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DESCRIPTION JP2013013042

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DESCRIPTION JP2013013042
Abstract: A stereoscopic sound device capable of accurate "stereoscopic localization of sound"
even if the "speaker position" and the "ear" are separated in a vehicle interior space in which
sound reflection and booming sound are likely to occur. provide. SOLUTION: The binaural
recording stored by the reproduction sound source unit 4 is a recording in which ultrasonically
modulated sound is provided from the recording ultrasonic speaker 6 to the dummy head 1 and
thus crosstalk is suppressed and sound is A binaural recording in which localization information
is clear can be obtained, and localization of the pronunciation direction can be enhanced. Further,
the ultrasonically modulated sound of the binaural recording stored in the reproduction sound
source unit 4 is directed from the reproduction ultrasonic speaker 7 installed at a position away
from the driver's head α to the left and right ears of the driver. By giving it, "3D information of
sound" related to localization in the direction of sound generation can be accurately given to the
"ears" of the driver, and even without using headphones in a vehicle interior where reflection of
sound and booming noise are likely to occur Accurate "stereo localization of sound" can be
reproduced. [Selected figure] Figure 1
3D sound system
[0001]
The present invention uses the left and right speakers (two-channel speakers) to give the user
“stereoscopic localization of sound (localization of sound“ front and rear, ”“ front and rear,
left and right, “left and right front and rear, up and down, etc.”) 3D) The present invention
relates to a three-dimensional sound apparatus used in a narrow space such as a cabin where a
sound reflection and a booming sound are likely to be generated. The present invention relates to
a technique suitable for use in a vehicle voice device (navigation system, alerting device, etc.).
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1
[0002]
As a three-dimensional sound apparatus that gives the user three-dimensional localization of
sound using two speakers on the left and right, a technique of "binaural recording + headphone
reproduction" is known (see, for example, Patent Document 1).
In binaural recording, the left and right microphones (abbreviated microphones) are placed on
the left and right simulated ears of the dummy head to perform recording, and the recorded
binaural recording (recording material) is used as the headphones (directly to the ears).
Loudspeaker: This technology enables stereo localization of sound by direct reproduction with
the left and right ears using the ear speaker.
[0003]
Although it is difficult for a playback device to perform stereo localization of sound, in “binaural
recording + headphone playback”, “position of microphone (position of false ear) at the time of
recording and By matching the position of the ear), it is possible to “accurately reproduce” 3D
information of sound (sound information related to stereo localization of sound) in the “ear”.
[0004]
However, when "speaker position" and "ear" are separated, crosstalk occurs in which the sound of
one speaker reaches the other ear, and "sound 3D information" is accurately reproduced in "ear".
Can not be done, and accurate “stereoscopic sound localization” becomes difficult.
For this reason, "binaural recording + headphone reproduction" has been mainstream as a
reproduction apparatus that performs accurate "stereoscopic sound localization" using a twochannel speaker.
[0005]
In recent years, there has been a demand for a three-dimensional sound apparatus capable of
three-dimensional localization of sound even if a speaker is disposed at a position away from the
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2
ear without using headphones. In response to this requirement, various techniques have been
developed for a long time, such as the development of techniques such as crosstalk canceller
using a computer for the left and right signal phases of stereo recording. However, in a threedimensional sound apparatus that does not use headphones, the technology of freely localizing
sound at an arbitrary position has a disadvantage that it can be applied only in a wide space
without reflection of sound or booming sound.
[0006]
Japanese Patent Application Laid-Open No. 5-153687
[0007]
The present invention has been made in view of the above-mentioned problems, and its object is
to "speaker position" and "ears" in a narrow space such as a cabin where reflection of sound and
booming noise are likely to occur. It is an object of the present invention to provide a
stereophonic sound device capable of accurate "stereoscopic localization of sound" even if it is
separated.
[0008]
According to the first aspect of the present invention, in the binaural recording (recording
material) stored by the sound source unit for reproduction, an ultrasonic wave modulated sound
in which an audible sound is ultrasonically modulated (modulated to an ultrasonic frequency) is
generated from an ultrasonic speaker for recording. It was recorded.
Since ultrasonic waves have high directivity (high linearity), the spread of sound (cross talk) can
be suppressed, and binaural recording (sound recording) in which the localization information of
the sound is clear can be obtained.
As described above, compared to the existing binaural recording (a binaural recording based on
“a normal sound not subjected to ultrasonic modulation”), it is possible to obtain a binaural
recording (recording) whose localization in the direction of sound generation is dramatically
higher.
[0009]
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On the other hand, the two-channel reproduction means ultrasonically modulates the binaural
recording stored in the sound source unit for reproduction, and the ultrasonically modulated
ultrasonic wave modulated sound is placed at a position away from the user's head. The
ultrasonic speaker for ultrasound (the ultrasonic speaker used at the time of reproduction) is
provided to the user's left and right ears. As described above, ultrasonic waves have high
directivity (high straightness), so that the spread of the sound can be suppressed and pinpointed
can be accurately given "recorded sound" to the left and right ears. it can. That is, even in a
vehicle interior in which sound reflection and booming noise are likely to occur, “sound 3D
information” can be “accurately reproduced” in each of the right and left ears of a person.
[0010]
As described above, in the stereophonic sound device according to claim 1, even when "the
position of the speaker (specifically, the position of the ultrasonic speaker for reproduction)" and
the "ear" are separated, "the sound of the binaural recording Since "3D information" can be
accurately reproduced by "ears", the sound generation direction can be freely localized at any
position without using headphones. That is, even if the "speaker position" and the "ear" are
separated in a narrow space such as a cabin where reflections of sounds and booming sounds are
likely to occur, accurate "stereoscopic localization of sound" becomes possible.
