close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2017143468

код для вставкиСкачать
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 JP2017143468
Abstract: To easily generate HRTFs suitable for a user who realizes good sound image
localization. According to one embodiment, an information processing apparatus includes a first
acquisition unit that acquires a pinnacle angle of a user, and a second acquisition unit that
acquires a designated direction with respect to a head of the user. Further, the information
processing apparatus may further include: a second transfer function based on a user's auricle
angle acquired by the first acquiring unit from a head related transfer function corresponding to
each of a plurality of directions of the head having a specific auricle angle; A third acquisition
unit is provided for acquiring a head related transfer function of the user corresponding to the
designated direction acquired by the acquisition unit. [Selected figure] Figure 1
INFORMATION PROCESSING APPARATUS AND INFORMATION PROCESSING METHOD
[0001]
The present invention relates to an information processing apparatus and an information
processing method.
[0002]
2. Description of the Related Art In the related art, HRTF personalization is an issue in technology
for reproducing stereophonic sound using head related transfer function (HRTF).
Here, the HRTF is a function representing the transfer characteristic from the sound source to
11-04-2019
1
the ear of the viewer, and it is known that the HRTF depends on the physical feature such as the
head shape and the pinna shape of the user. Non-Patent Document 1 corrects the existing HRTFs
based on the pinnae angles (auricle tilt angles) and generates HRTFs of pinna angles closest to
the user's pinna angles, thereby measuring the user's measured HRTFs. It is disclosed that the
tendency of sound image localization used can be reproduced.
[0003]
Hajime Komatsu, 3 others, "Improvement of the system of sound localization in the median plane
by correction of the head transfer function based on the pinna angle," Proceedings of the 2015
Acoustical Conference of the Acoustical Society of Japan, Acoustical Society of Japan, March
2015 , Pp. 879-882
[0004]
However, the technique described in Non-Patent Document 1 requires a correction amount
(correction data) for correcting the HRTF based on the pinnae angle.
Then, in order to prepare this correction data, a plurality of HRTFs are collected using a dummy
head attached with pinnacles by actually changing pinnae angles, and the influence of changes in
pinnacle angles on HRTFs is investigated. There is a need. However, a pinna model that can be
measured by changing the pinna angle is not common, and correction data can not be easily
prepared. Therefore, an object of the present invention is to easily generate an HRTF suitable for
a user who realizes good sound image localization.
[0005]
One aspect of the information processing apparatus according to the present invention includes a
first acquisition unit that acquires a pinnacle angle of a user, a second acquisition unit that
acquires a designated direction with respect to the head of the user, and a specific pinnacle angle
In the designated direction acquired by the second acquisition unit based on the user's pinnacle
angle acquired by the first acquisition unit from a head related transfer function corresponding
to each of a plurality of directions of the head having And third acquisition means for acquiring a
head related transfer function of the corresponding user.
[0006]
According to the present invention, an HRTF suitable for a user who realizes good sound image
11-04-2019
2
localization can be easily generated.
[0007]
It is a block diagram which shows the structure of a HRTF production | generation apparatus.
It is a figure which shows the axis | shaft which becomes a reference | standard of auricle angle.
It is explanatory drawing of the pinnae angle. It is a hardware block diagram of a HRTF
production | generation apparatus. It is a flowchart for demonstrating the operation | movement
in 1st embodiment. It is a block diagram which shows the structure of a three-dimensional sound
reproduction apparatus. It is a figure which shows the gain and direction correction amount of
HRTF in a horizontal surface. It is a flowchart for demonstrating the operation | movement in
2nd embodiment.
[0008]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the accompanying drawings. The embodiment described below is an example as a realization
means of the present invention, and it should be appropriately corrected or changed according to
the configuration of the apparatus to which the present invention is applied and various
conditions. It is not limited to the embodiment of the invention. First Embodiment FIG. 1 is a
block diagram showing a configuration of an HRTF generation apparatus 100 in the present
embodiment. The HRTF generation device 100 is a device for personalizing the HRTF set. Here,
the HRTF set is a data set of head related transfer functions (HRTFs) corresponding to each of a
plurality of directions measured using a dummy head or the head of a specific person. In the
present embodiment, the HRTF generation device 100 corrects the existing HRTFs stored in the
database and generates an HRTF that gives the user a good sense of sound image localization.
