SU1545248A1 - Vocoder - Google Patents

Abstract

The invention allows for the suppression of noise in speech pauses. A controlled attenuator 11, a block of 13 threshold elements responsive to the beginning of transmission pauses, and a block of software control 14, outputs connected to attenuator control inputs 11 are inserted into the vocoder receiving part. 1 il.

Description

one

(21) 4390756 / 24-10

(22) 03/11/88

(46) 02.23.90. Bul 7

(72) V.M. Zorin, I.M.Polkovsky,

A.K. Lidih, B.G. Bragenkov, V.V.Fadeev,

V.N. Maslennikov and A.P. Peterson

(53) 534.78 (088.8)

(56) Japanese patent application

 62-52879, class G 10 L 3/00, published

11/07/87.

Sapozhkov, MA, Mikhailov, V. G, Vokoderna connection. - M .: Radio and Communication, 1983, pp.79-81.

(54) VOCODER

(57) The invention makes it possible to suppress noise in the pauses of speech. A controlled attenuator II, a block of 13 threshold elements that react to the beginning of transmission pauses, and a block of software control 14, connected to the control inputs of the attenuator 1I, are inserted into the vocoder receiving part. The program provides for attenuation II attenuation changes consistent with hearing properties and speech statistics. I il.

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The invention relates to speech informatics and can be used in the technique of water-bucket communication.

The purpose of the invention is to attenuate 5 levels of received noise and electrical interference.

The drawing shows a block diagram of a vocoder.

The device contains Q input filter 1, band spectrum analyzer 2, tone / noise detector 3, pitch selector 4, compaction unit 5, separation unit 6, spectrum synthesis 7, tone / noise switch, pitch generator 9, noise generator 10, controlled attenuator I, output filter 12, block 13 of threshold elements and block 14 of program control .20

The input filter 1 through the spectrum band analyzer 2, the tone / noise detector 3, through the main tone extractor 4 is connected to the compaction unit 5, and the separation unit 6 is connected to 25 inputs of the synthesizer 7 of the spectrum, to the inputs of the tone / noise switch 8 and the main generator 9 current. The noise generator 10 through the tone-to-noise switch, the spectrum synthesizer 7, the attenuator-controlled nyuator 11 and the output filter 12 is connected to the output, and the inputs of the spectrum synthesizer through the block 13 of threshold elements and the program control block 14 are connected to the control inputs in -, - my attenuator. The inputted controlled attenuator 1I during speech transmission does not weaken the synthesized signals, since at this time i the elements of the block 13 40 triggering of the threshold elements take place. During the pause, the band analyzer 2 does not transmit through the compaction and separation of signals to the block 13 threshold elements Compiler V. Makhonin Editor L. Grathilo Tehred L. Oliynyk Proofreader M. Samborska

Order 493

Circulation 325

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

This leads to the launch of the control signal generation programs in the software control unit 14, and to the introduction of 10 dB of attenuation after a 100 ms pause and 20 dB of attenuation after another 50 ms.

When the pause ends, the transmitting part begins to send the sinal signals that are detected by the threshold elements and the program is interrupted, and the attenuation introduced by the attenuator is zeroed again. The specified duration and attenuation values are consistent with speech statistics and hearing properties, which improves quality and reliability voice transmissions described by vocoder

Claims (1)

The Vocoder comprising, on the transmitter side, an input filter connected to a compression unit through a band-pass spectrum analyzer, a tone / noise detector and a fundamental tone extractor, and on the receiving side a separation unit connected by outputs to the corresponding inputs of the spectrum synthesizer, switch tnr / noise and a pitch generator, a noise generator connected to the corresponding input of a tone-to-noise switch, and an output filter, characterized in that, in order to suppress noise in speech pauses, a threshold block is inserted into the vocoder lementov, program control unit and the controllable attenuator binding spectrum synthesizer output with an output filter, and inputs the spectrum synthesizer coupled to L yuschimi sound control inputs controlled attenuator connected in series via the block threshold elements and the control unit software. Subscription