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DESCRIPTION JP2014110566

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DESCRIPTION JP2014110566
Abstract: To provide "sound information useful for driving" by stereophonic sound to "driver
only" without using headphones. [Solution] “Sound information useful for driving” is given to
the left and right ears of a driver β sitting on a driver's seat α by “parametric speaker +
binaural reproduction”. When the driver β sits on the driver's seat α, the left and right ear
positions of the driver β (irradiation positions of ultrasonic waves) can be specified.
Furthermore, by installing the right speaker R1 and the left speaker L1 for ultrasonic wave
generation above the driver β, "the reproduced sound reproduced at the ear of the driver β" is
"direct sound or reflection to the person in the front passenger seat or the rear seat" It is possible
to prevent the problem that it sounds as a sound, and it is possible to increase the sound
pressure difference of the reproduced sound with respect to the surrounding people. As a result,
it is possible to give “sound information useful for driving” by stereophonic sound to “driver
β only” without using headphones. [Selected figure] Figure 1
3D sound system
[0001]
The present invention relates to a three-dimensional sound apparatus for giving threedimensional sound to "only a specific person" without wearing headphones, for example, a
technology for providing sound information and the like to a driver who drives a car Suitable for
use in
[0002]
11-04-2019
1
A "normal stereo device" is known as a three-dimensional sound device for providing threedimensional sound to people.
The “ordinary stereo device” generally used is a technology that generates sound of an audio
frequency from dynamic speakers installed at places distant from each other to generate
stereophonic sound to a person separated from the dynamic speakers from left and right.
However, in the “ordinary stereo device”, stereophonic sound is given to “next person”, and
stereophonic sound can not be given pointwise to “only a specific person”.
[0003]
Head fins are known as means for avoiding this problem. However, headphones are difficult to
hear other sounds and are bothersome to wear, and some people dislike wearing feeling, and a
technique that does not use headphones is desired. In addition, drivers who drive cars are
prohibited to wear headphones, and can not be applied to drivers.
[0004]
The background art will be described using a driver as an example for the purpose of assisting
understanding. For drivers "sound information useful for driving (winder operation sound,
alerting sound notifying the presence of a pedestrian in the direction of travel of the vehicle,
alerting sound notifying the presence of a destination vehicle at the time of lane change, vehicle
lane protruding It is desirable to give a warning sound to inform the user of the possibility of
[0005]
"Sound information useful for driving" is useful for drivers, but is often unnecessary for other
occupants and passengers. For this reason, the driver loses the "sound information useful for
driving" if the "sound information useful for driving" is erased by a request other than the driver.
[0006]
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2
The specific example is demonstrated. When the driver operates the winker, he or she
consciously prevents the forgetting of the winker and forgetting to erase the blinker by hearing
the blinker operation noise (the click sound of the clicker, the click sound of the tick and the
clicker).
[0007]
However, for passengers other than the driver, the blinker operation noise may sometimes be
bothersome, and there is a demand to make the blinker activation noise inaudible to the sleeping
passengers, for example, while traveling on a late-night bus. Although it is possible to eliminate
the blinker operation noise by taking measures such as mounting the blinker relay away from the
driver's seat, the driver does not have a sense of security that prevents the blinker from
forgetting to turn out or forgets to turn off the blinker. The burden of will increase.
[0008]
Therefore, a technique for giving "sound information useful for driving" only to the driver is
desired. In particular, "sound information useful for driving" includes "winker operation sound",
"alert awakening sound to notify the presence of a pedestrian in the traveling direction of the
vehicle", and "alert notification to notify the presence of a destination vehicle when changing
lanes" There are many cases where there is a distinction between the left and right directions
such as "sound", "alert awakening sound to notify the possibility of vehicle lane extension", and
"car navigation guidance sound". Therefore, a technique for giving "sound information useful for
driving" using three-dimensional sound only to the driver is desired.
