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DESCRIPTION JP2011130359

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DESCRIPTION JP2011130359
The present invention provides a vehicle-specific personal audio system capable of providing
audible sounds (such as voice and music) to "only a specific passenger (for example, only a
driver)". SOLUTION: From a head ultrasonic speaker 1 installed above the driver, ultrasonic
waves whose amplitude is modulated according to an audio signal are emitted only to the head
α of the driver. Then, the amplitude component contained in the ultrasonic wave is not in air but
is demodulated in the driver's head α (such as the skull), and the driver's head α (such as the
skull) is vibrated by the amplitude component contained in the ultrasonic wave. , Only the driver
can hear the "audible sound" by the "audio signal that became the sound source". As a result, only
the driver can obtain navigation voice and voice information of traffic information, or only the
driver can enjoy music and radio without causing inconvenience to other crew members.
[Selected figure] Figure 1
Personal audio equipment for vehicles
[0001]
The present invention relates to a vehicle-specific personal audio system that provides an
"audible sound" such as "voice" or "music" to only a specific occupant (one or more) of the
occupants who board the vehicle. A) a device for giving an audible sound only to a specific
occupant (one or more), or (ii) a device for giving an audible sound to only a specific occupant
(one or more) selected arbitrarily (Iii) A device (including a device for giving a separate audible
sound to each passenger) which gives a separate audible sound to the occupants of a plurality of
groups (including one person) may be used.
[0002]
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BACKGROUND ART Automobiles are equipped with devices for generating various audible
sounds (voice, music, etc.) such as radio receivers, reproduction devices for music and movies,
navigation systems and the like.
Furthermore, in the future, development and widespread use of a system for giving information
for assisting driving as an audible sound (voice, alarm sound, etc.) to a driver etc. has been
observed.
[0003]
However, the cabin of a car is not acoustically wide. For this reason, even in a situation where
only a specific occupant of the plurality of occupants requires an audible sound (voice, music,
etc.), the audible sound requested by the specific occupant can be heard by other occupants.
[0004]
An example of this will be specifically described. For example, while driving a car, if you want to
hear specific voice information (for example, navigation voice, traffic information, etc.) so that
only the driver does not bother the quietness or conversation of the other crew members. Even if
there is a demand like this, when the other driver sleeps and only the awake driver wants to
listen to music, radio etc., the prior art makes audible sound (voice, music) given to the driver.
However, other crew members can not hear the above requirement.
[0005]
Or • If you want to appreciate "music, etc." so that "crew members of a group (including one)"
among multiple crew members do not disturb the quietness or conversation of other crew
members. Even if there is such a requirement, in the prior art, the audible sound (such as music)
given to the “members of a certain group” can be heard by the other occupants, and the
above-mentioned requirements can not be satisfied.
[0006]
Or ・ There is a demand that “crew of one group (including one)” among multiple crew
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members want to appreciate “music etc.” and “crew of another group (including one)” is
“other” Even if there is such a demand, it is necessary to listen to the audible sound (such as
music) given to the “crew of a certain group” to other crews even if there is such a demand. An
audible sound (such as another music or a movie) given to the "other group of crew members" is
also heard by the other crew members, and the above requirement can not be satisfied.
[0007]
As a technology to suppress the above problems, (i) Aside from the "in-room speaker" that plays
music, etc., an "auxiliary speaker" is installed near the driver, and the reverse of the music
emitted from the "in-room speaker" There is known a technology that makes it easier for the
driver to recognize the "navi voice" by canceling out the "music" reaching the driver by releasing
the phase component from the "auxiliary speaker" by canceling it in reverse phase (for example,
(See Patent Document 1)) (ii) A speaker is embedded in the headrest (pillows) of the seat on
which the occupant sits, and music reproduction is performed near the occupant's ear to prevent
other occupants from hearing the music. It is known (for example, refer patent document 2).
[0008]
However, in the technique of (i) above, it is realistic to cancel out "only music in the driver's
space" in the opposite phase by the "auxiliary speaker" because the driver exists in the "common
space" with other occupants. It is impossible.
