GNU Radio 3.6.4.1 C++ API
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IIR filter with float input, float output and double tapsThis filter uses the Direct Form I implementation, where fftaps
contains the feed-forward taps, and fbtaps
the feedback ones.
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#include <gr_iir_filter_ffd.h>
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 | |
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void | forecast (int noutput_items, gr_vector_int &ninput_items_required) |
Estimate input requirements given output request. | |
int | general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) |
compute output items from input items | |
int | fixed_rate_ninput_to_noutput (int ninput) |
Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. | |
int | fixed_rate_noutput_to_ninput (int noutput) |
Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. | |
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virtual | ~gr_block () |
unsigned | history () const |
void | set_history (unsigned history) |
bool | fixed_rate () const |
Return true if this block has a fixed input to output rate. | |
virtual bool | start () |
Called to enable drivers, etc for i/o devices. | |
virtual bool | stop () |
Called to disable drivers, etc for i/o devices. | |
void | set_output_multiple (int multiple) |
Constrain the noutput_items argument passed to forecast and general_work. | |
int | output_multiple () const |
bool | output_multiple_set () const |
void | set_alignment (int multiple) |
Constrains buffers to work on a set item alignment (for SIMD) | |
int | alignment () const |
void | set_unaligned (int na) |
int | unaligned () const |
void | set_is_unaligned (bool u) |
bool | is_unaligned () const |
void | consume (int which_input, int how_many_items) |
Tell the scheduler how_many_items of input stream which_input were consumed. | |
void | consume_each (int how_many_items) |
Tell the scheduler how_many_items were consumed on each input stream. | |
void | produce (int which_output, int how_many_items) |
Tell the scheduler how_many_items were produced on output stream which_output . | |
void | set_relative_rate (double relative_rate) |
Set the approximate output rate / input rate. | |
double | relative_rate () const |
return the approximate output rate / input rate | |
uint64_t | nitems_read (unsigned int which_input) |
Return the number of items read on input stream which_input. | |
uint64_t | nitems_written (unsigned int which_output) |
Return the number of items written on output stream which_output. | |
tag_propagation_policy_t | tag_propagation_policy () |
Asks for the policy used by the scheduler to moved tags downstream. | |
void | set_tag_propagation_policy (tag_propagation_policy_t p) |
Set the policy by the scheduler to determine how tags are moved downstream. | |
int | min_noutput_items () const |
Return the minimum number of output items this block can produce during a call to work. | |
void | set_min_noutput_items (int m) |
Set the minimum number of output items this block can produce during a call to work. | |
int | max_noutput_items () |
Return the maximum number of output items this block will handle during a call to work. | |
void | set_max_noutput_items (int m) |
Set the maximum number of output items this block will handle during a call to work. | |
void | unset_max_noutput_items () |
Clear the switch for using the max_noutput_items value of this block. | |
bool | is_set_max_noutput_items () |
Ask the block if the flag is or is not set to use the internal value of max_noutput_items during a call to work. | |
void | expand_minmax_buffer (int port) |
long | max_output_buffer (size_t i) |
Returns max buffer size on output port i . | |
void | set_max_output_buffer (long max_output_buffer) |
Sets max buffer size on all output ports. | |
void | set_max_output_buffer (int port, long max_output_buffer) |
Sets max buffer size on output port port . | |
long | min_output_buffer (size_t i) |
Returns min buffer size on output port i . | |
void | set_min_output_buffer (long min_output_buffer) |
Sets min buffer size on all output ports. | |
void | set_min_output_buffer (int port, long min_output_buffer) |
Sets min buffer size on output port port . | |
float | pc_noutput_items () |
Gets average noutput_items performance counter. | |
float | pc_noutput_items_var () |
Gets variance of noutput_items performance counter. | |
float | pc_nproduced () |
Gets average num items produced performance counter. | |
float | pc_nproduced_var () |
Gets variance of num items produced performance counter. | |
float | pc_input_buffers_full (int which) |
Gets average fullness of which input buffer. | |
float | pc_input_buffers_full_var (int which) |
Gets variance of fullness of which input buffer. | |
std::vector< float > | pc_input_buffers_full () |
Gets average fullness of all input buffers. | |
std::vector< float > | pc_input_buffers_full_var () |
Gets variance of fullness of all input buffers. | |
float | pc_output_buffers_full (int which) |
Gets average fullness of which input buffer. | |
float | pc_output_buffers_full_var (int which) |
Gets variance of fullness of which input buffer. | |
std::vector< float > | pc_output_buffers_full () |
Gets average fullness of all output buffers. | |
std::vector< float > | pc_output_buffers_full_var () |
Gets variance of fullness of all output buffers. | |
float | pc_work_time () |
