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JP2004120407

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DESCRIPTION JP2004120407
A multi-channel reproduction device and a multi-channel reproduction speaker device capable of
simply and accurately transmitting an audio signal reproduced by a multi-channel reproduction
device to a multi-channel reproduction speaker device. An audio signal is input, the input audio
signal is processed by a signal processing means, and the signal processing means supplies the
processed signals to a plurality of speaker devices and outputs the signals. A signal processing
circuit 7 for converting the input audio signal into a multi-channel audio signal, a compression
circuit 8 for compressing the converted multi-channel audio signal for each channel, a channel
identifier for the compressed audio signal for each channel A channel identifier adding circuit 9
to be added and a transmitting means 15 for transmitting a multi-channel audio signal to which a
channel identifier is added are provided. [Selected figure] Figure 1
Multi-channel playback device and multi-channel playback speaker device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multi-channel reproducing device and a multi-channel reproducing speaker device, and more
particularly to a multi-channel reproducing device and a multi-channel reproducing speaker
device for transmitting reproduced signals through wireless means. . 2. Description of the Related
Art FIG. 5 is a diagram for explaining a multi-channel reproduction system consisting of a
conventional multi-channel reproduction device and a speaker device. In the figure, reference
numeral 30 denotes a multi-channel reproduction apparatus such as an LD player and a DVD
player. A speaker device for each channel is connected to the output terminal of the multichannel
reproduction device 30. For example, in the case of outputting five channels of audio signals, five
speaker devices 31a to 31e are connected, and each speaker device is disposed around the
listener 50, respectively. The five speaker devices are, for example, front center (Cch) speaker
device 31a, front left (Lch) speaker device 31b, front right (Rch) speaker device 31c, rear left
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surround (SLch) speaker device 31d, rear right It is a surround (SRch) speaker device 31e. In
addition, when reproducing 5.1 channel audio signals, a bass-only (SWch) speaker device 31f
corresponding to 0.1 channel worth of audio signals is added to the five speaker devices, and
each speaker device is added Output audio signals of each channel simultaneously. Thus, the
listener can listen to the realistic surround audio signal. However, in this device, in order to
output audio signals to the respective speaker devices, it is necessary to connect the speaker
devices of the multi-channel reproduction devices 30 and 6 with connection cables. For this
reason, the connection of the said connection cable becomes complicated (for example, refer
patent document 1, 2). FIG. 6 is a view for explaining a conventional multi-channel reproduction
system using infrared rays as a means for transmitting an audio signal. Thereby, the
troublesomeness of connection cable connection can be eliminated. The multi-channel playback
device 30 includes an infrared light emitting unit 40 for outputting an audio signal to each
speaker device using infrared light, and each speaker device receives the infrared light emitted
from the infrared light emitting unit 40. Each has a light receiving unit (not shown). Thus, the
audio signals of the respective channels reproduced by the multi-channel reproduction device 30
can be output from the respective speaker devices without connecting the multi-channel
reproduction device 30 and the respective speaker devices with the connection cable.
The light emitting unit 40 of the multi-channel reproduction device 30 needs to output different
audio signals to the respective speaker devices. For this reason, it is necessary for the FM
modulation circuit to output infrared light at a different modulation carrier frequency for each
channel (see, for example, Patent Document 3). [0005] [Patent Document 1] Japanese Patent
Application Laid-Open No. 10-243499 [Patent Document 2] Japanese Patent Application LaidOpen No. 2000-15900 [Patent Document 3] Japanese Patent Application Laid-Open No. 6120903 [0008] However, in the above-mentioned conventional system, a speaker is used. Since
it is necessary to provide the multi-channel reproduction device with a number of infrared light
emitting units corresponding to the number of devices, the cost of the multi-channel
reproduction device becomes expensive. Further, in order to simultaneously listen to the audio
signal output from each speaker device, the listener listens at a position substantially at the
center of each speaker device as shown in FIG. 6 (a) or 6 (b). It is desirable to do. In this case, as
shown in the figure, one or more of the listeners at approximately the center of each speaker
device block the infrared ray transmitting the audio signal, and the audio signal to be output
from the speaker device is It may be lost. The present invention has been made in view of these
problems, and a multi-channel reproducing device capable of simply and accurately transmitting
an audio signal reproduced by a multi-channel reproducing device to a multi-channel
reproducing speaker device SUMMARY OF THE INVENTION In order to solve the abovementioned problems, the present invention adopts the following means. In the multi-channel
playback apparatus, which receives an audio signal, processes the input audio signal by the
signal processing means, supplies the processed signal to a plurality of speaker devices and
outputs the signal, the signal processing means receives the input audio A signal processing
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circuit that converts a signal into a multi-channel audio signal, a compression circuit that
compresses the converted multi-channel audio signal for each channel, and a channel identifier
that adds a channel identifier to the compressed audio signal for each channel An additional
circuit and transmission means for transmitting a multi-channel audio signal with a channel
identifier added are provided. DETAILED DESCRIPTION OF THE INVENTION Embodiments of the
present invention will be described below with reference to the attached drawings.