[0009]
Japanese Patent Application Laid-Open No. 5-153687
[0010]
The present invention has been made in view of the above problems, and an object thereof is to
provide a three-dimensional sound apparatus capable of providing three-dimensional sound to
"only a specific person (driver or the like)" without wearing headphones. It is in.
[0011]
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3
The three-dimensional sound apparatus of the present invention specifies "a specific person (a
target person who gives a three-dimensional sound)" to "a person sitting in a seat".
When a person sits in the seat, the left and right ear positions (head position and direction) can
be identified.
As a result, it is possible to accurately reproduce the reproduced sound at the left and right ears
of the "person sitting in the seat" by the left and right parametric speakers. In addition, the right
and left speakers are located above the person sitting in the seat. For this reason, it can be
suppressed that "the reproduction sound reproduced at the ear of the person sitting in the seat
(the reproduction sound with high straightness by the parametric speaker)" reaches the person in
the vicinity directly or by reflection. Stereo sound can be given only to the person sitting in the
seat. As described above, the three-dimensional sound device of the present invention accurately
reproduces the reproduction sound at the ear of the person sitting in the seat, and the
reproduction sound does not reach the people in the vicinity, so the user can sit in the seat
without wearing headphones. Stereophonic sound can be given to people (specific people only).
[0012]
(A) Explanatory drawing of speaker arrangement | positioning seen from seat back, (b) It is
explanatory drawing of sound image localization (virtual sound source) which a person
recognizes by binaural reproduction | regeneration (Example 1). It is a block diagram of a threedimensional sound apparatus (Example 1). It is explanatory drawing of "the arrangement |
positioning elevation angle of a speaker" (Example 1). It is a graph which shows the difference of
the "audience sound pressure of noise" with respect to "the arrangement | positioning elevation
angle of a speaker" (Example 1). It is a graph which shows the difference of "the hearing sense
sound pressure of 7.7 kHz" with respect to "the arrangement | positioning elevation angle of a
speaker" (Example 1). It is explanatory drawing which shows the difference of the attainment
sound pressure in monaural time and stereo time (when a speaker is arrange | positioned
separately) (Example 1). It is a graph which shows the relationship between the "driver
attainment sound pressure and the assistant driver's seat attainment sound pressure" with
respect to the "interval between the left and right speakers" (Example 1). It is a graph which
shows the difference of "driver attainment sound pressure and front passenger seat attainment
sound pressure" in monaural time and stereo time (when the speaker is arrange | positioned
separately) (Example 2). It is a graph which shows the difference of the audibility sound pressure
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4
in monaural time and stereo time (when a speaker is arrange | positioned separately) (Example
2).
[0013]
Hereinafter, modes for carrying out the invention will be described in detail based on the
drawings.
[0014]
It is needless to say that the following examples show specific examples, and the present
invention is not limited to the examples.
[0015]
Example 1 Example 1 will be described with reference to FIGS. 1 to 7.
This embodiment is an application of the present invention to a driving support device.
The driving support apparatus of this embodiment provides a driver β (an example of a person
sitting in a seat) sitting on a driver's seat α of a car with "sound information useful for driving (a
blinker operating sound as a specific example)". And mounts a stereophonic sound device that
causes the driver β to three-dimensionally localize the sound image.
[0016]
Specifically, the three-dimensional sound device of this embodiment listens to the "Winker
operation sound" in the "driver β only", (i) when flashing the right blinker, "the blinker operation
sound to the right of the driver β It is made to "localize in the direction" and (ii) "localize the
blinker operation sound in the left direction of the driver β" when blinking the left blinker.
[0017]
The winker relay is provided so that the relay activation noise (winker activation noise) can not
be directly heard by the occupant (driver β or other occupants).
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5
Specifically, the winker relay is mounted at a position away from the vehicle interior, or the
winker relay is covered with a sound insulating material or the like so that the relay operation
sound can not be heard directly by the occupant. Or, the vehicle does not have the winker relay.
