white-phase.jsfx

desc:White noise generator for testing surround sound plugins
tags:noise generator stereo
author:Michael Pannekoek
name:White Noise Generator
product:White Noise Generator
vendor:Michael Pannekoek

slider1:phase=0<-90,90,0.1>Phase (degrees)
slider2:amplitude=-30<-60,0,0.1>Amplitude (dB)

out_pin:noise_L
out_pin:noise_R

@init
function radians(degrees)
(
    degrees * ($pi / 180.0)
);


@slider
// add pi/4 so that the cosval and sinval are equal when phase is 0
rad = radians(phase) + $pi/4;
cosval = cos(rad);
sinval = sin(rad);
// convert amplitude from dB to linear
gain = pow(10, amplitude / 20);


@sample
// generate a random number between -1 and 1
ran = rand(2)-1;
// multiply by the gain
out = ran * gain;
spl0 = out * cosval;
spl1 = out * sinval;