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JP2007235792

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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 JP2007235792
The present invention provides a television system in which a viewer can view a television
without worrying about annoyance of sound leakage to the surroundings. SOLUTION: An
ultrasonic signal modulated by an audio signal is emitted toward a bed from an ultrasonic
speaker built in a television, and an audio signal contained in the ultrasonic signal is laid on the
bed and is a bed former of a viewer lying on the bed. A television system that allows the viewer
to listen to the audio signal of the television, the television system being disposed at the top of
the bedside of the bed and reflecting the ultrasound signal from the television in the direction of
the bedside bedside A television system comprising: a sound field forming device for reproducing
a television audio signal at a bedside bedside. [Selected figure] Figure 1
Television system and television audio listening method
[0001]
The present invention relates to a television system and a television audio listening method,
which allow a hospitalized patient to view television (also simply referred to as "television")
without worrying about the inconvenience of sound leakage to the surroundings.
[0002]
At present, since the television generally installed in the patient's room is a television with a builtin ordinary loudspeaker, it is necessary to care for the patient admitted to the time zone or the
same room, and the patient who watches the television The volume was lowered or the
earphones were used to prevent the sound from leaking around.
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[0003]
Also, in general, patients often watch TV while lying in bed, in which case earphones are
essential.
Therefore, if you use the earphone for a long time, it may cause pain in the ear, or if you change
the direction of the body with the earphone inserted in the ear, the lead wire of the earphone
may be in the way, or it may be inserted in the opposite ear There were a lot of troubles.
[0004]
Therefore, acoustic devices and televisions using ultrasonic speakers have been proposed, which
make it possible to reduce the sound leakage to the surroundings so as not to disturb the
surroundings.
For example, there is a prior art sound device and a control method of the sound device (see
Patent Document 1).
[0005]
In this prior art sound device and control method of the sound device, the direction of the remote
commander is detected by the remote control signal from the remote commander, and the
directivity of the speaker by the ultrasonic wave is changed in the direction of the remote
commander. We have provided televisions, various audio devices, and the like that have reduced
the leakage of sound to make it possible to form an appropriate sound field using speakers.
[0006]
However, in this prior art configuration, the sound field is formed while maintaining the strong
directivity of the ultrasonic wave, so whenever the viewer changes the location or changes the
posture, the remote commander of the speaker I have to fix the direction, which is very
troublesome.
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In addition, ultrasonic waves are easily reflected if they are made of a relatively hard material, so
if there is a wall or an object that easily reflects ultrasonic waves on the back, the sound will be
diffusely reflected, resulting in inconvenience around the surroundings. . JP 2005-295411 A
[0007]
As described above, in the acoustic device and the control method of the acoustic device
according to the prior art, the sound field is formed while maintaining the strong directivity of
the ultrasonic wave, so every time the viewer changes the location or changes the posture, The
remote control by the remote commander had to be corrected for the direction of the speaker,
which was very troublesome. In addition, ultrasonic waves are easily reflected if they are made of
a relatively hard material, so if there is a wall or an object that easily reflects ultrasonic waves on
the back, the sound will be diffusely reflected, resulting in a problem of causing inconvenience
around the environment. there were.
[0008]
The present invention has been made to solve such a problem, and it is an object of the present
invention that when a television is equipped with a directional speaker (ultrasonic speaker), a
hospitalized patient is worried about the annoyance of sound leakage to the surroundings. It is an
object of the present invention to provide a television system and a method for listening to a
television sound, which can watch a television while lying on a bed or in a state of being awake
(in a reclining state).
[0009]
The present invention has been made to solve the above-mentioned problems, and the television
system of the present invention radiates an ultrasonic signal modulated by an audio signal to a
bed from an ultrasonic speaker built into the television. A television system that reproduces an
audio signal included in the ultrasonic signal in the vicinity of the bedside of a viewer lying on a
bed, and allows the viewer to listen to the sound of a television, and is disposed above the
bedside of the bed A sound field forming device for reflecting an ultrasonic signal from the
television toward the bedside of the bed and reproducing an audio signal of the television at the
bedside of the bed.
