SU951687A1 - Device for selecting signal pulses from noise and pulse interference - Google Patents

Description

one

The invention relates to a pulse technique and can be used in communication devices and telemetry.

A device for extracting pulsed signals is known, comprising an amplifier, serially connected delay elements, an inverter and an adder, serially connected, a threshold unit and a pulse shaper, serially connected control unit and a multiphase multivibrator, as well as a limiter, element, integrator, amplifier output connected to the input of the limiter, j the output of which is connected to the first input of the element I, the VTHER inputs of which are connected to the corresponding outputs of the multi-phase multivibrator, and the out One element And through the integrator 20 is connected to the input of the delay element and the second input of the adder, the output of which is connected to the input of the threshold block L 1.

The disadvantage of this device is its limited functionality, since it produces the selection of pulses of a known duration, which is determined by the duration of the pulses of the multi-phase puller and the time constant of the delay element.

Claims (1)

The closest in technical essence to the proposed device is a pulse selection device comprising a series-connected pulse generator, the first element I, a counter, a prohibition element, a block of the falling edge of the pulse, a delay line with taps and a second element I, and the input bus is connected to the second ... input of the first element I and with the second input of the inhibit element, the output of the block of the formation of the back of the pulse is connected to the counter-inlet of the counter, the output bus is connected to the output of the second elec ment and G2.1. The disadvantages of the known device are its limited functionality, since it produces the selection of pulses, the duration of which is known in advance and is determined by the period of the pulses coming from the generator, and the counting coefficient of the counter, as well as its low selection, to the input of the device at the time of arrival of the signal pulse, may lead to loss of information. The purpose of the invention is to expand the functionality of the device, consisting in the ability to divide single pulses of arbitrary duration and decrease, likelihood of an information panel. This goal is achieved by the fact that in the device containing the input and output buses, the pulse generator, the prohibition element, the counter, the AND element, two threshold devices are introduced, the second counter, the code comparison bhück and the trigger bus are connected to the trigger output, to the information input of which the input bus is connected through a prohibition element, and through the element I - the output of the comparison unit, the kodo inputs of which are connected to the outputs of the meters connected by the inputs to the outputs of the corresponding threshold devices, the output of the generator. If it is connected to the counter inputs of the counters and the trigger input of the trigger, the input bus is connected to the inputs of the horn devices, the output of the second counter is connected to the second inputs of the inhibit element and the element And, In the proposed device, when there is interference, the number of interference pulses is compared with different amplitude, received at the input of the device for a certain period of time, which allows to select the signal pulses of arbitrary duration, as well as: reduce the probability of loss of information. Figure 1 shows the electrical block diagram of the device; figure 2 - timing diagram of the device. The device contains an input bus 1 connected to the inputs of the threshold 9 devices 2 and 3, the outputs of which are connected to the inputs of counters and 5, respectively, the comparison block codes 6, the inputs of which are connected to the outputs of the counters, and the output through the element 7 to the trigger input 8 , to the input of which, through the element of prohibition 9, the input bus is connected, and to output 7, the output bus 10; pulse generator 11, the output of which is connected to the contacting trigger input and to the counter inputs. Asymmetric triggers with automatic bias collected on semiconductor triodes are used as threshold devices. All other nodes are built on integrated circuits of transistor-transistor logic. The device works as follows. Interference pulses simultaneously arrive at the threshold devices 2 and 3. The reference voltage of the threshold device 2 is chosen close to the expected amplitude value of the signal pulse, and the reference voltage of the threshold device 3 is close to zero. In the absence of a pulse signal on the input bus 1 at the output of the threshold device 3, the pulse frequency is higher than at the output of the threshold device 2 (fmg.2, b, c.). For a certain time interval, the code at the output of the counter is smaller than at the output of counter 5 When a signal pulse arrives with superimposed noise pulses, the code at the output of counter 5 is smaller than at the output of counter k. Depending on the result of the comparison of the codes received from the outputs of the counters t and 5, the output of the comparison block of codes 6 is the value of a logical zero or a logical unit that, through the element I, goes to the information input of the trigger 8. The time interval for which KOTO. interference pulses, determined by the period of the pulses emitted by the pulsed generator 11 (FIG. 2, d). These pulses trigger the closure and reset the counters k and the value of the logical zero or logical unit that goes to the information onny trigger input is recorded in the trigger 2 b, d). In the absence of interference at the input of the device, the logic zero level from the output of counter 5 goes to the second inputs of prohibition element 9 and element 7, thereby connecting input bus 1 to the information input of trigger 8. The proposed device provides enhanced functionality consisting of selection of single pulses of arbitrary duration and improvement of their selection, which is produced as a result of comparing the number of interference pulses of various amplitudes received at the device input during ie a certain period of time. The invention The device for selecting signal impulses from noise and impulse plots containing input and output busses, a pulse generator, a counter, an interdiction element, an element I, which implies that, 7 " the purpose of extending the functionality by ensuring the allocation of single im-, pulse of arbitrary duration and reducing the likelihood of information loss, two threshold devices, a second counter, a code comparison block and a trigger, with the output bus connected to the trigger output, are entered into at the input of which, through the prohibition element, the input bus is connected, and through element I, the output of the code comparison unit, whose inputs are connected to the outputs of the counters connected by the inputs to the outputs of the corresponding threshold devices, the output of the pulse generator is connected to the outgoing inputs of the counters and the clock input of the trigger, the input the bus is connected to the inputs of the threshold devices, the output of the second counter is connected to the second inputs of the prohibition element and element I. Sources of information taken into account during the examination 1. Author's witness Union of USSR № 720823, cl. H 0 Q 1/36 31.07.78.2. Author's certificate of the USSR 560366, cl. H About Q 3/0, 09/01/75 (prototype). noon g ui.2