If you do something that interacts with reality, like sending something through [comport] using [metro] to schedule it, you will find that the actual messages show up on the serial connector on either side of the audio blocks, so that the average timing over a lot of messages is exact but any particular event will be within about 5 ms of the correct time.
Martin
Derek Holzer wrote:
To: Claude Heiland-Allen claudiusmaximus@goto10.org CC: pd-list@iem.at Subject: Re: [PD] timing question Date: Mon, 17 Dec 2007 15:55:28 +0100
Thanks, Zen-Master Claudius. Your quantum revelations still leave me wondering, however, what is the minimum time between two events which can be scheduled?
I teach my students that the reason you can't send audio to "message" (i.e. non-audio) objects is that "message" objects run slower. While this may not be "logically" correct to many of the hackers that live on this list, it is a convenient way to explain the difference to artists just beginning in this world. Block size was the technical answer I gave.
Now that I know this is false, I need a new explanation. Plus I'd like to know what the limits of message processing speed are. In "real time", please.
best, d.
Claude Heiland-Allen wrote:
Derek Holzer wrote:
Hi all,
Charles Henry wrote:
On Dec 17, 2007 3:03 AM, Frank Barknecht fbar@footils.org wrote:
Hallo, Charles Henry hat gesagt: // Charles Henry wrote:
[metro 1] creates a bang each millisecond, approximately. The
message
rate is constrained by the block size, so you would want to put
[metro
1] inside of a subpatch with [block~ 1] for best time resolution.
That's not true. Message rate is not related to the dsp vector size.
My mistake. I thought messages had to run in between dsp blocks.
Someone please refresh/adjust my memory... what IS the message rate in PD? I also thought it was related to block size all these years. And how can it be changed if needed?
There is no fixed rate, it's event-based with continuous time (or as continuous as floating point numbers gets you). But - it works with "logical" time, any relationship to "real" time is purely a coincidence.
Claude
-- derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista ---Oblique Strategy # 81: "Go to an extreme, move back to a more comfortable place"
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