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JP2006324939

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006324939
PROBLEM TO BE SOLVED: To provide an audio system capable of realizing power saving by
switching communication media used by both transmitting and receiving devices when an audio
signal disappears or an audio level becomes low. Do. SOLUTION: A high-speed digital wireless
transmission method with high data efficiency as a communication method between the
transmitting device 2 and the receiving device 3 when an audio signal from the AV device 1 to
each of the speakers 4-5, 4-6 is not output. To the low power consumption FM transmission
scheme. Then, when the output of the audio signal from the AV device 1 to each of the speakers
4-5 and 4-6 is resumed, the communication method between the transmitting device 2 and the
receiving device 3 is switched to the high-speed digital wireless transmission method. [Selected
figure] Figure 1
Audio system, transmitting apparatus and receiving apparatus in the audio system
[0001]
The present invention relates to an audio system for transmitting an audio signal to be
reproduced to a speaker by means of a wireless circuit to perform audio output.
[0002]
Conventionally, an audio such as a so-called surround system or Dolby system that reproduces a
sound field by reproducing an audio signal that is an audio signal from an AV (Audio Visual)
device that reproduces audio and video using a plurality of speakers A system is provided.
01-05-2019
1
In such an audio system, a so-called 5.1 channel audio output can be performed by connecting
five speakers corresponding to front left and right, front center, and rear left and right with one
speaker dedicated to the low frequency range, or There are those that can connect so-called 7.1
channels of audio output by connecting eight speakers and adding two more channels to 5.1
channels.
[0003]
Furthermore, in recent years, with the development of wireless communication technology, in
such an audio system, a wireless system is provided instead of a cable serving as a cable between
an AV device and an external speaker. . As an audio system such as this, an audio system for
constructing a surround system with four speakers by connecting left and right rear speakers as
an external apparatus to the AV apparatus provided with the left and right front speakers is
described as such an audio system. It proposes (refer to patent documents 1). Also, in an audio
system using a 2.4 GHz band digital transmission method, audio from the AV device is
transmitted by performing wireless communication using the same channel in the 2.4 GHz band
between the AV device and an external speaker. A signal is sent to the speaker to produce an
audio output. Japanese Patent Application Laid-Open No. 6-53867
[0004]
In the audio system using this wireless communication, when the 2.4 GHz band digital
transmission method is used, the frequency scanning is performed in the 2.4 GHz band in the
receiving apparatus connected to the speaker, and the AV apparatus Look for the signal from the
connected transmitter. Then, an audio signal is transmitted from the transmitting device to the
receiving device by setting the same frequency channel in both the transmitting and receiving
devices. In this audio system, in the transmitting device, the audio signal can not be received for
any reason, that there is no sound temporarily in the content reproduced by the AV device or
there is no audio signal because the AV device is turned off. I can not confirm it.
[0005]
Therefore, even when the power of the AV device is turned off, the transmission device remains
on, causing unnecessary power consumption. In addition, when the AV device is ON, it is
01-05-2019
2
necessary to perform a transmission operation for transmitting to the receiving apparatus an
audio signal whose sound level becomes the lowest level even when the voice to be reproduced is
unvoiced and there is no audio signal. To waste power. Furthermore, in such an audio system,
when a high frequency signal such as a 2.4 GHz band digital transmission scheme is used, the
power consumption in both the transmitting and receiving devices is large.
[0006]
Also, even if the transmission device is turned off, the user needs to instruct to turn off the
reception device as well, and the power is turned off by directly operating the reception device or
by instructing it with an infrared remote control or the like. The receiver operates until it
instructs. Therefore, when the user has forgotten the power-off instruction or when the shield is
present on the infrared communication path by the infrared remote control and the instruction is
not given to the receiving side, the receiving apparatus remains ON. Wasteful power is
consumed. Furthermore, since the power of the receiving apparatus is not automatically turned
off according to the transmitting apparatus, the operability is also bad.
