Automatic Frequency Control enhancement. Provides default AFC and ability to disable in the Decoder tab of each channel. Spectral display includes visual indicators of frequency center (grey) and current AFC offset (yellow).

src/dsp/nbfm/NBFMDemodulator.java

@@ -17,9 +17,11 @@
  ******************************************************************************/
 package dsp.nbfm;
 
+import log.Log;
 import sample.Broadcaster;
 import sample.Listener;
 import sample.complex.ComplexSample;
+import dsp.afc.AutomaticFrequencyControl;
 import dsp.filter.ComplexFIRFilter;
 import dsp.filter.FilterFactory;
 import dsp.filter.Window.WindowType;
@@ -30,7 +32,17 @@ public class NBFMDemodulator implements Listener<ComplexSample>
 	private ComplexFIRFilter mIQFilter;
 	private FMDiscriminator mDiscriminator;
 
-	public NBFMDemodulator( double[] iqFilter, double iqGain )
+	/**
+	 * Implements a quadrature narrow-band demodulator that produces float
+	 * valued demodulated, audio filtered output samples.
+	 */
+	public NBFMDemodulator()
+	{
+		this( FilterFactory.getLowPass( 48000, 4000, 73, WindowType.HAMMING ), 
+			  1.0002, true );
+	}
+
+	public NBFMDemodulator( double[] iqFilter, double iqGain, boolean afc )
 	{
 		mIQFilter = new ComplexFIRFilter( iqFilter, iqGain );
 
@@ -54,16 +66,6 @@ public class NBFMDemodulator implements Listener<ComplexSample>
 		mIQFilter.dispose();
 	}
 	
-	/**
-	 * Implements a quadrature narrow-band demodulator that produces float
-	 * valued demodulated, audio filtered output samples.
-	 */
-	public NBFMDemodulator()
-	{
-		this( FilterFactory.getLowPass( 48000, 4000, 73, WindowType.HAMMING ), 
-			  1.0002 );
-	}
-
 	/**
 	 * Receive method for complex samples that are fed into this class to be
 	 * processed