SU1168892A1 - Subtracting device for pulse-frequency signals - Google Patents

Abstract

A READING DEVICE FOR FREQUENCY-PULSE SIGNALS containing the first and second sources of pulse-frequency signals, in series with each of which are connected the corresponding clock unit and element AND whose outputs are outputs of the device, the trigger, clock and installation inputs of which are connected to the outputs of the first and the second clock unit, and the output to the second input of the first element I, as well as the source of clock HMnyvTbcoB, connected to the clock input of one of the clock units, differing With the fact that, in order to expand its functionality by introducing non-linear signal conversion, it additionally contains a second trigger, the setup and clock inputs of which are connected to the outputs of the first and second clock units, respectively, and the output to the second input of the second element And inputs blocks clocking combined.

Description

O5 00 00

with

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Fig. /

The invention relates to a pulse and digital technique and can be used, for example, in automatic frequency control devices for generating a control error signal (error) in the frequency-pulse mode.

The purpose of the invention is to expand the functionality of the device by introducing a non-linear conversion of the subtracted signals, i.e., deadband in frequency.

FIG. 1 shows the block diagram of the proposed subtractive device; in fig. 2 - time diagrams of his work.

The device contains the first 1 and second 2 blocks of clocking, the first 3 and second 4 triggers, the first 5 and second 6 elements And, the first 7 and second 8 sources of frequency-pulse signals, the source 9 clock pulses.

The first and second diagrams (Fig. 2) show the input frequency-pulse sequences fix, and in2, on the third - clock frequency fr, on the fourth and fifth, signals fi and h at the outputs of blocks 1 and 2 clock, on the sixth and seventh - signals Qs and Q4 at the outputs of the flip-flops 3 and 4, on the eighth - the differential frequency-pulse signal.

The device works as follows.

The input pulse frequency signals fax, and f "x2 come from sources 7 and 8 (such as, for example, a given frequency and frequency of the generator stabilized by an automatic system) to blocks 1 and 2 clocks, in which each the input pulse to the nearest clock pulse ft, given by the generator 9 clock pulses. When the pulses from the outputs of blocks 1 and 2 clocking (fi and {2) coincide, the switching of the flip-flops 3 and 4 does not occur, since the pulses go simultaneously to the clock and the set inputs. If these. the pulses do not match, the triggers 3 and 4 switch over the falling edge of the pulses at the clock inputs and return to the initial state along the leading edges of the pulses at the installation inputs, according to the conditions of the appearance of the pulses at the inputs of the coincidence circuits

.

 f ". f ",

"1" g fx

Thus, the characteristic of the subtracting device has a dead zone. The outputs of the elements And 5 and 6 form, respectively, positive and negative values (f "j,).

Claims (1)

A SUBTRACTIVE DEVICE FOR FREQUENCY-PULSE SIGNALS, containing the first and second sources of pulse-frequency signals, in series with each of which are connected the corresponding clock unit and the element And whose outputs are the device outputs, a trigger, the clock and installation inputs of which are connected to the outputs of the first and the second clock blocks, and the output with the second input of the first And element, as well as a clock source connected to the clock input of one of the clock blocks, distinguishing the fact that, in order to expand its functionality by introducing a non-linear signal conversion, it additionally contains a second trigger, the installation and clock inputs of which are connected to the outputs of the first and second clock blocks, and the output - with the second input of the second AND element, clock inputs _from clock units are combined. 5s Oh oo oo ke Fig.}