Abstract
IN NATURE of December 24, p. 965, Prof. E. W. Scripture discussed difficulties in applying Fourier analysis to recorded vowel curves, and he published two illustrations of the latter. The second of these, or at least what the corresponding curve would have been if the process of ground noise suppression had not been used in the recording, is strikingly similar to a curve I once drew up to illustrate complex modulation of a carrier wave in radio. The ‘interior waves’ correspond to the carrier wave, and the regular repetition or pattern corresponds to the so-called ‘modulation envelope’.
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NISBET, R. Fourier Analysis and Vowel Curves. Nature 131, 401 (1933). https://doi.org/10.1038/131401a0
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DOI: https://doi.org/10.1038/131401a0
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