Spectral Processing:Streaming
tradsyn
tradsyn
Streaming partial track additive synthesis
Description
The tradsyn opcode takes an input containg a TRACKS pv streaming signal (as generated,
for instance by partials),as described in Lazzarini et al, "Time-stretching using the Instantaneous Frequency Distribution and Partial
Tracking", Proc.of ICMC05, Barcelona. It resynthesises the signal using linear amplitude and frequency
interpolation to drive a bank of interpolating oscillators with amplitude and pitch scaling controls.
Syntax
asig tradsyn fin, kscal, kpitch, kmaxtracks, ifn
Performance
asig -- output audio rate signal
fin -- input pv stream in TRACKS format
kscal -- amplitude scaling
kpitch -- pitch scaling
kmaxtracks -- max number of tracks in resynthesis. Limiting this will cause
a non-linear filtering effect, by discarding newer and higher-frequency tracks (tracks are ordered
by start time and ascending frequency, respectively)
ifn -- function table containing one cycle of a sinusoid (sine or cosine)
Examples
Example
ain inch 1 ; input signal
fs1,fsi2 pvsifd ain,2048,512,1 ; ifd analysis
fst partials fs1,fsi2,.003,1,3,500 ; partial tracking
aout tradsyn fst, 1, 1.5, 500, 1 ; resynthesis (up a 5th)
out aout
The example above shows partial tracking of an ifd-analysis signal and
linear additive resynthesis with pitch shifting.
Credits
Author: &namevictor;
June 2005
New plugin in version 5
November 2004.