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#296 APCO25 Phase II Decoder Implementation (#589)

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P25 Phase 2 Decoder implementation.
This commit is contained in:
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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51
src/main/java/io/github/dsheirer/dsp/psk/SymbolDecisionData.java
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@@ -1,18 +1,24 @@
/*******************************************************************************
* 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.buffer.ComplexCircularBuffer;
@@ -25,14 +31,16 @@ public class SymbolDecisionData
private ComplexCircularBuffer mBuffer;
private float mSamplingPoint;
private float mSamplesPerSymbol;
/**
* Circular buffer for capturing two symbols worth of sample data for use in instrumentation.
* @param samplesPerSymbol to size the buffer
*/
public SymbolDecisionData(int samplesPerSymbol)
public SymbolDecisionData(float samplesPerSymbol)
{
mBuffer = new ComplexCircularBuffer(2 * samplesPerSymbol);
mSamplesPerSymbol = samplesPerSymbol;
mBuffer = new ComplexCircularBuffer(8);
}
/**
@@ -68,7 +76,20 @@ public class SymbolDecisionData
}
/**
* Array of demodulated samples representing the current symbol where each current sample is demodulated against
* Raw samples
*/
public Complex[] getSamples()
{
return mBuffer.getAll();
}
public Complex[] getSamples(int length)
{
return mBuffer.get(length);
}
/**
* Array of (FM) demodulated samples representing the current symbol where each current sample is demodulated against
* the previous symbol's sample to produce the differential demodulated sample. Samples are in time order.
*
* Note: differential decoding is on an integral samples-per-symbol basis and does not use fractional interpolation.