filter.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "vcsbeam.h"
#include "gpu_macros.h"

Include dependency graph for filter.c:

Functions
gpuDoubleComplex *	roots_of_unity (int N)
	Calculates complex roots of unity. More...
void	vmLoadFilter (vcsbeam_context *vm, char *filtername, filter_type type, int nchans)
	Load a set of filter coefficients. More...
void	vmScaleFilterCoeffs (vcsbeam_context *vm, filter_type type, double scale_factor)
	Scale the filter coefficients by constant factor. More...
void	free_pfb_filter (pfb_filter *filter)
	Free the memory associated with a PFB filter. More...

Function Documentation

free_pfb_filter()

void free_pfb_filter

(

pfb_filter *

filter

)

Free the memory associated with a PFB filter.

Parameters

filter

The filter to be freed/

This function frees both the member variables and the filter itself.

roots_of_unity()

gpuDoubleComplex* roots_of_unity

(

int

N

)

Calculates complex roots of unity.

Parameters

N	The number of roots to calculate

Returns

A list of all complex numbers \(z\) such that \(z^N = 1\).

vmLoadFilter()

void vmLoadFilter	(	vcsbeam_context *	vm,
		char *	filtername,
		filter_type	type,
		int	nchans
	)

Load a set of filter coefficients.

Parameters

vm	The VCSBeam context struct
filtername	String specifying a filter. There should be a corresponding file in the RUNTIME_DIR called <filtername>.dat.
type	Either ANALYSIS_FILTER or SYNTHESIS_FILTER
nchans	The number of channels that this filter will be applied to. For both ANALYSIS and SYNTHESIS filters, this should be the number of ANALYSIS channels.

Todo:

Change nchans so that it uses vm→nfine_chans

vmScaleFilterCoeffs()

void vmScaleFilterCoeffs	(	vcsbeam_context *	vm,
		filter_type	type,
		double	scale_factor
	)

Scale the filter coefficients by constant factor.

Parameters

vm	The VCSBeam context struct
type	Either ANALYSIS_FILTER or SYNTHESIS_FILTER
scale_factor	The scaling factor