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An investigation of methods of improving the intelligibility of audio-frequency speech in noise

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Author
Huddy, Norman Walter
Date
1966-10
Advisor
Ewing, Gerald D.
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Abstract
A discussion of the nature of speech is presented, followed by a review of speech processing to date, with emphasis on the characteristics of speech which must be retained for intelligibility. Methods of measuring speech intelligibility are described. The relative merits of abrupt and gradual audio clipping of speech are investigated, and two tone and articulation test results are presented showing that there is no significant difference in these methods of clipping with respect to speech intelligibility. Processing of speech to radio frequencies, filtering and retranslat ion to audio to improve the peak to average value ratio of the audio frequency prior to transmitting it through a noisy channel is investigated. Two tone and articulation test results are presented showings, that this processing results in a 20% improvement in speech intelligibility over audio clipping and filtering.
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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.
URI
http://hdl.handle.net/10945/9554
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  • 1. Thesis and Dissertation Collection, all items

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    Calculations of the effects of peak clipping on speech-like signals 

    Dietrich, William Varner (Monterey, California. U.S. Naval Postgraduate School, 1966-12);
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    A double-sideband radio-frequency speech processor for increasing the intelligibility of speech signals over noisy single-sideband channels 

    Belanger, Raymond Louis (Monterey, California; Naval Postgraduate School, 1971-09);
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    Intermodulation distortion: a controllable parameter in the analysis of the intelligibility of clipped speech 

    Lannes, William Joseph (Monterey, California. U.S. Naval Postgraduate School, 1966-05);
    Until the experiments conducted on Single Sideband speech clipping in the early 1960's, very little work had been done in the field of conventional speech processing or clipping since the late 1940's. Although the SSB ...
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