SU527835A1 - The input device of the receiver single pole telegraph signals - Google Patents

Description

mentch chaderzhka 1, delaying the input signal at time t3 without changing its shape; voltage divider 2, which divides the input signal without changing its shape; shaper pulse decay 3, prolonging the decline of the input signal; a level selector 4, a discrete signal transducer, designated by a PNI, when the polarity of the signal changes between its inputs; a signal converter 5, which excludes fragmentation, a duration shorter than T, or an attached output signal at a clock frequency, and a repeat text trigger 6, which locks the signal for a time equal to the duration of the elementary parcel.

The device works as follows.

The input signal is fed to the device from a low-pass filter (LPF) or from a wired communication line. In the overwhelming majority of cases, the code premises (Fig. 2a) are not rectangular (Fig. 26), i.e. the front and the bottom of the parcel make up a large part of it. In the limiting case, the front can be equal to the decay and duration of the elementary premise, i.e.

 t.

R sp about

Suppose that the input of the device receives a current of the next. From the beginning of its arrival from the output of the voltage divider 2, through the shaper 3, to one input of the level selector 4, a potential arrives that keeps the selector in its original state. After the delay time Xe of the analog delay element 1 to the second input of the selector also finds a potential (Fig. 2c).

The division factor Kd of the voltage divider 2 is chosen such that the potentials at both inputs of the level selector 4 are the same when the signal at the second input reaches half of its steady-state value (Fig. 2d).

The next time at the output of the level selector 4, the polarity of the signal changes (indicating the arrival of the current parcel), and the text 6 trigger repetition through the signal converter 5 is set to the corresponding steady state. The level 4 selector is in this UGSTRPI as long as the signal level at the nerve input is greater than the signal level at the second

the entrance. In this case, the trigger repetition trigger time does not change its stable state.

Drop Shaper 3 amplifies the decay of the code nocbfJiKH signal at the second input of the level 4 selector to the value at which the signals at its inputs are the same when the signal at the first input is reduced to half of its established value.

At this moment, the polarity of the signal at the output of the level selector 4 is changed, and the text repeat trigger 6 through the signal converter 5 is set to the state corresponding to the best-off parcel (Fig. 2e). Since the polarity of the signal at the output of the level selector changes at times when the level of the signal at the first input of the level selector reaches half its steady-state value, the durations of the parcels at the output of the device are not distorted. This condition is preserved at any amplitude of the signal entering the device, i.e. The trigger threshold of the level selector varies in proportion to the amplitude of the input signal.

Claims (2)

1. Avt.Sv. USSR №319090, cl. H 04 L 1/00, 1970. 2. Avt.Sv. USSR N 418985, cl. H 04 L 1/00, 1972 (prototype). fJepStiiu hod V U-t