Accession Number : ADA288824

Title :   Speech Analysis and Synthesis Based on Pitch-Synchronous Segmentation of the Speech Waveform.

Descriptive Note : Rept. for 1 Oct 92-30 Sep 93,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Kang, George S. ; Fransen, Lawrence J.

PDF Url : ADA288824

Report Date : 09 NOV 1994

Pagination or Media Count : 55

Abstract : This report describes a new speech analysis/synthesis method. This new technique does not attempt to model the human speech production mechanism. Instead, we represent the speech waveform directly in terms of the speech waveform defined in a pitch period. A significant merit of this approach is the complete elimination of pitch interference because each pitch-synchronously segmented waveform does not include a waveform discontinuity. One application of this new speech analysis/synthesis method is the alteration of speech characteristics directly on raw speech. With the increased use of man-made speech in tactical voice message systems and virtual reality environments, such a speech generation tool is highly desirable. Another application is speech encoding operation at low data rates (2400 b/s or less). According to speech intelligibility tests, our new 2400 b/s encoder outperforms the current 2400-b/s LPC. This is also true in noisy environments. Because most tactical platforms are noisy (e.g., helicopter, high-performance aircraft, tank, destroyer), our 2400-b/s speech encoding technique will make tactical voice communication more effective; it will become an indispensable capability for future C4I.

Descriptors :   *SPEECH ANALYSIS, *VOICE COMMUNICATIONS, TEST AND EVALUATION, COMMAND CONTROL COMMUNICATIONS, SYNTHESIS, WAVEFORMS, CODING, INTERFERENCE, PATTERN RECOGNITION, SPEECH TRANSMISSION, MILITARY APPLICATIONS, DATA RATE, MESSAGE PROCESSING, TACTICAL COMMUNICATIONS, INTELLIGIBILITY, VOCODERS, SOUND PITCH.

Subject Categories : Voice Communications
      Command, Control and Communications Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE