Suppression of idle channel noise in delta modulation systems

Details Suppression of idle channel noise in delta modulation systems Suppression of idle channel noise in delta modulation systems

1977-12-27

1979-02-27

Claffy, Kathleen H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

179 1SA, 325 38B, 332 11D, H03K 1322, H04B 1500

Patent

active

041420667

ABSTRACT:
Disclosed is a method and apparatus for encoding speech with correct encoding of silence periods. In the disclosed apparatus, the speech signal is processed in contiguous blocks, and each block is tested, by evaluating a window of blocks in the neighborhood of the tested block, to determine whether the tested block represents a silence interval. When it is determined that a processed block represents silence, the processed block is forced to encode as a perfect silence. This forcing is accomplished by substituting the encoded block with a preselected silence sequence of alternating "1" and "0" strings.

REFERENCES:
patent: 3516022 (1970-06-01), Brolin
patent: 3855555 (1974-12-01), Burkhard et al.

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