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JP2007228471

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2007228471
The present invention enables local acoustic reproduction by reproducing acoustic signal data on
the side of a portable terminal using an ultrasonic speaker installed outside a street corner or the
like. A wireless communication can be performed between an ultrasonic speaker 1 and a portable
terminal 2 installed in a street corner or the like, and acoustic signal data is wirelessly
transmitted from the portable terminal 2 to the ultrasonic speaker 1. The ultrasonic speaker 1
generates an audio frequency signal (audio signal) from the sound signal data received from the
portable terminal 2 and modulates the carrier wave of the ultrasonic frequency band with this
audio frequency signal, and this modulation signal is ultrasonic wave The transducer converts it
into an acoustic signal and emits it into the air. As a result, local acoustic reproduction can be
performed using the ultrasonic speaker 1 installed outside the street corner, etc. without using
the portable terminal's own headphone or built-in speaker. [Selected figure] Figure 1
Sound reproduction system, ultrasonic speaker, portable terminal, and sound reproduction
method
[0001]
The present invention relates to an acoustic reproduction system using an ultrasonic speaker, an
ultrasonic speaker, a portable terminal, and an acoustic reproduction method, and in particular,
without using the portable terminal's own headphone or built-in speaker, the outside such as a
street corner. The present invention relates to an acoustic reproduction system, an ultrasonic
speaker, a portable terminal, and an acoustic reproduction method that can perform local
acoustic reproduction using an ultrasonic speaker installed in the computer.
[0002]
03-05-2019
1
Conventionally, it has been known that an ultrasonic speaker that utilizes the nonlinearity of the
medium (air) to ultrasonic waves can reproduce signals in the audio frequency band having a
much sharper directivity than conventional speakers ( See, for example, Patent Document 1).
[0003]
The ultrasonic speaker uses an ultrasonic transducer as a sound source, and as the ultrasonic
transducer, a piezoelectric ultrasonic transducer, an electrostatic ultrasonic transducer or the like
is used (for example, Patent Document 2, See 3).
[0004]
In such an ultrasonic speaker, a carrier wave in the ultrasonic frequency band is modulated by a
signal from an audio frequency band (audio signal) signal source, and this modulated wave is
amplified by a power amplifier or the like and then applied to an ultrasonic transducer. Do.
The ultrasonic transducer converts the applied modulated wave into a sound wave of finite
amplitude level and emits it into the medium (in air).
Thereby, the audio signal sound of the original audio frequency band is reproduced by the nonlinear effect of the medium (air).
In this case, the reproduction range of the reproduction signal in the audio frequency band is a
beam-like range from the ultrasonic transducer in the direction of the emission axis.
[0005]
On the other hand, headphone reproduction or reproduction by a small built-in speaker is a
general method for reproduction of sound signal data such as music in a portable terminal such
as a portable telephone. However, in headphone reproduction, there is an inconvenience
associated with wearing headphones. Further, in the case of reproduction by the built-in speaker,
the volume is generally small, and the reproduction range is expanded, so it is necessary to pay
attention to the surroundings. JP-A-58-119293 JP-A-2000-50387 JP-A-2000-50392
03-05-2019
2
[0006]
As described above, headphone reproduction or reproduction by a small built-in speaker is a
general method for reproduction of sound signal data such as music in a portable terminal.
However, in headphone reproduction, there has been an inconvenience associated with wearing
headphones. In addition, in the case of reproduction by the built-in speaker, the volume is
generally small and the reproduction range is expanded, so it was necessary to pay attention to
the surroundings.
[0007]
The present invention has been made to solve such a problem, and an object thereof is to use an
ultrasonic speaker installed outside a street corner or the like without using the portable
terminal's own headphone or built-in speaker. It is an object of the present invention to provide a
sound reproduction system, an ultrasonic speaker, a portable terminal, and a sound reproduction
method that can perform local sound reproduction and enjoy sound reproduction without
worrying about the surroundings.
[0008]
The present invention has been made to solve the above problems, and an acoustic reproduction
system according to the present invention comprises a portable terminal and an ultrasonic
speaker for receiving and reproducing acoustic signal data from the portable terminal by radio.
