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[WIP] The Two-Channel synthesizer is now fully-functional and the

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channelizer sub-system is functionally complete.

Updated the channelizer and synthesizer filter design methods to use a
Kaiser windowed Nyquist filter.  Updated the synthesizer filter design
to use a new cutoff frequency of 105% of the channel bandwidth to
resolve a slight dip in the synthesized channel gain at the channel
union region.

Updated the 2 channel output processor to use a low-pass filter that
is designed for the runtime channel sample rate versus hard-coded 12.5
khz.

Testing and redesign continues ...
This commit is contained in:
Denny
2018-05-20 07:21:14 -04:00
parent 341e740e77
commit c13315f731
21 changed files with 698 additions and 459 deletions
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2
src/main/java/io/github/dsheirer/spectrum/DFTProcessor.java
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@@ -44,7 +44,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
public class DFTProcessor implements Listener<ReusableComplexBuffer>, ISourceEventProcessor, IDFTWidthChangeProcessor
{
private static final Logger mLog = LoggerFactory.getLogger(DFTProcessor.class);
private static final int BUFFER_QUEUE_MAX_SIZE = 12;
private static final int BUFFER_QUEUE_MAX_SIZE = 20;
private static final int BUFFER_QUEUE_OVERFLOW_RESET_THRESHOLD = 6;
private static final String FRAME_RATE_PROPERTY = "spectral.display.frame.rate";

12
src/main/java/io/github/dsheirer/spectrum/SpectrumPanel.java
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@@ -33,8 +33,14 @@ import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.swing.*;
import java.awt.*;
import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.util.Arrays;
@@ -295,7 +301,7 @@ public class SpectrumPanel extends JPanel implements DFTResultsListener, Setting
*/
public void setSampleSize(double sampleSize)
{
Validate.isTrue(2.0 <= sampleSize && sampleSize <= 32.0);
Validate.isTrue(2.0 <= sampleSize && sampleSize <= 64.0);
mDBScale = (float)(20.0 * Math.log10(Math.pow(2.0, sampleSize - 1)));
}