The HRTF generation device 100 includes an HRTF correction device 110, a measurement device
120, and an HRTF database (HRTF-DB) 130. The HRTF correction device 110 is a device that
outputs an HRTF set, which is a data set of HRTFs corrected respectively for a plurality of
designated directions, and operates as an information processing device.
[0009]
11-04-2019
3
The measuring device 120 is a device that measures the head shape and pinnae shape of the
user as information on the user's pinnacle angle. In the present embodiment, the measuring
device 120 includes an imaging device such as a camera, measures the user's head shape and
pinnacle shape from a plurality of captured images, and outputs the shape to the HRTF
correction device 110. The HRTF-DB 130 stores the HRTF set and the dummy head or the pinnae
angle information of a specific person who measured the HRTF set in association with each other.
In the present embodiment, the HRTF-DB 130 is assumed to store the HRTF set measured using a
dummy head having a specific pinnacle angle θ D. The HRTF correction device 110 can read the
HRTF set from the HRTF-DB 130 and write the HRTF set to the HRTF-DB 130. FIG. 2 is a diagram
showing an axis which is a reference of the pinna angle. As shown in FIG. 2, in the present
embodiment, an axis parallel to the median axis through the ear hole 210 is the vertical axis 211,
an ear axis (axis passing through the ear holes of both ears) is the horizontal axis 212, and the
ear axis 210 is the longitudinal axis And the axis parallel to the axis are the front and rear axes
213, and the rotation angles with respect to the respective axes 211 to 213 are the pinnae
angles. More specifically, a curved surface including the outer edge of the pinna is approximated
by a plane, and the rotation angle with respect to each axis 211 to 213 of the plane is a pinna
angle.
[0010]
Next, the configuration of the HRTF correction device 110 will be described in detail. The HRTF
correction device 110 includes an pinna angle acquisition unit 111, a direction input unit 112, a
direction correction unit 113, an HRTF acquisition unit 114, and an output unit 115. The auricle
angle acquisition unit 111 acquires the auricle angle θ U of the user based on the data of the
head shape and the auricle shape measured by the measuring device 120. Further, the pinnacle
angle acquiring unit 111 acquires the pinnacle angle θ D of the dummy head used for the
measurement of the HRTF set stored in the HRTF-DB 130. The pinnacle angle acquisition unit
111 outputs the acquired pinnacle angles θ U and θ D to the direction correction unit 113. The
direction input unit 112 inputs a plurality of designated directions respectively corresponding to
the HRTFs constituting the newly generated HRTF set. The designated direction can be
designated by the horizontal angle θ A and the elevation angle θ E. The direction input unit
112 may input any of a plurality of designated directions (angles) according to a user's
instruction, or may input a plurality of designated directions (angles) set in advance. Direction
input unit 112 outputs the input designated direction to direction correction unit 113 and output
unit 115.
11-04-2019
4
[0011]
The direction correction unit 113 corrects the designated direction input from the direction input
unit 112 based on the user's pinnacle angle θ U acquired by the pinnacle angle acquisition unit
111 and the pinnacle angle θ D of the dummy head. . An example of correction of the horizontal
angle θ A which is an angle of the designated direction in the horizontal direction (rotational
direction around the vertical axis 211) is shown in FIG. Here, the pinnacle attachment angle in
the horizontal direction of the dummy head 220 obtained by measuring the HRTF set stored in
the HRTF-DB 130 is the pinnacle angle θ D shown in FIG. 3A and the pinnacle angle in the
horizontal direction of the user 230 Is the pinnae angle .theta..sub.U shown in FIG. 3 (b). In this
case, the corrected horizontal angle θ A ′ of the input horizontal angle θ A is expressed by the
following equation. θ A ′ = θ A + (θ D −θ U) (1) That is, the direction correction unit 113
corrects the difference value between the pinna angle θ U of the user 230 and the specific pinna
angle θ D The amount Δθ (= θ D −θ U) is corrected to correct the designated direction. The
correction in the designated direction as described above is performed for each of the three axes
(the vertical axis 211, the horizontal axis 212, and the longitudinal axis 213) described above. In
addition, it is done for the left and right ears respectively. The direction correction unit 113
outputs the corrected designated direction to the HRTF acquisition unit 114.