[0018]
The specific configuration of the three-dimensional sound apparatus will be described with
reference to FIG. The stereophonic sound device includes: a reproduction sound source unit 1
equipped with a memory for storing binker-recorded 2-channel "winker operation sound signal
(sound source)"; and an audio for the right channel generated by the reproduction sound source
unit 1 The signal (winker operation sound signal) is subjected to ultrasonic modulation and
irradiated with ultrasonic waves toward the right ear of the driver β, and the reproduced sound
(winker operation sound for the right channel) is generated directly to the right ear of the driver
β Parametric speaker 2 for the right ear, and · Ultrasonic modulation of the audio signal for the
left channel (winker operation sound signal) generated by the sound source unit 1 for
reproduction and irradiating the ultrasonic wave toward the left ear of the driver β and a
parametric speaker 3 for the left ear that generates reproduced sound (winker operation sound
for the left channel) directly to the left ear of β.
[0019]
The sound source unit 1 for reproduction generates (i) "Winker operation sound signal for right
localization (a binaural signal in which a sound image is localized in the right direction of the
driver β)" when the right winker operates, (ii) left When the winker operates, "a winker
operation sound signal for left localization (a binaural signal in which a sound image is localized
in the left direction of the driver β)" is generated.
[0020]
Binaural recording is a two-channel recording technology that records using right and left
microphones placed in the left and right simulated ears of a dummy head that imitates the head
of a person, and generally provides stereophonic sound to the headphone wearer Is known as a
recording technology for
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6
The binaural recording in this embodiment is a recording (not limited) of the reproduction sound
(the blinker operation sound) given to the dummy head by the parametric speaker.
[0021]
The parametric speaker 2 for the right ear: The right speaker R1 that generates an ultrasonic
wave toward the right ear of the driver β; The audio signal for the right channel generated by
the sound source unit 1 for reproduction (winker operation sound signal) Right ultrasonic
modulation unit R2 that modulates to the sound wave frequency; right power amplifier R3 that
drives the right speaker R1 by the modulation signal modulated by the right ultrasonic
modulation unit R2 (for example, class B amplifier or class D amplifier Etc.) and.
[0022]
Similarly, the left-ear parametric speaker 3 generates the ultrasonic wave toward the left ear of
the driver β, the left speaker L 1, and the audio signal for the left channel generated by the
reproduction sound source unit 1 (winker operation sound signal ) For the ultrasonic frequency,
and the left power amplifier L3 (for example, a class B amplifier or a class D amplifier for driving
the left speaker L1 with the modulation signal modulated by the left ultrasonic modulation
section L2). Etc.) and.
[0023]
The right speaker R1 and the left speaker L1 are ultrasonic wave generation means for
generating an ultrasonic wave in the parametric speaker, convert an electric signal (amplifier
drive signal) into air vibration, and have a frequency (20 kHz or higher) higher than the human
audible band Generate air vibration).
Although the specific ultrasonic wave generating means used for the right speaker R1 and the
left speaker L1 is not limited, as a specific example, in this embodiment, a plurality of
piezoelectric elements capable of generating ultrasonic waves are gathered in an array. It is
arranged.
[0024]
The right speaker R1 emits an ultrasonic wave toward the right ear of the driver β seated in the
driver's seat α, and the left speaker L1 emits an ultrasonic wave toward the left ear of the driver
β seated in the driver's seat α The right speaker R1 and the left speaker L1 are disposed above
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7
the head position of the driver β who is seated in the driver's seat α.
[0025]
Specifically, as shown in FIG. 1 (a), (i) the right speaker R1 is directed to the right ear position of
the driver β and directed to the ceiling of the vehicle with the direction of ultrasonic wave
irradiation (central axis of ultrasonic wave irradiation) (Ii) The left speaker L1 is installed on the
ceiling of the vehicle with the direction of ultrasonic wave irradiation (the central axis of
ultrasonic wave irradiation) directed to the left ear position of the driver β.
The distance H from the right speaker R1 and the left speaker L1 to the ear position of the driver
β is not limited, and changes depending on the ceiling position of the vehicle or the like.
[0026]
Further, each of the right speaker R1 and the left speaker L1 is provided so as to be able to
adjust the ultrasonic wave irradiation direction (not limited).
