[Csnd] accelerando

[Csnd] accelerando

Date	2013-03-24 08:11
From	Stefan Thomas
Subject	[Csnd] accelerando
	Dear community, if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 in e.g. 5 notes, how could I do that in a musically way, or, what could be a formula for that?

Date	2013-03-24 12:32
From	Richard Dobson
Subject	Re: [Csnd] accelerando
	On 24/03/2013 08:11, Stefan Thomas wrote: > Dear community, > if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 > in e.g. 5 notes, how could I do that in a musically way, or, what could > be a formula for that? Have you tried the score tempo statement? You can specify time-stamped changes. Richard Dobson

Date	2013-03-24 13:03
From	jpff@cs.bath.ac.uk
Subject	Re: [Csnd] accelerando
	Are you asking whether an accelerando should be linear or exponential? > On 24/03/2013 08:11, Stefan Thomas wrote: >> Dear community, >> if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 >> in e.g. 5 notes, how could I do that in a musically way, or, what could >> be a formula for that? > > Have you tried the score tempo statement? You can specify time-stamped > changes. > > Richard Dobson > > > > 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	2013-03-24 15:35
From	Stefan Thomas
Subject	Re: [Csnd] accelerando
	The tempo-statement, I guess, can't be used, when I want to use different accelerandos in different voices. I would like to use exponential acellerandos. 2013/3/24 Richard Dobson <richarddobson@blueyonder.co.uk> On 24/03/2013 08:11, Stefan Thomas wrote: Dear community, if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 in e.g. 5 notes, how could I do that in a musically way, or, what could be a formula for that? Have you tried the score tempo statement? You can specify time-stamped changes. Richard Dobson 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	2013-03-24 16:08
From	Ruben Sverre Gjertsen
Subject	Re: [Csnd] accelerando
	If you use Open Music to generate the scores, you can calculate accelerando curves there, then export with the OM2Csound library. I find that the easiest. Ruben Den 24. mars 2013 kl. 16.35 skrev Stefan Thomas: The tempo-statement, I guess, can't be used, when I want to use different accelerandos in different voices. I would like to use exponential acellerandos. 2013/3/24 Richard Dobson <richarddobson@blueyonder.co.uk> On 24/03/2013 08:11, Stefan Thomas wrote: Dear community, if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 in e.g. 5 notes, how could I do that in a musically way, or, what could be a formula for that? Have you tried the score tempo statement? You can specify time-stamped changes. Richard Dobson 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	2013-03-24 18:02
From	Tarmo Johannes
Subject	Re: [Csnd] accelerando
	Calculating accelerando of tempo to time intervals in seconds is a bit complicated matter but there have been some discussion about it in the list: http://csound.1045644.n5.nabble.com/The-math-behind-gradual-tempo-changes-td3350632.html http://csound.1045644.n5.nabble.com/Calculating-Seconds-to-Beats-in-TimeWarp-td1098542.html from the latter thead have look to the formulas by Istvan Varga in his attached files timeconv.txt and the accompaning python files hope it helps further. best! tarmo -------- copy of the text file: beat: time in beats time: time in seconds tempo: beats per minute btime: 60 / tempo beat0: time in beats at beginning of segment beat1: time in beats at end of segment time0: time in seconds at beginning of segment time1: time in seconds at end of segment btime0: (60 / tempo) at beginning of segment btime1: (60 / tempo) at end of segment ======================================================================== BEAT => TIME x = beat - beat0 btime(x) = btime0 + ((btime1 - btime0) * x / (beat1 - beat0)) time(x) = time0 + (btime0 * x) + (0.5 * (btime1 - btime0) * x * x / (beat1 - beat0)) ======================================================================== TIME => BEAT a = 0.5 * (btime1 - btime0) / (beat1 - beat0) b = btime0 c = time0 - time x = (sqrt(bb - 4ac) - b) / (2 a) beat = x + beat0 On Sunday 24 March 2013 17:08:20 Ruben Sverre Gjertsen wrote: If you use Open Music to generate the scores, you can calculate accelerando curves there, then export with the OM2Csound library. I find that the easiest. Ruben Den 24. mars 2013 kl. 16.35 skrev Stefan Thomas: The tempo-statement, I guess, can't be used, when I want to use different accelerandos in different voices. I would like to use exponential acellerandos. 2013/3/24 Richard Dobson <richarddobson@blueyonder.co.uk> On 24/03/2013 08:11, Stefan Thomas wrote: Dear community, if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 in e.g. 5 notes, how could I do that in a musically way, or, what could be a formula for that? Have you tried the score tempo statement? You can specify time-stamped changes. Richard Dobson 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	2013-03-24 19:38
