METHOD FOR NOISELESS CODING OF SPEECH SIGNALS IN DIGITAL RADIO COMMUNICATION SYSTEM Russian patent published in 2016 - IPC H03M13/15 H03M13/23 

FIELD: radio engineering, communication.

SUBSTANCE: method for noiseless conversion of speech signals in a digital radio communication system through modification thereof into a digital form via delta modulation is characterised by determining the digital value e_i of the next i-th speech reading using the difference between the input signal reading x_i and the approximation of said reading y_i, expressed by a given relationship, and subsequent redundant coding of the digital information with noise-immune cyclic or convolution code, wherein to improve noise-immunity of the digital signal, a convolution code sequence is used, pairs of readings x_i,1 and x_i,2 are coded simultaneously, which enables to maintain communication link data rate, which is equal to the analogue-to-digital conversion rate of the speech signal.

EFFECT: preventing increase of the data rate of a digital radio link.

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