[0012]
The HRTF acquisition unit 114 acquires an HRTF corresponding to the corrected designated
direction input from the direction correction unit 113 from the HRTF-DB 130 and outputs the
HRTF to the output unit 115. When the HRTF corresponding to the designated direction input
from the direction correction unit 113 does not exist in the HRTF-DB 130, the HRTF acquisition
unit 114 acquires nearest data as the corresponding HRTF. The output unit 115 associates the
HRTF input from the HRTF acquisition unit 114 with the designated direction input from the
direction input unit 112, and outputs it to the HRTF-DB 130 to register as a new HRTF set. In this
way, the HRTF generation device 100 corrects the rotation of the existing HRTF set stored in the
HRTF-DB 130 based on the user's pinnae angle θ U and sets it as an HRTF set corresponding to
the user's pinnae angle θ U Generate a new one. More specifically, the HRTF generation device
100 rotates the existing HRTF set by an angle corresponding to the difference value between the
user's pinnae angle θ U and the specific pinnacle angle θ D corresponding to the existing HRTF
set. to correct. The rotation correction is performed on all of the vertical axis 211, the horizontal
axis 212, and the longitudinal axis 213.
[0013]
11-04-2019
5
FIG. 4 is a diagram showing a hardware configuration of the HRTF generation device 100. As
shown in FIG. The HRTF generation device 100 includes a CPU 11, a ROM 12, a RAM 13, an
external memory 14, an input unit 15, a communication I / F 16, and a system bus 17. The CPU
11 centrally controls the operation of the HRTF generation device 100, and controls each
component (12 to 16) via the system bus 17. The ROM 12 is a non-volatile memory that stores
programs necessary for the CPU 11 to execute processing. The program may be stored in the
external memory 14 or a removable storage medium (not shown). The RAM 13 functions as a
main memory and a work area of the CPU 11. That is, the CPU 11 loads a necessary program
from the ROM 12 to the RAM 13 when executing processing, and executes the loaded program
to realize various functional operations.
[0014]
The external memory 14 stores various data and various information necessary when the CPU
11 performs processing using a program. For example, the external memory 14 is the HRTF-DB
130 of FIG. The external memory 14 may store various data and various information obtained by
the CPU 11 performing processing using a program. The input unit 15 is configured of a
keyboard, an operation button, and the like, and the user can operate the input unit 15 to input
the designated direction (angle) described above. The communication I / F 16 is an interface for
communicating with an external device. The system bus 17 communicably connects the CPU 11,
the ROM 12, the RAM 13, the external memory 14, the input unit 15, and the communication I /
F 16. The functions of the respective units of the HRTF generation device 100 shown in FIG. 1
can be realized by the CPU 11 executing a program. However, at least a part of the units of the
HRTF generation device 100 illustrated in FIG. 1 may operate as dedicated hardware. In this case,
dedicated hardware operates based on the control of the CPU 11.
[0015]
Next, the operation of the HRTF generation device 100 will be described with reference to FIG.
The process of FIG. 5 can be realized by the CPU 11 executing a program. However, the process
of FIG. 5 may be realized by operating at least a part of the respective elements shown in FIG. 1
as dedicated hardware. In this case, dedicated hardware operates based on the control of the CPU
11. First, in S1, the measuring device 120 measures the head shape and the pinna shape of the
user. Next, in S2, the pinnacle angle acquiring unit 111 acquires shape data of the user's head
and pinnae measured by the measuring device 120 in S1, and acquires the user's pinnacle angle
11-04-2019
6
θ U from the acquired shape data. . In addition, in S2, the pinnacle angle acquiring unit 111
acquires, from the HRTF-DB 130, a specific pinnacle angle θ D corresponding to the HRTF set
stored in the HRTF-DB 130.
