JPH05122789

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DESCRIPTION JPH05122789
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wireless headphone / surround system for outputting audio and the like from headphones and
surround speakers wirelessly.
[0002]
2. Description of the Related Art In recent years, a number of devices equipped with a surround
function are on the market, and accordingly, such devices are becoming well used.
[0003]
FIG. 10 is a block diagram showing an example of a television apparatus provided with such a
surround function.
[0004]
The television apparatus shown in this figure is disposed at the television receiver 101 disposed
in front of the viewer, the surround LCH speaker 102 disposed at the left rear of the viewer, and
at the right rear of the viewer A front LCH speaker 105 provided in the television receiver 101,
which is provided with a surround RCH speaker 103 and displays an image on a cathode ray
tube 104 provided in the television receiver 101; A surround LCH speaker 102 for outputting
LCH audio and RCH audio from the RCH speaker 106 and a speaker cord 107 connected to the
surround speaker terminal of the television receiver 101, and surround Surround LCH audio
from RCH speaker 103 and And it outputs the surround RCH voice.
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[0005]
Also, in recent years, television devices have been developed that use a wireless transmitter to
emit sound from headphones.
[0006]
FIG. 11 is a block diagram showing an example of a television apparatus provided with such a
wireless transmission function.
[0007]
The television apparatus shown in this figure includes a television receiver 110 and a wireless
headphone 111. When the wireless function is not selected, the television receiver 110 displays
an image while the television receiver 110 displays the image. The LCH audio and the RCH audio
are output from 110, and when the wireless function is selected, the television receiver 110
transmits an audio signal wirelessly while displaying an image by the television receiver 110. The
wireless headphone 111 receives the signal, and the wireless headphone 111 outputs the LCH
sound and the RCH sound.
[0008]
In this case, when the video signal is supplied, the television receiver 110 takes in an audio signal
supplied to the input terminals 113 and 114 when the CRT 112 displays the screen and the
built-in speaker is set by the user. This is output from the built-in speaker terminals 115 and
116, and when the wireless headphone side is selected by the user, the audio signal supplied to
the input terminals 113 and 114 is taken and output from the wireless terminals 117 and 118.
When the LCH audio signal is output from the switch 119 and the built-in speaker terminal 115
of the switch 119, the LCH audio amplifier circuit 120 takes in and amplifies the LCH audio
signal, and the LCH audio signal from the LCH audio amplifier circuit 120 When is output, And
an RCH audio amplifier circuit 122 for capturing and amplifying an RCH audio signal when the
RCH audio signal is output from the built-in speaker terminal 116 of the changeover switch 119,
and for this RCH. When an RCH audio signal is output from the audio amplifier circuit 122, an
LCH audio signal and an RCH audio signal are output from the RCH speaker 123 which captures
this and outputs it as RCH audio, and the wireless terminals 117 and 118 of the changeover
switch 119. Wireless modulation circuit 124 which takes in and modulates them to generate a
transmission signal, a drive amplifier circuit 125 which takes in and amplifies the transmission
signal output from the wireless modulation circuit 124, and the drive amplifier circuit Send from
125 And a infrared LED126 for converting the optical signal takes in the signal.
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[0009]
When the user operates the changeover switch 119 and the built-in speaker side is selected, the
LCH audio signal and the RCH audio signal are taken in by the changeover switch 119 and the
LCH amplifier circuit 120 is displayed while displaying an image by the CRT 112. After being
supplied to and amplified by the RCH amplifier circuit 122, the LCH speaker 121 and the RCH
speaker 123 output LCH audio and RCH audio.
[0010]
Further, when the user operates the changeover switch 119 and the wireless side is selected, the
LCH audio signal and the RCH audio signal are taken in by the changeover switch 119 and
supplied to the wireless modulation circuit 124 while displaying an image by the CRT 112 After
modulation, the signal is amplified by the drive amplifier circuit 125 and converted into a light
signal by the infrared LED 126 for transmission.
[0011]
In addition, the wireless headphone 111 is fixed to one end of the bridge arm 130 formed of an
elastic member formed in a “U” shape and one end of the bridge arm 130, and light
transmitted from the infrared LED 126 of the television receiver 110 An infrared receiver 131
for receiving and demodulating a signal, an LCH speaker 132 fixed to one end of the bridge arm
130, capturing an LCH audio signal output from the infrared receiver 131 and outputting it as
voice; The RCH speaker 133 takes in the RCH audio signal output from the infrared receiver 131
and outputs it as voice, receives and demodulates the optical signal transmitted from the infrared
LED 126 of the television receiver 110. , LCH voice signal obtained by this demodulation
operation, and R And H speech signal LCH speaker 132, and outputs the RCH speaker 133 LCH
voice, as RCH speech.
[0012]
However, the above-mentioned conventional television apparatus has the following problems.
[0013]
First, in the television apparatus shown in FIG. 10, since the television receiver 101, the surround
LCH speaker 102 and the surround RCH speaker 103 have to be connected by the speaker code
107, the speaker code 107 becomes an obstacle. It will
[0014]
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Therefore, many users remove the surround LCH speaker 102 and the surround RCH speaker
103 from the television apparatus 101 and do not use the surround LCH speaker 102 and the
surround RCH speaker 103.
