According to the Klatt 1990 paper, the F0 flutter delta should be calculated using modulation frequencies of 12.7 Hz, 7.1 Hz and 4.7 Hz The current implementation uses the time_count variable to calculate the amplitudes of these frequencies:
flc = sin(2*M_PI*12.7*time_count);
fld = sin(2*M_PI*7.1*time_count);
fle = sin(2*M_PI*4.7*time_count);
But time_count is incremented once per frame and therefore contains Hz * 100 and not Hz (the unit of time_count is 10ms instead of 1s). So the F0 modulation frequencies are actually too high by a factor of 100.
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According to the Klatt 1990 paper, the F0 flutter delta should be calculated using modulation frequencies of 12.7 Hz, 7.1 Hz and 4.7 Hz The current implementation uses the
time_countvariable to calculate the amplitudes of these frequencies:But
time_countis incremented once per frame and therefore contains Hz * 100 and not Hz (the unit oftime_countis 10ms instead of 1s). So the F0 modulation frequencies are actually too high by a factor of 100.Want to back this issue? Post a bounty on it! We accept bounties via Bountysource.