[0016]
Next, in S3, the direction input unit 112 inputs a designated direction corresponding to the newly
generated HRTF. In this embodiment, the HRTF generation device 100 generates an HRTF set
suitable for the user, and the direction input unit 112 inputs a plurality of designated directions
(horizontal angle θ A and elevation angle θ E) with respect to the user's head. It shall be. Note
that the direction input unit 112 may input only one designated direction. Next, in S4, the
direction correction unit 113 corrects the designated direction input in S3. At this time, the
direction correction unit 113 calculates the correction amount for correcting the designated
direction based on the pinnae angle θ U of the user and the pinnacle angle θ D of the dummy
head acquired in S2, and the calculated correction amount Respectively correct the plurality of
designated directions. Next, in S5, the HRTF acquisition unit 114 acquires, from the HRTF-DB
130, an HRTF corresponding to the designated direction corrected in S4.
[0017]
In S6, the HRTF acquisition unit 114 determines whether the correction is completed for all of
the designated directions input in S3, and the corresponding HRTF is acquired. Then, if the HRTF
acquisition unit 114 determines that the designated direction in which the HRTF is not acquired
exists, the process returns to S5, and if it is determined that the HRTFs can be acquired in all the
designated directions, the process proceeds to S7. In S7, the output unit 115 associates the
designated direction input in S3 with the HRTF acquired in S5, and records it as a new HRTF set
in the HRTF-DB 130. In addition, the HRTF generation device 100 acquires information derived
from the HRTF, such as the shape of the user's ear, in S1 as well, for example, and corrects the
HRTF acquired from the HRTF-DB 130 in S5 based on the information derived from the HRTF.
May be output as the HRTF of the user.
[0018]
As described above, the HRTF generation device 100 acquires the pinnacle angle θ U of the user
and acquires the designated direction with respect to the head of the user. Then, the HRTF
11-04-2019
7
generation device 100 corrects the acquired designated direction based on the pinnae angle θ U
of the user, and acquires the HRTF corresponding to the corrected designated direction from the
HRTF-DB 130. Here, the HRTF-DB 130 is a database in which HRTFs respectively corresponding
to sound sources in a plurality of directions with respect to the head having a specific pinnacle
angle θ D are stored. Here, the designation direction may be plural. That is, the HRTF generation
device 100 can correct angle information of each HRTF that configures the existing HRTF set
stored in the HRTF-DB 130, and generate a new HRTF set. The HRTF generation device 100
derives the correction amount Δθ for correcting the designated direction based on the
difference value between the user's pinnacle angle θ U and the specific pinnacle angle θ D, and
designates using the correction amount Δθ Correct the direction.
[0019]
As described above, the HRTF generation device 100 corrects the angle information of the
existing HRTF set to generate a new HRTF set corresponding to the user's pinnae angle θ U, thus
simplifying personalization of the HRTF set. It can be realized. In personalizing the HRTF set, it is
only necessary to prepare the HRTF set corresponding to a specific pinnacle angle θ D, and as in
the conventional method, a plurality of HRTFs collected using a plurality of dummy heads with
different pinna angles There is no need to prepare a set. Furthermore, since this method is a
method of rewriting the angle information of the existing HRTF set according to the user's pinnae
angle θ U, HRTF correction data (correction coefficient) as used in the conventional method is
also unnecessary.
[0020]
Further, the HRTF generation device 100 derives the difference value between the user's
pinnacle angle θ U and the specific pinnacle angle θ D as the correction amount Δθ, and
corrects the designated angle by adding the correction amount Δθ to the designated angle. Do.
