Accession Number:

ADP005604

Title:

Effect of Audio Bandwidth and Bit Error Rate on PCM (Pulse Code Modulation), ADPCM (Adaptive Differential Pulse Code Modulation, and LPC (Linear Predictive Coding) Speech Coding Algorithm Intelligibility,

Descriptive Note:

Corporate Author:

HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1987-02-01

Pagination or Media Count:

7.0

Abstract:

This paper describes and quantifies the effects of audio bandwidth and bit error rate on speech intelligibility of voice coders in noise. The research was conducted within the Biological Acoustics Branch of the United States Air Force, Harry G. Armstrong Aerospace Medical Research Laboratory. Three different speech coding techniques were investigated, pulse code modulation PCM, adaptive differential pulse code modulation ADPCM and linear predictive coding LPC. Speech intelligibility was measured in realistic acoustic noise environs by a panel of 10 subjects performing the Modified Rhyme Test MRT. Summary data is presented along with planned future research in optimization of audio bandwidth vs bit error rate tradeoff for best speech intelligibility. Author

Subject Categories:

  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE