SU813754A1 - Pulse selector - Google Patents

Description

(54) PULSE SELECTOR

I

The invention relates to a pulse technique and can be used in devices for the separation of pulses by duration.

A pulse selector is known that contains a first standby multivibrator whose input is connected to the input bus and an output to the first inputs of the first and second And elements and inputs to the second and third waiting multivibrators, the outputs of which are connected respectively to the second inputs of the first and second elements. And, the element of the ban, the two inputs of which are connected respectively with the inputs of the first and second elements And 1.

A disadvantage of the known device is that it has a limited range of changes in the periods of input pulses.

The closest in technical essence to the present invention is a device containing triggers, a differentiating element, the output of which is connected to the first input of the first trigger, two single-oscillators, AND elements, AND-NOT 2 elements.

However, this device provides

selection

Duration

It)

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multivibrator trigger two railway 1tsih

two AND elements and a prohibition element, three multivibrators, two OR elements and three additional rujiiihh elements are introduced, the inputs of the first two of which are connected to the outputs of the second trigger, whose inputs are connected to the output of the third waiting multivibrator, the input of the differential element, the input of the first an additional differentiating element and the first input of the first element AND, the output of which is connected to the second input of the first trigger, and the second input through the first OR element with the outputs of the fourth and fifth multiviews ibrators, the inputs of which are connected to the outputs of the first and second additional differentiating elements and the inputs of the first and second waiting multivibrators, the outputs of which through the second element OR are connected to the first input of the second element AND, the second input of which is connected to the output of the third additional differentiating element, and the output to the first input of the prohibition element, the second input of which is connected to the output of the first trigger.

The drawing shows a structural electrical circuit of the device.

Pulse selector contains pending multivibrators 1-5, prohibition element 6, trigger 7 with counting input, elements OR 8 and 9, trigger 10 elements AND 11 and 12, input 13 and output 14 and 15 tires, differentiating elements 16-19.

The input of the multivibrator 1 is connected with a length of 13, and the output is connected to the inputs of the trigger 7, elements 18 and 19, and the first input of an AND 12 element, the second input of which is connected through the OR 9 element to the outputs of the multivibrators 3 and 5, whose inputs are connected through the elements 16 and 17c trigger outputs 7 and directly with the inputs of multivibrators 2 and 4, the outputs of which through the element OR 8 are connected to the first input of the element 11, the second input of which is connected to the output of the element 19, and the output - to the information input of the prohibition element 6, the output of which connected to bus 14 and the control second input - to the output of flip-flop 10, zero input of which is connected to the output member 18, and the unit - a yield of AND 12 and 15 schinoy.

The device works as follows.

The first input pulse starts multivibrator 1, which forms it; ibc with duration T,. On the falling edge of this pulse, trigger 7 is triggered. The leading edges of positive voltage drops at outputs of trigger 7 are extracted by elements 16 and 17 for simultaneous launch of either multivibrators 2 and 3 or multivibrators 4 and 5, while multivibrators 2 and 4 produce pulses with a duration of 2, , and multivibrators 3 and 5, and m. - the time of the generated pulses of the elements OR 8 and 9 form the permitting potentials at the second inputs of the elements 11 and 12.

If the period of the following input pulses is longer than the total duration of the pulses produced by multivibrators 1 and 2 or multivibrators 1 and 4, i.e. T + TI. , then at the output of the element And 11 pulses are not formed. They are also absent at the output of the element 12. This means that the frequency of the input pulses is less than the lower limit of the passband of the pulse selector. If the pulse period T is less than sum.m.r pulse duration of multivibrators 1 and 2 or multivibrators 1 and 4, but longer than the total pulse duration produced by multivibrators 1 and 3 or multivibrators 1 and 5, i.e. T + + 4 T G | , then at the output of the element 11, pulses appear which pass through the element 6 of the ban on the splint 14,

since the control potential of the prohibition element 6 retains the permissive potential. On bus 15, the pulses are still missing. This means that the pulses are input to the device with a frequency

lying in the pass field of the device. When impulses appear at the device input, the period of which is shorter than the total duration of the pulses produced by multivibrators 1 and 3 or multivibrators 1 and 5, i.e. T. T. (-i-Ti,

At the output of element 12, there appear pulses that trigger the trigger 10, which forms the inhibitory potential at the control input of the prohibition element 6, so that the pulses arriving at its information input from the output of element 11 are not pass t per bus 14. The presence of pulses on the bus 15 indicates that the frequency of the input pulses is above the passband of the device.

5 For accurate operation of the pulse selector, it is necessary that the inhibit pulses at the control input of the inhibit element 6 have a longer duration than the pulses arriving at its information input. This is achieved by connecting to the first input of the element AND AND of the element 19 with a larger, more than, signal propagation time between the output of the multivibrator 1 and the control input of the prohibition element 6. To form the triggering 5 pulses at the inputs of the multivibrators 2-5 and the reset pulse on the trigger 10, the device includes elements 16 and 17.

By changing the duration of the pulses produced by the multivibrator 1, the position of the bandwidth of the device on the frequency scale can be changed, and by changing the duration of the pulses produced by the multivibrators 2 and 4 and 3 and 5, it is possible to expand or narrow the bandwidth of the device. In addition, the proposed device jj allows to remove restrictions from the magnitude of the periods of selective pulses.

Claims (2)

Invention Formula A selector pulse that contains two 50 flip-flops, a differentiating element, the output of which is connected to the first input of the first trigger, two waiting multivibrators, two AND elements and a prohibition element, characterized in that, in order to expand its functionality, three waiting for a multivibrator, two OR elements and three additional differentiating elements, the inputs of the first two of which are connected to the outputs of the second trigger, the inputs of which are connected to the output of the third waiting multivibrator, the input of the differentiating element the first additional differentiating element and the first input of the first element AND, the output of which is connected to the second input of the first trigger, and the second input through the first OR element with the outputs of the fourth and fifth waiting multivibrators, the inputs of which are connected to the outputs of the first and second waiting multivibrators whose outputs through the second element OR is connected to the first / 3 the input of the second element And, the second input of which is connected to the output of the third additional differentiating element, and the output - to the first input of the prohibition element, the second input of which is connected to the output of the first trigger. Sources of information taken into account in the examination. USSR Author's Certificate No. 570996, cl. H 03 K 5/18, 1977. 2. USSR author's certificate in application number 2634953, cl. H 03 K 5/20, 1978.