JPH07241000

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH07241000
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of reproducing signals processed by a plurality of signal conversion circuits having a
predetermined transfer characteristic and supplied with the same sound source from a plurality
of spaced speakers. The present invention relates to sound image localization control that causes
a sound image to feel localized at a desired arbitrary position different from the speaker of the
present invention, and more particularly to a sound image localization control chair in which the
speaker is provided in a chair.
[0004]
2. Description of the Related Art In recent years, amusement game machines and computer
terminals using virtual reality (virtual reality) have appeared, and even in these game machines
and terminals, sound image localization with a sense of reality corresponding to the screen is
required. I'm starting. For example, in a game machine, the movement of a flying sound matching
the movement of an airplane on the screen is required, and the movement of the airplane needs
to be subjected to real-time sound image processing. The method of calculating the above
coefficient will be described with reference to FIGS. FIG. 8 shows an HRTF measurement system
31 used to calculate the coefficient. A pair of microphones ML and MR are installed on both ears
of the dummy head (or human head) DM, and the measurement sound from the speaker SP is
received, the source sound (reference data) refL and refR and the measurement sound
(measurement Data) Synchronize L and R to record. Then, the position of the speaker SP is set at
a plurality of angles θ (for example, 12 points every 30 degrees as shown in FIG. 9) in the space
10-05-2019
1
arranged with the front face set at 0 degrees (°), and each predetermined time Only record
continuously. From the source sounds (reference data) refL and refR recorded in synchronization
and the sounds to be measured (measurement data) L and R, the HRTF impulse response for each
point is calculated. Then, coefficients cfLx and cfRx to be set to the convolver are calculated from
this impulse response. That is, as shown in FIG. 10, assuming that the left and right speakers SP1
and SP2 are placed at an opening angle of 30 °, the position θ = 30 ° of the right speaker SP2
and the position θ = 330 ° of the left speaker SP1. 12 sets of coefficient groups cfLx and cfRx
are obtained every 30 ° using the impulse response of and the impulse response for each point
(in FIG. 10, the position of 240 ° is taken as an example). These coefficient groups cfLx and cfRx
are finally obtained as an impulse response which is a response on the time axis.
[0005]
Therefore, the present applicant has proposed a method of so-called sound image localization
control in which the sound source is felt at a specific position by the level difference and phase
difference (time difference) of the signal in both ears (Japanese Patent Application No. 4-343459,
Filed on November 30, 1992). Hereinafter, this sound image localization control method will be
described. When a sound image localization command is input to the CPU 13 of the sound image
localization control unit 11, the CPU 13 reads out a coefficient corresponding to the sound image
localization position (x) out of the coefficient group stored in the coefficient ROM 14 Set to the
convolvers 12L and 12R. Then, when the same sound source (X) is supplied to the pair of
convolvers 12L and 12R in which the coefficients are set, the signal from the sound source (X) is
subjected to convolution calculation processing on the time axis, and the D / A converter 15 The
digital signal is converted into an analog signal, amplified by an amplifier 16, and reproduced
from a pair of spaced apart speakers SP1 and SP2. The sound reproduced from the pair of
speakers SP1 and SP2 has its sound image localized so that the crosstalk to both ears is canceled
and the sound source is at the desired arbitrary position (x), and the listener (for example, game
operation) Person) M is asked. By matching the switching of the coefficients to the movement of
an airplane or the like on the screen, the listener sounds as if the airplane were moving.
[0006]
The sound image localization control method uses the sound image localization control apparatus
11 shown in FIG. The sound image localization control device 11 has a pair of speakers SP1 and
SP2 disposed apart from each other, and a pair of convolvers 12L and 12R (the coefficient is
cfLx, to which the same sound source (X) is supplied from the speakers). Make the listener M feel
that the sound image is localized at an arbitrary position (x) different from the pair of speakers
10-05-2019
2
SP1 and SP2 by reproducing the signal processed by the convolution calculation processing
circuit composed of the cancellation filter which is cfRx). . By the way, there is a demand for
better enjoyment of the three-dimensional sound field by sound image localization control as
described above. For example, in the case of game machines, in recent years, there are some
which require two or more game operators. As described above, when there are a plurality of
listeners for one image (three-dimensional sound space), it is necessary to reproduce the threedimensional sound field for each listener. However, in the sound image localization control device
11 described above, it is difficult to reproduce a three-dimensional sound field for each listener
who is at an arbitrary position with respect to the position of the speaker.
