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Removes cic cleanup filter from processing chain.
This commit is contained in:
Denny
@@ -1,408 +1,412 @@
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2015 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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* sdrtrunk
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* Copyright (C) 2014-2017 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
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*
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||||
* This program is distributed in the hope that it will be useful,
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||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||||
* GNU General Public License for more details.
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||||
*
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* You should have received a copy of the GNU General Public License
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||||
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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******************************************************************************/
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package dsp.filter.cic;
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import java.util.ArrayList;
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import java.util.List;
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import dsp.filter.FilterFactory;
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import dsp.filter.Filters;
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import dsp.filter.Window.WindowType;
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import dsp.filter.fir.complex.ComplexFIRFilter_CB_CB;
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import dsp.filter.halfband.complex.HalfBandFilter_CB_CB;
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import org.apache.commons.lang3.Validate;
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import sample.Listener;
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import sample.complex.ComplexBuffer;
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import sample.complex.ComplexSampleListener;
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import sample.complex.ComplexToComplexBufferAssembler;
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import sample.decimator.ComplexDecimator;
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import dsp.filter.FilterFactory;
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import dsp.filter.Filters;
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import dsp.filter.Window.WindowType;
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import dsp.filter.fir.complex.ComplexFIRFilter_CB_CB;
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import dsp.filter.halfband.complex.HalfBandFilter_CB_CB;
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import java.util.ArrayList;
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import java.util.List;
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public class ComplexPrimeCICDecimate implements Listener<ComplexBuffer>
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{
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public static int[] PRIMES = { 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,
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59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,
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157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,
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257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,
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367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,
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467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,
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599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691 };
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private ArrayList<DecimatingStage> mDecimatingStages =
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new ArrayList<DecimatingStage>();
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private DecimatingStage mFirstDecimatingStage;
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public static int[] PRIMES = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53,
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59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
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157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251,
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257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359,
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367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463,
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467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593,
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599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691};
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private Output mOutput;
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private ArrayList<DecimatingStage> mDecimatingStages =
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new ArrayList<DecimatingStage>();
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/**
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* Non-Recursive Prime-Factor CIC Filter with float sample array inputs and
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* decimated, single paired i/q float sample output.
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*
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* Implements the CIC filter described in Understanding Digital Signal
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* Processing, 3e, Lyons, on page 769. This filter is comprised of multiple
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* decimating stages each with a prime factor decimation rate. Multiple
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* stages are cascaded to achieve the overall decimation rate.
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*
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* This filter supports a maximum decimation rate of 700. This filter can
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* be adapted to higher decimation rates by adding additional prime factors
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* to the PRIMES array.
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*
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* @param decimation - overall decimation rate
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* @param order - filter order
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*/
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public ComplexPrimeCICDecimate( int decimation, int order,
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int passFrequency, int attenuation, WindowType windowType )
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{
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Validate.isTrue(decimation <= 700);
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private DecimatingStage mFirstDecimatingStage;
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List<Integer> stageSizes = getPrimeFactors( decimation );
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for( int x = 0; x < stageSizes.size(); x++ )
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{
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DecimatingStage stage = new DecimatingStage( stageSizes.get( x ), order );
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mDecimatingStages.add( stage );
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if( x == 0 )
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{
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/* Reference to first stage -- will receive all samples */
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mFirstDecimatingStage = stage;
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}
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else
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{
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/* Wire the current stage to the previous stage */
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mDecimatingStages.get( x - 1 ).setListener( stage );
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}
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}
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mOutput = new Output( 48000, passFrequency, attenuation, windowType );
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mDecimatingStages.get( mDecimatingStages.size() - 1 )
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.setListener( mOutput );
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}
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public void dispose()
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{
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for( DecimatingStage stage: mDecimatingStages )
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{
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stage.dispose();
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}
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mDecimatingStages.clear();
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mDecimatingStages = null;
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mFirstDecimatingStage = null;
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mOutput.dispose();
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mOutput = null;
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}
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/**
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* Adds a listener to receive the output of this CIC decimation filter
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*/
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public void setListener( Listener<ComplexBuffer> listener )
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{
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mOutput.setListener( listener );
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}
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/**
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* Removes listener from output of this CIC decimation filter
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*/
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public void removeListener()
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{
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mOutput.removeListener();
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}
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private Output mOutput;
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/**
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* Calculates the prime factors of the decimation rate up to a maximum
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* decimation rate of 700. If you wish to have decimation rates higher
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* than 700, then add additional prime factors to the PRIMES array.
