SU402852A1 - DEVICE OF ADJUSTABLE PULSE DELAY - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment and can be used, in particular, in digital autocorrelometric measuring instruments of low frequency.

A device for adjustable pulse delay is known, comprising a pulse shaper, a clock source, a switch, pulse counters with code transfer chains, and a control unit and a summing trigger.

A disadvantage of the known device is the relatively low accuracy and the limited range of values of the settable time shift of pulses.

In order to improve the accuracy of forming the time shift of pulses, a pulse counter and an electronic key are added to the proposed device, the inputs of which are connected respectively to the output of the clock source, one of the outputs of the summing trigger and one of the outputs of the additional counter, the second output of which is connected The input of the additional counter is connected to the output of the pulse former.

The drawing shows a functional block diagram of the proposed device.

The differentiating pulse former 1 and the clock source 2 are connected to the inputs of the switch 3. The outputs of the switch are connected to the inputs of the counters 4i and 42. The inputs of the summing trigger 5 are connected to the outputs of the counters 4i and 4h. All counters contain code transfer chains. The control unit 6 is connected, for example, to the counter 4i. Counters 42 and 4h are interconnected by transfer chains, and the input of counter 4z is connected to the output of the electronic key 7. The three inputs of this key are connected to a source of 2 clock oscillations, a summing trigger 5 and an additional counter 8, the input of which is also connected to the output of the differentiator pulse generator 1, and the output to the input of the summing trigger 5. (In a number of applications, the connection of the key 7 with the switch 3 is also useful). The proposed device works as follows.

In the initial state, the switch 3 does not pass the clock oscillations from the source 2 to the counter 4, 49 and 4h. From the control unit 6 to the counter 4i the number m is rechecked. The counters 42, 4з, 8 and trigger 5 are set to zero, the key 7 is closed.

After the arrival of the first signal pulse, differentiator shaper 1 produces phased needle pulses with front and rear fronts of the cnnala, respectively. The first needle impulse arriving at the switch 3, closes the circuit connecting the connected clock 2 clock oscillations with the counters 4i and 49. As a result, the capacity of the counters and the charge becomes full; clock fluctuations. Odiovremeino the first needle impulse (corresponding, for definiteness, and a positive signal differential) is fed to the punch 8 and writes “I. The second needle pulse arriving at the switch 3 stops the clock oscillation to the counter 42 and, through the peeples integrated into the counters, ensures that the code existing in the counter 42 is overwritten by the code 4z. The third and subsequent odd needle pulses from the driver 1 are fed to an additional counter 8, in which the number of signal impulses in the packet is recorded.

Lower the required shift time, i.e., pa the instant of overflow of the counter 4, it produces a pulse that flips the trigger 5 to the position “I. This produces a voltage pattern corresponding to the beginning of a packet of a time-shifted signal. Odiovremeino this re-enters the key 7. It is provided that the shift time / is longer than the Tp of the first impulse of the packet, the pulse from the output of summing trigger 5 opens the key 7, and the clock oscillations from the source 2 begin to read and the counter 42, has carried out the process of reading the previously recorded shggervala To work with a very small time shift (), you can add additional communication between switch 3 and key 7 (shown in dotted lines in the drawing).

In this case, the voltage drop from the trigger 5 ensures the activation of the key 7 only when it arrives from the switch 3, it resolves the potential appearing after the arrival of the second needle pulse. After each readout, the number corresponding to the pulse duration is recorded into the counter 4h from the counter 42 along the code transfer chains, and

The read cycle is repeated. (The transfer time of the code can easily be compensated by known methods).

The number of read pulses is determined by an additional counter 8, to which emulses occur when switching trigger 5 from position "O to position" I. These pulses sisyvayut previously recorded in it a number corresponding to the number of imevolsov filling in a pack. Upon completion of the write-off from counter 8 and key 7, an impulse is received that prohibits clock oscillation m from source 2 from passing through counter 4z. The same pulse resets the counters 42 and 4h to the zero state (the corresponding connection in the drawing is shown by a dotted line).

Thus, the proposed device eliminates the shift of the pulse signal with a duty cycle equal to two.

For the duty cycle, which is arbitrarily varied in the process of operation (but constant within the batch), the number of counters is doubled.

Subject invention

An adjustable pulse delay device containing a pulse shaper and a clock pulse source connected to the switch inputs, the outputs of which are connected to the pulse counter inputs with code chains, as well as a control unit connected, for example, to one counter, and a summing trigger connected to the outputs of the counters, characterized in that, in order to increase the accuracy of the formation of the time shift of the pulses, it is equipped with an additional pulse counter and an electronic key, the inputs of which are connected s respectively to a clock source output, one of the adder outputs a trigger and one of donolnitelnogo counter outputs, the second output of which is connected to a respective input of the summing trigger additional counter input connected to the output of the pulse shaper.