[0003] In order to localize a sound image using the sound image localization control apparatus,
the coefficients cfLx and cfRx of the pair of convolvers 12L and 12R are rewritten according to
the sound image localization position (x). The coefficients (cfLx, cfRx) set in the convolvers 12L
and 12R measure head related transfer functions (hereinafter referred to as HRTFs) at respective
sound image localization positions, and a pair of IRs corresponding to the HRTFs The coefficients
of a pair of cancel filters are obtained from the impulse response, and the coefficients are
subjected to scaling processing for giving a predetermined attenuation.
[0009] The coefficient groups cfLx and cfRx obtained by the above processing are stored in the
coefficient ROM 14 after being subjected to scaling processing such as attenuating the values of
all the coefficients in order to prevent overflow at the time of convolution operation. However, as
shown in FIG. 3, when the spine 3 is made rotatable and the inclination angle θ is changed, the
positional relationship between the speaker SP and the listener M will be shifted. Here, FIG. 3 is a
view for explaining the change in the positional relationship between the speaker and the listener
according to the change in the inclination angle of the back 3, and (A) is a view when the chair is
viewed from the side, (B) is a figure when it sees from the upper part similarly.
[0007]
[0007] On the other hand, in the prior art, there has been one in which a speaker is incorporated
in a chair. In such a chair, a speaker is installed at the headrest portion (the back of the head of
the listener) so that the chair is not affected by ambient noise and can immerse in listening.
[0013] Therefore, if sound image localization control is performed using the speakers provided
in the chair as the pair of speakers SP1 and SP2 of the sound image localization control device
11, each of a plurality of listeners is independent of the position of the listener. To provide a
10-05-2019
3
three-dimensional sound field. Further, according to the present invention, as means for
achieving the above object, there is provided a seat on which a listener sits, a back rotatably
supported by the seat, and a front with respect to the listener A pair of speakers arranged at a
predetermined elevation angle and an opening angle at least at a position, and the listener sitting
on the seat by the reproduced sound from the pair of speakers is different from the pair of
speakers A sound image localization control chair for correcting the elevation angle and the
opening angle which change with the rotation of the back while making it feel that the sound
image is localized at the position of When there is a constant opening angle, correction is made
only for the elevation angle, and when the amount of change in the opening angle exceeds the
predetermined range, the value of the opening angle which has been made constant is the
opening within this rotational range. Especially to change the value of the corner It is intended to
provide a sound localization control chair to.
[0015] However, when the pair of speakers SP1 and SP2 are provided in the headrest portion of
the chair (the back of the head of the listener) as described above, the sound image is hard to be
localized and the reproduced sound It became clear by the experiments of the present inventors
that it sounds like an unnatural feeling. This is thought to be due to the structure of the human
ear, etc. The sound image is more likely to be localized when the pair of speakers are arranged
forward with respect to the listener's ear, and the reproduced sound can be heard without
unnatural feeling I came to the conclusion. Therefore, the present inventors focused on the sense
of sound image localization of human being in which direction the sound source is located.
Humans have obtained this sense of sound localization by comparing both sounds that can be
heard with both ears, but if the distance between the person and the sound source is constant,
the movement is within a certain range If so, the position judgment based on the sound image
localization feeling becomes ambiguous, and it becomes impossible to judge the movement of the
sound source. That is, the movement of the sound source changes the azimuth angle of the sound
source with respect to the person, but if the change of this azimuth angle is within a certain
range, the judgment of the azimuth change becomes ambiguous It is
[0016] By the way, when providing a speaker in the position which becomes a front with respect
to a listener, it is necessary to arrange a speaker in the position which does not bar a listener's
vision. In order to do so, it can be placed below the line of sight of the listener (the position of the
listener's ear) (for example, in the seat of the chair on which the listener sits). The sound seems to
be heard from below, and the localized sound image sounds unnatural. For this reason, it is
necessary to perform elevation correction when the speaker is disposed below the line of sight of
the listener. If the backrest of the chair (hereinafter referred to as the back) is fixed to the seat,
this elevation correction may be made constant, but the back can not be adjusted to the desired
angle. It is inconvenient. Further, as shown in FIG. 3B, when the speakers SP1 and SP2 are
provided in front of the seat portion 2, the opening angle β has a small amount of change due to
10-05-2019
4
the change of the inclination angle θ of the back 3 I focused on Therefore, the rotation range of
the back 3 so that the change amount of the opening angle β falls within a predetermined range
(for example, a shift of about ± 5 ° in a range where the position determination of the sound
source due to the sound image localization feels ambiguous) It was set. Since sound image
localization presupposes that the sound image (for example, the sound of an airplane) of the
image displayed on the television screen is localized, the listener 3 says that the back 3 is largely
defeated because of the necessity to view the television screen. I have not. For this reason, even if
the rotation range of the back 3 is set as described above, the usability does not deteriorate when
used as a sound image localization control chair. Further, if the coefficient of the convolver 12 is
calculated with the opening angle of the speakers SP1 and SP2 as the intermediate value (β1 +
β3) / 2 of the β1 and the β3, the amount of change of the opening angle β is centered on this
intermediate value As long as it is within the predetermined range, it is possible to set the
pivoting range of the back 3 within a practically practical range.
