acoustic reflection plate presence / absence
specifying means is a region where the sound pressure level at one peak detected by the peak
specifying means is equal to or higher than a predetermined threshold, and forms the one peak.
A configuration may be adopted in which it is specified that an acoustic reflector is present in the
direction at the one peak when the width regarding the direction is equal to or less than a
predetermined threshold.
[0023]
According to such a sound emitting device, it is determined whether or not the peak is a peak
according to the acoustic reflection plate based on the characteristic of the detected peak, so that
the sound pressure level at the reflection is higher than that at the wall surface. It is possible to
specify with high accuracy the presence or absence of an acoustic reflector whose loss is small
and the width (the length in the lateral direction) does not change by a predetermined value.
[0024]
BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows schematic structure
of the sound emission system concerning 1st Embodiment of this invention.
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It is the figure which showed typically the example of arrangement | positioning of the speaker in
the speaker array concerning 1st Embodiment of this invention.
It is a figure for demonstrating the mechanism in which the sound emission apparatus
concerning 1st Embodiment of this invention specifies the sound emission direction of an
acoustic beam.
FIG. 6 illustrates an example of an undesirable transmission path of an acoustic beam from a
sound emitting device to a listening position.
FIG. 6 illustrates an example of an undesirable transmission path of an acoustic beam from a
sound emitting device to a listening position.
It is the figure which showed the example of a setting in the sound reflection board setting
screen which the sound emission apparatus concerning 1st Embodiment of this invention
displays.
It is a figure for demonstrating the mechanism in which the sound emission apparatus
concerning 1st Embodiment of this invention specifies the sound emission direction of an
acoustic beam.
It is a figure for demonstrating the mechanism in which the sound emission apparatus
concerning 1st Embodiment of this invention specifies the sound emission direction of an
acoustic beam.
It is the figure which showed the example of a setting in the sound reflection board setting
screen which the sound emission apparatus concerning 1st Embodiment of this invention
displays.
It is a figure for demonstrating the mechanism in which the sound emission apparatus
concerning 1st Embodiment of this invention specifies the sound emission direction of an
acoustic beam.
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It is the figure which showed the example of a setting in the sound reflection board setting
screen which the sound emission apparatus concerning 1st Embodiment of this invention
displays.
It is a figure for demonstrating the mechanism in which the sound emission apparatus
concerning 1st Embodiment of this invention specifies the sound emission direction of an
acoustic beam.
It is the figure which showed the example of a setting in the sound reflection board setting
screen which the sound emission apparatus concerning 1st Embodiment of this invention
displays. It is a figure for demonstrating a mechanism. It is a figure showing a path which an
acoustic beam emitted from a speaker array device reaches a listener. It is an external view of an
acoustic reflection board. It is the figure which illustrated the situation where an acoustic
reflecting plate is needed.
[0025]
Embodiment FIG. 1 is a schematic diagram of a sound emitting system 1 including a sound
emitting device 11 according to an embodiment of the present invention and a microphone 12
used by the sound emitting device 11 to set the sound emitting direction of an acoustic beam. It
is a block diagram showing composition.
[0026]
The sound emitting apparatus 11 first includes a speaker array 110 that emits each of the
sounds of the plurality of channels constituting the multi-channel surround sound as sound
beams in different directions.
The speaker array 110 has n (n is an arbitrary natural number) speakers 1101 arranged in an
array, with the sound emitting surfaces aligned on the same surface. FIG. 2 is a view
schematically showing an arrangement example of the speakers 1101 in the speaker array 110.
As shown in FIG.
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[0027]
Also, the sound emitting device 11 includes a source sound signal input unit 111 that receives a
multi-channel surround sound signal encoded from an external device, and a decoder 112 that
decodes the multi-channel surround sound signal received by the source sound signal input unit
111. A sound signal output unit 113 that generates and outputs a sound signal for forming an
acoustic beam using a plurality of sound signals for each channel generated by the decoder 112,
and a sound signal output from the sound signal output unit 113 A DA converter 114 is provided
which converts a digital signal into an analog sound signal and outputs it to each of n speakers
1101 of the speaker array 110. In the following description, it is assumed that the multi-channel
surround sound signal received by the source sound signal input unit 111 from an external
device is 5.1 channel as an example. The processing related to the LFEch sound signal included
in the 5.1 channel multi-channel surround sound signal is omitted from the description as
described above, so the component related to the processing of the LFEch sound signal also in
FIG. The description is omitted.
[0028]
The outline of the mechanism of the sound signal output unit 113 generating a sound signal for
forming an acoustic beam will be described below. The sound signal output unit 113 includes n
processing blocks 1131 corresponding to each of the n speakers 1101. The sound signal output
unit 113 branches the sound signals of the five channels decoded by the decoder 112 into n, and
inputs the n sound signals to each of n processing blocks 1131.
[0029]
Each of the n processing blocks 1131 includes five delayers and five amplifiers corresponding to
five channels, and one adder for adding five sound signals after being amplified by the amplifiers,
The five sound signals thus obtained are each delayed by a delay, amplified by an amplifier,
added by an adder, and output to a DA converter 114. The DA converter 114 converts the sound
signal input from each of the n processing blocks 1131 into an analog signal, and then outputs
the analog signal to the speaker 1101 corresponding to the processing block 1131 of the input
source of the sound signal.
[0030]
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The delay time of the delay process performed by each of the five delay units included in each
processing block 1131 is the direction of the acoustic beam to be emitted from the speaker array
110 and the position at which the acoustic beam is to be focused (from the speaker array 110 It
depends on the distance). The amplification factor of the amplification performed by each of the
five amplifiers included in each processing block 1131 is determined according to the sound
pressure level of the acoustic beam to be emitted from the speaker array 110. The sound
emitting device 11 includes a control unit 115 that calculates the delay time and the
amplification factor (hereinafter, referred to as “sound beam forming parameter”) and sets
them in the sound signal output unit 113.
[0031]
As described above, in order for the control unit 115 to determine the acoustic beam forming
parameters, the direction of emission of the acoustic beam, the distance from the speaker array
110 to the focal point of the acoustic beam, and the sound pressure level at the time of emission
of the acoustic beam. , Needs to be identified. In the present embodiment of the present
application, the conventional technology can be used for specifying the distance from the
speaker array 110 to the focal point of the acoustic beam and the sound pressure level at the
time of sound emission of the acoustic beam. . Therefore, in the following, the explanation will be
made focusing on the mechanism of the sound emitting device 11 specifying the sound emitting
direction of the acoustic beam.
[0032]
FIG. 3 is a diagram for explaining a mechanism in which the sound emitting device 11 specifies
the sound emitting direction of the acoustic beam. The sound emitting device 11 emits sound so
as to turn an acoustic beam of a test sound (hereinafter, referred to as “testing acoustic beam”)
from the speaker array 110 as indicated by an arrow D in FIG. A sound collection signal
indicating a sound collected by the microphone 12 disposed at the position is received from the
microphone 12. As a result, as shown in FIG. 3 (B), the sound output device 11 has a relationship
between the sound emission direction of the test acoustic beam and the sound pressure level
indicated by the sound collection signal (hereinafter referred to as “sound pressure profile”).
Get the data shown. The sound output device 11 selects one suitable for the sound emission
direction of the acoustic beam of each channel according to a predetermined rule from among
the directions in which the sound pressure level shows a peak value in the sound pressure profile
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(hereinafter referred to as "peak direction") Do. Thus, the sound output device 11 determines the
sound emission direction of the acoustic beam of each channel.
[0033]
Specifically, first, the control unit 115 sequentially outputs a test sound signal indicating a test
sound to the sound signal output unit 113, and the sound emission direction of the acoustic
beam changes in the horizontal plane as time passes. The acoustic beam forming parameters that
are different momentarily are generated, and the generated acoustic beam forming parameters
are sequentially input to the sound signal output unit 113. The test sound signal is preferably a
sound signal capable of forming an acoustic beam, and a waveform signal that does not interfere
with each other even if the direct sound and the reflected sound overlap each other. For example,
a waveform signal having no periodicity centered on 4 kHz or a noise signal is suitable as a test
sound signal. The sound emitting apparatus 11 includes a storage unit 118 that stores various
data, and data indicating a test sound signal is also stored in the storage unit 118.
[0034]
The sound signal output unit 113 processes the test sound signal sequentially received from the
control unit 115 in accordance with the acoustic beam forming parameter sequentially received
from the control unit 115 and outputs the processed signal to each of the speakers 1101. As a
result, the test acoustic beam is emitted from the speaker array 110 while moving so as to turn
on the horizontal surface.
[0035]
The test acoustic beam emitted from the speaker array 110 as described above is reflected on the
wall directly or several times, and then reaches the microphone 12 arranged at the listening
position and collected to be converted into a collected signal It is input to the sound emitting
device 11.
[0036]
The sound output device 11 includes a sound collection signal input unit 116 that receives a
sound collection signal output from the microphone 12 and an AD converter 117 that converts
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the sound collection signal received by the sound collection signal input unit 116 from an analog
signal to a digital signal. ing.
