Global Variables reinitialisation - Yet Another Newb Question !
| Date | 2005-12-07 18:12 |
| From | Nicolas =?iso-8859-1?Q?Castagn=E9?= |
| Subject | Global Variables reinitialisation - Yet Another Newb Question ! |
Hi all, yet another 'newbee', though precise, question. Let's define a global echo instrument such as : instr 198 ; GLOBAL ECHO idur = p3 itime = p4 iloop = p5 kenv linen 1, .01, idur, .01 acomb comb gacmb, itime, iloop, 0 out acomb*kenv gacmb =0 endin This instrument work with the global variable gacmb. Now, let's create various copies of this instrument in the score : ;ins strt dur time loopt i 198 0 6 10 .8 i 198 0 6 10 .3 i 198 0 6 10 .3 What happens when these multiple instances run in parallel ? A possible behavior would be : When the a-rate instruction : gacmb =0 is executed in the first instance of the instrument, then the global variable gacmb is set to Zero. Consequently, the other instances of the instrument would process a Null signal !! MMmhhhhh... Let me guess... This is not the CSound behavior in that case. Possibly, the multiple instances are executed 'in parallel', Opcode per Opcode... But I am not sure at all ! I red carefully the CSound program flow http://www.csounds.com/internals/index.html but did not find the answer... I would be grateful if someone could tell me a bit more about : - how CSound behaves in that case - why he behaves so (how it is implemented) Thx much in advance ! (and for answers to my past questions) Nicolas PS : as you may have seen, my 'example' is coming from Dr Boulanger's first chapter of the CSound Book : http://www.csounds.com/chapter1/index.html Indeed, it corresponds with instrument 137 in this chapter : http://www.csounds.com/chapter1/instruments/01/137/137.html http://www.csounds.com/chapter1/instruments/01/137.sco -- ------------------------------------------------------------------- Dr Nicolas CASTAGNE ACROE-ICA, 46 av. Félix Viallet 38 000 Grenoble http://acroe.imag.fr Tel : (33) 4 76 57 46 60 ------------------------------------------------------------------- |
| Date | 2005-12-08 09:48 |
| From | Victor Lazzarini |
| Subject | Re: Global Variables reinitialisation - Yet Another Newb Question ! |
I'm not really sure what you said is right. I just did a test here using gk1 init 0 instr 1 gk1 = 1 endin instr 2 k1 = p4 printk 1, gk1 printk 1, k1 gk1 = 0; endin and i1 0 10 i2 0 10 1 i2 0 10 2 The printout goes like: i 2 time 0.00023: 1.00000 i 2 time 0.00023: 1.00000 i 2 time 0.00023: 0.00000 <--- i 2 time 0.00023: 2.00000 <--- i 2 time 1.00000: 1.00000 i 2 time 1.00000: 1.00000 i 2 time 1.00000: 0.00000 <--- i 2 time 1.00000: 2.00000 <--- So you can see that the second instance of the instrument (marked with <---) actually runs after the first and gk1 is set to 0 I have not tested your example, but I will do. Victor At 18:12 07/12/2005, you wrote: >Hi all, > >yet another 'newbee', though precise, question. > > >Let's define a global echo instrument such as : > > instr 198 ; GLOBAL ECHO >idur = p3 >itime = p4 >iloop = p5 >kenv linen 1, .01, idur, .01 >acomb comb gacmb, itime, iloop, 0 > >out acomb*kenv >gacmb =0 > endin > > >This instrument work with the global variable gacmb. > > > >Now, let's create various copies of this instrument in the score : > >;ins strt dur time loopt >i 198 0 6 10 .8 >i 198 0 6 10 .3 >i 198 0 6 10 .3 > > > > >What happens when these multiple instances run in parallel ? > > > >A possible behavior would be : >When the a-rate instruction : > gacmb =0 >is executed in the first instance of the instrument, then the global >variable gacmb is set to Zero. > >Consequently, the other instances of the instrument would process a Null >signal !! > >MMmhhhhh... Let me guess... This is not the CSound behavior in that case. > >Possibly, the multiple instances are executed 'in parallel', Opcode