SUBSCRIBER ACTIVITY-MEASUREMENT OF SOME PERFORMANCE FACTORS OF VOCODERS.
ITT FEDERAL LABS PALO ALTO CALIF
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The purpose of this task was to determine the degree of intelligibility and overall quality factors of certain speech processing devices. A magnetic tape catalog of speech samples from these devices was prepared for further reference. Additional speech processing equipment data such as size, weight, cost, etc., is summarized which may per pertinent for system design considerations. Input magnetic test tapes, containing speech with several background conditions, were run through the speech processing devices while in back-to-back operation. Samples from the ouput processed tapes were arranged into a suitable matrix design and administered to listeners to obtain intelligibility and quality scores. The determination of the intelligibility and overall quality factors of the investigated devices was accomplished in accordance with previously prepared performance standards and test specifications. The results of this investigation indicate that there are several speech processing devices that perform satisfactorily in back-to-back operation. Author