Accession Number : AD0811298

Title :   ADVANCED ECM SUSCEPTIBILITY MEASUREMENT OF VOICE COMMUNICATIONS EQUIPMENTS.

Descriptive Note : Quarterly rept. no. 3, 1 Oct-30 Dec 66,

Corporate Author : PHILCO-FORD CORP BLUE BELL PA

Personal Author(s) : Mutschler, C. ; Schultz, J. ; Strohmeyer, G.

Report Date : MAR 1967

Pagination or Media Count : 68

Abstract : This report describes progress on efforts to improve a technique for automatic intelligibility measurement of voice communication systems called CORODIM, an acronym for Correlation Of the Recognition of Degradation with Intelligibility Measurement. The evaluation of the new CORODIM computer program using vocoded input phoneme data is described. The scores calculated by the program are compared with those obtained by a listening jury to show the improvements which have been gained by the use of a new spectral analyzer with 44db dynamic range and a modified spectral matching technique. Scores are also presented for initial computer runs using unvocoded Pr data. The Pr data required by CORODIM for clear speech phoneme input is presented in both table and curve form and the methods used to develope this data are presented. Listening jury scores are also listed for the link simulation conditions which have been tested with clear speech data. A final evaluation of the spectrum synthesis technique is presented indicating that more study is required before it can be incorporated into the CORODIM logic. Progress on a design plan for equipment to replace the CORODIM computer program is presented including block diagrams and special circuit considerations.

Descriptors :   *VOICE COMMUNICATIONS, *ELECTRONIC COUNTERMEASURES, *COMPUTER PROGRAMS, INTELLIGIBILITY, VOCODERS, SPECTRUM ANALYZERS, PHONETICS, SPEECH RECOGNITION, SIGNAL TO NOISE RATIO, SIMULATION.

Subject Categories : Computer Programming and Software
      Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE