Re: [Csnd] distortion ftable

Date	2011-06-16 21:26
From	"Partev Barr Sarkissian"
Subject	Re: [Csnd] distortion ftable
	Take a 60-hz sine wave, get some low amplitude noise (random) to ride on it, add it to the signal at a very low amplitude. Then adjust that noise amplitude to suit your taste. -Partev ============================================================== --- oyvind.brandtsegg@ntnu.no wrote: From: Oeyvind Brandtsegg To: csound@lists.bath.ac.uk Subject: Re: [Csnd] distortion ftable Date: Thu, 16 Jun 2011 17:27:30 +0200 Please try the other distortion techniques too. I haven't used distort (or probably did a long time ago, but can't remember how it sounds), but distort1 sound quite ok, lpf18 also has nice dist, and the waveshaping techniques (experiment with different shapes) and the slope based delay. Run any combination of these in parallell and/or series, combine with low pass filtering. Tube amp distortion is no simple task, and you might have to model it differently depending on your source signal and obviously also depending on your taste and your idea of tube distortion. best Oeyvind 2011/6/16 Adam Puckett : > Here's my CSD: > > > > -iadc2 -odac1 > > > sr = 44100 > ksmps = 1 > nchnls = 2 > 0dbfs = 1 > instr 1 > asig inch 1 > awsh distort asig, 1, 5 > outs awsh, awsh > endin > > > f5 0 8192 7 -.8 934 -.79 934 -.77 934 -.64 1034 -.48 520 .47 2300 .48 1536 .48 > i1 0 120 > e > > > > It doesn't sound like tube distortion. What changes do I need to make? > > On 6/16/11, Oeyvind Brandtsegg wrote: >> You're right that you don't need to normalize when you're already at >> 0dbfs=1. >> >> Is that code from Mikelson? >> Hm, I didn' check, but remember it slightly different >> >> I thought it was more like: >> >> awsh tablei asig*0.5, itable, 1, 0.5, 0 ; awsh=output, asig=input >> >> so that >> - the input signal has a range of -0.5 to +0.5 >> - 4th arg to table = 0.5: the table index is offset by 0.5 (so our >> asig lookup will be in the range 0.0 to 1.0) >> - 5th arg to table = 0: no wraparound, as that will cause >> discontinuities with the most usual transfer functions >> >> In case of doubt, you can alsways test your implementation by using a >> linear transfer function (line from -1 to +1), >> and your output signal should be exactly equal to the input signal. >> >> best >> Oeyvind >> >> 2011/6/16 Adam Puckett : >>> From this code, I can assume that by "waveshaping you mean something like: >>> >>> awsh tablei asig, itable, 1, 0, 1 ; awsh=output, asig=input >>> >>> Am I right? And what would I do for 0dbfs = 1? Seems like I wouldn't >>> need to do all this normalization because 0dbfs is already 0 to 1. >>> >>> Thanks for your help. >>> >>> Adam >>> >>> On 6/16/11, Oeyvind Brandtsegg wrote: >>>> Hello Adam, >>>> Distort1 should work nicely. >>>> >>>> You could use distort1 to generate a waveshape table, but then you >>>> could just as well use distort1 I think, as you can tweak the >>>> parameters on distort1 (but on on a wavetable). You can probably find >>>> a lot of transfer functions for different tube amps on the net. >>>> Experimenting with waveshaping is a good way to search for 'your own' >>>> distortion. >>>> >>>> Also, check out the slope based delay distortion in orchestra (instr >>>> 13 in http://www.csounds.com/mikelson/multifx.orc) >>>> >>>> best >>>> Oeyvind >>>> >>>> 2011/6/16 Adam Puckett : >>>>> Hey guys, >>>>> >>>>> I'd like to find a way to distort my guitar with Csound as if I'm >>>>> playing it with an amplifier with distortion. How can I, using the >>>>> distort opcode, make an ftable that would do this? Or could I use >>>>> distort1? >>>>> >>>>> Thanks, >>>>> >>>>> Adam >>>>> >>>>> >>>>> Send bugs reports to the Sourceforge bug tracker >>>>> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >>>>> Discussions of bugs and features can be posted here >>>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >>>>> csound" >>>>> >>>>> >>>> >>>> >>>> Send bugs reports to the Sourceforge bug tracker >>>> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >>>> Discussions of bugs and features can be posted here >>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >>>> csound" >>>> >>>> >>> >>> >>> Send bugs reports to the Sourceforge bug tracker >>> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >>> Discussions of bugs and features can be posted here >>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >>> csound" >>> >>> >> >> >> Send bugs reports to the Sourceforge bug tracker >> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >> Discussions of bugs and features can be posted here >> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >> csound" >> >> > > > Send bugs reports to the Sourceforge bug tracker > https://sourceforge.net/tracker/?group_id=81968&atid=564599 > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" > > Send bugs reports to the Sourceforge bug tracker https://sourceforge.net/tracker/?group_id=81968&atid=564599 Discussions of bugs and features can be posted here To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" _____________________________________________________________ Netscape. Just the Net You Need. Send bugs reports to the Sourceforge bug tracker https://sourceforge.net/tracker/?group_id=81968&atid=564599 Discussions of bugs and features can be posted here To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"

Date	2011-06-16 23:29
From	Adam Puckett
Subject	Re: [Csnd] distortion ftable
