Pulse or digital communications – Testing – Data rate
Patent
1997-02-26
1999-08-17
Pham, Chi H.
Pulse or digital communications
Testing
Data rate
375240, 375358, 375259, 455126, 455 69, 455 671, H04B 1700, H04B 346, H04Q 120
Patent
active
059404396
ABSTRACT:
A system is disclosed for an adaptive rate voice system to provide improvements in coded operation over changing communication channel (50) conditions. This adaptive rate system efficiently determines optimal voice/channel coding rates , coding strategies and modulation/demodulation for optimum voice quality and intelligibility. A system state estimator (100), channel status estimator (110) and channel status monitor (120) provides feedback in the system to optimize the communication channel. The system maintains a continuous link despite changing channel conditions and minimizes delays through the system. Even though simple in design, it provides relatively low complexity and powerful channel coding operation. Operating conditions are thus extended for CDMA and portable communication systems. Voice intelligibility is preserved in extremely noisy or even hostile channel conditions.
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Campbell William Michael
Kleider John Eric
Wood Clifford Allan
Bogacz Frank J.
Corrielus Jean B
Gorrie Gregory J.
Motorola Inc.
Pham Chi H.
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