[0011]
According to the second aspect of the present invention, the binaural recording stored by the
reproduction sound source unit in claim 2 is a recorded material recorded using the left and right
microphones disposed on the left and right pseudo ears of a dummy head imitating a human
head. The dummy head used for binaural recording is provided with left and right simulated
external ear canals that at least imitate the left and right external auditory canals of a person, and
the left and right microphones are disposed inside (the far part) of the left and right simulated
external ear canals It is. As a result, the "sounds used for recording" are recorded by the left and
right microphones while including the influence of the ear canal. For this reason, the accuracy of
the "3D information of sound" included in the binaural recording can be improved, and as a
result, the accuracy of "stereoscopic localization of sound" in a stereophonic sound device that
does not use headphones can be improved.
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[0012]
[Means of claim 3] The ultrasonic transducers for reproduction on the left and right sides in
claim 3 are arranged such that the irradiation axes of the respective ultrasonic waves are
directed inward on the user side than in parallel (inward arrangement). . By this, the ultrasonic
modulation sound emitted from the reproduction ultrasonic speaker reaches the tympanic
membrane while the influence of the user's external ear canal is suppressed, and the accuracy of
the "3D information of sound" given to the tympanic membrane is increased. Can. Therefore,
even if the left and right reproduction ultrasonic speakers are separated from the head of a
person, it can be closer to the use of headphones that emit sound toward the tympanic
membrane. The accuracy of localization can be improved.
[0013]
[Means of claim 4] The three-dimensional sound apparatus of claim 4 is used for a vehicle voice
apparatus (such as a navigation system or a warning apparatus) that gives "information on
direction" to an occupant of a car. As described above, since the present invention enables
accurate "stereoscopic sound localization" without using headphones, it can be mounted on a
vehicle. In addition, it is possible to quickly make the passenger recognize the directionality of
the "information about direction" by the localization direction of the sound. That is, the "direction
recognition time" of the occupant can be shortened. If a concrete example of understanding
assistance is explained, “right and left” for the passenger by “locate the information on the
direction” “Please pay attention to the right and back” by the stereo sound system to the
passenger “right and back” It is possible to make people recognize quickly.
[0014]
According to the fifth aspect of the present invention, in the binaural recording (recording
material) stored by the sound source unit for reproduction, an ultrasonic modulation sound
generated from an ultrasonic speaker for recording is applied to a reflection target object, and
the reflection target object It includes those recorded with the reflected sound reflected by (for
example, a person or a car). The two-channel reproducing means ultrasonically modulates the
binaural recording of the reflected sound stored in the sound source unit for reproduction, and
places the ultrasonically modulated ultrasonic wave modulated sound at a position away from
the head of the user It is given to the user's left and right ears from the left and right
reproduction ultrasonic speakers.
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[0015]
The reflected sound reflected by the reflection target includes auditory information of
"information of the reflection target (for example, distance information, shape information, size
information, material information, etc.)". Therefore, by reproducing the reflected sound, the user
can obtain "information of the reflection object (for example, distance information, shape
information, size information, material information, etc.)" as well as "direction information of
sound". Can be given.
[0016]
(A) Configuration of recording equipment used for binaural recording, (b) Configuration of threedimensional sound apparatus (Example 1). FIG. 7 is a layout explanatory view of left and right
reproduction ultrasonic speakers (Example 1). It is a frequency characteristic figure of sound
recording using a dummy head (example 1). It is a frequency characteristic figure in arrangement
| positioning of the ultrasonic speaker for reproduction | regeneration on either side (Example 1).
(A) Explanatory drawing of the cautions which a caution direction determination means
determines, (b) It is explanatory drawing of localization of a sound (Example 2). (A) Explanatory
drawing of the cautions which a warning direction determination means determines, (b) It is
explanatory drawing of localization of a sound (Example 3). (A) It is a block diagram of recording
equipment used for binaural recording (Example 4).
[0017]
[Mode for carrying out the invention] will be described with reference to the drawings. The threedimensional acoustic device is applied to a narrow space such as a cabin where reflections of
sound and booming noise are likely to occur. The three-dimensional acoustic device is disposed
at the left and right artificial ears 2 of the dummy head 1 imitating a human head. A
reproduction sound source unit 4 for storing 2-channel binaural recordings recorded using the
left and right microphones 3; 2-channel reproduction means 5 for reproducing the binaural
recordings stored in the reproduction sound source unit 4; Do.
[0018]
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The binaural sound recording (sound recording material) stored by the sound source unit 4 for
reproduction is obtained by applying ultrasonic modulation sound obtained by ultrasonic
modulation of an audible sound from the ultrasonic speaker 6 for recording to the dummy head
1. Further, the left and right pseudo ears 2 in the dummy head 1 used for binaural recording are
provided with the pseudo pinna 2a and the pseudo external ear canal 2b imitating the human
outer ear, and the left and right microphones 3 Will be placed in
[0019]
The two-channel reproducing means 5 is, for example, mounted on a car, ultrasonically
modulates the binaural recording stored in the sound source unit 4 for reproduction, and the
driver modulates the ultrasonically modulated sound modulated by the ultrasonic wave. ) From
the ultrasonic speaker 7 for reproduction on the left and right placed at a position away from the
head α of the head) to the respective ears on the left and right of the driver. In addition, the left
and right reproduction ultrasonic wave speakers 7 are arranged (inwardly arranged) so that the
irradiation axes of the respective ultrasonic waves are directed inward of parallel.
[0020]
In the following, specific examples (examples) in which the present invention is applied to a
vehicle voice apparatus will be described with reference to the drawings. It is needless to say that
the following examples show specific examples, and the present invention is not limited to the
examples. In the following examples, the same reference numerals as those in the abovementioned "embodiment of the invention" indicate the same functional objects.