In a television system having such a configuration, an ultrasonic signal emitted from an
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ultrasonic speaker built in the television is reflected by a sound field forming device installed at
the top of the bedside bedside, and the sound included in the ultrasonic signal The signal is
played near the bedside of the viewer lying on the bed. Thus, the hospitalized patient can watch
the television while lying on the bed or in a half-worn state (reclining state) without worrying
about the inconvenience of sound leakage to the surroundings.
[0010]
The television system of the present invention is characterized in that the reflecting surface of
the sound field forming device is formed into an elliptically curved shape. With such a
configuration, the reflecting surface of the sound field forming device is formed into an
elliptically curved shape, whereby the directivity of the ultrasonic wave is weakened, and the
position of the viewer's head is reduced by giving some extent to the sound. Even if it changes, it
can be made not to change how the sound of the television is heard.
[0011]
Also, the television system of the present invention is characterized in that the reflecting surface
of the sound field forming device is formed to scatter ultrasonic signals. With such a
configuration, for example, by making the inner surface of the sound field generator a plurality of
planes, making the surface rough, or arranging a large number of fine irregularities and
hemispheres, etc., the sound wave is spread and auditionable Range extends. Thus, even if the
viewer moves his body slightly, he can listen to the sound of the television at the same volume.
[0012]
In the television system according to the present invention, the sound field formation device
further comprises a variable mechanism for changing the reflection surface of the ultrasonic
signal in the left and right direction and in the up and down direction. With such a configuration,
the reflecting surface of the sound field forming device can be changed to any direction and
angle, such as up, down, left, and right. Thereby, according to the installation position of a
television, direction of a sound field formation device can be adjusted appropriately. Therefore,
the television can be arranged parallel to the bed as well as near the foot of the bed.
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[0013]
In the television system according to the present invention, the sound field forming device
further includes a position detection transmitter for transmitting a position signal of the sound
field forming device itself to the television, and the television is configured to transmit the sound
field forming device. A position detection receiver for receiving a position signal from a position
detection transmitter of a forming unit; and an automatic movement mechanism for correcting
the direction of an ultrasonic speaker in accordance with a change in the position signal
transmitted from the sound field forming unit. It is characterized by having. With such a
configuration, the television receives the position signal from the position detection transmitter
of the sound field forming device, and corrects the direction of the ultrasonic speaker in
accordance with the change in the position signal transmitted from the sound field forming
device. Thereby, the direction of the ultrasonic speaker can be automatically corrected in
accordance with the position of the sound field forming device.
[0014]
Further, according to the television audio listening method of the present invention, an ultrasonic
signal modulated by an audio signal is emitted toward the bed from an ultrasonic speaker built in
the television, and the audio signal included in the ultrasonic signal is emitted to the bed. A
method for listening to television sound in a television system, wherein the sound field is
reproduced in the vicinity of the bedside of a viewer lying on top of the bed and the viewer
listens to the sound of the television. And a procedure for arranging the ultrasonic signal from
the television in the direction of the bedside of the bed by the sound field formation device, and a
procedure for reproducing the audio signal of the television in the vicinity of the bedside of the
bed. It is characterized by including. According to such a method, the ultrasonic signal emitted
from the ultrasonic speaker built in the television is reflected by the sound field forming device
installed at the top of the bedside bedside, and the audio signal included in the ultrasonic signal
is on the bed Play in the vicinity of the bedside of the viewer lying down. Thus, the hospitalized
patient can watch the television while lying on the bed or in a half-worn state (reclining state)
without worrying about the inconvenience of sound leakage to the surroundings.
[0015]
Next, the best mode for carrying out the present invention will be described with reference to the
drawings. FIG. 1 is a diagram showing a configuration example of a television system according
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to the present invention. As shown in FIG. 1, the television system 1 of the present invention is
composed of a television 10 and a sound field forming device 20 provided in the bed 2.
[0016]
FIG. 2 shows an external view of a television body used in the television system of the present
invention. 2A shows a front view of the television, and FIG. 2B shows a side view of the television.
As shown in FIG. 2, the ultrasonic speaker 11 is built in the television 10, and it becomes a beamlike sound source with very strong directivity, and as shown by a dotted arrow A in FIG. 2 (B). A
sound wave is emitted (the structure and operation of the ultrasonic speaker will be described
later).
