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JP2001148898

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2001148898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
system for simultaneously broadcasting information in a plurality of voice bands without spatial
interference.
[0002]
2. Description of the Related Art In the conventional space broadcasting, it is general to amplify
sound waves in the audio frequency band which can be heard by the human ear in the natural
frequency band and to transmit from the speaker. In the case where several types of broadcasts
are spatially divided and simultaneously performed by this method, a plurality of speakers are
provided for each of the broadcasts. However, since sound waves in the audible frequency band
have wide directivity, they are likely to interfere with each other. In the prior art, as a solution to
this problem, the volume of each speaker is reduced, the installation interval of each speaker is
increased, a dedicated room is provided for each broadcast, a horn is used to divide by a wall, etc.
Measures are taken such as using headphones.
[0003]
FIG. 1 shows an example in which a room is divided for each broadcast purpose to avoid
interference by using the prior art, and two broadcasts are simultaneously transmitted to one
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room. For this purpose, one room is divided by a partition plate 105 for blocking sound waves,
divided into a room 101 and a room 102, a speaker 103 for broadcasting broadcast contents A is
installed in the room 101, and broadcast contents B are broadcasted in a room 102 The speaker
104 is installed. In this way, even if the broadcast contents A and B are sent simultaneously, the
two broadcasts will not interfere with each other because the partition plate 105 is present, and
the listener can enter the room he / she wants to hear and hear the broadcast. In this broadcast
system, it is necessary to prepare a room for each broadcast content, and it is difficult to prepare
for both cost and space. In addition, it also takes time and effort for the listener to find a room in
which the broadcast he / she wants to hear is flowing.
[0004]
FIG. 2 shows an example of an international conference where people using different languages
gather in a broadcasting system using the prior art, in which the interpreter performs
simultaneous interpretation in accordance with the language of the conference participants. The
conference participants 201, 202 speak language A, and the conference participants 203, 204
speak language B. The words spoken by the meeting participants 201 or 202 are simultaneously
translated into the language B by the interpreter 206, converted into an electric signal by the
microphone 208, transmitted to the headphones of the meeting participants 203 and 204 by the
amplifier 210, and And 204 can hear the translated content. On the other hand, the words
spoken by the conference participants 203 or 204 are simultaneously translated into the
language A by the interpreter 205, converted into an electric signal by the microphone 207,
transmitted to the headphones of the conference participants 201 and 202 by the amplifier 209,
and participating in the conference. Persons 201 and 202 listen to the translated content. In such
a broadcasting apparatus, since headphones are used, a plurality of wiring of an amplifier and a
microphone are required, and a conference participant has the trouble of putting on the
headphones and it is troublesome.
[0005]
As described above, the broadcasting apparatus using the prior art requires measures such as
shielding in order to prevent the interference of a plurality of broadcasts simultaneously
broadcast, and the material cost and the design cost There is a problem that costs such as are
expensive. The use of headphones takes time and effort for the listener to wear the headphones,
and the headphones need to be as many as the number of listeners. Although there is a method
of reducing the volume of the speaker as a method of dividing without using the shield, there is a
problem that when the volume of the speaker is reduced, the volume is small and difficult to
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hear.
[0006]
The object of the present invention is that there is no interference between sound waves when
spatially dividing many types of broadcast contents and broadcasting simultaneously, reducing
the cost for measures against interference, there is no leakage of sound, and it is easy to hear,
headphones In order to provide a space division simultaneous broadcasting system which does
not need to be equipped with
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is a
system for transmitting an ultrasonic wave whose amplitude is modulated by information in an
audio frequency band from the transmitter with directivity and different audibleness. The present
invention provides a space division simultaneous broadcasting system characterized in that
ultrasonic waves amplitude-modulated with frequency band information are transmitted from
different transmitters (ultrasound transducers), and the transmission ranges of the different
transmitters are spatially different.
