�
David and Neil,
you should look at Keith Lent's 1989 article:



https://www.jstor.org/stable/3679554
and my 1995 article:
https://secure.aes.org/forum/pubs/journal/?elib=7947
it's really crude, but with a really good pitch detection alg (in this pitch 
shifter, octave errors in the pitch detection matter) you can window off a 
single cycle with a
decent window and output that windowed "grain" (that you might think of as an 
IR) at a rate of the new fundamental frequency.� there is more overlap with 
upshifting and less overlap with downshifting.� this is the alg we used in some 
of the old Wave Mechanics plugs (when autotune
still sounded like Munchkinization) back in the 1990s.� you need a good pitch 
detector that works well on vocals.
i know there are other articles.� google "formant preservation" or something 
like that.
L8r,

--



r b-j� � � � � � � � � � � � �r...@audioimagination.com



"Imagination is more important than knowledge."


---------------------------- Original Message ----------------------------

Subject: Re: [music-dsp] Auto-tune sounds like vocoder

From: ra...@raito.com

Date: Tue, January 15, 2019 2:34 pm

To: music-dsp@music.columbia.edu

--------------------------------------------------------------------------



> I have an unproven theory about that.

>

> The vocal tract has different filtering characteristics at different

> pitches. If you take a vocal sound and just pitch-shift it, you're also

> shifting the filter characteristics, and that doesn't sound right.

>

> I imagine that some clever person could do something akin (but definitely

> not the same) as an IR for vocals. Then there might be a shot at

> correcting pitch correctly.

>

> Neil Gilmore

> ra...@raito.com

>

> On Tue, January 15, 2019 1:05 pm, 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?

>>

>>

>> Just curious.

>> David Reaves

>> _______________________________________________

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>> music-dsp@music.columbia.edu

>> https://lists.columbia.edu/mailman/listinfo/music-dsp

>

>

> _______________________________________________

> dupswapdrop: music-dsp mailing list

> music-dsp@music.columbia.edu

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�
�
�
�

        
�
�


        --

        

        r b-j� � � � � � � � � � � � �r...@audioimagination.com

        

        "Imagination is more important than knowledge."

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