Sound reproduction system, the portable terminal is instructed to reproduce sound signal data,
operation means for selecting the ultrasonic speaker as an output destination of the reproduction
signal, and the ultrasonic speaker is selected by the operation means And wireless
communication control means for wirelessly transmitting the acoustic signal data to the
ultrasonic speaker, and the ultrasonic speaker is wireless for receiving the acoustic signal data
wirelessly transmitted from the portable terminal. Communication control means and an audio
frequency signal are generated from sound signal data received from the portable terminal, and
the audio frequency signal is used to generate an ultrasonic frequency band. Modulating the A
signal, the modulation signal is converted into an acoustic signal by the ultrasonic transducer,
characterized in that it comprises a means for radiating to the air.
In the sound reproduction system having such a configuration, wireless communication can be
performed between the portable terminal and the ultrasonic speaker installed outside the street
03-05-2019
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corner, etc., and the acoustic signal data is wirelessly transmitted from the portable terminal to
the ultrasonic speaker Do. The ultrasonic speaker generates an audio frequency signal (audio
signal) from acoustic signal data received from the portable terminal, modulates the carrier wave
of the ultrasonic frequency band with the audio frequency signal, and modulates this modulation
signal with the ultrasonic transducer Converts into sound waves and emits them into the air.
Thereby, local acoustic reproduction can be performed using an ultrasonic speaker installed
outside the street corner or the like without using the portable terminal's own headphone or
built-in speaker. In addition, sound reproduction can be enjoyed without worrying about the
surroundings.
[0009]
Further, in the sound reproduction system according to the present invention, the ultrasonic
speaker includes a wireless communication control unit that receives sound signal data wirelessly
from the portable terminal, and a carrier wave oscillation source that generates a carrier signal in
an ultrasonic frequency band. An audio frequency wave oscillation source generating an audio
frequency band signal from the audio signal data; performing processing of reproducing the
audio signal data received from the wireless communication control unit by the audio frequency
wave oscillation source; and the carrier wave oscillation A reproduction control unit for
controlling the output of the source; and a modulator for generating a modulation signal
obtained by modulating the carrier wave signal output from the carrier wave oscillation source
with an audio frequency wave signal output from the audio frequency wave oscillation source A
power amplifier for amplifying a modulated signal output from the modulator, and a modulated
signal amplified by the power amplifier into an acoustic signal to be transmitted to the air
Characterized in that it comprises an ultrasonic transducer for emitting. The ultrasonic speaker
of the sound reproduction system having such a configuration receives sound signal data from
the portable terminal, and generates an audio frequency wave signal based on the received sound
signal data. Then, the carrier wave in the ultrasonic frequency band is modulated by this audio
frequency signal. The modulated signal is amplified by a power amplifier and applied to an
ultrasonic transducer. The ultrasonic transducer converts the modulated signal amplified by the
power amplifier into a sound wave of finite amplitude level and emits it into air. Thereby, local
acoustic reproduction can be performed using an ultrasonic speaker installed outside the street
corner or the like without using the portable terminal's own headphone or built-in speaker. In
addition, sound reproduction can be enjoyed without worrying about the surroundings.
[0010]
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Further, in the sound reproduction system according to the present invention, the portable
terminal includes a reproduction signal DB for storing sound signal data to be reproduced, an
external connection terminal detection unit for detecting presence or absence of connection of an
external reproduction device such as headphones, and the external An external reproduction
output unit that outputs a reproduction signal of acoustic signal data to the external
reproduction device when the connection terminal detection unit detects a connection of the
external reproduction device, and an internal that outputs a reproduction signal of acoustic
signal data to a built-in speaker A reproduction output unit, a wireless communication control
unit for wirelessly transmitting acoustic signal data to the ultrasonic speaker, an operation unit
for instructing reproduction of the acoustic signal data, and selecting an output destination of the
acoustic signal data; A reproduction control unit that performs reproduction processing based on
an instruction from an operation unit, and sound signal data stored in the reproduction signal DB
based on an output instruction from the reproduction control unit Whether the external read
output circuit, characterized by comprising a reproduction signal management unit either
internal reproduction output circuit, or output to the wireless communication control unit. In the
portable terminal of the sound reproduction system having such a configuration, in addition to
the reproduction device of the portable terminal itself such as a headphone or a built-in speaker,
an external ultrasonic speaker installed in a street corner is operated as a reproduction
destination of acoustic signal data. Make it selectable by department. Then, when an external
ultrasonic speaker is selected, sound signal data is wirelessly transmitted to the ultrasonic
speaker. As a result, in addition to the reproduction device of the portable terminal itself such as
a headphone and a built-in speaker, an ultrasonic speaker installed outside such as a street
corner can be selected as a reproduction destination of the sound signal data. When an ultrasonic
speaker is selected, local acoustic reproduction can be performed using the ultrasonic speaker
without using the portable terminal's own headphone or built-in speaker. In addition, sound
reproduction can be enjoyed without worrying about the surroundings.
