A Variable Rate Voice Coder using LPC-10E

Abstract

This paper describes the current status of an ongoing research and development effort whose objective is a variable rate voice coder with a high degree of speech intelligibility and natural voice quality with an average throughput rate near 1200 b/s. The voice coder described here is based on the DoD FS 1015 LPC-10 2400 b/s vocoder. A method of silence detection and the use of variable size data frame formats to distinguish voiced and unvoiced frames are discussed. This voice coding technology is a critical component in supporting efficient integrated services over bandwidth constricted radio networks, satellite systems, and handheld portable communications devices.

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Document Details

Document Type
Technical Report
Publication Date
Jul 12, 1994
Accession Number
ADA464963

Entities

People

  • J. P. Macker
  • R. B> Adamson

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Bandwidth
  • Coders
  • Coding
  • Commercial Communications
  • Communication Networks
  • Communication Systems
  • Computer Programming
  • Human Factors Engineering
  • Military Research
  • Mobile Communications
  • Networks
  • Radio Communications
  • Speech
  • Standards
  • User Interface
  • Voice Communications

Fields of Study

  • Computer science

Readers

  • Computer Networking
  • Speech Processing/Speech Recognition.

Technology Areas

  • Space