[Csnd] scanned synthesis ihold not working
| Date | 2022-01-05 16:27 |
| From | Gerard Rodríguez |
| Subject | [Csnd] scanned synthesis ihold not working |
Hello list, <CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in No messages -odac ; -iadc -d ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o scans.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 1 instr 1 a0 = 0 ; scanu init, irate, ifnvel, ifnmass, ifnstif, ifncentr, ifndamp, kmass, kstif, kcentr, kdamp, ileft, iright, kpos, kstrngth, ain, idisp, id scanu 1, .01, 6, 2, 3, 4, 5, 2, .1, .1, -.01, .1, .5, 0, 0, a0, 1, 2 ;ar scans kamp, kfreq, ifntraj, id a1 scans ampdb(p5), cpsmidinn(p4), 7, 2 ihold outs a1,a1 endin </CsInstruments> <CsScore> f1 0 128 -7 0 128 0 ; Initial condition f2 0 128 -7 1 128 1 ; uniform masses f3 0 16384 -23 "string-128.matrxB" ; Spring matrices f4 0 128 -7 0 128 0 ; no force ; Centering force f5 0 128 -7 0 128 0 ; no damping ; Damping f6 0 128 -7 0 128 0 ; Initial velocity f7 0 128 -7 0 128 127 ; linear Trajectories ; Note list f 1 0 128 -7 -1 128 1 0 ; sawtooth i1 0 1000 69.00 75 e </CsScore> </CsoundSynthesizer> In this very simple scanned synthesis instrument, either using ihold or a negative p3 doesn't work. (csound just exits immediately). I need the note to be held to simulate rehammering the string *without* resetting the state of the masses. I was going to do some hack like this: while indx < 128 do k1,k2 xscanmap 2, 1, 1, indx kvel table indx,1 tablew k1+kvel,indx,1 tablew k2,indx,6 od to add the hammer waveform over the current state of the vibrating system but I can't do that without the note being held. Thank you in advance. |
| Date | 2022-01-05 18:18 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] [EXTERNAL] [Csnd] scanned synthesis ihold not working |
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To keep Csound open use
f 0 z
that'll keep it going beyond our lifetimes
Prof. Victor Lazzarini
Maynooth University
Ireland
On 5 Jan 2022, at 16:28, Gerard Rodríguez <binbiniqegabenik@gmail.com> wrote:
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| Date | 2022-01-05 18:53 |
| From | Gerard Rodríguez |
| Subject | Re: [Csnd] [EXTERNAL] [Csnd] scanned synthesis ihold not working |
Hello Victor, Simple solution, thank you very much! On the same topic, am I going about this the right way?, it seems a bit of a hacky solution and maybe something that should be integrated into scan/u to be able to retrigger it. Missatge de Victor Lazzarini <Victor.Lazzarini@mu.ie> del dia dc., 5 de gen. 2022 a les 19:18:
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| Date | 2022-01-05 19:02 |
| From | Gerard Rodríguez |
| Subject | Re: [Csnd] [EXTERNAL] [Csnd] scanned synthesis ihold not working |
for a bit more context what I'm trying to do is a scanned synthesis instrument with a behaviour similar to sympathetic resonance. I'm modelling 2 "strings" for now as the 2 halves of a 128 string and a hammer shape to hit one half or the other. This induces some vibration on the other end.Missatge de Victor Lazzarini <Victor.Lazzarini@mu.ie> del dia dc., 5 de gen. 2022 a les 19:18:
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| Date | 2022-01-06 12:49 |
| From | Gerard Rodríguez |
| Subject | Re: [Csnd] [EXTERNAL] [Csnd] scanned synthesis ihold not working |
I'm quite lost, nothing I try works. 1. I've tried to hammer the instrument using ain: I create an instrument to generate the audio waveform to strike the spring with table 1. This should generate a very short burst and stay at 0 afterwards instr 2 kamp linseg 1, 0.0001, 0, 50, 0 a1 oscil 1, cpsmidinn(p4), 1 zaw a1*kamp, 1 endin and read it on the scanned synthesis instrument instr 1 a0 zar 1 ; scanu init, irate, ifnvel, ifnmass, ifnstif, ifncentr, ifndamp, kmass, kstif, kcentr, kdamp, ileft, iright, kpos, kstrngth, ain, idisp, id scanu 1, .01, 6, 2, 3, 4, 5, 2, .1, .1, -.01, .1, .5, 0, 0, a0, 1, 2 ;ar scans kamp, kfreq, ifntraj, id a1 scans ampdb(75), cpsmidinn(p4), 7, 2 outs a1,a1 endin my intention is that this generates exactly the same excitation that it would by starting with table 1 f1 0 128 -7 0 128 0; empty table i1 0 -1 69.00 ; trigger instrument forever f 1 1 128 -7 0 120 0 0 1 8 1 ; line hammer i2 1 10; Hammer it! ftable 1: 128 points, scalemax 1.000 ____ ________________________________________________________________ This should be the starting shape that the excitation takes, however this is what happens: Mass displacement 128 points, scalemax 0.208 _ . . ._ ' ________________________________________________________________ What is this?? why are there 2 peaks and not just the line to the right? Furthermore, as time goes on, it seems to get louder, but the audio being sent to the scanned instrument should be 0! (I tried this by giving giant values to the masses so that it doesn't move at all) 2. I've tried saving the state of the springs with scanmap: indx = 0 while indx < 128 do k1,k2 scanmap 2, 1, 1, indx tablew k1,indx,11 tablew k2,indx,66 indx = indx + 1 od however this seems to yield 2 empty tables Missatge de Gerard Rodríguez <binbiniqegabenik@gmail.com> del dia dc., 5 de gen. 2022 a les 20:02:
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| Date | 2022-01-06 14:08 |
| From | Gerard Rodríguez |
| Subject | Re: [Csnd] [EXTERNAL] [Csnd] scanned synthesis ihold not working |
So, I think I completely misunderstood what feeding audio does. Of course it can't feed the 128 samples at once into each of the springs (which is what I want). Instead it's probably feeding each sample at once to all of the springs (although it seems it's scaled for each mass) This is feeding just 1 as ain. I think this should be documented.Mass displacement 128 points, scalemax 6902.736 _ _..---'''''' ''''''--..__ _.-'' '--._ _.-' '-._ _-' -._ .' -_ .' -_ _' - _ - - ________________________________________________________________ > ain -- audio input that adds to the velocity of the masses. Amplitude should not be too great. Missatge de Gerard Rodríguez <binbiniqegabenik@gmail.com> del dia dj., 6 de gen. 2022 a les 13:49:
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