per >Opcode... But I am not sure at all ! > > >I red carefully the CSound program flow >http://www.csounds.com/internals/index.html but did not find the answer... > > >I would be grateful if someone could tell me a bit more about : >- how CSound behaves in that case >- why he behaves so (how it is implemented) > > >Thx much in advance ! >(and for answers to my past questions) > >Nicolas > > >PS : as you may have seen, my 'example' is coming from Dr Boulanger's >first chapter of the CSound Book : >http://www.csounds.com/chapter1/index.html > >Indeed, it corresponds with instrument 137 in this chapter : >http://www.csounds.com/chapter1/instruments/01/137/137.html >http://www.csounds.com/chapter1/instruments/01/137.sco > > > >-- >------------------------------------------------------------------- >Dr Nicolas CASTAGNE > >ACROE-ICA, >46 av. Félix Viallet >38 000 Grenoble >http://acroe.imag.fr > >Tel : (33) 4 76 57 46 60 >------------------------------------------------------------------- >-- >Send bugs reports to this list. >To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk Victor Lazzarini Music Technology Laboratory Music Department National University of Ireland, Maynooth |
| Date | 2005-12-08 10:06 |
| From | Victor Lazzarini |
| Subject | Re: Global Variables reinitialisation - Yet Another Newb Question ! |
Just tested your example and I only get a single
output, as predicted.
instr 3
gacmb rand 10000
endin
instr 199 ; GLOBAL ECHO
idur = p3
itime = p4
iloop = p5
kenv linen 1, .01, idur, .01
acomb comb gacmb, itime, iloop, 0
out acomb*kenv
gacmb =0
endin
with
i3 0 0.05
i 198 0 6 10 .8
i 198 0 6 10 .3
i 198 0 6 10 .3
In fact if gacmb=0 from instr 198 is removed and
instr 200
gacmb = 0
endin
Then all three instances output sound, as predicted,
again.
Victor
At 18:12 07/12/2005, you wrote:
>Hi all,
>
>yet another 'newbee', though precise, question.
>
>
>Let's define a global echo instrument such as :
>
> instr 198 ; GLOBAL ECHO
>idur = p3
>itime = p4
>iloop = p5
>kenv linen 1, .01, idur, .01
>acomb comb gacmb, itime, iloop, 0
>
>out acomb*kenv
>gacmb =0
> endin
>
>
>This instrument work with the global variable gacmb.
>
>
>
>Now, let's create various copies of this instrument in the score :
>
>;ins strt dur time loopt
>i 198 0 6 10 .8
>i 198 0 6 10 .3
>i 198 0 6 10 .3
>
>
>
>
>What happens when these multiple instances run in parallel ?
>
>
>
>A possible behavior would be :
>When the a-rate instruction :
> gacmb =0
>is executed in the first instance of the instrument, then the global
>variable gacmb is set to Zero.
>
>Consequently, the other instances of the instrument would process a Null
>signal !!
>
>MMmhhhhh... Let me guess... This is not the CSound behavior in that case.
>
>Possibly, the multiple instances are executed 'in parallel', Opcode per
>Opcode... But I am not sure at all !
>
>
>I red carefully the CSound program flow
>http://www.csounds.com/internals/index.html but did not find the answer...
>
>
>I would be grateful if someone could tell me a bit more about :
>- how CSound behaves in that case
>- why he behaves so (how it is implemented)
>
>
>Thx much in advance !
>(and for answers to my past questions)
>
>Nicolas
>
>
>PS : as you may have seen, my 'example' is coming from Dr Boulanger's
>first chapter of the CSound Book :
>http://www.csounds.com/chapter1/index.html
>
>Indeed, it corresponds with instrument 137 in this chapter :
>http://www.csounds.com/chapter1/instruments/01/137/137.html
>http://www.csounds.com/chapter1/instruments/01/137.sco
>
>
>
>--
>-------------------------------------------------------------------
>Dr Nicolas CASTAGNE
>
>ACROE-ICA,
>46 av. Félix Viallet
>38 000 Grenoble
>http://acroe.imag.fr
>
>Tel : (33) 4 76 57 46 60
>-------------------------------------------------------------------
>--
>Send bugs reports to this list.