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*
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* @param decimation - integral decimation rate
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* @return - ordered list (smallest to largest) of prime factors
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*/
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public static List<Integer> getPrimeFactors( int decimation )
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{
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ArrayList<Integer> stages = new ArrayList<Integer>();
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int pointer = 0;
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while( decimation > 0 && pointer < PRIMES.length )
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{
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int prime = PRIMES[ pointer ];
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if( decimation % prime == 0 )
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{
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stages.add( prime );
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decimation /= prime;
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}
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else
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{
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pointer++;
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}
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}
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return stages;
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}
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/**
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* Primary input method for receiving sample arrays composed as I,Q,I,Q, etc.
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*/
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@Override
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public void receive( ComplexBuffer buffer )
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/**
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* Non-Recursive Prime-Factor CIC Filter with float sample array inputs and
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* decimated, single paired i/q float sample output.
|
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*
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* Implements the CIC filter described in Understanding Digital Signal
|
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* Processing, 3e, Lyons, on page 769. This filter is comprised of multiple
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* decimating stages each with a prime factor decimation rate. Multiple
|
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* stages are cascaded to achieve the overall decimation rate.
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*
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* This filter supports a maximum decimation rate of 700. This filter can
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* be adapted to higher decimation rates by adding additional prime factors
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* to the PRIMES array.
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*
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* @param decimation - overall decimation rate
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* @param order - filter order
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*/
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public ComplexPrimeCICDecimate(int decimation, int order,
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int passFrequency, int attenuation, WindowType windowType)
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{
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if( mFirstDecimatingStage != null )
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{
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float[] samples = buffer.getSamples();
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for( int x = 0; x < samples.length; x += 2 )
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{
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mFirstDecimatingStage.receive( samples[ x ], samples[ x + 1 ] );
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}
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}
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}
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/**
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* Decimating stage combines multiple CIC stages with a decimator. The
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* number of stages is indicated by the order value and the size indicates
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* the decimation rate of this stage.
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*/
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public class DecimatingStage implements ComplexSampleListener
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{
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private ArrayList<Stage> mStages = new ArrayList<Stage>();
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private Stage mFirstStage;
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private ComplexDecimator mDecimator;
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public DecimatingStage( int size, int order )
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{
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for( int x = 0; x < order; x++ )
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{
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Stage stage;
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if( size == 2 )
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{
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stage = new TwoStage();
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}
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else
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{
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stage = new Stage( size );
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}
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mStages.add( stage );
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if( x == 0 )
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{
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mFirstStage = stage;
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}
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else
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{
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mStages.get( x - 1 ).setListener( stage );
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}
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}
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mDecimator = new ComplexDecimator( size );
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mStages.get( mStages.size() - 1 ).setListener( mDecimator );
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}
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public void dispose()
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{
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for( Stage stage: mStages )
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{
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stage.dispose();
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}
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mStages.clear();
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mDecimator.dispose();
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mDecimator = null;
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mFirstStage = null;
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mStages = null;
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}
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Validate.isTrue(decimation <= 700);
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@Override
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public void receive( float i, float q )
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List<Integer> stageSizes = getPrimeFactors(decimation);
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for(int x = 0; x < stageSizes.size(); x++)
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{
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mFirstStage.receive( i, q );
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}
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public void setListener( ComplexSampleListener listener )
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{
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mDecimator.setListener( listener );
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}
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}
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/**
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* Single non-decimating CIC stage component. Uses a circular buffer and a
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* running average internally to implement the stage so that stage size has
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* essentially no impact on the computational requirements of the stage
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*/
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public class Stage implements ComplexSampleListener
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{
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protected ComplexSampleListener mListener;
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private float[] mISamples;
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private float[] mQSamples;
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protected float mISum;
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protected float mQSum;
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private int mSamplePointer = 0;
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private int mSize;
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protected float mGain;
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public Stage()
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{
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}
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DecimatingStage stage = new DecimatingStage(stageSizes.get(x), order);
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public Stage( int size )
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{
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mSize = size - 1;
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mISamples = new float[ mSize ];
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mQSamples = new float[ mSize ];
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mGain = 1.0f / (float)size;
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}
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public void dispose()
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{
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mListener = null;
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}
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public void receive( float i, float q )
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{
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mDecimatingStages.add(stage);
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if(x == 0)
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{
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/* Reference to first stage -- will receive all samples */
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mFirstDecimatingStage = stage;
|
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}
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else
|
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{
|
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/* Wire the current stage to the previous stage */
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mDecimatingStages.get(x - 1).setListener(stage);
|
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}
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}
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mOutput = new Output(48000, passFrequency, attenuation, windowType);
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mDecimatingStages.get(mDecimatingStages.size() - 1)
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.setListener(mOutput);
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}
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|
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public void dispose()
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{
|
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for(DecimatingStage stage : mDecimatingStages)
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{
|
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stage.dispose();
|
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}
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|
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mDecimatingStages.clear();
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mDecimatingStages = null;
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mFirstDecimatingStage = null;
|
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|
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mOutput.dispose();
|
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mOutput = null;
|
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}
|
||||
|
||||
/**
|
||||
* Adds a listener to receive the output of this CIC decimation filter
|
||||
*/
|
||||
public void setListener(Listener<ComplexBuffer> listener)
|
||||
{
|
||||
mOutput.setListener(listener);
|
||||
}
|
||||
|
||||
/**
|
||||
* Removes listener from output of this CIC decimation filter
|
||||
*/
|
||||
public void removeListener()
|
||||
{
|
||||
mOutput.removeListener();
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates the prime factors of the decimation rate up to a maximum
|
||||
* decimation rate of 700. If you wish to have decimation rates higher
|
||||
* than 700, then add additional prime factors to the PRIMES array.