[0021]
Example 1 Example 1 will be described with reference to FIGS. 1 to 4. The vehicle voice device of
this embodiment is a warning device for giving the driver "information about direction" by voice,
and as shown in FIG. A reproduction sound source unit 4 for storing 2-channel binaural
recordings (recordings) recorded using the left and right microphones 3 arranged in the ears 2;
Reproduction of the binaural recordings stored in the reproduction sound source unit 4 And a
two-channel reproducing unit 5.
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[0022]
(Description of binaural recording stored by the playback sound source unit 4) In binaural
recording stored by the playback sound source unit 4, ultrasonic modulated sound of an audible
sound is applied to the dummy head 1 from the ultrasonic speaker 6 for recording. An example
of the recording will be described with reference to FIG. 1 (a). In binaural recording, recording is
performed to record the "sound used for recording" captured by the sound wave generator 11 for
recording, which gives the dummy head 1 "sound to be used for recording", and the microphones
3 on the left and right of the dummy head 1 The device 12 is used.
[0023]
The dummy head 1 used for binaural recording is provided with a simulated pinna 2a (such as an
earlobe projecting from the head to the left and right) and a simulated external ear canal 2b (a
so-called earhole) in simulated ears 2 on both sides. The left and right microphones 3 are
disposed inside the left and right simulated external ear canals 2b.
[0024]
(Description of the sound wave generator 11 for recording) The sound wave generator 11 for
sound recording gives the sound (information regarding direction) ultrasonically modulated
using a parametric speaker to the dummy head 1; A recording ultrasonic speaker 6 that
generates a sound source unit 13 for recording that can output "a plurality of sound signals
(information about direction)", and "a specific sound signal" is output from the sound source unit
13 for recording Recording signal output means 14, Recording ultrasonic modulation unit 15 for
modulating the "voice signal" outputted from the recording sound source unit 13 to ultrasonic
frequency, Recording amplifier for driving the recording ultrasonic speaker 6 And 16 are
configured.
[0025]
The recording ultrasonic speaker 6 generates air vibration at a frequency (20 kHz or higher)
higher than the human audible range, and is not limited to, for example, a plurality of ultrasonic
waves that generate ultrasonic waves. It is configured using a generating element.
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The plurality of ultrasonic wave generating elements are collectively disposed on a support plate
or the like and mounted as a speaker array.
A specific example of the ultrasonic wave generation element is a small-sized piezoelectric
speaker suitable for generating ultrasonic waves, and a piezoelectric element (piezoelectric
element) that is expanded and contracted according to an applied voltage (charge and discharge),
and expansion and contraction of this piezoelectric element And a diaphragm that generates
compression waves in the air.
[0026]
The sound source unit 13 for recording is, for example, a personal computer equipped with a
memory or program capable of generating “a plurality of audio signals”, and as an example of
assistance for understanding, the sound source unit 13 for recording of this embodiment "Please
note the right front", "Please note the right", "Please note the right rear", "Please note the rear",
"Please note the left rear"・ ・ ・ “Please note on the left” ・ “Please note on the left front”,
It is provided to be able to output the voice signal (information on direction).
[0027]
The recording signal output unit 14 is, for example, a controller such as a keyboard, and can
output the “specific audio signal” from the recording sound source unit 13.
[0028]
The recording ultrasonic wave modulation unit 15 performs ultrasonic wave modulation on the
“voice signal” output from the sound recording unit 13.
As a specific example of the recording ultrasonic wave modulation unit 15, in this embodiment,
the output signal of the sound recording unit 13 for recording is "amplitude change (increase or
decrease change in voltage) at a predetermined ultrasonic frequency (for example, 25 kHz)"
Using AM modulation (amplitude modulation).
The ultrasonic modulation is not limited to the AM modulation, and other ultrasonic modulation
techniques such as PWM modulation (pulse width modulation) may be used.
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[0029]
The recording amplifier 16 is for driving the recording ultrasonic speaker 6 based on the
ultrasonic signal modulated by the recording ultrasonic modulator 15 (for example, a class B
amplifier or a class D amplifier). An ultrasonic wave modulated with an audio signal is generated
toward the dummy head 1.
[0030]
In addition, as the ultrasonic wave modulated to the “audio signal” emitted toward the dummy
head 1 propagates in the air, the ultrasonic wave having a short wavelength is distorted and
blunted by the viscosity of the air or the like.
Then, the amplitude component contained in the ultrasonic wave is self-demodulated in the air
on the way of propagation, and the “audio signal” is reproduced in the dummy head 1. That is,
ultrasonic modulated sound obtained by ultrasonically modulating the “voice signal” can be
applied from the recording ultrasonic speaker 6 to the dummy head 1.
[0031]
(Description of the Recording Device 12) The digital recording device for storing (recording) in
the memory 17 the "audio signal (sound used for recording)" of 2 channels captured by the left
and right microphones 3 of the dummy head 1 (For example, a personal computer), which stores
"audio signals" of two channels captured respectively by the left and right microphones 3 at
independent addresses of the memory 17.
[0032]
(Description of Recording Method) The recording ultrasonic speaker 6 is installed so as to
irradiate an ultrasonic wave toward the substantially central portion of the dummy head 1.
In addition, it is desirable that sound recording be performed in a place with little reverberation
such as a silent room. Further, the number of use of the recording ultrasonic speaker 6 may be
one or plural.
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[0033]
(A) In the recording of “please be careful ahead”, the front of the dummy head 1 is directed to
the recording ultrasonic speaker 6 to perform recording, and the recording is recorded in the
memory 17. As a result, a binaural recording that sounds from the front, "Please pay attention to
the front," is stored in the memory 17. (B) In the recording of “Please pay attention to the front
right”, the recording ultrasonic speaker 6 is disposed on the front right of the dummy head 1 to
perform recording, and the recording is recorded in the memory 17. As a result, a binaural
recording that sounds as "Please note the right front" is stored in the memory 17 from the right
front. (C) In the recording of “please be careful to the right”, the recording ultrasonic speaker
6 is disposed on the right side of the dummy head 1 to perform recording, and the recording is
recorded in the memory 17. As a result, a binaural recording that sounds from the right side
"Please note right" is stored in the memory 17. (D) In the recording of “Please pay attention to
the rear right”, the recording ultrasonic speaker 6 is disposed on the rear right of the dummy
head 1 to perform recording, and the recording is recorded in the memory 17. As a result, a
binaural recording that sounds from the right rear "Please note the right back" is stored in the
memory 17.