>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk
Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth |
| Date | 2005-12-08 10:30 |
| From | Nicolas =?iso-8859-1?Q?Castagn=E9?= |
| Subject | Re: Global Variables reinitialisation - Yet Another Newb Question ! |
Hi Victor, Thx for your answer, which confirms my analysis ! Indeed, the example is taken from Dr Boulanger's first chapter of the CSound Book. I may write to him about this, I guess... Anyhow, there is something a bit strange with Dr Boulanger's example. When hearing the latest 'notes' of the instrument/score #137, on time=46 secondes, http://www.csounds.com/chapter1/instruments/01/137/137.html http://www.csounds.com/chapter1/instruments/01/137.sco I hear quite clearly a 'multiple-rate echo' as intended in the score (through multiple instances of instruments #198)... This does not match with what you found ! Should I change my hears ? :) Or is there something weard ? All the best, Nicolas >Just tested your example and I only get a single >output, as predicted. > >instr 3 > >gacmb rand 10000 > >endin > > instr 199 ; GLOBAL ECHO >idur = p3 >itime = p4 >iloop = p5 >kenv linen 1, .01, idur, .01 >acomb comb gacmb, itime, iloop, 0 > > >out acomb*kenv >gacmb =0 > endin > >with > >i3 0 0.05 >i 198 0 6 10 .8 >i 198 0 6 10 .3 >i 198 0 6 10 .3 > > >In fact if gacmb=0 from instr 198 is removed and > >instr 200 > >gacmb = 0 > >endin > >Then all three instances output sound, as predicted, >again. > >Victor > >At 18:12 07/12/2005, you wrote: >>Hi all, >> >>yet another 'newbee', though precise, question. >> >> >>Let's define a global echo instrument such as : >> >> instr 198 ; GLOBAL ECHO >>idur = p3 >>itime = p4 >>iloop = p5 >>kenv linen 1, .01, idur, .01 >>acomb comb gacmb, itime, iloop, 0 >> >>out acomb*kenv >>gacmb =0 >> endin >> >> >>This instrument work with the global variable gacmb. >> >> >> >>Now, let's create various copies of this instrument in the score : >> >>;ins strt dur time loopt >>i 198 0 6 10 .8 >>i 198 0 6 10 .3 >>i 198 0 6 10 .3 >> >> >> >> >>What happens when these multiple instances run in parallel ? >> >> >> >>A possible behavior would be : >>When the a-rate instruction : >> gacmb =0 >>is executed in the first instance of the >>instrument, then the global variable gacmb is >>set to Zero. >> >>Consequently, the other instances of the >>instrument would process a Null signal !! >> >>MMmhhhhh... Let me guess... This is not the CSound behavior in that case. >> >>Possibly, the multiple instances are executed >>'in parallel', Opcode per Opcode... But I am >>not sure at all ! >> >> >>I red carefully the CSound program flow >>http://www.csounds.com/internals/index.html but >>did not find the answer... >> >> >>I would be grateful if someone could tell me a bit more about : >>- how CSound behaves in that case >>- why he behaves so (how it is implemented) >> >> >>Thx much in advance ! >>(and for answers to my past questions) >> >>Nicolas >> >> >>PS : as you may have seen, my 'example' is >>coming from Dr Boulanger's first chapter of the >>CSound Book : >>http://www.csounds.com/chapter1/index.html >> >>Indeed, it corresponds with instrument 137 in this chapter : >>http://www.csounds.com/chapter1/instruments/01/137/137.html >>http://www.csounds.com/chapter1/instruments/01/137.sco >> >> >> >>-- >>------------------------------------------------------------------- >>Dr Nicolas CASTAGNE >> >>ACROE-ICA, >>46 av. Félix Viallet >>38 000 Grenoble >>http://acroe.imag.fr >> >>Tel : (33) 4 76 57 46 60 >>------------------------------------------------------------------- >>-- >>Send bugs reports to this list. >>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk > >Victor Lazzarini >Music Technology Laboratory >Music Department >National University of Ireland, Maynooth >-- >Send bugs reports to this list. >To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk -- ------------------------------------------------------------------- Dr Nicolas CASTAGNE ACROE-ICA, 46 av. Félix Viallet 38 000 Grenoble http://acroe.imag.fr Tel : (33) 4 76 57 46 60 ------------------------------------------------------------------- |
