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DESCRIPTION JP2004147268

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DESCRIPTION JP2004147268
[PROBLEMS] Since an acoustic signal is amplitude-modulated and emitted as an ultrasonic wave
in an ultrasonic band and the acoustic signal is generated on radiation and can not be generated
only at an arbitrary spatial point, using an ultrasonic wave The direction of the radiation for
reproducing the acoustic signal can not be specified and set in real time based on the external
signal. An acoustic signal is amplitude-modulated and carrier-suppressed one sideband signal or
both sides by utilizing generation of an acoustic signal due to non-linearity when an ultrasonic
signal propagates in air. A means for generating sound as a component signal of the frequency
difference by emitting and crossing an ultrasonic wave emitted as an ultrasonic wave, which is an
ultrasonic wave signal as a wave band signal, and an ultrasonic wave of a single frequency; The
method is characterized in that the crossing point of the ultrasonic waves can be changed to an
arbitrary position in real time on the basis of the sound generation position signal input from.
[Selected figure] Figure 1
Sound generation method and apparatus by multiple ultrasonic radiation with automatic
radiation direction setting
BACKGROUND OF THE INVENTION Ultrasonic radiation signals are created based on acoustic
signals input from the outside, and ultrasonic radiation direction is automatically radiated in real
time based on acoustic generation position signals input from the outside. The present invention
relates to an ultrasonic radiation method and apparatus for setting an angle and emitting
ultrasonic radiation signals as ultrasonic waves to generate sound at an acoustic generation
position. Conventionally, in the case of using one ultrasonic radiation apparatus, an ultrasonic
wave in which an acoustic signal is amplitude-modulated is emitted to generate an acoustic wave
on the radiation, and it is generated on other than the radiation. Since there is an advantage that
it can be heard in a limited place, it is used when, for example, sound is transmitted to an
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arbitrary point in a noisy place such as a construction site due to noise. Alternatively, in the case
of using a plurality of ultrasonic radiation devices, a plurality of signals obtained by amplitudemodulating an acoustic signal are emitted and crossed to generate a large acoustic signal at the
intersection point. However, in the case of using a conventional ultrasonic radiator, sound is
generated on radiation, and people on the radiation can hear the sound, and can not hear it at
any point. was there. Moreover, even when using a plurality of conventional ultrasonic radiators,
not only the sound is generated at the crossover point but also a small sound is generated on
each radiation, and there is a problem that people on the radiation can hear the sound. The Also,
in either case, it was impossible to change the sound generation position in the ral- lar time.
SUMMARY OF THE INVENTION The problem to be solved by the present invention is that,
conventionally, an acoustic signal is generated on the radiation of ultrasonic waves and can not
be generated only at an arbitrary spatial point. Also, conventionally, the direction of radiation for
generating sound using ultrasonic waves can not be specified and set in real time based on an
external signal. SUMMARY OF THE INVENTION The present invention uses the fact that an
acoustic signal is generated due to non-linearity in the case where an ultrasonic signal
propagates in the air, thereby amplitudeing the acoustic signal. The frequency difference
between the ultrasonic waves emitted as ultrasonic waves that are modulated and carriersuppressed single sideband signals or double sideband signals as ultrasonic waves and the
ultrasonic waves of a single frequency and their frequency difference The present invention is
characterized in the means for generating sound at the crossover point as the component signal
of the above, and means for making it possible to change the crossing point of the ultrasonic
waves to an arbitrary position in real time based on the sound generation position signal inputted
from the outside. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When two
ultrasounds of close frequency cross each other, the sound of the frequency of the frequency
difference is generated in proportion to the product of the two ultrasonic powers.
