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JP2012186694

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DESCRIPTION JP2012186694
An object of the present invention is to save power by stopping power supply to unnecessary
infrared light emitting elements, and to extend the life of the infrared light emitting elements.
SOLUTION: A plurality of infrared light emitting elements 5 for transmitting signals relating to
video or audio to each area, a terminal 3 for receiving signals from the infrared light emitting
elements 5, and a terminal for detecting the presence of the terminal 3 in each area And a power
supply switching unit 6, 8 for stopping power supply to the infrared light emitting element 5
transmitting a signal to the area where the terminal 3 is not present based on the detection result
by the detection unit 2 and the terminal detection unit 2. Equipped. [Selected figure] Figure 1
Audiovisual system and audiovisual transmission apparatus
[0001]
The present invention relates to an audiovisual system and an audiovisual transmission
apparatus that transmit signals relating to video or audio using a plurality of infrared light
emitting elements.
[0002]
In the conventional audiovisual system, for example, an in-vehicle infrared headphone system
includes an RSE (rear sheet entertainment) having an infrared LED (infrared light emitting
element) for transmitting an audio signal, and an infrared headphone for receiving the signal.
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In addition, since infrared LED has directivity, when transmitting a signal to a wide area like the
back seat of a vehicle, it transmits using several infrared LED. Also, conventionally, it is not
possible to know in which area the infrared headphone is used, so when a person does not sit in
the back seat or when listening to sound from the speaker in the car without using the infrared
headphone Even then, all infrared LEDs are always powered and transmitting signals.
[0003]
JP, 2006-352523, A
[0004]
As described above, in the conventional infrared headphone system, power is always supplied to
all the infrared LEDs even when the infrared headphones are not used, so there is a problem that
unnecessary power is consumed. .
The power consumed by the infrared LED accounts for about 10% of the power consumed by the
entire system, and it is required to reduce the unnecessary power of the infrared LED. Moreover,
since electric power is always supplied, the subject that the lifetime of infrared LED became short
occurred.
[0005]
On the other hand, there is one that changes the power mode of the headphone to the power
saving mode when the headphone is not worn by the passenger (see, for example, Patent
Document 1). However, the system disclosed in Patent Document 1 is a two-way communication
system that performs wireless transmission and reception with respect to one headphone using
one Bluetooth antenna (registered trademark). Therefore, the configuration is different from that
of an infrared headphone system using a plurality of infrared LEDs having directivity, and the
infrared headphone only receives data and can not perform bidirectional communication.
Therefore, there is a problem that the power mode can not be changed.
[0006]
In addition, in the case of high-power infrared LEDs for sound transmission, even if the infrared
headphones are not used, the infrared LEDs are lit in red during signal transmission, which
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causes a problem of being disturbed.
[0007]
The present invention has been made to solve the above-described problems, and by stopping
power supply to unnecessary infrared light emitting elements in an audiovisual system that
transmits signals using a plurality of infrared light emitting elements. It is an object of the
present invention to provide an audiovisual system and an audiovisual transmission apparatus
capable of saving power and extending the life of an infrared light emitting element.
[0008]
The audiovisual system according to the present invention detects the presence of a plurality of
infrared light emitting elements transmitting signals relating to video or audio to each area, a
terminal receiving signals from the infrared light emitting elements, and a terminal in each area
A terminal detection unit, and a power supply switching unit for stopping power supply to an
infrared light emitting element transmitting a signal to an area where there is no terminal based
on a detection result by the terminal detection unit .
[0009]
According to the present invention, as configured as described above, in the audiovisual system
that transmits signals using a plurality of infrared light emitting elements, power saving is
achieved by stopping the power supply to unnecessary infrared light emitting elements. And the
lifetime of the infrared light emitting device can be extended.
[0010]
It is a figure which shows the structure of the infrared headphone system which concerns on
Embodiment 1 of this invention.
It is a figure which shows the example of arrangement | positioning of the infrared headphone
system which concerns on Embodiment 1 of this invention.
It is a flowchart which shows the power supply switching operation | movement of the infrared
headphone system which concerns on Embodiment 1 of this invention.
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[0011]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
Embodiment 1
In addition, below, it shows about the case where the infrared headphone system for vehicles is
used as a video-and-sound system which transmits a signal using several infrared light emitting
elements. As shown in FIG. 1, this infrared headphone system is composed of an RSE 1, a
headphone detection means (terminal detection unit) 2 and an infrared headphone (terminal) 3.
