AUTOAMP

[GENERIC-FUNCTION]


OM-Chant
Function Reference
ARGUMENTS:
  - FREQLIST list of formants' frequencies [default = (609 1000 2450 2700 3240)]
  - BWLIST list of formants' bandwidths [default = (77.64382 88.43109 122.9401 127.8438 137.6589)]
&optional
 
  - SCALER amplitude scaler factor [default = 1.0]

Description:

AUTOAMP calculates the amplitude of the formants depending on the frequencies (<freqlist>) and bandwidths (<bwlist>), taking into account the interactions between formants (reinforcement of the amplitudes of formants approaching one another).

It also scales the formant amplitudes with a function that varies as 1/f (approximation of a natural voice spectrum).

The result is a list of calculated formant amplitudes.

This function is adapted from the original CHANT rules as implemented in CHANT by X. Rodet and Y. Potard (1984) ('ata' flag) and in the chant_autoamp 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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