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Author Topic:   PulseGenerator
garth paine
Member
posted 16 August 2001 05:57         Edit/Delete Message   Reply w/Quote
I am interested in geting a non-band limited square wave pulse train, which I need as an input to a DelayWithFeedback, whicb will then be fed into an inverse FFT.

I am converting some SuperCollider code into Kyma. The SC code goes:

src = CombN.ar(Impulse.ar(in.poll(in5Args), in.poll(in5Args1)), dur, dur, 3, (amp3.kr*in.poll(in3Args1)))

out = IFFT.ar(fftsize, 0, cosineTable, nil, window, src,0)

CombN(input, MaxDelay, DelayTime, DecayTime to -60db)

IFFT(size, offset, costable, inputWindow, outputWindow, realInput, imaginaryInput)

I am also wondering what the deal is with the imaginary input? I notice the Kyma manual briefly mentions it generates one automatically, but I can't see how to make that a CosineTable.

Alos I can't see how to replicate the decayTime in the CombN() in a DelayWithFeedback?

Thanks in advance for ideas. I think this is a good way to learn to use Kyma, converting something that I know the sound of.

ps. The in.poll(in5Args) etc are MIDI Pitchbend input, which I will need to map onto MIDI input, but I am using high resolution pitchbend, as I need the resolution. The controllers are realtime information from weather stations which output machine units in the range 0 - 4095.

Many things to learn and try out

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SSC
Administrator
posted 16 August 2001 09:22         Edit/Delete Message   Reply w/Quote
The prototype called PulseTrain is a non bandlimited pulse train intended for use as a control signal (PulseGenerator *is* bandlimited and is intended for audio signals).
ReverbElement is another flavor of DelayWithFeedback in which you can specify DecayTime.
For the imaginary input, just put in a Constant with zero as its value.

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