Aren't Auto-Tune and similar built on LPC vocoders? I had the impression that was publicly known (recalling magazine interviews/articles from the late 90s). The secret sauce being all the stuff required for pitch tracking, unvoiced segments, different tunings, vibrato, corner cases, etc.
But as far as "sounds like a vocoder," the basic nature of the effect is exactly that: you have a formant filter that tracks the input speech, which you excite with a synthetic signal. If that synthetic signal tracks the real excitation very closely, this sounds quite natural. If you push hard on the effect (or just do a bad job at the synthesis part), the artificial nature of the excitation becomes apparent and the result is essentially the "classic" synthesizer-driven vocoder sound. Also the factors others have mentioned: stuff like hard pitch quantization and intermodulation artifacts make the excitation sound "robotic", and you get a further chorus effect from mixing with unprocessed input. Ethan On Wed, Jan 16, 2019 at 1:16 AM Andy Farnell <padawa...@obiwannabe.co.uk> wrote: > On Tue, Jan 15, 2019 at 08:05:11PM +0100, David Reaves wrote: > > > I’m wondering about why the ever-prevalent auto-tune effect in much > > of today's (cough!) music (cough!) seems, to my ears, to have such > > a vocoder-y sound to it. Are the two effects related? > > So, I would say yes, they're related. Weakly. As Sampo says, > the method is essentially a grain-wise Fourier reconstruction. > Upshot is it sounds like a vocoder because it is the voice > 'vocoded' with a pulse stream at near to the original fundamental > (but corrected). Additionally two other things enhance the > psychoacoustic impression that it's a classic vocoder. First > is the pitch quantisation, so when you glissando there's > a stepped effect that makes the banding stand out more. > And second, as Ben says, some mixing of the dry and wet usually > produces a chorus/flanger effect on top. > > Disclaimer: I have never seen the Antares source code so > could be guessing very wrongly, but that's what my ears think. > > best, > Andy > > > > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp
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