Implementation of a Robust 2400 b/s LPC Algorithm for Operation in Noisy Environments

Abstract

A detailed description of the implementation of a robust 2400 b/s LPC algorithm is presented. The algorithm was developed to improve vocoder performance in acoustically compromised environments. Improved robustness in noise is achieved by: (1) increasing the speech bandwidth to 5 kHz; (2) increasing the LPC model order to 12; and (3) doubling the analysis rate. Frame fill techniques are used to achieve the 2400 b/s data rate. The algorithm is embodied in the Advanced Linear Predictive Coding Microprocessor which was developed as a prototype voice processor for in-flight evaluation of narrowband voice communication in the JTIDS communication system. Keywords: Robust vocoding; Frame fill; Linear predictive coding; Speech compression.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1987
Accession Number
ADA180644

Entities

People

  • Elliot Singer
  • Joseph Tierney

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Algorithms
  • Bandwidth
  • Calorific Value
  • Coding
  • Coefficients
  • Communication Systems
  • Data Rate
  • Data Transmission
  • Decoding
  • Environment
  • Massachusetts
  • Models
  • Numbers
  • Reflection
  • Voice Communications

Fields of Study

  • Engineering

Readers

  • Radio communications and signal processing.
  • Speech Processing/Speech Recognition.