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| quote: | | Often it is believed that the pitched sounds (like piano,organ,choir,etc.) for a single note have a frequency, it's actually harmonics and nothing more. Many people try to synthesize a sound using an exact frequency+harmonics and observe that the result sounds too “artificial”. They might try to modify the harmonic content, add a vibrato, tremolo, but even that doesn't sound “warm” enough. The reason is that the natural sounds don't produce an exact periodic; their sounds are quasi-periodic. Please notice that not all quasi-periodic sounds are “warm” or pleasant. |
from http://wiki.linuxaudio.org/wiki/zynaddsubfx_manual
In the first chapter it has some graphs that illustrate the idea pretty nicely. I realize this is a manual for an opensource synth plugin but their explanations of "warmth" are very helpful.
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