SU1257856A1 - Simplex telephone communication system - Google Patents

Abstract

The invention relates to electro - communication. The communication range along the power lines is increased. The system includes on the transmitting side a microphone unit 1, a tone frequency filter (FFC) 2, a transmitter 3 with frequency modulation of signals, a tonal frequency generator 5 and its switch-on unit 4, on the receiving side filter 6, receiver 7 with frequency demodulation of signals, FFC 8, power amplifier 9, loudspeaker 10 and receiver I1 of overtonal frequency, as well as power line 12, N intermediate points (PP) 3 amplification and signal conversion, (N-1) barrier 1X blocks (BZ) 14 and block n Renos spectrum (BTS) 15. The signals generated by transmitter 3, sequentially pass - usi- li1olnye portions received at input PP 13 where amplification is performed and the limitation of their amplitude, frequency division FM signal n times and power gain. Thereafter, the amplified FM signal located in a predetermined frequency range enters the power line 12. ST 14 serves to prevent self-excitation in the system, which may occur due to the fact that the signals from the subsequent AP 13 return to the input of the previous AP 13. The target is achieved by the introduction of PP 13, ZB 14 and BPS 15. Examples of the implementation of PP 13 and ZB 14 are given. f-ly, 3 ill. (L go ate CX) ate o (ri8, t

Description

The invention relates to telecommunications, namely to the telephone control room on the contact network of electrified transport, and can be used on various power lines.

The purpose of the invention is to increase the communication range along the power lines.

FIG. Figure 1 shows the structural electrical circuitry of the simplex telephone communication system of Figure 2, the structural electrical circuitry of the interim amplification and conversion point; in fig. 3 - structural electrical circuit of the barrier unit.

The simplex telephone communication system on the transmitting side includes a microphone unit 1, the first FFC 2, a transmitter 3 with frequency modulation of signals, a unit L of turning on the generator and a generator 5 of overtonal frequency, on the receiving side a band-pass filter 6, a receiver 7 with frequency demodulating signals , second FFC 8, power amplifier 9, loudspeaker 10, receiver of overtonal frequency 11, as well as power line 12, N of intermediate points 13-13 of signal amplification and conversion, (N-1) barrier blocks 14 and BPS 15, and intermediate point 13 mustache laziness and signal conversion contains a bandpass filter 16 upper frequency band (VLP), band pass filter 17 lower frequency band (NFC), the first 18 and second 19 switching units, the amplifier-limiter 20 VLP, the amplifier-limiter 21 - NFC, FM detector 22 HPV, FM detector 23 PNCH, the first and second receivers: kn 24 and 25 supratonal frequency, frequency divider 26, frequency multiplier 27, adder 28 and power amplifier 29, while the barrier unit 14 contains a low frequency filter 30, the first limiter - Tel 31 at a minimum, the receiver 32 NP with frequency demodulation signals, the first receiver of the overtonal frequency 33, the band-pass filter of the HPV 34, the second limiter 35 at the minimum, .the receiver of the HPV 36 with frequency demodulation of the signals, the second receiver of the 37th overtonal frequency, the first 38 and the second 39 connection blocks

five

0

0

0

low-frequency shunt 40 HPV and high-frequency shunt 41 NPCH,

The simplex telephone system operates as follows.

When the generator 4 is turned on, the generator on the transmitting side is energized on the over-tone frequency generator 5, which produces a harmonic signal with a frequency outside the effectively transmitted frequency band of the talked spectrum for the session time. As a result, the signal with the overtonal frequency is fed to the input of the transmitter 3 with frequency modulated signals, producing a FM narrowband signal in the frequency range uf, whose average frequency is equal to fр. From the microphone unit 1

0. Through the first filter 2 tone frequencies to the input of the transmitter 3 also receives speech signals.

At intermediate point 13, amplification and conversion of the signals in the initial state are first 18 and second

19, the switching units are in a state in which the band-pass filters 16 and 17 are connected to the corresponding limiting amplifiers.