The AD converter 117 delivers the collected sound signal converted into the digital signal to the
control unit 115.
[0037]
The control unit 115 outputs direction data indicating a sound emission direction of the test
sound beam instructed to the sound signal output unit 113 by the sound beam formation
parameter, and outputs the sound beam formation parameter from the AD converter 117. The
received sound collection signals are stored in the storage unit 118 in association with each
other.
[0038]
When the turning of the test acoustic beam is completed, the control unit 115 reads a plurality of
sets of direction data and sound collection signals stored in association with each other in the
storage unit 118 to generate a sound pressure profile.
FIG. 3B illustrates a graph of the sound pressure profile generated by the control unit 115. In the
graph of FIG. 3 (B), the horizontal axis indicates the direction of sound emission of the test
acoustic beam, and the vertical axis indicates the sound pressure level of the sound collection
signal. In the present embodiment, the direction of sound emission is specified by the angle that
increases counterclockwise on the horizontal surface with reference to the left direction of the
baseline B. In addition, the graph of FIG. 3 (B) is what the control part 115 removed and smooth |
blunted (The graph of the other sound pressure profile illustrated below is the same).
[0039]
Subsequently, the control unit 115 specifies a point at which the sound pressure level indicated
in the sound pressure profile indicates a peak value (hereinafter referred to as “peak point”),
and the sound of each channel is selected from the peak directions of the specified peak points.
Select the one that is suitable for the sound emission direction of the beam. The control unit 115
includes a peak specifying unit 1151 and a direction setting unit 1152 as a functional
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configuration unit for that purpose (see FIG. 1).
[0040]
The peak specifying unit 1151 analyzes the shape of the sound pressure profile graph, and after
the sound pressure level increases to a predetermined threshold or more with a change in
direction, a peak region is a region that draws a curve that decreases to a predetermined
threshold or less. Identify. In FIG. 3C, the areas indicated by A1 to A5 are peak areas identified by
the peak identification unit 1151. Subsequently, for each of the identified peak areas, the peak
identifying unit 1151 identifies a point at which the sound pressure level indicates the maximum
value as a peak point. P1 to P5 shown in FIG. 3C are peak points identified by the peak
identifying unit 1151.
[0041]
<When the Reflecting Plate is not Arranged> As in the example shown in FIG. 3A, when the
reflecting plate is not disposed in the room, the direction setting unit 1152 sets the rule
described below (hereinafter, “normal From among the peak points identified by the peak
identification unit 1151, a channel to be assigned to each peak point is determined according to
the “rule”. The normal rule is a rule that estimates the peak direction suitable for each channel,
assuming that the acoustic beam of the channel other than Cch reflects and transmits to the wall
of the room.
[0042]
(Peak direction assigned to Cch) Peak direction included in a predetermined range (for example,
60 degrees to 120 degrees) centered on 90 degrees in the peak direction in which the peak value
shows the maximum. (Peak direction assigned to Lch) The peak direction is included in a
predetermined range (for example, 30 to 50 degrees) close to the 0 degree side, and the peak
value is a predetermined ratio (for example 40%) of the peak value of the peak direction assigned
to Cch. ) Or more peak directions. (If there is more than one, the peak direction is close to 0
degrees.) (Peak direction assigned to Rch) The peak direction is included in a predetermined
range (for example, 130 degrees to 150 degrees) close to 180 degrees. Peak direction that is
equal to or greater than a predetermined ratio (for example, 40%) of peak values in the peak
direction allocated to Cch. (If there is more than one, the peak direction is close to 180 degrees.)
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(Peak direction assigned to SLch) The peak direction is a predetermined range (a range set 90
degrees to the side used to specify the Lch peak direction) Peak direction included in, for
example, 40 degrees to 60 degrees and having a peak value equal to or more than a
predetermined ratio (for example, 20%) of peak values in the peak direction allocated to Cch. (If
there is more than one, the peak value is the largest) (Peak direction assigned to SRch) The peak
direction is a predetermined range (a range set 90 degrees to the side used to specify the Rch
peak direction, For example, a peak direction included within 120 degrees to 140 degrees and
having a peak value equal to or more than a predetermined ratio (for example, 20%) of peak
values in the peak direction allocated to Cch. (If there is more than one, the peak value is the
largest)
[0043]
In the normal rule, the peak direction to be assigned to Lch is limited to a predetermined range
(for example, 30 to 50 degrees) close to the 0 degree side, and a range on the 0 degree side (for
example, 0 to 30 degrees) The reason for excluding is because the sound release direction of the
transmission path accompanied by two or more reflections as shown in FIG. 4 is not erroneously
assigned to Lch. The same applies to Rch.
