SU783958A1 - Pulse train shaping device - Google Patents

Description

The invention relates to a pulse technique and can be used in radio installations for various purposes, in particular in automation devices.

A device for generating a series of pulses is used, which is used in radio engineering installations and devices to obtain a series of pulses W

A disadvantage of the known device is the possibility of distortion of the pulses of the series.

Of the known devices for generating a series of pulses, the closest to the proposed technical essence is a device containing a pulse generator, a key device, a counter, a program storage unit, a trigger and a multi-input circuit AND, with the pulse generator through a key device connected to the counter input, output which is connected to the trigger zero input and to the program storage unit, the outputs of the program storage unit that specify the number of pulses in a series are bitwise through a multi-input circuit AND are connected to about the counter, the control output of the prog-1 storage unit of the frame is connected to the input of the multi-input circuit And a single trigger input, the output of which is connected to the input of the key device [2].

The disadvantage of this device is the possibility of distorting the shape of the first pulse of the series, i.e. a decrease in its duration due to the fact that the launch of the device may coincide in

Yu time with the arrival of the pulse from the pulse generator.

The aim of the invention is to obtain pulse-stable pulses.

This is achieved by the fact that, in the device containing the program storage unit, a trigger, the first output of which is connected to the first input of the key element, a pulse generator, the output of which is connected to the second input of the key element, the output of which is connected to the counter input, the outputs of which are connected to the inputs of the multi-input element AND, in addition, two elements AND and an element NOT are introduced, the output of which is connected to the third input of the key element .and to the first input of the first element And, the second input of which is connected to the second input of the trigger RA, the first input of which is connected to the output of the first AND element, the third input of which is connected to the second input of the key by the first input of the second AND element, the second input of which is connected to the output of the multi-input element AND and the input of the element NOT, and the output of the second element AND is connected to the second trigger input, and the outputs of the program storage unit are connected to the inputs of the counter.

In FIG. 1 shows a block diagram of the proposed device; in FIG. 2a, 3 are timing diagrams of its operation. .

A device for generating a series of pulses contains a pulse generator 1, a key element 2, a trigger 3, a counter 4, a program storage unit 5, a multi-input element And 6, two elements And 7, 8, an element NOT 9, an output of 10 keys ..... whose element is the output of the device. '’

The device operates as follows. We consider two cases

In FIG. 2a, time diagrams are shown for the case when the instant, start-up of the device is in time between the pulses of the pulse generator; in FIG. 2.6 - time diagrams for the case when the moment the device starts up coincides in time with the pulse coming from the pulse generator.

In the initial state, at the inputs of the multi-input element And b all 1, and at its output 11 as well. 1, at the main _ output 12 of the trigger 3 - 0, at its inverse output 13 - 1, the pulses from the pulse generator 1 do not pass through the key element, since at its outputs 12 and 14 - 0.

When starting up the device for forming a series of pulses, the information from the program storage unit is bitwise received • at the inputs of counter 4, and a number corresponding to the number of pulses in the series is written to it, meaning it reads at least one of the inputs of the multi-input element And b appears 0 7 which leads to the appearance of 0 '' '' _ at the output 11 of the multi-input element And 6 and 1 at the output 14 of the element NOT 9.

'This 1 permits the passage of the pulse from the generator 1 via bus 15 through the element And 7. The pulse coming from the pulse generator 1 is fed to the input of the installation 1 of trigger 3 and at the end of it switches trigger 3, i.e. at the output 12 appears 1, at the output 13 - О ”, 0” at the output 13 ”“ prohibits the further passage of pulses from the generator 1 to the input of trigger 3; 1 at the output 12 allows the receipt of the second and subsequent `` pulses '' from the generator 1 through the key “Zhoy” · ® Dement2. Each impulse, 'Passing through the key element 2 to the input of the counter' 4 is debited from it - I ^m . 65

By the end of the last pulse of the series at all the inputs of the multi-input element And 6 appear 1, and therefore 1 at its output. This 1 allows the passage of pulses on the bus 15 from the generator 1 through the element And 8 to the output '16, which leads to the reset of trigger 3.

The device returns to its original state, and a series of pulses are received at output 10. As can be seen from the timing diagram (Fig. 2, a), the pulses at the output of '10 appear only starting from the second pulse from the generator1 from the moment the device was started.

In case of coincidence in time of the pulse from the generator 1 and the start of the device (Fig. 2, b) 0 at the output 11 and, accordingly, 1 at the output 14, the passage of the present pulse from the generator 1 to the input of trigger 3 is allowed, and at the end of the pulse, the trigger capsizes, t. e. at the output 12 appears 1, at the output 13 - 0. Further, the operation of the device is similar to that described above. As can be seen from the timing diagram (Fig. 2.6), pulses at the output 10 appear ~ only starting from the second pulse from the generator 1 from the moment the device is started.

The use of two AND elements and an element DOES NOT preclude distortion of the first pulse of the series, which expands the scope of the device.

Claims (2)

1. USSR author's certificate  388358, cl. H 03 K 3/70, 07/05/71. 2. Authors certificate of the USSR. 456357, cl. H 03 K 3/78, 02.01.73.