[0034]
(E) In the case of "Please be careful behind", the recording ultrasonic speaker 6 is disposed
behind the dummy head 1 to perform recording, and the recording is recorded in the memory
17. As a result, a binaural recording that sounds from the rear "Please note the back" is stored in
the memory 17. (F) In the case of "Please note the left rear", the recording ultrasonic speaker 6 is
disposed on the left rear of the dummy head 1 to perform recording, and the recording is
recorded in the memory 17. As a result, a binaural recording that sounds from the left rear
"Please note the left rear" is stored in the memory 17. (G) In the recording of “please be careful
on the left”, the recording ultrasonic speaker 6 is disposed on the left side of the dummy head 1
to perform recording, and the recording is recorded in the memory 17. As a result, a binaural
recording that sounds from the left "Please note the left" is stored in the memory 17. (H) In the
recording of “Please note the left front”, the recording ultrasonic speaker 6 is disposed on the
left front of the dummy head 1 to perform recording, and the recording is recorded in the
memory 17. As a result, a binaural recording that sounds as "please note the left front" is stored
in the memory 17 from the left front.
[0035]
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(Specific Description of Vehicle Voice Device) The alerting device of this embodiment includes: (i)
the eight “voice signals (recorded using the dummy head 1) stored in the memory 17 by the
above recording method (Ii) a two-channel reproduction means 5 for reproducing the binaural
recording stored in the reproduction sound source unit 4 (ii) ) Attention monitoring means 22 for
outputting a “specific audio signal” from the reproduction sound source unit 4
[0036]
The caution monitoring means 22 is a monitor means (such as an ultrasonic wave sonar or an
image analysis means using a CCD camera, etc.) for monitoring the condition around the vehicle,
and a warning is generated in which direction of the vehicle Note direction determination means
for determining whether or not the playback direction signal causes the reproduction sound
source unit 4 to output “a specific audio signal (two channel audio signal by binaural
recording)” based on the determination result of the caution direction determination means
Providing instruction means;
The attention monitoring means 22 shown in this embodiment is for explaining the embodiment
used for understanding aid, and can be variously changed.
[0037]
Specifically, the reproduction signal instruction means (a) two channel audio signals of "Please be
careful ahead" from the reproduction sound source unit 4 when the caution direction
determination means determines that a caution item has occurred forward. (Binaural recording)
is output, and (b) the audio signal from the playback sound source unit 4 “Please be careful to
the front right” of the two channels of the audio signal when it is determined that the warning
direction judgment means has generated a warning in front of the right (Binaural recording) is
output, and (c) the audio signal for playback on the 2nd channel of “Please be careful to the
right” from the playback sound source unit 4 when the warning direction judgment means
judges that a warning has occurred on the right (B) 2 channel audio signals of “Please be careful
to the rear right” from the sound source unit 4 for playback when the caution direction
determination means determines that a warning has occurred on the rear right Binola (E) When
the caution direction judgment means judges that a warning has occurred at the back, the audio
signal for the two channels of “Please be careful behind” from the playback sound source unit
4 (binaural recording (Binaural recording) (F) Two channels of audio signals (Binaural recording)
from the sound source unit 4 for playback when the caution direction determination means
determines that a warning has occurred on the left rear. (G) Two-channel audio signal (Binaural
recording) from the sound source unit 4 for playback when the caution direction judgment
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means judges that a warning has occurred on the left side. And (h) two channels of audio signals
(Binaural recording) from the sound source unit 4 for playback "Please be careful in the left
front" when the warning direction judgment means judges that a warning has occurred on the
left front The It is output.
[0038]
(Description of Two-Channel Reproduction Means 5) The two-channel reproduction means 5
provides two-channel audio (binaural recording: information regarding direction) to the driver
using a two-channel parametric speaker, and the left and right ears of the driver To the left and
right for reproduction ultrasound speakers 7 that generate ultrasonic waves respectively; 2
channels for reproduction ultrasound for modulating “audio signals” of 2 channels output
from the reproduction sound source unit 4 to ultrasonic frequency A modulation unit 23, and a
two-channel reproduction amplifier 24 for driving the right and left reproduction ultrasonic
speakers 7 (a plurality of ultrasonic wave generation elements) are configured.
[0039]
The left and right reproduction ultrasonic speakers 7 generate air vibration at a frequency (20
kHz or higher) higher than the human audible range, and may have the same basic configuration
as the recording ultrasonic speaker 6. And may be different types of ultrasonic speakers (for
example, ribbon speakers).
[0040]
The right and left reproduction ultrasonic speakers 7 emit ultrasonic waves toward the left and
right ears of the driver. As a specific installation example, in FIG. An example of installation in
The installation places of the left and right reproduction ultrasonic speakers 7 are not limited to
the vehicle seat 25 and other such as the side of the meter panel (dashboard etc.), pillars on both
sides of the windshield, the ceiling of the vehicle, etc. You may install in the place.
[0041]
Also, as shown in FIG. 2 (a), the left and right reproduction ultrasonic speakers 7 are not in
parallel arrangement of the irradiation axes of the respective ultrasonic waves, but are shown in
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FIG. 2 (b). The irradiation axis is arranged inward (inward arrangement).
Specifically, the irradiation axes of the ultrasonic waves of the left and right reproduction
ultrasonic speakers 7 intersect at the driver side, and the intersection of the irradiation axes may
be in front of the driver or in the head of the driver You may also be behind the driver.
