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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an example of an FM 4
channel transmission system, FIG. 2 is a block diagram of an example of an FM 4 channel
reception system, and FIG. FIG. 7 is a block diagram of one implementation fl'l of the -4 channel
identification and display circuit. 10 иии 19KHz filter circuit, 11 и и и и и и и и и и и и и и и и и и и и и и и 76 и KHz
switching circuit, 14 и и и и и и и и и и и и и и и иии Amplifier, 17 ииииииии Comparison circuit, 18S channel
display circuit, 21 иии 2 channel display circuit. 13-real opening 48-52407 (2) ??
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a one-channel to
one-channel weave display circuit in an IM reference channel receiver, and the difference
between the output of the front and rear channels in the reference channel signal is in the front
and rear in the p1 co-channel signal. The identification display circuit is configured to reliably
display one channel and the da channel corresponding to the aspect of the received signal by
utilizing the fact that there is no difference in the outputs of the channels (1) -'- '17-dan. Intended
to be provided. The following description will be made with reference to the drawings. Figure 7
/? The block systematic diagram of an example of the transmission system which transmits a
signal by making-as a pilot signal and using 76KHl as a switching signal for reference channels is
shown. After switching each channel signal IIa, LR and ~, RR supplied to the switching circuit /
and the switching circuit by the switching signal from the 76 ? 2 oscillator 3, the signals (L +
LII) and (R, 10 RB) Through the srin 2 switching circuit, and switched by the signal of JtKH2
from the divider S. ????? The output of the second switching circuit is superimposed on the
pilot signal of / 9 KH2 from the frequency divider 4 and guided to the transmitter 7 for
transmission. The signal transmitted from the transmission system is received by the reception
system as shown in FIG. The composite wave signal from the receiver l is input to the switching
circuit. j :: go ==; 2: -k ?If: ? ? ? ? KMz taken out at the output of the second KMz filter
circuit IO / De KM2 is led to the multiplier // The combined wave signal input to the switching
circuit is switched by a signal of 31 KH2 from this and (L?LR + и (1?1). 7) to separate. Signals
(L, + LR), (R-a ? l,) Fi 74KM, switching circuit lco, led to 13 and JJ X Hz multiplied and C174km
from 1x speed multiplier l #. The signals Ly, LR and Pl, RR are taken out at the outputs of the
switching circuits l, 13, respectively. FIG. 3 shows a block diagram of an embodiment of the
circuit according to the invention for the co-channel-to-channel identification of the signals
transmitted and received as described above. As described above, the channel signals LA, LRS'RA,
and RA of the skin are taken out from the 741 CH2 switching circuit / J, / J of the receiving
system. Here, it is sent from the sending system. When the signal is a reference channel signal,
the signal appearing at the outputs of switching circuits lco and 13 is a low ?WLp?.
????????? Also, when the signal from the transmission system is a one-channel signal,
the signal appearing at the output of the switching circuit / co and the output of "48-52407-04211 1 stomach" 130 is "L-ar" LR1R-ar. ?????????? Each output of switching circuit lco
(also Fi / J) L a and I + R is an amplifier /! , It weekly boosts and supplies north wall circuit 17.
The comparison circuit I8 / 7 consists of a visible resistor, and the position of the slider is
amplifier /! The input to the amplifier / I is set to be at zero level when the signal from / 1 is at
the same level. Here, when the signals Il, LR appear at the respective outputs of the switching
circuit l-, and when it is six Ls (i.e., when the receiving system receives the reference channel
signal), the signal L-a of the relatives, -1 Is amplified further by the amplifier 15.16 to generate a
potential difference at the output of the comparator 17. This potential difference is amplified by
the amplifier it and then rectified by the rectifier circuit l. This DC voltage is supplied to the
reference channel display circuit O to turn on the reference channel display lamp and indicate
that the receiver is receiving data. Do. Part of the DC voltage supplied to the reference channel
display circuit O is led to a channel display circuit 1 as a muting voltage. 48-52407-Q5 (God)
Pretending-Stop-,--Channel display circuit group / i! The signal 19y of the / 9 KHz filter circuit
10 is operated by a signal of a multiplier // JI1 M which doubles the output of the / 9 KHz filter
circuit 10 to turn on a co-channel indicator lamp. Here, when the signal voltage from the
reference channel display circuit OO is led to the cochannel display circuit / as a control voltage,
the cochannel display circuit l1 is not operated and the 1 channel display lamp of the 1 display
cycle S S1 is A signal L-a appearing at the output of the 0 area 1 switching circuit / a husband of
the star extinguishing ?, if LR is -1-'LR (i.e., 11 if the receiving system receives one channel
signal), a comparison circuit No potential is generated at the 17 outputs, and no signal is
transmitted to the amplifier / l circuit. Therefore, the warning circuit circuit O is not in operation,
the date indicator lamp is turned off, and at the same time, there is no voltage to be applied to
the display circuit. Therefore, the co-channel display circuit // is operated by the signal voltage
from the multiplier / l to light up the co-channel display lamp to indicate that one-channel signal
is being received. As described above, according to the one channel radar channel identification
display circuit in the IM reference channel receiver, since the duchannel display is performed by
the difference between the front and rear channel output components of the left or right channel,
the reception system The reference channel display is performed only when the D channel signal
is received, and the one channel display is set to be neat, and only the ? channel display is
performed when the receiving system receives the one channel signal. It has features such as
identification display can be performed reliably corresponding to the aspect of the received
signal, and the circuit configuration is simplified. That.
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