cosseg — Trace a series of line segments between specified points with cosine interpolation.
ares cosseg ia, idur1, ib [, idur2] [, ic] [...]
kres cosseg ia, idur1, ib [, idur2] [, ic] [...]
ia -- starting value.
ib, ic, etc. -- value after dur1 seconds, etc.
idur1 -- duration in seconds of first segment. A zero or negative value will cause all initialization to be skipped.
idur2, idur3, etc. -- duration in seconds of subsequent segments. A zero or negative value will terminate the initialization process with the preceding point, permitting the last-defined line or curve to be continued indefinitely in performance. The default is zero.
These units generate control or audio signals whose values can pass through 2 or more specified points. The sum of dur values may or may not equal the instrument's performance time: a shorter performance will truncate the specified pattern, while a longer one will cause the last value to be repeated until the end of the note.
Here is an example of the cosseg opcode. It uses the file cosseg.csd.
Example 138. Example of the cosseg 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 linseg.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 giSine ftgen 0, 0, 2^10, 10, 1 instr 1 kcps = cpspch(p4) kenv cosseg 0, 0.25, 1, 0.75, 0 ; together = 1 sec asig poscil kenv, kcps, giSine outs asig, asig endin instr 2 ; scaling to duration kcps = cpspch(p4) kenv cosseg 0, p3*0.25, 1, p3*0.75, 0 asig poscil kenv, kcps, giSine outs asig, asig endin instr 3 ; with negative value kcps = cpspch(p4) aenv cosseg 0, 0.1, 1, 0.5, -0.9, 0.4, 0 asig poscil aenv, kcps, giSine outs asig, asig endin </CsInstruments> <CsScore> i 1 0 1 7.00 ; = 1 sec, p3 fits exactly i 1 2 2 7.00 ; = 2 sec, p3 truncated at 1 sec i 2 4 1 7.00 ; scales to duration i 2 6 2 7.00 ; of p3 i 3 9 2 7.00 e </CsScore> </CsoundSynthesizer>