Description

Trace a series of line segments between specified points with cosine interpolation.

Syntax

ares cosseg ia, idur1, ib [, idur2] [, ic] [...]

kres cosseg ia, idur1, ib [, idur2] [, ic] [...]

Initialization

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.

Performance

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.

Examples

Here is an example of the cosseg opcode. It uses the file cosseg.csd.

<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>

See Also

expon, expseg, expsegb, expsegr, line, linseg, linsegr transeg transegb

Credits

New in version 5.18