pvsarp
Prev | Orchestra Opcodes and Operators | Next

## pvsarp

pvsarp — Arpeggiate the spectral components of a streaming pv signal.

## Description

This opcode arpeggiates spectral components, by amplifying one bin and attenuating all the others around it. Used with an LFO it will provide a spectral arpeggiator similar to Trevor Wishart's CDP program specarp.

## Syntax

    fsig pvsarp fsigin, kbin, kdepth, kgain

## Performance

fsig -- output pv stream

fsigin -- input pv stream

kbin -- target bin, normalised 0 - 1 (0Hz - Nyquist).

kdepth -- depth of attenuation of surrounding bins

kgain -- gain boost applied to target bin

| Warning
It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode.

## Examples

Example 349. Example

    asig  in                                 ; get the signal in

    fsig  pvsanal   asig, 1024, 256, 1024, 1 ; analyse it
    kbin  oscili   0.1, 0.5, 1               ; ftable 1 in the 0-1 range
    ftps  pvsarp   fsig, kbin+0.01, 0, 2     ; arpeggiate it (range 220.5 - 2425.5)
    atps  pvsynth  ftps                      ; synthesise it

           out atps

The example above shows a spectral arpeggiator working in the 220.5 - 2425.5 range (sr=44100). The LFO outputs a positive-only signal, so its ftable will be defined in the 0 - 1 range (a hanning window can be used, for instance).

## Credits

Author: Victor Lazzarini;
April 2005

New plugin in version 5

April 2005.

Prev | Up | Next
pvsanal | Home | pvscross