gr::filter::fft_filter_ccc Class Reference

Fast FFT filter with gr_complex input, gr_complex output and gr_complex taps. More...

#include <fft_filter_ccc.h>

Inheritance diagram for gr::filter::fft_filter_ccc:

List of all members.

Public Types
typedef boost::shared_ptr < fft_filter_ccc >	sptr
Public Member Functions
virtual void	set_taps (const std::vector< gr_complex > &taps)=0
virtual std::vector< gr_complex >	taps () const =0
virtual void	set_nthreads (int n)=0
	Set number of threads to use.
virtual int	nthreads () const =0
	Get number of threads being used.
Static Public Member Functions
static sptr	make (int decimation, const std::vector< gr_complex > &taps, int nthreads=1)

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Detailed Description

Fast FFT filter with gr_complex input, gr_complex output and gr_complex taps.

This block implements a complex decimating filter using the fast convolution method via an FFT. The decimation factor is an interger that is greater than or equal to 1.

The filter takes a set of complex (or real) taps to use in the filtering operation. These taps can be defined as anything that satisfies the user's filtering needs. For standard filters such as lowpass, highpass, bandpass, etc., the filter.firdes and filter.optfir classes provide convenient generating methods.

This filter is implemented by using the FFTW package to perform the required FFTs. An optional argument, nthreads, may be passed to the constructor (or set using the set_nthreads member function) to split the FFT among N number of threads. This can improve performance on very large FFTs (that is, if the number of taps used is very large) if you have enough threads/cores to support it.

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Member Typedef Documentation

typedef boost::shared_ptr<fft_filter_ccc> gr::filter::fft_filter_ccc::sptr

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Member Function Documentation

static sptr gr::filter::fft_filter_ccc::make	(	int	decimation,
		const std::vector< gr_complex > &	taps,
		int	nthreads = 1
	)		[static]

Build an FFT filter blocks.

Parameters:

decimation	>= 1
taps	complex filter taps
nthreads	number of threads for the FFT to use

virtual int gr::filter::fft_filter_ccc::nthreads

(

)

const [pure virtual]

Get number of threads being used.

Implemented in gr::filter::fft_filter_ccc_impl.

virtual void gr::filter::fft_filter_ccc::set_nthreads

(

int

n

)

[pure virtual]

Set number of threads to use.

Implemented in gr::filter::fft_filter_ccc_impl.

virtual void gr::filter::fft_filter_ccc::set_taps

(

const std::vector< gr_complex > &

taps

)

[pure virtual]

Implemented in gr::filter::fft_filter_ccc_impl.

virtual std::vector<gr_complex> gr::filter::fft_filter_ccc::taps

(

)

const [pure virtual]

Implemented in gr::filter::fft_filter_ccc_impl.

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The documentation for this class was generated from the following file:

• fft_filter_ccc.h