Adpcm system for speech or like signals

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

H - Electricity

03

M

354/69

H03M 3/04 (2006.01)

Patent

CA 1148661

Abstract of the Disclosure An adaptive differential pulse code modulation system is described in which the problems of instability and deterioration of signal to noise ratio are mitigated. The transmitter of the system includes a subtractor for obtaining the difference between an input signal and a predicted value, a quantizer for quantizing the output signal given from said subtractor, and a decoder which stores the output signal given from said quantizer, multiplies at least one past signal of those output signals given from said quantizer by at least one coefficient, calculates the sum of the products as results of the multiplications, adaptively corrects the coefficient so as to lessen the output signal given from the quantizer, and produces the sum of the products as a predicted value or a part of the predicted value. The receiver of the system includes a decoder which receives and stores the output signal given from the quantizer in the transmitter, multiplies at least one past output signal given from the quantizer by at least one coefficient, calculates the sum of the results of the multiplications, adaptively corrects the coeffici- ent so as to lessen the output signal given from the quantizer, and produces the sum of the multiplication results as a predicted value or part of the predicted value, and an adder for calculating the sum of the predicted value and the output signal given from the quantizer and producing it as a repro- duction signal.

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