Average Spectral Shape

Rolloff: how rapidly the energy falls off as you go into the higher partials/harmonics.

See rolloff.m: examples showing harmonic intensity falling off by 0 dB, 3 dB, 6 dB, 9 dB, and 12 dB per octave (respectively, from bottom to top).

**Figure 1:** Spectral rolloff.
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``Music 175: Timbre'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).