As a result, it becomes possible to always correctly direct the irradiation direction of the
ultrasonic wave to the left and right ear positions of the driver β, depending on the height
position of the head and the front and back position of the seat α.
[0027]
The operation of the parametric speaker will be described. When the right winker is activated,
ultrasonic waves modulated by "sound signal for winker operation sound signal for right
localization (binaural signal for right localization)" are emitted from the right speaker R1 and the
left speaker L1 toward the left and right ears of the driver β. Be done. Similarly, when the left
winker is activated, an ultrasonic wave obtained by ultrasonically modulating "a left winker
operation sound signal for left localization (binaural signal for left localization)" is transmitted
from the right speaker R1 and the left speaker L1 to the left and right ears of the driver β. It is
directed and emitted.
11-04-2019
8
[0028]
The ultrasonic waves modulated from the “winker operation sound signal” emitted from the
right speaker R1 and the left speaker L1 toward the left and right ears of the driver β are
ultrasonic waves having a short wavelength due to the viscosity of air and the like as they
propagate through the air. Is distorted and blunted. Then, the amplitude component contained in
the ultrasonic wave is self-demodulated in the air on the way of propagation, and the “winker
operation noise” is reproduced at the left and right ears of the driver β. Alternatively,
ultrasonic waves that have reached the head of the driver β before demodulation selfdemodulate in the head of the driver β (in the vicinity of the ear, etc.), thereby reproducing
“winker operation noise” in the left and right ears of the driver β.
[0029]
As described above, by causing the reproduced sound to be directly generated at the left and
right ears of the driver β, it is possible to give the reproduced sound similar to that of the
headphones to the driver β. The reproduced sound reproduced directly at the left and right ears
of the driver β is a reproduced sound of binaural recording as described above. For this reason,
although the headphones are not attached, three-dimensional sound can be given to the driver β
as in binaural reproduction (reproduction of binaural recording) by the headphones. That is, even
if headphones are not attached, the sound image can be three-dimensionally localized at a
position γ away from the driver β by “parametric speaker + binaural reproduction”, for
example, as shown in FIG.
[0030]
Specifically, (i) when the winker lever is operated to the right, it is possible to localize the blinker
operation sound to the right of the driver β by "parametric speaker + binaural reproduction" (ii)
to turn the blinker lever to the left When operated, it is possible to localize the blinker operation
sound on the left side of the driver β by “parametric speaker + binaural reproduction”.
[0031]
(Effect 1 of the Embodiment) As described above, the “parametric speaker + binaural
reproduction” of the stereophonic sound device can give “sound information useful for
11-04-2019
9
driving” by stereophonic sound to “driver β only”.
As a result, for the passengers other than the driver β, the “sound information useful for
driving” does not feel bothersome. For example, while traveling on a late-night bus, the "sound
information useful for driving" can be made inaudible to passengers, and only the driver β can
hear "sound information useful for driving".
[0032]
(Effect 2 of the Embodiment) The three-dimensional sound apparatus of this embodiment
provides three-dimensional sound to the driver β who is seated at the driver's seat α. When the
driver β sits on the driver's seat α, the left and right ear positions (head position and direction)
of the driver β can be specified almost accurately. Therefore, it becomes possible to generate
reproduction sound by "parametric speaker + binaural reproduction" at the left and right ears of
the driver β, and to give "sound information useful for driving" by stereo sound to "driver β
only". it can.
[0033]
(Effect 3 of the Embodiment) In the stereophonic sound device of this embodiment, the right
speaker R1 and the left speaker L1 are disposed above the driver β. Specifically, in this
embodiment, the right speaker R1 and the left speaker L1 are disposed above the horizontal line
of the assumed ear position (designed ear position) of the driver β sitting on the driver's seat α
by 60 ° or more. As described above, by installing the right speaker R1 and the left speaker L1
for generating ultrasonic waves in the parametric speaker above the driver β, “the reproduced
sound reproduced at the ear of the driver β (a reproduced sound with strong straightness by the
parametric speaker Can prevent the problem that the person in the front passenger seat or the
rear seat can hear as a direct sound (a passing sound passing the driver β) or a reflected sound
(a sound reflected by the driver β or the like).
