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INTERMODULATION DISTORTION: A CONTROLLABLE PARAMETER IN THE ANALYSIS OF THE INTELLIGIBILITY OF CLIPPED SPEECH.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Speech clipping test conducted on single sideband systems have indicated that clipped SSB speech signals are more intelligible than clipped audio speech signals. The importance of this result is that it is experimental evidence of the important relation between the intermodulation products generated in the clipping process and the intelligibility of clipped speech. This study considers the general problem of the intellibibility of clipped speech from the viewpoint of intermodulation distortion. By combining the results of previous studies of clipped speech with the theories of speech and hearing the relation of intermodulation distortion to the intelligibility of clipped speech is established. Then by simple mathematical analysis, a specific method for improving intelligibility is proposed. Experimental evidence in the form of two tone tests is presented to verify that the proposed method significantly reduces intermodulation distortion. The significance of reduced intermodulation distortion in the clipping process is that it engances intelligibility. Author
APPROVED FOR PUBLIC RELEASE