cossegb

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

Syntax

ares cossegb ia, itim1, ib [, itim2] [, ic] [...]
kres cossegb ia, itim1, ib [, itim2] [, ic] [...]

Initialization

ia -- starting value.

ib, ic, etc. -- value at tim1 seconds, etc.

itim1 -- time in seconds of end of first segment. A zero or negative value will cause all initialization to be skipped.

itim2, itim3, etc. -- time in seconds at the end of subsequent segments.

Performance

These units generate control or audio signals whose values can pass through 2 or more specified points. The last tim value 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 cossegb opcode. It uses the file cossegb.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 cossegb 0, 0.25, 1, 1, 0
asig poscil kenv, kcps, giSine
     outs asig, asig

endin

instr 2 ; scaling to duration

kcps = cpspch(p4)
kenv cossegb 0, p3*0.25, 1, p3, 0
asig poscil kenv, 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

e
</CsScore>
</CsoundSynthesizer>

See also

Linear and Exponential Generators

Credits

Author: John ffitch
Aug 2012

New in version 5.18