Further, even in the technique of (ii) above, since the audible sound of the audio frequency is
directly emitted from the speaker, the audible sound emitted from the speaker of the headrest in
the narrow vehicle compartment The sound volume) reaches other occupants with a relatively
loud sound (sound pressure level that is easy to recognize).
As described above, in the prior art in which the audible sound is directly reproduced from the
speaker, even if various measures are taken, it may be possible to hear the audible sound (voice,
music, etc.) to "only a specific occupant" of a plurality of occupants. could not.
[0009]
[Patent Document 1] Japanese Patent Application Publication No. 2007-0198980 Japanese
Patent Application Publication No. 2001-095646
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[0010]
The present invention has been made in view of the above-mentioned problems, and an object
thereof is to provide a personal audio system for a vehicle which can hear an audible sound (such
as voice and music) to "only a specific passenger". .
[0011]
[Means of Claim 1] A personal audio apparatus for a vehicle adopting the means of Claim 1 is an
ultrasonic wave directed only to the head of a "specific occupant" of a plurality of occupants
using a so-called parametric speaker. Generate
The amplitude component (energy of amplitude by compression wave) contained in the
ultrasonic wave emitted to the head of the “specific occupant” from the ultrasonic speaker for
the head is self-defined by the head (such as the skull) of the “specific occupant”. The head of
the occupant (such as the skull) is demodulated and vibrated with a sound wave component
according to the "audio signal (sound signal: audio analog signal) serving as a sound source".
[0012]
In this way, when the head (such as the skull) of the "specific occupant" vibrates with the sound
wave component according to the "audio signal that is the sound source", only the "specific
occupant" becomes the "audio that becomes the sound source You can hear the "audible sound"
from the signal.
That is, the vehicle personal audio system adopting the means of claim 1 can be used in a
plurality of units without being heard by the other occupants (or, even if it is heard by the other
occupants, the volume of the other occupants can be extremely small). The audible sound (voice,
music, etc.) can be heard to "only a specific crew member" among the crew members.
[0013]
According to the second aspect of the present invention, there is provided an ultrasonic speaker
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for a head according to the second aspect, which is for a driver who emits ultrasonic waves
toward the head of a driver who sits in a driver's seat.
For this reason, audible sound (voice, music, etc.) can be heard to "only the driver" among a
plurality of crew members. That is, by adopting claim 2, only the driver can obtain voice
information such as navigation voice and traffic information, or only the driver can enjoy music
and radio without disturbing other occupants.
[0014]
According to the third aspect of the present invention, the vehicle personal acoustic apparatus of
the third aspect is provided with a plurality of independent head ultrasonic speakers directed
toward the heads of a plurality of occupants, and a plurality of head ultrasonic waves are
provided. An ultrasonic amplitude modulator and a speaker driving unit are provided
corresponding to each of the ultrasonic speakers for ultrasonic wave. Thus, depending on the
installation state of the plurality of head ultrasound speakers and the selection state of the drive,
for example, (i) only the driver and the passenger on the front passenger seat, (ii) the other
occupants except the driver, and (iii) the driver Audible sounds (voice, music, etc.) can be heard
only by a plurality of occupants who have head ultrasonic speakers installed, as in the case of
other occupants except the passenger seat occupant.
[0015]
[Means of Claim 4] A personal audio apparatus for a vehicle adopting the means of Claim 4
includes distribution selection means for selecting the distribution state of "audio signal as a
sound source". As a result, it is possible to drive only "a certain group (including one machine) of
head ultrasound speakers" selected by the distribution select means among the plurality of head
ultrasound speakers. That is, the audible sound (voice, music, etc.) can be heard only by the crew
of a certain group (including one) selected by the distribution select means among the plurality
of crews.
[0016]
Note that a plurality of audio signal input units may be provided, and the plurality of "audio
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signals to be sound sources" may be distributed to "a plurality of groups (including one person)"
by the distribution selecting means. By providing in this way, it is possible to hear different
audible sounds (voice, music, etc.) for the occupants of a plurality of groups (including one).
