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JPH04296197

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH04296197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wireless transmitting and receiving apparatus, and more particularly to a transmitting and
receiving apparatus for digital type wireless headphones.
[0002]
2. Description of the Related Art FIG. 1 is a block diagram of a conventional transmitter for an
analog wireless headphone, which comprises amplifiers 31 and 32 and is applied to the
headphone output end of a television receiver or an audio set. The first amplification unit 33 for
amplifying and outputting the left and right stereo audio signals with a predetermined
amplification degree, and the frequency modulation unit 35 for frequency-modulating and
outputting the input output signal of the first amplification unit 33 And a first band pass filter
unit 36 for detecting only the frequency signal in the middle setting band of the output signal of
the frequency modulation unit 35 to be input, a transistor Q4 and a light emitting diode D5 for
radio transmission, and the first band to be input And a wireless transmission unit 37 for
transmitting the output signal of the pass filter unit 36 in infrared light.
[0003]
FIG. 2 is a block diagram showing the construction of a conventional receiver for radio
headphones for analog system, which comprises a light receiving diode D8 for radio reception
and a transistor Q5, and amplifies a transmission signal of the radio transmission unit 37
inputted. And a second band-pass filter unit 41 for detecting and outputting only the frequency
signal in the setting band in the output signal of the input radio receiving unit 38, and The
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demodulator 44 for demodulating and outputting the frequency signal of the second band pass
filter unit 41, the resistors R1 and R2, the capacitors C1 and C2, and the amplifiers 45 and 46
are provided, and the output signal of the demodulator 44 to be input is predetermined A second
amplification unit 47 for amplifying and outputting at an amplification degree of: a switch SW 1,
resistors R 3 and R 4, power amplifiers 48 and 49, and a head amplifier An output unit 52 for
outputting the analog audio signal by audio signal of the second amplifier 47 to be input with the
over emissions speaker 50 and 51 are those composed of.
[0004]
The operation according to the above configuration will be described below with reference to
FIGS. 1 and 2.
[0005]
The left and right stereo audio signals input through the headphone output end in a general
television receiver or audio set are weak through the amplifiers 31, 32 and amplified to a
predetermined amplification degree through the frequency modulation unit 35 because the
signals are weak. It is output after being frequency modulated.
[0006]
The band pass filters 36a and 36b of the first band pass filter section 36 pass only frequency
signals of the set band, and then the frequency modulated voice signal is provided in the wireless
headphone via the wireless transmission light emitting diode D5. It is transmitted to the light
receiving diode D8 for wireless reception.
[0007]
At this time, the diode D7 emits an optical signal that indicates the transmission state of the
signal.
The LED driver 34 is for driving the diode D7.
[0008]
An audio signal inputted through the wireless reception light receiving diode D8 is amplified to a
predetermined amplification degree through the transistor Q5.
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[0009]
The band pass filters 39 and 40 of the second band pass filter section 41 detect and output only
the frequency signal in the middle setting band of the audio signal amplified through the
transistor Q5, and the demodulators 42 and 43 output the same as the original audio signal.
Demodulate.
The demodulated voice signal is then filtered through low pass filters, resistors R1 and R2 and
capacitors C1 and C2, and amplified through amplifiers 45 and 46.
[0010]
After the left and right stereo audio signals amplified through the amplifiers 45 and 46 are
determined by the switch SW1 to be output in mono or in stereo, audio signals can be output
through the power amplifiers 48 and 49. And amplified through the wireless headphone
speakers 50 and 51.
[0011]
SUMMARY OF THE INVENTION However, the transmitter / receiver for radio headphones of the
analog type as described above is very weak against noise.
Therefore, when an audio signal is transmitted using infrared light, a malfunction may occur
depending on the direction of the television or audio set, and there is a concern that interference
noise may be generated by an infrared light signal generated by another system. .
Therefore, the present invention has been made in view of the above-mentioned conventional
problems, and after processing an audio signal received by a television receiver or an audio set
by a frequency modulation method, it wirelessly transmits the signal by a digital transmission
method. It is an object of the present invention to provide a transceiver for a wireless headphone
which again processes the digital signal in the digital reception system.