Therefore, the ultrasonic wave of the single sideband signal obtained by amplitude-modulating
the acoustic signal in the ultrasonic band and suppressing the carrier wave does not generate a
large sound on the radiation because the non-linearity does not generate a power component
with a large frequency difference. The purpose of generating sound from ultrasonic waves only
at arbitrary positions is as follows: Amplitude-modulating an acoustic signal into an ultrasonic
band and emitting a carrier-suppressed ultrasonic wave and a single-frequency ultrasonic wave
such as a carrier wave By generating the crossing point sound, it was realized without generating
the sound except the crossing point. In addition, the purpose of changing the acoustic generation
position based on the acoustic generation position signal input from the outside in the reellal
time, the ultrasonic emission position in real time based on the acoustic generation position
signal input from the outside with the acoustic generation position as the ultrasonic crossover
position Calculates the direction and outputs it to the ultrasonic emitter, so that the acoustic
signal is amplitude modulated in the ultrasonic band and the carrier wave suppressed ultrasonic
emitter radiation direction and the ultrasonic emitter radiation of the single frequency ultrasonic
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wave. It realized by changing the direction and the ultrasonic intersection. FIG. 1 is a block
diagram of an apparatus according to an embodiment of the present invention. In FIG. 1, an
amplitude modulator 220 amplitude-modulates an acoustic signal 12 externally inputted in real
time into an ultrasonic frequency band and carries out carrier suppression of the single sideband
signal as an ultrasonic radiation signal 121. Also, a sine wave signal, which is a carrier signal
used for amplitude modulation, is sent to the ultrasonic radiator 230 as an ultrasonic radiation
signal 122. The radiation angle calculator 210 calculates an ultrasonic radiation direction signal
111 indicating the vertical and horizontal angles to be radiated by the ultrasonic radiator 240
based on the sound generation position signal 11 which is variably input from the outside in real
time. At the same time, an ultrasonic radiation direction signal 112 is calculated and sent to the
ultrasonic radiator 230. The ultrasonic radiation direction signal 112 indicates the vertical and
horizontal angle at which the ultrasonic radiator 230 should emit. The ultrasonic emitter 240
sets the upper, lower, left, and right radiation angles based on the ultrasonic radiation direction
signal 111 to emit ultrasonic waves 141 based on the ultrasonic radiation signal 121, and at the
same time, the ultrasonic emitter 230 performs ultrasonic radiation. An ultrasonic wave 131 is
emitted based on the ultrasonic radiation signal 122 by setting the vertical and horizontal angles
based on the direction signal 112, and these two emitted ultrasonic waves 131 and 141 cross at
the intersection point 250, and at this intersection point The signal obtained by adding the two
ultrasonic waves 131 and 141 generates sound by non-linearity. The ultrasonic radiation signal
122 is also preferably a carrier signal used for amplitude modulation, but a sinusoidal signal
having a frequency close to that of the carrier signal can also be used.
The ultrasonic radiators 240 and 230 set the upper, lower, left, and right radiation angles based
on the ultrasonic radiation direction signal 111, but the upper, lower, left, and right radiation
angles are set by physically changing the direction of the ultrasonic radiators. It is possible to set
a number of small ultrasonic emitters in advance to several angles in one ultrasonic emitter, and
emit some of them in combination to set the upper, lower, left, and right radiation angles. You
can also In the present invention, any method may be used to change the direction of ultrasonic
radiation as a result. The calculation of the radiation angle of the radiation angle calculator 210
is performed by setting the three-dimensional coordinate axes of the space to be radiated, and
first obtaining the coordinate position of each of the ultrasonic radiators 240 and 230 therein. A
straight line connecting these two positions is determined from the sound generation position
coordinates specified by the sound generation position signal 11 and the coordinate position of
the ultrasonic radiator 240, and the vertical and horizontal angles from the ultrasonic radiator
240 of the straight line are As a result, an ultrasonic radiation direction signal 111 is obtained.
Similarly, the ultrasonic radiation direction signal 112 can be obtained from the sound
generation position coordinates and the coordinate position of the ultrasonic radiation device
230, and the calculation is mathematically easy. Although the present invention shown in FIG. 1
uses two ultrasonic emitters, a large number (three or more) of ultrasonic emitters are used to
combine them to form a plurality of ultrasonic crossover points. Sound can also be generated at
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these ultrasonic crossover points. Although the present invention described above uses the
single-sideband signal obtained by amplitude-modulating the acoustic signal 12 externally input
in real time to the ultrasonic frequency band and suppressing the carrier as the ultrasonic
radiation signal 121, the carrier suppression It is also possible to use double sideband signals. As
described above, according to the present invention, sound is not generated except at the
crossover point of ultrasonic waves, and sound is generated only at the crossover point of
ultrasonic waves, and the crossover point of ultrasonic waves is determined. It can be set and
moved in real time, and the sound generation position can be moved and used in space in real
time using this. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an
apparatus according to an embodiment of the present invention. [Explanation of the code] 11 is
an acoustic generation position signal inputted from the outside, 12 is an acoustic signal inputted
from the outside, 111 and 112 are ultrasonic radiation direction signals, 121, 122 are ultrasonic
radiation signals, 131 and 141 is an ultrasonic wave, 210 is a radiation angle calculator, 220 is
an amplitude modulator, 230 and 240 are ultrasonic emitters, and 250 is an ultrasonic crossover
point and an acoustic generation point.
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