Details to Assist in Implementation of Federal Standard 1016 CELP

Abstract

The DoD launched a program to develop a third-generation secure telephone unit (STU-III) capable of providing secure voice communications to all segments of the Federal Government and its contractors. They conducted a survey of 4,800 bit/s voice coders to select a standard for use in an upgrade of the STU-III to supplement its 2,400 bit/s LPC-10e vocoder. A code excited linear predictive (CELP) coder, jointly developed by the DoD and AT&T Bell Laboratories, was selected in this survey. Listening tests and Dynastat's diagnostic rhyme test (DRT) and diagnostic acceptability measure (DAM) show this revolutionary coder outperforming all U.S. Government standards operating at rates below 16,000 bit/s; it is even comparable to 32,000 bit/s continuously variable slope delta-modulation (CVSD) and is robust in acoustic noise, channel errors, and tandem coding conditions. Code Excited Linear Prediction.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1992
Accession Number
ADA256629

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Algorithms
  • Analyzers
  • Background Noise
  • Bandwidth
  • Coders
  • Coding
  • Communication Systems
  • Computational Complexity
  • Computer Programming
  • Decoding
  • Department Of Defense
  • Human Factors Engineering
  • Software Development
  • Spectrum Analysis
  • Speech Quality
  • Standards
  • Voice Communications

Readers

  • Defense Acquisition Program Management
  • Speech Processing/Speech Recognition.