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Found an idea in the literature I never would have thought of, and… - Notes from a Medium-Sized Island [entries|archive|friends|userinfo]
Jason

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[Dec. 19th, 2015|12:04 pm]
Jason
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Found an idea in the literature I never would have thought of, and it's so simple and brilliant:
http://auditoryneuroscience.com/topics/speech-modulated-signal
take the spectrogram of an audio recording of speech, (being sure to plot frequency on a linear, not logarithmic scale) and take the 2d fourier transform of that, considered as an image. Because you plotted frequency on a linear scale, harmonics of a fundamental frequency show up as oscillations, in the spectrogram, in the y-direction! Low-frequency oscillations in time in the original signal still show up as oscillations in the spectrogram in the x-direction.
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Comments:
From: altamira16
2015-12-20 03:39 pm (UTC)
Cepstral analysis is also a thing.
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From: eub
2015-12-21 08:36 am (UTC)
Somewhat reminiscent of the techniques for video motion magnification, IIRC.
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