[0017]
[Means of Claim 5] The personal acoustic apparatus for a vehicle adopting the means of Claim 5
is installed on the back surface of the back of the seat instead of the above-mentioned ultrasonic
speaker for the head, An ultrasonic speaker for backrest is used which irradiates ultrasonic
waves to an occupant sitting at the rear of the car. The amplitude component contained in the
ultrasonic wave emitted from the ultrasonic speaker for the back to the occupant sitting at the
back of the seat on which the ultrasonic speaker for the back is installed is self-demodulated by
the occupant's body, Is vibrated with a sound wave component according to the "audio signal as
a sound source".
[0018]
Specifically, (i) If the ultrasonic wave emitted from the ultrasonic speaker for the spine is directed
to the "head of the occupant", the amplitude component contained in the ultrasonic wave is selfdemodulated by the head of the occupant, and the head of the occupant is " It vibrates with the
sound wave component according to the audio signal that has become the sound source, and (ii)
when the ultrasonic wave emitted from the ultrasonic speaker for spine is directed to the “body
of the occupant,” the amplitude component contained in the ultrasonic wave is the occupant
The torso of the occupant self-demodulates, and the occupant's torso vibrates with a sound wave
component according to the "audio signal that has become a sound source".
[0019]
As described above, by using the back ultrasound ultrasonic speaker, an audible sound (voice,
music, etc.) can be heard only to the occupant sitting behind the seat on which the back
ultrasound ultrasonic speaker is installed.
In addition, by providing the ultrasound speaker for spine for hanging behind the spine of the
seat, versatility is enhanced and the number of occupants who individually hear audible sounds
(voice, music, etc.) can be facilitated. It is possible to increase or decrease the
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[0020]
According to the sixth aspect of the present invention, there is provided a personal audio
apparatus for a vehicle adopting the means of the sixth aspect, which is directly mounted on the
head of a person instead of the above-described ultrasonic speaker for the head and which emits
ultrasonic waves on the head. The head mounted ultrasonic speaker is used to The amplitude
component contained in the ultrasonic wave emitted from the head-mounted ultrasonic speaker
toward the head is self-demodulated by the head, and the head or auditory organ is made to
correspond to the "audio signal that is the sound source" Vibrate with sound wave component.
[0021]
As described above, by using the head-mounted ultrasonic speaker, an audible sound (voice,
music, etc.) can be heard only by a person who has the head-mounted ultrasonic speaker. In
addition, since the head-mounted ultrasonic speaker sounds the human skull and auditory organs
directly at an audible frequency, it does not block the passenger's ear like earphones and
headphones, and other sounds are simultaneously heard. I can hear it. For this reason, it is
excellent in safety for vehicles.
[0022]
It is explanatory drawing of the personal audio system for vehicles (Example 1). BRIEF
DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the personal audio system
for vehicles (Example 1). It is principle explanatory drawing of a parametric speaker. It is a graph
which shows the data value in the relation between frequency and sound pressure level. It is
explanatory drawing of the personal acoustic apparatus for vehicles (Example 2). It is a block
diagram of the personal audio system for vehicles (Example 2). It is a front view of the ultrasonic
transducer for backrests hung behind the back of a sheet | seat (Example 3). It is a developed
view of glasses showing an example of wearing of an ultrasonic speaker for head attachment
(example 4).
[0023]
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The basic configuration of a vehicle personal audio system will be described with reference to the
drawings. The vehicle personal audio apparatus comprises a head ultrasonic speaker 1, an audio
signal input unit 2, an ultrasonic amplitude modulator 3, and a speaker drive unit 4. When the
head-use ultrasonic speaker 1 receives the “electric signal (voltage signal or current signal)
oscillating (increase or decrease) at the ultrasonic frequency”, “the compression wave of air
according to the given oscillation frequency (ie, The transducer for electricity and vibration that
generates “ultrasonic waves” is provided so as to irradiate ultrasonic waves only to the head α
of a specific occupant.
[0024]
The audio signal input unit 2 is a portion (signal connection unit such as a connector) that
receives the supply of the “audio signal as a sound source” from an external device or the like.
