Adaptive differential pulse code modulation system with transmis

Details Adaptive differential pulse code modulation system with transmis Adaptive differential pulse code modulation system with transmis

1994-05-24

1996-08-27

Nguyen, Hoa T.

Excavating

371 51, G06F 1100

Patent

active

055508375

ABSTRACT:
A codeword forcing technique is applied which provides gradual degradation of an audio output during fading such that analog degradation in a fading signal environment is simulated. The system may be used in conjunction with digital cordless telephones where gradual degradation of a 32 Kbit/s ADPCM signal is obtained by indirectly detecting a transmission bit error rate, The bit error rate detection is accomplished by sensing the occurrence of an invalid all-zero code, Codeword forcing techniques are then applied to compensate for the inaccurate transmission and associated noise level,

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