SU553587A1 - The method of determining the moment of formation of a standard pulse and device for its implementation - Google Patents

Description

FIG. 1 shows a diagram of the device; in fig. 2 - 6 - graphics, graphics devices to work.

The device consists of a discriminator 1 and 2 signal levels, a sawtooth voltage generator 3, an adjustable slew rate, a discriminator 4 sawtooth voltage levels, and a generator of 5 standard pulses. To protect the device from large signals, an input limiter can be supplied.

The device works as follows. At the input 6 of the device, the pulses shown in FIG. 2. The threshold level of the discriminator 1 is set above the noise level. At the instants when the pulse reaches the threshold level, the output 7 of the discriminator 1 shows the signal shown in FIG. 3. When this signal occurs, a sawtooth generator is started up with an adjustable slew rate, which generates the sawtooth voltage shown in FIG. 5. The threshold level of discriminator 2 is higher than the threshold level of discriminator 1, for example, twice. The signal at the output 8 of the discriminator 2 is shown in FIG. four.

With the appearance of this signal, the growth rate of the sawtooth voltage is halved (Fig. 5). The sawtooth voltage discriminator records the times when the sawtooth voltage reaches the pickup threshold. It is obvious that these moments of time are separated from the beginning of the pulse by a constant value, independent of the pulse amplitude and the steepness of the front, i.e. the discriminator 4 registers with the constant delay the beginning of each pulse (of course, with an accuracy of linear approximation of the front ).

The discriminator 4 controls the operation of the standard pulse generator. The time interval between the output signals (Fig. 6) of the generator 5 is equal to the time interval between the input pulses.

By turning on a standard time interval meter at the device output, it is possible to measure the time interval between incoming pulses.

Claims (2)

1. A method for determining the instant of formation of a standard pulse corresponding to a certain part of the front of the measured pulse, consisting in the formation of a linearly varying voltage, the formation and rate of increase of which change at certain points in time, and the standard impulse is formed at the time of achieving equality between linearly varying and predetermined voltages, characterized in that, in order to increase the noise immunity, the linearly varying voltage the margins are determined by the front of the measured pulse of two levels of discrimination, with the beginning of the lower level and the moment of the change in the steepness of the generated linearly varying voltage at the upper level. 2. An apparatus for carrying out the method according to Claim 1, containing a level discriminator connected in series and a standard pulse generator, characterized in that two signal level discriminators and a sawtooth voltage generator are introduced into it with an adjustable amplification rate, the signal level discriminator inputs are combined and serve as the device input, and the outputs are combined with the sawtooth generator generator with an adjustable amplitude rate, the output of which is connected to the level discriminator input.