gr_iir_filter_ffd Class Reference

IIR filter with float input, float output and double taps. More...

#include <gr_iir_filter_ffd.h>

Inheritance diagram for gr_iir_filter_ffd:

List of all members.

Public Member Functions
	~gr_iir_filter_ffd ()
void	set_taps (const std::vector< double > &fftaps, const std::vector< double > &fbtaps) throw (std::invalid_argument)
int	work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
	just like gr_block::general_work, only this arranges to call consume_each for you
Friends
GR_CORE_API gr_iir_filter_ffd_sptr	gr_make_iir_filter_ffd (const std::vector< double > &fftaps, const std::vector< double > &fbtaps) throw (std::invalid_argument)

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Detailed Description

IIR filter with float input, float output and double taps.

This filter uses the Direct Form I implementation, where fftaps contains the feed-forward taps, and fbtaps the feedback ones.

The input and output satisfy a difference equation of the form \f{ y[n] - \sum_{k=1}^{M} a_k y[n-k] = \sum_{k=0}^{N} b_k x[n-k] \f}

with the corresponding rational system function \f{ H(z) = \ frac{\sum_{k=0}^{M} b_k z^{-k}}{1 - \sum_{k=1}^{N} a_k z^{-k}} \f}

Note that some texts define the system function with a + in the denominator. If you're using that convention, you'll need to negate the feedback taps.

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Constructor & Destructor Documentation

gr_iir_filter_ffd::~gr_iir_filter_ffd

(

)

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Member Function Documentation

void gr_iir_filter_ffd::set_taps	(	const std::vector< double > &	fftaps,
		const std::vector< double > &	fbtaps
	)		throw (std::invalid_argument)

int gr_iir_filter_ffd::work	(	int	noutput_items,
		gr_vector_const_void_star &	input_items,
		gr_vector_void_star &	output_items
	)		[virtual]

just like gr_block::general_work, only this arranges to call consume_each for you

The user must override work to define the signal processing code

Implements gr_sync_block.

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Friends And Related Function Documentation

GR_CORE_API gr_iir_filter_ffd_sptr gr_make_iir_filter_ffd	(	const std::vector< double > &	fftaps,
		const std::vector< double > &	fbtaps
	)		throw (std::invalid_argument) [friend]

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

• gr_iir_filter_ffd.h