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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of
the present invention. 1
·········· 4 ··· Electronic switches; lamp, 6 ...... third sub channel detection circuit, T ...... electronic
switch, 8 ...... lamp.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four channel
receiver equipped with a four channel receiver, a V channel four channel stereo indicator and a
two channel stereo indicator. In recent years, interest in the Fivi 4-channel stereo broadcast has
been increasing, and it is possible to capture the 4-channel stereo broadcast visually by providing
an indicator indicating that it is receiving i-channel stereo broadcast. It is useful to be clear. In
general, in order to clearly express 4-channel stereo broadcast, the circuit configuration of the 1minute circuit is described. It is conceivable to connect a lamp as an inverter to each emitter of
the second transistor and to mark a switching signal at the base of the first transistor. However,
if the first pilot signal in a two-channel stereo signal) is used as a switching signal), the lamp
connected to the first transistor at the time of reception of a two-channel stereo signal is @ 1
turned as a two-channel stereo indicator when receiving three channels. The lamp connected to
the second transistor at the time of reception operates as a monaural indicator, and the lamp
connected to the first transistor at the time of reception of a four-channel stereo language
operates as a four-channel stereo indicator / charger. Even when the two-channel stereo signal
reception and the monaural signal reception can be distinguished visually, the four-channel
stereo signal reception and the two-channel stereo signal reception can not be distinguished
visually. On the other hand, if it is not included in the two-channel stereo signal as a switching
signal, but is heavy in the four-channel one-re-stereo signal. When 4 channels of signal only for +
itl channel are used, the lamp closely connected to the 1st train / sta operates as 4 channels
stereo ino / cat when receiving 4 channels stereo signal, 2 channel stereo color code reception]
侍(· A lamp connected to c $ 2 train / sta operates as a 2 channel ン channel stereo in) The gater
operates as a monaural indicator when the mono 4-sil signal is received. Even if it is possible to
visually distinguish between two-channel stereo signal reception and four-channel stereo signal
reception, it is not possible to distinguish visually between monaural signal snowfall and twochannel stereo signal reception temple-C It was hot. The present invention solves the drawbacks
of the prior art apparatus as described above, and receives a two-channel stereo indicator, which
is operated by the control part of pylon +4 contained in a two-channel stereo signal, as a fourchannel stereo signal receiver1. At the same time, be sure to use VCC control so that it will be in
the non-operating state ˜ L. (From the above, 21 indicators will be used for one, 2 channels, 4
channels,% J & in inner speech 4v visually) It provides a 4-channel receiver configured to
Hereinafter, one channel example of the 4-channel receiver according to the present invention
will be described for the 4-channel receiver of the present invention and 8 units, which will be
described with the drawing of the embodiment together with the example 5. For example,
consider a signal represented by a fifth order equation. M (t) T ((LF + LR) + (RF + RR)) + ((LF +
LR)-(Ry-1-Rn)) sin ωt + ((LFLR)-(RF-Ru)) cos ωt + ((Ly-LR) + (RF) −RR)) sin 2ω is given by
KS1n−ωt ··· (1) where K, fixed pattern, Iπ-38 is derived, LF, left MfI signal, LR9 left rear signal
RF, right front signal, RR, right rear signal (a) Is the input forceps, and the above, the occlusion i:
bow '(t) is input. The composite code M (t) is a combination of the demodulation circuit 1 and the
detection circuit 2 of the 19 KHz pilot signal (fifth term of the equation (1)) and the third
auxiliary channel (fifth term of the equation (1)). The voltage is applied to each of the third
subchannel detection circuits 6 that detect the presence or absence of energy. The detection
circuit 2 detects and amplifies only the 19 KHz pilot signal and outputs a DC signal. The
detection circuit 6 detects and amplifies the energy of the third subchannel band (7e KHz 壺 1s
KHz), and outputs a 6 DC signal only when the 4 channel non-matching signal M (t) is input to
one child (,) . From と T, from the mouth circuit 6, one signal: 佳 demodulation Ll] 41 and the
gate circuit 3 are applied. In the demodulation circuit 1, 2-channel 4-channel automatic switching
is performed by the signal from the 1-knowledge circuit 6, and the @ number input to the end rta
is 4-channel combination [M8), lift / lift 1 summer A circuit 1. Automatic operation (about 4
channel 1 summer adjustment L) road, it is 4 channel non 1 1 summer combined activity M (t),
t1 self time, when market condition output mainly from inspection m 1 circuit 6 , Emotion No. 1:
2 channel of revenge east 2 revenge 1j] is supposed to move as a road. The gate circuit 3 opens
and closes the gate by the direct output from the detection circuit 6, and when the direct current
output is detected from the detection circuit 6, the circuit 2) to 2) 7) DC occupation gate gate
circuit 3 Blocked, the electronic switch 4 remains off. When there is no DC output from the fence
[6], the D detection signal from the specification detection circuit 2 passes through the gate
circuit 3 and is processed by the electronic switch 4 so that the electronic switch 4 or 1 is turned
on. One end of the electronic switch 4 is grounded via the it + B direct source via the pond-1
lamp 5, and when there is a DC output from the gate circuit 3, the lamp 6 is lit.
