SU574857A1 - Three-band phase communication system - Google Patents

Description

This invention relates to communications and can be used to non-transmit continuous messages.

A three-way phase communication system is known, which contains a message converter on the transmitting side, a generator whose output is connected to one input of a phase modulator, a bandpass amplifier whose output is connected to the communication link, and a low-frequency amplifier on the receiving side, a voice amplifier, output which is connected to the input of the phase detector and the input of the amplitude detector, the output of which through serially connected narrow-band filter and the generator strobe pulses connected to one input of the first gating b lock 1.

However, the known communication system has low noise immunity.

The purpose of the invention is to improve noise immunity.

For this, in a three-way phase communication system, there is 1, on the transmitting side, a message converter, a generator, the output of which is connected to one input of the phase modulator, and a bandpass amplifier, the output of which is connected to the communication line, and on the receiving side - a low frequency amplifier and a bandpass amplifier, the output of which is connected to the input of the phase detector and the input of the amplitude detector, the output of which is connected via serially connected narrowband filter and strobe pulse generator to one input of the first gating its block on the transmission side administered serially connected first adder, a first rectifier and a second adder, the second input of which is introduced through the serially connected first delay element and a first pulse shaper connected

with one output of the message converter, which is connected to one input of the first adder, the other input of which is connected to another output of the message converter, which is connected to the third input of the second

an adder via a second pulse shaper inputted in series and a second delay element, the output of which is connected to another input of a bandwidth amplifier via an inputted second rectifier,

the input of which is connected to the output of the phase modulator, the other input of which is connected to the output of the second cjMMaTopa, and on the receiving side three delay elements, two gating blocks, two controlled inverters, an adder and an amplitude selector, and the output of the phase detector through serially connected first element delays, the first gating unit, the first controlled inverter and the adder are connected

with the input of the low-frequency amplifier, where the output of the phase detector is connected via a second delay element, a second gate unit, a second control unit and a third delay element with another input of the adder, and through a third gate unit with an input of an amplitude selector, whose outputs are connected to another The inputs of the nerve and the second controlled inverters, the irich output of the strobimulse generator is connected to the other inputs of the second and third gating units. FIG. 1 shows a structural electrical circuit for a communications system; in fig. 2 - time diagrams that show her work. The communication system contains, on the transmitting side, the converter 1, collectively, generator 2, the output of which is connected to one input of the phase modulator 3, the band-pass amplifier 4, the output of which is connected to the communication line 5, and subsequently connected to the first adder 6, the first rectifier The driver 7 and the second adder 8. The second input of the adder 8 through sequentially connected the first element 9 delay and the first driver 10 imiulsov connected to one output of the inverter 1 of the common leads connected to one input of the first adder 6. Another input of this ummatora connected to another output of transducer 1 messages, which is connected to the third input of the second adder 8 through the series connected second driver 11 and the second delay element 12. The output of element 12 via the second coupler 13 is also connected to another input of the band amplifier 4, whose input is connected to the output of the phase modulator 3, another input of which is connected to the output of the second adder 8. On the receiving side the communication system contains a low-frequency amplifier (ULF) 14, a nano-amplifier 15, the output of which is connected to the input of the phase detector 16 and the output of the amplitude detector 17. The output of the detector 17 is sequentially connected to the narrowband filter 18 and the strobe pulse generator 19 is connected to one input of the first the strobe unit 20. The output of the phase detector 16 is through a sequence of the first delay element 21, the first pilot unit 20, the first controlled inverter 22 and the adder 23 connected by the ULF input 14. The output of the phase detector 16 is also connected via serially connected second delay element 24, the second the gating unit 25, the second controlled inverter 26 and the third delay element 27 with another input of the adder 23 and the third gate gating unit 28 - with the input of the amplitude selector 29. The outputs of the selector 20 are connected to other inputs the first 22 and second 26 controlled inverters, with the output of the gate generator 19 connected by other inputs of the second 25 and the third 28 gate blocks. The communication system works as follows. The t / Bx message (0 (Fig. 2, a) in the message converter 1 is converted into two pulse oscillations (Fig. 2.6 and c). The amplitudes and field of the last bursts of the last ramps are respectively odd and even sample message values selected with The discretization step 7 is in accordance with the Kotelnikov theorem. In this case, the beginning of each vibration oscillation, shown in Fig. 2, b, is delayed by a time relative to the corresponding selective value, and the beginning of each vibration pulse, shown in Fig. 2, c, coincides with the corresponding choice The duration of these pulses is -J. As a result of summing these impulsive oscillations in adder 6 and straightening in rectifier 7, a oscillation is obtained (Fig. 2, d), which is summed in adder 8 with two other pulsed oscillations. The latter are obtained in both the gain and the limit in the formulators imulis 10 and 11 and the delay in the delay elements 9 and 12 output (nm) oscillations of the converter 1. In this case, the delay time in the perPX of the TEM element is ZT, of the holder 9 is 4, and in the 7th delay element 12 it is 2-, and the amplitude of the output oscillation of the first delay element 9 is twice the amity of the output oscillation of the second delay element 12 and so that the initial phases of the output oscillation of the phase modulator 3 take the value -135 °, -45 °, -f45 °, + 135 ° with an accuracy of constant. As a result of the amplification on the output of the adder 8, the oscillation shown in FIG. 2, and a continuous line. This oscillation consists of rectangular video LINKS with a duration of 2-, directly 3 following one after another. Amplitudes of 1, 4, 7, ..., (1 + 3 / g) th rabbis video packets to modules of odd sample message values, amilitudes 2, 5, 8, ..., (2 + zl) th video packets - module m of the fourth sampled message values, the amplitudes ir of polarity 3, 6, 9, ..., 3 (1 + / g) -th video parcels carry information about the polarities of the two previous sample values of the comp 1, enn: most positive and negative extradelivery correspond to positive and negative odds of odd and even selective message values; If three people have MenijHie and half a floor of video parcel poozhntelia, then the original selective value is positive and even negative value is negative; In the case of a negative color video and a three times smaller amplitude, the odd selective reduction is negative and the even positive. The output oscillation of the adder 8 is produced in phase modulator 3 of the phase modulation of the harmonic oscillation of the generator 2. The output oscillation of the phase modulator 3 is amplified, amplitude-modulated and filtered in the band-pass amplifier 4. The amplitude modulation is produced by the output voltage of the rectifier 13, the input which is associated with the output oscillation of the second delay element 12. This amilitz (shallow) modulation is necessary for synchronizing the operation of the receiving part. The signal obtained in the bandpass amplifier 4 is transmitted via the communication line 5 to the voice amplifier 15 of the receiving part n further to the phase 16 and amplitude 17 detectors. As a result of phase detection, a slightly smoothed (due to transients) modulating oscillation is obtained, as shown in FIG. 2, d dotted line. In order to reproduce the message, the modules of the odd n even sample values of the message, as well as the amities and polarities of 3, 6, 9, ..., 3 (1 + 1) -th video parcels, are restored using the gates 20, 25, and 28 o. For this, the output oscillation of the phase detector 16 is supplied to the gating units: directly to the gating unit 28, and to the gating units 20 and 25 through the delay elements 21 and 24, respectively, in order to combine video sequences 1, 2, 3 into time groups, 4, 5 , 6, etc. This is necessary to restore reference zero values. Straight strobe pulses with duration are produced in the generator of pulses 19 at the ends of 3, 6, 9, ..., 3 (1 + ") video sequences, when transients are almost complete. For this, the strobe pulse generator 19 is synchronized by the oscillation generated by the output oscillator of the amplitude detector 17 for filtering it in a narrow band 18. The pulse amplitudes of the output oscillations of the gating blocks 20 and 25 are not proportional to the moduli of odd even selections; 1X message values, corresponding to. These co-pebbles are shown in FIG. 2, in, and 2, -Fixed by line. To restore the odd and even odd polarities of selectively significant messages, the output of the baths of the strobe blocks 20 and 25 is fed to the controlled inverters 22 and 26, where the input pulses are inverted or not, depending on the presence or absence of the pulse at these points. the amplitude selector 29. From the amplitude selector 20, the pmpels are fed to the controllable inverters 22 and 25 simultaneously with the largest negative pulse at the input of the amplitude selector 29. If If the pulse is three times smaller in amplitude, the pulse is negative, then the pulse for inverting is fed only to the controlled inverter 26. The inverted pulses are shown in Fig. 2, e and 2, and are dotted; the message that displays the output pulse oscillations of the irrhorster 22 is also shown. and 26. These oscillations are summed in the adder 23 and after the pre-delay in the third delay element 27 of the output PULSE oscillation of the controlled inverter 26. The output oscillation of the adder 23 shown in FIG. 2.3 by continuous lithium, and after smoothing it in the low-frequency amplifier 14, is converted into the transmitted f / Rb message, - (0 is conventionally shown by the line in Fig. 2, h.

