ADPCM decoder

Details ADPCM decoder ADPCM decoder

2007-11-13

2007-11-13

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Pulse code modulation

Differential

C375S217000

Reexamination Certificate

active

10807352

ABSTRACT:
A shift register receives a quantization difference signal separated into a mantissa part and an exponent part and bit-develops the mantissa part. A shift arithmetic operation control circuit bit-shifts the bit-developed mantissa part in accordance with a value of the exponent part. An overflow detection bit is added to the MSB of the shift register and detects the overflow of the bit-shifted mantissa part. When the overflow of the mantissa part is detected, a selector replaces the bit-developed mantissa part with a predetermined upper limit value and outputs it as a prediction signal. When the overflow is not detected, the selector outputs the bit-developed mantissa part as a prediction signal. An ADPCM decoder having high audio quality is provided by simple processes and construction.

REFERENCES:
patent: 5041830 (1991-08-01), Abe
patent: 5369791 (1994-11-01), Asghar et al.
patent: 5657350 (1997-08-01), Hofmann
patent: 4324900 (1992-11-01), None
patent: 07-221718 (1995-08-01), None
patent: 08-223126 (1996-08-01), None
patent: 10056388 (1998-02-01), None

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