Adpcm system for speech or like signals

Details Adpcm system for speech or like signals Adpcm system for speech or like signals

H - Electricity

04

B

179/2

H04B 1/64 (2006.01) H03M 3/04 (2006.01)

Patent

CA 1149289

ABSTRACT OF THE DISCLOSURE An improved adaptive predictive differential pulse code modula- tion (ADPCM) is disclosed. The transmitter of the system includes a sub- tractor for obtaining the difference between an input signal and a predicted value, and an adaptive quantizer for dividing the output of said subtractor by a normalization coefficient which adaptively varies and for supplying as the output the quotient of said division in coded form. The transmitter also includes an adaptive inverse quantizer for decoding the output of said adap- tive quantizer and for multiplying said decoded output by the normalization coefficient, and an adaptive predictor having a digital filter for providing said predicted value in response to the product of multiplication by the nor- malization coefficient by the adaptive inverse quantizer and for correcting the coefficient of said digital filter by the use of the output of the adap- tive quantizer or the result decoded by said inverse quantizer. The receiver of the system includes an adaptive inverse quantizer for decoding the output of said transmitter and for multiplying said decoded output by an adaptively varying normalization coefficient, in addition to an adaptive predictor hav- ing a digital filter for providing a predicted value in response to the pro- duct of multiplication by the normalization coefficient by said adaptive in- verse quantizer and for correcting the coefficient of said digital filter by the use of the output of the transmitter or the result decoded by said inverse quantizer. This invention provides a simplified ADPCM system capable of achieving greater frequency band compression.

353752

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