[0017]
Returning to FIG. 1, this ultrasonic speaker 11 is disposed slightly above the television 10 so that
the emitted ultrasonic waves are not blocked by part of the bed 2, bedding, chairs, etc. before
reaching the viewer. It is good to do.
[0018]
Further, a position detection receiver 12 is provided above the ultrasonic speaker 11 of the
television 10, and a position signal from the position detection transmitter 21 provided in the
sound field forming unit 20 mounted above the bed is used as a base. Then, the direction of the
ultrasonic speaker 11 is adjusted by the automatic phase shift mechanism 13 so that the sound
wave is emitted to the optimum reflection spot of the sound field forming device 20.
[0019]
The position detection transmitter 21 transmits, for example, a signal of infrared light.
In the position detection receiver 12, for example, the direction of the position detection
transmitter 21 can be determined by arranging a plurality of infrared sensors in an arc shape
and comparing the reception intensity of each infrared sensor.
Further, in the position detection receiver 12, for example, by arranging a plurality of infrared
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sensors in a curved shape or the like in a planar manner and comparing the reception intensity
of each infrared sensor, both the direction of the position detection transmitter 21 and the angle
Can be detected.
[0020]
In addition, the sound field forming device 20 has a curved shape, and is fixed to the vertical
plate or frame of the head of the main body of the bed 2 through a variable mechanism 22 for
freely changing the angle and the direction. The sound field forming device 2 may be fixed to a
wall or the like above the head of the viewer instead of a part of the main body of the bed 2.
[0021]
With such a configuration, the sound field forming device 20 can be arbitrarily oriented
according to the position of the viewer's ear and the position of the television 10. Demodulated
sound (sound from the television) from the ultrasonic waves reflected by the sound field forming
unit 20 comes down from the upper part somewhat backward toward the bedside. Further, since
the sound wave containing the ultrasonic component is almost completely absorbed by the
clothes and bedding of the viewer, the sound is not irregularly reflected and leaks to the
surroundings.
[0022]
FIG. 3 is a diagram showing an example of the configuration when the bed is in the reclining
state. In the example shown in FIG. 3, the other structure except the state of the bed 2 is the
same as FIG. If the sound field formation device 20 is disposed above the viewer's head, the
television 10 is displayed in the same state as FIG. 1 only by adjusting the direction and angle of
the sound field formation device 20 as necessary. You can watch it.
[0023]
In the example shown in FIGS. 1 and 3, the television 10 is installed near the foot on the same
straight line as the bed 2, but even when the television 10 is installed parallel to the bed 2, the
sound field forming device 20 is installed. By adjusting the direction and angle of the angle to
match the direction of the television 10, the television 10 can be viewed in the same state as
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described above.
[0024]
Here, when the television 10 is installed parallel to the bed 2, it is necessary to largely correct the
direction of the sound field forming device 20.
In this case, the position detection receiver 12 provided in the television detects the direction of
the sound field former 20 based on the signal of the position detection transmitter 21 provided
in the sound field former 20, and By driving and controlling the automatic movement mechanism
13, the direction of the ultrasonic speaker 11 is automatically corrected.
[0025]
FIG. 4 is a view showing a configuration example of a sound field forming device. Fig. 4 (A) shows
the front, and Fig. 4 (B) shows the external appearance seen from the side. The sound field
forming unit 20 has an elliptically curved shape in order to collect sound waves received from
the ultrasonic speaker 11 as efficiently as possible and to prevent the sound from being scattered
around. The inner surface (sound receiving surface) of the sound field generator 20 may be a
smooth surface, but the directivity of the ultrasonic wave may be weakened to make the sound
have a certain degree of spread, so that the position of the viewer's head Even if it changes, it is
good to set it as the structure which a change does not appear easily in how to hear.
[0026]
For example, by making the inner surface of the sound field forming device 20 rough, disposing a
large number of fine asperities or hemispheres, etc., the sound wave spreads, and the auditable
range expands. By this, even if the viewer moves his body slightly, he can hear the sound of the
television at the same volume.
