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  • 1
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    More About Vector Adaptive/Predictive Coding Of Speech (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report 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.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18297 , NASA Tech Briefs (ISSN 0145-319X); 16; 11; P. 68
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Vector Adaptive/Predictive Encoding Of Speech (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Vector adaptive/predictive technique for digital encoding of speech signals yields decoded speech of very good quality after transmission at coding rate of 9.6 kb/s and of reasonably good quality at 4.8 kb/s. Requires 3 to 4 million multiplications and additions per second. Combines advantages of adaptive/predictive coding, and code-excited linear prediction, yielding speech of high quality but requires 600 million multiplications and additions per second at encoding rate of 4.8 kb/s. Vector adaptive/predictive coding technique bridges gaps in performance and complexity between adaptive/predictive coding and code-excited linear prediction.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17230 , NASA Tech Briefs (ISSN 0145-319X); 13; 9; P. 40
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Pulse Vector-Excitation Speech Encoder (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Proposed pulse vector-excitation speech encoder (PVXC) encodes analog speech signals into digital representation for transmission or storage at rates below 5 kilobits per second. Produces high quality of reconstructed speech, but with less computation than required by comparable speech-encoding systems. Has some characteristics of multipulse linear predictive coding (MPLPC) and of code-excited linear prediction (CELP). System uses mathematical model of vocal tract in conjunction with set of excitation vectors and perceptually-based error criterion to synthesize natural-sounding speech.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17131 , NASA Tech Briefs (ISSN 0145-319X); 13; 11; P. 34
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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