SU1203536A1 - Walsh spectrum analyzer - Google Patents

Abstract

The invention relates to instrument engineering and can be used to calculate the discrete Walsh transform coefficients of unipolar telegraph signals. The purpose of the invention is to simplify the analyzer, which will increase the reliability of its work. The analyzer contains a clock pulse generator 2, a reversible counter 3 for recording the calculation results, an AND element 1 that generates signals corresponding to telegraphing, a Walsh function generator that generates signals for controlling the reverse of counter 3, and a register 5. 1 Il. (L with

Description

The invention is related to instrument making and can be used to calculate the discrete Walsh transform coefficients of uni-polar telegraph signals, for example, in solving problems of recognizing radio emission sources.

The purpose of the invention is to simplify the analyzer.

The drawing shows a schematic diagram of a spectrum analyzer based on Walsh functions.

The analyzer contains an element I1, a generator of 2 clock pulses, reversible counters 3, a generator of 4 Walsh functions and registers 5.

The analyzer works as follows.

The studied telegraph signal is fed to the input of the element I1, - to the other input of which a pulse sequence is fed from the generator output 2 clocks. The telegraph signal can take on only two values: a positive voltage corresponds to a telegraph parcel, a zero voltage corresponds to a pause between the parcels. At the output of the element And 1 act bundles of pulses, corresponding to the telegraph bridges. For accurate operation of the device, the pulse generation rate of generator 2 must be substantially higher than the transmission rate.

A Walsh function spectrum analyzer containing a clock pulse generator, the output of which is connected to the generator clock input.

The Walsh functions generated and the first input of the element I, the second input of which is the information input of the analyzer, the output of the completion of the Walsh function generator is connected to the 40 clock input i-ro (, N, N is the size of the conversion) of the register whose output is The output of the i-th harmonic of the analyzer, and the pulses of pulses arrive simultaneously at the counting input of each of the reversible counters 3. If a positive signal acts on the input of the reversal control, the counter 3 works on accumulation, i.e. counts the number of pulses arriving at the counting input. If a zero voltage acts on the reversal control input of this counter, or a voltage less than zero, then counter 3 works for a negative accumulation, i.e. subtracts the number of pulses arriving at its input. At the input of the pack, the reversal of each counter 3 enters the corresponding Walsh function, which takes the values S1. Therefore, during the generation of the complete system of Walsh functions, in each reversible counter 3, the number of pulses W is accumulated, proportional to

computed by the fact that, in order to simplify the analyzer, it contains N reversible counters, the output of the AND element is connected to the counting input of the i-ro reversible counter, whose information output. connected to the information input of the i-ro register, and the output of the i-th Walsh function of the Walsh function generator is connected to the clock input of the i-ro reversible counter, the zero input of which is connected to the output of the end of the Walsh function generator.

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equal to the corresponding component of the Walsh spectrum and

W,

where M is the number of pulses counted by counter 3 on the accumulation during the time of the positive values of the corresponding sequence:

M is the number of pulses counted by counter 3 per subtraction over the time of negative values of the corresponding Walsh sequence.

At the moment when the generation of the complete system of Walsh functions is completed, the generator of 4 Walsh functions produces a pulse at its exit, which goes to the zeroing inputs of all reversible counters 3 and clock inputs of registers 5. According to his command, the readings of each counter 3 are copied to the corresponding register 5, where the meters themselves are fixed 3, they are reset.

Claims (1)

Invention Formula A Walsh function spectrum analyzer containing a clock pulse generator, the output of which is connected to the generator clock input. Walsh functions and the first input element And, the second input of which is the information input of the analyzer, the output of the end operation of the generator of the Walsh functions is connected to the clock input i-ro (, N, N is the conversion size) of the register, the output of which is the output of the i-th harmonic analyzer, about tl and 50 3 computed by the fact that, in order to simplify the analyzer, it contains N reversible counters, the output of the AND element is connected to the counting input of the i-ro reversible counter, whose information output. connected to the information input of the i-ro register, and the output of the i-th Walsh function of the Walsh function generator is connected to the clock input of the i-ro reversible counter, the zero input of which is connected to the output of the end of the Walsh function generator. Ti2azh 7p S2SSS S2 Uzhgorod, Proektna str., 4 55