From	Stefan Thomas
Subject	Re: [Csnd] accelerando
	Dear Tarmo, thanks for the script. I don't know, what to do with the tempo-parameter in the python scripts. How can I do e.g. an strong accelerando from beat 0 to beat 2 in e.g. 4 steps? I would like to calculate when the single notes start. 2013/3/24 Tarmo Johannes <tarmo.johannes@otsakool.edu.ee> Calculating accelerando of tempo to time intervals in seconds is a bit complicated matter but there have been some discussion about it in the list: http://csound.1045644.n5.nabble.com/The-math-behind-gradual-tempo-changes-td3350632.html http://csound.1045644.n5.nabble.com/Calculating-Seconds-to-Beats-in-TimeWarp-td1098542.html from the latter thead have look to the formulas by Istvan Varga in his attached files timeconv.txt and the accompaning python files hope it helps further. best! tarmo -------- copy of the text file: beat: time in beats time: time in seconds tempo: beats per minute btime: 60 / tempo beat0: time in beats at beginning of segment beat1: time in beats at end of segment time0: time in seconds at beginning of segment time1: time in seconds at end of segment btime0: (60 / tempo) at beginning of segment btime1: (60 / tempo) at end of segment ======================================================================== BEAT => TIME x = beat - beat0 btime(x) = btime0 + ((btime1 - btime0) * x / (beat1 - beat0)) time(x) = time0 + (btime0 * x) + (0.5 * (btime1 - btime0) * x * x / (beat1 - beat0)) ======================================================================== TIME => BEAT a = 0.5 * (btime1 - btime0) / (beat1 - beat0) b = btime0 c = time0 - time x = (sqrt(bb - 4ac) - b) / (2 a) beat = x + beat0 On Sunday 24 March 2013 17:08:20 Ruben Sverre Gjertsen wrote: If you use Open Music to generate the scores, you can calculate accelerando curves there, then export with the OM2Csound library. I find that the easiest. Ruben Den 24. mars 2013 kl. 16.35 skrev Stefan Thomas: The tempo-statement, I guess, can't be used, when I want to use different accelerandos in different voices. I would like to use exponential acellerandos. 2013/3/24 Richard Dobson <richarddobson@blueyonder.co.uk> On 24/03/2013 08:11, Stefan Thomas wrote: Dear community, if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 in e.g. 5 notes, how could I do that in a musically way, or, what could be a formula for that? Have you tried the score tempo statement? You can specify time-stamped changes. Richard Dobson 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	2013-03-24 19:59
From	Ruben Sverre Gjertsen
Subject	Re: [Csnd] accelerando
	Hi, I have an Open Music function that does this, called time-scaler: http://www.bek.no/~ruben/Research/Downloads/software.html It's a bit complicated to write a simple formula with the recursion, but it works. Inputs are: List of chordseqs Scaling factor MinMax, ex. (.5 1) bpf tempo curve Resolution, ex. 1000 Output: List of chordseqs An accelerando split in 1000 or 10000 intervals would be quite smooth. This would be better for the Open Music forum though. Best Ruben Den 24. mars 2013 kl. 20.38 skrev Stefan Thomas: Dear Tarmo, thanks for the script. I don't know, what to do with the tempo-parameter in the python scripts. How can I do e.g. an strong accelerando from beat 0 to beat 2 in e.g. 4 steps? I would like to calculate when the single notes start. 2013/3/24 Tarmo Johannes <tarmo.johannes@otsakool.edu.ee> Calculating accelerando of tempo to time intervals in seconds is a bit complicated matter but there have been some discussion about it in the list: http://csound.1045644.n5.nabble.com/The-math-behind-gradual-tempo-changes-td3350632.html http://csound.1045644.n5.nabble.com/Calculating-Seconds-to-Beats-in-TimeWarp-td1098542.html from the latter thead have look to the formulas by Istvan Varga in his attached files timeconv.txt and the accompaning python files hope it helps further. best! tarmo -------- copy of the text file: beat: time in beats time: time in seconds tempo: beats per minute btime: 60 / tempo beat0: time in beats at beginning of segment beat1: time in beats at end of segment time0: time in seconds at beginning of segment time1: time in seconds at end of