[gmpi] Re: GMPI reqs draft 1 (part 2) for review
- From: Jeff McClintock <jeffmcc@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Fri, 31 Dec 2004 10:03:29 +1300
Small note on 4.10: Ramped or Smoothed Events
"In fact, these audio-rate events can eliminate the
need for ramps altogether."
It might be worth noting that audio rate controls - actual
or this bybrid kind - add hidden costs (downsampling) when
plugins morph internal coefficients to avoid doing the full
control value to coefficients transform for each sample.
Hi,
Well, downsampling can be as simple as using, say every 8th sample and
discarding the remainder. Not a huge overhead.
My synths have the opposite problem, how to convert discrete parameter
updates into a smooth, zipper-noise-free signal.
Anytime I receive a parameter update, I ramp smoothly to the new
value. Trouble is, I don't know what rate the host will send updates.
the result is far from ideal...
http://www.synthedit.com/stepped.gif
I figure this is analogous to upsampling a signal without knowing the
sample rate, it's simply not possible to do so perfectly. There is not
enough information. The entire concept of sending parameter changes as
discrete events is flawed. UNLESS:
-The host could indicate the rate at which parameter changes occur
-or the host included more info with each parameter change, i.e. a rate
at which to ramp toward the new value.
Including this extra information would allow much better recontruction
of the intended (smooth) parameter signal.
Best Regards,
Jeff
----------------------------------------------------------------------
Generalized Music Plugin Interface (GMPI) public discussion list
Participation in this list is contingent upon your abiding by the
following rules: Please stay on topic. You are responsible for your own
words. Please respect your fellow subscribers. Please do not
redistribute anyone else's words without their permission.
Archive: //www.freelists.org/archives/gmpi
Email gmpi-request@xxxxxxxxxxxxx w/ subject "unsubscribe" to unsubscribe
Other related posts:
