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JP2007037059

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007037059
An object of the present invention is to obtain a good sense of localization in a wide area.
SOLUTION: Focus Ptg1 of Lch speaker unit LSP0-LSPn is arranged outside Rch speaker unit
RSP0-RSPn, focus Ptg2 of Rch speaker unit RSP0-RSPn is arranged outside Lch speaker unit
LSP0-LSPn, Lch The main axis L of directivity of the speaker units LSP0 to LSPn crosses the main
axis R of directivity of the speaker units RSP0 to RSPn of Rch. [Selected figure] Figure 2
Speaker apparatus and method of reproducing audio signal
[0001]
The present invention relates to a speaker apparatus including a plurality of speaker units and
controlling the directivity of audio signals output from the speaker units, and a method of
reproducing audio signals output from the plurality of speaker units.
[0002]
There is a speaker array as a speaker system suitable for application to home theaters, AV
systems, etc. (see, for example, Patent Document 1).
FIG. 5 shows an example of the speaker array 10. The speaker array 10 is an array of a large
number of speakers (speaker units) SP0 to SPn. In this case, as an example, the aperture of the
speaker is several centimeters. The speaker units SP0 to SPn are two-dimensionally arranged on
a plane, or arranged on a straight line in the horizontal direction.
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[0003]
Then, the audio signal is supplied from the source SC to the delay circuits DL0 to DLn and
delayed by a predetermined time τ0 to τn, and the delayed audio signal is supplied to the
speakers SP0 to SPn through the power amplifiers PA0 to PAn, respectively. . The delay times
τ0 to τn of the delay circuits DL0 to DLn will be described later.
[0004]
Then, in any place, the sound waves output from the speakers SP0 to SPn are synthesized, and
the sound pressure of the synthesis result is obtained. Therefore, as shown in FIG. 5, in the sound
field formed by the speakers SP0 to SPn, predetermined points Ptg, Pnc, Ptg: a place where the
sound pressure is desired to be higher than that of the surroundings. Sound pressure
augmentation point. Pnc: A place where you want to lower the sound pressure than the
surroundings. Sound pressure reduction point. Then, the method of setting an arbitrary place as
the sound pressure increase point Ptg can be roughly classified into the method shown in FIG. 5
or FIG.
[0005]
That is, in the case of the method shown in FIG. 5, assuming that L0 to Ln: distance from each of
the speakers SP0 to SPn to the sound pressure increase point Ptg: sound speed, the delay times
τ0 to τn of the delay circuits DL0 to DLn are τ0 = (Ln-L0) /s.tau.1= (Ln-L1) / s .tau.2 = (Ln-L2)
/ s... Set .tau.n = (Ln-Ln) / s = 0.
[0006]
Then, when the audio signals outputted from the source SC are converted into sound waves by
the speaker units SP0 to SPn and outputted, all the sound waves reach the sound pressure
intensifying point Ptg at the same time, and the sound The sound pressure at the pressure
buildup point Ptg is larger than that at the surroundings.
[0007]
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That is, in the case of the system of FIG. 5, although a time difference is generated in each sound
wave due to the path difference from the speaker units SP0 to SPn to the sound pressure
intensifying point Ptg, this time difference is compensated by the delay circuits DL0 to DLn It
focuses the sound on Ptg.
Hereinafter, this type of system is referred to as “focus type”, and the sound pressure
intensifying point Ptg is referred to as “focus”.
[0008]
Further, in the case of the method shown in FIG. 6, the delay times τ0 to τn of the delay
circuits DL0 to DLn should be set so that the phase wavefronts of the traveling waves (sound
waves) output from the speaker units SP0 to SPn become the same. Accordingly, the directivity of
the sound wave is given, and the direction of the directivity is set as the direction of the sound
pressure enhancing store Ptg.
This speaker array 20 can also be considered as when the distances L0 to Ln are infinite in a
focusing type system. Hereinafter, the speaker array 20 of this type is referred to as “directional
type”, and the direction of the sound wave in which the phase wavefronts of the sound waves
are aligned is referred to as “directing direction”.
[0009]
Unexamined-Japanese-Patent No. 9-233591
[0010]
An example of the directional speaker array 2 is shown in FIG.
The directional speaker array 2 of FIG. 7 is a stereo speaker of 2ch (channels). In the directional
speaker array 2, the left half of the speaker units toward the speaker array is Lch (channel), and
the other half of the speaker units toward the speaker array is Rch (channel). The Lch speaker
unit simultaneously outputs the Lch side signal, and the Rch speaker unit simultaneously outputs
the Rch side signal. The output of the directional speaker array 2 is a plane wave having a
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direction in the output direction of the speaker unit.
