pvsfilter

pvsfilter — Multiply amplitudes of a pvoc stream by those of a second pvoc stream, with dynamic scaling.

Description

Multiply amplitudes of a pvoc stream by those of a second pvoc stream, with dynamic scaling.

Syntax

fsig pvsfilter fsigin, fsigfil, kdepth[, igain]

Performance

fsig -- output pv stream

fsigin -- input pv stream.

fsigfil -- filtering pvoc stream.

kdepth -- controls the depth of filtering of fsigin by fsigfil .

igain -- amplitude scaling (optional, defaults to 1).

Here the input pvoc stream amplitudes are modified by the filtering stream, keeping its frequencies intact. As usual, both signals have to be in the same format.

Examples

Example 301. Example

kfreq  expon 500, p3, 4000           ; 3-octave sweep
kdepth linseg 1, p3/2, 0.5, p3/2, 1  ; varying filter depth

asig  in                             ; input
afil  oscili  1, kfreq, 1            ; filter t-domain signal

fin   pvsanal  asig1,1024,256,1024,0  ; pvoc analysis 
fil   pvsanal  asig2,1024,256,1024,0  
fout  pvsfilter fin, fout, kdepth    ; filter signal
aout	pvsynth fsigout              ; pvoc synthesis
        

In the example above the filter curve will depend on the spectral envelope of afil; in the simple case of a sinusoid, it will be equivalent to a narrowband band-pass filter.

Credits

Author: Victor Lazzarini;
November 2004

New plugin in version 5

November 2004.