[0015]
Also, in the television apparatus shown in FIG. 11, although an audio signal can be transmitted
wirelessly from the television receiver 110 to the wireless headphones 111, a surround of the
television receiver 110 that constitutes this television apparatus can be obtained. When an LCH
speaker for surround or an RCH speaker for surround is connected, the long speaker cord 107
must be used as in the case of the television apparatus 101 shown in FIG. There is a risk that the
LCH speakers for surround and the RCH speakers for surround will not be used.
[0016]
In view of the above circumstances, the present invention sends surround LCH audio signals and
surround RCH audio signals to surround LCH speakers and surround RCH speakers without
using a long speaker code to output surround LCH audio and surround RCH audio. It is an object
of the present invention to provide a wireless headphone / surround system capable of
transmitting LCH audio signals and RCH audio signals to wireless headphones and outputting
LCH audio and RCH audio.
[0017]
SUMMARY OF THE INVENTION In order to achieve the above object, a wireless headphone /
surround system according to the present invention is provided on an AV device having a front
signal and a surround signal inside, and the AV device side. A selection circuit for taking in the
front signal and supplying it to a device main body speaker or a speaker connected to the device
main body and outputting the signal when the two-channel mode or surround mode is set, and
the AV device side. A switching circuit which selects the surround signal when the surround
mode is set, takes in and outputs the signal, and selects the front signal when the wireless
headphone mode is set, takes the signal and outputs it, and Provided on the side of the AV
device, and the signal output from the switching circuit is A wireless transmitter for converting
the radio signal into a radio signal and transmitting the same, and a wireless headphone installed
apart from the wireless transmitter for capturing and reproducing a front signal output from the
wireless transmitter in the form of a radio signal, A wireless transmitter and a surround speaker
are provided separately from the wireless transmitter, for capturing and reproducing a surround
signal output from the wireless transmitter in the form of a wireless signal.
[0018]
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In the above configuration, when the AV device is operated and the 2-channel mode is selected,
the front audio is output from the speaker provided in the AV device or the speaker connected to
the AV device here, When the wireless headphone mode is selected, the front audio is converted
into an optical signal by the AV device and transmitted to the wireless headphone for
reproduction. When the surround mode is selected, the AV device is provided. The front sound is
output from the speaker or the speaker connected to the AV apparatus here, and the surround
sound signal is converted into an optical signal by the AV device and transmitted to the surround
speaker for reproduction.
[0019]
FIG. 1 is a block diagram showing a basic embodiment of a wireless headphone / surround
system according to the present invention.
[0020]
The wireless headphone / surround system shown in this figure includes the AV device 1, the
wireless headphone 2, the surround LCH speaker 3, and the surround RCH speaker 4, and the AV
device 1 is operated to select the 2-channel mode. When it is set, the LCH sound and the RCH
sound are respectively outputted from the front LCH speaker and the front RCH speaker
provided in the AV apparatus 1.
Also, when the wireless headphone mode is selected, the AV device 1 converts the LCH audio
signal and the RCH audio signal into optical signals and transmits them to the wireless
headphone 2 for reproduction, and the surround mode is selected. When the LCH audio signal
and the RCH audio signal are supplied to the front LCH speaker and the front RCH speaker by
the AV apparatus 1 and reproduced, the surround LCH audio signal and the surround RCH audio
signal are supplied. The light signal is converted and transmitted to the surround LCH speaker 3
and the surround RCH speaker 4 for reproduction.
[0021]
The AV device 1 includes the surround signal processing circuit 5, the changeover switch 6, and
the wireless transmitter 7. When the AV device 1 is operated and the 2-channel mode is selected,
the front LCH speaker and the front RCH are selected. LCH audio and RCH audio are respectively
output from the speaker, and when the wireless headphone mode is selected, the LCH audio
signal and the RCH audio signal are converted into an optical signal and this is converted to the
wireless headphone 2 When the surround mode is selected, the LCH audio signal and the RCH
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audio signal are supplied to the front LCH speaker and the front RCH speaker and reproduced,
and the surround LCH audio signal is transmitted. , Surround RCH audio signal into an optical
signal, and Round for LCH speaker 3, is reproduced and transmitted to the surround for RCH
speaker 4.
[0022]
When the two-channel mode is selected, the surround signal processing circuit 5 takes in the
LCH audio signal and the RCH audio signal and causes the front LCH speaker and the front RCH
speaker to output LCH audio and RCH audio, When the wireless headphone mode is selected, the
LCH audio signal and the RCH audio signal are captured and supplied to the changeover switch
6, and when the surround mode is selected, the LCH audio signal and the RCH audio signal are
captured. These signals are processed to generate an LCH audio signal, an RCH audio signal, a
surround LCH audio signal, and a surround RCH audio signal, which are supplied to the
changeover switch 6.
[0023]
The changeover switch 6 is a switch set to either the 2-channel mode, the wireless headphone
mode, or the surround mode in accordance with the setting contents of the user, and is output
from the surround signal processing circuit 5 when the 2-channel mode is set. Stop the
acquisition of the LCH audio signal and RCH audio signal, and when the wireless headphone
mode is set, acquire the LCH audio signal output from the surround signal processing circuit 5
and the RCH audio signal and When supplied to the wireless transmitter 7 and the surround
mode is set, the surround LCH audio signal output from the surround signal processing circuit 5
and the surround RCH audio signal are captured and supplied to the wireless transmitter 7 Do.
