Polyphonic Vocal Intonator/Harmoniser 2

Tim Kleinert

This is a further development of this patch:
http://www.electro-music.com/forum/topic-26222.html

The pitch-shifting core circuit has changed somewhat. I followed my weird idea about doing a wavecycle-based kind of formant-correction. Basically, instead of pitch-shifting, this circuit performs a sort of VOSIM-style processing on the voice signal. Individual tonal wavecycles of the incoming audio are recognized and then brutally ( Laughing

) hardsynced to a carrier wave (which defines the new pitch), and the resulting steep waveform flanks smoothed out afterwards. In this way, the formants of the original signal are preserved.

It's an admittedly crude technique, and so I was amazed at how good it actually works. It sounds way better than expected, more artificial than a resynthesis-based algorithm, but still more natural than a vocoder. Also, since it works with a totally different concept, the voiced-unvoiced processing (from the first version) isn't necessary anymore, so I threw it out.

Controls:

INPUT Source, Pad: select audio input channel etc.
INPUT GATE (parameters): noise gate for the input
INPUT COMP (parameters): compressor for the input

PITCH RECOGNISE Response: Response speed of the adaptive pitch-tracker.
PITCH RECOGNISE Deviate: erm... difficult to explain. Basically defines the "deviation allowance window" between cycles. If this doesn't make any sense at all Laughing

never mind. Just tweak it and listen to the results.
WAVE Edge: Controls the smoothing of the sharp waveform flanks caused by the VOSIM processing.
FORMANT <shift>: Yes sir Cool

. Shift formants upwards for a dwarf choir, or downwards for a ogre choir. Zero is original formant
PITCH (parameters): target pitch
VIBRATO (parameters): vibrato of the target pitch

...plus, again, some self-explanatory EQ and FX stuff.

VoiceIntonate2TK.pch2

Description:

New version, with formant correction/manipulation (yes sir)

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VoiceIntonate2TK.pch2

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