[0027]
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Also, the sound wave comes down from above the viewer. That is, since the sound waves are
directed to the viewer's clothes, bedding, etc., because the material hardly reflects ultrasonic
waves, the sound is scattered around even if the sound field spreads due to the processing of the
inner surface of the elliptical curved surface shown earlier. There is nothing to do.
[0028]
Further, the sound field forming device 20 has a structure that can be changed in any direction
and angle in the vertical and horizontal directions by the variable mechanism 22 and the support
portion 23. The variable mechanism 22 is a sphere embedded in the support 23 a little deeper
than half, and the direction can be changed in all directions within 360 degrees and the angle
also within at least ± 70 degrees.
[0029]
In the sound field formation device 20 described above, the support portion 23 is directly fixed
to the head vertical plate or frame of the bed main body, but a method of fixing to the bed or the
nearby wall via the articulated arm is described. It is possible to change to any angle by using.
[0030]
FIG. 5 is a diagram showing a configuration example of an automatic movement mechanism of an
ultrasonic speaker in a television.
FIG. 5 shows an example of an electromagnetic actuator system as an example of the ultrasonic
transducer moving mechanism, and shows a central cross section of the automatic moving
mechanism 13 of the ultrasonic transducer.
[0031]
The ultrasonic speaker has an ultrasonic transducer 31 for emitting ultrasonic waves. The
ultrasonic transducer 31 is housed in a spherical holder 32 made of nonmagnetic material, and a
small piece of soft magnetism is formed at the center of the back of the holder. A magnetic plate
33 which is a material is embedded. The back of the holder 32 is provided with a magnetizing
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device 34 capable of magnetizing a desired position at a predetermined interval.
[0032]
Therefore, when it is desired to rotate the ultrasonic transducer 31 in the direction of the arrow
A and change it to a specific direction, the magnetic plate 33 embedded in the holder 32 is
attracted by moving the magnetizing position by the magnetizing device 34. To the desired
position.
[0033]
FIG. 5 (B) is an example in which the ultrasonic transducer 31 is rotated 45 degrees left and held,
and FIG. 5 (C) is an example in which the ultrasonic transducer 31 is held at the center position,
FIG. 5 (D) Shows an example in which the ultrasonic transducer 31 is rotated 45 degrees right
and held.
[0034]
The automatic movement mechanism 13 shown in FIG. 5 is an example of an electromagnetic
actuator system using the magnetic plate 33 and the magnetizing device 34, but may be a
mechanism using a motor and a gear.
Further, in FIG. 5, the ultrasonic transducer 31 is shown in FIG. 5 only in the example of rotating
only in the direction of the arrow A, but the ultrasonic transducer 31 is not only in the direction
of the arrow A but also a direction perpendicular to the sheet It is also easy to use a mechanism
that can rotate.
[0035]
FIG. 6 is a block diagram showing the overall configuration of the television system of the
present invention.
The sound field formation device 20 is provided with a position detection transmitter 21, and is
attached to a bed or the like by a support 23 via a variable mechanism 22.
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[0036]
In the television 10, only the part directly related to the present invention is shown, and the
reception circuit of the television itself, the detection and demodulation of video and audio
signals, the reproduction circuit, the video display unit and the like are omitted. The control unit
14 in the television 10 is constituted by a CPU or the like, and integrally controls the position
detection receiver 12, the sound field formation device position determination unit 15, the
ultrasonic speaker position control unit 16, the automatic movement mechanism 13, and the like.
[0037]
The position detection receiver 12 receives a position signal from the position detection
transmitter 21 of the sound field forming device 20 by infrared light or the like. The sound field
formation device position determination unit 15 receives the signal from the position detection
receiver 12 and performs processing of determining the position of the sound field formation
device 20. The ultrasonic speaker position control unit 16 controls the automatic movement
mechanism 13 based on the position signal of the sound field forming unit 20 received from the
sound field formation unit position determining unit 15. That is, the ultrasonic transducer 31 is
controlled by the automatic movement mechanism 13 so as to be directed to the direction of the
sound field forming device 20.