That is, the HRTF generation device 100 generates an HRTF set corresponding to the pinnae
angle θ U of the user by performing rotation correction on the existing HRTF set by the
difference value. Thus, based on the HRTF set corresponding to the specific pinnacle angle θ D
different from the user's pinnae angle θ U, the HRTF set corresponding to the user's pinna angle
θ U, that is, a good sound image localization It is possible to easily generate an HRTF suitable for
the user who realizes.
[0021]
11-04-2019
8
Furthermore, the HRTF generation device 100 acquires, as the pinnae angle θ U of the user, a
rotation angle about an axis parallel to the median axis, ear axis, and longitudinal axis of the
pinna of the user. As described above, since the HRTF generation device 100 can correct the
HRTF set in each direction not only in the horizontal direction but also in the vertical direction
and the front-back direction, the HRTF set can be corrected to the user's pinnae angle θ U The
corresponding HRTF set can be generated appropriately. Further, the HRTF generation device
100 acquires the pinnacle angle θ U of the user based on the information on the head shape and
pinnacle shape of the user measured by the measurement device 120. Therefore, the HRTF
generation device 100 can correct the existing HRTF set based on the user's exact pinnacle angle
θ U.
[0022]
In the present embodiment, the case has been described where the measuring device 120 is a
device that measures information related to the pinnae angle of the user using an imaging device
such as a camera. However, the measuring device 120 may be a device that measures the
pinnacle angle by an object shape acquisition technique using an infrared laser. Furthermore, the
measuring device 120 may be configured to measure the pinnae angle using a measuring
instrument such as a ruler or a protractor. Further, the pinnacle angle acquiring unit 111 does
not acquire the pinnacle angle θ U of the user from the measuring device 120, but acquires the
pinnacle angle θ U of the user based on the information on the pinnacle angle input by the user.
May be The user may numerically input his pinnacle angle, or may input information on his or
her head shape and pinnacle shape.
[0023]
Further, in the present embodiment, the HRTF set stored in the HRTF-DB 130 is one in which
HRTFs respectively corresponding to a plurality of designated directions measured in one setting
environment are regarded as one data set. However, the HRTF set stored in the HRTF-DB 130
may be a combination of HRTF sets of a plurality of different persons, or a data set of HRTFs
measured in a plurality of environments. Furthermore, in the present embodiment, as shown in
FIG. 2, the origin of the axis representing the rotation of the pinnacle angle is the ear hole 210,
but the axes representing the rotation of the pinna angle are the axes 211 to 213 shown in FIG.
The vertical axis may be, for example, a median axis passing through the center of the head. The
pinnae angle may be expressed by a rotation angle around at least one axis among the axes 211
11-04-2019
9
to 213 parallel to the median axis, the ear axis, and the longitudinal axis.
[0024]
Further, in the present embodiment, the HRTF correction device 110 corrects the designated
direction for each ear by the direction correction unit 113, and generates the HRTF sets of both
ears. However, if the angles of both ears are substantially the same, the HRTF correction device
110 may horizontally reverse the newly generated HRTF set for one ear to obtain the HRTF set of
the opposite ear. Furthermore, in the present embodiment, when there is no HRTF corresponding
to the designated direction corrected by the direction correction unit 113, the HRTF acquisition
unit 114 acquires closest data. However, in such a case, the HRTF acquisition unit 114 may
acquire the HRTF corresponding to the designated direction corrected by the direction correction
unit 113 by data interpolation. That is, the HRTF acquisition unit 114 acquires a plurality of
HRTFs corresponding to a direction near the designated direction corrected by the direction
correction unit 113 from the HRTF-DB 130, interpolates the acquired plurality of HRTFs, and
acquires a corresponding HRTF. May be This makes it possible to properly obtain the
corresponding HRTFs even in the region where the angular resolution of the HRTF set is coarse.
