pvscent — Calculate the spectral centroid of a signal.
kcent -- the spectral centroid
acent -- the spectral centroid
fsig -- an input pv stream
Here is an example of the use of the pvscent opcode. It uses the file pvscent.csd.
Example 820. Example of the pvscent 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 ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o pvscent.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ;; example written by joachim heintz 2009 giSine ftgen 0, 0, 4096, 10, 1 instr 1 irefrtm = p4; time for generating new values for the spectral centroid ifftsize = 1024 ioverlap = ifftsize / 4 iwinsize = ifftsize iwinshape = 1; von-Hann window ;Sfile = "flute-C-octave0.wav" Sfile = "fox.wav" ain soundin Sfile fftin pvsanal ain, ifftsize, ioverlap, iwinsize, iwinshape; fft-analysis of the audio-signal ktrig metro 1 / irefrtm if ktrig == 1 then kcenter pvscent fftin; spectral center endif aout oscil .2, kcenter, giSine outs aout, aout endin </CsInstruments> <CsScore> i 1 0 2.757 .3 i 1 3 2.757 .05 i 1 6 2.757 .005 i 1 9 2.757 .001 e </CsScore> </CsoundSynthesizer>