SU439929A1 - SELECTOR FOR PULSE ASYNCHRONOUS COMMUNICATION SYSTEMS - Google Patents

Description

one

The invention relates to the field of signal transmission, namely, selectors for human asynchronous communication systems.

A selector for pulsed asynchronous communication systems with time-pulse modulation is known, containing a delay line with taps connected to the corresponding inputs of a coincidence circuit fixing an address group, an integrator, a delay line with a delay value slightly greater than the maximum possible pulse duration of coincidence and fadron, which is the output of the selector.

This device is ineffective because the address pulses arriving at the selector input have a different amplitude, which affects the position in time and decoded pulses.

In order to reduce the influence of the amplitude changes of the input pulses on the time position of the decoded pulses, the output of the coincidence circuit fixing the address group is simultaneously connected via the input and output of the delay line with a delay value slightly longer than the maximum possible duration of the coincidence pulse, and through the first input and output of the integrator - to the second input of the fadron, the output of which is connected to the second input of the integrator.

FIG. I is a block diagram of the selector; in fig. 2-time diagram of his work.

The following notation is taken: a - conversion of a change in the level of a bell-shaped pulse into a change in position on the time axis of the leading and trailing edges; b - pulses of the address group at the input of the selector; c - coincidence pulse at the input of the coincidence circuit; d is the positions of the leading edges of the pulse coincidence at different levels of the input pulses; e is the position of the leading edges of the coincidence pulses at the output of the delay line; f, f - pulses taken from fadron.

The selector contains delay lines 1, 2, coincidence circuit 3, integrator 4, fadron 5.

The operation of the selector proceeds as follows.

The amplitude-normalized pulses are fed to the input of the delay line 1, whose taps are located in accordance with the address AODC. As shown in FIG. 2, a, the leading and trailing edges of these pulses change their position on the time axis depending on the level of the input signal. From the output of the coincidence circuit 3, a coincidence pulse (Fig. 2, c) is fed to delay line 2 and to integrator 4. Line 2 of delay is chosen somewhat longer than the maximum possible duration of the coincidence pulse. The voltage at the output of integrator 4 at the time of the termination of a pulse coincides directly in proportion to its duration. This voltage is controlled by the phanostron 5 in such a way that the duration of the pulse it forms is equal to half the duration of the coincidence pulse. The phanostron 5 is triggered by the leading edge of a coincidence pulse that has passed through delay line 2. Thus, fadrone 5 ends to generate a pulse at the same time instant (Fig. 2, e, e, g, regardless of the level of the pulses at the selector input (Fig. 2, a).

Subject invention

A selector for pulsed asynchronous communication systems with time-pulse modulation, containing a delay line with taps connected to the corresponding inputs of a coincidence circuit, fixing an address group, an integrator, a delay line with a delay value slightly greater than the maximum possible pulse duration of coincidence and fadron, output which is an output of the selector, characterized in that, in order to reduce the influence of amplitude changes of the input pulses on the position during

the time of the decoded pulses, the output of the coincidence circuit, fixing the address group, is simultaneously connected via the input and output of the said delay line with a delay value somewhat greater than

the possible duration of the coincidence pulse, to the first input of the fadron, and through the first input and output of the integrator to the second input of the fadron, the output of which is connected to the second input of the integrator.

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