[0007]
In view of such problems, the present invention provides an audio system capable of achieving
power saving by switching communication media used by both transmitting and receiving
devices when there is no audio signal or when the audio level is lowered. The purpose is to
[0008]
In order to achieve the above object, an audio system according to the present invention includes
a transmitting device including a first wireless transmitting unit that transmits an audio signal as
a wireless signal in a first communication method, and the first communication method from the
transmitting device. An audio system comprising a first wireless receiving unit for receiving a
wireless signal and acquiring an audio signal, in the audio system, when the transmitting device
confirms that there is no audio signal to be transmitted to the receiving device The second
wireless transmission unit performs the signal transmission operation according to the second
communication scheme different from the first communication scheme and consumes less power
than the first wireless transmission unit, and the power of each of the first and second wireless
transmission units is turned on. A power control unit for controlling ON / OFF, and when the
receiving device confirms that there is no audio signal transmitted from the transmitting device
The second wireless receiving unit performs signal reception operation according to a second
communication method different from the communication method and consumes less power
than the first wireless receiving unit, and the power ON / OFF of each of the first and second
01-05-2019
3
wireless receiving units. A power supply control unit for controlling the power supply control
unit, and when it is confirmed in the transmission device that there is no audio signal to be
transmitted to the reception device, the power supply control unit turns off the first wireless
transmission unit When the second wireless transmission unit is turned on and it is confirmed in
the receiving device that there is no audio signal transmitted from the transmitting device, the
power control unit causes the first wireless reception unit to It is turned off and the second
wireless receiving unit is turned on, and it is confirmed in the transmitting device that the audio
signal to be transmitted to the receiving device is generated again. After the output start signal
indicating the generation of the audio signal is generated by the second wireless transmission
unit and transmitted to the receiving apparatus, the power control unit turns the first wireless
transmission unit ON and When the second wireless transmission unit is turned off and the
output start signal from the transmission device is received by the second wireless reception unit
in the reception device, the power control unit causes the first wireless reception unit to It is
characterized in that it is turned on and the second wireless receiving unit is turned off.
[0009]
In such an audio system, in each of the transmitting device and the receiving device, when it is
confirmed that a state in which the signal level of the audio signal is lower than a predetermined
signal level continues for a predetermined time, the audio signal is not present I will judge.
[0010]
In addition, when it is confirmed in the transmission device that there is no audio signal to be
transmitted to the reception device, an output stop signal indicating that the audio signal is not
present is generated by the first wireless transmission unit and the reception device And the
second wireless transmitting unit is turned on by the power control unit, and the output stop
signal from the transmitting device is transmitted to the receiving device. When received by the
first wireless receiving unit, the power control unit may turn off the first wireless receiving unit
and turn on the second wireless receiving unit.
[0011]
The first communication method may be a high-speed digital wireless transmission method, and
the second communication method may be an FM transmission method.
[0012]
A transmitter according to the present invention is a transmitter in an audio system as described
above, wherein as the first transmitter, an A / D converter for converting an audio signal as a
digital signal, and a digital signal from the A / D converter A first modulation unit that modulates
01-05-2019
4
the first modulation unit, a first frequency conversion unit that uses the signal modulated by the
first modulation unit as a signal according to the carrier frequency of the channel assigned to the
first communication scheme, and the first frequency A first antenna for transmitting the signal
frequency-converted by the conversion unit; and a second modulation unit for generating and
modulating the signal to be a specific pattern as the second transmission unit and generating the
output start signal A second frequency converter configured to convert the signal modulated by
the second modulator into a signal according to the carrier frequency of the channel assigned to
the second communication system; Characterized in that it comprises a second antenna for
transmitting the frequency-converted signal, at frequency conversion section.
[0013]
A receiving apparatus according to the present invention is a receiving apparatus in an audio
system as described above, wherein, as the first receiving unit, a first antenna for receiving a
radio signal to be the audio signal, and the first communication system. A first tuning unit for
tuning a signal according to the carrier frequency of the assigned channel, a first demodulation
unit for demodulating the signal tuned by the first tuning unit, and a signal demodulated by the
first demodulation unit And A / D converter for converting into an audio signal to be an analog
signal, wherein the second receiving unit is assigned to a second antenna for receiving a radio
signal as the output start signal, and to the second communication system A second tuning unit
for tuning a signal according to the carrier frequency of the selected channel, and a second
demodulation unit for demodulating the signal tuned by the second tuning unit and supplying
the demodulated signal to the power control unit. And wherein the door.