[0024]
The wireless transmitter 7 takes in the LCH audio signal or RCH audio signal (or surround LCH
audio signal or surround RCH audio signal) output from the changeover switch 6 when the
wireless headphone mode or the surround mode is set, and It is equipped with a wireless
modulation circuit that modulates these to generate a transmission signal, and an infrared LED
that takes in the transmission signal output from this wireless modulation circuit and converts it
into an optical signal, and the wireless headphone mode and surround mode are set. When it is
switched on, the LCH audio signal or RCH audio signal (or surround LCH audio signal or
surround RCH audio signal) output from the changeover switch 6 is taken in and modulated to
generate a transmission signal, and this transmission signal is generated. Converted to optical
signal And it transmits to the wireless headphone 2, and transmits to the surround for LCH
speaker 3 and a surround for RCH speaker 4.
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[0025]
In this case, when the surround LCH audio signal or the surround RCH audio signal is supplied
from the changeover switch 6, the wireless transmitter 7 modulates the surround LCH audio
signal or the surround RCH audio signal as shown in FIG. After generating surround pilot signals
of a frequency shifted from the frequency band of the audio signal area 10 while converting into
10, these are converted into optical signals and transmitted to the surround LCH speaker 3 and
the surround RCH speaker 4 When the LCH audio signal and the RCH audio signal are supplied
from the changeover switch 6, these LCH audio signal and RCH audio signal are modulated to
enter the audio signal area 10 as shown in FIG. Into an optical signal and send it to the wireless
headphones 2.
[0026]
Each of the surround LCH speaker 3 and the surround RCH speaker 4 includes a housing 11, a
receiver 12, and a speaker 13. When the wireless transmitter 7 transmits an optical signal, the
optical signal is transmitted When a surround pilot signal is obtained by this reception operation,
the light signal is demodulated to reproduce the surround LCH audio signal and the surround
RCH audio signal, and these are output from the speaker 13 as audio.
[0027]
The housing 11 is constituted by a rectangular box disposed behind the viewer, and the receiver
12 is disposed therein, and the speaker 13 is fitted in an opening formed in the front.
[0028]
The receiver 12 includes a receiving circuit 14, a band pass filter circuit (BPF) 15, a pilot signal
detection circuit 16, an audio signal demodulation circuit 17, and an audio amplifier circuit 18,
as shown in FIG. When an optical signal is transmitted from the wireless transmitter 7, this
optical signal is received, and when a surround pilot signal is obtained by this reception
operation, the optical signal is demodulated to convert the surround LCH audio signal or the
surround RCH audio signal. It reproduces and supplies these to the speaker 13.
[0029]
The receiving circuit 14 receives an optical signal transmitted from the wireless transmitter 7 to
generate an RF signal, and supplies the RF signal to a band pass filter circuit 15 and an audio
signal demodulation circuit 17.
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[0030]
When an RF signal is output from the receiving circuit 14, the band pass filter circuit 15 takes
this signal and performs band pass processing to extract a component (surround pilot signal
component) of a frequency band set in advance and output it as a pilot. The signal detection
circuit 16 is supplied.
[0031]
The pilot signal detection circuit 16 takes in the signal output from the band pass filter circuit 15
and checks whether it contains a surround pilot signal and generates a surround on signal when
it contains a surround pilot signal, This is supplied to the audio signal demodulation circuit 17
and the audio amplifier circuit 18.
[0032]
When the surround on signal is output from the pilot signal detection circuit 16, the audio signal
demodulation circuit 17 demodulates the RF signal output from the reception circuit 14 and
designates it among the surround LCH audio signal and the surround RCH audio signal. The
reproduced signal is reproduced and supplied to the audio amplifier circuit 18.
[0033]
The audio amplifier circuit 18 takes in and amplifies the surround LCH audio signal (or surround
RCH audio signal) output from the audio signal demodulation circuit 17 when the surround on
signal is output from the pilot signal detection circuit 16 Then, the speaker 13 is supplied.
[0034]
When the surround LCH audio signal (or surround RCH audio signal) is output from the audio
amplifier circuit 18, the speaker 13 takes in this signal, converts it into audio, and outputs it.
[0035]
In addition, the wireless headphone 2 is fixed to one end of the bridge arm 20 formed of an
elastic member formed in a “U” shape and one end of the bridge arm 20, and light transmitted
from the wireless transmitter 7 of the AV device 1 A receiver 21 for receiving and demodulating
a signal, an LCH speaker 22 fixed to one end of the bridge arm 20, capturing an LCH audio signal
output from the receiver 21 and outputting it as voice, the reception And an RCH speaker 23 for
capturing an RCH audio signal output from the recorder 21 and outputting it as a voice, and
receiving and demodulating an optical signal transmitted from the wireless transmitter 7 of the
AV device 1; If the LCH audio signal obtained by this demodulation operation and the RCH audio
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signal are the LCH speaker 22 and the RCH speaker 23 And LCH voice, and outputs it as RCH
voice.
[0036]
In this case, as shown in FIG. 4, the receiver 21 includes a receiving circuit 25, a band pass filter
circuit (BPF) 26, a pilot signal detection circuit 27, an audio signal demodulation circuit 28, and
audio amplifier circuits 29, 30. When an optical signal is transmitted from the wireless
transmitter 7, the optical signal is received, and when a surround pilot signal can not be obtained
by this reception operation, the optical signal is demodulated to obtain an LCH audio signal or
the like. The RCH audio signal is reproduced, and is supplied to the LCH speaker 22 and the RCH
speaker 23 to be output as sound.
[0037]
The receiving circuit 25 receives an optical signal transmitted from the wireless transmitter 7 to
generate an RF signal, and supplies the RF signal to a band pass filter circuit 26 and an audio
signal demodulation circuit 28.