[0011]
Further, the ultrasonic speaker according to the present invention is the ultrasonic speaker in an
acoustic reproduction system including a portable terminal and an ultrasonic speaker for
receiving and reproducing acoustic signal data wirelessly transmitted from the portable terminal.
A wireless communication control unit for receiving acoustic signal data wirelessly from the
portable terminal, a carrier wave oscillation source for generating a carrier signal of an ultrasonic
frequency band, and an audible signal for generating an audio frequency band signal from the
acoustic signal data A frequency wave oscillation source; a reproduction control unit for
performing processing of reproducing acoustic signal data received from the wireless
communication control unit with the audio frequency wave oscillation source; and performing
output control of the carrier wave oscillation source; A modulation signal is generated by
03-05-2019
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modulating a carrier wave signal output from an oscillation source with an audio frequency wave
signal output from the audio frequency wave oscillation source. And a power amplifier for
amplifying the modulation signal output from the modulator, and an ultrasonic transducer for
converting the modulation signal amplified by the power amplifier into an acoustic signal and
emitting it into the air. I assume. The ultrasonic speaker having such a configuration receives
acoustic signal data from the portable terminal, and generates an audio frequency wave signal
based on the received acoustic signal data. Then, the carrier wave in the ultrasonic frequency
band is modulated by this audio frequency signal. The modulated signal is amplified by a power
amplifier and applied to an ultrasonic transducer. The ultrasonic transducer converts the
modulated signal amplified by the power amplifier into a sound wave of finite amplitude level
and emits it into air. Thereby, local acoustic reproduction can be performed using an ultrasonic
speaker installed outside the street corner or the like without using the portable terminal's own
headphone or built-in speaker. In addition, sound reproduction can be enjoyed without worrying
about the surroundings.
[0012]
Further, the portable terminal of the present invention generates an audio frequency signal from
the portable terminal and acoustic signal data received by radio from the portable terminal,
modulates a carrier signal in an ultrasonic frequency band with the audio frequency signal, and
performs the modulation The portable terminal in an acoustic reproduction system comprising
an ultrasonic speaker that converts a signal into an acoustic signal and emits the sound into the
air, the reproduction signal DB storing acoustic signal data to be reproduced, and external
reproduction such as headphones An external connection terminal detection unit that detects the
presence or absence of connection of the device, and an external reproduction that outputs a
reproduction signal of acoustic signal data to the external reproduction device when the
connection of the external reproduction device is detected by the external connection terminal
detection unit. An output unit, an internal reproduction output unit for outputting a reproduction
signal of acoustic signal data to a built-in speaker, and wireless communication for wirelessly
transmitting the acoustic signal data to the ultrasonic speaker Control unit, an operation unit for
instructing reproduction of sound signal data, an operation unit for selecting an output
destination of the sound signal data, a reproduction control unit for performing reproduction
processing based on an instruction from the operation unit, and the reproduction And a
reproduction signal management unit for outputting the audio signal data stored in the
reproduction signal DB to the external reproduction output circuit, the internal reproduction
output circuit, or the wireless communication control unit based on an output instruction from
the control unit. It is characterized by having. In the portable terminal having such a
configuration, as the reproduction destination of the acoustic signal data, in addition to the
reproduction device of the portable terminal itself such as the headphone and the built-in
03-05-2019
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speaker, the external ultrasonic speaker installed in the street corner etc. can be selected Let's do
it. Then, when an external ultrasonic speaker is selected, sound signal data is wirelessly
transmitted to the ultrasonic speaker. As a result, in addition to the reproduction device of the
portable terminal itself such as a headphone and a built-in speaker, an ultrasonic speaker
installed outside such as a street corner can be selected as a reproduction destination of the
sound signal data. When an ultrasonic speaker is selected, local acoustic reproduction can be
performed using the ultrasonic speaker without using the portable terminal's own headphone or
built-in speaker. In addition, sound reproduction can be enjoyed without worrying about the
surroundings.
