| (a) A pure sine wave has a simple spectrum with just one frequency. |
| (b) Any repeated waveform has a spectrum consisting of partials whose frequencies are integer multiples of a fundamental frequency. |
| (c) The less a repeated waveform looks like a simple sine wave, the richer the spectrum (i.e. many strong partials). |
| (d) A repeated waveform that does not look like a sine wave has partials that are not integer multiples of a fundamental frequency. |
| (e) A waveform of random but endlessly repeated shape has a random spectrum. |
| (f) A waveform of random but endlessly repeated shape has a spectrum consisting of partials whose frequencies are integer multiples of a fundamental frequency. |