Research on Narrowband Communications

Abstract

We report on research toward a very-low-rate vocoder. This quarter we continued investigation in two areas: the phonetic vocoder and an unsupervised method for vocoding. We introduced phoneme pair probabilities to improve the accuracy of phonetic recognition. We investigated the use of the phonetic vocoder as a tool for semi-automatic labeling of speech. We also experimented with several variations of the phonetic vocoder to improve the intelligibility of the vocoded speech with a moderate increase of the bit rate. Our work in the second area concentrated on developing a novel method of spectral quantization: We quantize a sequence of spectra simultaneously. We are also evaluating a new distance metric that does not require the dynamic programming time warping.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1981
Accession Number
ADA104296

Entities

People

  • John Makhoul
  • Richard Schwartz
  • Salim Roukos

Organizations

  • BBN Technologies

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Algorithms
  • Automatic
  • Boundaries
  • Clustering
  • Computational Science
  • Computations
  • Computer Programming
  • Databases
  • Distortion
  • Dynamic Programming
  • Intelligibility
  • Markov Chains
  • Pattern Recognition
  • Probability
  • Recognition
  • Speech

Fields of Study

  • Computer science

Readers

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