[0025]
The ultrasonic amplitude modulator 3 is a voltage that oscillates at an ultrasonic frequency, the
increase or decrease change of the audio signal supplied to the audio signal input unit 2
(specifically, the increase or decrease change of voltage or current in the audio signal with
respect to time axis Or it modulates to the amplitude change of the current.
The "amplitude change" in the "voltage or current" may be as follows: (i) As shown in FIG. 3, the
"width of magnitude of voltage or current" may be changed; (ii) PWM modulation As in the
above, the "width of generation time of voltage or current" may be changed.
[0026]
The speaker drive unit 4 drives the head ultrasonic speaker 1 with the ultrasonic signal (electric
signal) whose amplitude is modulated by the ultrasonic amplitude modulator 3. Thereby,
ultrasonic waves are emitted from the head ultrasonic speaker 1 toward the head α of the
“specific occupant”. The amplitude component included in the ultrasonic wave emitted from
the head ultrasonic speaker 1 to the head α of the “specific occupant” is self-demodulated by
the head α (such as the skull) of the “specific occupant”, and the ultrasonic wave is generated.
The head part α of the occupant vibrates due to the amplitude component contained in. As a
result, only "specific occupants" can hear "audible sounds".
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[0027]
Next, a specific example of the vehicle personal audio system will be described with reference to
FIGS. 1 to 4. In the following examples, the same reference numerals as those in the abovementioned [Form for carrying out the invention] indicate the same functions. The first
embodiment shows an example in which an audible sound such as voice or music is heard only to
the driver among a plurality of occupants as a specific example of the vehicle personal audio
system.
[0028]
[Configuration of Embodiment 1] As shown in FIG. 2, the vehicle personal acoustic device of this
embodiment 1 includes a head ultrasonic speaker 1 capable of emitting an ultrasonic wave, and
an ultrasonic speaker 1 for the head. And a main unit 5 that performs operation control.
[0029]
As shown in FIG. 1, the head ultrasonic speaker 1 is installed on a ceiling above the head of a
driver (an example of an occupant sitting at a specific riding position) in the driver's seat A and
directed to the driver's head α. It is provided to emit ultrasonic waves.
Specifically, the head ultrasonic speaker 1 is provided so as to irradiate ultrasonic waves only to
the inside of the range indicated by the broken line β in FIG. The head ultrasonic speaker 1 may
be simply detachable from the ceiling, or may be firmly attached to the ceiling in consideration of
design like a manufacturer option. Also good.
[0030]
In addition, although it is desirable that the irradiation direction of the ultrasonic wave in the
head ultrasonic speaker 1 be arbitrarily adjustable within a predetermined range, the irradiation
direction of the ultrasonic wave may be fixed in advance. Furthermore, FIG. 1 shows an example
in which the head ultrasonic speaker 1 is disposed directly above (directly above) the driver's
head α, but the head super The sound wave speaker 1 may be provided so as to irradiate
ultrasonic waves from the head ultrasonic wave speaker 1 toward the head portion α of the
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driver at an oblique position. In that case, it is desirable that the direction in which the ultrasonic
waves emitted from the head ultrasonic speaker 1 travel is in the direction away from the other
occupants.
[0031]
A specific structural example of the head ultrasonic speaker 1 will be described. The head
ultrasonic speaker 1 is an ultrasonic generator that generates air vibration at a frequency (20
kHz or higher) higher than the human audible range. Here, ultrasonic waves are highly
directional. That is, ultrasonic waves have a high degree of straightness of propagation in the air.
For this reason, it becomes possible to irradiate ultrasonic waves only to the head α of the driver
depending on the mounting position and the installation direction of the head ultrasonic speaker
1.
[0032]
As shown in FIG. 2A, the ultrasonic transducer 1 for head according to this embodiment uses a
plurality of piezoelectric speakers 6 (ceramic speakers, piezoelectric speakers, etc.) suitable for
ultrasonic wave reproduction and is used as a speaker array It is. The piezoelectric speaker 6
used in this embodiment has a well-known structure including a piezoelectric element that
expands and contracts according to an applied voltage (charge and discharge) and a diaphragm
that vibrates air by the expansion and contraction of the piezoelectric element. belongs to.
