[Csnd] monitor opcode
| Date | 2021-01-22 09:58 |
| From | thorin kerr |
| Subject | [Csnd] monitor opcode |
Hi all... quick question re. the monitor opcode - https://csound.com/docs/manual/monitor.html - the manual mentions "It should not be used for processing the signal further." Is there a good reason for this? Does it mess up threading or something under the hood?
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Thorin |
| Date | 2021-01-22 10:03 |
| From | Oeyvind Brandtsegg |
| Subject | Re: [Csnd] monitor opcode |
I think it is because the audio output from monitor is the actual audio output from Csound, so if you process it and then send the processed signal out, you might get some oddities. Haven't tried it, but I suspect you might get a closed feedback loop. fre. 22. jan. 2021 kl. 10:58 skrev thorin kerr <thorin.kerr@gmail.com>:
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| Date | 2021-01-22 15:12 |
| From | thorin kerr |
| Subject | Re: [Csnd] monitor opcode |
Well...this seems to work, and could have its uses. If you output an inverted phase version of the monitor output, that'll effectively cancel the output. But in-between it also gives you the opportunity to process a copy of the audio from monitor, and mix the processed version into the output. So, after the original is cancelled, all you're left with is the processed output. That was wordy, so here's an example. Append this instrument (and event) to any orchestra, and you instantly have a global volume limiter.
;;make sure this is the highest numbered instrument! instr 100
aout1, aout2 monitor ;get audio from spout ;;copy audio and limit areplaceout1 compress aout1, aout1, 0, 90, 90, 100, 0.0, 0.08, 0.08 areplaceout2 compress aout2, aout2, 0, 90, 90, 100, 0.0, 0.08, 0.08 ;;phase flip original signal acancel1 = -aout1 acancel2 = -aout2 ;sum asum1 = areplaceout1 + acancel1 asum2 = areplaceout2 + acancel2 ;output - the phase flipped signal should cancel the original, ;leaving just the compressed signal. outs asum1, asum2 endin event_i "i", 100, 0, -1 On Fri, Jan 22, 2021 at 8:04 PM Oeyvind Brandtsegg <obrandts@gmail.com> wrote:
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| Date | 2021-01-28 23:24 |
| From | "Dr. Richard Boulanger" |
| Subject | Re: [Csnd] monitor opcode |
This works really great. Thanks for sharing it. Here is a little test example for everyone to try. - For me, this will be worth dropping into a lot of 'test' instruments (and student homework assignments!!! ;-) ) <CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 idb = ampdbfs(p4) k1 adsr .1,.1,.9,.1 a1 poscil idb*k1, cpsmidinn(p5) outs a1, a1 endin ;;Thorin Kerr - Global Limiter Instrument ;;NOTE: Make sure this is the highest numbered instrument! instr 100 aout1, aout2 monitor ;get audio from spout ;;copy audio and limit areplaceout1 compress aout1, aout1, 0, 90, 90, 100, 0.0, 0.08, 0.08 areplaceout2 compress aout2, aout2, 0, 90, 90, 100, 0.0, 0.08, 0.08 ;;phase flip original signal acancel1 = -aout1 acancel2 = -aout2 ;;sum asum1 = areplaceout1 + acancel1 asum2 = areplaceout2 + acancel2 ;;output - the phase flipped signal should cancel the original, ;;leaving just the compressed signal. outs asum1, asum2 endin event_i "i", 100, 0, -1 </CsInstruments> <CsScore> f1 0 4096 10 1 t 0 120 i1 0 1 -24 60 i. 2 . -18 62 i. 4 . -6 64 i. 6 . -3 65 i. 8 . 0 67 i. 10 . +3 69 i. 12 . +6 71 i. 14 . +12 72 s f0 1 s i1 0 2 -1 60 i. 0 . -1 62 i. 0 . -1 64 i. 0 . -1 65 i. 0 . -1 67 i. 0 . -1 69 i. 0 . -1 71 i. 0 . -1 72 s f0 1 s i1 0 2 6 60 i. 0 . . 62 i. 0 . . 64 i. 0 . . 65 i. 0 . . 67 i. 0 . . 69 i. 0 . . 71 i. 0 . . 72 s f0 1 s i1 0 2 36 60 i. 0 . . 62 i. 0 . . 64 i. 0 . . 65 i. 0 . . 67 i. 0 . . 69 i. 0 . . 71 i. 0 . . 72 s f0 1 s i1 0 2 96 60 i. 0 . . 62 i. 0 . . 64 i. 0 . . 65 i. 0 . . 67 i. 0 . . 69 i. 0 . . 71 i. 0 . . 72 s f0 1 s i1 0 4 -24 60 i. 0 . . 62 i. 0 . . 64 i. 0 . . 65 i. 0 . . 67 i. 0 . . 69 i. 0 . . 71 i. 0 . . 72 </CsScore> </CsoundSynthesizer> - dB Dr. Richard Boulanger Professor Electronic Production and Design Berklee College of Music Professional Writing & Technology Division On Fri, Jan 22, 2021 at 10:13 AM thorin kerr <thorin.kerr@gmail.com> wrote:
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