[0034]
(Effect 4 of the Embodiment) In the three-dimensional sound apparatus of this embodiment, as
described above, the right speaker R1 and the left speaker L1 are disposed above the driver β.
11-04-2019
10
Here, it is known that the human ear has different audible frequencies depending on the
direction of sound generation, depending on the structure of the auricle (so-called "Mi-mi-bu").
Specifically, when the human ear generates a sound from the upper side, a high sound of 5 kHz
or more can be heard with good sensitivity and a low sound sensitivity of 5 kHz or less is heard
as compared with the case of generating a sound from the front. It is known to go down.
[0035]
Therefore, in this embodiment, by setting the frequency of the reproduced sound to be
reproduced at the ear of the driver β to 5 kHz or more, it is made easy for the driver β to
recognize “sound information useful for driving”. As a specific example, in this embodiment,
the driver β recognizes the blinker operating noise by setting the blinker operating noise to 7
kHz to 8 kHz (for example, 7.7 kHz) and giving the driver β from above. It is easy to do.
[0036]
This example will be specifically described with reference to FIGS. 3 and 4. Unlike the present
invention, as shown in FIG. 3, with the right speaker R1 and the left speaker L1 installed at the
front position (elevation angle θ = 0 °) of the driver β, the “Winker operating noise” of 7.7
kHz is used as the driver β. The sound pressure heard by the driver β becomes the broken line
A1 in FIG.
[0037]
On the other hand, as shown in FIG. 3, the right speaker R1 and the left speaker L1 are installed
right above the driver β (elevation angle θ = 90 °), and the 7.7 kHz “winker operation
sound” The sound pressure heard by the driver β becomes the solid line A2 in FIG. As apparent
from comparison between the broken line A1 (reference example) and the solid line A2
(example), the driver is disposed by disposing the right speaker R1 and the left speaker L1
directly above the driver β (elevation angle θ = 90 °). The sound pressure of 7.7 kHz that
sounds like β can be increased, and the driver β can easily recognize the “winker operation
sound”.
[0038]
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11
(Effect 5 of the Embodiment) The noise of the right speaker R1 and the left speaker L1 in which a
plurality of piezoelectric elements are gathered in an array includes many 1 kHz to 3 kHz. Here,
as described above, when the human ear generates a sound from above, the sensitivity of a low
sound of 5 kHz or less is lowered as compared with the case where the sound is generated from
the front. Therefore, by arranging the right speaker R1 and the left speaker L1 above the driver
β, the “noise” heard by the driver β can be reduced.
[0039]
This example will be specifically described with reference to FIGS. 3 and 5. Unlike the present
invention, as shown in FIG. 3, when the right speaker R1 and the left speaker L1 are placed at the
front position (elevation angle θ = 0 °) of the driver β and the sound pressure level of noise is
measured, the driver β The sound pressure that can be heard becomes the broken line B1 in FIG.
[0040]
On the other hand, as shown in FIG. 3, when the right speaker R1 and the left speaker L1 are
placed directly above the driver β (elevation angle θ = 90 °) and the sound pressure level of
noise is measured, the driver β can be heard The sound pressure is indicated by a solid line B2
in FIG. As apparent from comparison between the broken line B1 (reference example) and the
solid line B2 (example), the driver is disposed by arranging the right speaker R1 and the left
speaker L1 directly above the driver β (elevation angle θ = 90 °). The sound pressure level of
noise heard in β can be reduced.
[0041]
(Effect 6 of the Embodiment) In this embodiment, as shown in FIG. 6, the ultrasonic wave
irradiation direction (the central axis of ultrasonic wave irradiation) of the right speaker R1 is
directed to the right ear position R of the driver β. Similarly, the ultrasonic wave irradiation
direction of the left speaker L1 (the central axis of ultrasonic wave irradiation) is directed to the
left ear position L of the driver β. Therefore, even if the head position of the driver β changes
slightly back and forth or to the left and right, it is possible to suppress the change in sound
11-04-2019
12
pressure of the reproduced sound heard by the driver β.
