gr_freq_xlating_fir_filter_ccf Class Reference
[Filters]

#include <gr_freq_xlating_fir_filter_ccf.h>

Inheritance diagram for gr_freq_xlating_fir_filter_ccf:

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Collaboration diagram for gr_freq_xlating_fir_filter_ccf:

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List of all members.


Detailed Description

FIR filter combined with frequency translation with gr_complex input, gr_complex output and float taps

This class efficiently combines a frequency translation (typically "down conversion") with a FIR filter (typically low-pass) and decimation. It is ideally suited for a "channel selection filter" and can be efficiently used to select and decimate a narrow band signal out of wide bandwidth input.

Uses a single input array to produce a single output array. Additional inputs and/or outputs are ignored.

Public Member Functions

virtual ~gr_freq_xlating_fir_filter_ccf ()
void set_center_freq (double center_freq)
void set_taps (const std::vector< float > &taps)
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

Protected Member Functions

virtual void build_composite_fir ()
 gr_freq_xlating_fir_filter_ccf (int decimation, const std::vector< float > &taps, double center_freq, double sampling_freq)

Protected Attributes

std::vector< float > d_proto_taps
gr_fir_cccd_composite_fir
gr_rotator d_r
double d_center_freq
double d_sampling_freq
bool d_updated

Friends

gr_freq_xlating_fir_filter_ccf_sptr gr_make_freq_xlating_fir_filter_ccf (int decimation, const std::vector< float > &taps, double center_freq, double sampling_freq)


Constructor & Destructor Documentation

gr_freq_xlating_fir_filter_ccf::~gr_freq_xlating_fir_filter_ccf (  )  [virtual]

References d_composite_fir.

gr_freq_xlating_fir_filter_ccf::gr_freq_xlating_fir_filter_ccf ( int  decimation,
const std::vector< float > &  taps,
double  center_freq,
double  sampling_freq 
) [protected]

Construct a FIR filter with the given taps and a composite frequency translation that shifts center_freq down to zero Hz. The frequency translation logically comes before the filtering operation.

References build_composite_fir(), gr_fir_util::create_gr_fir_ccc(), d_composite_fir, d_proto_taps, and gr_block::set_history().


Member Function Documentation

void gr_freq_xlating_fir_filter_ccf::set_center_freq ( double  center_freq  ) 

References d_center_freq, and d_updated.

void gr_freq_xlating_fir_filter_ccf::set_taps ( const std::vector< float > &  taps  ) 

References d_proto_taps, and d_updated.

int gr_freq_xlating_fir_filter_ccf::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.

References build_composite_fir(), d_composite_fir, d_proto_taps, d_r, d_updated, gr_sync_decimator::decimation(), gr_fir_ccc::filter(), gr_rotator::rotate(), and gr_block::set_history().

void gr_freq_xlating_fir_filter_ccf::build_composite_fir (  )  [protected, virtual]


Friends And Related Function Documentation

gr_freq_xlating_fir_filter_ccf_sptr gr_make_freq_xlating_fir_filter_ccf ( int  decimation,
const std::vector< float > &  taps,
double  center_freq,
double  sampling_freq 
) [friend]

Construct a FIR filter with the given taps and a composite frequency translation that shifts center_freq down to zero Hz. The frequency translation logically comes before the filtering operation.


Member Data Documentation

Referenced by build_composite_fir(), and work().

Referenced by build_composite_fir().

Referenced by set_center_freq(), set_taps(), and work().


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

Generated on Thu Mar 27 14:46:54 2008 for GNU Radio 3.1.1 by  doxygen 1.5.5