[0042]
The two-channel reproduction ultrasonic modulation unit 23 performs ultrasonic modulation on
the two-channel “audio signals” output from the reproduction sound source unit 4, and as a
specific example of the reproduction ultrasonic modulation unit 23. In this embodiment, AM
modulation is used to modulate the output signal of the reproduction sound source unit 4 into a
predetermined "amplitude change at an ultrasonic frequency (for example, 25 kHz etc.)".
The ultrasonic modulation is not limited to the AM modulation, and other ultrasonic modulation
techniques such as PWM modulation may be used.
[0043]
The two-channel reproduction amplifier 24 independently drives the left and right reproduction
ultrasonic speakers 7 based on the ultrasonic signals modulated by the two-channel reproduction
ultrasonic modulation unit 23 (for example, a class B amplifier or A class D amplifier or the like)
generates ultrasonic waves obtained by modulating “audio signals” from the right and left
reproduction ultrasonic speakers 7 toward the left and right ears of the driver.
[0044]
In addition, the ultrasonic wave which modulated the "voice signal" emitted to the left and right
ears of the driver, as it propagates in the air, the ultrasonic wave having a short wavelength is
distorted and blunted by the viscosity of air, etc. Ru.
Then, the amplitude component contained in the ultrasonic wave is self-demodulated in the air
on the way of propagation, and "voice" is reproduced at the left and right ears of the driver.
Alternatively, the ultrasonic wave that has reached the head α of the driver before demodulation
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is self-demodulated at the head α (near the ear, etc.) of the driver to reproduce “voice” at the
left and right ears of the driver.
[0045]
The specific operation is shown below. (A) When the warning direction judgment means judges
that a warning has occurred in the front, and the audio source unit 4 for playback outputs a
"Please note the front" audio signal, "Please note the front" voice Is localized in front of the
driver. (B) When the warning direction judgment means judges that a warning has occurred on
the right front, and the sound source unit 4 for playback outputs a "Please be careful on the front
right" voice signal, "Please be careful on the front right The sound of 'is localized at the right
front of the driver. (C) When the warning direction judgment means judges that a warning has
occurred on the right side, and the sound source unit 4 for playback outputs a "Please be careful
to the right" audio signal, "Please be careful on the right" The sound is localized on the right side
of the driver. (D) When the warning direction judgment means judges that a warning has
occurred in the rear right, and the sound source unit 4 for playback outputs a voice signal saying
"Please note the rear right", "Please be careful on the rear right 'S sound is localized at the right
rear of the driver.
[0046]
(E) When the warning direction judgment means judges that a warning has occurred in the rear,
and the sound source unit 4 for playback outputs a sound signal of "Please be careful behind", a
sound of "please be careful behind" Is localized behind the driver. (F) When the warning direction
judgment means judges that a warning has occurred on the left rear, and the sound source unit 4
for playback outputs "Please note the left rear", "Please be careful on the left rear 'S voice is
localized at the left rear of the driver. (G) When the warning direction judgment means judges
that a warning has occurred on the left side, and the sound source unit 4 for playback outputs a
"Please be careful on the left" audio signal, "Please be careful on the left" The sound is localized
on the left side of the driver. (H) When the warning direction judgment means judges that a
warning has occurred on the left front, and the audio signal for "Please be careful on the left
front" is output from the playback sound source unit 4, "Please be careful on the left front 'S
voice is localized in front of the driver's left.
[0047]
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(Effect 1 of the embodiment) As described above, the binaural recording (recording material)
stored by the reproduction sound source unit 4 is an ultrasonic speaker for recording ultrasonic
modulation sound obtained by ultrasonic modulation of sound (sound information regarding
direction) as described above. 6 to the dummy head 1 for recording. Since the directionality of
the ultrasonic wave is strong, the spread of the sound is suppressed, and the "head used for
recording" can be given to the dummy head 1 at the pinpoint. That is, highly accurate “3D
information of sound (localization information)” can be given to the microphone 3 of the right
ear and the microphone 3 of the left ear of the dummy head 1. As a result, compared to the
existing binaural recordings, it is possible to obtain a binaural recording (recording material)
whose localization in the direction of sound generation is dramatically higher, and even in a car
room where sound reflection and booming noise are likely to occur. , Accurate "stereo
localization of sound" becomes possible.
[0048]
(Effect 2 of the Embodiment) As described above, the two-channel reproducing means 5
ultrasonically modulates the binaural recording stored in the sound source unit 4 for
reproduction again at the two-channel reproducing means 5 and carries out the ultrasonic wave
modulation. The modulated sound is given to the left and right ears of the driver from the left
and right reproducing ultrasonic speakers 7 installed at a position away from the driver's head
α. Since the ultrasonic waves are highly directional, the spread of the sound can be suppressed
and pinpoints can be accurately given "recorded sounds" to the left and right ears. That is, even
in a vehicle interior in which sound reflection and booming noise are likely to occur, “the 3D
information of sound” can be “accurately reproduced” in each of the right and left ears of the
driver.
[0049]
Thus, even if "the position of the speaker (specifically, the position of the ultrasonic transducer 7
for reproduction on the left and right)" and the "ear" on the left and right of the driver are
separated, "3D information of sound included in binaural recording Can be accurately
reproduced with the left and right "ears" of the driver. As a result, the sound generation direction
can be localized freely at any position without using headphones in a vehicle interior where
reflections of sounds and booming sounds are likely to occur. That is, even if the "speaker
position" and the "ear" are separated from each other in the vehicle interior in which the sound
reflection and the booming sound easily occur, the "stereo localization of sound" can be
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accurately reproduced.
