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voice quality. Efficient algorithms for ADPCM have been developed and standardized. The CCITT standard G.7 21 ADPCM algorithm for 32 kbps speech coding is used in cordless telephone systems like CT2 and DECT. In a differential PCM scheme, the encoder quantizes a succession of adjacent sample differences, and the decoder recovers an approximation to the original speech signal by essentially integrating quantized adjacent sample differences. Since the quantization error variance for a given number of bits/sample R , is directly proportional to the input variance, the reduction obtained in the quantizer input variance leads directly to a reduction of reconstructionerror variance for a given value of R
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