[0008]
Further, according to the present invention, a sound source generating broadcast contents, an
ultrasonic oscillator generating an ultrasonic local signal, amplitude-modulating the ultrasonic
local signal with a signal from the sound source, and outputting an ultrasonic band modulated
wave signal Multiple sets of ultrasound broadcast systems consisting of a modulator, an amplifier
for amplifying an ultrasonic band modulated wave signal, and an ultrasonic transducer for
emitting the amplified ultrasonic band modulated wave signal into space as ultrasonic waves.
Further, the present invention provides a space division simultaneous broadcasting system
characterized in that the ultrasonic radiation areas of the ultrasonic broadcasting system are
arranged so as to be less overlapped with each other.
[0009]
Furthermore, the present invention, in the above-mentioned space division simultaneous
broadcasting system, means for variably controlling the frequency of the ultrasonic local signal
generated by each ultrasonic generator for adjusting so that the overlap of the ultrasonic
radiation areas is reduced. Provided is a space division simultaneous broadcasting system
characterized by being provided.
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[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail below.
FIG. 3 shows an embodiment of the present invention.
In FIG. 3, the room 301 has no partition plate and is one room.
Ultrasonic transducers 302 and 303 are installed on the ceiling of the room.
An area 304 is an arrival area of ultrasonic waves from the ultrasonic transducer 302, and an
area 305 is an arrival area of ultrasonic waves from the ultrasonic transducer 303. FIG. 4 shows
a block diagram of the system of the present invention. It is a case of the structure which
transmits two broadcasts simultaneously to one room. The ultrasound local signal from the
ultrasound generator 404 is amplitude modulated by the modulator 402 with a signal in the
audio frequency band of the sound source 401. The output of the modulator 402 is amplified by
an amplifier 403 and sent out to space by an ultrasonic transducer 302. The ultrasonic local
signal from the ultrasonic oscillator 404 can change its oscillation frequency by adjusting the
variable resistor 405. On the other hand, the ultrasonic local signal from the ultrasonic generator
409 is amplitude-modulated by the modulator 407 with a signal in the audio frequency band of
the sound source 406. The output of modulator 407 is amplified by amplifier 408 and sent out
to space by ultrasonic transducer 303. The ultrasonic local signal from the ultrasonic generator
409 can change its oscillation frequency by adjusting the variable resistor 410.
[0011]
Hereinafter, the operation of the present invention will be described. The broadcast from the
sound source 401 and the sound source 406 is spatially divided and simultaneously transmitted
to the listener who is in the room 301 in FIG. The signals from the sound sources 401, 406 have
frequencies in the range of the human audio frequency band (30 Hz to 20 kHz). On the other
hand, the frequency of the ultrasonic waves of the ultrasonic oscillators 404 and 409 is a
frequency inaudible to humans. A signal from the sound source 401 amplitude-modulates the
ultrasonic local signal from the ultrasonic oscillator 404 by the modulator 402, is amplified by
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the amplifier 403, and is sent out from the ultrasonic transducer 302 to the room 301 as an
ultrasonic wave. On the other hand, the signal from the sound source 406 amplitude modulates
the ultrasonic local signal from the ultrasonic oscillator 409 by the modulator 407, is amplified
by the amplifier 408, and is sent out from the ultrasonic transducer 303 to the room 301 as an
ultrasonic wave. The area 304 of the ultrasonic wave from the ultrasonic transducer 302 and the
area 305 of the ultrasonic wave from the ultrasonic transducer 303 determine the transmission
directions of the ultrasonic transducers 302 and 303 so that they do not overlap each other, and
the variable resistor 405 , Adjust 410. The areas 304 and 305 become smaller when the variable
resistors 405 and 410 are adjusted to raise the transmission frequency of the output ultrasonic
local signal from the ultrasonic oscillator, and the areas 304 and 305 become larger when the
output ultrasonic frequency is lowered. . Since the frequency of the transmitted ultrasonic wave
is much higher than the signal frequency of the audio frequency band, the directivity is sharp,
and it is possible to divide the area 304 and the area 305 so as to reduce the overlap.
