SU907505A1 - Device for determination of standard pulse formation moment - Google Patents

Description

(54) DEVICE FOR DETERMINING THE MOMENT OF THE FORMATION OF A STANDARD PULSE

I

This invention relates to a measurement technique and may be used. in the development of spectrometric measuring time intervals.

A device for capturing the temporal positions of random signals, including discriminators of the upper and lower levels of signals, the delay element and the trigger 1.

The disadvantage of this device is its limited scope.

It is also known a device for determining the instant of formation of a standard pulse corresponding to a certain part of the front of the measured signal, containing discriminators of the lower and upper signal levels, whose inputs are connected to the input bus of the device, a sawtooth voltage generator with a variable amplitude rate of increase, and the first and second inputs which are connected respectively to the output of discriminators

the lower and upper levels of the signal, the level discriminator connected in series and the standard impulse generator, the input of the level discriminator connected to the output of the sawtooth generator with an adjustable amplitude slew rate G27 A disadvantage of the known device is the presence of false alarms when pulses enter the input, the amplitude spectrum which is enclosed between the thresholds for switching on the discriminators of the lower and upper levels of the signal.

The purpose of the invention is to improve the noise immunity.

This goal is achieved by the fact that a device for determining the moment of formation of a standard pulse, containing a lower discriminator and a discriminator of the upper signal level, whose outlets are connected to the input thickness of the device, and the outputs are connected to the inputs of the sawtooth voltage generator, and a series of equal scoring systems, a generator standard pulse and device bus output, delay element and trigger, single and zero entered. The input inputs of which are connected respectively to the output of the discriminator of the upper signal level and the output of the standard pulse generator, the first input of the level discriminator through the delay element connected to the output of the saw voltage generator, and the second input connected to the trigger output. FIG. Figure 1 shows a block diagram of a device for determining the moment of formation of a standard pulse; in fig. 2 - time diagrams of his work. A device for determining the moment of formation of a standard pulse contains discriminators 1 and 2 of the lower and upper signal levels, a sawtooth voltage generator 3, a delay element 4, a discriminator level 5, a generator of a standard pulse 6, trigger 7. The threshold levels of discriminators 1 and 2 are determined respectively maximum amplitude of noise signals and the lower limit of the amplitude range of the useful signal. The discriminator 5 levels in the initial state is blocked by the trigger 7. The device operates as follows. At the point in time when the amplitude of the useful signal reaches the lower threshold level, the signal 1FIG is generated on -Bixoae discriminator 1. 2 a, S), on the basis of which the generator 3 of the saw-tooth voltage is started with an adjustable rate of increase of amplitude (Fig. 2 b). On the front of an impulse formed by the discriminating upper level (Fig. 2b), the speed n of the sawtooth voltage is halved (Fig. 29), the trigger 7 is switched to the active state, and to the control input of the discriminator 5 uro n unlocking potential enters (Fig. 2Z). In this case, the sawtooth voltage through the delay element 4 is fed to the input of the discriminator 5 uro n (Fig. 26). The discriminator 5 registers the time when the amplitude of the linearly varying voltage reaches the response threshold. At the output of the generator 6 of a standard pulse, a signal of standard amplitude and duration is drawn (Fig.). Moreover, on the front of the latter, the trigger 7 returns to the initial state and blocks the level 5 discriminator. If the amplitude of the input signal is enclosed between the trigger thresholds of discriminator 1 and 2, then the information signal at the output of the device is not generated, since trigger 7 blocks the discriminator 5 level. The use of delay element 4 is due to the preservation of the accuracy of determining the instant of the formation of a standard pulse at the end of the dynamic range of the edges of the input signals. Its electrical length, -tj, is determined by the duration of the transients that occur when the level 5 discriminator is unlocked. Thus, the use of a delay line and a trigger allows one to exclude signals with a false determination of the moment of formation of a standard pulse, which makes it possible to increase the reliability of the output information in the proposed device. Invention About the device for determining the moment of formation of a standard pulse, containing a lower discriminator and a discriminator of the upper signal level, the inputs of which are connected to the input bus of the device, and are connected to the inputs of the sawtooth generator, as well as series-connected discriminator of the level, the generator the standard pulse and the output bus of the device, which differs from the fact that, in order to increase the noise immunity, a delay element and a trigger, a single and zero input, are introduced into it s which are respectively connected to the output of the discriminator upper layer signal and the output of a standard pulse generator, the first input of the discriminator level through a delay element connected to Exit the sawtooth generator and a second input coupled to an output latch. Sources of information taken into account during the examination 1. USSR author's certificate according to application N 2790224 / 18-21, cl. H 03 K 5/153, 1979. 2. Certificate of CCCF N 553587, cl. G O4 F 1O / 00, 1P7G ..

Claims (1)

Claim A device for determining the moment of formation of a standard pulse, comprising a discriminator of the lower and a discriminator of the upper signal levels, the inputs of which are connected * to the input bus of the device, and the outputs are connected to the inputs of the sawtooth generator, as well as series-connected discriminator level, the standard pulse generator and the output bus of the device , which differs from I in that, in order to increase the noise immunity, a delay element and a trigger are introduced into it, the unit and zero inputs of which are connected to yield responsible upper level discriminator output signal, and a standard pulse generator, the first input of the discriminator level through a delay element connected to the output of the sawtooth generator and a second input coupled to an output latch.