[0018] When performing sound image localization, it is particularly necessary to consider
changes in the elevation angle α and the speaker opening angle β, but as shown in the figure,
when the back 3 falls down, listening is performed according to the inclination angle θ of the
back 3 The head of the person M also moves, and the elevation angle α and the opening angle
β change. Here, the elevation angles α1 to α3 are the line of sight (horizontal lines in FIG. 3)
A1, A2 and A3 of the listener M, and the center of the head of the listener when the back 3 is
turned (in FIG. Ear positions) are angles formed by straight lines B1, B2 and B3 passing through
P1, P2 and P3, respectively. Further, the opening angles β1 to β3 are a straight line C passing
through the middle point between the speakers SP1 and SP2 disposed apart from each other and
the center of the listener, and the head of the listener when the back 3 is turned. It is an angle
which the straight lines D1, D2, D3 passing through the centers P1, P2, P3 and the center of one
speaker respectively make. An embodiment of the present invention will be described below with
reference to the attached drawings. The same reference numerals are given to the parts
described in the above-described conventional example, and the description thereof is omitted.
[0010] As shown in FIG. 6A, when the inclination angle θ of the back 3 is the smallest θ1 (when
the back 3 is most raised), the elevation angle α is α1, and the inclination angle θ is the largest
θ3. Assuming that the elevation angle at time (when the back 3 is most inclined) is α3, and the
elevation angle at the middle inclination angle θ2 is α2, these elevation angles α become α1>
α2> α3 and the inclination angle θ of the back 3 It becomes smaller as Further, as shown in
FIG. 6B, similarly, at the opening angle β, assuming that the opening angles corresponding to
the inclination angles θ1 to θ3 are β1, β2 and β3, these opening angles β become β1>
β2> β3. It becomes smaller as the inclination angle θ of the back 3 becomes larger.
10-05-2019
5
[0020] As described above, it is necessary to appropriately correct the elevation angle α and the
opening angle β which change in accordance with the inclination angle θ of the back 3. Next,
the correction filters 21R and 21L will be described.
[0021] However, it is not easy to prepare correction data according to the inclination angle of the
back 3 as described above, and the storage capacity of a ROM (Read Only Memory) or the like for
storing the data is also increased. turn into. First, in order to calculate the correction data, the
transfer characteristic based on the elevation change is measured. In the following description,
the case where the elevation angles α are α1, α2, and α3 will be described in correspondence
to FIG. 3 (A).
[0011] Therefore, the present invention has been made focusing on the above points, and a
speaker is provided in front of a chair whose back can be turned to construct a sound image
localization control chair for reproducing a three-dimensional sound field. An object of the
present invention is to provide a sound image localization control chair capable of reproducing a
three-dimensional sound field having no sense of unnaturalness even in the form of a schematic
correction process.
[0024] [Means for Solving the Problems] As means for achieving the above object, the present
invention provides a seat on which a listener sits, a back rotatably supported by the seat, and a
seat for the listener. And at least a pair of speakers spaced apart at a predetermined elevation
angle and opening angle, the listeners sitting in the seat by the reproduced sound from the pair
of speakers A sound image localization control chair that makes the sound image seem to be
localized at an arbitrary position different from the one described above and corrects the
elevation angle and the opening angle that change due to the rotation of the back, wherein the
pair of speakers is the seat It is an object of the present invention to provide a sound image
localization control chair which is disposed in front of a part, and further, the turning range of
the back is set so that the variation of the opening angle falls within a predetermined range. The
corrected data determined as described above is rewritten according to the elevation angle α
and reproduced. That is, it is as follows.
