[PD] phase locked loop

[Simon Iten]

hi charles,

interesting approach!

unfortunately i have a very busy few weeks with some (musical) deadlines, so i did not do much work on this.

i tried my version of the gr300 guitar synth patch again for bass and it works quite well but needs a lot of filtering (maybe also adaptive filtering) to avoid octave jumps.

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this are the brains of one channel? it is a rather simple approach but with adequate filtering it should work well for a constrained range. it sure worked well on the gr300 in the 80ies, but that was in analog territory. my implementation works exceptionally well for vocals with a little filtering on the input, and there is very little lag.




> On 27 Mar 2023, at 16:43, Charles Z Henry <czhenry at gmail.com> wrote:
> 
> On Mon, Mar 27, 2023 at 3:33?AM Claude Heiland-Allen <claude at mathr.co.uk> wrote:
> 
>> The [hilbert~] abstraction that comes with Pd has two all-pass biquad
>> filters that give outputs approximately 90 degrees out of phase from
>> each other, so calling its two outputs x and y, phase can be
>> approximated with atan2(y, x) and amplitude with sqrt(x^2 + y^2).
>> I don't know whether it works as-is for bass frequencies though - maybe
>> needs a [deephilbert~] version?
> 
> I'm starting in on looking at that with ELSE's [biplot] abstraction.
> So far, just copying/pasting things, like coeff from hilbert~ biquads
> (2 in series for the left outlet, 2 in series for the right).  I'll
> need to modify for adding/subtracting the phase results from each
> other and to reduce the range to see the lowest freq in detail
> https://github.com/czhenry/czbs/blob/master/analyze_hilbert.pd
> 
> 
> 
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