| Date | 2005-12-08 10:41 |
| From | Victor Lazzarini |
| Subject | Re: Global Variables reinitialisation - Yet Another Newb Question ! |
I don't understand. What happens when you run my example? You should hear just a single repeating echo every 0.8 s. If you take out the gacmb=0 line and add it to another higher-number instrument, then you have your multi-rate echoes. If that is not the case, there might a bug in your version of csound. If in doubt, change comb for delay and check for how many echoes you get. There should be only one if you zero the global variable in the instrument. That should be the case for any orc/sco of the kind. Victor At 10:30 08/12/2005, you wrote: >Hi Victor, > >Thx for your answer, which confirms my analysis ! > >Indeed, the example is taken from Dr Boulanger's first chapter of the >CSound Book. > >I may write to him about this, I guess... > >Anyhow, there is something a bit strange with Dr Boulanger's example. > >When hearing the latest 'notes' of the instrument/score #137, on time=46 >secondes, >http://www.csounds.com/chapter1/instruments/01/137/137.html >http://www.csounds.com/chapter1/instruments/01/137.sco > >I hear quite clearly a 'multiple-rate echo' as intended in the score >(through multiple instances of instruments #198)... >This does not match with what you found ! > >Should I change my hears ? :) >Or is there something weard ? > >All the best, >Nicolas > >>Just tested your example and I only get a single >>output, as predicted. >> >>instr 3 >> >>gacmb rand 10000 >> >>endin >> >> instr 199 ; GLOBAL ECHO >>idur = p3 >>itime = p4 >>iloop = p5 >>kenv linen 1, .01, idur, .01 >>acomb comb gacmb, itime, iloop, 0 >> >> >>out acomb*kenv >>gacmb =0 >> endin >> >>with >> >>i3 0 0.05 >>i 198 0 6 10 .8 >>i 198 0 6 10 .3 >>i 198 0 6 10 .3 >> >> >>In fact if gacmb=0 from instr 198 is removed and >> >>instr 200 >> >>gacmb = 0 >> >>endin >> >>Then all three instances output sound, as predicted, >>again. >> >>Victor >> >>At 18:12 07/12/2005, you wrote: >>>Hi all, >>> >>>yet another 'newbee', though precise, question. >>> >>> >>>Let's define a global echo instrument such as : >>> >>> instr 198 ; GLOBAL ECHO >>>idur = p3 >>>itime = p4 >>>iloop = p5 >>>kenv linen 1, .01, idur, .01 >>>acomb comb gacmb, itime, iloop, 0 >>> >>>out acomb*kenv >>>gacmb =0 >>> endin >>> >>> >>>This instrument work with the global variable gacmb. >>> >>> >>> >>>Now, let's create various copies of this instrument in the score : >>> >>>;ins strt dur time loopt >>>i 198 0 6 10 .8 >>>i 198 0 6 10 .3 >>>i 198 0 6 10 .3 >>> >>> >>> >>> >>>What happens when these multiple instances run in parallel ? >>> >>> >>> >>>A possible behavior would be : >>>When the a-rate instruction : >>> gacmb =0 >>>is executed in the first instance of the instrument, then the global >>>variable gacmb is set to Zero. >>> >>>Consequently, the other instances of the instrument would process a Null >>>signal !! >>> >>>MMmhhhhh... Let me guess... This is not the CSound behavior in that case. >>> >>>Possibly, the multiple instances are executed 'in parallel', Opcode per >>>Opcode... But I am not sure at all ! >>> >>> >>>I red carefully the CSound program flow >>>http://www.csounds.com/internals/index.html but did not find the answer... >>> >>> >>>I would be grateful if someone could tell me a bit more about : >>>- how CSound behaves in that case >>>- why he behaves so (how it is implemented) >>> >>> >>>Thx much in advance ! >>>(and for answers to my past questions) >>> >>>Nicolas >>> >>> >>>PS : as you may have seen, my 'example' is coming from Dr Boulanger's >>>first chapter of the CSound Book : >>>http://www.csounds.com/chapter1/index.html >>> >>>Indeed, it corresponds with instrument 137 in this chapter : >>>http://www.csounds.com/chapter1/instruments/01/137/137.html >>>http://www.csounds.com/chapter1/instruments/01/137.sco >>> >>> >>> >>>-- >>>------------------------------------------------------------------- >>>Dr Nicolas CASTAGNE >>> >>>ACROE-ICA, >>>46 av. Félix Viallet >>>38 000 Grenoble >>>http://acroe.imag.fr >>> >>>Tel : (33) 4 76 57 46 60 >>>------------------------------------------------------------------- >>>-- >>>Send bugs reports to this list. >>>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk >> >>Victor Lazzarini >>Music Technology Laboratory >>Music Department >>National University of Ireland, Maynooth >>-- >>Send bugs reports to this list. >>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk > > >-- >------------------------------------------------------------------- >Dr Nicolas CASTAGNE > >ACROE-ICA, >46 av. Félix Viallet >38 000 Grenoble >http://acroe.imag.fr > >Tel : (33) 4 76 57 46 60 >------------------------------------------------------------------- >-- >Send bugs reports to this list. >To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk Victor Lazzarini Music Technology Laboratory Music Department National University of Ireland, Maynooth |
| Date | 2005-12-08 10:57 |
| From | Nicolas =?iso-8859-1?Q?Castagn=E9?= |
| Subject | Re: Global Variables reinitialisation - Yet Another Newb Question ! |
Hi Victor, Unfortunately, I have no CSound available this morning... Let me explain a bit more the **new question**. I am convinced that your analysis (which corresponds to mine) is correct. And quite sure runing your example on my CSound (tomorrow...) will produce the same result. And I completely agree with your solution (introducing an instrument #200). My **new question** relates not to your example, but to Pr Boulanger's examples 137/198/199, ch 1 CSound Book, on the page : http://www.csounds.com/chapter1/instruments/01/137/137.html http://www.csounds.com/chapter1/instruments/01/137.sco Have a look at the latest notes of this score, t=46seconds, then hear the latest notes of the mp3 sound on http://www.csounds.com/chapter1/instruments/01/137/137.html Well... I myself hear a multiple-rate echo on this latest note of Pr Boulanger's example.... Which contradicts your example, and our analysis... Consequently, I wonder how Pr Boulanger's example can work correctly ! Anyhow, I may write to Pr Boulanger now ;) Thx much NC >I don't understand. What happens when you run my example? You >should hear just a single repeating echo every 0.8 s. If you take out >the gacmb=0 line and add it to another higher-number instrument, then >you have your multi-rate echoes. If that is not the case, there might a >bug in your version of csound. If in doubt, change comb for delay and >check for how many echoes you get. There should be only one if >you zero the global variable in the instrument. > >That should be the case for any orc/sco of the kind. > > > >Victor > >At 10:30 08/12/2005, you wrote: >>Hi Victor, >> >>Thx for your answer, which confirms my analysis ! >> >>Indeed, the example is taken from Dr >>Boulanger's first chapter of the CSound Book. >> >>I may write to him about this, I guess... >> >>Anyhow, there is something a bit strange with Dr Boulanger's example. >> >>When hearing the latest 'notes' of the >>instrument/score #137, on time=46 secondes, >>http://www.csounds.com/chapter1/instruments/01/137/137.html >>http://www.csounds.com/chapter1/instruments/01/137.sco >> >>I hear quite clearly a 'multiple-rate echo' as >>intended in the score (through multiple >>instances of instruments #198)... >>This does not