GNU Radio's FILTER_AVX2 Package
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<+description of block+> More...
#include <pfb_channelizer_ccf.h>
Public Types | |
typedef boost::shared_ptr < pfb_channelizer_ccf > | sptr |
Public Member Functions | |
virtual void | set_taps (const std::vector< float > &taps)=0 |
virtual void | print_taps ()=0 |
virtual std::vector < std::vector< float > > | taps () const =0 |
virtual void | set_channel_map (const std::vector< int > &map)=0 |
virtual std::vector< int > | channel_map () const =0 |
Static Public Member Functions | |
static sptr | make (unsigned int numchans, const std::vector< float > &taps, float oversample_rate) |
<+description of block+>
typedef boost::shared_ptr<pfb_channelizer_ccf> gr::filter_avx2::pfb_channelizer_ccf::sptr |
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pure virtual |
Gets the current channel map.
Implemented in gr::filter_avx2::pfb_channelizer_ccf_impl.
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static |
Build the polyphase filterbank decimator.
numchans | (unsigned integer) Specifies the number of channels M |
taps | (vector/list of floats) The prototype filter to populate the filterbank. |
oversample_rate | (float) The over sampling rate is the ratio of the the actual output sampling rate to the normal output sampling rate. It must be rationally related to the number of channels as N/i for i in [1,N], which gives an outputsample rate of [fs/N, fs] where fs is the input sample rate and N is the number of channels. |
For example, for 6 channels with fs = 6000 Hz, the normal rateis 6000/6 = 1000 Hz. Allowable oversampling rates are 6/6, 6/5, 6/4, 6/3, 6/2, and 6/1 where the output sample rate of a 6/1 oversample ratio is 6000 Hz, or 6 times the normal 1000 Hz.
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pure virtual |
Print all of the filterbank taps to screen.
Implemented in gr::filter_avx2::pfb_channelizer_ccf_impl.
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pure virtual |
Set the channel map. Channels are numbers as:
N/2+1 | ... | N-1 | 0 | 1 | 2 | ... | N/2
<----------------— 0 -----------------—> freq
So output stream 0 comes from channel 0, etc. Setting a new channel map allows the user to specify which channel in frequency he/she wants to got to which output stream.
The map should have the same number of elements as the number of output connections from the block. The minimum value of the map is 0 (for the 0th channel) and the maximum number is N-1 where N is the number of channels.
We specify M as the number of output connections made where M <= N, so only M out of N channels are driven to an output stream. The number of items in the channel map should be at least M long. If there are more channels specified, any value in the map over M-1 will be ignored. If the size of the map is less than M the behavior is unknown (we don't wish to check every entry into the work function).
This means that if the channelizer is splitting the signal up into N channels but only M channels are specified in the map (where M <= N), then M output streams must be connected and the map and the channel numbers used must be less than N-1. Output channel number can be reused, too. By default, the map is [0...M-1] with M = N.
Implemented in gr::filter_avx2::pfb_channelizer_ccf_impl.
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pure virtual |
Resets the filterbank's filter taps with the new prototype filter
taps | (vector/list of floats) The prototype filter to populate the filterbank. |
Implemented in gr::filter_avx2::pfb_channelizer_ccf_impl.
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pure virtual |
Return a vector<vector<>> of the filterbank taps
Implemented in gr::filter_avx2::pfb_channelizer_ccf_impl.