[0011]
In the directional speaker array 2 of FIG. 7, when the listener is at the same distance from the
position of FIG. 7, that is, Rch and Lch, Rch and Lch have the same sound level and are stereolocalized. However, when the listener is at the position of FIG. 8, that is, closer to Lch than Rch,
the sound level of Lch becomes higher than the sound level of Rch, and the sense of stereo
localization deteriorates. Furthermore, as the listener shifts to the left, the difference between the
Lch audio level and the Rch audio level increases, and the sense of stereo localization
deteriorates. Also, even when the listener is on the Rch side, the sound level of the Rch becomes
higher than the sound level of the Lch, and the feeling of stereo localization worsens.
[0012]
Further, FIG. 9 shows an example of the focusing speaker array 3. The focus type speaker array 3
of FIG. 9 is a 2ch stereo speaker. In the focused speaker array 3, the left half speaker unit toward
the speaker array is Lch, and the right half speaker unit is Rch. The focal point Ptg of Lch and
Rch is a point Ptg separated by a distance E from the center of the focusing loudspeaker array.
[0013]
In the focused speaker array 3 of FIG. 9, when the listener is at the same distance from the
positions in FIG. 9, that is, Rch and Lch, Rch and Lch are at the same sound level at the listening
point, and stereo localization is performed. . However, when the listener is at the position of FIG.
10, that is, when the listener is closer to Lch than Rch, the sound level of Lch becomes stronger
than the sound level of Rch, and the sense of stereo localization deteriorates. Also, even when the
listener is at a position closer to Rch than Lch, the sound level of Rch becomes higher than the
sound level of Lch at the listening point, and the sense of stereo localization deteriorates.
[0014]
Furthermore, an example of another speaker is shown in the figure. The speaker 5 of FIG. 11 is a
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2ch stereo speaker. The speaker 5 includes two speaker units, the left speaker unit is Lch, and
the right speaker unit is Rch.
[0015]
In the loudspeaker of FIG. 11, when the listener is at the same distance from the position of FIG.
11, that is, Rch and Lch, the audio levels of Rch and Lch are the same, and stereo localization is
performed. However, when the listener is at the position of FIG. 12, that is, closer to Lch than
Rch, the sound level of Lch becomes stronger than the sound level of Rch, and the sense of stereo
localization deteriorates. Conversely, even when the listener is closer to Rch than Lch, the sound
level of Rch becomes stronger than the sound level of Lch, and the sense of stereo localization
worsens.
[0016]
The present invention has been made in view of the problems described above, and it is an object
of the present invention to provide a speaker device and a method of reproducing an audio signal
that can obtain a good sense of localization in a wide area.
[0017]
In order to solve the problems described above, a speaker device to which the present invention
is applied includes a plurality of speaker units that constitute a speaker array, and a delay
processing unit that delays the output of audio signals to the plurality of speaker units. It is a
speaker device which gives directivity to voice by controlling the delay time of the delay
processing unit, and when audio signals of a plurality of channels are input, the directivity of the
voice of each channel output from the plurality of speaker units The main axis is crossed in front
of the listener's listening area.
[0018]
The audio signal reproduction method to which the present invention is applied delays the audio
signal by a predetermined time, supplies the delayed audio signal to each of the plurality of
speaker units constituting the speaker array, and directs the voice to directivity. A method of
reproducing an audio signal to be given, wherein when audio signals of a plurality of channels
are input, principal axes of directivity of voices of respective channels outputted from the
plurality of speaker units intersect in front of a listener's listening area Adjust the delay time of
the audio signal.
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[0019]
According to the speaker device to which the present invention is applied, when audio signals of
a plurality of channels are input by controlling delay times of a plurality of speaker units
constituting a speaker array, each channel output from the plurality of speaker units By crossing
the main axis of the directivity of the voice of the above in front of the listening area of the
listener, the Lch audio level in the listening area and the audio level of Rch are equalized to give a
sense of stereo localization in a wide area.
[0020]
Hereinafter, a speaker array 1 to which the present invention is applied will be described with
reference to the drawings.
The speaker array 1 to which the present invention is applied is a focusing speaker array.
The structure of the speaker array 1 is shown in FIG.
