SU1192152A1 - Signal distortion input device - Google Patents

Abstract

A DEVICE FOR INPUT OF DISTORTION OF A SIGNAL, containing serially connected clock generator and counter, first. Trigger, the first input of which is connected to the input of the driver of significant signal moments, and second trigger, whose output is connected to the first inputs of the main element AND and OR, the second inputs which are interconnected, characterized in that, in order to improve the accuracy of input of distortion, a third trigger and an additional AND element, the output of which is connected to one, are introduced in series from the inputs of the third trigger and to the Reset counter of the counter input, the first controlled switch, whose information inputs are connected to the first group of counter outputs, and the output connected to the second input of the first trigger, whose output is connected to the first input of the second trigger and to the second input of the element OR, the second controlled switch, the informational inputs of which are connected to the second (the left group of the counter outputs, and the output is connected to the second input of the second flip-flop, and the output of the signal generator is connected the second input of the additional element I.

Description

1 The invention relates to telecommunications and can be used to measure and control parameter channel and group equipment of digital communications equipment. The purpose of the invention is to increase the input of distortion. FIG. Figure 1 shows the structural electrical circuit of the device for inputting signal distortion, Fig. 2, timing diagrams explaining the operation of the device. The device for inputting signal distortions contains a generator of 1 clock pulses, a counter 2, a first control switch 3, an additional AND 4 element, a second controlled switch 5, a driver 6 significant signal moments, a main element AND 7, a SHSh 8 element, a third trigger 9 , the first trigger 10, the second trigger 11. The device operates as follows. Counter 2 with a constant counting coefficient, has t frequency outputs F and n frequency outputs, where m is the number of input signal transmission speeds, n is the number of values of insertion distortion, FJ is the doubled clock frequency () of the input signal (j 1, 2, ..., m), Р; - the frequency, half of the period of which is equal to the value of the introduced distortions (i 1,2, ... O. Before the beginning of the measurement, the codes to the first and second control inputs are sent to the first and second control inputs 3 and second 5 controlled switches. These codes define the frequencies F. and F, arriving at The outputs of the controlled switches 3 and 5. From the third control input to the first input of the third trigger 9, a signal is sent — logical 1. The same signal after the logical 22 1 is applied, the positive front of the input signal (FIG. 2a) is transformed by the driver of a short pulse ( Fig. 26), passes through AND 4 additional element and resets counter 2 with a constant counting factor to its initial state, thereby phasing it under the input signal. The first trigger 10 binds the input signal to the front of the 2f frequency, outputted from the output of the first controlled switch 3 (Fig. 2c), thus compensating for delays in the circuit and eliminating the effect of distortion contained in the input signal (Fig. 2e) . To introduce the corresponding distortion to the second input of the second trigger 11, a signal is output from the second controlled switch 5 (FIG. 2d). From the output of the second trigger 11, a sequence of input parcels arrives, which is time-dependent from the initial one (Fig. 2e). When overlaying the sequences shifted in time at the output of the main element And 7, a sequence is formed with shortened positive events (Fig. 2g), and at the output of the OR 8 element, a sequence with long positive events (Fig. 2i), the phase offset of the input signal Regarding the frequency of 2t due to frequency instability, it is not dangerous, since with their instabilities of the order of 10 j, which occurs in real digital transmission systems, the measurement time is much less than the time interval between two adjacent and procrastination. In addition, in the conditions of production control, the master oscillator of the signal source and the clock pulse generator of the proposed device are expedient to do in common.

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Claims (1)

DEVICE FOR INPUT OF SIGNAL DISTURBANCES, comprising serially connected clock generator and counter, the first trigger, the first input of which is connected to the input of the driver of significant moments of the signal, and the second trigger, the output of which is connected to the first inputs of the main element AND and the OR element, the second inputs which are interconnected, characterized in that, in order to improve the accuracy of distortion input, a third trigger and an additional element And, the output of which is connected to one of the ode of the third trigger and to the counter reset input, the first managed switch, the information inputs of which are connected to the first group of counter outputs, and the output is connected to the second input of the first trigger, the output of which is connected to the first input of the second trigger and to the second input of the OR element, the second managed switch the information q inputs of which are connected to the second group of outputs of the counter, and the output is connected to the second input of the second trigger, and the output of the generator of significant moments of the signal is connected to the second input of additional ADDITIONAL element I. SU. „, 1192152