[0050]
(Effect 3 of the Embodiment) As described above, the dummy head 1 used for binaural recording
is provided with the artificial pinna 2a and the artificial external ear canal 2b, and the left and
right microphones 3 are disposed inside the left and right artificial external ear canal 2b. As a
result, the "sounds used for recording" are recorded by the left and right microphones 3 while
including the influence of the pinna and the ear canal. Specifically, in the case of the common
dummy head 1 not having the artificial pinna 2a and the artificial ear canal 2b, as shown by the
broken line A in FIG. There is a problem that "3D information of sound" can not be obtained.
[0051]
On the other hand, since the dummy head 1 of this embodiment is provided with the simulated
auricle 2a and the simulated external ear canal 2b, as shown by the solid line B in FIG. 3, the
frequency characteristics are affected by the external ear (earl + external ear canal). Can record
accurate "sound 3D information". Thus, by providing the dummy auricle 2a and the artificial
external ear canal 2b in the dummy head 1, the accuracy of the "3D information of sound"
included in the binaural recording can be enhanced, and as a result, the "sound of sound" is given
to the driver. The accuracy of stereo localization can be improved.
[0052]
(Effect 4 of the Embodiment) As described above, the left and right reproduction ultrasonic
speakers 7 are disposed inward. As a result, the ultrasonic modulation sound emitted from the
left and right reproduction ultrasonic speakers 7 reaches the tympanic membrane while the
influence of the driver's ear canal is suppressed, and the accuracy of the "3D information of
sound" given to the "tympanic membrane" It can be enhanced. Specifically, when the left and
right reproduction ultrasonic speakers 7 are arranged in parallel, the traveling direction of the
ultrasonic waves is orthogonal to the external ear canal, so a low frequency region such as 2 kHz
or less is in the tympanic membrane as shown by the broken line C in FIG. There is a problem
that it does not reach and the correct "3D information of sound" can not be obtained.
11-04-2019
17
[0053]
On the other hand, in this embodiment, since the left and right reproduction ultrasonic speakers
7 are internally disposed, a part of the ultrasonic waves intrude into the inside of the ear canal,
and as shown by the solid line D in FIG. In the low frequency region of the to, the reach to the
tympanic membrane is increased, and the driver can be provided with accurate "sound 3D
information". Therefore, even if the left and right reproduction ultrasonic speakers 7 are
separated from the driver's head α, it can be close to the use state of the headphones that emit
sound toward the eardrum, and in the stereophonic sound device not using the headphones The
accuracy of the stereo localization of sound can be improved.
[0054]
(Effect 5 of the Embodiment) The present invention can be mounted on a vehicle because
accurate “stereoscopic localization of sound” is possible without using headphones.
Furthermore, in this embodiment, by providing the "information on direction" to the driver, it is
possible to quickly recognize the direction to be provided, and it is possible to shorten the "time
of recognition of direction". Therefore, the driver's alerting ability can be enhanced. Specifically,
depending on the localization direction of the sound, it is possible to warn the driver of the
dangerous place accurately, thereby preventing the driver from being misunderstood, and as a
result, the safety can be enhanced.
[0055]
Second Embodiment A second embodiment will be described with reference to FIG. In each of the
following embodiments, the same reference numerals as in the above embodiment denote the
same functions. In the above-mentioned first embodiment, (i) “direction of warning occurrence
(for example, right front)” determined by the warning direction determination unit, and (ii)
localization direction of sound to be recognized by the driver (for example, right front) (Iii)
Furthermore, an example is shown in which the announcement content (for example, right front)
regarding “information on direction” in the audio signal matches. That is, the example in which
the “determination direction”, the “localization direction”, and the “announce direction”
completely coincide with each other has been shown.
[0056]
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The present invention is not limited to the case in which the "determination direction", the
"localization direction" and the "announce direction" completely coincide, and in order to make
the user's understanding and judgment quicker, "the determination direction". You may change
part of "localization direction" and "announce direction".
[0057]
A specific example will be described with reference to FIG.
(I) As shown in FIG. 5A, when the attention direction determination means determines the
pedestrian Y approaching toward the own vehicle X to the “right front” of the own vehicle X
adopting the present embodiment, (Ii) As shown in virtual sound source T (location of sound
recognized by the user by the two-channel reproducing means 5) in FIG. 5 (b), the sound is
localized at the “right front” of the driver; It may be made to announce "The person comes
from the right (not right front)" by the signal.
[0058]
In this manner, the user can easily understand and make judgment by simply announcing the
warning information generated in the “right front” as “right”, and the driver's alerting
ability can be enhanced.
[0059]
Third Embodiment A third embodiment will be described with reference to FIG.
In the above-described first and second embodiments, an example in which “localization of one
sound” is given to the user is shown. That is, an example has been shown in which virtual sound
sources T having different directions are given one by one to the user. In the present invention,
the number of virtual sound sources T to be recognized by the user is not limited to one, and a
plurality of virtual sound sources T having different directions may be simultaneously given to
the user.
[0060]
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19
A specific example will be described with reference to FIG. When the driver's vehicle X starts a
preparatory action to change lanes, for example, the driver blinks the turn signal while the
driver's vehicle X is traveling: (i) As shown in FIG. A parallel running vehicle Z1 running parallel
to the "right side" of the own vehicle X equipped with the vehicle voice device (alert alert device)
of this embodiment, and-the vehicle voice device (alert alert device) of this embodiment When it
is determined that the parallel running vehicle Z2 runs parallel to the "left adjacent" of the own
vehicle X mounted, (ii) virtual sound sources T1 and T2 (sounds recognized by the user by the
two-channel reproducing means 5 in FIG. As shown in), localize the sound to each of the "right
and left sides" of the driver, and (iii) according to the sound signals from virtual sound sources
T1 and T2, "cars are on both sides (an example of information on direction)" Make an
announcement.
[0061]
In this way, it is generated at the same time by announcing "information about multiple
directions (cars on both sides, etc.)" by "localizing sound in multiple directions" and "multi-alert
information generated simultaneously" The user can quickly understand and judge multiple
pieces of attention information, and the driver's alerting ability can be enhanced. Specifically, in
this embodiment, it is possible to know the traveling condition around the own vehicle X by the
auditory information, and it is possible to avoid danger and to change the course safely.
