A variance detector for signal-gap discrimination in noisy speech channels
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Authors
Wayman, James L.
Subjects
Signal/Gap detection
Digitial signal processing of speech
Digitial signal processing of speech
Advisors
Date of Issue
1985-05
Date
Technical Report For Period
August 1984 - September 1984
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
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 an interactively defined program paramters. 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.
Type
Technical Report
Description
Series/Report No
Department
Organization
Identifiers
NPS Report Number
NPS-53-85-0007
Sponsors
Prepared for: The Naval Postgraduate School
Monterey, California
Funding
Format
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.