|
||||
*
|
||||
* @param decimation - integral decimation rate
|
||||
* @return - ordered list (smallest to largest) of prime factors
|
||||
*/
|
||||
public static List<Integer> getPrimeFactors(int decimation)
|
||||
{
|
||||
ArrayList<Integer> stages = new ArrayList<Integer>();
|
||||
|
||||
int pointer = 0;
|
||||
|
||||
while(decimation > 0 && pointer < PRIMES.length)
|
||||
{
|
||||
int prime = PRIMES[pointer];
|
||||
|
||||
if(decimation % prime == 0)
|
||||
{
|
||||
stages.add(prime);
|
||||
|
||||
decimation /= prime;
|
||||
}
|
||||
else
|
||||
{
|
||||
pointer++;
|
||||
}
|
||||
}
|
||||
|
||||
return stages;
|
||||
}
|
||||
|
||||
/**
|
||||
* Primary input method for receiving sample arrays composed as I,Q,I,Q, etc.
|
||||
*/
|
||||
@Override
|
||||
public void receive(ComplexBuffer buffer)
|
||||
{
|
||||
if(mFirstDecimatingStage != null)
|
||||
{
|
||||
float[] samples = buffer.getSamples();
|
||||
|
||||
for(int x = 0; x < samples.length; x += 2)
|
||||
{
|
||||
mFirstDecimatingStage.receive(samples[x], samples[x + 1]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Decimating stage combines multiple CIC stages with a decimator. The
|
||||
* number of stages is indicated by the order value and the size indicates
|
||||
* the decimation rate of this stage.
|
||||
*/
|
||||
public class DecimatingStage implements ComplexSampleListener
|
||||
{
|
||||
private ArrayList<Stage> mStages = new ArrayList<Stage>();
|
||||
private Stage mFirstStage;
|
||||
private ComplexDecimator mDecimator;
|
||||
|
||||
public DecimatingStage(int size, int order)
|
||||
{
|
||||
for(int x = 0; x < order; x++)
|
||||
{
|
||||
Stage stage;
|
||||
|
||||
if(size == 2)
|
||||
{
|
||||
stage = new TwoStage();
|
||||
}
|
||||
else
|
||||
{
|
||||
stage = new Stage(size);
|
||||
}
|
||||
|
||||
mStages.add(stage);
|
||||
|
||||
if(x == 0)
|
||||
{
|
||||
mFirstStage = stage;
|
||||
}
|
||||
else
|
||||
{
|
||||
mStages.get(x - 1).setListener(stage);
|
||||
}
|
||||
}
|
||||
|
||||
mDecimator = new ComplexDecimator(size);
|
||||
|
||||
mStages.get(mStages.size() - 1).setListener(mDecimator);
|
||||
}
|
||||
|
||||
public void dispose()
|
||||
{
|
||||
for(Stage stage : mStages)
|
||||
{
|
||||
stage.dispose();
|
||||
}
|
||||
|
||||
mStages.clear();
|
||||
mDecimator.dispose();
|
||||
mDecimator = null;
|
||||
mFirstStage = null;
|
||||
mStages = null;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void receive(float i, float q)
|
||||
{
|
||||
mFirstStage.receive(i, q);
|
||||
}
|
||||
|
||||
public void setListener(ComplexSampleListener listener)
|
||||
{
|
||||
mDecimator.setListener(listener);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Single non-decimating CIC stage component. Uses a circular buffer and a
|
||||
* running average internally to implement the stage so that stage size has
|
||||
* essentially no impact on the computational requirements of the stage
|
||||
*/
|
||||
public class Stage implements ComplexSampleListener
|
||||
{
|
||||
protected ComplexSampleListener mListener;
|
||||
|
||||
private float[] mISamples;
|
||||
private float[] mQSamples;
|
||||
|
||||
protected float mISum;
|
||||
protected float mQSum;
|
||||
|
||||
private int mSamplePointer = 0;
|
||||
private int mSize;
|
||||
|
||||
protected float mGain;
|
||||
|
||||
public Stage()
|
||||
{
|
||||
}
|
||||
|