[0021]
The speaker array 1 includes Lch speaker units LSP0 to LSPn, Rch speaker units RSP0 to RSPn,
Lch speaker unit delay circuits LDL0 to LDLn, Rch speaker unit delay circuits RDL0 to RDLn, Lch
speaker unit amplifiers AMPL0 to AMPLn, It consists of amplifiers AMPR0 to AMPRn of the Rch
speaker unit.
The speaker array 1 is linearly arranged in the horizontal direction in which a plurality of
speaker units LSP0 to LSPn and RSP0 to RSPn are two-dimensionally arranged on a plane.
[0022]
The delay circuits LDL0 to LDLn and RDL0 to RDLn delay the outputs of the respective speaker
units LSP0 to LSPn, and RSP0 to RSPn to give directivity to voice.
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In the speaker array 1 according to the present embodiment, the sounds of the speaker units
LSP0 to LSPn and RSP0 to RSPn are concentrated on the focal points Ptg1 and Ptg2 to increase
the sound pressure at the focal points Ptg1 and Ptg.
[0023]
The right channel amplifiers AMPR0 to AMPRn and the left channel AMPL0 to AMPLn increase
the output level as the speaker unit is more outward. This widens the width of the L channel and
the R channel, and increases the sense of stereo.
[0024]
The axis connecting the speaker array 1 and the focal point is called the main axis of directivity.
Further, an area where a listener who listens to the sound output from the speaker array 1 is
referred to as a listening area S. In the speaker array 1 to which the present invention is applied,
the main axis L of the directivity of the L channel and the main axis R of the directivity of the R
channel cross each other in front of the listening area S. As a result, in the listening area S, the
sound pressure of the L channel increases toward the right, and the sound pressure of the R
channel increases toward the left. In the conventional speaker apparatus, when the listener
moves to the right, the listener approaches the speaker unit of the L channel, so the sound of the
R channel becomes large in the L channel, but in the speaker array 1 to which the present
invention is applied, Since the focus of the R channel is set to the L channel side, the sound level
of Lch increases and the sound level of Rch decreases as the listener moves to the right. As a
result, the difference between the left and right sound levels due to the distance between the
speaker unit and the listening point is offset by the speaker unit directivity, and can be obtained
with substantially equal sound levels as Lch and Rcl, and stereo localization feeling can be
obtained.
[0025]
The structure for connecting the focus of the focusing speaker array 1 will be described by
taking the Lch speaker unit as an example. The distance between each Lch speaker unit and the
focal point Ptg1 of the Lch speaker unit is L0 to Ln, respectively. In the speaker unit LSP0 closest
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to the focal point Ptg1 and the other speaker units LSP1 to LSPn, there is a difference in the
distance of 11 to ln.
[0026]
The delay circuits LDL0 to LDLn delay the output to the speaker units LP0 to LSPn by the time
obtained by dividing the distance difference 11 to 1n by the sound speed c between the speaker
units LSP0 to LSPn and the focal point Ptg1.
[0027]
As described above, when the delay time of the speaker unit located outside is lengthened
according to the distance between the speaker unit and the focal point Ptg1, the audio output
from each of the speaker units LSP0 to LSPn simultaneously reaches the focal point Ptg1 and the
focal point Ptg1 The sound level of Lch becomes strong.
[0028]
The same applies to the Rch speaker unit.
The delay circuits RDL0 to RDLn are the speaker units RSP0 only for the time obtained by
dividing the distance difference r1 to rn between the speaker units RSP0 closest to the focal
point Ptg2 and the other speaker units RSP1 to RSPn among the Rch speaker units RSP0 to RSPn.
-Delay the output to RSPn.
As a result, the audio output from each of the speaker units RSP0 to RSPn simultaneously
reaches the focal point Ptg2, and the audio level of Rch at the focal point Ptg2 becomes strong. In
the speaker array 1, it is possible to focus on a desired position by adjusting the delay amounts
of the delay circuits LDL0 to LDLn and RDL0 to RDLn.
[0029]
The axis connecting the speaker array 1 and the focal point is called the main axis of directivity.
As shown in FIG. 2, the directivity main axis L of the Lch speaker units LSP0 to LSPn intersects
with the directivity main axis R of the Rch speaker units RSP0 to RSPn.
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[0030]
That is, in the speaker array 1, the Lch speaker units LSP0 to LSPn are oriented on the Rch side,
and the Rch speaker units RSP0 to RSPn are oriented on the Lch side.
