Speech Algorithm Optimization at 16 KBPS.

Abstract

This report describes the design of a 16 Kb/s Split-Band Adaptive Predictive Coder (SBAPC) whose high quality processed speech compares favorably with that of the Continuously Variable Slope Deltamodulator (CVSD) in both back-to-back and simulated tactical situations. Operations of this algorithm include the partitioning of the input frequency band evenly into two subbands and the encoding of the subband waveform using Adaptive Predictive Coding (APC). The results of our investigation on quadrature mirror filters, tradeoffs between various APC parameters, noise shaping techniques, and adaptive bit allocations are presented. This report also gives a detailed discussion on the utilization of noise suppression techniques in reducing stationary background noise and forward error-correcting codes in maintaining the SBAPC performance at 10 to the minus 2 channel error rate. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 30, 1980
Accession Number
ADA092010

Entities

People

  • A. J. Goldberg
  • R. S. Cheung
  • S. Y. Kwon

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bandwidth
  • Coding
  • Communication Channels
  • Computer Programming
  • Computers
  • Detection
  • Energy Bands
  • Filtration
  • Frequency Bands
  • Frequency Domain
  • Generators
  • Mathematical Filters
  • Metal Matrix Composites
  • Plastic Explosives
  • Probability Density Functions
  • Signal Processing
  • Statistics

Fields of Study

  • Engineering

Readers

  • Operations Research
  • Phased Array Antenna Design.
  • Speech Processing/Speech Recognition.