[0033]
The head ultrasonic speaker 1 controls the energy amount of the generated ultrasonic waves and
controls the directivity range of the ultrasonic waves emitted from the piezoelectric speakers 6
by the number and arrangement of the piezoelectric speakers 6 used. . In this embodiment, the
diaphragms of the plurality of piezoelectric speakers 6 are arranged on the same plane (see FIG.
2). However, unlike the embodiment, the diaphragms of the plurality of piezoelectric speakers 6
are dome-shaped. To concentrate the ultrasonic waves emitted from each piezoelectric speaker 6
on the head α of the driver and efficiently supply the ultrasonic waves emitted from each
piezoelectric speaker 6 to the head α of the driver. good. Further, in this embodiment, an
example using the piezoelectric speaker 6 as an example of a speaker generating an ultrasonic
wave is shown, but this is an example and is not limited, and any other speaker capable of
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reproducing an ultrasonic wave can be used. A speaker of the form of may be used.
[0034]
Next, the main unit 5 for driving the head ultrasonic speaker 1 will be described. The vehicle
personal acoustic apparatus according to the first embodiment, which provides an audible sound
only to the driver, includes the power supply unit 7, the audio signal input unit 2, the ultrasonic
amplitude modulator 3, and the speaker drive in addition to the head ultrasonic speaker 1
described above. The main unit 5 on which the unit 4 is mounted is provided. In addition,
although the example in which the main body apparatus 5 is installed in the sheet | seat lower
part of the front passenger seat B is shown in FIG. 1, it is not limited.
[0035]
The power supply unit 7 is connected to an on-vehicle power supply such as an on-vehicle
battery via the power supply cable 8 to supply power necessary for operation to the audio signal
input unit 2, the ultrasonic amplitude modulator 3 and the speaker drive unit 4. It is a power
supply unit to be performed.
[0036]
The audio signal input unit 2 is a portion that receives the “audio signal as a sound source”
from the external device 9.
An example of the external device 9 may be in-vehicle equipment such as a "radio receiver"
mounted on a vehicle, a "music or movie player", a "navigation system", or a "portable" carried by
an occupant from outside the vehicle It may be an audio device.
[0037]
An example of the concrete audio signal input part 2 is shown. The audio signal input unit 2 is a
connector to which the audio output cable 10 of the external device 9 is connected. For example,
the audio signal input unit 2 may be an audio standard connector such as an RCA terminal or a
mini phone jack. It may be a set connector. Further, the audio signal input unit 2 is not limited to
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the detachable connector, and the audio output cable 10 of the external device 9 is directly
connected to the substrate or the like in the main unit 5 by soldering or the like without the
connector. It may be fixed.
[0038]
The ultrasonic amplitude modulator 3 includes an ultrasonic oscillator that can oscillate at an
ultrasonic frequency (ie, a frequency exceeding 20 kHz: an example is 25 kHz, etc.). The increase
and decrease of the voltage is modulated to the "amplitude change of the oscillation voltage" of
the ultrasonic frequency.
[0039]
This (modulating the audio signal to "amplitude change of oscillation voltage") will be described
with reference to FIG.
For example, it is assumed that the input audio signal is a voltage change shown in FIG. On the
other hand, it is assumed that the ultrasonic oscillator mounted on the ultrasonic amplitude
modulator 3 oscillates at the ultrasonic frequency shown in FIG. 3 (b).
[0040]
Then, as shown in FIG. 3 (c), the ultrasonic amplitude modulator 3 increases the amplitude of the
voltage due to the ultrasonic vibration as (i) the voltage of the audio signal increases, (ii) the
voltage of the audio signal Decreases as the amplitude of the voltage due to the ultrasonic
vibration decreases. In this way, the ultrasonic amplitude modulator 3 modulates the audio signal
to "amplitude change of oscillation voltage" of the ultrasonic frequency.
