A variance detector for signal-gap discrimination in noisy speech channels
By: by James L. Wayman
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1985
Place of publication: Monterey, California
Language: eng
Subjects: Oral communication; Sound analyzers
Description: This report documents a program written for post- (FFT) processor activity/gap detection in noisy speech communication channels. The algorithm used is based on the assumption that the variance of the logs of the frequency-domain magnitudes of a signal is greater than the corresponding variance of the channel noise. Trade-offs between Type I and Type II errors can be controlled with and interactively defined program parameters. Parameters were found to yield a 16% missed detection rate with a 5% false alarm rate, performance entirely acceptable in speech compression applications. Some problems were encountered with sibilate detection, due to the close relationship between these sounds and white noise. (Author)
Notes: Title from cover.

"Prepared for: Naval Postgraduate School"--Cover.

"May 1985"--Cover.

"Technical report for period August 1984 - September 1984"--Cover.

"NPS-53-85-0007"--Cover.

Author(s) key words: Signal/gap detection, digitil signal processing of speech.

Includes bibliographical references.

"Approved for public release; distribution unlimited"--Cover.

Technical report; 1985.

kmc/kmc 12/1/09.

aq/  /aq cc:9116 11/06/97