Selected Methods for Improving Synthesis Speech Quality Using Linear Predictive Coding: System Description, Coefficient Smoothing and STREAK

Abstract

This report develops two generalizations of the standard Linear Predictive Coding (LPC) implementation of a narrow band speech compression system. The purpose of each method is to improve the speech quality that is available from a standard LPC system. Attention is focused primarily upon the pitch excited system and therefore, the improvements considered focus upon the improved estimation of the reflection coefficients and the pitch period. Specifically, a parameter filtering algorithm is developed for dynamically smoothing the reflection coefficients to both increase naturalness in synthetic speech as well as eliminate the possibility of synthesis filter instabilities. Secondly, a new method for calculating the k-parameters of an LPC inverse filtering algorithm is developed, STREAK.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1974
Accession Number
ADA004973

Entities

People

  • Steven Frank Boll

Organizations

  • University of Utah

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Classification
  • Coding
  • Coefficients
  • Computer Programming
  • Decoding
  • Detection
  • Estimators
  • Filters
  • Filtration
  • Frequency
  • Linear Systems
  • Reflection
  • Speech Quality
  • Speech Transmission
  • Standards
  • Waveforms

Fields of Study

  • Engineering

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Computational Linguistics
  • Fluid Mechanics and Fluid Dynamics.