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DESCRIPTION JP2003116192

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DESCRIPTION JP2003116192
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus having an image recognition function, and more particularly to a superdirective
audio apparatus and program with significantly improved directivity.
[0002]
2. Description of the Related Art Conventionally, as a speaker device, one configured to vibrate a
diaphragm and to listen to sound emitted from the diaphragm into the air has been widely used.
This type of speaker device vibrates a diaphragm by an audio signal of an audible frequency
range of about 20 Hz to 20 KHz, and emits sound directly from the diaphragm into air.
[0003]
In these speaker devices, the sound is emitted with a spread in the air around the diaphragm and
can not emit the sound only to a specific listener. Therefore, there has been provided a speaker
device capable of emitting sound using an ultrasonic vibration element with a confidential
function.
[0004]
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By the way, a speaker device that emits sound only to a specific listener can emit sound with
superdirectivity. This type of speaker device is useful when the listener is at a particular location.
[0005]
However, in this type of speaker device, a plurality of listeners aligned in a straight line prior to
the directivity show the audible sound, and the secrecy is low. In addition, when the vibrator is
fixed, the sound can not be emitted toward the position of the moving listener.
[0006]
Therefore, it is an object of the present invention to use a novel listening position setting method
and a new sound source position setting method to emit sound with superdirectivity so that only
a listener at a specific position can hear it The present invention is to provide a superdirective
acoustic device.
[0007]
SUMMARY OF THE INVENTION The superdirective acoustic device according to the present
invention proposed to achieve the above-mentioned object is characterized in that the audio
signal outputted from the sound source is at least higher than the audible band by the
modulation means. The signal is frequency-modulated to a signal in the frequency domain, and
the ultrasonic transducer is driven by the frequency-modulated signal from the modulation
means.
At the same time, an image recognition device equipped with a camera recognizes the position of
the listener and determines the direction of the sound wave emitted by the ultrasonic transducer,
thereby matching the area for transmitting the audible sound to the position of the listener
Determined automatically. Furthermore, by changing the modulation frequency automatically,
the confidential speech function is enhanced by controlling the audible sound propagation area.
[0008]
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DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described based on the drawings. FIG. 1 shows a schematic view of the arrangement of a
system according to an embodiment of the present invention.
[0009]
In FIG. 1, 1 is an information processing apparatus comprising an AV personal computer, 2 is an
agent character, 3 and 5 are image input devices, 6 and 7 are ultrasonic transducers, 8 and 9 are
angle control devices, For the listener 10 of the present system, they are respectively arranged as
shown so as to constitute channels L and R. Further, 11 indicates a wireless microphone.
[0010]
FIG. 2 shows a block diagram of an essential part of one embodiment of the present invention. In
FIG. 2, the image input device 3 constituting the channel L, the ultrasonic transducer 6, the angle
control device 8, and the image input device 5 constituting the channel R, the ultrasonic
transducer 7 and the angle control device 9 The information processing units 13 of the device 1
are connected to each other. Further, the storage unit 14 is connected to the information
processing unit 13. The storage unit 14 stores in advance registered image data for listener
recognition, a processing program of the present system, and the like.
[0011]
FIG. 3 shows a flow chart showing the operation of one embodiment of the present invention,
FIG. 4 shows a more detailed flow chart of step S3 of FIG. 3, and FIG. 5 shows a more detailed
flow chart of step S4 of FIG. .
[0012]
Processing programs corresponding to these flowcharts are stored in the storage unit 14.
The characteristic operation of an embodiment of the present invention in such a configuration
will be described. First, initialization of the system is performed in step S2 of FIG. 3 (hereinafter
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simply referred to as “step S2”), and the angles of the ultrasonic transducers 6 and 7 and the
image input devices 3 and 5 are set in advance.
[0013]
The listener 10 operates the information processing apparatus 1 by performing voice input to
the agent character 2 of the information processing apparatus 1 via the wireless microphone 11.
