• DocumentCode
    3028925
  • Title

    A real-time floating point variable frame rate LPC vocoder

  • Author

    Cole, E. ; Boynton, Thomas L.

  • Author_Institution
    USC Information Sciences Institute, Marina del rey, CA
  • Volume
    2
  • fYear
    1977
  • fDate
    28246
  • Firstpage
    429
  • Lastpage
    432
  • Abstract
    As part of a Defense Advanced Research Projects Agency program investigating voice transmission over a packet-switched computer network, a real-time variable frame rate LPC vocoder has been implemented at USC-ISI. The vocoder is implemented on a Floating Point Systems AP-120B array processor. A likelihood ratio threshold is used to control when frames of data are transmitted. The average data rate and the speech quality of the vocoder depend on the threshold, but acceptable quality is possible with data rates less than 2,000 bits per second for continuous speech.
  • Keywords
    ARPANET; Autocorrelation; Bit rate; Computer networks; Filters; Linear predictive coding; Reflection; Speech analysis; Speech synthesis; Vocoders;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '77.
  • Type

    conf

  • DOI
    10.1109/ICASSP.1977.1170293
  • Filename
    1170293
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=3028925