[0013]
Further, a sound reproducing method according to the present invention is a sound reproducing
method in a sound reproducing system including a portable terminal and an ultrasonic speaker
for receiving and reproducing acoustic signal data from the portable terminal by wireless. When
the ultrasonic speaker is selected by the control unit in the terminal, an instruction to reproduce
the acoustic signal data, an operation procedure for selecting the ultrasonic speaker as an output
destination of the reproduction signal, and the ultrasonic speaker is selected by the operation
procedure, A wireless communication control procedure of wirelessly transmitting signal data to
the ultrasonic speaker is performed, and wireless communication for receiving acoustic signal
data wirelessly transmitted from the portable terminal by the control unit in the ultrasonic
speaker And generating an audio frequency signal from sound signal data received from the
portable terminal, and controlling the ultrasonic frequency band by the audio frequency signal.
Modulating the A signal, the modulation signal is converted into an acoustic signal by the
ultrasonic transducer, characterized in that a step of radiating in the air takes place. In the sound
reproduction method of such a procedure, wireless communication can be performed between
the portable terminal and an ultrasonic speaker installed outside the street corner etc., and the
acoustic signal data is wirelessly transmitted from the portable terminal to the ultrasonic speaker
Do. The ultrasonic speaker generates an audio frequency signal (audio signal) from acoustic
signal data received from the portable terminal, modulates the carrier wave of the ultrasonic
frequency band with the audio frequency signal, and modulates this modulation signal with the
ultrasonic transducer Converts into sound waves and emits them into the air. Thereby, local
acoustic reproduction can be performed using an ultrasonic speaker installed outside the street
corner or the like without using the portable terminal's own headphone or built-in speaker. In
addition, sound reproduction can be enjoyed without worrying about the surroundings.
[0014]
Next, the best mode for carrying out the present invention will be described with reference to the
03-05-2019
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drawings.
[0015]
FIG. 1 is a view for explaining the outline of the sound reproduction system of the present
invention.
The example shown in FIG. 1 is an example in which the sound reproduction system of the
present invention is provided at any place such as a street corner. Wireless communication can
be performed between the ultrasonic speaker 1 and the portable terminal 2, and acoustic signal
data is wirelessly transmitted from the portable terminal 2 to the ultrasonic speaker 1.
[0016]
In this ultrasonic speaker 1, an amplitude modulation (AM modulation) is performed on an
ultrasonic signal called a carrier wave with an audio frequency signal (audio signal) reproduced
from acoustic signal data, and this modulation signal is brought into the air by the ultrasonic
transducer. discharge. When this modulated wave is released into the air, the non-linearity of the
air causes the original audio signal to self-reproduce in the air.
[0017]
That is, since the sound wave is a compressional wave transmitted through the air as a medium,
in the process of propagating the modulated ultrasonic wave, the dense portion and the sparse
portion of the air become prominent, and the dense portion has a high sound velocity, Since the
sound velocity is low in the sparse portion, the modulation wave itself is distorted, and as a
result, the waveform is separated into the carrier wave (ultrasound) and the audio wave (original
audio signal). We humans can only hear audible sound (original audio signal) below 20 kHz.
Further, the acoustic signal output from the ultrasonic speaker 1 has directivity and a
reproduction range according to the frequency of the carrier wave, which enables local acoustic
reproduction.
[0018]
03-05-2019
8
As described above, the sound reproduction system of the present invention is characterized in
that reproduction of sound signal data by the built-in speaker (or headphone) on the portable
terminal 2 side can be switched to external sound source reproduction by the ultrasonic speaker
1. There is. In addition, by using the ultrasonic speaker 1 capable of locally reproducing sound as
an external sound source, it is characterized in that sound signal data on the portable terminal 1
side can be personally listened in a public area.