Gets average clock cycles spent in work. | |
float | pc_work_time_var () |
Gets average clock cycles spent in work. | |
void | reset_perf_counters () |
Resets the performance counters. | |
void | set_processor_affinity (const std::vector< unsigned int > &mask) |
Set the thread's affinity to processor core n . | |
void | unset_processor_affinity () |
Remove processor affinity to a specific core. | |
std::vector< unsigned int > | processor_affinity () |
Get the current processor affinity. | |
gr_block_detail_sptr | detail () const |
void | set_detail (gr_block_detail_sptr detail) |
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virtual | ~gr_basic_block () |
long | unique_id () const |
long | symbolic_id () const |
std::string | name () const |
std::string | symbol_name () const |
gr_io_signature_sptr | input_signature () const |
gr_io_signature_sptr | output_signature () const |
gr_basic_block_sptr | to_basic_block () |
bool | alias_set () |
std::string | alias () |
pmt::pmt_t | alias_pmt () |
void | set_block_alias (std::string name) |
void | message_port_register_in (pmt::pmt_t port_id) |
void | message_port_register_out (pmt::pmt_t port_id) |
void | message_port_pub (pmt::pmt_t port_id, pmt::pmt_t msg) |
void | message_port_sub (pmt::pmt_t port_id, pmt::pmt_t target) |
void | message_port_unsub (pmt::pmt_t port_id, pmt::pmt_t target) |
virtual bool | message_port_is_hier (pmt::pmt_t port_id) |
virtual bool | message_port_is_hier_in (pmt::pmt_t port_id) |
virtual bool | message_port_is_hier_out (pmt::pmt_t port_id) |
pmt::pmt_t | message_ports_in () |
Get input message port names. | |
pmt::pmt_t | message_ports_out () |
Get output message port names. | |
void | _post (pmt::pmt_t which_port, pmt::pmt_t msg) |
bool | empty_p (pmt::pmt_t which_port) |
is the queue empty? | |
bool | empty_p () |
size_t | nmsgs (pmt::pmt_t which_port) |
How many messages in the queue? | |
void | insert_tail (pmt::pmt_t which_port, pmt::pmt_t msg) |
pmt::pmt_t | delete_head_nowait (pmt::pmt_t which_port) |
pmt::pmt_t | delete_head_blocking (pmt::pmt_t which_port) |
msg_queue_t::iterator | get_iterator (pmt::pmt_t which_port) |
void | erase_msg (pmt::pmt_t which_port, msg_queue_t::iterator it) |
virtual bool | has_msg_port (pmt::pmt_t which_port) |
virtual bool | check_topology (int ninputs, int noutputs) |
Confirm that ninputs and noutputs is an acceptable combination. | |
template<typename T > | |
void | set_msg_handler (pmt::pmt_t which_port, T msg_handler) |
Set the callback that is fired when messages are available. | |
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gr_msg_accepter () | |
~gr_msg_accepter () | |
void | post (pmt::pmt_t which_port, pmt::pmt_t msg) |
send msg to msg_accepter on port which_port | |
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msg_accepter () | |
virtual | ~msg_accepter () |
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) |
Additional Inherited Members | |
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gr_sync_block (void) | |
gr_sync_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature) | |
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gr_block (void) | |
gr_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature) | |
void | set_fixed_rate (bool fixed_rate) |
void | add_item_tag (unsigned int which_output, uint64_t abs_offset, const pmt::pmt_t &key, const pmt::pmt_t &value, const pmt::pmt_t &srcid=pmt::PMT_F) |
Adds a new tag onto the given output buffer. | |
void | add_item_tag (unsigned int which_output, const gr_tag_t &tag) |
Adds a new tag onto the given output buffer. | |
void | remove_item_tag (unsigned int which_input, uint64_t abs_offset, const pmt::pmt_t &key, const pmt::pmt_t &value, const pmt::pmt_t &srcid=pmt::PMT_F) |
Removes a tag from the given input buffer. | |
void | remove_item_tag (unsigned int which_input, const gr_tag_t &tag) |
Removes a tag from the given input buffer. | |
void | get_tags_in_range (std::vector< gr_tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end) |
Given a [start,end), returns a vector of all tags in the range. | |
void | get_tags_in_range (std::vector< gr_tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end, const pmt::pmt_t &key) |
Given a [start,end), returns a vector of all tags in the range with a given key. | |
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gr_basic_block (void) | |
gr_basic_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature) | |
Protected constructor prevents instantiation by non-derived classes. | |
void | set_input_signature (gr_io_signature_sptr iosig) |
may only be called during constructor | |
void | set_output_signature (gr_io_signature_sptr iosig) |
may only be called during constructor | |
void | set_color (vcolor color) |
Allow the flowgraph to set for sorting and partitioning. | |
vcolor | color () const |
bool | has_msg_handler (pmt::pmt_t which_port) |
Tests if there is a handler attached to port which_port . | |
virtual void | dispatch_msg (pmt::pmt_t which_port, pmt::pmt_t msg) |
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.
gr_iir_filter_ffd::~gr_iir_filter_ffd | ( | ) |
void gr_iir_filter_ffd::set_taps | ( | const std::vector< double > & | fftaps, |
const std::vector< double > & | fbtaps | ||
) | throw (std::invalid_argument) |
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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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friend |