Evaluating the Performance of the LPC (Linear Predictive Coding) 2.4 kbps (Kilobits per second) Processor with Bit Errors Using a Sentence Verification Task.

Abstract

The comprehension of narrowband digital speech with bit errors was tested by using a sentence verification task. The use of predicates that were either strongly or weakly related to the subjects (e.g., A toad has warts./ A toad has eyes.) varied the difficulty of the verification task. The test conditions included unprocessed and processed speech using a 2.4 kb/s (kilobits per second) linear predictive coding (LPC) voice processing algorithm with random bit error rates of 0%, 2%, and 5%. In general, response accuracy decreased and reaction time increased with LPC processing and with increasing bit error rates. Weakly related true sentences and strongly related false sentences were more difficult than their counterparts. Interactions between sentence type and speech processing conditions are discussed. Keywords: Intelligibility; Voice communications; Speech recognition; Speech transmission.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1987
Accession Number
ADA188573

Entities

People

  • Astrid Schmidt-nielsen
  • Howard J. Kallman

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Algorithms
  • Alphabets
  • Cognitive Systems Engineering
  • Communication Systems
  • Comprehension
  • Computer Programming
  • Contrast
  • Engineering
  • Intelligibility
  • Military Research
  • Psychology
  • Reaction Time
  • Recognition
  • Standards
  • Systems Engineering
  • Voice Communications
  • Word Recognition

Readers

  • Brain and Cognitive Science; Experimental Psychology; Cognitive Neuroscience
  • Mathematical Modeling and Probability Theory.
  • Speech Processing/Speech Recognition.

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference
  • AI & ML - Information Retrieval