Accompanying video for Reface DX voice "Wave Example" showing the realtime spectrum harmonic changes, as referenced in the FM Synthesis programming article on Yamahasynth.com You see the initial sawtooth wave harmonic series of all the integer harmonics (or overtones) created from Operators 1 and 2 with both Ops 1 & 2 frequency ratios of 1.00. Then as Op.2 level fades out, Operator 3 fades in set at a ratio of 2.00. The ratio of 1.00 for Op 1 and 2.00 for Op.3 creates a square wave timbre with only odd numbered integer harmonics, and the spectrogram shows the even harmonics fading out leaving just the odds. Finally, Op.3 fades out and Operator 4 fades in with a non-integer ratio of 4.77. The ratios of 1.00 for Op.1 and 4.77 for Op.4 creates non-integer overtones, and the spectrogram shows how these come in and create the non-integer (or inharmonic) overtones of a metallic/bell timbre.
Spectra Demo 1 - YouTube |
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| Music | Upload TimePublished on 1 Oct 2016 |
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