SU746571A1 - Device for subtracting and adding pulse trains with pulses of reference frequency - Google Patents

Description

(54) DEVICE FOR READING AND SUMMING

PULSE SEQUENCES WITH PULSES OF ONOPHCrf FREQUENCY

one

The invention relates to automation and computer technology and can be used, in particular, in pulse automagical systems.

A device for subtracting and summing sequences of pulses, comprising triggers, an OR element, and AND i elements, is known.

The disadvantage of the device is limited functionality and low reliability.

It is also known a device containing a trigger, elements and and or and element 2.

The disadvantage of the device is insufficient functionality.

Closest to the present invention is a device for subtracting and summing pulse sequences with reference frequency pulses, containing a reference frequency generator connected by a first output to the first input of the synchronization unit and connected by a second output to the first input

a subtraction unit, the output of which is connected to the first input of the OR element, connected by an output to the output of the device and connected by a second input to the output of the summation unit, the first input of which is connected to the first output of the reference frequency generator. The output of the synchronization unit, connected by a second input to the input of the pulses, is a summed or subtracted sequence,

10 is connected to the second input of the summation unit to the com- munication through a kipp-relay with the second input of the subtraction unit, the third input of which is connected to the output of the trigger connected by the inputs to the inputs of the summation and subtraction control 3}.

The device does not allow combining in time the operations of summation and subtraction of two sequences of pulses with pulses of the reference frequency, and also does not allow for insensitivity to changes in the frequency of the reference oscillator. 7 The aim of the invention is to expand the functionality of the device by combining the summation and subtraction operations over time. To this end, a device for subtracting and summing sequences of pulses with reference frequency pulses, comprising a reference frequency generator connected by a first output to the first input of a synchronization unit and connected by a second output to a first input of a subtraction unit whose output is connected to the first input of the OR element connected output with the output of the device, additionally introduced two elements AND and a period selection block connected by an output to the second input of the subtraction unit and connected by the first input to the first the reference frequency generator, with the first element And connected by inputs respectively to the input of summable frequency pulses and the input of summation control, is connected to the second input of the synchronization unit, the output of which is connected to the second input of the OR element, and the output of the second element And connected by the inputs to the corresponding input the subtracted frequency pulses and the subtraction control input are connected to the second input of the period selection block. The block diagram of the device is shown in the drawing. The device for subtracting and summing pulse sequences with the reference frequency pulses contains the first 1 and second 2 elements AND, the generator 3 of the reference frequency, the synchronization unit 4, the period selection block 5, the subtraction unit 6 and the OR element 7 connected to the output of the device and connected to the inputs of the outputs of the block 6 of the block and the block 4 sync. The first output of the generator 3 is connected to the first inputs of the synchronization unit 4 and the period extracting unit 5. The second output of the generator 3 is connected to the first BXO house of the block 6, connected by the second input to the output of the period extracting unit 5. The inputs of element 1 And, connected to the output with the second method of synchronization block 4, are connected to the input 8 of the impulses of a summable frequency and input 9 of the control of the summation. The inputs of the element II.connected by the output are connected to the second input of the period selection block 5 to the input 10 of the pulses of the subtracted frequency and the input 11 of the subtraction control. The device works as follows. The generator 3 of the reference frequency produces at its outputs a sequence of pulses of the same frequency, shifted relative to each other by half a period. The impulses of summed frequency from input 8 in the presence of a permitting signal at input 9 pass through element 1A to the second input of synchronization unit 4. For each pulse of the summed frequency, block 4 of synchronization 4 extracts another pulse from the sequence of pulses from the first output of generator 3. The synchronized pulses from the output of block 4 arrive at the input of element 7 OR. The pulses of the frequency to be subtracted from input 10 in the presence of a permissive signal at input 11 pass through the element AND 2 to the second input of the period extracting unit 5. For each pulse of the subtracted frequency, block 5 generates a pulse whose duration is equal to the period of the following reference frequency pulses from the first generator output 3. Each generated pulse from the output of block 5, entering the second input of subtraction unit 6, prevents the corresponding reference frequency pulse from the second generator output 3. Thus, at the output of block 6, subtracting them & a sequence of pulses of the reference frequency minus from it a number of pulses that is equal to the number of pulses to input 10 for the duration of the enable signal at input 11 of the device. The pulse sequences from the output of block 4 of synchronization and from the output of block 6 of subtraction are summed on the element 7RI, and the result of the summing goes to the output of the device. At different frequencies of the following pulses at inputs 8 and 10 and the permitting potentials at inputs 9 and 11, the frequency at the output of element 7 OR is greater than the frequency of generator 3, if the frequency at input 8 is greater than the frequency at input 10, or less than the frequency of generator 3, if the frequency at input 8 less than the frequency at input 10. At the same time, the difference between the frequency of the generator 3 and the frequency at the output of element 7 OR is equal to the frequency difference at the inputs 8 and 10 of the device.

5.7

Claims (3)

1. QCCP copyright certificate 20 No. 450346, cl. H 03 K 13/20, 1973. 2. USSR author's certificate No. 585601, cl. H 03 K 13/20, 1976. 3. USSR author's certificate number 265187, cl. H 03 K 23/26, 1965 5 (prototype).