FIG. 1 is a diagram for explaining the details of the multi-channel reproduction device 100 and
the multi-channel reproduction speaker device 200. As shown in FIG. In the figure, 1 is an optical
disk, 2 is a drive device for the optical disk 1, 3 is an optical pickup, 4 is a drive device for the
optical pickup 3, 5 is a signal processing matrix amplifier, 6 is an amplifier for driving devices 2
and 4 and 7 is an amplifier. A signal processing unit that decodes a multi-channel audio signal
and generates a drive signal for driving the drive devices 2 and 4, 8 is an audio signal
compression circuit that compresses the audio signal according to, for example, the MPEG
system, 9 is a channel identifier assignment circuit A channel identification number is assigned to
each channel data of the multi-channel audio signal. A light emitting circuit 10 converts a multichannel audio signal given a channel identification number into infrared light, and an infrared
light emitting unit 15 drives the light emitting circuit 10. Reference numeral 11 denotes a
microcomputer for controlling each unit, 12 denotes a display unit, and 13 denotes an operation
panel remote control circuit for receiving an operation instruction from a remote control slave
unit. An infrared light receiving unit 26 receives infrared light emitted by the infrared light
emitting unit 15 or the speaker device 200 for multichannel reproduction, and an infrared light
receiving circuit 16 converts the received infrared light into a multichannel audio signal. A
channel identifier detection circuit 17 extracts only an audio signal of a designated channel from
among the multi-channel audio signals based on an identifier designated by a channel identifier
setting means 25 described later. Reference numeral 18 denotes a data expansion circuit for
expanding the extracted audio signal, 19 denotes an audio signal processing circuit, 20 denotes a
D / A (Digital / Analog) conversion circuit, 21 denotes an amplifier, and 22 denotes a speaker.
Reference numeral 23 denotes a microcomputer for controlling each unit, 24 denotes a display
unit for displaying the identifier and the like, and 25 denotes identifier setting means. The
identifier setting means 25 sets a channel identifier for designating a channel to be reproduced
based on, for example, an operation instruction from a remote control slave unit. An infrared
light emitting unit 27 converts the audio signal received by the light receiving circuit 16 into
infrared light again to emit light. FIG. 2 is a diagram for explaining the configuration of a multichannel audio signal. In the figure, ch1, ch2 ... chn are channel identifiers assigned to each
channel, ch1 DATA, ch2 DATA, ... ch2 DATA are audio signals for each channel to which channel
identifiers ch1, ch2 ... chn are attached is there.
Also, Time DATA is a synchronization signal for synchronizing and outputting the audio signals
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of ch1DATA,..., ChnDATA, and T is a data transfer cycle. As described above, the multi-channel
audio signal including the audio signal and the synchronization signal for each channel to which
the channel identifiers ch1, ch2,. The signal is output, for example, in the form of a chain or
radially to the multi-channel reproduction speaker device 200. On the other hand, each of the
multi-channel reproduction speaker devices 200 receives the infrared rays obtained by
converting the multi-channel audio signal, and only the audio signal of the designated channel
among the output signals is received by the channel identifier setting means 25. And reproduces
the extracted audio signal in synchronization with the synchronization signal. As a result, it
becomes possible to freely transmit and receive infrared light regardless of the order of reception
and emission of infrared light by each multi-channel reproduction speaker device. FIG. 3 is a view
for explaining a multi-channel reproduction device and a multi-channel reproduction speaker
device according to the embodiment of the present invention, and FIG. 3 (a) is a view showing the
multi-channel reproduction device 100; b) is a figure which shows the speaker apparatus 200 for
multi-channel reproduction ¦ regeneration. In FIG. 3A, reference numeral 100 denotes a multichannel playback device. An infrared light emitting unit 15 is rotatably mounted on the surface
of the case of the reproducing apparatus 100. In FIG. 3B, reference numeral 200 denotes a
speaker apparatus for multi-channel reproduction. An infrared light receiving unit 26 is rotatably
mounted on the surface of the housing of the speaker device 200. The infrared light receiving
unit 26 receives the infrared light emitted by the infrared light emitting unit 15 or the infrared
light emitted by the infrared light emitting unit 27 of another speaker device 200. An infrared
light emitting unit 27 is rotatably attached to the housing of the speaker device. In these figures,
the same parts as those shown in FIG. 1 are given the same reference numerals and the
explanation thereof is omitted. FIG. 4 is a diagram for explaining an example of signal
transmission between the multichannel reproduction device and the multichannel reproduction
speaker device. For example, as shown in FIG. 4, the multi-channel reproduction speaker devices
200 a to 200 f and the multi-channel reproduction device 100 are arranged.
