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Initial code check in continued
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dennis.sheirer
202
src/decode/mdc1200/MDCDecoder.java
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202
src/decode/mdc1200/MDCDecoder.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 decode.mdc1200;
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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 java.util.ArrayList;
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import java.util.List;
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import source.Source.SampleType;
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import alias.AliasList;
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import bits.MessageFramer;
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import bits.SyncPattern;
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import decode.Decoder;
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import decode.DecoderType;
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import dsp.NRZDecoder;
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import dsp.filter.Filters;
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import dsp.filter.FloatFIRFilter;
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import dsp.filter.FloatHalfBandFilter;
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import dsp.fsk.FSK2Decoder;
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import dsp.fsk.FSK2Decoder.Output;
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/**
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* MDC1200 Decoder - 1200 baud 2FSK decoder that can process 48k sample rate
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* complex or floating point samples and output fully framed MDC1200 messages
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*/
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public class MDCDecoder extends Decoder implements Instrumentable
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{
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/* Decimated sample rate ( 48,000 / 2 = 24,000 ) feeding the decoder */
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private static final int sDECIMATED_SAMPLE_RATE = 24000;
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/* Baud or Symbol Rate */
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private static final int sSYMBOL_RATE = 1200;
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/* Message length */
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private static final int sMESSAGE_LENGTH = 304;
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/* Instrumentation Taps */
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private ArrayList<Tap> mAvailableTaps;
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private static final String INSTRUMENT_INPUT =
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"Tap Point: Float Input";
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private static final String INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD =
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"Tap Point: Bandpass Filter > < FSK2 Decoder";
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private static final String INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER =
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"Tap Point: FSK2 Decoder > < NRZI Decoder";
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private static final String INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER =
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"Tap Point: NRZ Decoder > < Message Framer";
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private FSK2Decoder mFSKDecoder;
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private FloatHalfBandFilter mDecimationFilter;
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private FloatFIRFilter mBandPassFilter;
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private NRZDecoder mNRZDecoder;
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private MessageFramer mMessageFramer;
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private MDCMessageProcessor mMessageProcessor;
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public MDCDecoder( AliasList aliasList )
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{
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super( SampleType.FLOAT );
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/* Decimation filter: 48000 / 2 = 24000 */
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mDecimationFilter = new FloatHalfBandFilter(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO, 1.0002 );
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addFloatListener( mDecimationFilter );
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/* Bandpass filter - predefined */
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mBandPassFilter = new FloatFIRFilter(
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Filters.FIRBP_1200FSK_24000FS.getCoefficients(), 1.02 );
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mDecimationFilter.setListener( mBandPassFilter );
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/* 2FSK Decoder */
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mFSKDecoder = new FSK2Decoder( sDECIMATED_SAMPLE_RATE,
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sSYMBOL_RATE, Output.NORMAL );
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mBandPassFilter.setListener( mFSKDecoder );
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/* NRZ Decoder */
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mNRZDecoder = new NRZDecoder( NRZDecoder.MODE_INVERTED );
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mFSKDecoder.setListener( mNRZDecoder );
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/* Message Framer */
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mMessageFramer = new MessageFramer( SyncPattern.MDC1200.getPattern(),
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sMESSAGE_LENGTH );
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mNRZDecoder.setListener( mMessageFramer );
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/* Message Processor */
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mMessageProcessor = new MDCMessageProcessor( aliasList );
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mMessageProcessor.addMessageListener( this );
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mMessageFramer.addMessageListener( mMessageProcessor );
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}
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public void dispose()
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{
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super.dispose();
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mDecimationFilter.dispose();
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mBandPassFilter.dispose();
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mFSKDecoder.dispose();
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mNRZDecoder.dispose();
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mMessageFramer.dispose();
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mMessageProcessor.dispose();
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}
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@Override
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public DecoderType getType()
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{
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return DecoderType.MDC1200;
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}
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/* Instrumentation */
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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(
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new FloatTap( INSTRUMENT_INPUT, 0, 1.0f ) );
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mAvailableTaps.add(
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new FloatTap( INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD, 0, 0.5f ) );
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mAvailableTaps.addAll( mFSKDecoder.getTaps() );
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mAvailableTaps.add(
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new BinaryTap( INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER, 0, 0.025f ) );
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mAvailableTaps.add(
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new BinaryTap( INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER, 0, 0.025f ) );
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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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mFSKDecoder.addTap( tap );
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switch( tap.getName() )
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{
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case INSTRUMENT_INPUT:
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addFloatListener( (FloatTap)tap );
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break;
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case INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD:
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/* wire the tap between the bandpass filter and the demod */
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FloatTap floatTap = (FloatTap)tap;
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mBandPassFilter.setListener( floatTap );
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floatTap.setListener( mFSKDecoder );
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break;
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case INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER:
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/* wire between FSK2 decoder and NRZ decoder */
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BinaryTap binTap = (BinaryTap)tap;
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mFSKDecoder.setListener( binTap );
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binTap.setListener( mNRZDecoder );
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break;
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case INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER:
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/* wire between demod and framer */
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BinaryTap binInvTap = (BinaryTap)tap;
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mNRZDecoder.setListener( binInvTap );
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binInvTap.setListener( mMessageFramer );
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break;
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default:
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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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mFSKDecoder.removeTap( tap );
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switch( tap.getName() )
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{
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case INSTRUMENT_INPUT:
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removeFloatListener( (FloatTap)tap );
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break;
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case INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD:
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mBandPassFilter.setListener( mFSKDecoder );
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break;
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case INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER:
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mFSKDecoder.setListener( mNRZDecoder );
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break;
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case INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER:
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mNRZDecoder.setListener( mMessageFramer );
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break;
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default:
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}
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}
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}
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