[0014]
According to the present invention, when there is no audio signal, each of the transmitting device
and the receiving device performs the communication operation according to the second
communication method with low power consumption, so power saving can be achieved in each
device.
In addition, since each of the transmitting device and the receiving device independently shifts to
the communication operation according to the second communication method, even when the
power of the transmitting device is turned off, it is determined that the receiving device is unique
and there is no audio signal. Power saving can be achieved.
Further, since the transmission start signal is transmitted from the transmission device to the
01-05-2019
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reception device, the reception device can confirm that the audio signal is surely present and can
shift to the communication operation by the first communication method.
[0015]
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an audio system in the present
embodiment.
2 is a block diagram showing the internal configuration of the transmission apparatus in the
audio system of FIG. 1, and FIG. 3 is a block diagram showing the internal configuration of the
reception apparatus in the audio system of FIG.
[0016]
The audio system shown in FIG. 1 includes an AV device 1 which selects and outputs an audio
signal from a broadcast signal received by a tuner or a recording signal reproduced from a
recording medium, and a transmitting device which receives and transmits an audio signal from
the AV device 1 2, a receiver 3 for receiving an audio signal transmitted from the transmitter 2,
speakers 4-1 to 4-4 directly connected to the AV device 1, and an audio signal received by the
receiver 3 are given. Speakers 4-5 and 4-6.
Also, the speaker 4-1 is a "center speaker", the speakers 4-2 and 4-3 are respectively a "left front
speaker" and a "right front speaker", the speaker 4-4 is a "subwoofer speaker", and the speakers
It is assumed that 4-5 and 4-6 are “left rear speaker” and “right rear speaker”, respectively,
and a speaker system of 5.1 channels is configured by the speakers 4-1 to 4-6.
[0017]
In such an audio system, the AV device 1 extracts an audio signal which is an audio signal from
the broadcast signal or the recording signal, and transmits the audio signal to the transmitting
01-05-2019
6
device 2 and the speakers 4-1 to 4-4 connected to the AV device 1 Do.
At this time, when the broadcast signal or recording signal processed by the AV device 1 is a
moving image, a visual signal to be a video signal is processed and the image is displayed on a
display unit such as a display provided in the AV device 1. Ru.
The display unit may be provided in the AV device 1 or may be an external device different from
the AV device 1 and a visual signal may be transmitted from the AV device 1 to the display unit.
[0018]
The audio signal transmitted from the AV device 1 to the speakers 4-1 to 4-4 is an audio signal of
a channel handled by each of the speakers 4-1 to 4-4, and is transmitted from the AV device 1 to
the transmitting device 2 The audio signal is an audio signal of a channel handled by the
speakers 4-5, 4-6. That is, the audio signal of the center channel (C channel) is output to the
speaker 4-1, the audio signal of the left front channel (L channel) is output to the speaker 4-2,
and the audio signal of the right front channel (R channel) is The audio signal of the subwoofer
channel (LFE channel) which is output to the speaker 4-3 is output to the speaker 4-4. Also, audio
signals of the left rear channel (RL channel) and the right rear channel (RR channel) are
transmitted to the transmitter 2.
[0019]
Also, in the transmitting device 2, when an audio signal is received from the AV device 1,
depending on the state of the audio signal, between the digital wireless transmission method with
high data communication efficiency and the FM transmission method with low power
consumption, A communication scheme for transmission to the receiving device 3 is selected.
Then, based on the selected communication method, the audio signal is encoded and modulated
and transmitted to the receiving device 3. The receiver 3 demodulates and decodes the signal
transmitted from the transmitter 2, and then extracts audio signals of each of the RL channel and
the RR channel from the audio signal obtained by decoding, and connects the speakers 4 -Send to
5, 4 and 6. That is, the audio signal of the RL channel is output to the speaker 4-5, and the audio
signal of the RR channel is output to the speaker 4-6.
01-05-2019
7
[0020]
Details of the transmitting device 2 and the receiving device 3 in such an audio system will be
described below. First, the configurations of the transmitting device 2 and the receiving device 3
will be described.
[0021]
The transmitting device 2 of FIG. 2 includes an A / D converter 21 for converting an audio signal
to be an analog signal transmitted from the AV device 1 into a digital signal, and a digital signal
from the A / D converter 21 in common with the receiving device 3. The modulation unit 22
performs compression encoding by the compression encoding method and performs digital
modulation by the high-speed digital modulation method common to the receiving apparatus 3,
and the signal digitally modulated by the modulation unit 22 is assigned to the digital wireless
transmission method A frequency converter 23 for generating a radio signal according to a
carrier frequency of a channel, an antenna 24 for transmitting the radio signal generated by the
frequency converter 23, an FM modulator 25 for generating a signal of a specific frequency
modulation pattern, and FM The signal generated by the modulation unit 25 is used to generate
an FM signal according to the carrier frequency of the channel assigned to the FM transmission
method. The FM frequency conversion unit 26, the antenna 27 for transmitting the FM signal
generated by the FM frequency conversion unit 26, the power control unit 28 for controlling ON
/ OFF of the power supply to each block inside the device 2, and the device 2 And a control unit
29 for performing the control operation of
[0022]
Also, the receiving device 3 of FIG. 3 includes an antenna 31 for receiving a wireless signal
transmitted from the transmitting device 2 and a channel selector 32 for selecting a wireless
signal of a channel assigned to the wireless transmission system by the antenna 31. A
demodulator 33 demodulates the radio signal received by the tuner 32 by a common high-speed
digital modulation scheme and decompresses and decodes the radio signal by a common
compression encoding scheme, and an RL channel from the digital signal demodulated by the
demodulator 33. The digital signal extracted by each of the signal extraction units 34a and 34b
for extracting the audio signal of each of the RR channels and the digital signal extracted by each
of the signal extraction units 34a and 34b is converted to an analog signal and is output to the
speakers 4-5 and 4-6 D / A converters 35a and 35b for transmitting, an antenna 36 for receiving
an FM signal transmitted from the transmitter 2, and An FM tuner 37 for tuning an FM signal of
a channel allocated to the FM transmission method in the antenna 36 and an FM demodulator
for demodulating a FM signal tuned by the FM tuner 37 and analyzing a frequency modulation
pattern And 38, a power control unit 39 for controlling ON / OFF of power supply to each block
01-05-2019
8
in the apparatus 3 and a control unit 40 for performing control operation in the apparatus 3.
[0023]
When audio signals of the RL and RR channels are transmitted from the AV device 1 to the
transmission device 2, the control unit 29 confirms the input of the audio signal from the AV
device 1. The converter 21, the modulator 22, and the frequency converter 23 are turned on, and
the FM modulator 25 and the FM frequency converter 26 are turned off.
Therefore, the input audio signal is converted into a digital signal in the A / D converter 21 and is
supplied to the modulator 22.
Then, after the data is compressed into a digital signal, the modulation unit 22 performs
modulation based on a high-speed digital modulation method such as QAM (Quadrature
Amplitude Modulation) or QPSK (Quadrature Phase Shift Keying). When an audio signal
subjected to high-speed digital modulation in this manner is supplied to the frequency
conversion unit 23, it is frequency-converted to the carrier frequency of the channel assigned to
the transmission device 2 to be a radio signal, and transmitted from the antenna 24.
[0024]
When this radio signal is transmitted from the transmitter 2, the radio signal is received at the
receiver 3 which has already performed channel search and confirmed the carrier frequency of
the channel to which the radio signal is transmitted from the transmitter 2. At this time, the
carrier frequency to be selected is set in the tuner 32 so as to receive the radio signal transmitted
from the transmitter 2. Also, the power control unit 39 turns on the tuner 32, the demodulator
33, the signal extractors 34a and 34b, and the D / A converters 35a and 35b by the power
control unit 39 so that the radio signal can be received. The unit 38 is turned off. Therefore,
when a radio signal from the transmission device 2 is received by the antenna 31 and the tuner
32, it is frequency-converted by the tuner 32, and then supplied to the demodulator 33.