That is, the multi-channel reproduction device 100 converts the reproduced multi-channel
reproduction signal into infrared light and emits light from the infrared light emitting unit 15.
The infrared light emitted from the infrared light emitting unit 15 is received by the infrared
light receiving unit 26 of the speaker device 200a for multichannel reproduction for Cch. The
multi-channel reproduction speaker device 200a converts the received infrared light into an
electric signal and reproduces a reproduction signal of a designated channel from a speaker. At
this time, the reproduction speaker device 200 a converts the electric signal again into infrared
light and emits light from the infrared light emitting unit 27. The infrared light emitted by the
infrared light emitting unit 27 of the Cch multi-channel reproducing speaker device 200a is
received by the infrared light receiving unit 26 of the Lch multi-channel reproducing speaker
device 200b. The multi-channel reproduction speaker device 200b converts the received infrared
light into an electric signal, and reproduces a reproduction signal of a designated channel from a
speaker. At this time, the reproduction speaker device 200 b converts the electric signal again
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into infrared light and emits light from the infrared light emitting unit 27. Similarly, each of the
multi-channel reproducing speaker devices 200c, 200d, 200e, and 200f receives light by the
infrared light receiving unit 26, converts the received infrared light into an electrical signal, and
reproduces the reproduction signal of the designated channel. The electric signal is reproduced
again from the speaker, and the electric signal is converted again into infrared light, and the
infrared light emitting unit 27 emits light. Although infrared rays are used as a transmission
medium in the above description, other electromagnetic waves can be used. As described above,
the speaker devices 200a to 200f are arranged around the listener 30, and the infrared light
emitted by the multi-channel playback device 100 is transmitted to each speaker device in a
chain shape, or each speaker device The configuration may be such that the infrared light
emitted by the multi-channel playback device 100 is received directly or the infrared light
emitted by the infrared light emitting unit of another speaker device is received. For this reason,
it is possible to prevent the listener 30 at the central position of each speaker device from
blocking infrared rays and interrupting the audio signal output from the speaker device. As
described above, according to the present invention, a multi-channel reproducing device capable
of simply and accurately transmitting an audio signal reproduced by the multi-channel
reproducing device to a multi-channel reproducing speaker device; A speaker device for
multichannel reproduction can be provided.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining the details of a multichannel reproduction device and a multi-channel reproduction speaker device according to an
embodiment of the present invention. FIG. 2 is a diagram for explaining the configuration of a
multi-channel audio signal. FIG. 3 is a diagram for explaining a multi-channel reproduction device
and a multi-channel reproduction speaker device. FIG. 4 is a diagram for explaining an example
of signal transmission between a multi-channel reproduction device and a multi-channel
reproduction speaker device. FIG. 5 is a diagram for explaining a conventional multi-channel
reproduction device. FIG. 6 is a diagram for explaining a conventional multi-channel reproduction
apparatus using infrared light. Explanation of the code 1 optical disk 2 optical disk drive device 3
optical pickup 4 optical pickup drive device 5 signal processing matrix amplifier 6 amplifier 7
signal processing unit 8 audio signal compression circuit 9 channel identifier assignment circuit
10 infrared light emission circuit 11 microcomputer 12 display Section 13 Operation panel
remote control circuit 15 Infrared light emitting unit 16 Infrared light receiving circuit 17
Channel identifier detection circuit 18 Data expansion circuit 19 Audio signal processing circuit
20 DA conversion circuit 21 Amplifier 22 Speaker 23 Microcomputer 24 Display unit 25
Identifier setting means 26 Infrared light receiving unit 27 Infrared emitter
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