paex_pink.c File Reference

Generate Pink Noise using Gardner method. More...

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

Data Structures
struct	PinkNoise
struct	paTestData

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

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

Variables
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
       x

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

Author

Phil Burk http://www.softsynth.com

Macro Definition Documentation

#define PINK_MAX_RANDOM_ROWS   (30)

#define PINK_MEASURE

#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