Surprisingly, googling for mq synthesis produces fewer results than I
thought. It's not very recent but my understanding is that it was the
relatively modern approach to a phase vocoder. I didn't find any library
implementing it but I found a couple older papers about it.

Does anybody else know more about whether mq analysis/synthesis has been
left behind by the industry? I'm also not familiar with Serra's work on
sinusoid + noise. Maybe it's the better algorithm.

I'm also curious if anybody knows whether the melodyne/Antares class of
algorithms have a speech model in them. I'm unclear if OP wanted pitch
shifting for instrumental music or not, but I'm definitely curious about
the state of the art for musical frequency/scale modification for
instrumental musical signals.

-Stefan S

On Sat, May 19, 2018, 13:35 RJ Skerry-Ryan <> wrote:

> It may not be the state of the art, but RubberBand
> <> is, I believe, the best open
> source pitch shift / time stretch library out there at the moment, and can
> run in realtime on modern CPUs. SoundTouch
> <> is another good option that is
> cheaper to compute (and therefore easier to run in realtime on e.g. a
> mobile CPU).
> Mixxx <> uses both (giving the user the choice, since
> they may want SoundTouch on older CPUs) for realtime pitch shifting and
> tempo adjustment.
> On Sat, May 19, 2018 at 1:29 PM gm <> wrote:
>> Am 19.05.2018 um 20:19 schrieb Nigel Redmon:
>> > Again, my knowledge of Melodyne is limited (to seeing a demo years
>> > ago), but I assume it’s based on somewhat similar techniques to those
>> > taught by Xavier Serra (—anyone know for
>> > sure?
>> I always thought the seperation of notes was based on cepstrum?
>> My idea is that a harmonic tone, comb like in the spectrum, is a peak in
>> the cepstrum. (isn't it?)
>> Probably then you can also track pitch by following a peak in the
>> cepstrum.
>> Not sure if this makes sense?
>> I never tried Melodyne in person so I am not sure what it is capable of.
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