SU613366A1 - Digital speech synthesizer - Google Patents

Description

I

The invention relates to the field of acoustics, in particular to speech synthesizers, and can be used in computer technology for outputting information from an electronic computer in speech form.

A device for speech synthesis is known, which contains an excitation source, at the output of which is the synthesis of voiced sounds, a sequence of short pulses appears, following the frequency of the main top, and in the synthesis of deaf sounds, a sequence of clippings of Schuma, a delay line (analog or digital) connected with the output of the exciter, multiplier, adder, as well as the source of control signals 1.

Their disadvantage is the low quality of the synthesized speech, since the accuracy of the synthesis is limited by the variation of the parameters of the used analog elements. Due to the predominant use of analog equipment elements in such devices, they do not have sufficient accuracy and adaptability.

It is also known a device for discrete speech synthesis, containing a pathogen with three inputs, a delay line, pulse shapers, multipliers, a low-pass filter, a control amplifier, an integrator.

Olk delay

control source 2.

The disadvantages of such a device are the limited accuracy of speech speech synthesis and low reliability, since despite the fact that the individual functional units of this device can be performed using the elements of discrete technology (i.e., digital) 1 and zaderi)

It is not possible to completely get rid of analog elements.

The aim of the invention is to increase reliability and the accuracy of speech spectrum synthesis.

This goal is achieved by the fact that a device containing a discrete exciter connected to the main shift register of a parallel code with taps and a digital multiplier, the second input of which

connected to a source of control signal codes, a push pulse generator, a switch of the outputs of the small shift register, whose inputs are connected to the outputs of the main shift register, an adder, an additional register of the parallel code shift, a switch of the full-frequency shift register and a digital-analog converter, and the outputs of the main switch the shift register is connected to the outputs of the adder, the output of which is connected to the first input of the digital multiplier, the output of the digital controller is connected to the input additional shift register of the parallel code, the outputs of which are connected to the switch inputs of the additional shift register, the output of the latter is connected to the input of the D / A converter, and the control inputs of the main shift register of the parallel code and the switch of the additional shift register are connected in parallel to the output of the push-pull generator.

The drawing shows a block diagram of a digital synthesizer.

The digital synthesizer contains a discrete exciter 1, controlled by pitch codes (OT) from the Tone-Noise (T-SH) signal; the main register 2 of the shift of the parallel code with taps, the input of which is connected to the output of the discrete exciter 1; switch 3 outputs of the main shift register, the inputs of which are connected to the outputs of the main register 2 shift; digital multiplier 4, the first input of which receives signals from the adder 5, and the inputs of the adder 5 are connected to the outputs of the switch 3 of the main shift register; additional register 6 shift parallel code, the input of which receives signals from the output of the digital multiplier 4; switch 7 of the outputs of the additional shift register connected but to the inputs with the outputs of the additional register 6 of the shift of the parallel code; a digital-to-analog converter 8, and the input of which signals the switch 7 of the additional shift register, the forward pulse generator 9 controlling the operation of the main shift register 2 of the parallel code and the switch 7 outputs of the additional shift register and the source of 10 codes of control signals connected to the second digital multiplier inputs 4.

Digital speech synthesizer works as follows. The pitch code and the Top Noise code control the operation of the discrete exciter 1, at the output of which codes are generated that correspond to the excitation signal.

The code combinations from the output of the discrete exciter 1 are fed to the input of the main register 2 of the shift of the parallel code and the iodine action of the pulses from the generator 9 of the advancing pulses is rotated across the entire discharge grid of the register 2.

Codes in register 2 of the shift between the two pushing pulses from the taps of the register 2, symmetric with respect to the central retraction, under the action of synchronization signals, switch the outputs of the register on the inputs of the adder 5 by the switch 3. Result

the sum is fed to the nerve input of the digital multiplier 4, where it is multiplied by the codes of the source 10 control signals, which are digital equivalents of the coefficients of the orthogonal decomposition of the speech spectrum.

The codes from the output of the digital multiplier 4 are recorded on the additional shift register 6 of the parallel code.

Thus, in the bits of the additional shift register of the parallel code during the time interval equal to the time base of the synthesis, the code combinations are digital equivalents of the samples of the time response of the orthogonal filter deployed in the space, which by switch 7 of the outputs of the additional shift register idle The emulsions from the generator output 9 of the propagating impulses are switched to the input of the digital-to-analog converter 8, at the input of which a synthesized signal appears signal

Claims (2)

1. At the secondary witness of the USSR A 372720, cl. H 04 R 3/18, 1973. 2. Authors' certificate of the USSR. № 388369, cl. H 04 R 3/18, 1973.