match with what you found ! >> >>Should I change my hears ? :) >>Or is there something weard ? >> >>All the best, >>Nicolas >> >>>Just tested your example and I only get a single >>>output, as predicted. >>> >>>instr 3 >>> >>>gacmb rand 10000 >>> >>>endin >>> >>> instr 199 ; GLOBAL ECHO >>>idur = p3 >>>itime = p4 >>>iloop = p5 >>>kenv linen 1, .01, idur, .01 >>>acomb comb gacmb, itime, iloop, 0 >>> >>> >>>out acomb*kenv >>>gacmb =0 >>> endin >>> >>>with >>> >>>i3 0 0.05 >>>i 198 0 6 10 .8 >>>i 198 0 6 10 .3 >>>i 198 0 6 10 .3 >>> >>> >>>In fact if gacmb=0 from instr 198 is removed and >>> >>>instr 200 >>> >>>gacmb = 0 >>> >>>endin >>> >>>Then all three instances output sound, as predicted, >>>again. >>> >>>Victor >>> >>>At 18:12 07/12/2005, you wrote: >>>>Hi all, >>>> >>>>yet another 'newbee', though precise, question. >>>> >>>> >>>>Let's define a global echo instrument such as : >>>> >>>> instr 198 ; GLOBAL ECHO >>>>idur = p3 >>>>itime = p4 >>>>iloop = p5 >>>>kenv linen 1, .01, idur, .01 >>>>acomb comb gacmb, itime, iloop, 0 >>>> >>>>out acomb*kenv >>>>gacmb =0 >>>> endin >>>> >>>> >>>>This instrument work with the global variable gacmb. >>>> >>>> >>>> >>>>Now, let's create various copies of this instrument in the score : >>>> >>>>;ins strt dur time loopt >>>>i 198 0 6 10 .8 >>>>i 198 0 6 10 .3 >>>>i 198 0 6 10 .3 >>>> >>>> >>>> >>>> >>>>What happens when these multiple instances run in parallel ? >>>> >>>> >>>> >>>>A possible behavior would be : >>>>When the a-rate instruction : >>>> gacmb =0 >>>>is executed in the first instance of the >>>>instrument, then the global variable gacmb is >>>>set to Zero. >>>> >>>>Consequently, the other instances of the >>>>instrument would process a Null signal !! >>>> >>>>MMmhhhhh... Let me guess... This is not the CSound behavior in that case. >>>> >>>>Possibly, the multiple instances are executed >>>>'in parallel', Opcode per Opcode... But I am >>>>not sure at all ! >>>> >>>> >>>>I red carefully the CSound program flow >>>>http://www.csounds.com/internals/index.html >>>>but did not find the answer... >>>> >>>> >>>>I would be grateful if someone could tell me a bit more about : >>>>- how CSound behaves in that case >>>>- why he behaves so (how it is implemented) >>>> >>>> >>>>Thx much in advance ! >>>>(and for answers to my past questions) >>>> >>>>Nicolas >>>> >>>> >>>>PS : as you may have seen, my 'example' is >>>>coming from Dr Boulanger's first chapter of >>>>the CSound Book : >>>>http://www.csounds.com/chapter1/index.html >>>> >>>>Indeed, it corresponds with instrument 137 in this chapter : >>>>http://www.csounds.com/chapter1/instruments/01/137/137.html >>>>http://www.csounds.com/chapter1/instruments/01/137.sco >>>> >>>> >>>> >>>>-- >>>>------------------------------------------------------------------- >>>>Dr Nicolas CASTAGNE >>>> >>>>ACROE-ICA, >>>>46 av. Félix Viallet >>>>38 000 Grenoble >>>>http://acroe.imag.fr >>>> >>>>Tel : (33) 4 76 57 46 60 >>>>------------------------------------------------------------------- >>>>-- >>>>Send bugs reports to this list. >>>>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk >>> >>>Victor Lazzarini >>>Music Technology Laboratory >>>Music Department >>>National University of Ireland, Maynooth >>>-- >>>Send bugs reports to this list. >>>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk >> >> >>-- >>------------------------------------------------------------------- >>Dr Nicolas CASTAGNE >> >>ACROE-ICA, >>46 av. Félix Viallet >>38 000 Grenoble >>http://acroe.imag.fr >> >>Tel : (33) 4 76 57 46 60 >>------------------------------------------------------------------- >>-- >>Send bugs reports to this list. >>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk > >Victor Lazzarini >Music Technology Laboratory >Music Department >National University of Ireland, Maynooth >-- >Send bugs reports to this list. >To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk -- ------------------------------------------------------------------- Dr Nicolas CASTAGNE ACROE-ICA, 46 av. Félix Viallet 38 000 Grenoble http://acroe.imag.fr Tel : (33) 4 76 57 46 60 ------------------------------------------------------------------- |