When the listener 10 is not in front of the information processing device 1, the angle control
device 8 and the angle control device 9 include the image input device 3, the ultrasonic
transducer 6 and the image input device 5, and the ultrasonic transducer 7. Fix at the initially set
angle.
[0014]
When the listener 10 enters the fixed audible sound radiation area, the information processing
apparatus 1 executes a target capturing step of recognizing the listener and confirming whether
it is a listener registered in advance (step S3). .
[0015]
Specifically, the information processing unit 13 calls the registered face image data of the
listener 10 stored in advance in the storage unit 14 (step S7).
Furthermore, as shown in FIG. 6, the channel L image 16 and the channel R image 17 of the
listener 10 are respectively input to the information processing apparatus 1 from the image
input device 3 and the image input device 5. And the image 19 is stored. When it is determined
that the face image data of the listener 10 stored in advance and the images of the image 18 and
the image 19 stored are similar, it is recognized that the listener is in front of the information
processing device 1 ( Step S8). After listener recognition, from each of the images 18 and 19, the
details of the contour of the face are recognized and compared with the details of the face image
of the registered listener 10 to confirm whether it is the registered listener 10 or not. (Step S9).
[0016]
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If it is determined that the listener is not a pre-registered listener, radiation of ultrasonic waves
from the ultrasonic transducers 6 and 7 is not performed, and steps S7 to S9 are repeated until a
registered listener appears. If the listener is a registered listener, tracking of the listener is
started (step S10, step S4).
[0017]
When the listener 10 is a listener registered in advance, the information processing unit 13
recognizes the head of the listener from the input image data from the image input devices 3 and
5, and the information processing unit 13 recognizes the listener's head from the ultrasound
radiation area. The offset is recognized as a deviation from the image center of the listener's head
(step S13), and the angles of the image input devices 3 and 5 are adjusted by, for example, angle
control devices 8 and 9 equipped with an angle control mechanism by a stepping motor. The
listener's head is adjusted to be positioned at the center of the images of the image input devices
3 and 5 (step S14). The listener following operation is continuously performed when the listener
10 uses the information processing apparatus 1, and the listener 10 can listen to the ultrasound
at the center of the ultrasound radiation intersection area.
[0018]
Here, in this example, the audio signal output from the sound source is frequency-modulated to a
signal in a frequency range higher than at least the audible band by the modulation means, and
the ultrasonic transducers 6 and 7 are frequency-modulated signals from the modulation means.
Drive.
[0019]
At this time, for example, when the registered listener is an elderly person, by raising the sound
pressure level, it is possible to allow the listener to reach the voice without leaking the sound to
the surroundings.
Alternatively, at this time, for example, by radiating the music registered by the registered
listener, the registered music can be delivered to the listener without leaking the sound to the
surroundings.
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[0020]
This state is shown in FIG. In FIG. 7, reference numeral 21 denotes an ultrasonic radiation
intersection area, 22 denotes an R channel radiation area from the ultrasonic transducer 7, and
23 denotes an L channel radiation area from the ultrasonic vibration 6.
[0021]
FIG. 8 shows an explanatory view of the confidential speech function according to the present
invention. The crossover region 25 between the sound wave 23 radiated from the ultrasonic
transducer 7 and the sound wave 24 radiated from the ultrasonic transducer 6 can be heard by
the listener 10 but can not be heard by the listener 26. This indicates that it inhibits the
possibility of being heard by anyone other than a specific listener.
[0022]
FIG. 9 shows an explanatory view of a confidential speech function by the conventional device. A
plurality of listeners, for example, a listener 33 and a listener 34, can be present at the
intersection region 32 of the sound waves radiated from the ultrasonic transducer 30 and the
ultrasonic transducer 31, and are heard by others than the specific listener.
[0023]
According to the speaker apparatus of the present invention, since the listener follows the
listener, the listener does not care about the listening position and does not care about the noise
to the surroundings, and it is possible to use the high secrecy function. Listening can be obtained.
[0024]
Furthermore, since the speaker device according to the present invention recognizes the listener,
it is possible to obtain an audible sound by the high secrecy function.
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