[0038]
FIG. 7 is a diagram for describing the configuration and operation of the electrostatic ultrasonic
transducer used in the ultrasonic speaker. FIG. 7A is a view showing a cross-sectional structure of
the electrostatic ultrasonic transducer. The electrostatic ultrasonic transducer shown in FIG. 7A is
held between a pair of fixed electrodes 40 and 41 including a conductive member formed of a
conductive material functioning as an electrode, and a pair of fixed electrodes 40 and 41, A
vibrating membrane 42 having a conductive layer (diaphragm electrode) 421, and a support
member 45 for holding the pair of fixed electrodes 40 and 41 and the vibrating membrane 42
are included.
[0039]
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The vibrating film 42 has an insulating layer 420 and a conductive layer 421 formed of a
conductive material, and the conductive layer 421 has either a single polarity (positive or
negative polarity) by the DC bias power supply 46. Or the like) may be applied.
[0040]
Further, the pair of fixed electrodes 40 and 41 have the same number and a plurality of through
holes 44 at the positions facing each other through the vibrating film 42, and between the
conductive members of the pair of fixed electrodes 40 and 41, the signal source 48A, An
alternating current signal is applied by 48B.
Capacitors are formed on the fixed electrode 40 and the conductive layer 421, and the fixed
electrode 41 and the conductive layer 421, respectively.
[0041]
In the above configuration, in the electrostatic ultrasonic transducer, a DC bias voltage of a single
polarity (positive in this example) is applied to the conductive layer 421 of the diaphragm 42 by
the DC bias power supply 46. On the other hand, an alternating current signal is applied to the
pair of fixed electrodes 40 and 41 by the signal sources 48A and 48B. As a result, in the positive
half cycle of the alternating current signal output from the signal sources 48A and 48B, a
positive voltage is applied to the fixed electrode 40, so the surface portion 43A of the vibrating
film 42 not held by the fixed electrodes is The electrostatic repulsion acts on the surface portion
43A, and the surface portion 43A is pulled downward in FIG. Further, at this time, since a
negative voltage is applied to the fixed electrode 41 opposed thereto, an electrostatic attractive
force acts on the back surface portion 43B which is the back surface side of the vibrating film 42,
and the back surface portion 43B is In FIG. 7, it is pulled further downward.
[0042]
Therefore, the film portion of the vibrating film 42 which is not held by the pair of fixed
electrodes 40 and 41 receives electrostatic repulsive force and electrostatic repulsive force in the
same direction. Similarly, for the negative half cycle of the alternating current signal output from
the signal sources 48A and 48B, the surface portion 43A of the vibrating membrane 42 has
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electrostatic attraction force upward in FIG. 7, and the back surface portion 43B. In FIG. 7, the
electrostatic repulsive force acts on the upper side in FIG. 7, and the film portion of the vibrating
film 42 not sandwiched by the pair of fixed electrodes 40 and 41 receives the electrostatic
repulsive force and the electrostatic repulsive force in the same direction. . In this manner, the
vibrating membrane 42 receives electrostatic repulsion and electrostatic repulsion in the same
direction according to the change in polarity of the alternating current signal, and the direction
in which the electrostatic force acts alternately changes, so that large membrane vibration, ie, An
acoustic signal of a sound pressure level sufficient to obtain a parametric array effect can be
generated.
[0043]
As described above, the ultrasonic transducer shown in FIG. 7 is called a Push-Pull type because
the vibrating membrane 42 vibrates by receiving force from the pair of fixed electrodes 40 and
41. Push-pull electrostatic ultrasonic transducers have the ability to simultaneously satisfy
broadband and high sound pressure, compared to pull-type electrostatic ultrasonic transducers
that only act on the vibrating film. have.
[0044]
As described above, in the push-pull type electrostatic ultrasonic transducer, a high voltage DC
bias voltage is applied to the vibrating film, and an alternating voltage is applied to the fixed
electrode, whereby the fixed electrode-vibration film is obtained. The membrane portion vibrates
due to the electrostatic force (attractive force and repulsive force) acting on the In this case, in
order to realize the vibration of the ultrasonic band, it is necessary to set the hole diameter of the
vibration portion to several mm or less. For example, as shown in FIG. By providing the vibration
hole 44, it is necessary to configure a transducer having a high tracking ability and a large
output.