[0042]
This will be described specifically. In the case of generating "monaural reproduced sound" at the
center position C of the head of the driver β by the parametric speaker technology although the
ultrasonic speaker is disposed above the driver β, according to the present invention, (i) It is
necessary to increase the maximum sound pressure generated at the center position C in
consideration of the reach distance of the sound, and (ii) when the head position changes back
and forth, as shown by the broken line C ′ in FIG. The change in sound pressure heard by the
driver β becomes large.
[0043]
On the other hand, in this embodiment adopting the present invention, (i) Since the reproduced
sound is generated at the right ear position R and the left ear position L, the maximum sound
pressure is made smaller than in the case of monaural. (Ii) Even if the head position changes back
and forth, the sound pressure change heard by the driver β can be reduced as shown by the
broken line R 'and the broken line L' in FIG. As a result, even if the head position of the driver β
is slightly changed, it is possible to make the driver β recognize the reproduced sound of the
stereophonic sound device, and it is possible to prevent erroneous recognition of “sound
information useful for driving”. .
[0044]
(Effect 7 of the Embodiment) In this embodiment, the arrangement interval W between the right
speaker R1 and the left speaker L1 is set to 15 cm or more (preferably 20 cm or more) and 45
cm or less. Specifically, in this embodiment, the arrangement interval W between the right
speaker R1 and the left speaker L1 is equal to or larger than the “expected head width of the
driver β (designed head width: for example, average adult width)” of the driver β. And the
driver's β “shoulder shoulder width (design shoulder width: for example, average adult
shoulder width)” or less.
[0045]
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13
Explain the reason. If the arrangement interval W between the right speaker R1 and the left
speaker L1 is set narrower than "20 cm which is the assumed width of the head of the driver β",
the arrangement of the right speaker R1 and the left speaker L1 is an external swing (the
irradiation axis of ultrasonic waves is It becomes outward from parallel). Then, the ultrasonic
waves emitted from the right speaker R1 and the left speaker L1 diffuse, and the sound pressure
of the reproduced sound reaching the passenger at the front passenger seat increases.
[0046]
Conversely, when the arrangement interval W between the right speaker R1 and the left speaker
L1 is set wider than “the assumed shoulder width 45 cm of the driver β”, the internal swing
of the arrangement of the right speaker R1 and the left speaker L1 (the irradiation axis of
ultrasonic waves The degree of inward is greater than parallel. Then, the sound pressure of the
reproduced sound reaching the passenger at the passenger seat increases due to the reflected
sound reflected by the driver β and reaching the passenger at the passenger seat and the
reflected sound reflected at the door or the like because the cabin is narrow. is there.
[0047]
Therefore, as described above, the arrangement interval W between the right speaker R1 and the
left speaker L1 is set to “20 cm or more of the assumed width of the head of the driver β” and
less than “45 cm of the assumed shoulder width of the driver β”. The sound pressure
difference between “played sound heard by driver β” and “played sound heard by passenger
on the passenger seat” can be largely secured, and “sound information useful for driving” by
stereophonic sound is given to “driver β only”. be able to.
[0048]
A specific example of this will be described with reference to FIG.
The solid line X in FIG. 7 shows the sound pressure of the reproduced sound heard by the driver
β, and the solid line Y in FIG. 7 shows the sound pressure of the reproduced sound heard by the
passenger of the passenger seat. As the arrangement interval W between the right speaker R1
and the left speaker L1 increases, the reproduced sound easily reaches the inside of the outer
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ear, and the sound pressure of the reproduced sound increases. As a result, as indicated by the
solid line X in FIG. 7, as the arrangement interval W between the right speaker R1 and the left
speaker L1 increases, the sound pressure of the reproduced sound heard by the driver β
increases.
