mirror of
https://github.com/DSheirer/sdrtrunk.git
synced 2026-11-12 16:47:31 -05:00
Improved LTR FSK decoder for LTR, LTR-Net and Passport decoders. Added IIR DC blocking filter and used improved slicer from the FSK decoder.
Added instrumentation to Passport decoder and updated some of the instrumentation components.
This commit is contained in:
dennis.sheirer
227
src/dsp/fsk/LTRFSKDecoder.java
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227
src/dsp/fsk/LTRFSKDecoder.java
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014 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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******************************************************************************/
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package dsp.fsk;
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import instrument.Instrumentable;
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import instrument.tap.Tap;
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import instrument.tap.stream.BinaryTap;
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import instrument.tap.stream.FloatTap;
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import instrument.tap.stream.SymbolEventTap;
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import java.util.ArrayList;
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import java.util.List;
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import sample.Listener;
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import dsp.Slicer;
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import dsp.Slicer.Output;
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import dsp.filter.DCRemovalFilter3;
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import dsp.filter.Filters;
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import dsp.filter.FloatHalfBandFilter;
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import dsp.filter.FloatHalfBandNoDecimateFilter;
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import dsp.filter.LTRPulseShapingFilter;
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import dsp.filter.SquaringFilter;
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public class LTRFSKDecoder implements Listener<Float>, Instrumentable
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{
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private FloatHalfBandFilter mHBFilter1;
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private FloatHalfBandFilter mHBFilter2;
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private FloatHalfBandFilter mHBFilter3;
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private FloatHalfBandFilter mHBFilter4;
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private FloatHalfBandFilter mHBFilter5;
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private FloatHalfBandNoDecimateFilter mHBFilter6;
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private DCRemovalFilter3 mDCFilter;
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private SquaringFilter mSquaringFilter;
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private LTRPulseShapingFilter mPulseShaper;
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private Slicer mSlicer;
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private List<Tap> mAvailableTaps;
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private final String TAP_F1_F2 = "LTR FSK Demod Filter1 >< Filter2";
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private final String TAP_F2_F3 = "LTR FSK Demod Filter2 >< Filter3";
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private final String TAP_F3_F4 = "LTR FSK Demod Filter3 >< Filter4";
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private final String TAP_F4_F5 = "LTR FSK Demod Filter4 >< Filter5";
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private final String TAP_F5_F6 = "LTR FSK Demod Filter5 >< Filter6";
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private final String TAP_F6_DT = "LTR FSK Demod Filter6 >< DC Filter";
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private final String TAP_DT_SF1 = "LTR FSK Demod DC Filter >< Squaring Filter";
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private final String TAP_SF1_PS = "LTR FSK Demod Squaring Filter >< Pulse Shaper";
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private final String TAP_PS_SLICER = "LTR FSK Demod Pulse Shaper >< Slicer";
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private final String TAP_SYMBOL_EVENT = "LTR FSK Demod Symbol Event";
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/**
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* Implements a Logic Trunked Radio sub-audible 300 baud FSK signaling
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* decoder. Expects a 48000 sample rate input.
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*/
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public LTRFSKDecoder()
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{
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mHBFilter1 = new FloatHalfBandFilter(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO, 1.1002 );
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mHBFilter2 = new FloatHalfBandFilter(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO, 1.1002 );
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mHBFilter1.setListener( mHBFilter2 );
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mHBFilter3 = new FloatHalfBandFilter(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO, 1.1002 );
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mHBFilter2.setListener( mHBFilter3 );
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mHBFilter4 = new FloatHalfBandFilter(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO, 1.1002 );
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mHBFilter3.setListener( mHBFilter4 );
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mHBFilter5 = new FloatHalfBandFilter(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO, 1.1002 );
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mHBFilter4.setListener( mHBFilter5 );
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mHBFilter6 = new FloatHalfBandNoDecimateFilter(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO, 1.1002 );
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mHBFilter5.setListener( mHBFilter6 );
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mDCFilter = new DCRemovalFilter3( 0.9946f );
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mHBFilter6.setListener( mDCFilter );
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mSquaringFilter = new SquaringFilter();
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mDCFilter.setListener( mSquaringFilter );
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mPulseShaper = new LTRPulseShapingFilter();
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mSquaringFilter.setListener( mPulseShaper );
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mSlicer = new Slicer( Output.NORMAL, 5 );
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mPulseShaper.setListener( mSlicer );
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}
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@Override
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public void receive( Float sample )
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{
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mHBFilter1.receive( sample );
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}
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public void addListener( Listener<Boolean> listener )
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{
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mSlicer.setListener( listener );
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}
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public void removeListener( Listener<Boolean> listener )
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{
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mSlicer.removeListener( listener );
