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Resolves issue with AFC and frequency change event handling,

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specifically for P25 C4FM frequency tracking.

-Clarifies frequency change event naming and adds request/notitification
events for channel frequency correction type events

-Removes DC offset filter from P25 C4FM demodulator which was operating
independently of the AFC tracking component within the C4FM symbol
filter.

-Changed FCD tuner center DC spike buffer size after detecting that the
DC center spike was influencing the P25 C4FM filter frequency tracker
whenever the tuner's center frequency was changed to bring the channel
boundary within 3 kHz of the center spike -- set it to 5 kHz to provide
a better buffer.

-Updated spectral channel display to provide better indication of
automatic frequency control (yellow line) versus channel frequency
This commit is contained in:
denny
2015-12-31 09:08:26 -05:00
parent 81aff1cdef
commit 9c305b0732
24 changed files with 191 additions and 166 deletions
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53
src/spectrum/OverlayPanel.java
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@@ -428,24 +428,33 @@ public class OverlayPanel extends JPanel
/**
* Draws a vertical line at the xaxis
*/
private void drawAFC( Graphics2D graphics, double xaxis, boolean isError )
private void drawChannelCenterLine( Graphics2D graphics, double xaxis )
{
double height = getSize().getHeight() - mSpectrumInset;
if( isError )
{
graphics.setColor( Color.YELLOW );
graphics.setColor( Color.LIGHT_GRAY );
graphics.draw( new Line2D.Double( xaxis, height * 0.75d,
xaxis, height - 1.0d ) );
}
else
{
graphics.setColor( Color.LIGHT_GRAY );
graphics.draw( new Line2D.Double( xaxis, height * 0.65d,
xaxis, height - 1.0d ) );
}
/**
* Draws a vertical line at the xaxis
*/
private void drawAFC( Graphics2D graphics, double frequencyAxis, double errorAxis )
{
double height = getSize().getHeight() - mSpectrumInset;
double lineHeight = height * 0.75d;
graphics.draw( new Line2D.Double( xaxis, height * 0.65d,
xaxis, height - 1.0d ) );
}
graphics.setColor( Color.YELLOW );
//Vertical frequency error line
graphics.draw( new Line2D.Double( errorAxis, lineHeight,
errorAxis, height - 1.0d ) );
//Horizontal line connecting frequency and error lines
graphics.draw( new Line2D.Double( frequencyAxis, lineHeight,
errorAxis, lineHeight ) );
}
/**
@@ -599,16 +608,18 @@ public class OverlayPanel extends JPanel
width );
}
long frequency = tunerChannel.getFrequency();
double frequencyAxis = getAxisFromFrequency( frequency );
drawChannelCenterLine( graphics, frequencyAxis );
/* Draw Automatic Frequency Control line */
if( channel.hasFrequencyControl() )
{
long frequency = tunerChannel.getFrequency();
long error = frequency + channel.getFrequencyCorrection();
drawAFC( graphics, getAxisFromFrequency( frequency ), false );
drawAFC( graphics, getAxisFromFrequency( error ), true );
drawAFC( graphics, frequencyAxis, getAxisFromFrequency( error ) );
}
}
}
@@ -663,13 +674,13 @@ public class OverlayPanel extends JPanel
@Override
public void frequencyChanged( FrequencyChangeEvent event )
{
switch( event.getAttribute() )
switch( event.getEvent() )
{
case SAMPLE_RATE:
case SAMPLE_RATE_CHANGE_NOTIFICATION:
mBandwidth = event.getValue().intValue();
mLabelSizeMonitor.update();
break;
case FREQUENCY:
case FREQUENCY_CHANGE_NOTIFICATION:
mFrequency = event.getValue().longValue();
mLabelSizeMonitor.update();
break;