[0027] DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the sound image
localization control chair should be able to turn the back 3 so that the back 3 can be set to the
angle desired by the listener. However, assuming that the back 3 is pivotable, the elevation angle
α and the opening angle β of the speaker with respect to the listener change in accordance with
the change in the tilt angle of the back 3 (see FIG. 3). Since the coefficient of the convolver 12 is
obtained from the positional relationship between the opening angle and the sound image
10-05-2019
6
localization position, the correction due to a change in the opening angle is calculated by
calculating the coefficient of the convolver 12 according to the opening angle. It will be rewritten
to the coefficient.
[0017] As described above, if the rotation range of the back 3 is set so that the change amount of
the opening angle β due to the change of the inclination angle of the back 3 falls within a
predetermined range, it is not necessary to perform correction based on the opening angle. If
there is no need for correction based on the opening angle, it is not necessary to rewrite the
coefficient for that purpose, and it is not necessary to prepare a further corresponding
coefficient. As a result, the correction filter 21 is simplified, and the number of data to be
prepared can also be reduced.
[0032] As shown in FIG. 1, the external appearance of the sound image localization control chair
1 of the present embodiment includes the seat 2 on which the listener sits, the back 3 rotatably
supported by the seat 2, and the pair of It consists of speakers SP1 and SP2. In addition, the seat
is placed at a position where the listener sits down, a back rotatably supported by the seat, and a
position forward with respect to the listener at a predetermined elevation angle and an opening
angle. And at least a pair of speakers to make the listener feel as if the sound image is localized at
an arbitrary position different from the pair of speakers to the listener sitting in the seat by the
reproduced sound from the pair of speakers. A sound image localization control chair that
corrects the elevation angle and the opening angle, which changes due to the rotation of the
back, wherein the opening angle is fixed and the elevation angle is corrected only when the
opening angle changes within a predetermined range. When the variation of the opening angle
exceeds the predetermined range, the value of the constant opening angle is changed to the value
of the opening angle within the exceeded turning range, so that the opening angle change
becomes large. Spy in a position where Simplifying the correction process be disposed.
[0033] As described above, the rotation range (tilt range) of the spine 3 is set such that the
change amount of the opening angle falls within a predetermined range, and the opening angle
does not have to be corrected. Further, in order to reduce the number of correction data to be set
in the correction filter 21 described later, the inclination angle is set to only several steps. That is,
for example, if the spine 3 rotates in the range of 90 ° to 120, the inclination angle θ can be set
to 90 °, 100 °, 110 °, and 120 °. Further, in the sound image localization control chair in
which a plurality of listeners can be seated in the seat, the back is configured to be commonly
rotated with respect to a plurality of listeners seated in the seat, Since a plurality of pairs of the
pair of speakers are provided for one listener, the correction processing is made common, and
the same processed sound can be provided to the plurality of pairs of speakers. There is an effect
that the configuration of the sound image localization control chair configured to allow a
10-05-2019
7
plurality of listeners to sit can be simplified.
[0034] Further, the pair of speakers SP1 and SP2 are mounted in a ball-like speaker box so as
not to be aware of the change in shape due to the angle of the back 3 and further to the front of
the listener without disturbing the listener's view It is disposed in front of the seat 2, which is a
position. An output signal from the sound image localization apparatus 4 is supplied to the
speakers SP1 and SP2.
[0019] Further, the sound image localization processing device 4 localizes the sound image in
accordance with the image on the television screen and performs elevation angle correction in
accordance with the inclination angle of the back 3.
[0036] The configuration of the sound image localization processing device 4 is as shown in FIG.
2, and the speakers SP1 and SP2 are mounted on the seat 2 between the convolver 12 and the D
/ A converter 15 of the sound image localization control device 11. A correction filter 21 for
performing correction due to the provision is inserted. The correction filter 21 is constituted by a
digital filter, and provided on the pivot point of the spine 3 (see FIG. 1), the coefficient is
rewritten according to the detection result of the angle detector 24 for detecting the inclination
angle θ of the spine 3 It is supposed to be. The rewriting of the coefficient is performed by the
CPU 13 to which the detection result of the angle detector 24 is input.