segment btime0: (60 / tempo) at beginning of segment btime1: (60 / tempo) at end of segment ======================================================================== BEAT => TIME x = beat - beat0 btime(x) = btime0 + ((btime1 - btime0) * x / (beat1 - beat0)) time(x) = time0 + (btime0 * x) + (0.5 * (btime1 - btime0) * x * x / (beat1 - beat0)) ======================================================================== TIME => BEAT a = 0.5 * (btime1 - btime0) / (beat1 - beat0) b = btime0 c = time0 - time x = (sqrt(bb - 4ac) - b) / (2 a) beat = x + beat0 On Sunday 24 March 2013 17:08:20 Ruben Sverre Gjertsen wrote: If you use Open Music to generate the scores, you can calculate accelerando curves there, then export with the OM2Csound library. I find that the easiest. Ruben Den 24. mars 2013 kl. 16.35 skrev Stefan Thomas: The tempo-statement, I guess, can't be used, when I want to use different accelerandos in different voices. I would like to use exponential acellerandos. 2013/3/24 Richard Dobson <richarddobson@blueyonder.co.uk> On 24/03/2013 08:11, Stefan Thomas wrote: Dear community, if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 in e.g. 5 notes, how could I do that in a musically way, or, what could be a formula for that? Have you tried the score tempo statement? You can specify time-stamped changes. Richard Dobson 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	2013-03-24 20:00
From	Stefan Thomas
Subject	Re: [Csnd] accelerando
	Dear Ruben, looks interesting, thanks! 2013/3/24 Ruben Sverre Gjertsen <ruben.gjertsen@grieg.uib.no> Hi, I have an Open Music function that does this, called time-scaler: http://www.bek.no/~ruben/Research/Downloads/software.html It's a bit complicated to write a simple formula with the recursion, but it works. Inputs are: List of chordseqs Scaling factor MinMax, ex. (.5 1) bpf tempo curve Resolution, ex. 1000 Output: List of chordseqs An accelerando split in 1000 or 10000 intervals would be quite smooth. This would be better for the Open Music forum though. Best Ruben Den 24. mars 2013 kl. 20.38 skrev Stefan Thomas: Dear Tarmo, thanks for the script. I don't know, what to do with the tempo-parameter in the python scripts. How can I do e.g. an strong accelerando from beat 0 to beat 2 in e.g. 4 steps? I would like to calculate when the single notes start. 2013/3/24 Tarmo Johannes <tarmo.johannes@otsakool.edu.ee> Calculating accelerando of tempo to time intervals in seconds is a bit complicated matter but there have been some discussion about it in the list: http://csound.1045644.n5.nabble.com/The-math-behind-gradual-tempo-changes-td3350632.html http://csound.1045644.n5.nabble.com/Calculating-Seconds-to-Beats-in-TimeWarp-td1098542.html from the latter thead have look to the formulas by Istvan Varga in his attached files timeconv.txt and the accompaning python files hope it helps further. best! tarmo -------- copy of the text file: beat: time in beats time: time in seconds tempo: beats per minute btime: 60 / tempo beat0: time in beats at beginning of segment beat1: time in beats at end of segment time0: time in seconds at beginning of segment time1: time in seconds at end of segment btime0: (60 / tempo) at beginning of segment btime1: (60 / tempo) at end of segment ======================================================================== BEAT => TIME x = beat - beat0 btime(x) = btime0 + ((btime1 - btime0) * x / (beat1 - beat0)) time(x) = time0 + (btime0 * x) + (0.5 * (btime1 - btime0) * x * x / (beat1 - beat0)) ======================================================================== TIME => BEAT a = 0.5 * (btime1 - btime0) / (beat1 - beat0) b = btime0 c = time0 - time x = (sqrt(bb - 4ac) - b) / (2 a) beat = x + beat0 On Sunday 24 March 2013 17:08:20 Ruben Sverre Gjertsen wrote: If you use Open Music to generate the scores, you can calculate accelerando curves there, then export with the OM2Csound library. I find that the easiest. Ruben Den 24. mars 2013 kl. 16.35 skrev Stefan Thomas: The tempo-statement, I guess, can't be used, when I want to use different accelerandos in different voices. I would like to use exponential acellerandos. 2013/3/24 Richard Dobson <richarddobson@blueyonder.co.uk> On 24/03/2013 08:11, Stefan Thomas wrote: Dear community, if I would like to create a acellerando, starting from e.g. p3=0 to p3=1 in e.g. 5 notes, how could I do that in a musically way, or, what could be a formula for that? Have you tried the score tempo statement? You can specify time-stamped changes. Richard Dobson 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"