#include <gr_iir_filter_ffd.h>
Inheritance diagram for gr_iir_filter_ffd:
This filter uses the Direct Form I implementation, where fftaps contains the feed-forward taps, and fbtaps the feedback ones.
fftaps and fbtaps must have equal numbers of taps
The input and output satisfy a difference equation of the form
![\[ y[n] - \sum_{k=1}^{N} a_k y[n-k] = \sum_{k=0}^{M} b_k x[n-k] \]](form_0.png)
with the corresponding rational system function
![\[ H(z) = \frac{\sum_{k=0}^{M} b_k z^{-k}}{1 - \sum_{k=1}^{N} a_k z^{-k}} \]](form_1.png)
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.
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_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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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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1.4.1