[0025]
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9
Then, after demodulation is performed by the high-speed digital modulation method common to
the transmission device 2 in the demodulation unit 33, data expansion is performed, and an
audio signal to be a digital signal is obtained. When the audio signal to be the digital signal is
given to each of the signal extraction units 34a and 34b, the signal extraction unit 34a extracts
the digital signal to be the audio signal of the RL channel, and the signal extraction unit 34b
extracts the audio signal of the RR channel Digital signals are extracted. Then, when an audio
signal of the RL channel to be an analog signal is obtained by the D / A converter 35a, the audio
signal of the RL channel is output to the speaker 4-5 and the audio of the RL channel is output.
Also, when an audio signal of the RR channel to be an analog signal is obtained by the D / A
converter 35b, the audio signal of the RR channel is outputted to the speaker 4-6 and the sound
of the RR channel is outputted.
[0026]
In this manner, audio signals of the RR channel and the RL channel are transmitted from the AV
device 1, and communication by the digital wireless transmission method is performed between
the transmitting device 2 and the receiving device 3. The voice is output from -6. Then, when the
audio signal of the RL channel and the RR channel is not transmitted from the AV device 1, the
control unit 29 confirms that the transmitting device 2 does not receive the input of the audio
signal. Thereafter, when it is confirmed in the control unit 29 that the input of the audio signal is
not continuous for a predetermined time or more, it is determined that there is no output of the
audio signal from the AV device 1.
[0027]
Therefore, the A / D converter 21, the modulation unit 22, and the frequency conversion unit 23
are turned off by the power supply control unit 28, and the FM modulation unit 25 and the FM
frequency conversion unit 26 are turned on. In this way, the transmission operation by the digital
wireless transmission method with high power consumption is stopped, and the transmission
operation by the analog FM transmission method with low power consumption as compared to
the digital wireless transmission method is driven. That is, in order to reduce the time delay of
the audio signal of the RR channel and the RL channel, a large amount of current consumption is
required by performing data compression and high-speed digital modulation in the modulation
unit 22. By stopping the driving of the block by the digital wireless transmission method (the
block by digital operation), the power consumption can be suppressed and the “power saving
mode” can be set.
01-05-2019
10
[0028]
In the "power saving mode" in which the driving of the block (the block by the analog operation)
by the FM transmission method is started, the control unit 29 continues to confirm the presence
or absence of the input of the audio signal from the AV device 1. Then, when the control unit 29
confirms that the audio signal from the AV device 1 is input, a signal of a fixed pattern is
generated by the control unit 29, and the FM modulation is performed by operating the FM
modulation unit 25 according to the fixed pattern. An output start signal is generated. The output
start signal is converted by the FM frequency converter 26 into an FM signal of the carrier
frequency of the channel assigned to the communication by the FM transmission method, and is
transmitted from the antenna 27.
[0029]
Thereafter, the power control unit 28 turns on the A / D converter 21, the modulation unit 22,
and the frequency conversion unit 23, and turns off the FM modulation unit 25 and the FM
frequency conversion unit 26. By doing this, driving of the transmission operation by the digital
wireless transmission method is started again, and the transmission operation by the FM
transmission method is stopped, and an audio signal is transmitted from the "power saving
mode" to the "normal operation mode". Switch.
[0030]
With respect to such a transmitting device 2, in the receiving device 3, in the control unit 40, the
reception intensity at the tuning part 32 or the signal level of any of the input / output signals at
the D / A converters 35 a and 35 b is confirmed. Then, the presence or absence of the audio
signal of RR channel and RL channel is confirmed. Then, when the control unit 40 confirms that
the reception of the audio signal is not continuous for a predetermined time or more, it is
determined that the transmission of the audio signal from the transmission device 2 is not
performed.
