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More About Vector Adaptive/Predictive Coding Of SpeechReport presents additional information about digital speech-encoding and -decoding system described in "Vector Adaptive/Predictive Encoding of Speech" (NPO-17230). Summarizes development of vector adaptive/predictive coding (VAPC) system and describes basic functions of algorithm. Describes refinements introduced enabling receiver to cope with errors. VAPC algorithm implemented in integrated-circuit coding/decoding processors (codecs). VAPC and other codecs tested under variety of operating conditions. Tests designed to reveal effects of various background quiet and noisy environments and of poor telephone equipment. VAPC found competitive with and, in some respects, superior to other 4.8-kb/s codecs and other codecs of similar complexity.
Document ID
19920000676
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Jedrey, Thomas C.
(Caltech)
Gersho, Allen
(Voicecraft, Inc.)
Date Acquired
August 15, 2013
Publication Date
November 1, 1992
Publication Information
Publication: NASA Tech Briefs
Volume: 16
Issue: 11
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-18297
Accession Number
92B10676
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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