[0041]
The speaker driving unit 4 is electrically connected to the piezoelectric speakers 6 of the head
ultrasonic speaker 1 via the speaker cable 11 and based on “the ultrasonic signal (electric
signal) obtained by amplitude-modulating the audio signal”. The piezoelectric speakers 6 in the
head ultrasonic speaker 1 are simultaneously driven, and by controlling the applied voltage
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(charge / discharge state) of each piezoelectric speaker 6, the “audio signal is amplitude
modulated from each piezoelectric speaker 6. It generates ultrasonic waves. As a specific
example, the speaker drive unit 4 is a power amplifier (or a charge / discharge device for a piezo
element), and the waveform signal shown in FIG. 3C from the ultrasonic amplitude modulator 3
to the speaker drive unit 4 The speaker driver 4 applies the waveform voltage shown in FIG. 3 (c)
to the head ultrasonic speaker 1, and generates ultrasonic waves of the output waveform shown
in FIG. 3 (c) from each piezoelectric speaker 6 It is
[0042]
The control of the volume of the ultrasonic wave generated by the head ultrasonic speaker 1 (the
volume of the audible sound given to the driver) is “volume setting means (volume etc. of
external device 9) connected to the audio signal input unit 2 It is made by That is, the increase
and decrease of the volume of the head ultrasonic speaker 1 is mainly performed by the volume
of the external device 9 or the like. The speaker drive unit 4 may be provided with a volume
(amplitude gain adjusting means), and the speaker drive unit 4 may adjust the volume.
[0043]
[Operation of Embodiment 1] The operation of the vehicle personal acoustic device of
Embodiment 1 will be described. Before describing the operation of the first embodiment, the
"basic operation of the parametric speaker" will be described. The parametric speaker emits
ultrasonic waves (sound waves that can not be heard) whose amplitude is modulated in
accordance with the audio signal, as shown in FIG. 3 (c). Then, as shown in FIG. 3D, as the
ultrasonic wave propagates in the air, the ultrasonic wave having a short wavelength is distorted
and blunted due to the viscosity of the air or the like. As a result, as shown in FIG. 3 (e), the
amplitude component contained in the ultrasonic wave is self-demodulated in the air on the way
of propagation, and as a result, the position away from the ultrasonic wave generator (ultrasonic
speaker) An audible sound is generated at.
[0044]
On the other hand, in the vehicle personal acoustic device of the first embodiment, ultrasonic
waves (inaudible sound waves) whose amplitude is modulated according to the audio signal are
directed from the head ultrasonic speaker 1 only to the driver's head α. Radiate. Then, the
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amplitude component contained in the ultrasonic wave is not demodulated in air but is selfdemodulated at the driver's head α (such as a skull) and the driver's head is determined by the
amplitude component contained in the ultrasonic wave {see FIG. 3 (e)}. Vibrate the part α (such
as the skull). Thus, when the driver's head α vibrates with the sound wave component according
to the “audio signal serving as the sound source”, only the driver can hear the “audible
sound” by the “audio signal serving as the sound source”. it can.
[0045]
This specific data is shown in FIG. FIG. 4 uses "pink noise" as the "audio signal of the sound
source" for the purpose of measuring the frequency band of the audible sound. The solid line X in
FIG. 4 indicates the sound pressure level with respect to the frequency at which the driver sitting
in the driver's seat A listens, and the dashed dotted line Y in FIG. 4 indicates the sound pressure
level with respect to the frequency at which the occupant sitting in the passenger seat B listens
The dashed line Z in FIG. 4 indicates the sound pressure level of background noise with respect
to frequency. From the data shown in FIG. 4, the sound heard by the passenger sitting in the
passenger seat B (dotted dotted line Y) is almost equal to the background noise (broken line Z),
and the audible sound given by the head ultrasonic speaker 1 to the driver (solid line It can be
seen that X) is hardly audible to the passenger sitting in the front passenger seat B.
[0046]
[Effects of First Embodiment] As described above, the vehicle personal acoustic device of the first
embodiment gives an ultrasonic wave to the head portion α of the driver, and the amplitude
component contained in the ultrasonic wave is self-selected at the head portion α Demodulation
allows only the driver to hear audible sounds (voice, music, etc.) among the occupants in the car.
As a result, only the driver can obtain voice information such as navigation voice and traffic
information, or only the driver can enjoy music and radio without disturbing other crew
members.