20 and 21. Band-pass filters 16 and 17 are band-pass filters with non-overlapping bandwidths f, and 4 f, with the average frequency of the range uf being (where n is an integer). I

The signals produced by the transmitter 3 pass through the first amplifying section, arrive at the input of the first intermediate point 13 of amplification and signal conversion, where they pass through the band-pass filter 16 and the first switching unit 18, are amplified and limited in amplitude by the limiting amplifier 20 and fall on the input of the frequency divider 26, which divides the frequency of the FM signal by n times, as a result of which the spectrum of the FM signal falls in the frequency range of 6 f2. Then converted into the frequency range D f FM signal through the adder 28 is fed to the input of the amplifier 29 power. In addition, the FM signal from the output of the amplifier-limiter 20 is fed to the input of the FM-detector 5 of the detector 22, the output of which is a low-frequency signal. The first receiver 24 of the over-tonal frequency receives the over-tonal frequency, and at its output 5

A control signal arrives at the control input on the other side of the switching unit 19. As a result, the second switching unit 19 switches the output of the power amplifier 29 to the band-pass filter 17. The amplified FM signal with a spectrum located in the frequency range ufj enters the power line 12.

When this signal arrives at the input of the next intermediate point 13, amplification and conversion of signals connected to the 12 V line. At the end of the next amplifying station, it passes through a band-pass filter 17, a second switching unit 19 and a limiter amplifier 21 and is fed to the input of a frequency multiplier 27, which multiplies the frequency of the FM signal by and times. As a result, the spectrum of the FM signal is transformed from the frequency range i f2 to the frequency range uf |. The signal from the output of the frequency multiplier 27 through the adder 28 is fed to the input of the amplifier 29 power. In addition, as in the previous case, the second receiver of the over-tone frequency 25 operates, as a result of which the first switching unit 18 supplies the amplified FM signal from the output of the power amplifier 29 through the band-pass filter 17 to the line 12.

Similarly, amplification of signals by other intermediate points 13 of amplification and conversion of signals is carried out. Barrier blocks IA-IA serve to prevent self-excitation in the system in question, which may occur due to the fact that the signals from the subsequent intermediate point 13 of the amplification and conversion of the signals return to the input of the previous intermediate point 13.

The barrier unit 14, connected to the power line 12 in the interval between two adjacent intermediate points 13, operates as follows.

After a powerful signal appears at the output of intermediate point 13, the spectrum of which is located in the frequency range AF2, this signal passes through the band-pass filter 30 and the first stop 31 at the minimum reaches the input of the receiver 32, the output of which is

ten

t5

20

25

There is a low-frequency signal, which includes a signal with an over-tonal frequency. As a result, the first over-tonal frequency receiver 33 is triggered, which supplies a control signal to the control input of the first connection unit 38. As a result, a high-frequency shunt 40 is connected to the power line 12, which is a two-pole device having a low resistance in the frequency range Af and a large resistance in the frequency range Af.

The next barrier unit 14 has a powerful WTO FM signal.

intermediate point 13 amplification and conversion of signals. The spectrum of this FM signal occupies the frequency range of & f ,. The bandpass filter 34 is a bandpass bandwidth lf, whereby the FM signal passes through the bandpass filter 34, the second limiter 35 is at a minimum and is converted by the receiver 36 into a low frequency signal. The second receiver 37 triggers and sends a control signal to the control the input of the second connection unit 39, which operates and connects the high-frequency knot 41 of the NFC, is parallel to line 12, which is a two-pole circuit having a low resistance in the frequency range uf and a large resistance in the frequency range Af ,. The first and second limiters 31 and 35 are used to a minimum to ensure proper operation, since at the time of loading the first 38 or

The second 39 connection unit at the point of connection of the barrier unit 14 to the line 12 can be acted upon by a strong FM signal from the nearest intermediate point 13 of amplification and signal conversion and a weakened FM signal from a more distant intermediate amplifier. The attenuated FM signal does not pass through the corresponding limiter 31 (35) at a minimum and does not cause the false operation of the barrier unit 14.

Consider the operation of the circuit on the receiving side. Here, two options are possible, depending on the location of the transmitting part of the moving object along the seepine line 12.

