SU828382A1 - Pulse train generator - Google Patents

Description

one

The invention relates to a pulse technique and can be used in a facsimile technique, in particular, for transmitting and receiving weather meteorological maps, for example, in encoding images.

A device for forming a series of pulses is known, comprising a paraphase generator, pulse counters, And elements, and a trigger (1.

A disadvantage of this device is the inability to maintain a constant period of follow-up of the output pulse series with a different number of pulses in the series, as well as a slow response time.

The closest in technical essence to the invention is a device for forming a series of pulses, comprising a para-phase signal generator, the first output of which is connected to one of the inputs of the And element, the other input of which is connected to the second output of the paraphase signal through the first pulse counter and to the input of the second counter pulses 2. In addition, the device contains the element NO and a program storage unit, the outputs of which are bit-wise connected to the corresponding bits of the second pulse counter, the output to expensively connected to the first input of the element NO, and its output is connected to the second input

a trigger, the first input of which is connected to the discharge discharge of the second pulse counter, the second input of the element NO, and to the input of the program storage unit.

The disadvantage of this device is the low speed due to the use of a paraphase signal generator (pulse frequency in the series is 2 times lower), and the impossibility of obtaining a continuous series of pulses without pauses between the series, which is necessary when encoding images, or a pause not longer than one oscillator frequency periods due to the use of two

pulse counter. The repetition period of a series of pulses is obtained due to the difference in the number of pulses counted in the counters, therefore the pause between the series depends on the capacity of the pulse counter.

The aim of the invention is to increase the speed of the device.

This is achieved by the fact that the device for forming a series of pulses contains a pulse generator, the output of which is connected to the first input of the element I, a program storage unit consisting of a series-connected shift register, a block of pulse shapers and an encoder whose output is connected to the bit

the pulse counter inputs, the OR element and the AND element, the output of which is connected to the second input of the AND element, whose output is connected to the input of the pulse counter, are added to it, the output of the pulse counter is connected through the OR element to the control input of the pulse driver unit, and the output outputs the pulse counter is connected to the inputs of the additional element I.

The drawing shows a block diagram of a device for forming a series of pulses.

A device for forming a series of pulses contains a generator of pulses 1, elements 2 and 3, a counter of 4 pulses, an element OR 5, a program storage block 6 which contains a shift register 7, a block 8 of pulse formers, an encoder 9.

The drawing also shows an input bus 10, a start bus 11, a device output bus 12.

The device works in the following way.

In the initial state, the counter of 4 pulses is filled, the element And 2 is closed because from the output of the element And 3 enters "O. With the arrival on bus 10 of information about the required number of pulses in a series on the shift register 7 of the program storage unit 6, the number code is recorded through the corresponding pulse generator and encoder 9 into the 4 pulse counters. The state of the counter 4 pulses changes and at the output of the element I 3 appears "1, the element And 2 opens, allowing thereby the passage of the pulses from the output of the generator 1 pulses through the element And 2 to the bus 12 of the device. At the same time, the pulses from the bus 12 arrive at the counting input of the pulse counter 4, which is filled and the element 2 closes through the element 3. The number of pulses in the series corresponds to the number code recorded in the counter 4 pulses. At the same time, an overflow pulse appears from the output of the 4-pulse counter, which allows the block of drivers 8 to write, using the encoder 9, the next code of the number of pulses in a series into the counter of 4 pulses.

Device operation continues. Information about the code of the number of pulses in the next series is fed through bus 10 to block 6 for storing the program to shift register 7.

If it is necessary to obtain a series of pulses with long pauses, the recording of the number of code in the counter of 4 pulses is dried;

element OR 5.

Claims (2)

1. USSR author's certificate number 627570, cl. H OZK 3/64, 1976. 2. USSR author's certificate number 632063, cl. H OZK 3/04, 1976.