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Go Back   DriverHeaven.net > Forums > Hardware and Related Topics > kX Project Audio Driver Support Forum > Effects and the DSP

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Old Sep 21, 2007, 09:31 AM   #1
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Turn this Lfo into "audio frequency oscilator" for FM

This is "Kevin's LFO.da".
Where and how would I modify the code to increase it to audio rate?
Also should I modify the "edit source" or "edit dump" version?

(this is what i get when i rightclick on the .da file and select "edit".)

; Generated by kX DSP Editor - microcode dump
name "~ LFO";
copyright "Copyright (c) 2002-2003, Kevin Horden";
engine "kX";
created "29/11/2003";
guid "80a7ade9-e912-4c29-b994-639bfe97ca6d";
; Low Frequency Triangle and Square Oscilator
; For driving vib, trem, phase, chorus etc.
; Rate is scaled so 0%-100% equals 0.2 Hz to 20 Hz
; Registers
output Square
output Triangle
control Rate=0.4 ; Initial slider position is at 6.6 Hz
static tri=0.0 ; Counter for triangle wave
static dir=1.0 ; direction of wave
temp RateScaled

; Code
interp RateScaled,0.00001666666,Rate,0.0016666666 ; scale the slider control
macs tri, tri,RateScaled,dir ; increment/decrement the tri counter
skip ccr, ccr, 0x10, 0x1 ; if there is a saturation then
macsn dir, 0.0, dir, 1.0 ; flip the direction by skipping one
macsn dir, 0.0, dir, 1.0 ; inversion.
macs Triangle, 0.0, tri, 1.0 ; output the triangle wave
tstneg Square, tri, 1.0, 0.0 ; square the wave and output it.
end

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Old Sep 21, 2007, 09:56 AM   #2
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Use wavegen 3.0 - its output covers the entire frequency range of the DSP.
(sample rate of kX DSP is fixed at 48Khz... so - 20Khz is the max possible)

But I dont know how that would be used for 'FM'... ??

The stereo pilot freq I suppose.. its 19Khz. let us know how that works out for you.
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Old Sep 21, 2007, 10:21 AM   #3
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Thanks
Exactly... I tried to edit the post to change the title to remove "for FM"
should have been AM (as used with "Kevin's VCA")

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