[0044]
In addition, the peak direction assigned to SLch in a normal rule is limited to a predetermined
range (for example, 40 degrees to 60 degrees) set on the 90 degree side of the range used for
specifying the Lch peak direction, and the range The reason for excluding the range of 90
degrees side (for example, 60 degrees to 90 degrees) is that the sound release direction of the
transmission path accompanied by three or more reflections as shown in FIG. It is. The same
applies to SRch.
[0045]
In the case where the sound pressure profile is the example shown in FIG. 3C, the direction
setting unit 1152 assigns the following peak directions as the sound emission directions of the
acoustic beams of the respective channels in accordance with the above-described normal rule.
(Cch) Peak direction of peak point P3 (angle θ3) (Lch) Peak direction of peak point P1 (angle
θ1) (Rch) Peak direction of peak point P5 (angle θ5) (SLch) Peak direction of peak point P2
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(angle θ2) (SRch) Peak direction of peak point P4 (angle θ4)
[0046]
When the direction setting unit 1152 assigns the sound emission direction to each of the five
channels as described above, the acoustic beam forming parameters (for the sound emission
direction) for forming the acoustic beam of each channel in the sound emission direction are
Generate The acoustic beam forming parameters generated by the direction setting unit 1152
are set in the sound signal output unit 113.
[0047]
Thereafter, when the sound signal output unit 113 receives a sound signal from an external
device via the source sound signal input unit 111, the decoder 112 and the DA converter 114,
the sound signal is processed according to the set acoustic beam forming parameters. As a result,
the sound beam of Cch from the speaker array 110 is in the direction of angle θ3, the sound
beam of Lch is in the direction of angle θ1, and the sound beam of Rch is in the direction of
angle θ5. The beam is emitted in the direction of the angle θ2, and the acoustic beam of SRch is
emitted in the direction of the angle θ4. FIG. 3D shows a path through which the acoustic beam
emitted from the speaker array 110 reaches the listener U at the listening position.
[0048]
The sound emitting device 11 receives an input of data from the user's sound emitting device 11
by generating a predetermined signal according to the user's operation as shown in FIG. And a
display unit 120 for displaying characters and images to the user.
[0049]
<When the Acoustic Reflector is Arranged> When the acoustic reflector is arranged in the space
SP, the direction setting unit 1152 assigns the peak direction to each channel in accordance with
a rule different from the above-described regular rule.
[0050]
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In order to change the rule of assignment in the peak direction according to the presence or
absence of the acoustic reflection plate, the control unit 115 of the sound emitting device 11
includes the acoustic reflection plate presence / absence identification unit 1153 as a functional
component that identifies the presence or absence of the acoustic reflection plate. ing.
The acoustic reflector presence / absence identification unit 1153 identifies the presence /
absence of the acoustic reflector in the space SP based on the setting information of the acoustic
reflector input to the sound output device 11 by the user.
[0051]
FIG. 6 shows a screen (hereinafter referred to as “acoustic reflector setting screen”) for the
user to set a channel (hereinafter referred to as “channel allocated to the acoustic reflector”)
using the acoustic reflector to the sound emitting device 11. Is a diagram showing a call).
The acoustic reflection plate setting screen is displayed on the display unit 120 in accordance
with a predetermined operation on the operation unit 119 by the user. FIG. 6A is an acoustic
reflector setting screen showing the setting when no acoustic reflector is used for any of the
channels, and FIG. 6B is an acoustic showing the setting when using an acoustic reflector for
SLch. It is a reflecting plate setting screen. By operating the operation unit 119 while the acoustic
reflection plate setting screen is displayed, the user can change settings relating to the acoustic
reflection plate, for example, as shown in FIG. 6 (A) to FIG. 6 (B).
[0052]
FIG. 7 illustrates a procedure in which the sound emission device 11 assigns the sound emission
direction to each channel when the acoustic reflector RB for SLch is disposed at the left rear
position as viewed from the listening position in the space SP. FIG. As shown in FIG. 7A, in the
case where the acoustic reflection plate RB is disposed at the left rear position as viewed from
the listening position, a sound pressure profile as shown in FIG. 7B is obtained. In FIG. 7B, a peak
area A6 is a peak area corresponding to the acoustic reflection plate RB.
[0053]
03-05-2019
17
In the case where the setting of the acoustic reflector is shown in FIG. 6A (“no acoustic reflector
for all channels”) although the acoustic reflector RB is disposed for SLch, the acoustic reflector
The presence / absence identification unit 1153 identifies that there is no acoustic reflection
plate. The specific result is handed over to the direction setting unit 1152. When the direction
setting unit 1152 receives from the acoustic reflector presence / absence identification unit
1153 a specific result that there is no acoustic reflector, the direction setting unit 1152 allocates
the sound emission direction to each channel according to a general rule.
[0054]
As a result, even if the listener wishes to assign the acoustic reflection plate RB to the SLch, the
acoustic reflection plate RB is not necessarily assigned to the SLch. This is because the normal
rule is based on the assumption that the acoustic beams of all the channels other than Cch are
reflected by the wall of the room, and is not based on the assumption that the acoustic reflector
is used.
[0055]
Specifically, as shown in FIG. 7C, the direction setting unit 1152 selects, for example, within a
range of 40 degrees to 60 degrees among the peak directions specified by the peak specifying
unit 1151 in the selection of peak directions to be assigned to SLch. Choose one. Therefore, when
the acoustic reflection plate RB is disposed within a range of 60 degrees to 90 degrees as shown
in FIG. 7A, the direction setting unit 1152 is configured as shown in FIG. The peak direction
(angle θ2) of the peak point P2 is assigned to SLch, not the peak direction (angle θ6) indicating
the direction of.
[0056]
On the other hand, when the setting of the acoustic reflector is shown in FIG. 5B (“with acoustic
reflector with respect to SLch” and “without acoustic reflector with respect to other
channels”), the acoustic reflector presence / absence specification unit 1153 is for SLch Identify
that there is an acoustic reflector. The specific result is handed over to the direction setting unit
1152.
03-05-2019
18
[0057]
When the direction setting unit 1152 receives from the acoustic reflector presence / absence
identification unit 1153 a specific result that there is an acoustic reflector for SLch, the following
rule different from the usual rule (hereinafter referred to as “following” Use as described in
“Reflector assignment rule for SLch”. (Peak direction allocated to SLch) The peak direction is
included in a predetermined range (90 degrees on the side of the range used to specify the Lch
peak direction, for example, 40 degrees to 80 degrees), and the peak value A peak direction that
is equal to or greater than a predetermined ratio (for example, 60%) of peak values in the peak
direction assigned to Cch. (If there is more than one, the peak value is the largest)
[0058]
That is, in the reflector assignment rule for SLch, the range of selection of the peak direction is
expanded to the 90 degree side as shown in FIG. 7E as compared with the normal rule. This is
because the direction of the acoustic reflector RB for SLch viewed from the speaker array 110
has a higher degree of freedom than the direction of the acoustic beam of SLch due to the wall
surface reflection.
[0059]
Further, in the reflector assignment rule for SLch, the ratio of the peak value in the peak
direction assigned to SLch to the peak value in the peak direction assigned to Cch is set higher
than that in the normal rule. Since the acoustic reflection plate RB has less irregular reflection
and absorption of sound than general wall surfaces, there is less loss of sound pressure power at
one reflection. In addition, as for SLch, the number of reflections is two in the case of wall surface
reflection, whereas the number of reflections is one in the case of using the acoustic reflection
plate RB. Therefore, the acoustic beam reflected by the acoustic reflection plate RB is less in loss
of sound pressure power when reaching the listening position than the acoustic beam reflected
by the wall surface.
[0060]
03-05-2019
19
The direction setting unit 1152 specifies the peak direction to be assigned to the SLch in
accordance with the above-described reflector assignment rule for SLch. Specifically, the
direction setting unit 1152 sets the peak value of the peak value of the peak point P3
corresponding to Cch among the peak areas (in this case, the peak area A2 and the peak area A6)
whose peak directions are within the expanded range. Peak area A6 which is more than a
predetermined ratio (for example, 60%) is specified. The direction setting unit 1152 assigns the
peak direction of the peak region A6 thus specified to SLch.
[0061]
As shown in FIG. 7F, the SLch intended by the user is assigned to the acoustic reflection plate RB
by the processing of the sound output device 11 as described above.
[0062]
FIG. 8 is a view showing an example in which the acoustic reflection plate RB is disposed at a
position different from the example shown in FIG.
As shown in FIG. 8A, in the case where the acoustic reflection plate RB is disposed at a position
on the left front as viewed from the listening position, a sound pressure profile as shown in FIG.
8B is obtained. In FIG. 8B, a peak area A6 is a peak area corresponding to the acoustic reflection
plate RB.
