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#296 APCO25 Phase II Decoder Implementation (#589)

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P25 Phase 2 Decoder implementation.
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Denny Sheirer
2019-11-17 06:56:52 -05:00
committed by GitHub
parent d5b802e794
commit f934676bd0
561 changed files with 35609 additions and 6215 deletions
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39
src/main/java/io/github/dsheirer/dsp/psk/InterpolatingSampleBuffer.java
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@@ -1,34 +1,43 @@
/*******************************************************************************
* sdr-trunk
* Copyright (C) 2014-2018 Dennis Sheirer
/*
*
* This program is free software: you can redistribute it and/or modify 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.
* * ******************************************************************************
* * Copyright (C) 2014-2019 Dennis Sheirer
* *
* * This program is free software: you can redistribute it and/or modify
* * 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.
* *
* * This program is distributed in the hope that it will be useful,
* * but WITHOUT ANY WARRANTY; without even the implied warranty of
* * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* * GNU General Public License for more details.
* *
* * You should have received a copy of the GNU General Public License
* * along with this program. If not, see <http://www.gnu.org/licenses/>
* * *****************************************************************************
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with this program.
* If not, see <http://www.gnu.org/licenses/>
*
******************************************************************************/
*/
package io.github.dsheirer.dsp.psk;
import io.github.dsheirer.dsp.filter.interpolator.RealInterpolator;
import io.github.dsheirer.sample.complex.Complex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class InterpolatingSampleBuffer
{
private final static Logger mLog = LoggerFactory.getLogger(InterpolatingSampleBuffer.class);
private static final float MAXIMUM_DEVIATION_SAMPLES_PER_SYMBOL = 0.02f; // +/- 2% deviation
private Complex mPrecedingSample = new Complex(0,0);
private Complex mCurrentSample = new Complex(0,0);
private Complex mMiddleSample = new Complex(0,0);
private float[] mDelayLineInphase;
private float[] mDelayLineQuadrature;
private int mDelayLinePointer = 0;
protected float[] mDelayLineInphase;
protected float[] mDelayLineQuadrature;
protected int mDelayLinePointer = 0;
private int mTwiceSamplesPerSymbol;
private float mSamplingPoint;