[0025]
Further, in the present embodiment, the case has been described in which the HRTF generation
device 100 generates a new HRTF set based on a plurality of designated directions input by the
direction input unit 112. However, the HRTF generation device 100 may generate a new HRTF
set based on the existing HRTF set stored in the HRTF-DB 130. That is, the HRTF generation
device 100 can also generate a new HRTF set without inputting a designated direction by the
direction input unit 112. In this case, the HRTF acquisition unit 114 acquires an existing HRTF
set from the HRTF-DB 130. The direction correction unit 113 also corrects the direction
corresponding to the existing HRTF set described above based on the pinnae angle θ U of the
user and the pinnae angle θ D of the dummy head. Then, the output unit 115 replaces the precorrection direction data corresponding to the existing HRTF set with the direction data
corrected by the direction correction unit 113, and outputs it as a new HRTF set.
[0026]
Second Embodiment Next, a second embodiment of the present invention will be described. In
11-04-2019
10
the first embodiment described above, the HRTF generation device that corrects the existing
HRTF set and generates a new HRTF set has been described. In the second embodiment, a
stereophonic sound reproducing apparatus that reproduces stereophonic sound by generating
and replaying a stereophonic sound signal using the HRTF set will be described. FIG. 6 is a block
diagram showing the configuration of the three-dimensional sound reproducing apparatus in the
second embodiment. The three-dimensional sound reproduction apparatus in the present
embodiment includes a three-dimensional sound generation apparatus 300 and an output
apparatus 400. The three-dimensional sound generation device 300 includes the HRTF
correction device 110 a, the HRTF-DB 130, the pinna angle database (hereinafter, pinna angle
DB) 140, the acoustic signal input unit 151, the filter operation unit 152, and the acoustic signal
output unit And 153.
[0027]
The HRTF correction device 110a is a device that outputs the corrected HRTF for one designated
direction, and operates as an information processing device. In the present embodiment, the
designated direction is the direction (sound source direction) of the sound source reproduced by
the 3D sound reproducing apparatus. The HRTF-DB 130 has the same configuration as the first
embodiment described above. The pinna angle DB 140 is a database in which a dummy head or a
specific pinna angle θ D of a specific person who measured the HRTF set stored in the HRTF-DB
130 and a pinna angle θ U of the user are stored. The HRTF correction device 110a can read out
the pinnae angle θ D and pinnae angle θ U from the pinnae angle DB 140.
[0028]
The acoustic signal input unit 151 acquires, for each sound source, input acoustic signals of a
plurality of channels for three-dimensional acoustic reproduction, and outputs the acquired input
acoustic signals to the filter operation unit 152. The filter operation unit 152 convolutes HRTFs
corresponding to the sound source direction output from the HRTF correction device 110 a with
respect to each of the input sound signals input from the sound signal input unit 151, and
outputs an output sound signal as an sound signal output unit 153. Output to The acoustic signal
output unit 153 adds the output acoustic signal filtered for each sound source input from the
filter operation unit 152 for each channel, performs D / A conversion, and outputs the result to
the output device 400. The output device 400 is, for example, a headphone or an ear phone.
When the output device 400 is a headphone, the acoustic signal output unit 153 mixes the Lch
signal and the Rch signal in which the HRTFs are convoluted for each sound source, respectively,
and outputs the mixed signal as a two-channel signal.
11-04-2019
11
[0029]
Hereinafter, the HRTF correction device 110a will be specifically described. The HRTF correction
device 110a includes an pinna angle acquisition unit 111a, a direction input unit 112a, a
direction correction unit 113a, an HRTF acquisition unit 114a, and an output unit 115a. The
pinnae angle acquisition unit 111a acquires the pinnacle angle θ D and the pinnacle angle θ U
of the user from the pinnacle angle DB 140, and outputs the acquired pinnacle angles θ D and
θ U to the direction correction unit 113a. The direction input unit 112a acquires the sound
source direction of the input sound signal of the plurality of channels acquired by the sound
source acquisition unit 150 as the designated direction, and outputs the acquired sound source
direction to the direction correction unit 113a. The direction correction unit 113a sets the
correction amount Δθ based on the pinna angles θ D and θ U input from the pinnae angle
acquisition unit 111a. Then, direction correction unit 113a corrects each sound source direction
by adding the set correction amount Δθ to the plurality of sound source directions input from
direction input unit 112a, and outputs the corrected sound source direction to HRTF acquisition
unit 114a. Specifically, when generating the HRTF for the left ear, as shown in FIG. 7A, the
direction correction unit 113a corrects the correction amount Δθ in the head front direction (0
[rad]) by (θ D −θ U) Set the correction amount Δθ in the direction of the opposite ear (right
ear) side (−π / 2 [rad]) to 0. Further, the direction correction unit 113a linearly interpolates
between the head front direction and the reverse ear side direction. Thus, the direction correction
unit 113a sets different correction amounts Δθ for each designated direction. The same applies
to the case of generating the HRTF for the right ear.