| Date | 2005-12-08 11:03 |
| From | Victor Lazzarini |
| Subject | Re: Global Variables reinitialisation - Yet Another Newb Question ! |
I'm not too sure, it's difficult to tell, but I think the repetition goes at a constant rate, but it's hard to tell with the kind of input being used. The noise burst in my example demonstrates the way csound is predicted to work, and works, much more clearly. Victor At 10:57 08/12/2005, you wrote: >Hi Victor, > >Unfortunately, I have no CSound available this morning... > >Let me explain a bit more the **new question**. > >I am convinced that your analysis (which corresponds to mine) is correct. >And quite sure runing your example on my CSound (tomorrow...) will produce >the same result. > >And I completely agree with your solution (introducing an instrument #200). > >My **new question** relates not to your example, but to Pr Boulanger's >examples 137/198/199, ch 1 CSound Book, on the page : >http://www.csounds.com/chapter1/instruments/01/137/137.html >http://www.csounds.com/chapter1/instruments/01/137.sco > >Have a look at the latest notes of this score, t=46seconds, >then hear the latest notes of the mp3 sound on >http://www.csounds.com/chapter1/instruments/01/137/137.html > >Well... I myself hear a multiple-rate echo on this latest note of Pr >Boulanger's example.... > >Which contradicts your example, and our analysis... >Consequently, I wonder how Pr Boulanger's example can work correctly ! > > >Anyhow, I may write to Pr Boulanger now ;) > >Thx much >NC > > >>I don't understand. What happens when you run my example? You >>should hear just a single repeating echo every 0.8 s. If you take out >>the gacmb=0 line and add it to another higher-number instrument, then >>you have your multi-rate echoes. If that is not the case, there might a >>bug in your version of csound. If in doubt, change comb for delay and >>check for how many echoes you get. There should be only one if >>you zero the global variable in the instrument. >> >>That should be the case for any orc/sco of the kind. >> >> >> >>Victor >> >>At 10:30 08/12/2005, you wrote: >>>Hi Victor, >>> >>>Thx for your answer, which confirms my analysis ! >>> >>>Indeed, the example is taken from Dr Boulanger's first chapter of the >>>CSound Book. >>> >>>I may write to him about this, I guess... >>> >>>Anyhow, there is something a bit strange with Dr Boulanger's example. >>> >>>When hearing the latest 'notes' of the instrument/score #137, on time=46 >>>secondes, >>>http://www.csounds.com/chapter1/instruments/01/137/137.html >>>http://www.csounds.com/chapter1/instruments/01/137.sco >>> >>>I hear quite clearly a 'multiple-rate echo' as intended in the score >>>(through multiple instances of instruments #198)... >>>This does not match with what you found ! >>> >>>Should I change my hears ? :) >>>Or is there something weard ? >>> >>>All the best, >>>Nicolas >>> >>>>Just tested your example and I only get a single >>>>output, as predicted. >>>> >>>>instr 3 >>>> >>>>gacmb rand 10000 >>>> >>>>endin >>>> >>>> instr 199 ; GLOBAL ECHO >>>>idur = p3 >>>>itime = p4 >>>>iloop = p5 >>>>kenv linen 1, .01, idur, .01 >>>>acomb comb gacmb, itime, iloop, 0 >>>> >>>> >>>>out acomb*kenv >>>>gacmb =0 >>>> endin >>>> >>>>with >>>> >>>>i3 0 0.05 >>>>i 198 0 6 10 .8 >>>>i 198 0 6 10 .3 >>>>i 198 0 6 10 .3 >>>> >>>> >>>>In fact if gacmb=0 from instr 198 is removed and >>>> >>>>instr 200 >>>> >>>>gacmb = 0 >>>> >>>>endin >>>> >>>>Then all three instances output