Method and apparatus for enhancing the modulation index of speech sounds passed through a digital vocoder
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United States of America Patent
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May 2, 2017
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app pub date -
Dec 12, 2013
filing date -
Dec 12, 2013
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Abstract
A method and apparatus for enhancing modulation of certain speech sounds, such as trill sounds, are provided for radios which utilize digital vocoders. A digitized speech stream is sampled and the sampling is adjusted to determine, detect and enhance trill nulls in the digitized voice stream by one or more of: frame shifting the digitized speech input stream prior to vocoding, time expanding a digitized speech steam prior to vocoding, time compressing a digitized speech output stream after vocoding, and/or modulation enhancement and filtering of the a digitized speech output stream after vocoding.
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