[0063]
In the case where the setting of the acoustic reflector is shown in FIG. 6A (“no acoustic reflector
for all channels”) although the acoustic reflector RB is disposed for Lch, the acoustic reflector
The presence / absence identification unit 1153 identifies that there is no acoustic reflection
plate, and the direction setting unit 1152 assigns a peak direction to each channel according to a
normal rule.
[0064]
In this case, the acoustic reflection plate RB is not necessarily assigned to Lch.
03-05-2019
20
This is because, as described above, the normal rule is based on the assumption that the acoustic
beams of all the channels other than Cch are reflected by the wall of the room, and not based on
the assumption that the acoustic reflector is used. It is.
[0065]
Specifically, as shown in FIG. 8C, the direction setting unit 1152 selects, for example, 30 to 50
degrees of the peak directions specified by the peak specifying unit 1151 in selecting the peak
direction to be assigned to Lch. Choose one. Therefore, in the case where the acoustic reflection
plate RB is disposed within the range of 0 degrees to 30 degrees as shown in FIG. 8A, the
direction setting unit 1152 generates the acoustic reflection plate RB as shown in FIG. The peak
direction (angle θ1) of the peak point P1 is assigned to Lch, not the peak direction (angle θ6)
indicating the direction of.
[0066]
On the other hand, in the case where the setting of the acoustic reflector is shown in FIG. 9
(“with acoustic reflector for Lch and“ without acoustic reflector ”for other channels”), the
acoustic reflector presence / absence specification unit 1153 determines the acoustic for Lch.
Identify that there is a reflector. The specific result is handed over to the direction setting unit
1152.
[0067]
When the direction setting unit 1152 receives from the acoustic reflector presence / absence
identification unit 1153 a specific result that there is an acoustic reflector for Lch, the
assignment of the peak direction to the Lch is replaced with the general rule for the following
Lch Use reflector assignment rules. (Peak direction assigned to Lch) The peak direction is
included in a predetermined range (for example, 5 to 50 degrees) close to the 0 degree side, and
the peak value is a predetermined ratio (for example, 60%) of the peak value in the peak
direction assigned to Cch. ) Or more peak directions. (If there is more than one, the peak value is
the largest)
[0068]
03-05-2019
21
That is, in the reflector assignment rule for Lch, the range of selection of the peak direction is
expanded to the 0 degree side as shown in FIG. 8E, as compared with the normal rule. This is
because the direction of the Lch acoustic reflector RB seen from the speaker array 110 has a
higher degree of freedom than the direction of the Lch acoustic beam due to wall surface
reflection.
[0069]
Also, in the reflector assignment rule for Lch, the ratio of the peak value in the peak direction
assigned to Lch to the peak value in the peak direction assigned to Cch is set higher than that in
the normal rule. The acoustic reflector RB has less loss of sound pressure power per reflection
than a general wall surface, and the acoustic beam reflected by the acoustic reflector RB is at the
listening position compared to the acoustic beam reflected by the wall. This is because the loss of
sound pressure power upon arrival is small.
[0070]
The direction setting unit 1152 specifies the peak direction to be assigned to Lch in accordance
with the above-mentioned reflector assignment rule for Lch. Specifically, the direction setting
unit 1152 sets the peak value of the peak value of the peak point P3 corresponding to Cch
among the peak areas (in this case, the peak area A6 and the peak area A1) whose peak
directions are within the expanded range. Peak area A6 which is more than a predetermined ratio
(for example, 60%) is specified. The direction setting unit 1152 assigns the peak direction of the
peak region A6 thus specified to Lch.
[0071]
By the process of the sound output device 11 as described above, Lch intended by the user is
assigned to the acoustic reflection plate RB as shown in FIG. 8 (F).
[0072]
FIG. 10 illustrates that even if the shapes of the sound pressure profiles are similar although the
arrangement positions of the acoustic reflectors are different, the sound emitting device 11
correctly assigns the channels to the acoustic reflectors. It is a figure for.
03-05-2019
22
[0073]
As shown in FIG. 10A, when the acoustic reflection plate RB for Lch is disposed on the left front
as viewed from the listening position, the sound pressure profile is as shown in FIG. 10C.
Further, as shown in FIG. 10B, when the acoustic reflection plate RB for SLch is disposed slightly
backward on the left as viewed from the listening position, the sound pressure profile is as
shown in FIG. 10D.
In any of the sound pressure profiles of FIG. 10C and FIG. 10D, the peak area A6 corresponding
to the acoustic reflection plate RB is substantially at the same position between the peak area A1
and the peak area A2. Therefore, it is difficult to specify to which of Lch and SLch the peak
direction (angle θ6) according to the peak area A6 should be assigned based on only the shape
of the sound pressure profile.
