SU541176A1 - Autocorrelation binary process analyzer - Google Patents

Description

one

The invention relates to computing and is intended to investigate the autocorrelation function of short-term binary processes.

A known analyzer of autocorrelation functions contains a digital delay line implemented on shift registers. In this case, the autocorrelation function is obtained by multiplying the signals taken from different cells of the delay line. A set of multipliers and integrators are used to obtain the image of the autocorrelation function, with each channel responding to the effects of a single fixed delay 1.

The disadvantage of this analyzer is the bulkiness of the circuit and the impossibility of smoothly varying the delay in a wide range.

The closest technical solution to the present invention is an autocorrelation analyzer containing a digital controlled delay unit, whose input is connected to the analyzer input via the control unit, and the output is connected to the first input of the symbol correlometer and the control unit input, signal indicator the input of which is connected with the output of the correlative correlometer, and the input of the horizontal scanning with the output of the saw-tooth generator 2.

However, such an analyzer has limited accuracy.

The purpose of the invention is to increase accuracy. This is achieved by adding a switch to the proposed analyzer, an analog delay line, connected between the output of a digital controlled delay unit and the second input of the symbol-correlometer, a constant voltage source, and a clock generator, whose input through the switch is connected to the sawtooth generator outputs voltage and source of constant voltage, and output with control inputs of the digital controlled delay unit.

The drawing shows the proposed scheme

analyzer.

The analyzer contains a digital controllable delay unit 1, a control unit 2, a clock pulse generator 3, a constant voltage source 4, a sawtooth voltage generator 5, an electron-beam indicator 6, an analog delay line 7, a sign correlation meter 8, a switch 9. Analyzer works as follows.

Claims (2)

The investigated short-duration binary signal Go duration through the control unit 2 enters the block 1, the input of the clock pulse generator 3 is connected to the source of the constant voltage 4, and the frequency of the write clock pulses from the generator 3 is determined by the voltage at the output of the source 4. The number of cells of block 1 p is chosen from the condition of obtaining complete information about the signal and is determined by the ratio / g Gs / a; investigated where / in is the highest process. Thus, in the presence of a signal at the input, it is sequentially recorded in the cells of block 1, which plays the role of a memory block when recording. At the end of the process under study, the signal from the output of block 1 through the feedback circuit through the control unit 2 arrives at its input, at. This plays the recorded signal repeatedly. The switch 9 switches the output of the generator 25 5 to the input of the generator 3. At the same time, the signal of the generator 3 is modulated in frequency from the sawtooth voltage generator 5. Thus, at the output of unit 1, the oscillation rate of the cyclic process 30 is linearly changed. To remove the autocorrelation function, the first input of the symbol-matching correlometer 8 receives a signal from block 1 directly, and to the second input through an analogue delay line 7 with a fixed time shift. The response of the correlometer at any time of measurement corresponds to / (t) x (t) .x (t + (t + where x (t) is the implementation being investigated; ta is the time shift of the analog delay line; / s is the instantaneous frequency of the generator 3. 10 15 40 45 When linearly changing the frequency / s, the equivalent time shift between the inputs of the combi correlometer 8 linearly changes. A continuous change in the frequency / o provides a continuous image on the indicator. If necessary, a detailed study of individual areas of the correlation function follows accordingly. reduce the tuning limits of the generator 3. Image Formula An autocorrelation analyzer of binary processes containing a digital controllable delay unit, the input of which is connected to the analyzer input via the control unit, and the output to the first input of the symbol-correlometer and the control unit a ray indicator, the signal input of which is associated with the output of the symbol-based correlometer, and the horizontal scan input with the output of the saw-tooth generator, characterized in that In order to increase accuracy, a switch, an analog delay line, is connected between the output of the digital controlled delay unit and the second input of the symbol correlometer, a constant voltage source, and a clock generator, whose input is connected to the sawtooth generator outputs voltage and source of constant voltage, and the output with control inputs of the digital controlled delay unit. Sources of information taken into account in the examination: 1.Valitov R.A. et al. Correometers with electronic delay devices .- "Measuring equipment, 1971, No. 4. 2. Teterich NM. Generators of noise and measurement of noise characteristics. “Energie, 1968, p. 23 (prototype).