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JPH0396022

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DESCRIPTION JPH0396022
[0001]
The present invention relates to a stereo reproduction apparatus for optical space transmission.
FIGS. 5 and 6 are block diagrams of the main parts of a conventional stereo reproduction
apparatus by optical space transmission. Fig. 5 shows the arrangement of the transmitting unit
provided in the main unit, and 1 and 1 indicate the left and right channel inputs L +, L2L, and
L.1. Or input R +, I? 2, I? : A program source switching device for switching the program source
connected to l + Ra etc. in a form in which the left and right channels are interlocked, and the
program source selected by this is the volume control devices 2 and 2 ', sound quality correction
circuits 3 and 3' Through to the stereo modulator 4. In the stereo modulator 4, the signals of the
left and right channels are modulated to become one signal, and the modulated signal is
amplified by the amplifier circuit 5 and then emitted from the light emitting element 6 as an
optical signal. FIG. 6 shows the structure of the receiving unit provided on the audio output unit
side, and reference numeral 27 denotes a light receiving element for receiving the light signal
from the light emitting element 6, and the light signal received by the light receiving element 27
is electricity. After being converted into a signal, the signal is amplified by the amplifier circuit
28 and further demodulated by the stereo demodulator 29 into left and right stereo signals. One
of the left and right stereo signals demodulated by the stereo demodulator 29 is amplified by the
power amplifier 30 and then supplied to the speaker 31. FIG. 7 is a system diagram showing the
actual arrangement of the main body A and the audio output units B 'and C', and the main body A
is a transmitting unit shown by 1 to 6 and 1 to 3 'in FIG. Are included, and the audio output units
B "of the left and right channels (+ each have a receiver shown in FIG. 6 at 27-1 to 31). A stereo
signal is transmitted by space transmission by light between the light emitting element 6 and the
light receiving element 27 shown in FIGS. 5 and 6 between the main body 81 audio output part B
and between the main body audio output part C. As compared with the cable transmission,
almost no transmission loss occurs. However, in the conventional apparatus as described above,
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when a person or the like passes between the main body A voice output section B or the main
body A voice output section C and cuts off the signal transmission light, the sound is interrupted.
It has the drawback of causing Therefore, in order to prevent such a problem, conventionally, the
light emitting unit and the light receiving unit have been disposed by placing the light emitting
unit and the light receiving unit above the height of the person's back There was a problem that
was not made use of. Means for Solving the Problems In order to solve the problems described
above, the present invention provides an optical transmission stereo reproduction apparatus for
spatially transmitting between a main body and first and second audio output units using light.
First and second light emitting means provided in first and second audio output units for
converting again the stereo signal from the main body received by the second audio output unit
into optical signals, and the first and second light emission units Means for providing a second
and a first light receiving means provided in the second and the first audio output unit for
receiving the spatially transmitted light signal, and an optical signal from the main body in the
first and the second audio output unit And signal selecting means for selectively deriving one of
the light signals from the second and first audio output units received by the first and second
light receiving means.
Therefore, the spatially transmitted light signal guided from the main body to the first and
second audio output units is once converted into an electrical signal, and then converted again
into an optical signal by the first and second light emitting means, It is led to the 2nd and 1st
light-receiving means provided in 2 and the 1st audio ¦ voice output part. Then, in each of the
first and second audio output units, one of the light reception signal from the main body and the
light reception signal from the second and first audio output units received by the first and
second light receiving means is selected Is selected as the output signal of the first and second
audio output units. Therefore, even if any one of the light transmission paths through which the
space is transmitted is interrupted by the obstacle, the signals of the left and right channels can
be reproduced without interruption. FIGS. 1 to 3 are schematics or diagrams of an embodiment
of the present invention. FIG. 1 is a block diagram showing the arrangement of the transmitting
unit A. Since the arrangement is the same as that of the transmitting unit A of the conventional
example shown in FIG. 5, the same reference numerals are given to the corresponding parts and
the description is omitted. FIG. 2 is a block diagram showing the structure of the receiver B or C
(corresponding to B and C in FIG. 3). In the figure, one of 7 and 7 'is a light receiving element for
receiving the light signal from the light emitting element 6 shown in FIG. 1 and converting it into
an electric signal, and the other 7' or 7 'is the other one described later. A light receiving element
for receiving an optical signal from the light emitting element l4 of the channel and converting it
into an electric signal, and an output signal of the light receiving element 7 or 7 'is amplified by
an amplifier circuit 8 or 8', respectively. Lead to The signal selection device 9 selectively derives
the output signal of the amplifier circuit 8 or 8 °, and when either one of the output of the
amplifier circuit 8 or 8 'disappears, the other output is derived. Alternatively, when both outputs
are derived from 8 °, the output from one of the predetermined amplification circuits is derived.
