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[WIP] Updates the AM decoder module.

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Removes a number of unused classes in an effort to remove RealBuffer
usage across the codebase (has been replaced by ReusableBuffers).
This commit is contained in:
Denny
2018-06-30 05:37:13 -04:00
parent df1bc1031e
commit 6f1ce79461
24 changed files with 494 additions and 1986 deletions
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25
src/main/java/io/github/dsheirer/source/tuner/airspy/AirspySampleConverter.java
View File

@@ -1,24 +1,21 @@
/*******************************************************************************
* sdrtrunk
* Copyright (C) 2014-2017 Dennis Sheirer
* 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.
* 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.
* 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/>
* 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.source.tuner.airspy;
import io.github.dsheirer.dsp.filter.dc.DCRemovalFilter_RB;
import io.github.dsheirer.dsp.filter.dc.DCRemovalFilter;
import io.github.dsheirer.dsp.filter.hilbert.HilbertTransform;
import io.github.dsheirer.source.tuner.usb.converter.NativeBufferConverter;
@@ -30,7 +27,7 @@ public class AirspySampleConverter extends NativeBufferConverter
{
private static final float SCALE_SIGNED_12_BIT_TO_FLOAT = 1.0f / 2048.0f;
private DCRemovalFilter_RB mDCFilter = new DCRemovalFilter_RB(0.01f);
private DCRemovalFilter mDCFilter = new DCRemovalFilter(0.01f);
private HilbertTransform mHilbertTransform = new HilbertTransform();
private boolean mSamplePacking = false;
private FloatBuffer mFloatBuffer;

127
src/main/java/io/github/dsheirer/source/tuner/frequency/DCTrackingFrequencyControl.java
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@@ -1,127 +0,0 @@
package io.github.dsheirer.source.tuner.frequency;
/*******************************************************************************
* sdrtrunk
* Copyright (C) 2014-2017 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/>
*
******************************************************************************/
import io.github.dsheirer.module.Module;
import io.github.dsheirer.sample.Listener;
import io.github.dsheirer.sample.real.RealBuffer;
import io.github.dsheirer.source.ISourceEventProvider;
import io.github.dsheirer.source.SourceEvent;
public class DCTrackingFrequencyControl extends Module implements Listener<RealBuffer>, ISourceEventProvider
{
private static float COARSE_THRESHOLD = 0.1f;
private static float LOOP_GAIN = 0.1f;
private static float COARSE_GAIN = 1000.0f;
private static float FINE_GAIN = 100.0f;
private int mErrorCorrection = 0;
private int mMaximumFrequencyCorrection = 0;
private Listener<SourceEvent> mListener;
/**
* DC offset Automatic Frequency Control. Monitors DC bias present in an FM
* demodulated audio stream and issues automatic frequency corrections to
* maintain the DC bias close to zero.
*
* @param maximum - maximum allowable (+/-) frequency correction value.
*/
public DCTrackingFrequencyControl(int maximum)
{
mMaximumFrequencyCorrection = maximum;
}
public void dispose()
{
mListener = null;
}
@Override
public void receive(RealBuffer buffer)
{
double sum = 0.0d;
for(float sample : buffer.getSamples())
{
sum += sample;
}
float mean = (float)(sum / (double)buffer.getSamples().length);
float adjustment = 0.0f;
if(mean > COARSE_THRESHOLD || mean < -COARSE_THRESHOLD)
{
adjustment = mean * COARSE_GAIN;
}
else
{
adjustment = mean * FINE_GAIN;
}
setErrorCorrection(mErrorCorrection + (int)((float)adjustment * LOOP_GAIN));
}
private void setErrorCorrection(int correction)
{
if(mListener != null)
{
if(correction > mMaximumFrequencyCorrection)
{
correction = mMaximumFrequencyCorrection;
}
else if(correction < -mMaximumFrequencyCorrection)
{
correction = -mMaximumFrequencyCorrection;
}
if(correction != mErrorCorrection)
{
mListener.receive(SourceEvent.channelFrequencyCorrectionRequest(correction));
}
}
}
@Override
public void setSourceEventListener(Listener<SourceEvent> listener)
{
mListener = listener;
}
@Override
public void removeSourceEventListener()
{
mListener = null;
}
@Override
public void start()
{
}
@Override
public void stop()
{
}
@Override
public void reset()
{
setErrorCorrection(0);
}
}