[0074]
In the present embodiment, since the setting of the acoustic reflection plate set by the user is
used, the direction setting unit 1152 can correctly assign the peak direction (angle θ6)
according to the peak area A6 to Lch or SLch.
[0075]
Specifically, as shown in FIG. 11A, the user performs the setting of “with acoustic reflector”
(with respect to other channels “without acoustic reflector”) for Lch on the acoustic reflector
setting screen. In the assignment of peak directions to Lch, the direction setting unit 1152
assigns the peak direction (angle θ6) of the peak region A6 to Lch in accordance with the
reflector assignment rule for Lch.
[0076]
Subsequently, in the assignment of peak directions to SLch, the direction setting unit 1152
assigns the peak direction (angle θ2) of the peak point P2 to SLch according to a general rule
(FIG. 10E).
03-05-2019
23
[0077]
On the other hand, as shown in FIG. 11 (B), when the user sets the “with acoustic reflector”
(with respect to other channels, “without acoustic reflector”) for SLch in the acoustic reflector
setting screen, the direction is set. In the assignment of peak directions to Lch, unit 1152 assigns
the peak direction (angle θ1) of peak point P1 to Lch in accordance with the usual rule.
[0078]
Subsequently, in the assignment of peak directions to SLch, the direction setting unit 1152
assigns the peak direction (angle θ6) of the peak area A6 to SLch in accordance with the
reflector assignment rule for SLch (FIG. 10F).
[0079]
FIG. 12 is a diagram for describing a procedure in which the sound emitting apparatus 11
allocates channels to the acoustic reflectors when the plurality of acoustic reflectors are disposed
in the space SP.
[0080]
As shown in FIG. 12A, when the acoustic reflection plate RB1 for Lch is disposed on the left front
as viewed from the listening position and the acoustic reflection plate RB2 for SLch is disposed
on the left rear as viewed from the listening position The sound pressure profile is as shown in
FIG. 12 (B).
Then, as shown in FIG. 13, it is assumed that the user sets “with acoustic reflector” (with
“other acoustic reflector without” for the other channels) for Lch and SLch in the acoustic
reflector setting screen.
[0081]
First, the direction setting unit 1152 receives from the acoustic reflector presence / absence
identification unit 1153 the identification result that there is an acoustic echo board for Lch in
the assignment of the peak direction to Lch, so according to the reverberation board assignment
rule for Lch, Identify the peak direction.
03-05-2019
24
Specifically, the direction setting unit 1152 specifies the peak area A1 and the peak area A6 as
peak areas whose peak directions fall within a range after expansion (for example, 5 degrees to
50 degrees), and peak values among those peak areas The peak area A6 is specified as 60% or
more of the peak value of the peak area A3 corresponding to Cch.
The direction setting unit 1152 assigns the peak direction (angle θ6) of the peak area A6 thus
specified to Lch.
[0082]
Subsequently, the direction setting unit 1152 receives the identification result that there is an
acoustic echo board for SLch in the assignment of the peak direction to the SLch from the
acoustic reflector presence / absence identification unit 1153, so the range after the peak
direction is expanded The peak area A6, the peak area A2, and the peak area A7 are identified as
the peak areas falling within (for example, 40 degrees to 80 degrees), and the peak area A2 and
the peak area A7 excluding the peak area A6 already assigned to Lch Peak area A7 is specified as
60% or more of the peak value of peak area A3 whose peak value corresponds to Cch.
The direction setting unit 1152 assigns the peak direction (angle θ7) of the peak area A7 thus
specified to SLch.
[0083]
As described above, even when a plurality of acoustic reflectors are used, the direction setting
unit 1152 can assign a desired channel in many cases to each of the directions of the plurality of
acoustic reflectors.
[0084]
[Modification] The embodiment described above can be variously modified within the scope of
the technical idea of the present invention.
The following shows examples of such modifications.
03-05-2019
25
[0085]
In the embodiment described above, a configuration is adopted in which the acoustic reflector
presence / absence identification unit 1153 identifies whether the acoustic reflector is disposed
in the space SP based on the content of the setting regarding the acoustic reflector input by the
user. ing.
Instead of this, a configuration may be adopted in which the acoustic reflector presence /
absence identification unit 1153 identifies a peak region satisfying a predetermined condition as
a peak region corresponding to the reflector (hereinafter referred to as “reflector peak
region”). .