[0030]
The amplitude of the HRTF in the horizontal plane with respect to the left ear is maximum in the
auricle direction (near .pi. / 2 [rad]) as shown in FIG. There is a characteristic that it becomes
minimum at (near -π / 2 [rad]). If the correction amount (θ D −θ U) is uniformly applied to
such characteristics regardless of the direction, the angle (θ D −θ U) from the opposite ear side
direction (near to −π / 2 [rad]) is applied. The amplitude of the HRTF is minimized in the
direction deviated by the above, and the sense of hearing discomfort is generated. Therefore, the
direction correction unit 113a sets the correction amount Δθ to a predetermined value or less
(0 in the present embodiment) so that the amplitude of the HRTF in the opposite ear direction is
minimum or smaller than a predetermined value. Although only the HRTF amplitude in the
horizontal plane has been described here, the same applies to the vertical plane. Also in the
vertical plane, the amplitude of the HRTF is maximum in the pinnacle direction (front direction of
11-04-2019
12
the head) and is minimum in the back side direction of the head with respect to the pinna
direction. Therefore, the correction amount Δθ in the back side direction of the head with
respect to the auricle direction is set to a predetermined value or less (for example, 0).
[0031]
Returning to FIG. 6, the HRTF acquisition unit 114 a acquires, from the HRTF-DB 130, an HRTF
corresponding to the corrected sound source direction input from the direction correction unit
113 a. The HRTF acquisition unit 114a outputs the acquired HRTF to the output unit 115a. The
output unit 115a outputs the HRTF for each sound source acquired by the HRTF acquisition unit
114a to the filter operation unit 152. The three-dimensional sound generation device 300 has
the same hardware configuration as the HRTF generation device 100 shown in FIG. The functions
of the units shown in FIG. 6 can be realized by the CPU of the three-dimensional sound
generation device 300 executing a program. However, at least a part of the units of the threedimensional sound generation apparatus 300 illustrated in FIG. 6 may operate as dedicated
hardware. In this case, dedicated hardware operates based on the control of the CPU.
[0032]
Next, the operation of the three-dimensional sound generation apparatus 300 will be described
with reference to FIG. The process of FIG. 8 can be realized by the CPU executing a program.
However, the process of FIG. 8 may be realized by operating at least a part of the respective
elements shown in FIG. 6 as dedicated hardware. In this case, dedicated hardware operates under
control of the CPU. First, in S11, the acoustic signal input unit 151 inputs an input acoustic signal
for each sound source. Next, in S12, the direction input unit 112a inputs a sound source
direction corresponding to each sound source acquired in S11. In S13, the pinnacle angle
acquiring unit 111a acquires the pinnacle angle θ D and the pinnacle angle θ U of the user
from the pinnacle angle DB 140.
[0033]
Next, in S14, the direction correction unit 113a corrects the sound source direction input in S12.
