SU1571777A1 - Generator of imitated voice signal - Google Patents

Abstract

This invention relates to electrical and radio communications. The purpose of the invention is to increase the reliability of the imitation of the speech signal by simulating separately the statistical parameters of the current signal of male and female speech. The goal is achieved by forming a random signal with a normal distribution law and modulation or the frequency of one of the generators 6 and 7, each of which has its own average frequency corresponding to the average frequency of the current signal of male or female speech. The signal from generator outputs 6 or 7 is rectified by a half-wave rectifier 8 or 9 and fed to the output of the generator. The formation of a random signal is carried out by a pseudo-random sequence generator 1, a summation unit 3, a counting unit 5, and fed to the control inputs of generators 6 and 7 through a switch. The oscillator 1 is synchronized by a clock frequency generator 2 having two generation frequencies. 1 il.

Description

The invention relates to electrozadlink and can be used as a generator in devices for monitoring transmission systems and processing voice information, in particular echo cancellation devices.

The purpose of the invention is to increase the reliability of the simulation of a speech signal by modeling separately the individual statistical parameters of the tone signal of male and female speech ..

The drawing shows an electrical block diagram of a simulated speech signal generator.

The simulated speech generator includes a pseudo-random sequence generator 1, a clock generator 2, a summing unit 3, a counting unit 4, a switching unit 5, the first, second, generators 6, 7, the first and second one-half | periodical rectifiers 8, 9. ₍ -The device operates in the following way.

From the first output of the clock generator 2, the clock pulses (120 or 240 Hz) are fed to the sequence from the output of which, binary pseudorandom numbers parallel to the sixteen-bit form are fed to the first input of the summing unit 3, the clock pulses from the second output of the clock generator 2 are fed to the first input of a counting unit of 4 clock pulses up to sixteen, to obtain an intermediate result of bitwise summation of a binary 16-bit pseudo-random number from the previous Using a binary 16-bit pseudo-random number in block 3, the result is sent in the summation form to the second input of the counting block 4, where the recording is made and then the information is issued in parallel form from the first output of the counting block 4 to the second input of the summing block 3. The process of summing the input of the pseudo-random generator 1, at the same time, where the summation first occurs: intermediate bitwise summing in parallel 16-bits of the second output of block 3, the summation will be a binary 16-bit pseudo-random number having the normal distribution law, which goes to the input of block 5 Recording the result of summation from _ the first output of block 3 summation to the input of block 5 occurs only if there is a pulse that allows recording and coming from the second output counting about block 4 to the synchronizing input of block 5. Block 5 generates control signals that are supplied respectively to the inputs of the first or second generator 6, 7, which, depending on the incoming control signal, change the frequency of the generated signal.

The choice of the frequency deviation of the first and second generators 6, 7 is carried out in such a way that the total frequency deviation is equal to, respectively, the root-mean-square change in the frequency of the tone signal of male and female speech. The sinusoidal frequency signal from the output of the first or second generator 6 or 7 is fed to the input of the corresponding first or second half-wave rectifier 8, 9, in which the final formation of the tone signal of male or female speech occurs. Thus, the frequency distribution of the tone signal of male or female speech will obey normal law.

Claims (1)

Claim A simulated speech signal generator comprising a clock and a pseudo-random sequence generator, characterized in that, in order to increase the reliability of the speech signal simulation by separately modeling the statistical parameters of the male and female speech tone signals, a summing unit is connected in series, the first input of which is connected to the output of the pseudo-random sequence generator, the input of which is connected to the first output of the clock generator, the switching unit , the first generator and the first half-wave rectifier, the output in the summing unit 3 continues sixteen times cyclically until sixteen binary 16p-bit pseudorandom numbers are summed bitwise. The output of the device, 55 "is connected in series to a second generator, the input of which is connected to the second output of the switching unit, and a second half-wave rectifier, the output of which is connected to the output of the first half-wave rectifier, and a counting unit, the first and second inputs of which are connected respectively to the second outputs of the generator 1571777 _ clock frequency and block summarized. and the first and second outputs are connected respectively to the second input of the summing unit and the clock input of the switching unit.