SU1377887A1 - Telecontrol signal transceiver - Google Patents

Abstract

The invention relates to a communication technique and can be used to transmit digital information with a pulse-width modulation. The purpose of the invention is to improve the noise immunity. The device contains on the transmitting side 1 a generator of 2 pulses, a delay element 3, a pulse shaper 4, an AND 5 element, a counter 6, a register 7, a commator 8 and a transmitter 9. The transmitting side is connected to the receiving side 11 containing the receiver by means of a communication line 10. 12, integrator 13, threshold element 14, gate driver 15, element 16, pulse width limiter 17, pulse expander 18, counter 19, first 20 and second 21 registers. The input signal from the output of the register 7 using the imaging unit 4 and the switch 8 generates an output signal, the duration of which is different for a logical zero and a logical unit. On the receiving side of the expander 18 generates pulses, the duration of which is longer than the duration of the pulse

Description

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co logical zero and less than the duration of the pulses of a logical unit. At the same time, information is recorded in the register 20. The pulses from the spreader 18 are fed to the input of the counter 19, which when received

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1377887

through the element 16, information is written to the buffer register 21. If the specified number of pulses is not received, the recording in register 21 is not made and, thus, the device does not receive a distorted output.

a given number of pulses resolution. 4 il.

The invention relates to a communication technique and can be used for transmitting digital information with pulse width modulation.

The purpose of the invention is to increase the noise immunity. Figure 1 shows the functional diagram of the device: figure 2, 3 and 4 show temporary diaphragms explaining the operation of the device.

The device (Fig. 1) contains on the transmitting side 1 a generator of 2 pulses, a delay element 3, a pulse shaper 4, an AND 5 element, a counter 6, a register 7, a switch 8 and a transmitter 9. The transmitting side is connected by line 10 receiving side 11 containing receiver 12, integrator 13, threshold element 14, gate driver 15, AND element 16 limiter 17 pulse duration, pulse expander 18, counter 19, first 20 and second 21 registers

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The device works as follows.

On the transmitting side 1, the rectangular pulses produced by the generator 2, through the element 5, arrive at the counter 6 and the shift register 7. The beginning of the arrival of pulses is determined by the signal from the delay element 3 arriving at the second input of element 5. The information recorded in shift register 7, under the action of pulses from the output of element 5, arrives at the input of switch 8. The second input of switch 8 from the output of driver 4 pulses are received, with a period T (, and duration T | and Tj (FIG. 2a5b). Depending on which signal comes from the output of the shift register 7, the output of the switch

8 an impulse of either a duration T ,, or a duration T is formed, with an impulse of duration T corresponding to transmission 1, and an impulse of duration T corresponding to a transmission. Fig. 2b shows a group of pulses corresponding to the transmission on the first channel O, and on the remaining HbiM channels - 1. From the output of the switch 8, the pulses through the transmitter 9 are sent to the communication line 10 and then to the input of the receiver 12 of the receiving side 11. From the output of the receiver 12 pulses (Fig. 3a) arrive at the input of the pulse width limiter 17, the output of which produces short pulses (Fig. 3b), the front of which coincides with the leading edge of the pulses at the output of the receiver 12. These pulses arrive at the input of the pulse width expander 18 where formir are pulses whose duration is longer than the duration O. pulses but less than the durations

these pulses 1. Here pulses are formed whose fronts coincide with the trailing edge of the extended pulses (Fig. 3). The output signal from the expander 18 of the pulse duration is fed to the counting input of the counter 19 and the synchronization input of the shift register 20; The information input to the shift register 20 is received from the output of the receiver 12. Thus, information from the link 10 to the shift register 20 is recorded. Simultaneously, from the output of the receiver 12, the signal is fed to the input of the integrator 13. If there is a signal at the input of the integrator 13, the charge e occurs with a small time constant (G), and in the absence of a signal, the capacitance from the large pos (r 3-4

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this time of the hour — o– -c of the output of the integrator 13 (Fig. 3g) is fed to the input of the threshold element 14, at the output of which a pulse is formed (FIG. 3d), the duration of which is equal to the time during which the amplitude of the signal at the output of the integrator 13 exceeds the threshold of the threshold element 14. From the output of the threshold element 14, the pulse arrives at the input of the imaging unit 15 st. bov. Two strobes are formed at the output of the latter: the first (fig.ze) coincides with the leading edge of the input signal, the second (fig.Zh) coincides with the trailing edge of the signal at the input of the gate driver 15. The first gate arrives at the input of the installation of the counter 19 to the initial state. The counter 19 is reset to the initial state before the first pulse is recorded in the shift register 20. Thus, when the first pulse arrives at the input of the receiving side 11 from the communication line 10, the counter 19 is reset to the initial state, then the signal is written to the shift register 20 and the content of the counter 19 is increased by one. When each subsequent pulse arrives from the communication line 10, it is written to the shift register 20 and the content of the counter 19 is increased by one. The state of the counter 19 is shown in FIG. When the receiving side 11 arrives at the input from the line 10 of the N pulses, the state of the counter 19 becomes equal to N and a level 1 is formed at its output (Fig. 3k), which enters the second input of the element 16 and allows the strobe passing to the first input element And 16 from the output of the former 15 strobe. From the output of the element AND 16, the strobe (FIG. 3L) is fed to the input of the recording control in the buffer register 21 of information received from the outputs of the shift register 20.

If there is interference on the link 10, the device does not differ from the one described above, except that the state of the counter 19 becomes different from N, the level 1 at the output of the counter 19 is not formed (Fig. 4k), which prohibits the formation of a strobe element 16 and (Fig. 4l), and the recording of information in the buffer register 21 is not made.

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Claims (1)

The use of the device in systems for collecting, transmitting and processing information using the telecontrol channel makes it possible to increase the reliability of the received information by eliminating errors in the transmission of telecontrol signals. Invention Formula A device for transmitting and receiving telecontrol signals containing on the transmitting side a pulse generator, a counter, a switch, the output of which through a transmitter is connected to a communication line, on the receiving side, a device contains a receiver whose input is connected to a communication line, the output of a receiver through a pulse width limiter connected to the input of the pulse width extender, and a counter, characterized in that, in order to increase the noise immunity, a delay element is inserted into the device on the transmitting side, the driver pulses, the element And the register, the output of the pulse generator is connected to the first input of the element And and through the shape. the pulse is connected to the first input of the switch, the output of the delay element is connected to the second inputs of the switch and the element AND whose output is connected to the first input of the register and through the counter to the first input of the delay element whose second input is the first input of the device, the output of the register is connected to the third input of the switch, the second input of the register is the second input of the device, the generator, generator, threshold element, strobe driver, And element and registers are entered at the receiving side, the receiver output is connected to the first input ode first register and through series-connected integrator and a threshold element - with the input of the gate generator, the first and second outputs of which are connected to the first inputs of the And element and the counter, the output of which is connected to the second input of the element And, the output of which is connected to the first input of the second register, the pulse width expander output is connected to the second inputs of the counter and the first register, the outputs of which are connected to the corresponding second inputs of the second register, the outputs of which are outputs and devices. LR s l ... ... l m at Ю® / Х / V- / хл # R J7 0 // e.J Jl .G1 . g g l L P to PA nofjs y d Well  1 2 X j l Fi &