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[0012]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
frequency-modulates an input broadcast audio signal, transmits it on infrared light and transmits
it, and after it frequency modulates it with an audible sound Make it output.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the
present invention thus constructed will be described in detail with reference to the attached
drawings.
[0014]
FIG. 3 is a block diagram of a digital radio transmission apparatus according to an embodiment
of the present invention, which comprises a QPSK (Quadrature Phase Shift Key) demodulator 1
and an audio demodulator 2 and is used to transmit a broadcast audio signal of QPSK
transmission system. A demodulator 21 for inputting and demodulating into a digital signal and
separating and outputting it into three channel data, a D / A converter 3, a first amplifier 4 and a
speaker 5 A voice signal is converted into an analog signal, which is then amplified to a
predetermined level and output at a first output unit 22. Carrier frequency modulators 6a, 6b
and 6c and frequency oscillators F1, F2 and F3 are provided. Frequency modulation unit 23 for
frequency-modulating and outputting the three channel data to be output, and amplification 7a,
7b, 7c, an amplifying unit 24 for amplifying and outputting an output signal of the frequency
modulation unit 23 inputted and having a transmittable predetermined amplification degree,
transistors Q1 to Q3 and radio transmission diodes D1 to D3 A wireless transmission unit 25
configured to wirelessly transmit the output signal of the amplification unit 24 which is provided
and placed on an infrared ray.
[0015]
FIG. 4 is a block diagram showing the construction of a wireless receiver for a digital wireless
phone according to the present invention, which comprises an infrared receiving diode D4 and a
preamplifier 9 to receive the transmission signal of the input wireless transmitter 25. After that,
it has a radio reception unit 26 for amplifying and outputting it at a predetermined amplification
degree, and band pass filters 10a, 10b and 10c, and detects and passes frequency signals
corresponding to each channel from the output signal of the radio reception unit 26 inputted. A
band pass filter unit 27 for detecting the frequency band, a detection unit 28 having detectors
11a, 11b and 11c for detecting and outputting an envelope value of each channel data from each
output signal of the band pass filter unit 27; The D / A converter unit 12 for converting and
outputting the 28 output signals in analog form, the power amplifiers 13a and 13b, and the
speaker 14a A second output portion 29 for an audio signal is amplified to a predetermined
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amplification degree an output of the D / A converter 12 to be input with a 14b, composed.
[0016]
The operation of the invention according to the above construction will now be described with
reference to FIGS. 3 to 6 of the attached drawings.
[0017]
First, as shown in FIG. 3, when a digital audio signal So transmitted by the QPSK system, which is
a digital transmission system, is received by the television receiver, this signal is demodulated
into a digital signal through the QPSK demodulator 1. Be done.
Then, the digital signal is demodulated into a digital voice signal through the voice demodulator
2 and then separated and output as digital voice data S1, timing data S2 and digital channel
information data S3.
[0018]
The D / A converter 3 converts the digital audio data S1, the timing data S2 and the digital
channel information data S3 into an analog signal, and this analog signal is amplified to an audio
amplification degree through the first amplifier 4 and then the television It is output as an
audible voice signal through the speaker 5 provided in the John.
[0019]
Now, as shown in FIGS. 6a to 6c, the digital voice data S1 indicates the transmitted voice data
value, and the timing data S2 indicates the presence or absence of the data after the transmitted
digital voice data S1 is synchronized. The digital channel information data S3 is a clock signal to
be provided for recognition, and includes information indicating whether the digital audio data
S1 is a mono or stereo signal.
[0020]
Also, the digital voice data S1, the timing data S2 and the digital channel information data S3
output through the voice demodulator 2 are simultaneously input to the carrier frequency
modulators 6a, 6b and 6c, respectively, according to the frequency oscillators F1, F2 and F3. As
shown in FIG. 6d, the carrier wave is modulated to a predetermined frequency and output.