[0012]
The ultrasound transmitted from the ultrasound transducer 302 to space is envelope-detected by
the nonlinearity of air with respect to the ultrasound, and the signal of the sound source 401 is
demodulated, so that the listener in the area 304 is amplitude modulated. A signal in the audio
frequency band of the sound source 401 can be heard. The ultrasonic waves transmitted from
the ultrasonic transducer 303 to space are envelope-detected by the nonlinearity of air to the
ultrasonic waves, and a listener in the area 305 can listen to signals in the audio frequency band
of the sound source 406. Since there is little overlap between the areas 304 and 305, the signals
from the sound source 401 and the sound source 406 hardly interfere even if there is no
partition in the room 301, and the listener in the room 301 either signal depending on its
position It will be possible to hear In FIG. 1, since the listeners in the areas 304 and 305 of the
room 301 are the same number, the range of the areas 304 and 305 is displayed with almost the
same size, but if there are many listeners in the area 305, the area 305 It is also possible to make
the area 304 smaller and to make the area 304 smaller. For this purpose, the oscillation
frequency of the ultrasonic oscillator 404 may be increased and the oscillation frequency of the
ultrasonic oscillator 409 may be decreased. Generally, it is known that high frequency ultrasonic
waves have sharp directivity characteristics, and this is used to control the reach area of the
ultrasonic waves transmitted by the ultrasonic transducer.
[0013]
Next, another embodiment of the present invention will be described. FIG. 5 shows the case
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where the present invention is applied to an international conference, and the headphones of the
method described in FIG. 2 are not required. Conference participants 201, 202 speak language A,
and conference participants 203, 204 speak language B. The interpreter 205 listens to the
language B and translates it into the language A. The interpreter 206 listens to the language A
and translates it into the language B. The signal from the microphone 207 enters the space
division simultaneous broadcast apparatus 501 of the present invention, amplitude modulates
the ultrasonic local signal, and is sent out from the ultrasonic transducers 503 and 504. The
arrival areas of the ultrasonic waves transmitted from the ultrasonic transducers 503 and 504
are areas 507 and 508. The signal from the microphone 208 enters the space division
simultaneous broadcast apparatus 501 of the present invention, amplitude modulates the
ultrasonic local signal, and is transmitted from the ultrasonic transducers 505 and 506. The
arrival areas of the ultrasonic waves transmitted from the ultrasonic transducers 505 and 506
are areas 509 and 510.
[0014]
FIG. 6 shows a block diagram of the space division simultaneous broadcasting apparatus 501. As
shown in FIG. The ultrasound local signal, which is the output of the ultrasound generator 607, is
applied to the modulators 602, 605. The modulator 602 amplitude-modulates the ultrasonic
local signal at the output of the ultrasonic oscillator 607 with the audio signal captured by the
microphone 207 and amplified by the amplifier 601. The modulator 605 amplitude-modulates
the ultrasonic local signal from the ultrasonic generator 607 with the audio signal captured by
the microphone 208 and amplified by the amplifier 604. The output of the modulator 602 is
amplified by an amplifier 603 to drive an ultrasonic transducer 503 and an ultrasonic transducer
504. The output of modulator 605 is amplified by amplifier 606 to drive ultrasonic transducer
505 and ultrasonic transducer 506.
[0015]
In FIG. 5, when a conference participant 201 or 202 speaks in language A, interpreter 206
translates into language B immediately. The translated voice is converted into an electrical signal
by the microphone 208, amplified by the amplifier 604, applied to the modulator 605, and
amplitude-modulates the ultrasound local signal from the ultrasound generator 607. The output
of modulator 605 is amplified by amplifier 606 to drive ultrasonic transducers 505 and 506. The
ultrasonic transducer 505 transmits the amplitude-modulated ultrasonic wave into the air, and is
detected by air non-linearity in the area 509, and the conference participant 203 can listen to the
speech of the language B translated by the interpreter 206 it can. The ultrasonic transducer 506
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transmits amplitude-modulated ultrasonic waves into the air, and is detected by air non-linearity
in the range of the area 510 so that the conference participant 204 can listen to the speech of
the language B translated by the interpreter 206 it can.