[0086]
In this modification, the acoustic reflector presence / absence identification unit 1153 identifies a
peak region that satisfies a predetermined condition (hereinafter, referred to as “reflector
condition”) as described below, for example, as a reflector peak region.
(Reflector Plate Condition) The peak value is a predetermined ratio (for example, 60%) or more of
the peak value of peak point P3 corresponding to Cch, and the width in the horizontal axis
direction of the peak region is a predetermined threshold (for example, 10 degrees) ) Below.
[0087]
Acoustic reflectors, as already mentioned, have less loss of sound pressure level at reflection than
wall reflection. Also, an acoustic beam that is reflected by the acoustic reflector and reaches the
listening position does not normally have two or more reflections. Therefore, the sound pressure
level of the acoustic beam reflected by the acoustic reflector to reach the listening position is
higher than the sound pressure level of the acoustic beam reaching the listening position by wall
reflection with respect to the Cch reaching the listening position without reflection. .
03-05-2019
26
[0088]
The acoustic reflector has a predetermined width (for example, 300 mm), and the range of the
direction of the acoustic beam reflected by the acoustic reflector to reach the listening position is
the direction of the acoustic beam reaching the listening position by wall reflection. It is narrower
than the range. The reflecting plate condition is a condition for determining whether or not the
peak area is the reflecting plate peak area based on the characteristics of the acoustic beam
reflected by the acoustic reflecting plate.
[0089]
For example, in the sound pressure profile illustrated in FIG. 12B, the acoustic reflector presence
/ absence identification unit 1153 according to this modification identifies the peak area A6 and
the peak area A7 as a reflector peak area. When the acoustic reflector presence / absence
identification unit 1153 identifies the reflector peak area, the acoustic reflector presence /
absence identification unit 1153 passes information on the identified reflector peak area to the
direction setting unit 1152. In this case, the direction setting unit 1152 sets the peak direction
(θ6) of the peak area A6 close to the 0 degree side to Lch and also on the 90 degree side based
on the information on the reflector peak area delivered from the acoustic reflection plate
presence / absence specifying unit 1153 The peak direction (θ7) of the peak area A7 is assigned
to SLch. As a result, as shown in FIG. 12C, desirable channels are assigned to the acoustic
reflector. According to the sound emitting apparatus 11 according to this modification, the user
does not have to make settings regarding the acoustic reflector.
[0090]
You may combine the modification mentioned above with embodiment mentioned above. That is,
the acoustic reflection plate presence / absence identification unit 1153 identifies the presence /
absence of the acoustic reflection plate based on the setting by the user, and identifies the
reflection plate peak area based on the reflection plate condition to confirm the setting of the
user. It may be adopted. In this case, for example, even if the user sets “with acoustic reflector”
for any of the channels, if the acoustic reflector presence / absence specification unit 1153 can
not identify the peak region satisfying the reflector condition, the sound output device 11 may
display a message on the display unit 120 to prompt the user to confirm the setting.
03-05-2019
27
[0091]
Further, in the embodiment described above, a configuration is adopted in which the speaker
array 110 emits an acoustic beam only in the horizontal direction. The present invention is not
limited to this, and a speaker array capable of emitting an acoustic beam also in the vertical
direction reflects on the floor or ceiling or an acoustic reflector placed at a position lower or
higher than the height of the listener's head A sound emitting apparatus may be configured to
perform three-dimensional multi-channel surround sound reproduction using the reflection at.
[0092]
In the above-described embodiment, the sound emitting apparatus 11 reproduces 5.1 channel
multi-channel surround sound as an example, but the number of channels of multi-channel sound
reproduced by the sound emitting apparatus according to the present invention is described as
an example. The configuration is not limited to 5.1 channels, and the present invention can be
applied to the reproduction of various other multi-channel sounds.
[0093]
The specific numerical values, conditions, order of processing, etc. shown in the description of
the embodiment described above are merely examples, and other numerical values, conditions,
order of processing, etc. may be adopted.
[0094]
DESCRIPTION OF SYMBOLS 1 ... sound emission system, 2 ... sound emission system, 11 ... sound
emission apparatus, 12 ... microphone, 21 ... sound emission apparatus, 91 ... sound emission
apparatus, 110 ... speaker array, 111 ... source sound signal input part, 112 ... decoder , 113:
sound signal output unit, 114: DA converter, 115: control unit, 116: sound collection signal input
unit, 117: AD converter, 118: storage unit, 119: operation unit, 120: display unit, 1101: speaker,
1131 ... processing block, 1151 ... peak identification unit, 1152 ... direction setting unit, 1153 ...
acoustic reflector presence / absence identification unit
03-05-2019
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