Calculations of the effects of peak clipping on speech-like signals
Dietrich, William Varner
Ewing, Gerald D.
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Peak clipping is a well known method of increasing the average power 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 idealizations 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.
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