[0037] The sound image localization control device 4 may be provided in the chair 1, but can
also be provided outside by providing input terminals to the speakers SP1 and SP2 and an output
terminal of the angle detector 24. .
[0039] The sound image localization control chair 1 does not perform correction based on the
change in the opening angle by setting the rotation range of the back 3 within a predetermined
range, but the elevation angle α is also shown in FIG. 3 (A). , And largely change according to the
change of the inclination angle θ of the back 3. Therefore, in the correction filters 21L and 21R,
the elevation angle α is corrected. The sound image localized by the convolver 12 is reproduced
on the premise that the pair of speakers SP1 and SP2 are arranged at the front position of the
listener's head (horizontal position with respect to the listener). When the SP 2 is installed at the
elevation angle α, it may be corrected as if the reproduced sound image is output from the front
position. That is, as in the case of the convolver 12, the sound image may be localized utilizing
the transfer characteristic, and the coefficient is rewritten when the inclination angle of the back
portion 3 changes. The transfer characteristic is actually measured according to the elevation
10-05-2019
8
angle α, and the coefficient of the correction filter 21 (hereinafter, the coefficient of the
correction filter 21 for the coefficient of the convolver 12 is described as correction data) is
determined from this transfer characteristic. This is performed by setting the correction data in
the correction filter 21. Hereinafter, elevation angle correction by the correction filter 21 will be
described.
[0041] The transfer characteristic is measured by the measurement system 31. As shown in FIG.
4, the speaker SP is disposed at the upper and lower positions with respect to the center of the
dummy head DM in correspondence with the elevation angle α. And the to-be-measured sound S
when the speaker SP is installed in each position is synchronized with the source sound refS and
recorded in the recorder DAT.
[0022] Next, the frequency response X (S) of the source sound refS and the frequency response Y
(S) of the recorded measured sound S are obtained, and a transfer function corresponding to the
elevation angle α is obtained from these frequency responses.
[0043] The coefficient set in the convolver 12 is based on the assumption that the pair of
speakers SP1 and SP2 are disposed at the front position of the listener's head, so the speaker SP
is horizontal to the microphone MC provided in the dummy head DM. It is based on the position
(position of elevation angle 0 °). Therefore, assuming that the frequency response of the
transfer function transmitted from this position to both ears is H0 (S), and the frequency
response of the measured sound S at this position is Y0 (S), the relationship of the following
(Equation 1) There is.
[0044] Y0 (S) = H0 (S) X (S) (Equation 1) Thus, the frequency response H (S) of the transfer
function at an elevation angle of 0 ° is H0 (S) = Y0 (S) / X (S) It is required in
[0045] Similarly, when the speaker SP is disposed at the elevation angle α n (n = 1, 2, 3), the
frequency response of the sound to be measured S from this position is Y n (S) (n = 1, 2, 3) Since
the above relationship holds, the frequency response Hn (S) of the transfer function at the
elevation angle α is Hn (S) = Yn (S) / X (S).
[0023] Next, the correction data is obtained from the frequency responses H0 (S) and Hn (S) of
the transfer function.
10-05-2019
9
[0047] Even if the pair of speakers SP1 and SP2 are disposed at the position of the elevation
angle α, it may be corrected as if the pair of speakers SP1 and SP2 are in the horizontal position.
That is, the sound output from the speakers SP1 and SP2 installed at the elevation angle α is
transmitted to both ears by the frequency response Hn (S) of the transfer function, but this sound
is transmitted by the frequency response H0 (S) of the transfer function Since the sound should
be heard as if it had arrived, the frequency response of the transfer function for performing
elevation angle correction is H0 (S) / Hn (S). The frequency response H0 (S) / Hn (S) of the
transfer function thus obtained is subjected to inverse FFT transform to obtain an impulse
response, and this impulse response is used as correction data. These processes are performed
on the workstation, and the calculated correction data is stored in the ROM 14 in
correspondence with the elevation angles α1, α2, α3.