[0031]
As shown in FIG. 3, when the listener is at the same position as the Lch speaker units LSP0 to
LSPn and the Rch speaker units RSP0 to RSPn, the sound of Lch and the sound of Rch are
transmitted equally, so a sense of stereo localization is felt. Is obtained.
[0032]
Also, as shown in FIG. 4, when the listener moves to the left, the Rch speaker units RSP0 to RSPn
are farther from the listening point than the Lch speaker units LSP0 to LSPn, so the audio level of
Rch should be smaller. However, since the directivity is set as shown in FIG. 2, the sound level of
Rch increases and the sound level of Lch decreases as the listening point goes to the right.
As a result, the difference between the left and right audio levels due to the distance between the
speaker unit and the listening point is offset by the directivity of each speaker unit, and can be
obtained with almost equal audio levels as Lch and Rch. Be
[0033]
When the listener moves to the right, the Lch speaker units LSP0 to LSPn are farther from the
listening point than the Rch speaker units RSP0 to RSPn, so the Lch audio level should be
smaller, as shown in FIG. Since the directivity is set, the sound level of Lch increases as the
listening point goes to the left, and the sound level of Rch decreases.
As a result, the difference between the left and right audio levels due to the distance between the
speaker unit and the listening point is offset by the directivity of each speaker unit, so that Lch
and Rch can be obtained with almost equal audio levels, and stereo localization feeling can be
obtained.
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[0034]
As described above, in the speaker array 1 to which the present invention is applied, the Lch
focal point Ptg1 is disposed on the Rch speaker unit RSP0 to RSPn side, and the Rch focal point
Ptg2 is disposed on the Lch speaker unit LSP0 to LSPn side. The main axis L of the directivity of ~
LSPn crosses the main axis R of the directivity of the Rch speaker units RSP0 to RSPn.
[0035]
In the speaker array 1 to which the present invention is applied, the directivity of the Rch
speaker units RSP0 to RSPn is given to the Lch side even if the listener moves to the Lch side, so
the Lch volume and the Rch volume are almost equal. This gives a sense of stereo localization.
Also, even if the listener moves to the Rch side, the directivity of the Lch speaker units LSP0 to
LSPn is given to the Rch side, so the volume of the Rch and the volume of the Lch become almost
equal, and a sense of stereo localization can be obtained .
[0036]
In the speaker array 1 to which the present invention is applied, even when a certain listener
moves, even when there are a plurality of listeners and each listener is listening to voice at
different places, the listener can receive a suitable amount of sound. Can give a sense of stereo
localization.
[0037]
As shown in FIG. 2, the Lch main axis L and the Rch main area R inside have a focal point
switched between Lch and Rch, but the sound source is clearly Lch from the left and Rch from
the right. So it doesn't sound right or wrong.
Also, when the listener is in the area S, the left and right levels are equal.
[0038]
In the speaker array 1 according to the present embodiment, the number of Lch speaker units
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and the number of Rch speaker units are the same n, but the number of Lch speaker units and
the number of Rch speaker units may not necessarily be the same. .
[0039]
Furthermore, although the speaker array 1 in the present embodiment has two channels of Lch
and Rch, a speaker unit for outputting audio of two or more channels is provided to shift the
main axis of directivity of each speaker unit. A delay time may be set.
[0040]
It is a block diagram showing composition of a speaker array to which the present invention is
applied.
It is the conceptual diagram which visualized the focus of the said speaker array, and the main
axis of directivity.
It is a conceptual diagram which shows the relationship between the said speaker array and a
listener. It is a conceptual diagram which shows the relationship between the said speaker array
and a listener. It is a block diagram which shows the structure of the conventional focus-type
speaker array. It is a block diagram which shows the structure of the conventional directional
type speaker array. It is a conceptual diagram which shows the relationship between the
conventional directional speaker array and a listener. It is a conceptual diagram which shows the
relationship between the conventional directional speaker array and a listener. It is a conceptual
diagram which shows the relationship between the conventional focus-type speaker array and a
listener. It is a conceptual diagram which shows the relationship between a focusing type | mold
speaker array and a listener. It is a conceptual diagram which shows the relationship between a 2
channel speaker and a listener. It is a conceptual diagram which shows the relationship between
a 2 channel speaker and a listener.
Explanation of sign
[0041]
Reference Signs List 1 speaker array, 5 sound source, LDL0 to LDLn delay circuit, RDL0 to RDLn
delay circuit, LSP0 to LSPn Lch speaker unit, RSP0 to RSPn Rch speaker unit, Ptg1 Lch focus,
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Ptg2 Rch focus
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