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JPS54117602

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DESCRIPTION JPS54117602
Fl specification · 1, name of the invention
Voice signal transmitter
3. Detailed Description of the Invention The present invention relates to an audio signal
transmitting apparatus for converting a monaural audio signal into an audio signal in which a
sound image is pseudo-expanded, and an object thereof is to provide an apparatus for obtaining a
pseudo-magnified audio image inexpensively and easily. . Conventionally, FM radio broadcasting
performs stereo radio broadcasting using the main channel and the subchannel, but in the
present invention, using this principle, FM images are used to obtain sound images that are
enlarged in a pseudo manner. For example, a monaural audio signal of television broadcasting
can be obtained from the earphone terminal of a television receiver, converted into a signal of
pseudo magnified sound image and transmitted by radio wave, and this signal is received by the
stereo receiving apparatus One. The sound image EndPage: 1 / -1 magnified from the speaker
(headphone) of Hereinafter, the transmitting side is shown in FIG. 1 for explaining one
embodiment of the present invention with reference to the drawings. 1 is an audio signal
processing circuit for obtaining two series of audio signals from monaural audio signal 5 · · 2 is
an FM wave transmitter used in a pilot tone system · 3 is an FM modulator and 4 is a
transmitting antenna . The monaural audio signal generated from the monaural audio signal
source 5 of the audio signal processing circuit 1 is applied to the mixer 10 and also applied to
the delay element 6 formed of BBD or COD. The delay element 6 is for transferring a signal by
the clock pulse from the clock pulse generator 7 and, for example, delays about 4 msec. The
main audio signal M applied to the mixer 8 corresponds to the L + R signal of the FM stereo
broadcast, and the sub audio signal S applied to the counter modulator 9 corresponds to the L-R
signal of the FM stereo broadcast. It is a thing. The sub-audio signal old counter-modulates the
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subcarrier (38 KHz) from the subcarrier signal generator 1 o having the crystal 11 as an
oscillation source. The output of the subcarrier signal generator 10 is converted to a pilot signal
(19 KHz) whose frequency is halved by a 1/2 frequency divider 12 and is applied to the mixer 8.
These three signals are FM-modulated by the FM modulator 3 and emitted from the transmitting
antenna 4 so that the pilot signal is used to demodulate the subcarrier. FIG. 2 shows the
frequency spectrum of this transmission signal. FIG. 3 shows a specific circuit diagram of the
above-mentioned counter modulation modulator 9. As shown in FIG. When the auxiliary audio
signal S is applied from the delay element 6 to the terminal 13 and the subcarrier signal C is
applied from the subcarrier signal generator 10 to the terminal 14, the four diodes 16.17.18.19
become the subcarrier. The signal is opened and closed, and an amplitude modulated waveform
is obtained at the terminal 15.
This corrugation is applied to the mixer 6. The principles of the present invention will be
described by means of equations. In the FM stereo broadcast by the conventional pilot tone
scheme, the modulation signal A for modulating the main carrier is expressed by the following
equation. A = (L + R) + (L−R) sin ωst + Psxn−t where L is the left signal of stereo broadcasting,
R is the right signal of stereo broadcasting, ωS is the frequency of the subcarrier for stereo
broadcasting (> π · 38 KHz), P [ Since the main audio signal M and the auxiliary audio signal S
shown in FIG. 1 which are the amplitude of the pilot signal are L 丑 M-1-3, R2M-8, the
modulation signal A is expressed by the following equation. A = 2 M-1-2 SS in ω 5 t-4-P sin-t
Therefore, the main voice signal, the subcarrier signal in which the subcarrier signal is
amplitude-modulated with the sub voice signal, and the pilot signal Know what to do. The
receiving side is shown in FIG. This is a conventional FM radio receiving side, and the composite
antenna transmitted from the transmitting antenna 4 is received by the receiving antenna 2o,
and the low pass filter (LPF) 2220 is discriminated by the discriminator 21 and the band pass.
The filter (BPF) 23 is applied. The low-pass filter 22 extracts the main audio signal M, and the
band-pass filter 23 extracts the sub-audio signal S, which is then detected by the detection circuit
24 and demodulated by the IJ circuit 25 respectively. There are those which obtain the signals M
+ S and M-8. FIG. 6 shows a circuit diagram of the receiving side of FIG. When the detection
output signal from the discriminator 21 of the terminal 28 is applied, the main audio signal M is
obtained as the output of the low pass E wave device 22 and the sub audio signal S is obtained as
the output of the 38 kHz band pass p wave device 23 Be The auxiliary audio signal S is detected
by a pair of diodes 29.30 reversely connected to each other, and an auxiliary audio signal S and
an auxiliary audio signal -8 are obtained at each end of the resistor 31.32. Since the main audio
signal M is applied to the intersection of the resistors 31 and 32, both M + S and M-8 appear at
the output terminal 26.27. When these signals M-1-3 and M-8 are listened to by the stereo
receiver with a pair of speakers or headphones, a pseudo three-dimensional acoustic window can
be obtained by the human binaural effect. EndPage: 2 "To give an example of -1 use, a jack is
inserted into an earphone terminal of a television receiver to apply a television broadcast audio
signal to a monaural audio signal source and the like. If the radio wave emitted from the
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transmitting antenna 4 is received by the FM tuner of the stereo receiver installed at a position
slightly apart and reproduced, the monaural audio signal of the television broadcast is heard as a
pseudo three-dimensional sound by the stereo receiver It's wireless and it's wireless, so it won't
be disturbed by the code.
Although the clock pulse generator 7 is separately provided as the clock signal of the delay
element 6 in the above embodiment, it is also possible to use the output of the 1/2 divider 12
instead of the generator 7. For example, assuming that the number of stages of the delay element
1'56 is H, since the frequency of the bit by bit signal is 19 KHz, the delay time is N / 2 × 19 ×
10 (sea). Also, the frequency of the clock signal of the delay element 6 is 20% synchronized with
the horizontal synchronization signal X-wave number of the television receiver, and it avoids the
beat sound of the clock signal and the input signal. Of course, it can also be used as a
transmission means. As described above, according to the present invention, it is possible to
convert a monaural sound signal into a pseudo-enlarged sound image signal and transmit and
receive it to enjoy a sound with a three-dimensional effect. Moreover, since the auxiliary audio
signal is independently made the amplitude modulation wave of the subcarrier, the phase
inversion circuit of the auxiliary audio signal is unnecessary, and the mixing circuit of the main
audio signal and the auxiliary audio signal is also unnecessary, and the circuit configuration can
be simplified. . Further, since the main audio signal and the sub audio signal are transmitted
independently, the balance circuit is not necessary.
4. Brief description of the drawings FIG. 1 is a block diagram of a transmitter of an audio signal
transmitting apparatus according to an embodiment of the present invention, FIG. 2 is a
frequency spectrum of a composite signal of the apparatus, and FIG. FIG. 4 is a block diagram of
the receiver, and FIG. 5 is a circuit diagram of the receiver. 1 ········· Audio signal processing circuit,
2 ········ FM wave transmitter, ¥ 3 °° -FM modulator 4 °°°°°° Transmission 7 antenna •
5 ° ° ° ° °. EndPage: 3 FIG. 2 FIG. 4 FIG. 5 End Page: 4
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