[0038]
When an RF signal is output from the receiving circuit 25, the band pass filter circuit 26 takes it
in and performs band pass processing to extract a component (surround pilot signal component)
of a preset frequency band, The signal is supplied to a pilot signal detection circuit 27.
[0039]
The pilot signal detection circuit 27 checks whether or not there is a surround pilot signal in the
signal extracted by the band pass filter circuit 26. When the surround pilot signal is not present,
an on signal is generated to generate an audio signal demodulation circuit. 28 and the audio
amplifier circuits 29 and 30.
[0040]
When the ON signal is output from the pilot signal detection circuit 27, the audio signal
demodulation circuit 28 demodulates the RF signal output from the reception circuit 25 to
reproduce the LCH audio signal and the RCH audio signal, and this is used for audio Each of the
amplifier circuits 29 and 30 is supplied.
[0041]
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Each of the audio amplifier circuits 29 and 30 receives and amplifies the LCH audio signal and
RCH audio signal output from the audio signal demodulation circuit 28 when the on signal is
output from the pilot signal detection circuit 27. Then, the signal is supplied to the LCH speaker
22 and the RCH speaker 23 and output as sound.
[0042]
Thus, in this embodiment, when the AV device 1 is operated and the 2-channel mode is selected,
LCH audio and RCH from the front LCH speaker and the front RCH speaker provided in the AV
device 1 are used. When the wireless headphone mode is selected, the AV device 1 converts the
LCH audio signal and the RCH audio signal into optical signals and transmits them to the wireless
headphones 2 for reproduction. When the surround mode is selected, the AV device 1 supplies
an LCH audio signal and an RCH audio signal to the front LCH speaker and the front RCH
speaker to reproduce the same and a surround LCH audio signal. Convert surround RCH audio
signals into optical signals Since the surround LCH speaker 3 and the surround RCH speaker 4
are transmitted and reproduced, the surround LCH audio signal and the surround LCH speaker 3
and the surround RCH speaker 4 are used without using a long speaker code. The RCH audio
signal can be sent and reproduced, or the LCH audio signal and the RCH audio signal can be sent
to the wireless headphone 2 and reproduced.
[0043]
FIG. 5 is a block diagram showing an embodiment when the wireless headphone / surround
system according to the present invention is applied to a television apparatus.
[0044]
The wireless headphone / surround system shown in this figure includes a television receiver 35,
a wireless headphone 36, a surround LCH speaker 37, and a surround RCH speaker 38, and the
television receiver 35 is operated 2 When the channel mode is selected, the LCH speaker 39 and
the RCH speaker 40 provided in the television receiver 35 respectively output LCH audio and
RCH audio.
Further, when the wireless headphone mode is selected, the television receiver 35 converts the
LCH audio signal and the RCH audio signal into an optical signal and transmits it to the wireless
headphone 36 to reproduce it, and the surround mode is also performed. When is selected, the
television receiver 35 supplies LCH audio and RCH audio to the LCH speaker 39 and the RCH
speaker 40 to reproduce them, and surround LCH audio signals and surround RCH audio signals.
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The light signal is converted and transmitted to the surround LCH speaker 37 and the surround
RCH speaker 38 for reproduction.
[0045]
The television receiver 35 includes a surround signal processing circuit 41, a changeover switch
42, a mute circuit 43, two audio amplifier circuits 44 and 45, an LCH speaker 39, an RCH
speaker 40, a wireless transmitter 46, and a system. A microcomputer 47 for control is provided,
and when the television receiver 35 is operated and the 2-channel mode is selected, LCH audio
and RCH audio are respectively output from the LCH speaker 39 and the RCH speaker 40. When
the wireless headphone mode is selected, the LCH audio signal and the RCH audio signal are
converted into light signals, which are transmitted to the wireless headphone 36 for
reproduction, and the surround mode is selected. Sometimes, the LCH audio signal and the RCH
audio signal The LCH speaker 39 and the RCH speaker 40 are supplied to reproduce the same,
and the surround LCH audio signal and the surround RCH audio signal are converted into light
signals and the surround LCH speaker 37 and the surround RCH speaker 38. Send to and play.
[0046]
When the two-channel mode command or the wireless headphone mode command is supplied,
the surround signal processing circuit 41 takes in the LCH audio signal and the RCH audio signal
and supplies them to the mute circuit 43 and the changeover switch 42, and the microcomputer
When the surround mode command is supplied from 47, the LCH audio signal and the RCH audio
signal are taken in, and these are processed to process the LCH audio signal, the RCH audio
signal, the surround LCH audio signal, and the surround RCH audio signal And is supplied to the
mute circuit 43 and the changeover switch 42.
[0047]
The mute circuit 43 takes in the LCH audio signal output from the surround signal processing
circuit 41 and the RCH audio signal, and when the microcomputer 47 does not output a 2channel mode command or a surround mode command, these LCH audio signals are output.
When the output of the signal and the RCH audio signal is stopped and the 2-channel mode
command or the surround mode command is output from the microcomputer 47, the LCH audio
signal and the RCH audio signal are output and these audio amplifier circuits are output. Supply
to 44, 45 respectively.
[0048]
Each of the audio amplifier circuits 44 and 45 takes in the LCH audio signal output from the
mute circuit 43 and the RCH audio signal, amplifies them, and then supplies them to the LCH
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speaker 39 and the RCH speaker 40 respectively. .
