PortAudio  2.0
Data Structures | Macros | Functions | Variables

Generate Pink Noise using Gardner method. More...

#include <stdio.h>
#include <math.h>
#include "portaudio.h"

Data Structures

struct  PinkNoise
struct  paTestData


#define PINK_MAX_RANDOM_ROWS   (30)
#define PINK_RANDOM_BITS   (24)
#define PINK_RANDOM_SHIFT   ((sizeof(long)*8)-PINK_RANDOM_BITS)
#define PINK_TEST


void InitializePinkNoise (PinkNoise *pink, int numRows)
float GeneratePinkNoise (PinkNoise *pink)
int main (void)


float pinkMax = -999.0
float pinkMin = 999.0

Detailed Description

Generate Pink Noise using Gardner method.

    Optimization suggested by James McCartney uses a tree
    to select which random value to replace.
        x x x x x x x x x x x x x x x x 
        x   x   x   x   x   x   x   x   
        x       x       x       x       
         x               x               

Tree is generated by counting trailing zeros in an increasing index. When the index is zero, no random number is selected.

Phil Burk http://www.softsynth.com

Macro Definition Documentation

#define PINK_MAX_RANDOM_ROWS   (30)
#define PINK_RANDOM_BITS   (24)
#define PINK_RANDOM_SHIFT   ((sizeof(long)*8)-PINK_RANDOM_BITS)
#define PINK_TEST

Function Documentation

float GeneratePinkNoise ( PinkNoise pink)
void InitializePinkNoise ( PinkNoise pink,
int  numRows 
int main ( void  )

Variable Documentation

float pinkMax = -999.0
float pinkMin = 999.0