SU127698A1 - Dual-channel temporary discriminator - Google Patents

Description

Devices are known that produce a voltage, the magnitude and sign of which correspond to the shift of one sequence of pulses relative to another. The disadvantage of these devices is that they are designed to work with periodic sequences of pulses.

The difference between the proposed discriminator and the known ones is that there is no need to supply clock (setting) pulses to the circuit after each pair of analyzed pulses, which is achieved by automatically setting the circuit to its initial position after each operation. This property allows the device to be used for analyzing aperiodic, random signals coming in two channels.

The block diagram of the discriminator is given in FIG. I.

The device consists of two triggers q. 2, two valves 3 and 4, two delay lines 5 and 5 and is controlled by signals from the monitored A and reference B channels. Each trigger has two inputs: trigger / - inputs 7 and 5, trigger 2 - inputs 9 and 10. Channel A is connected to trigger / through input 7 and trigger 2 through delay line 5. Channel B is connected to trigger 2 via input 10 s trigger / through the delay line 6. Valves 3 and 4 are connected to the trigger of the opposite channels - 2 to J.

The operation of the device is as follows.

One of the channels, for example, channel A, is supplied with a setting pulse. This impulse enters input 9 of trigger 2 and at the same time, if valve 3 is open, input 7 of trigger 1. Impulse sets trigger 2 to position 1, which corresponds to open valve 3, while trigger / sets to position O, which corresponds to closed

No. 127698-2-valve 4. The next impulse, which comes along the same channel, is not at a steady-state level (see voltage diagram in Fig. 2). Thus, the following pulses only one channel A (or) does not cause switching triggers.

If, following the impulse of channel A, follows the impulse of channel B, then it will set the trigger / to position 7 and open valve 4, trigger 2 will not change its position, since valve 4 has been closed before. Repeated impulse along channel B will not change the state of trigger 1, but will knock over trigger 2, as a result of which valve 3 will close; subsequent pulses along this channel do not change the position of the system. When the impulses alternate in the channels, i.e. when the impulse of channel B is followed by the impulse of channel L, trigger 2 will move from one stable position to another. Indeed, the impulse of channel A will set trigger 2 to the position “/, and the impulse of channel B will return it to its original position. The trigger / will not switch, since valve 3 will be closed all the time before the arrival of the pulse of channel A, and the pulse of channel .6 will not affect the trigger, since it is already in the "/" position.

If the impulse of channel A bzdet ahead of impulse B, then the trigger 1 will switch. Thus, the trigger 1 at the output gives pulses, the duration of which corresponds to the advance, and the trigger 2 - the lagging of the pulses of channel A relative to the impulses of channel B. one channel, previously changing the sign of the pulses in one channel. Thus, the discriminator generates voltage pulses, the duration of which corresponds to the delay time of the pulses of one channel relative to the pulses of the other. With the advance of the pulses of one channel relative to the pulses of the other (reference), the resulting impulses are given out to one output, when it is delayed - to the other, and the value of the leading (delayed) is determined by the duration of the corresponding impulse.

Subject invention

A two-channel time discriminator consisting of a trigger, a valve and a delay line in each channel, characterized in that, in order to analyze aperiodic random signals, each of the channel inputs is connected to its trigger via a matching circuit and the opposite channel trigger via a delay line the second outputs of the coincidence circuits are connected to the triggers of the opposite channels.