Accession Number : AD0810289

Title :   CALCULATIONS OF THE EFFECTS OF PEAK CLIPPING ON SPEECH-LIKE SIGNALS.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Dietrich, William Varner

Report Date : DEC 1966

Pagination or Media Count : 118

Abstract : Peak clipping is a well known method of increasing the average power output of a peak power limited voice communication transmitter. Although the clipping process introduces distortion, articulation tests have shown that clipped speech remains highly intelligible. Using idealization of vowel sounds based on the mechanism of speech production, calculations were made of the spectra resulting from clipping these speech-like signals. The results indicate a high degree of similarity between the spectra before and after clipping. The power gained by clipping at audio frequency and at narrowband was calculated and compared with previously published data. Repeaking due to component rejection was investigated for clipping at audio and narrowband. Calculations of the effect of varying the phase characteristic of the signals before clipping indicate that such variation may improve the intelligibility of clipped speech. (Author)

Descriptors :   *LIMITERS), (*SPEECH TRANSMISSION, INTELLIGIBILITY, SPEECH, VOICE COMMUNICATIONS, INFORMATION THEORY, CLIPPER CIRCUITS, AUDIO FREQUENCY, NARROWBAND.

Subject Categories : Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE