SU919067A2 - Pseudorandom pulse train generator - Google Patents

Description

I

The invention relates to a pulse technique and can be used.

When constructing test equipment for discrete communication systems and computing.

According to the main author. St. No. 783960 is a pseudo-random pulse sequence generator, which contains a clock frequency generator connected to the synchronization input of the first shift register, directly and through an inverter with the synchronization input of the second shift register, and the register outputs are connected to the inputs of modulo two, whose output is coenHFieH with information inputs of both shift registers 1.

The shortage of the known device lies in the limitation of fupktsi (, 1 hour- (of the possible possibilities. It is formulated in the form of an incidental aftermath (1B.-1 T., period and structure

which is different from the M-sequence.

The purpose of the invention is the expansion of functional possibilities due to the formation of M-sequences (maxim sequences, alpine period) ..

This goal is achieved due to the fact that the pseudo-random sequence of pulses, the content of the clock frequency generator connected to the synchronization input of the first shift register directly, and the sync input of the second shift register

15 through an inverter, and a modulo two modulator, the output of which is connected to the information inputs of the first and second shift registers, the first and second registers are additionally entered

Claims (1)

20 shift, included above respectively between the output of the second main shift register and the first input of the modulo two adder and between the output 3 of the first basic shift register and the second input of the adder modulating the synchronization of the first and second additional shift registers respectively connected to the output of the clock pulses and to in the course of the inverter. The drawing shows a structural diagram of a generator of pseudo-random pulse sequences. The generator of pseudo-random pulse sequences contains a clock frequency generator, inverter 2, shift registers 3-6, adder 7 modulo two. The generator works as follows. If there is 1 clock frequency at the output of the clock pulse (unit), the output state of the adder 7 modulo two is recorded in the first register bit 3, and if there is a pause (one at the output of inverter 2), the output state of the adder 7 modulo two is recorded in register 4, which ensures the separation of the sequence of pulses at the output of adder 7 into a sequence of even and odd pulses having a frequency which is twice as low. When rewriting from the register. 3 shifts in the 6 shift register, the sequence of odd pulses receives an additional shift per clock pulse, and when re-registering from the shift register 4 into the shift register 5, the sequence of even pulses receives an additional shift for the duration of the pause between clock pulses. Thus, the sequence of pulses at the output of register 6 has a shift with respect to the sequence of odd pulses at the input of register 3, equal to (n + 2) T-ty), and the sequence at the output of register 5 with respect to the sequence of even pulses at the input of register 4 has an offset equal to (t + k) T- t, where n, t, k, P is the number of bits of the shift registers of 3.5, 4 and 6, respectively; T is the period of the clock frequency; t | - the duration of the clock pulse; the duration of the pause. When modulo two summations of pulses, at 74 the output of registers 5 and 6, at the output of adder 7, a pseudo-random sequence is formed with a pulse frequency twice as large as the generator frequency. To ensure the same duration of even and odd pulses in the output sequence, taken from the output of adder 7 modulo two, the duration of the clock pulse, neglecting the delay of the inverter, should be equal to half the clock frequency period. The period of the sequence is determined by the ratios (r1) and (rn k). The device provides the formation of M-sequences for irreducible trinomials of the form (N, N-I) .1 For even N: k p. m OR odd N: (n + EGNt + k); n, t, 1, k) 0. Thus, in the proposed generator, in contrast to the known one, the formation of the M-sequence with a period of 2 - 1 (with +) and the structure that has the greatest distribution in instrumentation equipment is ensured. Formula of the invention pseudorandom sequences of pulses according to the authors St. No. 783960, characterized in that, in order to expand its functionality, the first and second additional shift registers are included in it, connected respectively between the output of the second main shift register and the first modulo-two input and between the output of the first main shift register and the second the input of the modulo two, and the sync inputs of the first and second additional shift registers are connected respectively to the output of the clock generator and to the output of the inverter. Sources of information taken into account in the examination of I. USSR author's certificate No. 783960, cl. H 03 K 3/8, 1979. 2 R