Description:
AUTOBEND adjusts the frequencies of the formants depending on the fundamental frequency (<freqlist>).
It is base on a study by J. Sundberg describing showing that :
- The first formant remains fixed until the fundamental reaches its frequency, and then tracks the fundamental at the same frequency.
- The second formant moves downward in pitch as the fundamental moves > 200 Hz, but when the interval between the fundamental and its frequency has decreased to an octavve + env. 30Hz, this interval is maintained and the formant moves in parallel.
The result is a list of calculated formant frequencies.
Note : only the first and second frequencies are modified.
This function is adapted from the original CHANT rules as implemented in CHANT by X. Rodet and Y. Potard (1984) and in the chant_autobend object for Max by F. Iovino and, G. Eckel (1994).
Documentation adapted from the CHANT manual, P.-F. Baisnée and the Chant group, 1985.
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