On the other hand, the DC output of the feed circuit 6 / ll, etc. is also added to the electronic
switch 7), and when there is a DC output from the detection circuit 6, this, L, and D are in the ON
state. One end of the electronic switch 7 is supplied with + B- source, 11! The two ends are
grounded via the i lamp 8 and when there is a DC output from the detection circuit 6, the V lamp
8 is turned on. Therefore, only when the end f-+ a) i 4 channel composite activity M (t) is
inputted, the 5-child switch 7 is turned on and the lamp 8 lights up, while the direct current
generated by 7 V of the 19 KHz pilot signal The output is switched by the cate circuit 3-the child
switch 4 is off and the lamp 5 does not light. When the 2-channel combined signal is human
powered, no DC output is generated in the detection circuit 6, so the switch 7 is off and the lamp
8 is turned on and off 1, ..., next m1 circuit 2b, etc. The direct current output passes through the
gate circuit 3 to turn on the single child switch 4 and the lamp 5 lights up. That is, lap 5 is a 2
channel indicator, lamp 8 is a 4 channel non-in V in 7)), 4 channel reception and 8 o'clock, 2
channel indicator is off. In addition, a detection circuit is used in the first pilot 1 occupation code
and the third sub-channel 1 term 1 easy association (that is, at the time of monaural signal
reception). fll, 1 ('6 The output appears on the' 6, the lamps 6 and 8 yes / f are off too. Here,
although the detection circuit 6 is configured to detect the energy of the J3 + ml channel, it may
be configured as a circuit that inputs the energy of the second subchannel (the third term of the
formula (1)). Although the equation (1) is used as the four-channel composite signal in this
embodiment, the third sub-channel may be the SSB, and ((Ly−LR) = 3 in the third term of the
equation (1). (Ry-RR) and (LF-LR) + (RF-RR)) in the fourth term may be interchanged.
Furthermore, the second one. The third secondary channel may be a 7 ex Hz orthogonal DSB, and
the composite signal M (t) + M (t) = ((LF + LR) + (RF + RR)) + ((LP + LR) (Ry + Ru) ) Sma + t +% 1,
(LF−I 4) sin 2 ωt + (Ry−RR) fish 2 ωt (2). Also, it may be a single-word formulation containing
the second pilot signal of the four-channel display field, or, for example, a hand-held formula (1)
(and a second pilot signal added to the formula is M (t) = ((LF + LR)). ) + (RF + RR)) + ((LF + LR)
(RF 十 fLR)) sin ωt + ((Ly−LR) + (RF−RR)) portion ωt + ((LF−LR) + (RF−RR)) sil + 2ωt + K15 in
−, − ωt + K2s ′ ′-yωt− (3) where + and K2 are constants.
In the equation (3), 5 in Fωt is the second pilot signal. In the above equation, the reason is -ωt =
67, but it may be 9 at other frequencies. Also, a lamp may be used as an indicator, or another
indicator may be used. As described above, according to the present invention, the 4-channel
indicator is operated by detecting signal energy other than the frequency component of the 2channel composite signal which is self-weighted in the 4-channel composite signal) and the 2channel indicator is not activated. Since it is a work, it is possible to visually and visually impress
the difference in the broadcast as well as easily and surely distinguish between 2 channel nonbroadcast and 4 channel broadcast. In addition, the first detection circuit detects a pilot signal
included in the four-channel stereo signal and the two-channel signal and operates the twochannel indicator by the pilot signal, and the second detection circuit detects the four-channel
stereo signal. The 4-channel signal is detected and the 4-channel signal is used to operate the 4channel indicator and the pilot transmits the signal to the 2-channel indicator. Since the control
circuit of the head is controlled, in addition to visually impressing the difference between 2channel and 4-channel broadcasting, the monaural signal reception can clearly distinguish from
time, and so on. Is