SU1292199A1 - Device for reception of telegraph signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is noBtnne reception accuracy. The device contains discriminator 1, trigger 2, meter 3, pause duration, meter 4, signal level duration, r-r 5 clock pulses. The discriminator 1 contains the inverters 6 and 7, the differential el-8. The meter 4 contains the elekt And 9, the counter 10 and the inverter 11. The meter 3 contains the elekt And 12 and the counter 13. 1 Il.

Description

The invention relates to telecommunications and can be used in data transmission systems.

The purpose of the invention is to increase the reliability of reception.

The drawing shows a structural electrical circuit of the proposed device.

The device for receiving telegraph signals contains a discriminator 1, a trigger 2, a meter 3, a pause duration, a meter 4, the length of a signal level, a generator of 5 clock pulses.

The discriminator contains the first 6 and second 7 inverters, the differentiating element 8.

Measuring the duration of the signal level contains the element And 9, counter 10 and inverter P.

Measuring the duration of the pause contains the element And 12 and the counter 13.

 The device works as follows.

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In the absence of a signal (pause) at the input of the device, trigger 2 is in a state of logical hold in the reset state of the counter 10 of the meter 4, the duration of the signal level, while the output of the counter 10 and, consequently, the output of the device is formed and maintained log.O), corresponding to the pause of the input signal, while from the inverter, 11 to the first input element And 9 receives a signal (high level),

preparing the element And 9 to the transmission of the clock pulses of the generator

5 clock pulses. However, the signal from the second output of the discriminator I, which coincides in phase with the input signal, prohibits the passage of the clock pulses of the generator 5 clock pulses through the element 9 to the counting first input of the counter 10. The signal from the first output of the discriminator I enables the counter 13 of the meter 3 to pause and the signal from the third output of the discriminator 1 permits the passage of the clock pulses of the generator 5 clock pulses to the counting second input of the counter 13, so that the meter 3 duration of the second pause counts clock cycles impulses, periodically confirming the zero state of trigger 2 at the next achievement

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selected minimum pause duration.

With the appearance of the leading edge of the input signal at the third output of the discriminator 1, a signal prohibits the passage of clock pulses through the AND 12 element, a short signal from the first output of the discriminator 1 resets the counter 13 of the pause duration meter and sets the trigger 2 to the log state. 1, allowing the counter 10 meter meter duration of the signal level. The signal from the second output of the discriminator 1, which coincides in phase with the input signal, allows the clock pulse generator 5 clock pulses to pass through the AND 9 element to the input of the first counter 10, the meter 4, the signal level duration. When the counter 10 reaches the selected minimum setting of the signal level duration at the output of counter 10, a signal level occurs (for example, log.1), which corresponds to the operating level of the input signal of the device, while from the inverter 11 the first input of the AND 9 element receives a signal (low level) 5 prohibiting the passage of clock pulses to the counting input of counter 10, so that the output of the device maintains a signal corresponding to the operating level of the input signal.

With the appearance of the falling edge of the signal (ie, the leading edge of the pause), the signal from the second output of the discriminator 1 prohibits the passage of clock pulses through AND 9 (in addition to the signal of the inverter 1 1), the signal from the third output of the discriminator 1 allows the passage of clock pulses on the counting input of the counter 13 meter 3 duration pause. Upon reaching the selected minimum pause duration, the signal from the output of meter 3; the pause signal resets trigger 2 and meter 4, the duration of the signal level at the output of which the signal corresponding to the pause of the input signal is generated and maintained. The device is reset.

When receiving an input signal with noise, coinciding in phase with the input pause, the signal, with the appearance of interference, the counting of clock pulses by the counter 10 stops, the counter

13 begins to count the duration of the interference. If the duration of the interference - pause is less than the selected minimum duration of the pause, then the new leading edge of the input signal (after the end of the interference) leads to the formation of a short pulse at the first output of the discriminator 1, which resets the counter 13, confirms a single trigger state 2 and the signal from the second output of the discriminator 1 permits the continuation of the counting of clock pulses by the counter 10 from the state that had arisen by the time of the occurrence of the disturbance - the pause.

Claims (1)

Apparatus of the Invention A device for receiving telegraphic signals, comprising a discriminator, the first output of which is connected to the first trigger input and the first input of the pause duration meter, the output of which is connected to the second trigger input, the output of which is connected to the first input of the signal strength meter, the second input of which connected to the output of the generator. tact pulses and to the second input of the measure pause duration, while; The discriminator input is the input of the device, the output of which is the output of the signal level duration meter, characterized in that, in order to increase the reliability of reception, the third duration meter input Compiled by O. Geller Editor G. Volkova Tehred L. Serdyukova Order 288/59 Circulation 639. Subscription VNIIPI USSR State Committee for inventions and discoveries 113025, Moscow, Zh-35, Raushsk nab., 4/5 Production-poly1) aphic enterprise, Uzhgorod, st. Project, 4 O 5 0 5 0 The signal level is connected to the second output of the discriminator, the third output of which is connected to the third input of the pause duration meter, the discriminator containing two inverters and a differentiating element whose input is connected to the output of the first inverter and to the input of the second inverter whose output is the second output of the discriminator, first the output of which is the output of the differentiating element, the input of which is the third output of the discriminator, the input of which is. pogo is the input of the first inverter, while the signal level duration meter contains an inverter, a counter, and an element, the output of which is connected to the first input of the counter, the output of which through the inverter is connected to the first input of the element and the second and third inputs of which are respectively the second and the third inputs of the signal strength level meter, the first input of which is the second meter input, the output of which is the output of the signal strength level meter, wherein the pause length meter contains the series-connected And element and the counter, the output of which is the output of the pause duration meter, the first, second and third inputs of which are respectively the R input of the counter and the first and second inputs of the element I. Proofreader M.Sharoshi