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Fig. 1:(a) The pitch helix. The musical scale is wrapped around so that each circuit (red) is an octave. The equivalent change in pitch height with fixed chroma is shown (blue). (b) Examples of sounds with changing pitch height. Each of these harmonic complexes (h1, h2, h3) has a flat spectral envelope in the frequency band 0 - 4 kHz. In h1 (top), all harmonics of the fundamental, f0, have equal amplitude; in h2 (middle), the odd harmonics are attenuated by 10 dB, producing a large increase in pitch height without changing pitch chroma; in h3 (bottom), the odd harmonics are completely attenuated, producing a one octave rise in pitch height with the same chroma (2f0).
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|current||14:01, 11 September 2008||497×373 (87 KB)||AlessandroB|