[PD-dev] [PD] Rewriting a unified phasor / metro object for reading tables
morph_2016 at yahoo.co.uk
Thu May 9 15:34:06 CEST 2013
This is what it used to look like (forgot to include the pic ;)
Ninja Jamm - a revolutionary new musix remix app from Ninja Tune and Seeper, for iPhone and iPad
Gemnotes-0.2: Live music notation for Pure Data, now with dynamics!
----- Original Message -----
> From: Ed Kelly <morph_2016 at yahoo.co.uk>
> To: i go bananas <hard.off at gmail.com>; Ivica Ico Bukvic <ico at vt.edu>
> Cc: PD List <pd-list at iem.at>; pddev <pd-dev at iem.at>
> Sent: Thursday, 9 May 2013, 14:33
> Subject: Re: [PD] Rewriting a unified phasor / metro object for reading tables
> I figured out how to do this.
> Generally the problem is this: the signals to run four independent tracks in my
> patch are all devised from one phasor~ object that scans a single bar of
> material. Clicks then appear in the material when jumping from one bar to the
> next, because the control events are quantized to the 64 samples of a block. So
> we get lines like the picture enclosed that read the material using tabread~.
> In order to get rid of the clicks, I have an alternative method for reading the
> material _without_ adding any new DSP objects (this has to run on an iPhone 4).
> It involves the phasor~-esque object ramping from 0 to 8 over 8 bars or not,
> depending on whether it is jumping around or smoothly reading the 2, 4 or 8-bar
> I already have this working - it has to detect when the ramp is crossed and
> generate a clock signal from it for the intra-bar rhythms. I took phasorshot~ as
> my prototype, but that had the same problem as before, namely that non-signal
> pulses are quantized to 64 sample blocks. I tried using clocks but they went out
> of sync while the tempo was being changed of course.
> So, I built an object where all the clocks are derived from the phasor ramp, but
> sent out as control rather than DSP signals. It uses more CPU than phasor~ does
> (~70% more) but no matter how much you speed-up or slow down the phasor~
> on-the-fly, the clocks never go out-of-sync. It's called phasorbars~.
> I'll be uploading a version of the external soon to svn, and anyone
> who's downloaded Ninja Jamm for their i-device will get an update soon also.
>> why not just make a half speed phasor~, retrigger the phase to zero with a
> normal metro, and then multiply the output by 2?
>> On Thu, May 9, 2013 at 10:09 AM, Ivica Ico Bukvic <ico at vt.edu> wrote:
>> Assuming you want a pulse in non-signal domain, you could use disis_phasor~
> (see http://l2ork.music.vt.edu/main/?page_id=56 for download links) which
> outputs a bang every time ramp is crossed. This is only accurate to the nearest
> sigvs size (by default 64 bytes) as there is no guarantee that you will get a
> msg interrupt exactly at the time ramp has crossed.
>>> From:pd-list-bounces at iem.at [mailto:pd-list-bounces at iem.at] On Behalf Of
> Ed Kelly
>>> Sent: Wednesday, May 08, 2013 5:00 PM
>>> To: PD List; pddev
>>> Subject: [PD] Rewriting a unified phasor / metro object for reading
>>> Hi Lists(s),
>>> I'm rewriting phasor~ and unifying it with metro so that a pulse is
> generated from the boundaries of each ramp - so that bars of music can be read
> using tabread~ objects with a sample-accurate metro.
>>> I'm sure someone will say this can already be done, but it has to be
> dropped into the Ninja Jamm patch, so there isn't really time to rewrite the
> rest of the patch.
>>> I don't fully understand the way phasor~ wraps, but I have the
> object firing out bar numbers correctly. I'm putting clocks in for 16ths and
> 24ths of the beat, initiated on each wrap. I need to minimise CPU, so what I
> want to know is this:
>>> Does phasor~ always start from 0 and go to 1, i.e. is there always a
> signal value of 0 at the start of the ramp and a signal value of 1 at the end?
> As I write this, my common sense tells me it should be "yes" but I
> want to make sure. I suppose I should just try it really...
>>> Ninja Jamm - a revolutionary new musix remix app from Ninja Tune and
> Seeper, for iPhone and iPad
>>> Gemnotes-0.2: Live music notation for Pure Data, now with dynamics!
>>> Pd-list at iem.at mailing list
>>> UNSUBSCRIBE and account-management ->
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