Spectrum

[Yalu K]

I noticed that the examples of spectrum in the video only plot one single speech sound. Does this imply that for speech processing spectrum is only useful when it plots a single speech sound? What information can we get from a spectrum which plots a whole utterance (if it is meaningful to do so)?

[Simon]

A “spectrum which plots a whole utterance” would show us the long-term average spectrum of the speech. This is somewhat interesting – for example, we can then infer what kinds of additive noise would, or would not, reduce the intelligibility of the signal.

But the long-term average spectrum is not useful for phonetic analysis, and that’s what we are focussed on here.

[Author]

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