In S14, the direction correction unit 113a determines the correction amount Δθ based on the
pinnae angles θ D and θ U acquired in S13, and corrects the sound source direction input in
S12 using the determined correction amount Δθ. Do. At S15, the HRTF acquisition unit 114a
11-04-2019
13
acquires an HRTF corresponding to the sound source direction corrected at S14 from the HRTFDB130. In S16, the output unit 115a outputs the HRTFs corresponding to each sound source
acquired in S15 to the filter operation unit 152. In S17, the filter operation unit 152 performs
filtering on the input acoustic signal acquired in S11 using the HRTF input from the output unit
115a for each sound source. Finally, in S18, the acoustic signal output unit 153 mixes the signals
filtered for each sound source for each channel, performs D / A conversion, and outputs the
mixed signals to the output device 400.
[0034]
As described above, in the present embodiment, the 3D sound reproducing apparatus reproduces
3D sound using the HRTF newly generated according to the user's pinnae angle θ U. The newly
generated HRTF is an HRTF corresponding to the sound source direction which is generated and
acquired with the sound source direction of the input sound signal as the designated direction.
The three-dimensional sound generation device 300 acquires an input sound signal, convolutes
the HRTF corresponding to the above sound source direction with the input sound signal, and
outputs an output sound signal to the output device 400. The output device 400 reproduces the
output acoustic signal output. Thereby, stereophonic sound reproduction with an improved sense
of localization can be realized. Here, as described above, the HRTF correction device 110a may
derive different correction amounts Δθ according to the designated direction (sound source
direction). Specifically, when the designated direction is the front direction (first direction) of the
head, the HRTF correction device 110a calculates the difference value between the user's pinna
angle θ U and the specific pinna angle θ D (first Is derived as the correction amount Δθ.
Thereby, the three-dimensional sound reproducing apparatus can improve the sense of
localization at the median plane.
[0035]
Further, when the designated direction is the back side direction (second direction) of the head
with respect to the auricle direction, the HRTF correction device 110a derives the correction
amount Δθ to a predetermined value or less (for example, 0). Thereby, the three-dimensional
sound reproducing apparatus can reduce the sense of incongruity in the sense of hearing caused
by the displacement of the direction in which the amplitude of the HRTF is minimum.
Furthermore, when the designated direction is between the first direction and the second
direction, the HRTF correction device 110a derives a value obtained by interpolating between the
first value and the second value as the correction amount Δθ. Thus, the three-dimensional
sound reproducing apparatus can smoothly change the correction amount Δθ, and can reduce
11-04-2019
14
discomfort.
[0036]
Further, since the pinnacle angle acquiring unit 111a of the HRTF correction device 110a
acquires the pinnacle angle θ U of the user from the pinnacle angle DB 140, it is possible to
easily acquire the pinnacle angle θ U of the user. Note that the auricle angle acquisition unit
111a acquires the auricle angle θ U of the user based on the information on the auricle angle of
the user measured by the measuring device 120, as in the first embodiment described above.
May be Further, the pinnacle angle acquiring unit 111a may acquire the pinnacle angle θ U of
the user based on the information on the pinnacle angle input by the user. In the present
embodiment, the acoustic signal output unit 153 outputs the D / A-converted signal to the output
device 400. However, the acoustic signal output unit 153 outputs the D / A-converted output
acoustic signal to a recording device or the like. It may be configured as follows. Other
Embodiments The present invention supplies a program that implements one or more functions
of the above-described embodiments to a system or apparatus via a network or a storage
medium, and one or more of the computer of the system or apparatus are provided. It can also be
realized by a process in which a processor reads and executes a program. It can also be
implemented by a circuit (eg, an ASIC) that implements one or more functions.
[0037]
DESCRIPTION OF SYMBOLS 100 ... HRTF generation apparatus, 110, 110a ... HRTF correction
apparatus, 111, 111a ... Auricle angle acquisition part, 112, 112a ... Direction input part, 113,
113a ... Direction correction part, 114, 114a ... HRTF acquisition part, 115, 115a ... output part,
130 ... HRTF-DB, 300 ... three-dimensional sound generation device
11-04-2019
15
Документ
Категория
Без категории
Просмотров
0
Размер файла
28 Кб
Теги
description, jp2017143468
1/--страниц
Пожаловаться на содержимое документа