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<CsoundSynthesizer>
<CsOptions>
-d -o dac
</CsOptions>
<CsInstruments>
/* ksmps needs to be an integer div of
hopsize */
ksmps = 64
instr 1
ihopsize = 256 ; hopsize
ifftsize = 1024 ; FFT size
iolaps = ifftsize/ihopsize ; overlaps
ibw = sr/ifftsize ; bin bandwidth
kcnt init 0 ; counting vars
krow init 0
kOla[] init ifftsize ; overlap-add buffer
kIn[] init ifftsize ; input buffer
kOut[][] init iolaps, ifftsize ; output buffers
a1 diskin2 "fox.wav",1,0,1 ; audio input
/* every hopsize samples */
if kcnt == ihopsize then
/* window and take FFT */
kWin[] window kIn,krow*ihopsize
kSpec[] rfft kWin
kSpec rect2pol kSpec
/* reduce mags between high and low freqs */
ilow = 0
ihigh = 1000
ki = int(ilow/ibw)
until ki >= int(ihigh/ibw) do
kSpec[ki] = kSpec[ki]*0.1
ki += 2
od
kSpec pol2rect kSpec
/* IFFT + window */
kRow[] rifft kSpec
kWin window kRow, krow*ihopsize
/* place it on out buffer */
kOut setrow kWin, krow
/* zero the ola buffer */
kOla = 0
/* overlap-add */
ki = 0
until ki == iolaps do
kRow getrow kOut, ki
kOla = kOla + kRow
ki += 1
od
/* update counters */
krow = (krow+1)%iolaps
kcnt = 0
endif
/* shift audio in/out of buffers */
kIn shiftin a1
a2 shiftout kOla
out a2/iolaps
/* increment counter */
kcnt += ksmps
endin
</CsInstruments>
<CsScore>
i1 0 10
</CsScore>
</CsoundSynthesizer>
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