The proposed three-lane phase communication system requires a transparency band of the telecommunication network Af / ::,

and

2 tp

where; „- / - the duration of the video. AT

ABOUT

J

T

according to the foregoing

where 2 /

fn - upper bound frequency of communication. P Using the last three equalities, we get DD. 3 / v, i.e. the required transparency bandwidth of the communication channel is three times the amount of the message spectrum.

The transfer of modules of sample values of the message leads to a twofold increase in the MODULATION index and a corresponding increase in the generalized power gain of the non-transmitter four times (or 6 dB). The introduction of a discrete discrete channel for non-transmitting selectively significant characters results in a decrease in the radio send energy of approximately 1.5 times (or 1.8 dB). In view of the above, the gain is 4.2 dB.

Formula p 3 about b retep 1

A three-way phase communication system containing on the non-interrupting side a message converter, a generator whose output

It is connected by one input of a phase modulator, and is noliko usi.tit1.1, the output of which is connected to the line and, on the other side, is a low-frequency amplifier, a band-pass amplifier, the output of which is connected to the input

The phase detector and the input of the ami- lithic detector, the output of which through the nosledovatelio connected narrow-band filter and the strobe pulse generator is connected to one input of the first gating unit, is different from that. that, in order to improve noise immunity, the first adder, the first rectifier and the second adder, the second output of which through the entered

serially connected first element

delays and the first pulse shaper are connected to one output of the message converter, which is connected to one input of the first adder, the other input of which is connected to another output of the message converter, which is connected to the third input of the second adder via the serially connected second pulse shaper and the second delay element, output through which the second rectifier is connected to another input of a bandpass amplifier, the input of which is connected to the output of a phase modulator, another the input of which is connected to the output of the second adder, and on the receiving side three delay elements, two gating blocks, two controllable inverters, an adder and an amplitude selector are inputted, the output of the phase detector through the first delay element connected in series, the first strobe unit, the first inverter to be controlled and the adder is connected to the input of the low-frequency amplifier, where the output of the phase detector is connected via a serially connected second delay element, a second gate unit, a second controlled and The inverter and the third delay element with another input of the adder and through the third gate unit - with the input of the amplitude selector, the outputs of which are connected to other inputs of the first and second controlled inverters, and the output of the strobe pulse generator is connected to other inputs of the second and third gate blocks.

Sources of information taken into account in the examination

1. USSR author's certificate No. 485694, cl. And 04B 7/16, 07/18/73.

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