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}
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@Override
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public List<Tap> getTaps()
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{
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if( mAvailableTaps == null )
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{
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mAvailableTaps = new ArrayList<Tap>();
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mAvailableTaps.add( new FloatTap( TAP_F1_F2, 0, 1.0f ) );
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mAvailableTaps.add( new FloatTap( TAP_F2_F3, 8, 0.5f ) );
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mAvailableTaps.add( new FloatTap( TAP_F3_F4, 12, 0.25f ) );
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mAvailableTaps.add( new FloatTap( TAP_F4_F5, 14, 0.125f ) );
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mAvailableTaps.add( new FloatTap( TAP_F5_F6, 15, 0.0625f ) );
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mAvailableTaps.add( new FloatTap( TAP_F6_DT, 31, 0.0625f ) );
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mAvailableTaps.add( new FloatTap( TAP_DT_SF1, 31, 0.0625f ) );
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mAvailableTaps.add( new BinaryTap( TAP_SF1_PS, 33, 0.0625f ) );
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mAvailableTaps.add( new BinaryTap( TAP_PS_SLICER, 33, 0.0625f ) );
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mAvailableTaps.add( new SymbolEventTap( TAP_SYMBOL_EVENT, 7, 0.0125f ) );
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}
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return mAvailableTaps;
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}
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@Override
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public void addTap( Tap tap )
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{
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switch( tap.getName() )
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{
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case TAP_F1_F2:
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mHBFilter1.setListener( (FloatTap)tap );
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((FloatTap)tap).setListener( mHBFilter2 );
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break;
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case TAP_F2_F3:
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mHBFilter2.setListener( (FloatTap)tap );
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((FloatTap)tap).setListener( mHBFilter3 );
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break;
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case TAP_F3_F4:
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mHBFilter3.setListener( (FloatTap)tap );
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((FloatTap)tap).setListener( mHBFilter4 );
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break;
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case TAP_F4_F5:
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mHBFilter4.setListener( (FloatTap)tap );
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((FloatTap)tap).setListener( mHBFilter5 );
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break;
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case TAP_F5_F6:
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mHBFilter5.setListener( (FloatTap)tap );
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((FloatTap)tap).setListener( mHBFilter6 );
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break;
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case TAP_F6_DT:
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mHBFilter6.setListener( (FloatTap)tap );
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((FloatTap)tap).setListener( mDCFilter );
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break;
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case TAP_DT_SF1:
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mDCFilter.setListener( (FloatTap)tap );
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((FloatTap)tap).setListener( mSquaringFilter );
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break;
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case TAP_SF1_PS:
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mSquaringFilter.setListener( (BinaryTap)tap );
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((BinaryTap)tap).setListener( mPulseShaper );
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break;
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case TAP_PS_SLICER:
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mPulseShaper.setListener( (BinaryTap)tap );
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((BinaryTap)tap).setListener( mSlicer );
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break;
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case TAP_SYMBOL_EVENT:
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mSlicer.addTap( (SymbolEventTap)tap );
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break;
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}
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}
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@Override
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public void removeTap( Tap tap )
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{
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switch( tap.getName() )
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{
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case TAP_F1_F2:
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mHBFilter1.setListener( mHBFilter2 );
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break;
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case TAP_F2_F3:
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mHBFilter2.setListener( mHBFilter3 );
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break;
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case TAP_F3_F4:
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mHBFilter3.setListener( mHBFilter4 );
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break;
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case TAP_F4_F5:
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mHBFilter4.setListener( mHBFilter5 );
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break;
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case TAP_F5_F6:
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mHBFilter5.setListener( mHBFilter6 );
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break;
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case TAP_F6_DT:
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mHBFilter6.setListener( mDCFilter );
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break;
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case TAP_DT_SF1:
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mDCFilter.setListener( mSquaringFilter );
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break;
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case TAP_SF1_PS:
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mSquaringFilter.setListener( mPulseShaper );
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break;
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case TAP_PS_SLICER:
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mPulseShaper.setListener( mSlicer );
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break;
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case TAP_SYMBOL_EVENT:
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mSlicer.removeTap();
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break;
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}
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}
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}
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