[0049] Since the change of the elevation angle α corresponds to the inclination angle θ of the
back 3, the correction data of the correction filter 21 is rewritten according to the inclination
angle of the back 3 detected by the angle detector 24. That is, when the listener rotates the back
3 and changes its inclination angle from θ1 to θ2, it detects that the angle detector 24 has
been changed to the inclination angle θ2, and outputs the detection result to the CPU 13. The
CPU 13 to which the detection result is input reads out the correction data corresponding to the
inclination angle θ2 of the spine 3 from the ROM 14 and sets it in the correction filter 21. Then,
the sound source (X) supplied to the convolver 12 is convoluted and the sound image is localized,
and the signal subjected to the sound image localization processing is further corrected by the
correction filter 21 according to the elevation angle, and the pair of speakers SP1 and SP2 It will
be played from. As a result, the localized sound image can be heard by the listener without
feeling of unnaturalness.
[0025] The CPU for rewriting the correction data of the correction filter 21 may be different
from the CPU 13 for rewriting the coefficients of the convolver 12 in order to simultaneously
perform elevation angle correction and sound image localization.
[0051] Further, since the above correction data differs depending on the structure of the chair,
the amplitude phase characteristics of the speakers SP1 and SP2, etc., the correction data
calculated based on these data is provided using a removable external storage means such as an
IC card. It is also possible. In this case, a RAM (Random Access Memory) for temporarily storing
the correction data is added. Then, when the external storage means is attached, etc., it is
necessary to transfer the correction data stored in the storage means into the RAM and rewrite
the correction data (when the inclination angle of the spine 3 changes Correction data is read out
from this RAM and set in the correction filter 21).
10-05-2019
10
[0026] By the way, in the above embodiment, since the speakers SP1 and SP2 are provided in
front of the seat portion 2, the change amount of the opening angle β by the rotation of the back
3 is small, and the rotation range of the back 3 is the opening angle The amount of change can
be set so as to fall within a predetermined range (a range in which the determination of the
position of the sound source due to the feeling of sound localization is ambiguous). However, as
shown in FIG. 5, in the case of the sound image localization control chair 41 in which the
speakers SP 1 and SP 2 are disposed behind the seat 2, that is, near the pivoting portion of the
back 3, the opening angle by the pivoting of the back 3 In some cases, the amount of change in
β becomes large, and the rotation range becomes extremely small.
[0053] As described above, when the speakers SP1 and SP2 are disposed behind the seat portion
2, only the elevation angle is corrected with the opening angle fixed within the predetermined
range, and when the variation of the opening angle exceeds the predetermined range, Change the
value of the opening angle to make it constant. The second embodiment of the sound image
localization control chair will be described below with reference to FIG.
[0054] Here, in the same figure, when the inclination angle θ of the back 3 is θ1, θ2 and θ3,
the opening angles β are β1, β2 and β3, and the above-mentioned predetermined value that
makes the position judgment of the sound source by the sense of sound image localization
ambiguous The range is β 1 -β 2, and the relationship between the opening angles β 1, β 2
and β 3 is β 1 -β 2 β β 2-β 3. P1, P2 and P3 indicate the center position of the head of the
listener, respectively.
[0056] The opening angle changes from β1 to β2 within the rotation range from θ1 to θ2 of
the inclination angle of the spine 3 and the amount of change is β1−β2, which is within the
above-mentioned predetermined range. Therefore, the sound image localization is performed
using this coefficient using the coefficient calculated with the opening angle as β1 using the
coefficient set in the convolver 12 within this rotation range (inclination angles θ1 to θ2).
[0057] In addition, when the spine 3 is turned to be larger than the inclination angle θ2, the
change amount of the opening angle exceeds the predetermined range β1−β2. Therefore, with
the coefficient calculated based on the opening angle β1, the sound with localized sound image
It becomes unnatural. Therefore, the coefficient to be set in the convolver 12 is switched to one
calculated with the opening angle as β2, and sound image localization is performed using this
coefficient.
10-05-2019
11
[0058] The coefficients of the convolver 12 corresponding to the opening angle are stored in the
ROM 14 as coefficients obtained using the measurement system 31, and the coefficient table is
switched according to the inclination angle θ of the spine 3 .
[0059] The elevation angle correction is performed according to the inclination angle θ of the
spine 3 using the correction filter 21 as in the above-described embodiment.