[0031]
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11
Therefore, the power control unit 39 turns off the tuner 32, the demodulator 33, the signal
extractors 34a and 34b, and the D / A converters 35a and 35b, and turns on the FM tuner 37
and the FM demodulator 38. In this manner, the reception operation by the digital wireless
transmission method with high power consumption is stopped, and the reception operation by
the analog FM transmission method with low power consumption as compared to the digital
wireless transmission method is driven. That is, as in the transmitter 2, the driving of the block
(the block by the digital operation) by the digital wireless transmission method is stopped, and
the driving of the block by the FM transmission method (the block by analog operation) is
started. It is possible to suppress the power saving mode.
[0032]
As described above, by driving the FM selector 37 and the FM demodulator 38, the presence or
absence of the reception of the output start signal transmitted from the transmitter 2 is
confirmed. At this time, when transmission of audio signals of the RR channel and the RL channel
is resumed from the AV device 1 and an output start signal is transmitted from the transmitter 2,
the output start signal is received by the antenna 36 and the FM tuner 37. Ru. Then, when the
frequency of the received output start signal is converted and given to the FM demodulation unit
38, the FM demodulation is performed to give the control unit 40 a signal having a fixed pattern
given to the output start signal. Be
[0033]
Therefore, it is confirmed that the transmission of the audio signal is resumed by the control unit
40, and the power control unit 39 selects the channel selector 32, the demodulator 33, the signal
extractors 34a and 34b, and the D / A converters 35a and 35b. The FM selector 37 and the FM
demodulator 38 are turned OFF. By doing this, the drive operation of the reception operation by
the digital wireless transmission method is started again, and the reception operation by the FM
transmission method is stopped, and the audio signal is transmitted from the "power saving
mode" to the "normal operation mode". Switch.
[0034]
As described above, in the present embodiment, when each of the transmission device 2 and the
reception device 3 does not confirm reception of a signal for a predetermined time, it is assumed
01-05-2019
12
that there is no output of an audio signal from the AV device 1 and digital wireless transmission
The block according to the system (the block according to the digital operation) is turned off, and
the block according to the FM transmission mode (the block according to the analog operation) is
turned over. By doing this, each of the transmission device 2 and the reception device 3 can shift
its operation state to the “power saving mode” independently, so for example, when the
transmission device 2 is turned off, The receiving device 3 can confirm that there is no
transmission of the audio signal from the transmitting device 2, can shift to the "power saving
mode", and can suppress the power consumption thereof.
[0035]
In the present embodiment, when it is confirmed in the transmitting device 2 that there is no
output of the audio signal from the AV device 1, an output stop signal indicating that the output
of the audio signal is stopped is a digital wireless transmission method. It does not matter as
what is transmitted to the receiver 3. At this time, in the transmitting device 2, a signal of a fixed
pattern indicating that the output of the audio signal is stopped is generated by the control unit
29, and the high speed digital modulated output is stopped by the operation of the modulator 22
according to this fixed pattern. A signal is generated. The output stop signal is converted by the
frequency conversion unit 23 into a radio signal of the carrier frequency of the channel assigned
to the communication by the high-speed digital radio transmission method, and is transmitted
from the antenna 24. Thereafter, the operation state of the transmission device 2 shifts to the
“power saving mode”.
[0036]
On the other hand, when the receiving device 3 receives the output stop signal from the
transmitting device 2 by the antenna 31 and the tuner 32, the received output stop signal is
demodulated by the demodulation unit 33, so that the control unit 40 The fixed pattern by the
output stop signal is confirmed, and it is recognized that there is no output of the audio signal
from the AV device 1, and the operation state is shifted to the "power saving mode". Also, even
when the receiving device 3 confirms that there is no transmission of the wireless signal from the
transmitting device 2 for a predetermined time even when there is no reception of the output
stop signal, there is no output of the audio signal from the AV device 1 It is determined that the
operation status is shifted to the "power saving mode".
[0037]
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13
In the present embodiment, although the transmission device 2 is connected to the AV device 1,
the AV device 1 may include a block having the same function as the transmission device 2.