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A stereo demodulator 10 demodulates the stereo modulation signal from the signal selection
device 9 and outputs a demodulation signal of either the left channel or the right channel. The
signal demodulated by the stereo demodulator 10 is a power amplifier 1l. And is led to the
speaker 12 of the left or right channel. Reference numeral 13 denotes an amplification circuit for
amplifying the output signal of the amplification circuit 8, and reference numeral 14 denotes a
light emitting element for converting the output signal of the amplification circuit 13 into an
optical signal and retransmitting it. FIG. 3 is a schematic diagram showing the coupling state of
the transmitting portion A shown in FIG. 1 and the receiving portion B of the left channel and the
receiving portion C of the right channel shown in FIG.
In the figure, arrows 30. 31 is an optical transmission path between the transmitter A and the
receivers B and C of the left and right channels, respectively; Reference numeral 33 denotes an
optical transmission path between the receivers B and C of the left and right channels, and 34
denotes a listener. FIG. 4 is a block diagram showing a specific arrangement using the receiving
unit shown in FIG. 2 for the left and right channel receiving units shown in the arrangement
diagram of FIG. 3; As apparent from FIGS. 3 and 4, when an obstacle such as a person enters the
light transmission path 30 between the transmitting part A and the receiving part B and blocks
the light transmission path 30, the light transmission path 30 can not be used. However, the
signal path to the receiver B is secured using the optical transmission paths 31 and 33.
Therefore, the stereo modulation signal transmitted from the light emitting element 6 of the
transmission section A is received by the light receiving element 7 in the reception section C of
the right channel through the light transmission path 3l and is guided to the signal selection
device 9 through the amplification circuit 8 . Now, since the light transmission path 30 is cut off,
no signal is led out to the light transmission path 32, and no output signal is generated at the
light receiving element 7 'and the amplification circuit 8' in the reception section C of the right
channel. Therefore, the signal selection device 9 outputs the signal received by the light receiving
element 7 of the right channel, demodulates it by the stereo demodulator 10, takes out the signal
of the right channel, amplifies it by the power amplifier 11, and then amplifies the sound signal
of the right channel from the speaker 12. Output A stereo signal received by the light receiving
element 7 of the right channel through the light transmission path 3l is taken out as a light
output through the amplification circuits 8 and 13 and the light emitting element l4, and a
receiver B of the left channel through the light signal path 33. Led to the light receiving element
7 ′ ′. The signal led to the light receiving element 7 is converted into an electric signal, and
then led to the signal selection device 9 through the amplification circuit 8 '. The signal selection
device 9 has no signal input from the light receiving element 7 and the amplification circuit 8
because the transmission path 30 is cut off, and the signal selection device 9 outputs a stereo
signal from the amplification circuit 8 '. The stereo signal derived from the signal selection device
9 is demodulated by the stereo demodulator IO, and the signal of the left channel is guided to the
speaker 12 of the left channel through the power amplifier 11, and the audio signal of the left
channel is outputted from the speaker. Even when the light transmission path 31 is blocked by
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any obstacle, as in the case where the light transmission path 30 is blocked, the audio output of
the left and right channels can be derived from the left and right channel speakers 12
respectively. . When the light transmission paths 32 and 33 between the two reception units B
and C are blocked by an obstacle such as a human, a stereo signal from the transmission unit A is
conducted to the light receiving elements 7 of the left and right channels by the light
transmission paths 30 and 31. Since no signal is introduced to the light receiving element 7 ', the
signal received by the light receiving element is outputted to the signal selecting device 9 of the
left and right channels, and the audio signal of the left and right channels is outputted from the
speakers 12 of the left and right channels.
Any light transmission path 30, 31, 32. When 33 is not cut off either, stereo signals are derived
respectively from both light receiving elements 7 and 7 'of the left and right channels, but each
signal selecting device 9 selects an output from light receiving element 7 or 7' defined in advance
and The audio signals of the left and right channels are output from the channel speakers 12
respectively. Accordingly, the optical transmission path 30. 31 and 32. The signal path of the left
and right channels is secured even if any one of 33 is blocked by the obstacle. As described
above, according to the present invention, according to the present invention, any light
transmission path between the audio output parts of the left and right channels comprising the
main part provided with the transmission part and the receiver connected with the light
transmission path is an obstacle. Even if the light is blocked by the signal, the audio signal is
output from the left and right channels without interruption, and it is not necessary to set the
positions of the transmitter and the receiver above the height of the person, which is convenient.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram of a transmitter provided on the main body side of the present invention,
FIG. 2 is a block diagram of a receiver provided on the audio output side, and FIG. 3 is a diagram
of the transmitter and the receivers of the left and right channels. FIG. 4 is a block diagram
showing the specific structure of FIG. 3; FIG. 5 is a block diagram of a transmission unit provided
on the main body side of the conventional example; FIG. FIG. 7 is a block diagram of a receiving
unit provided on the same audio output side, and FIG. 7 is a diagram showing a coupling state of
the transmitting unit and the receiving units of left and right channels by an optical transmission
path.
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A · · · body, B, C · · · voice output unit, 7 "-· light receiving element, 9 · 1 signal selection device,
14-light emitting element, 30. 31,32. 33-· One light space transmission path.
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