[0047]
A second embodiment will be described with reference to FIGS. 5 and 6. The same reference
numerals as those in the first embodiment indicate the same functions. In the first embodiment
described above, an example in which an audible sound (voice, music, etc.) is heard only to the
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driver is shown as an example of a specific occupant. On the other hand, in the second
embodiment, (i) the audible sound (voice, music, etc.) is heard only to the crew of a specific group
(including one) selected among all the crews, (ii) different groups Give each passenger (including
one) a separate audible sound (such as voice or music) (including a separate audible sound for
each passenger), (iii) or On the other hand, they hear common audible sounds (voice, music, etc.).
[0048]
In the second embodiment, a plurality of head ultrasonic speakers 1 for irradiating ultrasonic
waves toward the head portion α of each passenger riding in each seat are independently
provided. The sound wave speaker 1 applies ultrasonic waves only to the inside of the range of
each broken line β shown in FIG. Further, as shown in FIG. 6, the ultrasonic wave amplitude
modulator 3 and the speaker drive unit 4 corresponding to each of the ultrasonic wave speakers
1 for the head are provided independently.
[0049]
Furthermore, while the main device 5 of the second embodiment is provided with the audio
signal input units 2 in a number corresponding to the number of the head ultrasound speakers 1
installed, a plurality of audio signal input units 2 are input. A distribution selection means 12
capable of various selection settings such as “allocate audio signals to be sound sources” to
each ultrasonic amplitude modulator 3 or “distribute to selected one or more groups” is
provided. It is done. Reference numeral 13 shown in FIG. 6 is a remote controller, which is
disposed at a position where the operation is easy by the occupant, and the occupant operates
the selection state by the distribution selection means 12.
[0050]
By providing in this way, (i) among all the crew members, audible sounds (such as voice and
music) are heard only to the crew members of the selected specific group (including one), (ii)
different groups (one Give each of the crew members an audible sound (such as voice or music)
to each of the crew members (including listening to each of the crew members separately), (iii) or
for all crew members, You can hear common audible sounds (voice, music, etc.).
[0051]
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A third embodiment will be described with reference to FIG.
In Examples 1 and 2 described above, an example is shown in which the head ultrasonic speaker
1 is used to irradiate ultrasonic waves to the head part α of the occupant. On the other hand, in
the third embodiment, the back ultrasound ultrasonic speaker 14 mounted after the back of the
seat is used.
[0052]
Specifically, in the third embodiment, the ultrasonic speaker 14 for the dorsal column is provided
by hanging it on the rear surface of the back of the seat on which the occupant sits, and the
ultrasonic speaker 14 for the spinal column is set. The ultrasonic waves are emitted toward the
occupant sitting in the rear. In addition, the ultrasonic amplitude modulator 3 and the speaker
drive part 4 corresponding to the ultrasonic speaker 14 for spines are provided in the ultrasonic
speaker 14 for spines, and the head of Example 1 and Example 2 is provided. It can be driven in
the same manner as the internal ultrasonic speaker 1. Here, FIG. 7 shows an example using a
speaker array in which a plurality of piezoelectric speakers 6 are arranged in a group as in the
first embodiment as an example of the ultrasonic speaker 14 for the spine, but the type of
ultrasonic generator is limited. It is not a thing.
[0053]
As shown in the third embodiment, in the case of using the ultrasound transducer for backrest
14, the amplitude component contained in the ultrasonic wave emitted from the ultrasound
transducer for backrest 14 toward the occupant is the body of the occupant. Demodulated, the
occupant's body vibrates with a sound wave component according to the "audio signal that has
become a sound source". As described above, by using the back ultrasound ultrasonic speaker
14, an audible sound (voice, music, etc.) can be heard by the occupant sitting behind the seat on
which the back ultrasound ultrasonic speaker 14 is installed. In addition, since the ultrasound
ultrasonic speaker 14 for spine is installed by hanging after the spine of the seat, versatility is
enhanced, and the number of occupants who individually hear audible sounds (voice, music, etc.)
can be easily increased or decreased. It becomes possible.
