[Jake P]

On pages 52, it is noted that “a non-repetitive waveform with a rapid rate of decay is represented by a much flatter curve, indicating that it has energy spread over a wider range of frequencies”. I understand why this should be the case, but then on the opposite page, in figure 4.13, wave (d) is just that, rapidly decaying and non-repetitive. Yet the spectrum has the same curve as the spectra for the other waves, which are repetitive. Why is this?
I can see why (d) is not represented with lines since the sound wave should take the sum of an extremely large number of sine waves, but I don’t understand the shape, or envelope here.

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