[0049]
On the other hand, as the arrangement interval W between the right speaker R1 and the left
speaker L1 approaches 0 cm from the "expected head width (20 cm) of the driver β", the degree
of "outside swing" mentioned above becomes large. As a result, as indicated by the solid line Y in
FIG. 7, the reproduction sound is diffused as the arrangement distance W between the right
speaker R1 and the left speaker L1 approaches 0 cm from the “expected head width of 20 cm”
of the driver β. The sound pressure of the playback sound heard by the passenger on the
passenger seat increases.
[0050]
On the other hand, as the arrangement interval W between the right speaker R1 and the left
speaker L1 expands from the "expected head width (20 cm) of the driver β", the degree of the
above-mentioned "inner swing" becomes larger. As a result, as indicated by the solid line Y in FIG.
7, the reproduced sound reflected by the driver β as the arrangement interval W between the
right speaker R1 and the left speaker L1 becomes wider than “the assumed width of the head
(20 cm) of the driver β”. As a result, the sound pressure of the reproduced sound heard by the
passenger on the passenger seat increases.
[0051]
Here, the data of FIG. 7 will be captured and described. The experimental result of FIG. 7 is not
data in the passenger compartment but data measured in a wide space. For this reason, in FIG. 7,
the reflected sound by the vehicle member such as the door is not included in the data. However,
in reality, in a narrow vehicle interior, it is affected by vehicle members such as doors. For this
reason, although not reflected in the experimental result (solid line Y) in FIG. 7, when the
arrangement interval W between the right speaker R1 and the left speaker L1 exceeds the
"expected shoulder width (45 cm)" of the driver β, The degree of "outside swing" increases, and
the reproduced sound reflected by the door or the like increases. As a result, when the
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arrangement interval W between the right speaker R1 and the left speaker L1 is wider than the
"expected shoulder width" of the driver β, the sound pressure difference (20 dB) between the
driver β and the passenger in the passenger seat can not be secured.
[0052]
Therefore, the arrangement interval W between the right speaker R1 and the left speaker L1 is
set in the range of "width of assumed head (20 cm)" to "expected shoulder width (45 cm)" of the
driver β. As a result, the sound pressure difference between the driver β and the passenger on
the front passenger seat can be secured, and “sound information useful for driving” by
stereophonic sound can be given to “driver β only”.
[0053]
(Effect 8 of the Embodiment) The binaural recording used in this embodiment is recorded using
the reproduction sound by the parametric speaker. Since the ultrasonic wave used for the
parametric speaker has strong directivity, the spread of the sound can be suppressed to give the
dummy head a "sound used for recording". As a result, highly accurate "3D information of sound
(localization information)" can be given to the dummy head that performs binaural recording. As
a result, compared to existing binaural recordings (binaural recordings that do not use
parametric speaker technology), binaural recordings (sound recordings) with high sound image
localization can be obtained, and the localization is superior to the driver β. "3D sound" can be
given.
[0054]
Second Embodiment A second embodiment will be described with reference to FIGS. 8 and 9. In
the following embodiments, the same reference numerals as in the first embodiment indicate the
same functions. (Characteristic Technology 1 of Second Embodiment) In the first embodiment
described above, an example is given in which the driver β is provided with “sound information
(such as blinker operation sound and warning sound) useful for driving” at high frequency (7
kHz to 8 kHz). However, the frequency range of reproduced sound is not limited, and for
example, reproduced sound including bass may be given to the driver β. As a specific example,
in the second embodiment, the present invention is combined with "sound equipment such as
music and radio", and "sound waves such as music and radio" can be provided only to the driver
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β.
[0055]
According to the present invention, it is possible to give "sounds such as music and radio" by
stereo sound to "only driver β". As a result, for the crew other than the driver β, the “music,
radio, etc.” heard by the driver β does not feel bothersome. For example, while traveling at
midnight, only the driver β can listen to “music, radio, etc.” without hesitation to other
occupants.
