[PD] phasor to square

raul diaz raul.lete at gmail.com
Sun Jan 20 17:18:20 CET 2008

Ups...I know!
My fail was to expect that phasor~ reaches a 0 value!
I agree with Roman, signal to message conversion losts accurary.
Would be better to use a masked phasor as synthesizer input, but how to
generate a masked phasor with a M:N cycles relation?
Maybe with a inverted phasor~ and samphold~?

I will try!


2008/1/20, Roman Haefeli <reduzierer at yahoo.de>:
> On Sun, 2008-01-20 at 16:18 +0100, raul diaz wrote:
> > I will try this way, but anyway i'm curious about [avg~] behaviour.
> > What's wrong on my "phasor-cycles-counter" patch?
> yo, i just had a quick look and it seems, that [avg~] currently isn't
> working on my system (so isn't [tavg~], both don't give any output at
> all). don't have the time to investigate that now.
> the first problem is the comparison with [==~ 0]. the signal from
> [phasor~] reaches practically never exactly 0, unless the frequency of
> it is some integer fraction of the sampling frequency and the phase is
> set accordingly. this is because the moments, where the amplitude would
> reach 0, is most of the time somewhere in between two subsequent
> samples, but almost never exactly at sampling time. you can check that
> by writing the signal of a [phasor~ 9213] to a table and have a look at
> all the amplitude values. also the output of [==~ 0] will miss most of
> the cycles and almost always be 0.
> the next problem is, that [avg~] updates only every 64 samples. with
> higher frequencies, [avg~] would miss some the cycles. further [avg~]
> outputs a float messages, which is still a float message after [change],
> which overwrites the internal value of [f ]. you cannot build a counter
> that is triggered by a float. you would need a bang here. a construct
> like:
> [avg~]
> |
> [sel <somevalue>]
> |
> [f ] etc.
> would be more likely to work.
> please someone correct me, if this is totally non-sense, but my
> experience is, that it is usually much easier to generate/synthesize a
> signal than using some sample-level detection methods to compose it.
> often a conversion from signal to message domain means loosing accuracy
> because of the blocksize or at least the result is coming one block
> late.
> roman
> ___________________________________________________________
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Raul Diaz Poblete
raul.lete at gmail.com
Barcelona [Spain]
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