SU907790A1 - Pulse shaper - Google Patents

Description

(54) FORMY, OWNER OF PULSES

one

The invention relates to a pulse technique and can be used in automatic telephone exchanges and in particular in quasi-electronic stations as a pulse corrector, as well as in various automation devices.

A pulse corrector is known that is implemented on two correction channels, each of which contains a trigger and a matching circuit for a common output trigger. The correction is performed using two series of clock pulses, the first of which is fed to the outputs of the flip-flops, and the second to the inputs of the matching circuits of each of the channels. The output signal is taken from the common TpHrrepaflj.

. The disadvantage of this ipulse correction is the instability of pulse correction due to the use of two series of clock pulses. Having two series of clock pulses greatly complicates the device.

The closest in technical essence to the invention is a 2 J pulse shaper, containing two AND elements and an output trigger, to the input of which the IS element is connected.

The disadvantage of this driver is the reduced noise immunity due to the impossibility of adjusting the correction without changing the period of the clock pulses.

The purpose of the invention is to improve the accuracy of the correction mode.

Claims (1)

The delivered circuit is achieved by having a pulse driver containing two. An I input, the first inputs of which are connected to the input bus, and the outputs through the OR element are connected to the clock input of the output trigger, a shift register is entered, the outputs of which are connected dooTBeTCTBeHHO to the 3 remaining inputs of the I elements, and the information input is connected to the input bus and information input output trigger. The drawing shows a functional diagram of the pulse former. The pulse shaper contains, as a correction element, a shift register 1, elements AND 2 and 3 with inverse inputs and output trigger 4. The outputs of elements AND 2 and 3 are connected through OR 9 to the enable input 6 of trigger 4. Elements 2 and 3 and OR 5 form a reference element providing a signal that permits the recording of information and a trigger 4 when identical signals appear at inputs 7, 8 and 9 of element AND 2 or inputs 10, 11 and 12 of element 3. And element 2 registers the appearance at all inputs 7, 8 and 9 logical 1, and the element And 3 - logical x I O shift register is a four trigger providing serial transfer Postup kitsey informa1schi admission of clock pulses at their counting inputs. The corrector input is connected simultaneously to the information input of shift register i and information input 14 of trigger 4, as well as to one of inputs 9 and 10, respectively, And 2 and 3 elements, the other inputs of which are 7, 8 and If, 12 are connected respectively to outputs 15 and) 6 of the shift register I. The outputs 17 and 18 of the shift register 1 are not active and can be used (if it is necessary to obtain a greater correction accuracy for changing the delay time. The input 19 of the shift register 1 is supplied with clock pulses. Output 20 of the output trigger 4 is the output of "Nro in The pulse driver operates as follows: Usually, the input signal has gaps caused by the appearance of short-term || interference due to vibration of contacts and pickups in the line, {information about the state of the line (in the form of logical 1 or logical ) arrives at input 13 of shift register 1 n successively moving clock pulses on it at input 19. When signals at inputs 7, 8 and 9 or 10, 11 and 12 of one of the elements AND 2 or 3 coincide, the front is changed from logical O the logical 1 resolution signal goes to the input one 6 output trigger 4, permission to receive an information entry at the input of the information corrector to the specified trigger 4. At the same time, at the output of the information recording trigger 4, the information available on the input bus appears. It is obvious that the signal at the output is Vits with a time lag depending on the time of the occurrence of interference, i.e. short-term change of signals at the input of the corrector when changing information (changing the signal from logical O to logical 1 and vice versa). Separate interference, both during the shift and after the signal was established at the input, only leads to confirmation of the correctness of the incoming signal, since the resolution to record and formatting appears with a delay and only when the signals coincide on one of the And 2 or 3 elements. The shaper allows reducing the input signal delay time by switching two inputs of the AND 3 or 2 elements to the other outputs of the shift register 1. The use of this shaper in quasi-electronic telephone exchanges allows using it without changing the and work zadshoschego generator with devices for long imeyuoschmi five different maximum time of random noise. The invention The pulse shaper containing two elements And the first inputs of which are connected to the input bus, and the output through the SHSh element are connected to the output trigger input trigger, characterized in that in order to improve the accuracy of the correction mode, a shift register and outputs are entered into it which are connected respectively to the remaining inputs of the elements And, and the information input is connected to 59077904 the input bus and informational. USSR author's certificate of the entrance of the output trigger. 269990, class H 03 K 5/153, 1967. Sources of information, 2, USSR Copyright Certificate taken into account during the examination - 632075, cl. Hc K 5/20, 1977. 1LG