SU590863A1 - Device for compensating for telegraphic signal distortions of the 'dominance' type - Google Patents

Description

one

The invention relates to telegraph technology and can be used in the receiving part of voice telegraphy equipment to eliminate the prevalence in received telegraph signals.

A device is known for compensating for the distortion of the type of "predominance in telegraph signals, containing its series-connected comparator unit and driver of the control signal 1.

However, this device is characterized by the impossibility of controlling and adjusting distortions such as "the predominance of telegraphic signals directly during transmission and, in addition, the insufficient accuracy of the computation of these distortions.

The aim of the invention is to improve the accuracy of the compensation compensation of the type of "predominance."

To this end, a waiting generator of reference pulses was inserted into the device for compensating distortions of the type "dominance in telegraph signals, containing a series-connected comparison unit and a driver of a control signal, the output and input of which are connected respectively to the first and second inputs of the comparison unit.

FIG. 1 shows a structural electrical circuit of the proposed device; in fig. 2 - time diagrams of the device.

A device for compensating distortions of the type "dominance in telegraph signals, containing a series-connected comparison unit 1 and a control signal generator 2, introduced a waiting generator 3 reference pulses, the output and input of which are connected to the first and second input of the comparison unit I (Fig. 1 ).

The device works as follows.

P1 pulses of the received telegraph signal (Fig. 2a) from the output of the threshold device 4 are fed to the input of the standby generator 3 reference pulses, and as each telegraph pulse arrives, a reference pulse is generated at its output (Fig. 26). The duration of this pulse is determined by the correlation

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e

the duration of the reference pulse;

That is the duration of an elementary telegraph parcel at a given wiring speed; Atmax - an increase in the duration of the elementary telegraphic premise due to the presence of dominance with the greatest influence of distortion factors (30-35% of that).

Each generated reference pulse and telegraph pulse, which aroused it, arrive at the inputs of Comparison Unit 1.

At its output, an emulsion of the difference between the durations of the input signals is formed only if this telegraphic package is elementary. Otherwise, the signal at the output of the comparison unit 1 is absent. The emulsion of the difference (Fig. 2c) at the output of the comparison unit 1 is formed due to the difference in the duration of the received elementary telegraph parcel and the reference pulse

(about ± D),

where / p is the pulse duration of the difference;

± Dt - change in the duration of the elementary telegraphic parcel due to the presence of prevalences.

The duration of the difference pulse will vary with a change in the magnitude of the dominances in the received telegraph signals.

The resulting difference pulse (g) enters the input of the driver 2 of the control signal, after which a voltage is set at its output (fig. 2d) proportional to the pulse duration p at the input. This voltage is kept immeasurable until the control signal 2 of the difference pulse at the input of the former 2 is received. This quality is achieved through the use in the driver 2 of the trigger signal of the trigger divider with the direct conversion of the code combinations of the states of the trigger into voltage. Before each post-spacing of a new pulse of difference, the states of the converter triggers are reset.

From the output of the driver 2 of the charging signal, the voltage enters the control circuit of the threshold device 4 and changes its threshold depending on the magnitude of the dominance in the received telegraph signals.

This achieves a predominance. In the absence of dominance at the output of the driver 2 of the control signal, such a voltage is established that its effect on the operation of the apparatus is absent. Thus, the proposed device in

voice telegraphy equipment can prevent distortion such as "predominance no matter what factors it causes. There is no need to transmit to the channel.

Due to special control signals, it is not necessary to manually adjust the received control signal before starting the transmission of working telegraph signals, while at the same time it is possible to control and automatically eliminate dominances during the transmission of messages.

 about rmu l and inventions

A device for computational distortion of the type "dominance in telegraph signals, comprising a series-connected comparison unit and a control signal generator, characterized in that, in order to increase the compensation accuracy, a waiting generator of reference pulses is inserted into it, the output and input of which are connected respectively to first and second inputs

block comparison.

Sources of information taken into account at the examiner

1. Emel Nov. A. A. Frequency wiring. M., “Svy, 1966, p. 65-67.

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