libdspau-filters.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "libdspau.h"

Include dependency graph for libdspau-filters.c:

Classes
struct	Coefficient

Functions
int	dspau_squarelawfilter (double *in, double *out, int len)
	A square law filter. More...
int	dspau_lowpassfilter (double *in, double *out, int len, double SamplingFrequency, double Frequency, double Q)
	A low pass filter. More...
int	dspau_highpassfilter (double *in, double *out, int len, double SamplingFrequency, double Frequency, double Q)
	A high pass filter. More...
double	dspau_singlefilter (double yin, struct Coefficient *coefficient)
int	dspau_bandrejectfilter (double *in, double *out, int len, double SamplingFrequency, double Frequency, double Q)
	A band reject filter. More...
int	dspau_bandpassfilter (double *in, double *out, int len, double SamplingFrequency, double Frequency, double Q)
	A band pass filter. More...

Function Documentation

dspau_bandpassfilter()

int dspau_bandpassfilter	(	double *	in,
		double *	out,
		int	len,
		double	samplingfrequency,
		double	frequency,
		double	q
	)

A band pass filter.

Parameters

in	the input stream. (input)
out	the output stream. (output)
len	the length of the input stream.
samplingfrequency	the sampling frequency of the input stream.
frequency	the center frequency of the filter.
q	the cutoff slope.

Returns

the output stream if successfull elaboration. NULL if an error is encountered. Return 0 if success. Return -1 if any error occurs.

dspau_bandrejectfilter()

int dspau_bandrejectfilter	(	double *	in,
		double *	out,
		int	len,
		double	samplingfrequency,
		double	frequency,
		double	q
	)

A band reject filter.

Parameters

in	the input stream. (input)
out	the output stream. (output)
len	the length of the input stream.
samplingfrequency	the sampling frequency of the input stream.
frequency	the center frequency of the filter.
q	the cutoff slope.

Returns

the output stream if successfull elaboration. NULL if an error is encountered. Return 0 if success. Return -1 if any error occurs.

dspau_highpassfilter()

int dspau_highpassfilter	(	double *	in,
		double *	out,
		int	len,
		double	samplingfrequency,
		double	frequency,
		double	q
	)

A high pass filter.

Parameters

in	the input stream. (input)
out	the output stream. (output)
len	the length of the input stream.
samplingfrequency	the sampling frequency of the input stream.
frequency	the cutoff frequency of the filter.
q	the cutoff slope.

Returns

the output stream if successfull elaboration. NULL if an error is encountered. Return 0 if success. Return -1 if any error occurs.

dspau_lowpassfilter()

int dspau_lowpassfilter	(	double *	in,
		double *	out,
		int	len,
		double	samplingfrequency,
		double	frequency,
		double	q
	)

A low pass filter.

Parameters

in	the input stream. (input)
out	the output stream. (output)
len	the length of the input stream.
samplingfrequency	the sampling frequency of the input stream.
frequency	the cutoff frequency of the filter.
q	the cutoff slope.

Returns

the output stream if successfull elaboration. NULL if an error is encountered. Return 0 if success. Return -1 if any error occurs.

dspau_singlefilter()

double dspau_singlefilter	(	double	yin,
		struct Coefficient *	coefficient
	)

dspau_squarelawfilter()

int dspau_squarelawfilter	(	double *	in,
		double *	out,
		int	len
	)

A square law filter.

Parameters

in	the input stream. (input)
out	the output stream. (output)
len	the length of the input stream.

Returns

the output stream if successfull elaboration. NULL if an error is encountered. Return 0 if success. Return -1 if any error occurs.