Pulse or digital communications – Pulse code modulation – Differential
Patent
1995-05-25
1998-08-25
Chin, Stephen
Pulse or digital communications
Pulse code modulation
Differential
371 35, 371 377, H04B 1406
Patent
active
057990395
ABSTRACT:
A method and apparatus for mitigating error in a received communications signal includes an error mitigator (35) of a communication unit (12) which receives and performs mitigation based on an error indication. In a first embodiment the error indication is a phase or non-used data symbol indicating error in ADPCM data, and mitigation includes changing certain nibble values to different predetermined values. In a second embodiment the error indication may include other parameters, e.g., a CRC frame error indicator, and an error estimator (34) determines a level of corruption in the ADPCM data. The error mitigator (35) applies a predetermined set of replacement values based on the indicated level of corruption and the mitigated data is subsequently decoded in an ADPCM decoder (26).
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Laird Kevin Michael
Marko Paul D.
Smith Sybren D.
Wadin Craig P.
Chin Stephen
Ghayour Mohammad
Motorola Inc.
Terry Bruce
LandOfFree
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