	OK: sr = 44100 ksmps = 1 nchnls = 1 0dbfs = 1 instr 1 asig oscil .91, 60, 1 anoise rand .03 amix = asig+anoise out amix endin f1 0 8192 10 1 i1 0 20 e This sounds a little like my amp actually. On 6/16/11, Partev Barr Sarkissian wrote: > Take a 60-hz sine wave, get some low amplitude noise (random) > to ride on it, add it to the signal at a very low amplitude. > Then adjust that noise amplitude to suit your taste. > > -Partev > > ============================================================== > > --- oyvind.brandtsegg@ntnu.no wrote: > > From: Oeyvind Brandtsegg > To: csound@lists.bath.ac.uk > Subject: Re: [Csnd] distortion ftable > Date: Thu, 16 Jun 2011 17:27:30 +0200 > > Please try the other distortion techniques too. > I haven't used distort (or probably did a long time ago, but can't > remember how it sounds), > but distort1 sound quite ok, > lpf18 also has nice dist, > and the waveshaping techniques (experiment with different shapes) > and the slope based delay. > Run any combination of these in parallell and/or series, combine with > low pass filtering. > Tube amp distortion is no simple task, and you might have to model it > differently depending on your source signal and obviously also > depending on your taste and your idea of tube distortion. > best > Oeyvind > > 2011/6/16 Adam Puckett : >> Here's my CSD: >> >> >> >> -iadc2 -odac1 >> >> >> sr = 44100 >> ksmps = 1 >> nchnls = 2 >> 0dbfs = 1 >> instr 1 >> asig inch 1 >> awsh distort asig, 1, 5 >> outs awsh, awsh >> endin >> >> >> f5 0 8192 7 -.8 934 -.79 934 -.77 934 -.64 1034 -.48 520 .47 2300 .48 1536 >> .48 >> i1 0 120 >> e >> >> >> >> It doesn't sound like tube distortion. What changes do I need to make? >> >> On 6/16/11, Oeyvind Brandtsegg wrote: >>> You're right that you don't need to normalize when you're already at >>> 0dbfs=1. >>> >>> Is that code from Mikelson? >>> Hm, I didn' check, but remember it slightly different >>> >>> I thought it was more like: >>> >>> awsh tablei asig*0.5, itable, 1, 0.5, 0 ; awsh=output, asig=input >>> >>> so that >>> - the input signal has a range of -0.5 to +0.5 >>> - 4th arg to table = 0.5: the table index is offset by 0.5 (so our >>> asig lookup will be in the range 0.0 to 1.0) >>> - 5th arg to table = 0: no wraparound, as that will cause >>> discontinuities with the most usual transfer functions >>> >>> In case of doubt, you can alsways test your implementation by using a >>> linear transfer function (line from -1 to +1), >>> and your output signal should be exactly equal to the input signal. >>> >>> best >>> Oeyvind >>> >>> 2011/6/16 Adam Puckett : >>>> From this code, I can assume that by "waveshaping you mean something >>>> like: >>>> >>>> awsh tablei asig, itable, 1, 0, 1 ; awsh=output, asig=input >>>> >>>> Am I right? And what would I do for 0dbfs = 1? Seems like I wouldn't >>>> need to do all this normalization because 0dbfs is already 0 to 1. >>>> >>>> Thanks for your help. >>>> >>>> Adam >>>> >>>> On 6/16/11, Oeyvind Brandtsegg wrote: >>>>> Hello Adam, >>>>> Distort1 should work nicely. >>>>> >>>>> You could use distort1 to generate a waveshape table, but then you >>>>> could just as well use distort1 I think, as you can tweak the >>>>> parameters on distort1 (but on on a wavetable). You can probably find >>>>> a lot of transfer functions for different tube amps on the net. >>>>> Experimenting with waveshaping is a good way to search for 'your own' >>>>> distortion. >>>>> >>>>> Also, check out the slope based delay distortion in orchestra (instr >>>>> 13 in http://www.csounds.com/mikelson/multifx.orc) >>>>> >>>>> best >>>>> Oeyvind >>>>> >>>>> 2011/6/16 Adam Puckett : >>>>>> Hey guys, >>>>>> >>>>>> I'd like to find a way to distort my guitar with Csound as if I'm >>>>>> playing it with an amplifier with distortion. How can I, using the >>>>>> distort opcode, make an ftable that would do this? Or could I use >>>>>> distort1? >>>>>> >>>>>> Thanks, >>>>>> >>>>>> Adam >>>>>> >>>>>> >>>>>> Send bugs reports to the Sourceforge bug tracker >>>>>> >>>>>> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >>>>>> Discussions of bugs and features can be posted here >>>>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body >>>>>> "unsubscribe >>>>>> csound" >>>>>> >>>>>> >>>>> >>>>> >>>>> Send bugs reports to the Sourceforge bug tracker >>>>> >>>>> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >>>>> Discussions of bugs and features can be posted here >>>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body >>>>> "unsubscribe >>>>> csound" >>>>> >>>>> >>>> >>>> >>>> Send bugs reports to the Sourceforge bug tracker >>>> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >>>> Discussions of bugs and features can be posted here >>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body >>>> "unsubscribe >>>> csound" >>>> >>>> >>> >>> >>> Send bugs reports to the Sourceforge bug tracker >>> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >>> Discussions of bugs and features can be posted here >>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >>> csound" >>> >>> >> >> >> Send bugs reports to the Sourceforge bug tracker >> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >> Discussions of bugs and features can be posted here >> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >> csound" >> >> > > > Send bugs reports to the Sourceforge bug tracker > https://sourceforge.net/tracker/?group_id=81968&atid=564599 > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe > csound" > > > > > > _____________________________________________________________ > Netscape. Just the Net You Need. > Send bugs reports to the Sourceforge bug tracker > https://sourceforge.net/tracker/?group_id=81968&atid=564599 > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe > csound" > > Send bugs reports to the Sourceforge bug tracker https://sourceforge.net/tracker/?group_id=81968&atid=564599 Discussions of bugs and features can be posted here To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"