[0019]
FIG. 2 is a view showing a configuration example of an ultrasonic speaker used in the sound
reproduction system of the present invention. In the ultrasonic speaker 1 shown in FIG. 2, the
wireless communication control unit 11 receives acoustic signal data from the portable terminal
2 by wireless communication. The reproduction control unit 12 performs processing for
reproducing the acoustic signal data obtained from the wireless communication control unit 11
with the audio frequency wave oscillation source 14, and performs output control of the carrier
wave oscillation source 13. The carrier wave oscillation source 13 generates and outputs a
carrier wave in the ultrasonic frequency band. An audio frequency signal generator (audio signal
source) 14 converts sound signal data received from the portable terminal 2 into an audio signal
wave of an audio wave frequency band. The modulator 15 modulates the carrier wave signal
output from the carrier wave oscillation source 13 with the audio signal wave output from the
audio frequency wave oscillation source 14 to generate a modulation signal. The power amplifier
16 amplifies the modulation signal output from the modulator 15. The ultrasonic transducer 17
converts the modulated signal amplified by the power amplifier 16 into a sound wave of a finite
amplitude level and emits it into air.
[0020]
In the above configuration, acoustic signal data received from the portable terminal 2 by the
wireless communication control unit 11 is converted into an audio signal wave by the audio
frequency wave oscillation source 14. The carrier wave of the ultrasonic frequency band
outputted from the carrier wave oscillation source 13 is modulated by the modulator 15 by the
audio signal wave. Then, the modulated wave output from the modulator 15 is amplified by the
power amplifier 16, and the ultrasonic transducer 17 is driven by the amplified modulation
signal. As a result, the modulation signal is converted by the ultrasonic transducer 17 into a
sound wave of finite amplitude level. This sound wave is radiated into the medium (in air), and
03-05-2019
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the signal sound in the original audio frequency band is self-regenerated by the non-linear effect
of the medium (air).
[0021]
In the ultrasonic speaker 1, the directivity and the reproduction range of the acoustic signal
output from the ultrasonic transducer 17 can be adjusted by changing the frequency of the
carrier wave signal output from the carrier wave oscillation source 13. Therefore, when installing
the ultrasonic speaker 1, the installation location of the ultrasonic speaker 1 and the spot for
reproducing the acoustic signal (a position designated by the holder of the portable terminal, for
example, the paint is indicated on the ground) Depending on the position, the direction of the
ultrasonic transducer 17 is set, and the frequency of the carrier wave is selected.
[0022]
As described above, by reproducing the acoustic signal data using the ultrasonic speaker, it is
possible to locally use the ultrasonic speaker installed outside the street corner etc. without using
the portable terminal's own headphone or built-in speaker. Sound reproduction can be
performed. In addition, sound reproduction can be enjoyed without worrying about the
surroundings.
[0023]
FIG. 3 is a diagram showing a configuration example of a portable terminal used in the sound
reproduction system of the present invention. The portable terminal shown in FIG. 3 is a portable
telephone, a PDA (Personal Digital Assistance), or the like, and only its portion directly related to
the present invention is shown as its internal configuration.
[0024]
In the portable terminal 2 shown in FIG. 3, the operation unit 21 instructs reproduction of
acoustic signal data and selects an output destination of the acoustic signal data. The
reproduction control unit 22 performs reproduction processing based on an instruction from the
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operation unit 21. The reproduction signal DB 23 stores sound signal data such as music.
[0025]
The reproduction signal management unit 24 extracts the sound signal data stored in the
reproduction signal DB 23 based on the output instruction from the reproduction control unit 22,
and whether the sound signal data is an external reproduction output unit 27 or an internal
reproduction output unit 29. Or output to the wireless communication control unit 30. The
external connection terminal detection unit 26 detects the presence or absence of connection of
an external reproduction device such as the headphone 25.
[0026]
The external reproduction output unit 27 outputs a reproduction signal of acoustic signal data to
the headphones 25 or the like when an external reproduction device such as the headphones 25
is connected. The internal reproduction output unit 29 outputs a reproduction signal of acoustic
signal data to the built-in speaker 28 when reproduction is performed by the built-in speaker 28.
The wireless communication control unit 30 transmits acoustic signal data to the ultrasonic
speaker 1 by wireless communication.
[0027]
In the above configuration, the operation unit 21 of the portable terminal 2 instructs to
reproduce the audio signal data and select the output destination, and the reproduction signal is
output according to the selection of the output destination. In this example, in addition to the
conventional reproduction method in which reproduction is performed by the headphone 25 or
by the built-in speaker 28, ON / OFF selection of external speaker (ultrasonic speaker)
reproduction can be performed by the operation unit 21. .
