pvsbandwidth
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## pvsbandwidth

pvsbandwidth — Calculate the spectral bandwidth of a signal.

## Description

Calculate the spectral bandwidth of a signal from its discrete Fourier transform.

## Syntax

    kbnd pvsbandwidth fsig

## Performance

kbnd -- the spectral bandwidth

fsig -- an input pv stream

## Examples

Here is an example of the use of the pvsbandwidth opcode. It uses the file pvsbandwidth.csd.

Example 808. Example of the pvsbandwidth 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 pvsbandwidth.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
       kbw		pvsbandwidth fftin; spectral center
       printks2   	"--**spectral center frequency = %f\n", kbw
     endif
     aout	vco2	.2, 130
     asig   butterbp  aout,kcenter,kbw
     	outs asig, asig
     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>

## See Also

pvsanal, pvsynth, pvsadsyn, pvspitch

## Credits

Author: Victor Lazzarini
March 2020

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