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[0054]
A fourth embodiment will be described with reference to FIG. In Examples 1 and 2 described
above, an example is shown in which the head ultrasonic speaker 1 is used to irradiate ultrasonic
waves to the head part α of the occupant. On the other hand, in the fourth embodiment, the
head mounted ultrasonic speaker 15 mounted on the human head α is used.
[0055]
Specifically, as shown in FIG. 8, in the head mounted ultrasonic speaker 15 according to the
fourth embodiment, the small-sized piezoelectric speaker 6 is attached to a portion of the handle
of the glasses 16 (a member placed on the ear in the glasses component). The piezoelectric
speaker 6 irradiates ultrasonic waves toward the head α of the person wearing the glasses 16.
The ultrasonic wave amplitude modulator 3 and the speaker driving unit 4 corresponding to the
head mounted ultrasonic wave speaker 15 are provided in the head mounted ultrasonic wave
speaker 15, and the head of the embodiment 1 and the embodiment 2 is provided. It can be
driven in the same manner as the internal ultrasonic speaker 1. The speaker driving unit 4 and
the piezoelectric speaker 6 of the head mounted ultrasonic speaker 15 are connected via a
speaker cable 11 which is designed so as not to restrict the movement of the occupant.
[0056]
As shown in the fourth embodiment, when the head-mounted ultrasonic speaker 15 is used, the
amplitude component contained in the ultrasonic wave emitted from the head-mounted
ultrasonic speaker 15 toward the head α is the head. It vibrates with a sound wave component
corresponding to the “audio signal that has become a sound source” that is self-demodulated
in the vicinity of the skull of the part α or the auditory organ. As described above, audible sound
(voice, music, etc.) can be heard only to the person wearing the head-mounted ultrasonic speaker
15.
[0057]
In addition, the head-mounted ultrasonic speaker 15 does not have to close the ear like an
earphone or headphones. For this reason, even if the head-mounted ultrasonic speaker 15 is
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attached, the ear can always be opened without being blocked, so that "other audible sounds
(such as running sounds and conversations)" different from the audio signal are heard It can be
heard from all the time, and as a result, unlike earphones and headphones, it has excellent safety
for vehicles.
[0058]
In the fourth embodiment, a glasses type (a type of mounting of the ultrasonic speaker by
glasses) is shown as an example of the ultrasonic speaker 15 for head mounting, but it is a means
for enabling mounting of the ultrasonic speaker on the head α For example, a hair band type, a
head type, a hat type, or a hair stop type (clip type) attached to the hair can be appropriately
changed.
[0059]
In the above-described first and second embodiments, an example has been described in which a
monaural audible sound is given to the occupant, but the head ultrasonic speaker 1 is provided in
stereo to give a stereo audible sound to the occupant. It may be provided.
Specifically, "the ultrasonic speaker for the right ear giving ultrasound toward the head near the
right ear of the occupant" and "the ultrasonic for the left ear giving ultrasound toward the head
near the left ear of the occupant." While providing the “speaker”, the ultrasonic amplitude
modulator 3 and the speaker drive unit 4 corresponding to each of the left and right may be
provided to perform stereo reproduction with the head part α of the occupant. Similarly,
piezoelectric speakers 6 are provided on each of the left and right handles of the glasses 16
shown in the fourth embodiment, and the piezoelectric speakers 6 on the left and right of the
glasses 16 are independently driven to give stereo audible sound to a person. It may be provided
in
[0060]
Although the above-described embodiment shows an example in which the device for generating
an audio signal is mounted outside the main device 5, a device for generating an audio signal
may be incorporated in the main device 5. In other words, the "device for generating an audio
signal" and the "device of the present invention" may be integrated. The vehicle equipped with
the vehicle personal audio system is not limited to the passenger car shown in the embodiment,
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and can be applied to various vehicles such as bus vehicles and truck vehicles.
[0061]
1 ultrasonic speaker for head 2 audio signal input unit 3 ultrasonic amplitude modulator 4
speaker driving unit 12 distribution selecting means 14 ultrasonic speaker for spine 15
ultrasonic speaker for head mounting A driver's seat α head
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