[0028]
When external speaker (ultrasonic speaker) reproduction is turned on by the operation unit 21 of
the mobile terminal, the reproduction control unit 22 instructs the reproduction signal
management unit 24 to output sound signal data to the wireless communication control unit 30.
Will be sent.
03-05-2019
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[0029]
The reproduction signal management unit 24 extracts the sound signal data stored in the
reproduction signal DB 23, and outputs the sound signal data to the wireless communication
control unit 30.
Then, the acoustic signal data is transmitted from the wireless communication control unit 30 to
the ultrasonic speaker 1 by wireless communication. Thereafter, the acoustic signal data is
reproduced by the ultrasonic speaker 1. The wireless transmission of the sound signal data to the
ultrasonic speaker 1 may be collectively transmitted, or may be either real time transmission
according to the reproduction time.
[0030]
Moreover, FIG. 4 is a figure which shows the flow of the process in a portable terminal, and
arrange | positions and shows the flow of the process in the portable terminal 2 mentioned
above. The flow of the process will be described below with reference to FIG.
[0031]
When reproduction of sound signal data is to be started (step S1), first, it is selected by the
operation unit 21 whether external speaker (ultrasonic speaker) reproduction is to be performed
by wireless communication (step S2).
[0032]
If it is determined in step S2 that external speaker (ultrasonic speaker) reproduction is selected,
the wireless communication control unit 30 wirelessly transmits acoustic signal data to the
ultrasonic speaker 1 (step S3).
Then, reproduction of sound signal data is started by the ultrasonic speaker 1.
03-05-2019
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[0033]
If it is determined in step S2 that external speaker (ultrasonic speaker) reproduction is not
selected, then it is determined by the external connection terminal detection unit 26 whether
headphones or the like are connected to the external connection terminal (see FIG. Step S4). If it
is determined that a headphone or the like is connected to the external connection terminal, a
reproduction signal of audio signal data is output from the external reproduction output unit 27
to the headphone or the like, and reproduction is started (step S5). When it is determined that
the headphone or the like is not connected to the external connection terminal, the reproduction
signal of the sound signal data is output from the internal reproduction output unit 29 to the
built-in speaker 28, and reproduction is started (step S6).
[0034]
As described above, in the sound reproduction system of the present invention, sound signal data
on the portable terminal side can be reproduced by any ultrasonic speaker installed in a street
corner or the like. As a result, local acoustic reproduction can be performed using an ultrasonic
speaker installed in a street corner or the like without using the portable terminal's own
headphone or built-in speaker. In addition, sound reproduction can be enjoyed without worrying
about the surroundings.
[0035]
The sound reproduction system of the present invention can be installed in any place, such as
inside a building, outside a building, in a play facility, in a park, etc., in addition to being installed
in a street corner or the like. In addition, the number of ultrasonic speakers to be installed is not
limited to one, and a plurality of ultrasonic speakers are installed at one place (arranged so that
the reproduction positions of audible sound signals from ultrasonic speakers do not overlap) You
can also do it.
[0036]
As mentioned above, although the embodiment of the present invention was described, the sound
reproduction system of the present invention is not limited only to the above-mentioned
illustrated example, and various changes can be added in the range which does not deviate from
03-05-2019
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the gist of the present invention. Of course.
[0037]
The figure for demonstrating the outline | summary of the sound reproduction system of this
invention.
The figure which shows the structural example of the ultrasonic speaker of this invention. The
figure which shows the structural example of the portable terminal of this invention. The figure
which shows the flow of the process in a portable terminal.
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 ... Ultrasonic speaker, 2 ... Mobile terminal, 11 ... Wireless
communication control part, 12 ... Reproduction control part, 13 ... Carrier wave oscillation
source, 14 ... Audio frequency wave oscillation source, 15 ... Modulator, 16 ... Power amplifier, 17
... ultrasonic transducer, 21 ... operation unit, 22 ... reproduction control unit, 23 ... reproduction
signal DB, 24 ... reproduction signal management unit, 25 ... headphone, 26 ... external
connection terminal detection unit, 27 ... external reproduction output unit, 28 ... Built-in speaker,
29 ... Internal playback output unit, 30 ... Wireless communication control unit
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