[CSOUND-DEV] Simple wavefolder opcode
| Date | 2015-10-17 17:02 |
| From | Peter Burgess |
| Subject | [CSOUND-DEV] Simple wavefolder opcode |
Hi, I'm trying to find or make a simple wavefolding opcode, by which I mean, if the amplitude of a sample is higher than a threshold, or lower than a -threshold, it will invert the petruduing samples around the threshold/-threshold line. I've tried knocking one up myself, but I can't use > on a-rate variables. This is what I had in mind:iwavethresh = 0.6 icps = cpsmidinn(p4) aosc oscili 0.8, icps, ifn1 if (aosc > iwavethresh) then aosc = iwavethresh - (aosc - iwavethresh) elseif (aosc < -iwavethresh) then aosc = -iwavethresh + (-aosc - iwavethresh) endif out aosc endin If ifn1 was a triangle wave with 32 elements, i would expect the first half of the output waveform of the above to look like this: 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.5, 0.4, 0.5, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1 Pete |
| Date | 2015-10-17 17:14 |
| From | jpff |
| Subject | Re: [CSOUND-DEV] Simple wavefolder opcode |
Write an udo with ksmps=1, then you can test an audio signal. Just an idea.... On Sat, 17 Oct 2015, Peter Burgess wrote: > Hi, I'm trying to find or make a simple wavefolding opcode, by which I mean, > if the amplitude of a sample is higher than a threshold, or lower than a > -threshold, it will invert the petruduing samples around the > threshold/-threshold line. > > I've tried knocking one up myself, but I can't use > on a-rate variables. This > is what I had in mind: > > instr 1 > > iwavethresh = 0.6 > > icps = cpsmidinn(p4) > > > aosc oscili 0.8, icps, ifn1 > > > if (aosc > iwavethresh) then > > aosc = iwavethresh - (aosc - iwavethresh) > > elseif (aosc < -iwavethresh) then > > aosc = -iwavethresh + (-aosc - iwavethresh) > > endif > > > out aosc > > endin > > If ifn1 was a triangle wave with 32 elements, i would expect the first half of > the output waveform of the above to look like this: > > 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.5, 0.4, 0.5, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1 > > Pete > > |
| Date | 2015-10-17 17:18 |
| From | jpff |
| Subject | Re: [CSOUND-DEV] Simple wavefolder opcode |
or does the moirror opcode do what you want? On Sat, 17 Oct 2015, Peter Burgess wrote: > Hi, I'm trying to find or make a simple wavefolding opcode, by which I mean, > if the amplitude of a sample is higher than a threshold, or lower than a > -threshold, it will invert the petruduing samples around the > threshold/-threshold line. > > I've tried knocking one up myself, but I can't use > on a-rate variables. This > is what I had in mind: > > instr 1 > > iwavethresh = 0.6 > > icps = cpsmidinn(p4) > > > aosc oscili 0.8, icps, ifn1 > > > if (aosc > iwavethresh) then > > aosc = iwavethresh - (aosc - iwavethresh) > > elseif (aosc < -iwavethresh) then > > aosc = -iwavethresh + (-aosc - iwavethresh) > > endif > > > out aosc > > endin > > If ifn1 was a triangle wave with 32 elements, i would expect the first half of > the output waveform of the above to look like this: > > 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.5, 0.4, 0.5, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1 > > Pete > > |
| Date | 2015-10-17 17:25 |
| From | Peter Burgess |
| Subject | Re: [CSOUND-DEV] Simple wavefolder opcode |
That's the biscuit! Mirror's my man. Cheers john! On Sat, Oct 17, 2015 at 5:18 PM, jpff <jpff@codemist.co.uk> wrote: or does the moirror opcode do what you want? |