||||
public Stage(int size)
|
||||
{
|
||||
mSize = size - 1;
|
||||
|
||||
mISamples = new float[mSize];
|
||||
mQSamples = new float[mSize];
|
||||
|
||||
mGain = 1.0f / (float)size;
|
||||
}
|
||||
|
||||
public void dispose()
|
||||
{
|
||||
mListener = null;
|
||||
}
|
||||
|
||||
public void receive(float i, float q)
|
||||
{
|
||||
/* Subtract the oldest sample and add back in the newest */
|
||||
mISum = mISum - mISamples[ mSamplePointer ] + i;
|
||||
mQSum = mQSum - mQSamples[ mSamplePointer ] + q;
|
||||
mISum = mISum - mISamples[mSamplePointer] + i;
|
||||
mQSum = mQSum - mQSamples[mSamplePointer] + q;
|
||||
|
||||
/* Overwrite the oldest sample with the newest */
|
||||
mISamples[ mSamplePointer ] = i;
|
||||
mQSamples[ mSamplePointer ] = q;
|
||||
|
||||
mSamplePointer++;
|
||||
|
||||
if( mSamplePointer >= mSize )
|
||||
{
|
||||
mSamplePointer = 0;
|
||||
}
|
||||
mISamples[mSamplePointer] = i;
|
||||
mQSamples[mSamplePointer] = q;
|
||||
|
||||
if( mListener != null )
|
||||
{
|
||||
mListener.receive( ( mISum * mGain ), ( mQSum * mGain ) );
|
||||
}
|
||||
}
|
||||
|
||||
public void setListener( ComplexSampleListener listener )
|
||||
{
|
||||
mListener = listener;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Size 2 stage that removes the unnecessary circular buffer management for
|
||||
* a two-stage.
|
||||
*/
|
||||
public class TwoStage extends Stage
|
||||
{
|
||||
public TwoStage()
|
||||
{
|
||||
super();
|
||||
|
||||
mGain = 0.5f;
|
||||
}
|
||||
|
||||
public void receive( float i, float q )
|
||||
{
|
||||
float iSum = mISum + i;
|
||||
float qSum = mQSum + q;
|
||||
|
||||
mISum = i;
|
||||
mQSum = q;
|
||||
|
||||
if( mListener != null )
|
||||
{
|
||||
mListener.receive( ( iSum * mGain ), ( qSum * mGain ) );
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
mSamplePointer++;
|
||||
|
||||
/**
|
||||
* Output adapter - applies gain correction and cleanup filter and broadcast
|
||||
* to registered listener.
|
||||
*/
|
||||
public class Output implements ComplexSampleListener
|
||||
{
|
||||
/* Decimated output buffers will contain 1024 samples */
|
||||
private ComplexToComplexBufferAssembler mAssembler =
|
||||
new ComplexToComplexBufferAssembler( 2048 );
|
||||
if(mSamplePointer >= mSize)
|
||||
{
|
||||
mSamplePointer = 0;
|
||||
}
|
||||
|
||||
private ComplexFIRFilter_CB_CB mCleanupFilter;
|
||||
private HalfBandFilter_CB_CB mHalfBandFilter = new HalfBandFilter_CB_CB(
|
||||
Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO.getCoefficients(), 0.4f, false );
|
||||
|
||||
public Output( int outputSampleRate, int passFrequency, int attenuation,
|
||||
WindowType windowType )
|
||||
{
|
||||
mCleanupFilter = new ComplexFIRFilter_CB_CB( FilterFactory
|
||||
.getCICCleanupFilter( outputSampleRate,
|
||||
passFrequency,
|
||||
attenuation,
|
||||
windowType ), 0.4f );
|
||||
|
||||
mAssembler.setListener( mCleanupFilter );
|
||||
mCleanupFilter.setListener( mHalfBandFilter );
|
||||
}
|
||||
|
||||
public void dispose()
|
||||
{
|
||||
mAssembler.dispose();
|
||||
mCleanupFilter.dispose();
|
||||
mHalfBandFilter.dispose();
|
||||
}
|
||||
|
||||
/**
|
||||
* Receiver method for the output adapter to receive a filtered,
|
||||
* decimated sample, apply gain correction, apply cleanup filtering
|
||||
* and output the sample values as a complex sample.
