trigger — Informs when a krate signal crosses a threshold.
ksig -- input signal
kthreshold -- trigger threshold
kmode -- can be 0 , 1 or 2
Normally trigger outputs zeroes: only each time ksig crosses kthreshold trigger outputs a 1. There are three modes of using ktrig:
kmode = 0 - (down-up) ktrig outputs a 1 when current value of ksig is higher than kthreshold, while old value of ksig was equal to or lower than kthreshold.
kmode = 1 - (up-down) ktrig outputs a 1 when current value of ksig is lower than kthreshold while old value of ksig was equal or higher than kthreshold.
kmode = 2 - (both) ktrig outputs a 1 in both the two previous cases.
Here is an example of the trigger opcode. It uses the file trigger.csd.
Example 948. Example of the trigger opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o trigger.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 kmtr lfo 1, 1, 1 ;triangle wave kmode = p4 ktr trigger kmtr, .5, kmode printk2 ktr schedkwhen ktr, 0, 3, 2, 0, .3 endin instr 2 aenv linseg 0,p3*.1,1,p3*.3,1,p3*.6,0 ;envelope a1 poscil .3*aenv, 1000, 1 outs a1, a1 endin </CsInstruments> <CsScore> f 1 0 16384 10 1 ;sine i 1 0 3 0 ;down-up i 1 4 3 2 ;down-up & up=down e </CsScore> </CsoundSynthesizer>