[0045]
FIG. 8 is a view showing a configuration example of an ultrasonic speaker incorporated in a
television. As the ultrasonic transducer 31 of this ultrasonic speaker, a push-pull type
electrostatic ultrasonic transducer shown in FIG. 7 is used. The ultrasonic speaker AM modulates
the ultrasonic wave called carrier wave with the audio signal (audio frequency signal) of the
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television, and when this is released into the air, the original sound signal is self-reproduced in
the air due to air non-linearity. It is said that. That is, since the sound wave is a compressional
wave propagating through air as a medium, in the process of propagation of the modulated
ultrasonic wave, dense portions and sparse portions of air are prominently displayed, and the
dense portion has a high speed of sound and is sparse. As the speed of sound is slowed, the
modulation wave itself is distorted, resulting in waveform separation into the carrier wave
(ultrasonic wave) and the audio wave (audio signal), and we human beings audible sound of 20
kHz or less (TV audio signal) The principle is that you can hear only, and is generally called
parametric array effect.
[0046]
The ultrasonic speaker shown in FIG. 8 includes an audio frequency band source (an audio signal
source of a television) 51 which generates a signal wave of an audio frequency band, and an
ultrasonic frequency which generates and outputs a carrier wave of an ultrasonic frequency
band. A transmission source 52, a modulator 53, a preamplifier 54, a power amplifier 55, a DC
bias power supply 46, and an ultrasonic transducer 31 are provided.
[0047]
In the above configuration, in the modulator 53, the signal of the audible frequency band (voice
signal of the television) generated by the audible frequency band source (voice signal source of
the television) 51 is used as an input signal to the ultrasonic frequency source 52. The generated
ultrasonic frequency signal (carrier wave signal) is modulated with an audio frequency signal.
The preamplifier 54 performs pre-stage amplification of the modulation signal, and the power
amplifier 55 further amplifies the modulation signal. When the modulated signal amplified by the
power amplifier 55 is converted to a sound wave (ultrasound) by the electrostatic ultrasonic
transducer 31 and released into air, a parametric effect occurs during air propagation, and the
audio frequency sound is self-demodulated. You can hear an audible sound.
[0048]
As described above, the television is equipped with a directional speaker, the bed is equipped
with a sound field forming device, the shape and installation position of the sound field forming
device are optimized, and the sound field forming device is equipped with a variable mechanism.
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Even if the viewer is in any posture (sleeping state, reclining state), and even if the position of the
television is at any position, it is possible to easily hear the sound of the television. Furthermore,
by configuring to prevent sound leakage to the surroundings due to diffuse reflection of
ultrasonic waves, it is possible to enjoy a television without using troublesome earphones without
concern for the surroundings.
[0049]
Although the embodiment of the present invention has been described above, the television
system of the present invention is not limited to only the illustrated example described above,
and various changes may be made without departing from the scope of the present invention. Of
course.
[0050]
FIG. 1 is a diagram showing an example of the configuration of a television system according to
the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS The external view of the television main body used with
the television system of this invention. The figure which shows the structural example when
making a bed a reclining state. The figure which shows the structural example of a sound field
formation device. The figure which shows the structural example of an automatic movement
mechanism. FIG. 1 is a block diagram showing an overall configuration of a television system.
Operation | movement explanatory drawing of an electrostatic type ultrasonic transducer. The
figure which shows the structural example of the ultrasonic speaker incorporated in a television.
Explanation of sign
[0051]
DESCRIPTION OF SYMBOLS 1 ... Television system, 2 ... Bed, 10 ... Television, 11 ... Ultrasonic
speaker, 12 ... Position detection receiver, 13 ... Automatic movement mechanism, 14 ... Control
part, 15 ... Sound field formation part position discrimination | determination part, 16 ...
Ultrasonic speaker position control unit, 20: sound field formation unit, 21: position detection
transmitter, 22: variable mechanism, 23: support unit, 31: ultrasonic transducer, 32: holder, 33:
magnetic plate, 34: magnetization device , 40, 41 fixed electrode, 42: diaphragm, 44: through
hole, 45: support member, 46: DC bias power source, 51: audio frequency band source, 52:
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ultrasonic frequency source, 53: modulator, 54 ... Preamplifier, 55 ... Power amplifier
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