1. To the input of the band-pass filter ft, a sufficiently powerful FM signal is received that occupies the frequency spectrum if ,.

thirty

35

0

five

0

and a weak FM signal occupying the kf-i frequency spectrum,

2. The input of the bandpass filter 6 is a sufficiently powerful FM signal, which occupies the frequency spectrum fcfj, and a weak FM signal, which occupies the frequency spectrum, and f ,. Band-pass filter 6 skips both if, and & f frequency ranges. The spectrum transfer unit 15 is a non-linear element with the following characteristic:

i.kgk, i, -, ь, ...

and at its output in both cases there is an FM signal occupying the frequency range & f. Receiver 7 converts this FM signal into a low-frequency signal, a talk signal and a control signal appear at its output, i.e. On the frequency. From the latter, the over-frequency receiver 11 is activated, after which the power amplifier 9 is triggered, which transmits 10 talk currents to the loudspeaker. The second FFC 8 serves to prevent the tonal frequency from reaching the loudspeaker. At the end of the conversation on the transmitting side, the generator switching on unit 4 is turned off, the generator of the overtonal frequency 5 stops working and the control signal disappears. The whole service communication device circuit returns to its original state t

Invention Formula

Claims (3)

1. A simplex telephone communication system comprising on the transmitting side a serially connected microphone unit, a first tone frequency filter and a frequency modulated transmitter, as well as a generator switching unit and an over tone generator, the output of the generator switching unit connected to the generator input of a tonal frequency whose output is connected to the input of the transmitter with frequency modulated signals, on the receiving side a band-pass filter connected in series with a frequency demodulation receiver signals, a second tone frequency filter, a power amplifier and a loudspeaker, as well as a tonal frequency receiver, the receiver output with frequency demodulation of signals connected to the tonal frequency receiver input, the output of which is connected to the control input of the power amplifier, while the transmitter output of the frequency module The signal is connected via a power line to the input of a bandpass filter, characterized in that, in order to increase the communication distance along the power lines, N intermediate gain points are inserted in it converting signals, (N-1) barrier blocks and a spectrum transfer unit, the outputs of N intermediate points of amplification and signal conversion are connected in parallel to the power line to the corresponding points, while the conclusions (N-1) of the barrier units are also connected in parallel to the power line to the corresponding points between the connection points of the corresponding N intermediate :: gain points and signal conversion, and the output of the bandpass filter is connected via a spectrum transfer unit with a receiver input with frequency demodulation of signals. 2. The system according to claim 1, characterized in that the intermediate point of the addition and transformation of the signal. the baseband contains a high-pass bandpass filter, a low-pass bandpass filter, first and second switching blocks, an upper-band limit amplifier, a lower-band limit amplifier, a frequency-modulated high-band detector, a frequency-modulated lower-band detector, the first and second receivers of the over tone frequency, the frequency divider, the frequency multiplier, the adder and the power amplifier, the first terminals of the high-pass bandpass filter being connected to the first The outputs of the first switching unit, the second terminals of which are connected respectively to the input of the high-band limiter amplifier, the output of the high-band limiter amplifier, are connected via a frequency splitter to the first input of the adder and the series-connected high-frequency frequency detector and the first receiver with the control input of the second switching unit, the first terminals of the lower bandpass filter are connected to the first terminals of the second switching unit, the second terminals of which are connected respectively to the input of the lower frequency band amplifier; the output of the lower limit band amplifier is connected through the frequency multiplier with the second input of the adder and through the serially connected frequency-modulated low-band detector and the second receiver over the base You are connected to the control input of the first switching unit, and the output of the adder is connected via a power amplifier to the combined third outputs of the first and second switching units, the combined second outputs of the bandpass filters of the upper frequency band and the lower frequency band being the outputs of the intermediate point of amplification and signal conversion. 3. The system of claim 1, wherein the barrier unit comprises a series-connected low-band-pass filter, a first limiter at a minimum, a low-band receiver with frequency demodulation of signals, and a first transceiver frequency receiver, and a series-connected band-pass filter the upper band, the second limiter, the minimum tuner, the upper band receiver with frequency demodulation of the signals and the second receiver of the supratonal frequency, as well as the first and second connection blocks, high pgunt upper-frequency band and high frequency u nt low frequency band, the first receiver supersonic frequency output coupled to the control input of the first connecting unit, first terminals of which are connected with vtodami a high frequency shunt of the upper frequency band, the output of the second tonal frequency receiver is connected to the control input of the second connection unit, the first terminals of which are connected to the high frequency output terminals of the high frequency band, and the combined second outputs of the first and second connection blocks and the lower band pass filter inputs The frequencies and the high band are the outputs of the barrier unit. thebes