[0016]
On the other hand, when the conference participant 203 or 204 speaks in language B, the
interpreter 205 translates into language A immediately. The translated voice is converted into an
electrical signal by the microphone 207, amplified by the amplifier 601, applied to the modulator
602, and amplitude-modulates the ultrasonic local signal from the ultrasonic oscillator 607. The
output of modulator 602 is amplified by amplifier 603 to drive ultrasonic transducers 503 and
504. The ultrasonic transducer 503 transmits an amplitude-modulated ultrasonic wave into the
air, and is detected by air non-linearity in the area of the area 507, and the conference
participant 201 can listen to the speech of the language A translated by the interpreter 205 it
can. The ultrasonic transducer 504 transmits amplitude-modulated ultrasonic waves into the air,
and the area of the area 508 is detected by air nonlinearity so that the conference participant
202 can listen to the speech of the language A translated by the interpreter 205. .
[0017]
As shown in FIG. 5, the ultrasound signal delivery area 507 of the ultrasound transducer 503 is
directed to the conference participant 201, and the ultrasound signal delivery area 508 of the
ultrasound transducer 504 is directed to the conference participant 202 . The size of the
ultrasonic wave arrival area can be changed by the variable resistor 608. That is, when the
variable resistor 608 is adjusted and the oscillation frequency of the output of the ultrasonic
oscillator 607 is increased, the areas 507, 508, 509, and 510 become smaller, and when the
oscillation frequency of the output of the ultrasonic oscillator 607 is decreased, the area 507,
508, 509, 510 become wider. If the areas 507 and 508 and the areas 509 and 510 do not
overlap, the conference participants 201 and 202 do not listen to the speech of the language B
translated by the interpreter 206, and the conference participants 203 and 204 do not interpret
the interpreter 205. I do not listen to the voice of the translated language A. In addition, although
one ultrasonic transducer is made to correspond to one conference participant in FIG. 5, it is
needless to say that a plurality of conference participants may exist in the output area of one
ultrasonic transducer. If the number of participants in the conference is small, it may be
necessary to provide only one ultrasonic transducer instead of installing two ultrasonic
transducers 503 and 504.
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[0018]
FIG. 7 is a block diagram showing another example of application of the present invention to the
international conference shown in FIG. 5, in which space division simultaneous broadcasting is
performed from the microphones 207 and 208 for converting translated words of the
interpreters 205 and 206 into electric signals. The line up to the device 501 is a wireless line to
avoid the complexity of the wiring. The transmitters 701 and 702 transmit voice signals of the
microphones 207 and 208 by radio waves. The receiving devices 703 and 704 are set to receive
the wireless transmission frequency of the transmitting device 701, receive the voice from the
microphone 207, modulate the ultrasonic waves, and send them to space. The arrival area of the
ultrasonic wave sent out by the reception device 703 is the area 707, and the arrival area of the
ultrasonic waves sent out by the reception device 704 is the area 708. The receiving devices 705
and 706 are set to receive the wireless transmission frequency of the transmitting device 702,
receive the sound from the microphone 208, modulate the ultrasonic waves, and transmit them
to space. The arrival area of the ultrasonic wave transmitted by the receiving apparatus 705 is
the area 709, and the arrival area of the ultrasonic wave transmitted by the receiving apparatus
706 is the area 710.
