mirror of
http://CODE.RHODECODE.COM/u/O/O/O
synced 2024-11-10 16:43:37 -05:00
160 lines
3.7 KiB
Plaintext
160 lines
3.7 KiB
Plaintext
desc:O____ROTARENEG_ESION_TEWLEW_NAISUAG____O____GAUSIAN_WELWET_NOISE_GENERATOR____O
|
|
//tags: analysis generator synthesis
|
|
//author: SCHWA
|
|
|
|
// Generator choices are listed in rough order of fanciness and cost.
|
|
|
|
slider1:-16<-120,6,0.1>Noise dB (RMS)
|
|
slider2:0.5<0,1,0.01>Wet Mix
|
|
slider3:1<0,3,1{Central Limit Approximation,Box-Muller,Ziggurat (not implemented yet),Inverse Transform}>Gaussian Generator
|
|
slider4:0<-1,1>Noise Mean (should be ~0)
|
|
slider5:0<0,2>Noise Standard Deviation (should be ~1)
|
|
|
|
in_pin:left input
|
|
in_pin:right input
|
|
out_pin:left output
|
|
out_pin:right output
|
|
|
|
@init
|
|
|
|
AMP_DB = 20.0 / log(10);
|
|
|
|
CENTRAL_LIMIT = 0;
|
|
BOX_MULLER = 1;
|
|
ZIGGURAT = 2;
|
|
INV_TRANSFORM = 3;
|
|
|
|
@slider
|
|
|
|
noise_level = exp(slider1 / AMP_DB);
|
|
|
|
(slider3 == CENTRAL_LIMIT) ? (
|
|
N_DEV = 12;
|
|
)
|
|
:
|
|
(slider3 == INV_TRANSFORM) ? (
|
|
A1 = -39.69683028665376;
|
|
A2 = 220.9460984245205;
|
|
A3 = -275.9285104469687;
|
|
A4 = 138.3577518672690;
|
|
A5 = -30.66479806614716;
|
|
A6 = 2.506628277459239;
|
|
|
|
B1 = -54.47609879822406;
|
|
B2 = 161.5858368580409;
|
|
B3 = -155.6989798598866;
|
|
B4 = 66.80131188771972;
|
|
B5 = -13.28068155288572;
|
|
|
|
C1 = -0.007784894002430293;
|
|
C2 = -0.3223964580411365;
|
|
C3 = -2.400758277161838;
|
|
C4 = -2.549732539343734;
|
|
C5 = 4.374664141464968;
|
|
C6 = 2.938163982698783;
|
|
|
|
D1 = 0.007784695709041462;
|
|
D2 = 0.3224671290700398;
|
|
D3 = 2.445134137142996;
|
|
D4 = 3.754408661907416;
|
|
|
|
P_LO = 0.02425;
|
|
P_HI = 1.0 - P_LO;
|
|
);
|
|
|
|
i = sum = sum2 = 0;
|
|
|
|
@sample
|
|
|
|
z0 = z1 = 0;
|
|
|
|
(slider3 == CENTRAL_LIMIT) ? (
|
|
|
|
// Quick & dirty.
|
|
loop (N_DEV,
|
|
z0 += rand(1);
|
|
z1 += rand(1);
|
|
);
|
|
z0 -= N_DEV / 2.0;
|
|
z1 -= N_DEV / 2.0;
|
|
)
|
|
:
|
|
(slider3 == BOX_MULLER) ? (
|
|
|
|
// Conveniently a stereo twofer.
|
|
w = 0;
|
|
while (
|
|
z0 = 2.0 * rand(1) - 1.0;
|
|
z1 = 2.0 * rand(1) - 1.0;
|
|
w = z0 * z0 + z1 * z1;
|
|
w >= 1.0;
|
|
);
|
|
w = sqrt(-2.0 * log(w) / w);
|
|
z0 *= w;
|
|
z1 *= w;
|
|
)
|
|
:
|
|
(slider3 == INV_TRANSFORM) ? (
|
|
|
|
r0 = rand(1);
|
|
r1 = rand(1);
|
|
|
|
(r0 < P_LO) ? (
|
|
q = sqrt(-2.0 * log(r0));
|
|
z0 = ((((C1 * q + C2) * q + C3) * q + C4) * q + C5) * q + C6;
|
|
z0 /= (((D1 * q + D2) * q + D3) * q + D4) * q + 1.0;
|
|
)
|
|
:
|
|
(r0 < P_HI) ? (
|
|
q = r0 - 0.5;
|
|
r = q * q;
|
|
z0 = (((((A1 * r + A2) * r + A3) * r + A4) * r + A5) * r + A6) * q;
|
|
z0 /= ((((B1 * r + B2) * r + B3) * r + B4) * r + B5) * r + 1.0;
|
|
)
|
|
:
|
|
(
|
|
q = sqrt(-2.0 * log(1.0 - r0));
|
|
z0 = -(((((C1 * q + C2) * q + C3) * q + C4) * q + C5) * q + C6);
|
|
z0 /= (((D1 * q + D2) * q + D3) * q + D4) * q + 1.0;
|
|
);
|
|
|
|
(r1 < P_LO) ? (
|
|
q = sqrt(-2.0 * log(r1));
|
|
z1 = ((((C1 * q + C2) * q + C3) * q + C4) * q + C5) * q + C6;
|
|
z1 /= (((D1 * q + D2) * q + D3) * q + D4) * q + 1.0;
|
|
)
|
|
:
|
|
(r1 < P_HI) ? (
|
|
q = r1 - 0.5;
|
|
r = q * q;
|
|
z1 = (((((A1 * r + A2) * r + A3) * r + A4) * r + A5) * r + A6) * q;
|
|
z1 /= ((((B1 * r + B2) * r + B3) * r + B4) * r + B5) * r + 1.0;
|
|
)
|
|
:
|
|
(
|
|
q = sqrt(-2.0 * log(1.0 - r0));
|
|
z1 = -(((((C1 * q + C2) * q + C3) * q + C4) * q + C5) * q + C6);
|
|
z1 /= (((D1 * q + D2) * q + D3) * q + D4) * q + 1.0;
|
|
);
|
|
);
|
|
|
|
spl0 = ((FLOOR(spl0 * (1.0 - slider2) + z0 * noise_level * slider2))+.5)/6;
|
|
spl1 = ((FLOOR(spl1 * (1.0 - slider2) + z1 * noise_level * slider2))+.5)/6;
|
|
//spl0 = spl0 * (1.0 - slider2) + z0 * noise_level * slider2;
|
|
//spl1 = spl1 * (1.0 - slider2) + z1 * noise_level * slider2;
|
|
|
|
sum += z0;
|
|
sum2 += z0 * z0;
|
|
|
|
i += 1;
|
|
(i == srate) ? (
|
|
mean = sum / srate;
|
|
stdev = sqrt(sum2 / srate - mean * mean);
|
|
slider4 = mean;
|
|
slider5 = stdev;
|
|
sliderchange(2^4 + 2^5);
|
|
i = sum = sum2 = 0;
|
|
);
|
|
|
|
|