Accession Number : ADA141194

Title :   Objective Speech Quality Evaluation of Real-Time Speech Coders.

Descriptive Note : Final rept. Jan 82-Jan 84,

Corporate Author : BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA

Personal Author(s) : Viswanathan,V R ; Russell,W H ; Huggins,A W F

PDF Url : ADA141194

Report Date : Feb 1984

Pagination or Media Count : 137

Abstract : This report describes the work performed in two areas: subjective testing of a real-time 16 kbit/s adaptive predictive coder (APC) and objective speech quality evaluation of real-time coders. The speech intelligibility of the APC coder was tested using the Diagnostic Rhyme Test (DRT), and the speech quality was tested using the Diagnostic Acceptability Measure (DAM) test, under eight operating conditions involving channel error, acoustic background noise, and tandem link with two other coders. The test results showed that the DRT and DAM scores of the APC coder equalled or exceeded the corresponding test scores fo the 32 kbit/s CVSD coder. In the area of objective speech quality evaluation, the report describes the development, testing, and validation of a procedure for automatically computing several objective speech quality measures, given only the tape-recordings of the input speech and the corresponding output speech of a real-time speech coder.

Descriptors :   *Speech recognition, *Coders, *Test and evaluation, Intelligibility, Real time, Synchronization(Electronics), Background noise

Subject Categories : Cybernetics
      Acoustics
      Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE