Reception data expander having noise reduced in generation of re

Details Reception data expander having noise reduced in generation of re Reception data expander having noise reduced in generation of re

1997-09-05

1999-07-20

DeCady, Albert

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

714708, G06F 1100

Patent

active

059251468

ABSTRACT:
A reception data expander includes: an adaptive differential pulse code modulation (ADPCM) decoder activated when error detection information attains a reception data error nondetected state for expanding an input ADPCM code into a PCM (pulse code modulation) code, and inhibited of its decoding process operation when the error detection information indicates an error detected state; a memory circuit set to a write state when the error detection information attains an error nondetected state for sequentially storing generated ADPCM code, and outputting a stored PCM code when the error detection information is rendered to an error detected state; and a reconstructed output switch for selecting and providing to the next PCM decoder a PCM code when the error detection information attains an error nondetected state, and a PCM code read out from the memory circuit when the error detection information attains an error detected state. Noise generation arising from discontinuity of an ADPCM code at the time of reception data generation can be suppressed effectively without increasing the device complexity and power consumption.

REFERENCES:
patent: 4276649 (1981-06-01), Groenendaal et al.
patent: 5309443 (1994-05-01), Schorman
Nakamura et al., "Improved ADPCM Voice Transmission for TDMA-TDD Systems", 1993 43rd IEEE Vehicular Technology Conference, Secaucus, NJ, May 18-20 1993, pp. 301-304.

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