[0056]
As an example of giving “sound waves such as music and radio” only to the driver β, a
specific example capable of securing a sound pressure difference (for example, 20 dB or more)
between the driver β and other occupants will be described with reference to FIG. Unlike the
present invention, when the reproduction sound is generated from the front to the driver β by
the parametric speaker technology, the reproduction sound is heard by the occupant of the rear
seat or the like. Specifically, as shown in FIG. 8A, the sound pressure difference between the
sound pressure level heard by the driver β (solid line D1) and the sound pressure level heard by
the rear seat occupant (broken line D2) is sufficiently large. Can not do it.
[0057]
On the other hand, in the second embodiment, since the right speaker R1 and the left speaker L1
are disposed above the driver β, as described in the above “effect 3 of the embodiment”,
“reproduced at the ear of the driver β” “Playback sound (playback sound with strong
rectilinearity by parametric speakers)” can be heard as “direct sound (passing sound passing
driver β)” or reflected sound (sound reflected by driver β etc.) to people in the front passenger
seat and rear seat It is possible to prevent "problems". Specifically, as shown in FIG. 8B, the sound
pressure difference between the sound pressure level heard by the driver β (solid line D1 ′)
and the sound pressure level heard by the rear seat occupant (broken line D2 ′) is sufficient It
can be secured large.
[0058]
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17
(Characteristic Technology 2 of Embodiment 2) As described above, this embodiment 2 provides
not only high frequencies but also sound waves (sound waves such as music and radio) including
bass to the driver β. Here, the right speaker R1 and the left speaker L1 are spaced apart by 20
cm or more (the width of the driver's head or more) as described in the first embodiment. Thus,
the sound pressure of the bass given to the driver β can be increased by reproducing the
reproduced sound including the bass at the left and right ears of the driver β.
[0059]
This bass enhancement effect will be described with reference to FIG. Although the ultrasonic
speaker is disposed above the driver β, unlike the present invention, when the monaural
reproduced sound is generated at the center position C of the head of the driver β by the
parametric speaker technology, the ultrasonic irradiation of the ultrasonic speaker The crossing
angle between the axis and the left and right ear canal of the driver β becomes sharp (less than
90 °). As a result, as shown by the broken line E1 in FIG. 9, there is a problem that the bass
heard by the driver β is lowered.
[0060]
On the other hand, in this embodiment, since the right speaker R1 and the left speaker L1 are
spaced apart by 20 cm or more (more than the width of the driver head), (i) the ultrasonic wave
irradiation axis of the right speaker R1 and the driver β As the crossing angle with the right ear
canal is 90 ° or more, (ii) the crossing angle between the ultrasonic wave irradiation axis of the
left speaker L1 and the left ear canal of the driver β is also 90 ° or more. Thus, as shown in the
solid line E2 in FIG. 9, the crossing angle between the ultrasonic wave irradiation axis of the right
speaker R1 and the left speaker L1 and the left and right ear canals of the driver β is closer to a
straight line than in the monaural case. , The sound heard to the driver β increases. That is, the
bass sound heard by the driver β can be enhanced without increasing the number of
piezoelectric speakers.
[0061]
In the above-described embodiment, the “winker operation sound” is shown as an example of
the “sound information useful for driving” given to the driver β, but the present invention is
not limited thereto. Various sound information (for pedestrians in the traveling direction of the
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18
vehicle A warning sound indicating the existence, a warning sound notifying the existence of the
vehicle to be changed at the time of lane change, a warning sound indicating the possibility of the
vehicle lane being projected, a guidance sound of car navigation, etc. may be given.
[0062]
Although the driver β is shown as an example of the “specific person” in the above
embodiment, it is not limited, and it may be a passenger of a passenger seat or a rear seat, or a
person sitting in a seat different from a car. The present invention may be applied to techniques
for providing stereophonic sound.
[0063]
2 Parametric Speaker for Right Ear 3 Parametric Speaker for Left Ear α Driver's Seat (Specified
Seat) β Driver (Specific Person) R1 Right Speaker L1 Left Speaker
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