[0012]
The RSE 1 transmits an audio signal to an infrared headphone 3 provided in the rear seat of the
vehicle. The RSE 1 includes an IR transmitter 4, an infrared LED 5, a switch 6, a power supply 7
and an MCU (main control unit) 8.
[0013]
The IR transmitter 4 FM-modulates an audio signal (L / R) received from the outside. The
infrared LED 5 transmits an audio signal FM-modulated by the IR transmitter 4 to a
predetermined area (an area located when the corresponding infrared headphone 3 is attached
(used) to a passenger). In addition, since infrared LED5 has directivity, for example, as shown in
FIG. 2, when several infrared headphones 3 are installed in the back seat of a vehicle, each area
using several infrared LED5 is used. Sending a signal to
[0014]
The switch 6 performs connection / disconnection of the power supply line between the infrared
LED 5 and the power supply 7 under the control of the MCU 8. The power source 7 supplies
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power to the infrared LED 5 by connection of the switch 6. The MCU 8 instructs connection /
disconnection of each switch 6 based on the detection result of the presence / absence of the
infrared headphone 3 by the headphone detection means 2. In the MCU 8, when the headphone
detection means 2 detects that the infrared headphone 3 is not present in the area (the infrared
headphone 3 is not attached), the infrared LED 5 transmitting a signal to this area In order to
stop the power supply to the power supply, the switch 6 corresponding to the infrared LED 5 is
instructed to cut off. On the other hand, when the MCU 8 detects that the infrared headphone 3
is present in the area (the infrared headphone 3 is attached) by the headphone detection means
2, the infrared ray transmitting a signal to this area In order to supply power to the LED 5, a
connection instruction is given to the switch 6 corresponding to the infrared LED 5. The switch 6
and the MCU 8 correspond to the power supply switching unit of the present invention.
[0015]
The headphone detection means 2 detects whether the infrared headphones 3 are present in
each area where each infrared LED 5 is transmitting signals, thereby detecting whether the
infrared headphones 3 are attached (used) to the passenger It is The detection method by this
headphone detection means 2 will be described later. The infrared headphone 3 receives and
demodulates the FM-modulated audio signal from the infrared LED 5 to reproduce audio. The
infrared headphones 3 are provided at each rear seat of the vehicle.
[0016]
Next, a method of detecting the presence or absence of the infrared headphone 3 by the
headphone detection means 2 will be described. In the following, as shown in FIG. 2, an example
will be described in which the infrared headphones 3 are provided in each rear seat and it is
detected whether the infrared headphones 3 exist in the area near each headrest 9. As a method
for detecting the presence or absence of the infrared headphone 3, first, there is a method using
image recognition. In this case, first, an area in the vicinity of each headrest 9 is photographed
using a camera (not shown) installed in the car and in the RSE 1. Then, the captured image is
analyzed by the headphone detection means 2 to detect the presence or absence of the infrared
headphone 3 (whether the infrared headphone 3 is attached to the passenger). Images of the
head of the occupant sitting in each rear seat, that is, the vicinity of the headrest 9, are taken
with cameras installed in the car and in the RSE 1, the taken image is analyzed, and the head and
face of the occupant in a circle. Identify the pupil from the two black points inside, estimate the
left and right outer ear positions that are approximately at the same height as the pupil, and
determine whether there is a covering shape that covers the outer ear in the vicinity of the
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estimated outer ear position. , To detect the presence of infrared headphones 3. The
configuration of the headphone detection means 2 for analyzing an image is composed of an
image processing LSI and a program.
[0017]
There is also a method in which an ID tag is embedded in the infrared headphone 3 and the
headphone detection device 2 (ID tag detection device) is embedded in each headrest 9 to detect
the presence or absence of the infrared headphone 3. When the passenger brings his head close
to the headrest 9 with the infrared headphone 3 attached, the ID tag inside the infrared
headphone 3 is detected by the headphone detection means 2 inside the headrest 9 and detects
the presence / absence of the headphone of the passenger Do. The headphone detection means 2
transmits the result of determination as to whether or not the headphone is attached to the MCU
8 of the RSE 1, and the MCU 8 performs power ON / OFF control of the infrared LED 5 of the
corresponding area according to the determination result. In this case, the ID tag is a "1-bit tag"
composed of only a simple coil and a capacitor, such as a shoplifting tag, or an IC chip on which a
specific ID number is recorded. It is detected by the headphone detection means 2 comprised of
an antenna, a tuner, a reader IC, and a microcomputer. As described above, when the headphone
detection device 2 can detect the ID tag, it can be determined that the infrared headphone 3 is
present in the area near the headrest 9, so the presence or absence of the infrared headphone 3
can be detected.