[0062]
Fourth Embodiment A fourth embodiment will be described with reference to FIG. In the binaural
recording stored by the reproduction sound source unit 4 in the first embodiment, the ultrasonic
modulation sound (ultrasound in which the audible sound is modulated to the ultrasonic
frequency) generated from the sound recording ultrasonic speaker 6 is directly transmitted to
the dummy head 1 It is a recorded material that was irradiated and recorded. On the other hand,
in the binaural recording stored by the reproduction sound source unit 4 according to the fourth
embodiment, the ultrasonic modulation sound generated from the recording ultrasonic speaker 6
is applied to the reflection target object, and the reflection reflected by the reflection target
object Includes recordings of recorded sounds.
[0063]
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20
(Description of Binaural Recording of Reflected Sound) An example of a specific reflected sound
recording technique will be described with reference to FIG. In this embodiment, an example of
using a pseudo parallel running vehicle Z (a reflecting object regarded as a parallel running
vehicle) is shown as an example of a reflection object, but this is a specific example for
understanding assistance and is limited. It is not a thing. In this fourth embodiment, the following
binaural recording is performed independently of the binaural recording shown in the first
embodiment.
[0064]
The sound source unit 13 for recording is provided so as to be capable of generating a reference
sound (for example, a vehicle road noise or the like) for reflected sound recording separately
from “a plurality of audio signals (announce)”. The positional relationship between the dummy
head 1, the recording ultrasonic speaker 6, and the pseudo parallel running vehicle Z (reflection
target object) is such that the reflected sound reflected by the pseudo parallel running vehicle Z
is directed to the approximate center of the dummy head 1. Is placed to
[0065]
(A) In recording where the virtual sound source (the reflected sound of the pseudo parallel
running vehicle Z) is localized in the "right side" of the driver, the dummy head 1, the recording
ultrasonic speaker 6, and the pseudo parallel running vehicle Z The binaural recording is
performed with the positional relationship with () being in a state where the reflected sound
reflected by the pseudo parallel running vehicle Z is reflected toward the right surface of the
dummy head 1. (B) In recording where the virtual sound source (the reflected sound of the
pseudo parallel running vehicle Z) is localized at the “right rear” of the driver, the dummy
head 1, the recording ultrasonic speaker 6 and the pseudo parallel running vehicle Z (reflection
target The binaural recording is performed with the positional relationship with the above in a
state where the reflected sound reflected by the pseudo parallel running vehicle Z is reflected
toward the right rear surface of the dummy head 1.
[0066]
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21
(C) In recording where the virtual sound source (the reflected sound of the pseudo parallel
running vehicle Z) is localized on the left side of the driver, the dummy head 1, the recording
ultrasonic speaker 6, and the pseudo parallel running vehicle Z The binaural sound recording is
performed with the positional relationship with) being in a state where the reflected sound
reflected by the pseudo parallel running vehicle Z is reflected toward the left surface of the
dummy head 1. (D) In the recording where the virtual sound source (the reflected sound of the
pseudo parallel running vehicle Z) is localized at the driver's “left rear”, the dummy head 1, the
recording ultrasonic speaker 6, and the pseudo parallel running vehicle Z The binaural recording
is carried out with the positional relationship with () being in a state where the reflected sound
reflected by the pseudo parallel running vehicle Z is reflected toward the left rear surface of the
dummy head 1.
[0067]
(Description of Binaural Recording of Voice Announcement Regarding Direction) Further, in the
fourth embodiment, (a ′) sound image is localized on the right according to the recording
method of the voice announcement described in the first embodiment. Binaural recording, (b ')
Binaural recording of "There is a car behind the right" sound localization in the rear right, (c')
Binaural recording of "There is a car on the left position" in the left, b ') Perform binaural
recording of "There is a car behind the left" and sound localization in the rear left.
[0068]
(Description of Reproducing Technology of Reflected Sound) The basic configuration of the
alerting device of this fourth embodiment is the same as that of the first embodiment (symbols
and reference to the first embodiment), and the sound source unit 4 for reproduction and the
two-channel reproducing means 5 Prepare.
The sound source unit 4 for reproduction according to the fourth embodiment performs (a ')
binaural recording of "There is a car on the right" for sound localization in the right, and (b')
sound localization in the right rear. Binaural recording of "There is a car behind the right" and (b
') Binaural recording of "There is a car on the left" with sound image localization on the left, (b') A
car with sound image localization on the left rear There is a binaural recording of "There is a", (a)
A binaural recording of "the reflected sound of the pseudo parallel running vehicle Z" which
localizes the sound image on the right side, (b) (B) Binaural recording of "the reflected sound of
the pseudo parallel vehicle Z" with sound image localization on the left, and (d) of the "Reflected
sound of the pseudo parallel vehicle Z" with sound image localization on the left rear It stores
binaural recordings and.
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[0069]
The two-channel reproduction means 5 of this fourth embodiment makes "Binaural recording of
voice announcement about direction" and "Binaural recording of reflected sound" stored in the
reproduction sound source unit 4 simultaneously or one by one continuously (or alternately). The
ultrasonically modulated sound is ultrasonically modulated, and the ultrasonically modulated
sound is provided so as to be directed from the left and right reproducing ultrasonic speakers 7
to the left and right ears of the driver.
[0070]
Next, a specific reproduction example (action) of the reflected sound by the alerting device will
be described.
Although an example in which “voice announcement (binaural recording) regarding direction”
and “reflected sound (binaural recording)” are simultaneously reproduced is shown below, the
present invention is not limited thereto, and each of them is reproduced separately. Also good.
