GEN25 — Construct functions from segments of exponential curves in breakpoint fashion.
These subroutines are used to construct functions from segments of exponential curves in breakpoint fashion.
size -- number of points in the table. Must be a power of 2 or power-of-2 plus 1 (see f statement).
x1, x2, x3, etc. -- locations in table at which to attain the following y value. Must be in increasing order. If the last value is less than size, then the rest will be set to zero. Should not be negative but can be zero.
y1, y2, y3,, etc. -- Breakpoint values attained at the location specified by the preceding x value. These must be non-zero and must be alike in sign.
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If p4 is positive, functions are post-normalized (rescaled to a maximum absolute value of 1 after generation). A negative p4 will cause rescaling to be skipped. |
Here is an example of the GEN25 generator. It uses the file gen25.csd.
Example 1202. Example of the GEN25 generator.
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 gen25.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 gisin ftgen 1, 0, 32768, 10, 1 gienv ftgen 2, 0, 1025, 25, 0, 0.01, 200, 1, 400, 1, 513, 0.01 ; y value must be >= 0 instr 1 kcps init 3/p3 ;play 3x over duration of note kndx phasor kcps ixmode = 1 ;normalize to 0-1 kval table kndx, gienv, ixmode kval =kval*100 ;scale up to 0-100 asig poscil 1, 220+kval, gisin ;use table for amplitude outs asig, asig endin </CsInstruments> <CsScore> i 1 0 4 e </CsScore> </CsoundSynthesizer>
This is the diagram of the waveform of the GEN25 routine, as used in the example: