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This is a screenshot from Interactive 5, showing a recording of the word ‘yes’. This appears on the left-hand graph as a set of fuzzy pink lines in an ellipse shape, followed by a dense, lower-amplitude tail corresponding to the hiss in ‘yes’.

On the right-hand graph (the frequency-domain representation) is a series of vertical blue lines. These are quite high for the lower frequencies, to about 1 kilohertz, but there are smaller vertical blue lines (about one-eighth the amplitude of the lower-frequency waves) for all the frequencies, with the largest bunched around 4 kilohertz.

 4.7  Signals and noise