transeg
transeg — Constructs a user-definable envelope.
Syntax
ares transeg ia, idur, itype, ib [, idur2] [, itype] [, ic] ...
kres transeg ia, idur, itype, ib [, idur2] [, itype] [, ic] ...
Initialization
ia -- starting value.
ib, ic, etc. -- value after idur seconds.
idur -- duration in seconds of first segment. A zero or negative value will cause all initialization to be skipped.
idur2,... idurx etc. -- duration in seconds of segment
itype, itype2, etc. -- if 0, a straight line is produced. If non-zero, then transeg creates the following curve, for n steps:
ibeg + (ivalue - ibeg) * (1 - exp( i*itype/(n-1) )) / (1 - exp(itype))
Performance
If itype > 0, there is a slowly rising (concave) or slowly decaying (convex) curve, while if itype < 0, the curve is fast rising (convex) or fast decaying (concave). See also GEN16.
Examples
Here is an example of the transeg opcode. It uses the file transeg.csd. The example produces the following output:
Output of the transeg example.
Example 942. Example of the transeg 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 ; Audio out Audio in -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o transeg.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 2 0dbfs = 1 instr 1 ;p4 and p5 determine the type of curve for each ;section of the envelope kenv transeg 0.01, p3*0.25, p4, 1, p3*0.75, p5, 0.01 a1 oscil kenv, 440, 1 outs a1, a1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 i 1 0 2 2 2 i 1 + . 5 5 i 1 + . 1 1 i 1 + . 0 0 i 1 + . -2 -2 i 1 + . -2 2 i 1 + . 2 -2 e </CsScore> </CsoundSynthesizer>