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Author Topic:   K-Rate Processing
David McClain
Member
posted 30 September 2001 12:44         Edit/Delete Message   Reply w/Quote
Hi,

Just how smart is Kyma about "K-Rate" processing when you paste a Sound into a hot-field and give it a time period using

<sound> L: 5

for, say, 5 ms intervals?

Does Kyma hold off processing some hot value source Sounds except for the 5 ms K-Rate sampling? Or does it universally continue to run the sources at A-Rate and simply sample the hot field at the chosen K-Rate?

I suspect the latter, because some Sounds need to continue processing at A-Rate no matter what, e.g., AmplitudeFollower, RMS, Delay, IIR & FIR Filters, etc. -- anything that accumulates state over time based on information at audio rates.

Other things like the WaveShapers with interpolation could reasonably run only at the K-Rate intervals and this would save a lot of DSP horsepower. These useful intermittent sounds are stateless point operations on the incoming audio stream.

- DM

[This message has been edited by David McClain (edited 30 September 2001).]

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SSC
Administrator
posted 30 September 2001 13:46         Edit/Delete Message   Reply w/Quote
Yes, the Sound computes at the sample rate, but the expression containing the Sound is computed at the rate you specify (200 hz, in your example, 1000 hz by default).

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