[0049]
Each of the LCH speaker 39 and the RCH speaker 40 is provided on the front face of a housing
constituting the television receiver 35, and each of the audio amplifier circuits 44 and 45 outputs
an LCH audio signal and an RCH audio signal. When it does, these are taken in and output as a
sound.
[0050]
Further, the changeover switch 42 is a switch set to either the 2-channel mode, the wireless
headphone mode, or the surround mode in accordance with an instruction from the
microcomputer 47, and the surround signal is selected when the 2-channel mode is set. Stops
capturing the LCH audio signal and RCH audio signal output from the processing circuit 41, and
when the wireless headphone mode is set, captures the LCH audio signal and RCH audio signal
output from the surround signal processing circuit 41. This is supplied to the wireless
transmitter 46, and when the surround mode is set, the surround LCH audio signal output from
the surround signal processing circuit 41 and the surround RCH audio signal are captured and
transmitted wirelessly It supplies it to the 46.
[0051]
When wireless headphone mode command or surround mode command is output from the
microcomputer 47, the wireless transmitter 46 outputs LCH audio signal or RCH audio signal (or
surround LCH audio signal or surround RCH) output from the changeover switch 42. A wireless
modulation circuit for capturing an audio signal and modulating the same to generate a
transmission signal, and an infrared LED for capturing a transmission signal output from the
wireless modulation circuit and converting the signal into an optical signal; When wireless
headphone mode command or surround mode command is output from the microcomputer 47,
LCH audio signal or RCH audio signal output from the changeover switch 42 (or surround LCH
audio signal or surround RCH audio signal ) And modulate it to generate a transmission signal,
and then convert this transmission signal to an optical signal and transmit it to the wireless
headphone 36, or to the surround LCH speaker 37 or the surround RCH speaker 38. Send
[0052]
In this case, when the surround LCH audio signal or the surround RCH audio signal is supplied
from the changeover switch 42, the wireless transmitter 46 modulates the surround LCH audio
signal or the surround RCH audio signal to set in advance an audio signal area. And generate
surround pilot signals of a frequency shifted from the frequency band of the audio signal area,
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convert them into optical signals, and transmit them to the surround LCH speaker 37 or the
surround RCH speaker 38, When the LCH audio signal or RCH audio signal is supplied from the
changeover switch 42, the LCH audio signal or RCH audio signal is modulated to enter the audio
signal area, and then converted into an optical signal. Send to wireless headphones 36.
[0053]
The microcomputer 47 is a part for controlling each part of the television receiver 35 based on
the setting contents of the user, and the surround signal processing circuit 41, the mute circuit
43, the changeover switch 42, and the wireless based on the setting contents of the user. The
transmitter 46 and the like are controlled to operate them in one of the 2-channel mode, the
wireless headphone mode and the surround mode.
[0054]
Each of the surround LCH speaker 37 and the surround RCH speaker 38 includes a housing 50, a
receiver 51, and a speaker 52, and when an optical signal is transmitted from the wireless
transmitter 46, this light is transmitted. A signal is received, and when a surround pilot signal is
obtained by this reception operation, the light signal is demodulated to reproduce a surround
LCH audio signal or a surround RCH audio signal, and this is output from the speaker 52 as
audio.
[0055]
The housing 50 is constituted by a rectangular box disposed behind the viewer, and the receiver
51 is disposed therein, and the speaker 52 is fitted in the opening formed in the front.
[0056]
In this case, the receiver 51 includes a receiving circuit for receiving an optical signal, and a band
pass filter circuit for extracting a preset frequency component (surround pilot signal component)
from an RF signal obtained by the receiving operation of the receiving circuit. When a surround
pilot signal is included in the signal extracted by the band pass filter circuit, a pilot signal
detection circuit that detects this and generates a surround on signal, and a surround on signal
from the pilot signal detection circuit An audio signal demodulation circuit that demodulates an
RF signal obtained by the reception operation of the reception circuit when being output, and a
surround LCH audio signal or a surround RCH audio signal obtained by the demodulation
operation of the audio signal demodulation circuit And an audio amplifier circuit for amplifying
When an optical signal is transmitted from the less transmitter 46, the optical signal is received,
and when a surround pilot signal is obtained by this reception operation, the optical signal is
demodulated to convert the surround LCH audio signal or the surround RCH audio signal. It
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reproduces and supplies these to the speaker 52 to output as sound.
[0057]
Also, the wireless headphone 36 is fixed to one end of the bridge arm 55 formed of an elastic
member formed in a "U" shape and one end of the bridge arm 55, and transmitted from the
wireless transmitter 46 of the television receiver 35. A receiver 56 for receiving and
demodulating an optical signal, an LCH speaker 57 fixed to one end of the bridge arm 55,
capturing an LCH audio signal output from the receiver 56 and outputting it as voice; And an
RCH speaker 58 which receives the RCH audio signal output from the receiver 56 and outputs it
as voice, and receives and demodulates the optical signal transmitted from the wireless
transmitter 46 of the television receiver 35. The LCH audio signal obtained by this demodulation
operation and the RCH audio signal are RCH speaker 58 and the feed to LCH sound from these
LCH speaker 57, RCH speaker 58, and outputs the RCH audio.
