expsegb — Trace a series of exponential segments between specified absolute points.
ares expsegb ia, itim1, ib [, itim2] [, ic] [...]
kres expsegb ia, itim1, ib [, itim2] [, ic] [...]
ia -- starting value. Zero is illegal for exponentials.
ib, ic, etc. -- value at tim1 seconds, etc. For exponentials, must be non-zero and must agree in sign with ia.
itim1 -- time in seconds of end of first segment.
itim2, itim3, etc. -- time in seconds of subsequent ends of segments.
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-defined segment to continue on in the same direction.
Note that the expsegb opcode does not operate correctly at audio rate when segments are shorter than a k-period. Try the expsegba opcode instead.
Here is an example of the expsegb opcode. It uses the file expsegb.csd.
Example 240. Example of the expsegb 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 expseg.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; p4 = frequency in pitch-class notation. kcps = cpspch(p4) ; Create an amplitude envelope. kenv expsegb 0.01, p3*0.25, 1, p3, 0.01 kamp = kenv * 30000 a1 oscil kamp, kcps, 1 out a1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 ; Play Instrument #1 for a half-second, p4=8.00 i 1 0 0.5 8.00 ; Play Instrument #1 for a half-second, p4=8.01 i 1 1 0.5 8.01 ; Play Instrument #1 for a half-second, p4=8.02 i 1 2 0.5 8.02 ; Play Instrument #1 for a half-second, p4=8.03 i 1 3 0.5 8.03 e </CsScore> </CsoundSynthesizer>