[0018]
There is also a method of detecting the presence or absence of the infrared headphone 3 by
detecting the presence or absence of the passenger using a move eye sensor (registered
trademark; hereinafter abbreviated) or a seating sensor. In this case, when the presence of the
passenger is detected by the move eye sensor or the seating sensor, it is estimated that the
infrared headphone 3 is worn regardless of whether the passenger wears the infrared headphone
3 or not. Do.
[0019]
Next, the power supply switching operation of the infrared headphone system configured as
described above will be described. In the power supply switching operation of the infrared
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headphone system, as shown in FIG. 3, first, the headphone detection means 2 detects whether
the infrared headphone 3 is present in each area where each infrared LED 5 transmits a signal.
(Step ST1). That is, the headphone detection means 2 detects whether the infrared headphone 3
is present in each area, using the above-described detection method by image recognition,
detection method by ID tag detection, detection method by passenger detection, or the like.
[0020]
In this step ST1, when the headphone detection means 2 detects that the infrared headphone 3 is
present in a certain area, the MCU 8 sends a signal to this area to the switch 6 corresponding to
the infrared LED 5. A connection instruction is issued (step ST2). Next, the switch 6 connects the
power supply line between the infrared LED 5 and the power source 7 in accordance with the
connection instruction from the MCU 8 to supply power to the infrared LED 5 (step ST3). Thus,
the infrared LED 5 transmits an audio signal.
[0021]
On the other hand, in step ST1, when the headphone detection means 2 detects that the infrared
headphone 3 is not present in a certain area, the MCU 8 corresponds to the infrared LED 5
transmitting a signal to this area. The switch 6 is instructed to disconnect (step ST4). Next, the
switch 6 disconnects the power supply line between the infrared LED 5 and the power source 7
according to the disconnection instruction from the MCU 8 to stop the power supply to the
infrared LED 5 (step ST5). Thereby, infrared LED5 stops transmission of an audio | voice signal.
[0022]
By operating in this manner, for example, as shown in FIG. 2, the passenger on the left end wears
the infrared headphone 3, so power is supplied to the infrared LED 5 transmitting a signal to this
area, And since the passenger at the right end does not wear the infrared headphone 3, power
can not be supplied to the infrared LED 5 transmitting a signal to this area, and power saving can
be achieved.
[0023]
As described above, according to the first embodiment, in the infrared headphone system that
transmits a signal to each area using the plurality of infrared LEDs 5, the infrared headphone 3 is
present in the area (the infrared headphone 3 is attached) In the case where the infrared LED 3
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transmitting a signal to this area is supplied with power, the infrared headphone 3 is not present
in the area (the infrared headphone 3 is not attached). Is configured to stop the power supply to
the infrared LED 5 transmitting a signal to this area, the power saving can be achieved by
stopping the power supply to the unnecessary infrared LED 5. Life can be extended.
[0024]
In the first embodiment, although the case of using the car infrared headphone system as the
audiovisual system is described, the present invention is not limited thereto. For example, the left
video and the right video are alternately displayed by the frame sequential method. 3D using an
RSE monitor and active shutter glasses that receive a synchronization signal corresponding to the
display cycle of this image via an infrared light emitting element and alternately open and close
liquid crystal shutters of left and right lenses based on this synchronization signal It may be
applied to a video system.
Also in this case, it is detected whether active shutter glasses are present in each area where the
infrared light emitting element is transmitting signals (whether or not the active shutter glasses
are attached), and the signals are transmitted to the unnecessary areas. Stop the power supply to
the infrared light emitting element.
As a result, power can be supplied only to the infrared light emitting element transmitting a
signal to the area where the active shutter glasses are used, leading to reduction in power
consumption. In addition, the present invention may be applied to a 3D video system using
polarized glasses that receive video signals via infrared light emitting elements and reproduce
video. In addition, the present invention is similarly applicable to a home audiovisual system
including a speaker that receives an audio signal transmitted by an infrared light emitting
element and reproduces the audio. In the first embodiment, the RSE 1 is used. However, the
present invention is not limited to this, and other in-vehicle information devices may be used.
[0025]
Further, within the scope of the invention of the present application, it is possible to deform any
component of the embodiment or omit any component of the embodiment.
[0026]
DESCRIPTION OF SYMBOLS 1 RSE, 2 Headphones detection means (terminal detection part), 3
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infrared headphone (terminal), 4 IR transmitter, 5 infrared LED (infrared light emitting element),
6 switch (power supply switching part), 7 power supplies, 8 MCU (power supply) Switching unit).
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