[0058]
In this case, the receiver 56 is a receiving circuit for receiving an optical signal, and a band pass
filter circuit for extracting a frequency component (surround pilot signal component) set in
advance from an RF signal obtained by the receiving operation of the receiving circuit. And a
pilot signal detection circuit that detects an on signal when the signal extracted by the band pass
filter circuit does not include a surround pilot signal and generates an on signal, and the on
signal is output from the pilot signal detection circuit. Audio signal demodulation circuit that
demodulates the RF signal obtained by the reception operation of the reception circuit, LCH
audio signal obtained by the demodulation operation of the audio signal demodulation circuit,
and RCH audio signal And two audio amplifier circuits for amplification, and the optical signal
from the wireless transmitter 46 is When received, when this optical signal is received and a
surround pilot signal can not be obtained, the optical signal is demodulated to reproduce an LCH
audio signal or an RCH audio signal, and this is used as an LCH speaker 57 and an RCH speaker
Output from 58 as voice.
[0059]
As described above, in this embodiment, when the television receiver 35 is operated and the 2channel mode is selected, the LCH speaker 39 provided in the television receiver 35 and the LCH
audio from the RCH speaker 40, When the wireless headphone mode is selected, the television
receiver 35 converts the LCH audio signal and the RCH audio signal into an optical signal and
transmits it to the wireless headphone 36. When the surround mode is selected, the television
receiver 35 supplies an LCH audio signal and an RCH audio signal to the LCH speaker 39 and the
RCH speaker 40 to reproduce the same and surround LCH. Audio signal and surround RCH audio
signal Since the light signal is converted and transmitted to the surround LCH speaker 37 and
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the surround RCH speaker 38 for reproduction, the surround signal is not used as in the abovedescribed basic embodiment. The surround LCH audio signal or the surround RCH audio signal
can be sent to the LCH speaker 37 for surround or the RCH speaker 38 for surround to be
reproduced, or the LCH audio signal or RCH audio signal can be transmitted to be reproduced to
the wireless headphone 36 .
[0060]
FIG. 6 is a block diagram showing an embodiment when the wireless headphone / surround
system according to the present invention is applied to a VCR apparatus.
[0061]
The wireless headphone / surround system shown in this figure includes a VCR device 60, an
audio amplifier device 61, a wireless headphone 62, a surround LCH speaker 63, and a surround
RCH speaker 64. When selected, LCH audio and RCH audio are output from the LCH speaker 67
and the RCH speaker 68 of the audio amplifier device 61 connected to the VCR device 60,
respectively.
Also, when the wireless headphone mode is selected, the VCR device 60 converts the LCH audio
signal and the RCH audio signal into optical signals and transmits them to the wireless
headphone 62 for reproduction, and the surround mode is selected. When the LCR audio signal
and the RCH audio signal are supplied to the LCH speaker 67 and the RCH speaker 68 by the
VCR device 60 and reproduced, the surround LCH audio signal and the surround RCH audio
signal are supplied. The light signal is converted and transmitted to the surround LCH speaker
63 and the surround RCH speaker 64 for reproduction.
[0062]
The VCR device 60 includes a surround signal processing circuit 69, a changeover switch 70, a
mute circuit 71, a wireless transmitter 72, and a microcomputer 73 for system control, and a 2channel mode is selected by the user. Sometimes, LCH audio and RCH audio are output from LCH
speaker 67 of audio amplifier device 61 and RCH speaker 68 connected by cord 65, respectively,
and when wireless headphone mode is selected, LCH audio is output. A signal and an RCH audio
signal are converted to an optical signal and transmitted to the wireless headphone 62 for
reproduction. When the surround mode is selected, the LCH audio signal and the RCH audio
signal are transmitted to an LCH speaker 67. And RCH speaker 68 Is supplied to together to
reproduce it, and surround LCH audio signal, converts the surround RCH audio signal into an
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optical signal and a surround for LCH speaker 63 to reproduce and transmit to and surround for
RCH speaker 64.
[0063]
When the 2-channel mode command and the wireless headphone mode command are supplied
from the microcomputer 73, the surround signal processing circuit 69 takes in the LCH audio
signal and the RCH audio signal and supplies them to the mute circuit 71 and the changeover
switch 70. When the surround processing command is supplied from the microcomputer 73, the
LCH audio signal and the RCH audio signal are taken in, and these are processed to process the
LCH audio signal, the RCH audio signal, and the surround LCH audio signal. , Surround RCH
audio signal, and supplies this to the changeover switch 70.
[0064]
The mute circuit 71 takes in the LCH audio signal output from the surround signal processing
circuit 69 and the RCH audio signal, and when the microcomputer 73 does not output a twochannel mode command or a surround mode command, these LCH audio signals are output.
When the output of the signal and the RCH audio signal is stopped and the 2-channel mode
command or the surround mode command is output from the microcomputer 73, the LCH audio
signal, the RCH audio signal, and the audio output terminals 74 and 75 are output. To the audio
device 61.
[0065]
The audio device 61 comprises an audio amplifier circuit 66 for amplifying an LCH audio signal
supplied via the cord 65 connected to the audio output terminals 74 and 75 and an RCH audio
signal, and an audio amplifier circuit 66 for outputting the audio signal. And an RCH speaker 68
for converting an RCH audio signal output from the audio amplifier circuit 66 into an audio
signal and outputting the audio signal. When the LCH audio signal and the RCH audio signal are
output from the audio output terminals 74 and 75, the LCH audio signal is taken in and
amplified, and is output as audio from the LCH speaker 67 and the RCH speaker 68.
