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 Forum index » Clavia Nord Modular » G2 Patches - Completed » Audio In
Polyphonic Vocal Intonator/Harmoniser 2
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1038
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 213

PostPosted: Tue May 13, 2008 10:07 am    Post subject:  Polyphonic Vocal Intonator/Harmoniser 2
Subject description: New version, with formant correction/manipulation (yes sir)
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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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 Filename:  VoiceIntonate2TK.pch2
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Last edited by Tim Kleinert on Wed May 14, 2008 12:58 am; edited 2 times in total
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mosc
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Joined: Jan 31, 2003
Posts: 17618
Location: Allentown, PA
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PostPosted: Tue May 13, 2008 10:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Tim. this one works! Laughing

#1 and #2 each have their charms.

Two thumbs up... thumright thumleft

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iPassenger



Joined: Jan 27, 2007
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Location: Sheffield, UK
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PostPosted: Tue May 13, 2008 11:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Absolutely awesome. I liked the first one but my rubbish mic wasn't loving it but this one is so smooth. Smile

Great work.

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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1038
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 213

PostPosted: Wed May 14, 2008 1:48 am    Post subject: Reply with quote  Mark this post and the followings unread

iPassenger wrote:
I liked the first one but my rubbish mic wasn't loving it but this one is so smooth. Smile


Yes, the voiced/unvoiced-processor was difficult to tame. Also, this design is incapable of pitch-warbling, as the wave cycles are brutally forced into line via hardsync.
I still get the occasional waveform warble though, especially when not singing/talking clearly. That is due to the "multiple-zero-crossings-periodicity"-detection (meaning: recognition of periodic oscillations with more than one zero crossing) not being 100% bulletproof, causing discrete "phase-jumps". I'm mulling over alternative approaches to that issue. I'll post an update if it works.

Anyhow, my current favourite performance shtick with this patch is to assign the formant control to the modwheel. A choir of "mes" morphing into dwarfs as I sing. Classic. Laughing

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seraph
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Joined: Jun 21, 2003
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PostPosted: Wed May 14, 2008 2:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Quentin Crisp wrote:
"If music continues on its present course, the human race will sink back into an amoebic state where it will take a coagulation of hundreds of teenagers to from a single cogent thought."


did Quentin mean form Question unfortunately it does not seem to apply to teenagers only Crying or Very sad

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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1038
Location: Zürich, Switzerland
Audio files: 6
G2 patch files: 213

PostPosted: Wed May 14, 2008 2:50 am    Post subject: Reply with quote  Mark this post and the followings unread

oh, a typo, sorry, thanks for pointing it out. fixed.
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