[0028] As described above, the opening angle is made constant within the rotation range of the
back 3 in which the variation of the opening angle is within the predetermined range with
respect to the opening angle changing due to the rotation of the back 3. The coefficient of the
convolver 12 calculated using the opening angle within the rotation range in the rotation range
where the variation of the opening angle exceeds the predetermined range, using the coefficient
of the convolver 12 calculated using the opening angle And correction is performed only for the
elevation angle within each rotation range, so that even if the amount of change in the opening
angle due to the rotation of the back 3 is large, the correction processing can be simplified, and
this correction The processing makes it possible to reproduce a three-dimensional sound field
without a sense of unnaturalness.
[0061] When the relationship between the open angles β1, β2 and β3 is β1−β2 ≦
β2−β3, the rotation range from the inclination angle θ1 to θ3 for changing the open angle
from β2 to β3 is the above-mentioned open angle The division is performed within a
predetermined range, and the same correction processing is performed.
[0062] Further, the value of the opening angle β which is constant within each rotation range is
an intermediate value of the opening angles within that range (for example, the inclination angle
of the back 3 is constant within the range from θ1 to θ2). It is also possible to set the value to
(β1 + β2) / 2).
[0029] When the chair has an armrest, the pair of speakers SP1 and SP2 of the sound image
localization control chair 1, 41 may be provided at the armrest.
[0064] Furthermore, although the sound image localization control chairs 1 and 41 are singleseat chairs, in the case of a long chair in which two or more listeners can sit in the seat portion 2,
10-05-2019
12
a configuration as shown in FIG. In the figure, the case for two-person use is shown). Hereinafter,
a third embodiment of the sound image localization control chair will be described. The same
reference numerals as in the above embodiment denote the same parts in FIG.
[0065] The sound image localization control chair 51 shown in the figure is common to the seat
52 long in the lateral direction so that a plurality of (two in the figure) listeners can sit, and to the
listener sitting in the seat 52 And a pair of speakers SP1 and SP2 provided in pairs so as to form
a pair for one listener. The plurality of pairs of speakers SP1 and SP2 provided in the seat 52 are
arranged at the same position. That is, as in the case of the sound image localization control chair
1, when the pair of speakers SP1 and SP2 are provided in front of the seat portion 52, the pair of
speakers SP1 and SP2 are arranged in front of the seat portion 52. The same applies to the case
where a speaker is provided behind the seat 52 as in the case of the sound image localization
control chair 41 described above.
[0030] As described above, when a plurality of listeners can be seated in the seat portion, the
back 53 is configured to be commonly rotated with respect to a plurality of listeners seated in
the seat portion 52. If a plurality of speakers SP1 and SP2 are provided as one set for one
listener, and the elevation angle and the opening angle change commonly to a plurality of
listeners sitting on the seat portion 52, sound image localization processing And correction
processing can be made common. As a result, as shown in the figure, sound image localization
control that can supply the same processing sound from one sound image localization control
device 4 to a plurality of pairs of speakers SP1 and SP2 and provides a three-dimensional sound
field to a plurality of listeners The configuration of the chair is simplified. Such a sound image
localization control chair 51 can be used, for example, for a game machine that requires two or
more game operators, and provides a good three-dimensional sound field for each listener. Can.
[0067] In this sound image localization control chair 51, if a sound absorbing partition plate is
provided between the head of the listener and the head of the next listener, the sound from the
speaker provided for the next listener is provided. Field interference can be avoided, and a better
3D sound field can be provided.
[0069] As described above, according to the sound image localization control chair of the present
invention, the seat on which the listener sits, the back rotatably supported by the seat, and the
front with respect to the listener The listener comprises at least a pair of speakers spaced apart
at predetermined elevation and opening angles at the position where the listener sits in the seat
by the reproduced sound from the pair of speakers. A sound image localization control chair that
makes it feel as if a sound image is localized at a different arbitrary position and corrects the
10-05-2019
13
elevation angle and the opening angle that change due to the rotation of the back, wherein the
pair of speakers Since the rotation range of the back is set so that the change amount of the
opening angle falls within a predetermined range, the correction process is performed by
providing a speaker in front of a chair that can rotate the back. Elevation correction only It is
possible. Therefore, the configuration of the sound image localization control device for
providing a sound image to the sound image localization control chair can be simplified, and
moreover, it is possible to reproduce a natural sound image localization feeling.
10-05-2019
14