[0019]
FIG. 8 is a block diagram of the transmission apparatus, which is connected to the microphone
207 assuming the transmission apparatus 701. The electric signal from the microphone 207 is
converted to a radio frequency by the wireless transmitter 802 and transmitted from the antenna
801. The configuration of the transmitting device 702 is also the same as that of the device of
FIG. 8, and only the wireless transmission frequency is different from that of the transmitting
device 701. FIG. 9 is a block diagram of a receiver. Although the figure is described as the
receiver 703, the receiver 704 is exactly the same. The block diagrams of the receiving devices
705 and 706 are the same as the receiving devices 703 and 704, but the radio receiving
frequency is different from that of the receiving devices 703 and 704. That is, the reception
frequency of the wireless receiver in the reception devices 703 and 704 corresponds to the
transmission frequency of the wireless transmitter in the transmission device 701, and the
reception frequency of the wireless receiver in the reception devices 705 and 706 is the same as
that of the transmission device 702. It corresponds to the transmission frequency of the wireless
transmitter. The wireless signal from the antenna 901 is received by the wireless receiver 902,
and the voice signal is demodulated. This audio signal is amplitude modulated in the modulator
903 by the modulator 903 and amplified by the amplifier 904 and sent out from the ultrasound
transducer 905 to space. The oscillation frequency of the ultrasonic oscillator 906 can be
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adjusted by a variable resistor 907.
[0020]
When the conference participant 203 or 204 speaks the language B, the interpreter 205
translates to the language A immediately. The translated voice is converted to an electrical signal
by the microphone 207 and joins the wireless transmitter 802. The wireless transmitter 802
modulates a radio frequency with speech of language A and transmits it from the antenna 801.
The wireless output transmitted from the antenna 801 is received by the receivers 703 and 704.
Now, assuming that the block diagram of FIG. 9 is each block of the reception device 703, the
output from the antenna 801 is received by the wireless receiver 902 via the antenna 901, and
the voice from the microphone 207 is demodulated. The modulator 903 amplitude-modulates the
ultrasonic local signal from the ultrasonic oscillator at the output of the wireless receiver 902,
amplifies it by the amplifier 904, and sends it out to the space from the ultrasonic transducer
905. The amplitude-modulated ultrasonic wave transmitted from the ultrasonic transducer 905
is envelope-detected by the non-linearity of air, and the conference participant 201 in the area
707 can listen to the content translated by the interpreter 205. Similarly, the ultrasonic wave
transmitted from the ultrasonic transducer of the receiver 704 is envelope-detected by the nonlinearity of air, and the conference participants 202 in the area 708 can also listen to the
contents translated by the interpreter 205. The size of the area 707 is adjusted by changing the
frequency of the ultrasonic local signal of the ultrasonic generator 906 by the variable resistor
907. On the other hand, when the conference participants 201 and 202 speak the language A,
the interpreter 206 translates to the language B, the translated voice is converted into an electric
signal by the microphone 208, and is transmitted from the transmitting device 702 as a radio
wave. The transmitted radio waves are received and demodulated by the receiving devices 705
and 706, amplitude modulate the ultrasonic waves, and are sent out from the ultrasonic
transducers into space. The ultrasound transmitted from the ultrasound transducer is envelopedetected by the non-linearity of air, and the translated speech of the interpreter 206 will be
heard by the conference participants. That is, the conference participant 203 can listen to the
translation of the interpreter 206 by being in the ultrasonic wave arrival area 709 of the
ultrasonic transducer of the receiving device 705, and the conference participant 204 can be an
ultrasonic transducer of the ultrasonic transducer of the receiving device 706. The translation of
the interpreter 206 can be heard by being within the reach area 710 of the In the present
embodiment, in the case of an international conference, etc., the wiring from the microphone to
the modulator is not necessary, and installation becomes extremely easy.
[0021]
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According to the present invention, by using ultrasonic waves, broadcasts of different contents
can be simultaneously sent out to spatially divided areas, and rooms are divided according to the
contents of broadcast as in the prior art, or divided by walls. Also, there is no need to lower the
volume of each speaker, which saves space, saves the cost of materials for walls and rooms, and
saves preparation costs. In addition, when used for an international conference, etc., it is not
necessary to use headphones, and it is possible to save the trouble and inconvenience of putting
on the headphones of the conference participants.
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