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An amplitude-modulated single-sideband waveform can be separated into two parts, viz., an amplitude or “envelope” term, and a frequency-modulation term. Some existing proposals for the use of the frequency-modulation part in speech compression schemes have been investigated, and although these schemes were found to be fallacious, some results having possible application to speech formant tracking were obtained.
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Cherry et al. (1961) studied this question.
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