Improvement of the Narrowband Linear Predictive Coder. Part 1. Analysis Improvements.

Abstract

The narrowband linear predictive coder (LPC) is widely used in both civilian and military applications. Yet, in spite of the many improvements over the years, it is still not universally acceptable to general users. This report presents improvements to five aspects of the LPC analysis which have drawn little attention in the past. These improvements are frequency spreading of sibilant sound spectra, adaptive placement of the analysis window at onsets, modified LPC analysis for sustained vowels, enhancement of LPC spectra in noise, and an automatic gain control. These improvements may be incorporated in the existing narrowband LPC without interfering with the speech sampling rate, the frame rate, or the parameter coding.

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Document Details

Document Type
Technical Report
Publication Date
Dec 27, 1982
Accession Number
ADA124313

Entities

People

  • G. S. Kang
  • S. S. Everett

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Algorithms
  • Ambient Noise
  • Automatic Gain Control
  • Background Noise
  • Bandwidth
  • Department Of Defense
  • Detectors
  • Dynamic Range
  • Frequency Bands
  • Front End Processors
  • Human Factors Engineering
  • Military Research
  • Noise Reduction
  • Signal Processing
  • Speech Quality
  • Transducers
  • Voice Communications

Fields of Study

  • Engineering

Readers

  • Speech Processing/Speech Recognition.
  • Systems Analysis and Design