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[0021]
In general, carrier modulation allows the user to change the modulation frequency directly by
adjusting the frequency oscillators F1, F2, F3.
[0022]
Thus, interference can be prevented from being generated by infrared radiation generated from
any system used at the same place.
[0023]
Next, the voice data S1, timing data S2 and digital channel information data S3 are amplified to a
predetermined amplification degree so as to be suitable for transmission by the second, third and
fourth amplifiers 7a, 7b and 7c, and then the infrared transmitter 8a. , 8b and 8c and transmitted
to a wireless headphone equipped with the wireless receiver 26 and carried in the infrared.
[0024]
The wireless receiver 26 incorporated in the wireless headphone receives all of the digital voice
data S1, timing data S2 and digital channel information data S3 through the infrared receiving
diode D4, and amplifies it to a predetermined amplification degree through the preamplifier 9.
The signal is simultaneously transmitted to the corresponding band pass filters 10a, 10b and
10c.
[0025]
Each band pass filter 10a, 10b, 10c detects only the frequency signal of the band corresponding
to the digital voice data S1, the timing data S2 and the digital channel information data in the
input signal, and detects the envelope detectors 11a, 11b, Output to 11c.
The envelope detectors 11a, 11b and 11c detect envelope values of the voice data S1, timing
data S2 and digital channel information data S3 and send them to the D / A converter 12.
[0026]
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The D / A converter 12 analog-converts the envelope values of the input digital audio data S1,
timing data S2 and digital channel information data S3 and outputs the result to the second
output section 29 in the wireless headphone.
The analog signal input to the second output unit 29 is amplified to an audible amplification
degree through the power amplifiers 13a and 13b, and then output through the speakers 14a
and 14b.
[0027]
Here, the internal operation of the D / A converter 12 will be described in detail with reference to
FIG.
[0028]
When the digital audio data S1 and the timing data S2 are input to the timing controller 15 of the
D / A converter 12, the digital audio data S1 is synchronized with the timing data S2 and then
temporarily stored in the digital latch unit 16, The digital audio signal is temporarily stored in
both the right channel data latch unit 17 or the left channel latch unit 18 or the left and right
channel data latch units 18 and 17 according to the information content of the digital channel
information data S3. It is input to the 2D / A converters 12a and 12b.
[0029]
The first and second D / A converters 12a and 12b convert the input digital audio signals into
analog signals, and send analog signals S4 and S5 to the second output section 29.
[0030]
As described above, according to the present invention, since the demodulated digital voice data
is carrier-modulated and then wirelessly transmitted, the user can hear clean voice without noise
with a wireless headphone. Since the user can listen to the signal and the user can change the
modulation frequency, it is possible to prevent infrared ray mixture with other systems using
infrared signals.
[0031]
Brief description of the drawings
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[0032]
1 is a block diagram of a conventional analog radio transmitter for wireless headphones.
[0033]
2 is a block diagram of a conventional analog wireless receiver for wireless headphones.
[0034]
3 is a block diagram of the configuration of a digital radio transmitter for wireless headphones
according to an embodiment of the present invention.
[0035]
4 is a block diagram of the configuration of a receiver for a digital wireless phone according to
an embodiment of the present invention.
[0036]
5 is a detailed block diagram of the D / A converter unit of FIG.
[0037]
66a to 6d are waveform diagrams of digital signals according to an embodiment of the present
invention.
[0038]
Explanation of sign
[0039]
REFERENCE SIGNS LIST 1 QPSK demodulator 2 voice demodulator 3 D / A converter 4 amplifier
5 speaker 6 a, 6 b, 6 c carrier frequency modulator 7 a, 7 b, 7 c amplifier 8 a, 8 b, 8 c infrared
transmitter 9 amplifier 10 a, 10 b, 10 c band pass filter 11a, 11b, 11c Envelope detector 12 D /
A converter 13a, 13b Power amplifier 14a, 14b Speaker 15 timing controller 16 digital data
latch section 17 right channel data latch section 18 left channel data latch unit
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