|
||||
*/
|
||||
@Override
|
||||
public void receive( float inphase, float quadrature )
|
||||
{
|
||||
mAssembler.receive( inphase, quadrature );
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds a listener to receive output samples
|
||||
*/
|
||||
public void setListener( Listener<ComplexBuffer> listener )
|
||||
{
|
||||
mHalfBandFilter.setListener( listener );
|
||||
if(mListener != null)
|
||||
{
|
||||
mListener.receive((mISum * mGain), (mQSum * mGain));
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Removes the listener from receiving output samples
|
||||
*/
|
||||
public void setListener(ComplexSampleListener listener)
|
||||
{
|
||||
mListener = listener;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Size 2 stage that removes the unnecessary circular buffer management for
|
||||
* a two-stage.
|
||||
*/
|
||||
public class TwoStage extends Stage
|
||||
{
|
||||
public TwoStage()
|
||||
{
|
||||
super();
|
||||
|
||||
mGain = 0.5f;
|
||||
}
|
||||
|
||||
public void receive(float i, float q)
|
||||
{
|
||||
float iSum = mISum + i;
|
||||
float qSum = mQSum + q;
|
||||
|
||||
mISum = i;
|
||||
mQSum = q;
|
||||
|
||||
if(mListener != null)
|
||||
{
|
||||
mListener.receive((iSum * mGain), (qSum * mGain));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Output adapter - applies gain correction and cleanup filter and broadcast
|
||||
* to registered listener.
|
||||
*/
|
||||
public class Output implements ComplexSampleListener
|
||||
{
|
||||
/* Decimated output buffers will contain 1024 samples */
|
||||
private ComplexToComplexBufferAssembler mAssembler =
|
||||
new ComplexToComplexBufferAssembler(2048);
|
||||
|
||||
private ComplexFIRFilter_CB_CB mCleanupFilter;
|
||||
private HalfBandFilter_CB_CB mHalfBandFilter = new HalfBandFilter_CB_CB(
|
||||
Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO.getCoefficients(), 0.4f, false);
|
||||
|
||||
public Output(int outputSampleRate, int passFrequency, int attenuation,
|
||||
WindowType windowType)
|
||||
{
|
||||
mCleanupFilter = new ComplexFIRFilter_CB_CB(FilterFactory
|
||||
.getCICCleanupFilter(outputSampleRate,
|
||||
passFrequency,
|
||||
attenuation,
|
||||
windowType), 0.4f);
|
||||
|
||||
//Bypassing the CIC cleanup filter for now
|
||||
mAssembler.setListener(mHalfBandFilter);
|
||||
|
||||
// mAssembler.setListener( mCleanupFilter );
|
||||
// mCleanupFilter.setListener( mHalfBandFilter );
|
||||
}
|
||||
|
||||
public void dispose()
|
||||
{
|
||||
mAssembler.dispose();
|
||||
mCleanupFilter.dispose();
|
||||
mHalfBandFilter.dispose();
|
||||
}
|
||||
|
||||
/**
|
||||
* Receiver method for the output adapter to receive a filtered,
|
||||
* decimated sample, apply gain correction, apply cleanup filtering
|
||||
* and output the sample values as a complex sample.
|
||||
*/
|
||||
@Override
|
||||
public void receive(float inphase, float quadrature)
|
||||
{
|
||||
mAssembler.receive(inphase, quadrature);
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds a listener to receive output samples
|
||||
*/
|
||||
public void setListener(Listener<ComplexBuffer> listener)
|
||||
{
|
||||
mHalfBandFilter.setListener(listener);
|
||||
}
|
||||
|
||||
/**
|
||||
* Removes the listener from receiving output samples
|
||||
*/
|
||||
public void removeListener()
|
||||
{
|
||||
mHalfBandFilter.removeListener();
|
||||
mHalfBandFilter.removeListener();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user