Similarly, a block having the same function as that of the receiving device 3 may be included in
the speakers 4-5 and 4-6. At this time, one of the speakers 4-5 and 4-6 has the same function as
the receiving device 3, and an audio signal is transmitted to the other speaker.
[0038]
Further, in the present embodiment, when the power is turned on after the power of the
transmitting device 2 is turned off, the FM modulating unit 25 and the FM frequency converting
unit 26 are operated regardless of the presence or absence of the audio signal from the AV
device 1. Alternatively, the output start signal may be transmitted to the receiver 3 as an FM
signal. At this time, in the receiving device 3, the antenna 36, the FM selector 37, and the FM
demodulator 38 receive the output start signal, which is an FM signal, so that the "normal mode"
is selected. It is possible to turn on the power supply of the block) and to turn off the power
supply of the block by the FM transmission method (block by analog operation). At this time,
after transmitting the output start signal to be the FM signal, the transmission device 2 turns off
the block according to the FM transmission method (the block according to the analog
operation).
[0039]
Furthermore, in the present embodiment, audio signals of the RL channel and the RR channel are
transmitted from the transmitter 2 to the receiver 3, the audio signals of the RL channel and the
RR channel are divided, and the receiver 3 to the speaker 4-5, Although the information is
distributed to 4 to 6 and given, it may be connected to each of the speakers 4-5 and 4-6 with a
receiving device having the same function as the receiving device 3. At this time, by performing
digital wireless communication on another channel to the receiving device 3 connected to each of
the speakers 4-5 and 4-6, an audio signal is transmitted and FM communication on the same
channel is performed. It can be realized by being
[0040]
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14
When different channels are used in digital wireless communication, the channels may be
different depending on time division, the channels may be different depending on codes, or the
channels may be different depending on the carrier frequency. Further, at this time, not only the
audio signals of the RL channel and the RR channel, but also the audio signals of the C channel,
the L channel, the R channel, and the LFE channel are transmitted, respectively. A receiver may
be connected. Also, each speaker may include a block having the same function as that of the
receiving device 3.
[0041]
Furthermore, with regard to the presence or absence of an audio signal serving as a reference for
switching between the “power saving mode” and the “normal mode”, in the transmitting
device 2, the signal level of one of the input / output signals of the A / D converter 21 is On the
basis of this, in the receiving device 3, it may be based on the signal level of any one of the input
and output signals of the D / A converters 35a and 35b. That is, when the magnitude of the
signal level of the audio signal from the AV device 1 is larger than the predetermined value, it is
determined that the audio signal is present, and the transmission device 2 and the reception
device are set to perform communication by the digital wireless transmission method. The blocks
in which 3 is in the “normal mode” are driven by the power control units 28 and 39,
respectively. On the other hand, when the magnitude of the signal level of the audio signal from
the AV device 1 becomes equal to or less than a predetermined value, it is determined that there
is no audio signal, and the transmitter 2 and the receiver The blocks whose 3 is in the “power
saving mode” are driven by the power control units 28 and 39 respectively.
[0042]
The present invention is applicable to an audio system such as a surround system or a Dolby
system that performs audio output with a plurality of speakers that perform 5.1 channel or 7.1
channel audio output.
[0043]
FIG. 1 is a block diagram showing the configuration of an audio system according to an
embodiment of the present invention.
These are block diagrams which show the internal structure of the transmitter in the audio
01-05-2019
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system of FIG. These are block diagrams which show the internal structure of the receiver in the
audio system of FIG.
Explanation of sign
[0044]
DESCRIPTION OF SYMBOLS 1 AV apparatus 2 Transmission device 3 Reception device 4-1 to 4-6
Speaker 21 A / D converter 22 Modulation unit 23 Frequency conversion unit 24 Antenna 25
FM modulation unit 26 FM frequency conversion unit 27 Antenna 28 Power control unit 29
Control unit 31 Antenna 32 Tuner 33 Demodulator 34a, 34b Signal extractor 35a, 35b D / A
converter 36 Antenna 37 FM tuner 38 FM demodulator 39 Power controller 40 Controller
01-05-2019
16
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