[0066]
Further, the changeover switch 70 is a switch set to either the 2-channel mode, the wireless
headphone mode, or the surround mode in accordance with an instruction from the
microcomputer 73, and the surround signal is selected when the 2-channel mode is set. Stops
capturing the LCH audio signal and RCH audio signal output from the processing circuit 69, and
when the wireless headphone mode is set, imports the LCH audio signal and RCH audio signal
output from the surround signal processing circuit 69. This is supplied to the wireless
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transmitter 72, and when the surround mode is set, the surround LCH audio signal output from
the surround signal processing circuit 69 and the surround RCH audio signal are captured and
transmitted wirelessly It supplies it to the 72.
[0067]
When wireless headphone mode command or surround mode command is output from the
microcomputer 73, the wireless transmitter 72 outputs LCH audio signal or RCH audio signal (or
surround LCH audio signal or surround RCH) output from the changeover switch 70. A wireless
modulation circuit for capturing an audio signal and modulating the same to generate a
transmission signal, and an infrared LED for capturing a transmission signal output from the
wireless modulation circuit and converting the signal into an optical signal; When wireless
headphone mode command or surround mode command is output from the microcomputer 73,
LCH audio signal or RCH audio signal output from the changeover switch 70 (or surround LCH
audio signal or surround RCH audio signal ) And modulate it to generate a transmission signal,
and then convert this transmission signal to an optical signal and transmit it to the wireless
headphone 62, or the surround LCH speaker 63 or the surround RCH speaker 64. Send to
[0068]
In this case, when the surround LCH audio signal or the surround RCH audio signal is supplied
from the changeover switch 70, the wireless transmitter 62 modulates the surround LCH audio
signal or the surround RCH audio signal to set in advance an audio signal area. And generate
surround pilot signals of a frequency shifted from the frequency band of the audio signal area,
convert them into optical signals and transmit them to the surround LCH speaker 63 or the
surround RCH speaker 64, When the LCH audio signal or RCH audio signal is supplied from the
changeover switch 70, the LCH audio signal or RCH audio signal is modulated to enter the audio
signal area, and then converted into an optical signal. Transmit to wireless headphones 62.
[0069]
The microcomputer 73 controls each part of the VCR device 60 based on the setting content of
the user, and the surround signal processing circuit 69, the mute circuit 71, the changeover
switch 70, and the wireless transmitter are based on the setting content of the user. 72 and the
like to operate them in one of two channel mode, wireless headphone mode, and surround mode.
[0070]
Each of the surround LCH speaker 63 and the surround RCH speaker 64 includes a housing 76, a
receiver 77, and a speaker 78. When an optical signal is transmitted from the wireless
transmitter 72, this light is transmitted. A signal is received, and when a surround pilot signal is
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obtained by this reception operation, the light signal is demodulated to reproduce a surround
LCH audio signal or a surround RCH audio signal, and this is output from the speaker 78 as
audio.
[0071]
The housing 76 is constituted by a rectangular box disposed behind the viewer, and the receiver
77 is disposed therein, and the speaker 78 is fitted in an opening formed in the front.
[0072]
In this case, the receiver 77 includes a receiving circuit for receiving an optical signal, and a band
pass filter circuit for extracting a preset frequency component (surround pilot signal component)
from an RF signal obtained by the receiving operation of the receiving circuit. When a surround
pilot signal is included in the signal extracted by the band pass filter circuit, a pilot signal
detection circuit that detects this and generates a surround on signal, and a surround on signal
from the pilot signal detection circuit An audio signal demodulation circuit that demodulates an
RF signal obtained by the reception operation of the reception circuit when being output, and a
surround LCH audio signal or a surround RCH audio signal obtained by the demodulation
operation of the audio signal demodulation circuit And an audio amplifier circuit for amplifying
When an optical signal is transmitted from the less transmitter 72, this optical signal is received,
and when a surround pilot signal is obtained by this reception operation, the optical signal is
demodulated to convert the surround LCH audio signal and the surround RCH audio signal. It
reproduces and supplies these to the speaker 78 to output as sound.
[0073]
In addition, the wireless headphone 62 is fixed to one end of the bridge arm 80 formed of an
elastic member formed in a "U" shape and one end of the bridge arm 80, and an optical signal
transmitted from the wireless transmitter 72 of the VCR device. A receiver 81 for receiving and
demodulating the signal, an LCH speaker 82 fixed to one end of the bridge arm 80, capturing an
LCH audio signal output from the receiver 81 and outputting the signal as voice; the receiver And
an RCH speaker 83 for taking in an RCH voice signal output from the VCR 81 and outputting it
as voice, and receiving and demodulating an optical signal transmitted from the wireless
transmitter 72 of the VCR device 60. The LCH audio signal obtained by the demodulation
operation and the RCH audio signal are transmitted to the LCH speaker 82, the RCH speaker Ca
83 is supplied to the by LCH sound from these LCH speaker 82, RCH speaker 83 to output as the
RCH audio.
[0074]
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In this case, the receiver 81 is a receiving circuit for receiving an optical signal, and a band pass
filter circuit for extracting a frequency component (surround pilot signal component) set in
advance from an RF signal obtained by the receiving operation of the receiving circuit. And a
pilot signal detection circuit that detects an on signal when the signal extracted by the band pass
filter circuit does not include a surround pilot signal and generates an on signal, and the on
signal is output from the pilot signal detection circuit. Audio signal demodulation circuit that
demodulates the RF signal obtained by the reception operation of the reception circuit, LCH
audio signal obtained by the demodulation operation of the audio signal demodulation circuit,
and RCH audio signal And two audio amplifier circuits for amplifying the optical signal from the
wireless transmitter 72. When received, when this optical signal is received and a surround pilot
signal can not be obtained, the optical signal is demodulated to reproduce an LCH audio signal or
an RCH audio signal, which is used as an LCH speaker 82 and an RCH speaker Output from 83 as
voice.