[0071]
(A) When the driver X starts a preparation action to change lanes to the right such as the driver
blinks the right blinker while the host vehicle X (symbol, see FIG. 6) is traveling, When the
warning direction judgment means judges the pseudo parallel running vehicle Z to the right side
of the vehicle, from the reproduction sound source unit 4, the binaural recording of “There is a
car to the right” localized on the right side It mixes with the binaural recording of "the reflected
sound by parallel running vehicle Z", and makes it output simultaneously. Then, the binaural
recording is reproduced from the left and right reproduction ultrasonic speakers 7 by the
parametric speaker, and "the car is at the right" and "the reflected sound by the pseudo parallel
running vehicle Z" is localized at the right of the driver.
[0072]
(B) When the driver's vehicle X starts a preparatory action to change lanes to the right such as
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the driver blinks the right blinker while the vehicle X is traveling, the caution direction
determination means of the caution monitoring means 22 is the vehicle Judging the parallel
running vehicle Z in the right rear, from the sound source unit 4 for reproduction, binaural
recording of “There is a car behind the right” localized in the right rear, and “reflection sound
by the simulated parallel running vehicle Z localized in the right rear "Binaural recording" is
mixed and output simultaneously. Then, the binaural recording is reproduced from the right and
left reproduction ultrasonic speakers 7 by the parametric speaker, and "the car is behind the
right" and "the reflected sound by the pseudo parallel running vehicle Z" is localized at the right
rear of the driver.
[0073]
(C) When the driver's vehicle X starts a preparatory action to change the lane to the left, such as
the driver blinks the left turn indicator while the vehicle X is traveling, the caution direction
determination means of the caution monitoring means 22 Judging parallel running vehicle Z on
the left side, binaural recording of “There is a car on the left” localized from the sound source
unit 4 for reproduction from the sound source unit 4 for reproduction and “Sound reflected
from the running parallel vehicle Z localized on the left "Binaural recording" is mixed and output
simultaneously. Then, the binaural recording is reproduced from the left and right reproduction
ultrasonic speakers 7 by the parametric speaker, and "the car is at the left" and "the reflected
sound by the pseudo parallel running vehicle Z" is localized at the left of the driver.
[0074]
(D) When the driver's vehicle X starts a preparatory action to change the lane to the left, such as
the driver blinks the left turn indicator while the vehicle X is traveling, the caution direction
determination means of the caution monitoring means 22 Judging parallel running vehicle Z in
the left rear, binaural recording of “There is a car behind the left” localized from the sound
source unit 4 for reproduction from the sound source unit 4 for reproduction "Binaural
recording" is mixed and output simultaneously. Then, the binaural recording is reproduced from
the left and right reproduction ultrasonic speakers 7 by the parametric speaker, and "the car
behind the left" and "the reflected sound by the pseudo parallel running vehicle Z" are localized
at the left rear of the driver.
[0075]
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(Effects of Fourth Embodiment) As described above, the alerting device of the fourth embodiment
reproduces the binaural recording of the reflected sound reflected by the reflection target
(pseudo parallel running vehicle Z or the like) and gives it to the driver. The reflected sound
includes the auditory information of “information of the reflection object (for example, the
pseudo parallel running vehicle Z)”. For this reason, by reproducing the reflected sound by the
alerting device, it is possible to give the driver "information of a reflection object (for example,
the pseudo parallel running vehicle Z)" by the auditory information together with the "direction
information of sound". That is, the auditory information enables the user to quickly understand
and judge the reflective object, and as a result, the driver's alerting ability can be enhanced.
[0076]
Here, it is known that the visually impaired person obtains information of a reflective object
similar to visual information from a reflected sound that a hitting sound from a stick or the like
bounces from the surroundings. Normal subjects do not usually obtain information of a reflective
object similar to visual information from the reflected sound because normal subjects have
priority in visual information. However, even healthy people have the same hearing ability as
visually impaired people. For this reason, it is possible to obtain information of a reflective object
similar to visual information from "a reflected sound reflected by a reflective object" using the
alerting device. Alternatively, the user (driver or the like) repeatedly hears "the reflected sound
reflected by the reflective object" using the alerting device, and it is possible to obtain
information of the reflective object similar to visual information from the reflected sound.
become.
[0077]
Thus, the reflection object may be different from the pseudo parallel running vehicle Z, and even
if it is different from the pseudo parallel traveling vehicle Z, the reflection sound of the reflection
target is reproduced by the alerting device to reproduce the reflection sound. Auditory
information by sound enables the user to quickly understand the reflective object.
[0078]
A plurality of the above embodiments may be combined.
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As a specific example, when the third embodiment and the fourth embodiment are combined and
parallel running vehicles Z1 and Z2 are present on the left and right sides of the own vehicle X,
"the reflected sound by the pseudo parallel running vehicle Z" is a virtual sound source T1, You
may localize by T2.
[0079]
Although the above embodiment shows an example in which the present invention is applied to a
warning device for a vehicle, the present invention is not limited to this, and is applied to a
navigation system to provide "information on direction" to an occupant. It is good.
[0080]
Although the above embodiment shows an example in which voice information is given to a
passenger, the present invention is not limited to this, and the present invention may be applied
to a vehicle audio or the like in which music or the like is given to a passenger.
[0081]
In the above embodiment, although an example in which the three-dimensional sound system is
mounted on a vehicle is shown, it is not limited, and the sound system in a narrow space (a space
where sound reflection or booming noise is likely to occur) other than the cabin. The present
invention may be applied to a device that generates sounds such as voice and music.
[0082]
DESCRIPTION OF SYMBOLS 1 dummy head 2 artificial ear 2a artificial auricle 2b artificial
external ear canal 3 microphone 4 sound source unit for reproduction 5 2 channel reproduction
means 6 ultrasonic speaker for recording 7 ultrasonic speaker for reproduction Z artificial
parallel running vehicle (reflection object) α driver Head (user's head)
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