sound, as predicted, >>>>again. >>>> >>>>Victor >>>> >>>>At 18:12 07/12/2005, you wrote: >>>>>Hi all, >>>>> >>>>>yet another 'newbee', though precise, question. >>>>> >>>>> >>>>>Let's define a global echo instrument such as : >>>>> >>>>> instr 198 ; GLOBAL ECHO >>>>>idur = p3 >>>>>itime = p4 >>>>>iloop = p5 >>>>>kenv linen 1, .01, idur, .01 >>>>>acomb comb gacmb, itime, iloop, 0 >>>>> >>>>>out acomb*kenv >>>>>gacmb =0 >>>>> endin >>>>> >>>>> >>>>>This instrument work with the global variable gacmb. >>>>> >>>>> >>>>> >>>>>Now, let's create various copies of this instrument in the score : >>>>> >>>>>;ins strt dur time loopt >>>>>i 198 0 6 10 .8 >>>>>i 198 0 6 10 .3 >>>>>i 198 0 6 10 .3 >>>>> >>>>> >>>>> >>>>> >>>>>What happens when these multiple instances run in parallel ? >>>>> >>>>> >>>>> >>>>>A possible behavior would be : >>>>>When the a-rate instruction : >>>>> gacmb =0 >>>>>is executed in the first instance of the instrument, then the global >>>>>variable gacmb is set to Zero. >>>>> >>>>>Consequently, the other instances of the instrument would process a >>>>>Null signal !! >>>>> >>>>>MMmhhhhh... Let me guess... This is not the CSound behavior in that case. >>>>> >>>>>Possibly, the multiple instances are executed 'in parallel', Opcode >>>>>per Opcode... But I am not sure at all ! >>>>> >>>>> >>>>>I red carefully the CSound program flow >>>>>http://www.csounds.com/internals/index.html but did not find the answer... >>>>> >>>>> >>>>>I would be grateful if someone could tell me a bit more about : >>>>>- how CSound behaves in that case >>>>>- why he behaves so (how it is implemented) >>>>> >>>>> >>>>>Thx much in advance ! >>>>>(and for answers to my past questions) >>>>> >>>>>Nicolas >>>>> >>>>> >>>>>PS : as you may have seen, my 'example' is coming from Dr Boulanger's >>>>>first chapter of the CSound Book : >>>>>http://www.csounds.com/chapter1/index.html >>>>> >>>>>Indeed, it corresponds with instrument 137 in this chapter : >>>>>http://www.csounds.com/chapter1/instruments/01/137/137.html >>>>>http://www.csounds.com/chapter1/instruments/01/137.sco >>>>> >>>>> >>>>> >>>>>-- >>>>>------------------------------------------------------------------- >>>>>Dr Nicolas CASTAGNE >>>>> >>>>>ACROE-ICA, >>>>>46 av. Félix Viallet >>>>>38 000 Grenoble >>>>>http://acroe.imag.fr >>>>> >>>>>Tel : (33) 4 76 57 46 60 >>>>>------------------------------------------------------------------- >>>>>-- >>>>>Send bugs reports to this list. >>>>>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk >>>> >>>>Victor Lazzarini >>>>Music Technology Laboratory >>>>Music Department >>>>National University of Ireland, Maynooth >>>>-- >>>>Send bugs reports to this list. >>>>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk >>> >>> >>>-- >>>------------------------------------------------------------------- >>>Dr Nicolas CASTAGNE >>> >>>ACROE-ICA, >>>46 av. Félix Viallet >>>38 000 Grenoble >>>http://acroe.imag.fr >>> >>>Tel : (33) 4 76 57 46 60 >>>------------------------------------------------------------------- >>>-- >>>Send bugs reports to this list. >>>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk >> >>Victor Lazzarini >>Music Technology Laboratory >>Music Department >>National University of Ireland, Maynooth >>-- >>Send bugs reports to this list. >>To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk > > >-- >------------------------------------------------------------------- >Dr Nicolas CASTAGNE > >ACROE-ICA, >46 av. Félix Viallet >38 000 Grenoble >http://acroe.imag.fr > >Tel : (33) 4 76 57 46 60 >------------------------------------------------------------------- >-- >Send bugs reports to this list. >To unsubscribe, send email to csound-unsubscribe@lists.bath.ac.uk Victor Lazzarini Music Technology Laboratory Music Department National University of Ireland, Maynooth |