[0075]
As described above, in this embodiment, when the VCR device 60 is operated and the 2-channel
mode is selected, the LCH speaker 67 and the RCH speaker 68 of the audio device 61 connected
to the VCR device 60 by the cord 65 The audio and RCH audio are respectively output, and when
the wireless headphone mode is selected, the VCR device 60 converts the LCH audio signal and
the RCH audio signal into an optical signal and converts it into the wireless headphone 62. When
the surround mode is selected, the VCR device 60 supplies an LCH audio signal and an RCH
audio signal to the LCH speaker 67 and the RCH speaker 68 to reproduce the same and surround
LCH audio. Signal and surround RCH sound Since the signal is converted into an optical signal
and transmitted to the surround LCH speaker 63 and the surround RCH speaker 64 for
reproduction, a long speaker code is used as in the basic embodiment described above. Send LCH
audio signal or RCH audio signal to surround LCH speaker 63 or surround RCH speaker 64 to
reproduce it or send LCH audio signal or RCH audio signal to wireless headphone 62 to
reproduce it be able to.
[0076]
Also, in the above-described embodiments, when surround LCH audio or surround RCH audio is
output from the surround LCH speakers 3, 37, 63 or the surround RCH speakers 4, 38, 64,
transmission from the wireless transmitter 7, 46, 72 The surround pilot signal is put in the
optical signal to operate only the surround LCH speakers 3, 37, 63 and the surround RCH
speakers 4, 38, 64, but as shown in FIG. Optical signal transmitted from the wireless transmitter
by shifting the frequency band 85 of the surround LCH audio signal and the surround RCH audio
signal in the optical signal and the frequency band 86 of the LCH audio signal and the RCH audio
signal as wireless headphones or surround LCH Speaker or surround CH may be caused to play
in one of the speaker.
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[0077]
In this case, as a receiver provided for the surround LCH speaker or the surround RCH speaker,
for example, as shown in FIG. 8, a receiver circuit 87 for receiving an optical signal and an RF
signal obtained by the reception operation of the receiver circuit 87 are preset. And the band
pass filter circuit 88 for extracting the frequency component (surround sound signal component)
being detected, and the signal extracted by the band pass filter circuit 88 is detected when it
includes a carrier signal of the surround sound signal band. A carrier detection circuit 89 for
generating a surround on signal, and an audio signal demodulation circuit 90 for demodulating
the signal output from the band pass filter circuit 88 when the surround on signal is output from
the carrier detection circuit 89; The noise obtained by the demodulation operation of this audio
signal demodulation circuit 90 A command LCH audio signal, the receiver 84 having the audio
amplifier circuit 91 for amplifying captures and surround RCH audio signal is used.
[0078]
Then, when an optical signal is transmitted from the wireless transmitter, the optical signal is
received and demodulated, and when the carrier signal of the surround sound signal band set in
advance is obtained by the demodulation operation, the demodulation is performed. The
surround LCH audio signal and the surround RCH audio signal obtained by the operation are
supplied to the speaker 92 to output audio.
[0079]
Further, as a receiver provided in the wireless headphone, for example, as shown in FIG. 9, a
receiver circuit 93 for receiving an optical signal as shown in FIG. 9 and a frequency component
preset from an RF signal obtained by the reception operation of this receiver circuit 93 A band
pass filter circuit (BPF) 94 for extracting a headphone audio signal component, and a signal
extracted by the band pass filter circuit 94 when it includes a carrier signal of a headphone audio
signal band, is detected and turned on And an audio signal demodulation circuit 96 for
demodulating the signal output from the band pass filter circuit 94 when the on signal is output
from the carrier detection circuit 95; and the audio signal demodulation circuit Capture the LCH
voice signal obtained by the demodulation operation of 97 and the RCH voice signal In receiver
79 and a sound amplifier circuit 97 and 98 for amplification is used.
[0080]
Then, when an optical signal is transmitted from the wireless transmitter, the optical signal is
received and demodulated, and when a carrier signal of a headphone signal is obtained by this
demodulation operation, an LCH audio signal obtained by this demodulation operation And RCH
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audio signals are supplied to the speakers 99 and 100 and output as audio.
[0081]
Even in this case, the surround LCH audio signal and the surround RCH audio signal are sent to
the surround LCH speaker and the surround RCH speaker without using a speaker code as in
each of the above-described embodiments, and this is reproduced or LCH Audio signals and RCH
audio signals can be sent to the wireless headphones for playback.
[0082]
In the embodiment described above, the wireless transmitter 7, 46, 72 generates an optical
signal and transmits it, but the wireless transmitter 7, 46, 72 generates a radio wave signal of the
FM system or the like by the wireless transmitter 7, 46, 72. It may be generated and sent.
[0083]
Further, in the above-described embodiment, the wireless headphone / surround system
according to the present invention is applied to a television apparatus or a VCR apparatus, but
may be applied to a video disc player or an AV center.
[0084]
As described above, according to the present invention, the surround LCH audio signal and the
surround RCH audio signal are sent to the surround LCH speaker and the surround RCH speaker
without using a long speaker code, and surround LCH audio, Surround RCH audio can be output,
and LCH audio signals and RCH audio signals can be sent to wireless headphones to output LCH
audio and RCH audio.
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