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 Kyma Forum
 Tips & Techniques
 Deriving a derivative...
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| Author | Topic: Deriving a derivative... |
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ezahp Member |
posted 06 March 2015 05:22
 
Hi, Apologies for what's probably a simple question but here goes: If I'm scrubbing through a sample (at usually a variable rate), at any given moment my position in the sample is x and the time (relative to something) is t. Is there a way of continuously extracting the velocity during the scrub (for use to control other parameters)? Taking it further could I extract say acceleration? Or calculate an integral of the total distance travelled during the scrub for example? Sure this is possible but age seems to have withered my math chops! Thx. IP: Logged |
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SSC Administrator |
posted 06 March 2015 11:21
In the Prototypes, there's a Pseudo Differentiator you could try for taking the derivative. And you could use the Pseudo Integrator for integrating. In K7, there is also the LossyIntegrator module. Let us know how it goes! IP: Logged |
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TazioSchiesari Member |
posted 11 March 2015 08:45
If I've read correctly your question it might be related to one I have as well, so I'll join  One of the new modules is the IndexSample (sorry if its not accurate, I'm away from Kyma right now) and when I saw it I instantly thought "Nice! An easy to perform scrub Sample" but even with a smoothed hot value parameter did not give me the expected result: tape scrub. Is there a simple work around for that? Thanks IP: Logged |
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SSC Administrator |
posted 11 March 2015 08:58
You could try putting the EventValue into a Constant, then feed the Constant into an AveragingLowPassFilter set at a 10 hz cutoff. Or you could try the new BiDiSmoother or LossyIntegrator in place of the filter. Then use that as the input to the SampleWithTimeIndex. Alternatively, you could open the sample file in the new Wave editor and create a Gallery. There is a scrub example in the Players. IP: Logged |
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TazioSchiesari Member |
posted 11 March 2015 16:17
Thanks SSC the AveragingLowPassFilter worked perfectly. Why the 10Hz? IP: Logged |
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SSC Administrator |
posted 11 March 2015 23:11
Just a very low frequency (sub audio) to ensure that it is a slowly varying control signal with no audio rate jitter in it. IP: Logged |
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ezahp Member |
posted 12 March 2015 13:03
Brilliant, thankyou, great tip du jour..... IP: Logged |
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