Accession Number:

AD0646781

Title:

INTELLIGIBILITY TEST METHODS AND PROCEDURES FOR THE EVALUATION OF SPEECH COMMUNICATION SYSTEMS.

Descriptive Note:

Final rept.,

Corporate Author:

BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS

Report Date:

1966-12-01

Pagination or Media Count:

65.0

Abstract:

In further exploring the Modified Rhyme Test MRT, a recently developed intelligibility test designed for the evaluation of speech communication systems under operational military conditions, research has been conducted in the following areas a the relation between MRT scores and other intelligibility test scores for various types and levels of speech distortion b the influence of the closed-response format and listening experience on MRT scores and c speaker intelligibility and the selection of speakers for recording the test lists. The present report describes the work undertaken in each of these areas. The ultimate objective of the work is the development of valid procedures for the efficient evaluation of speech communication systems. The major experimental results demonstrate that 1 the relation between scores obtained with different intelligibility test materials is not unique but depends considerably on the type of speech distortion employed, 2 neither the closed-response format nor prior listening experience appreciably affects MRT scores, and 3 less intelligible speakers tend to be those whose voiceless consonants are generated with lower intensity, particularly in word-final position. Author

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE