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#39 WIP polyphase channelizers.

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Denny
2017-11-18 07:33:28 -05:00
parent b3e4bd6a9c
commit a12aaf7cf3
4 changed files with 21 additions and 21 deletions
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14
src/dsp/filter/FilterFactory.java
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@@ -567,7 +567,7 @@ public class FilterFactory
* For 40db attenuation, calculate the number of symbols based on the following formula:
* Symbols = -44 * alpha + 33
*
* Polyphase TunerChannelizer notes:
* Polyphase Channelizer notes:
* -Set samples Per Symbol at 2 (or more) * number of channels
* -Set symbolCount to sufficient size to produce required attenuation
* -Set symbol rate in hertz
@@ -725,7 +725,7 @@ public class FilterFactory
}
/**
* Creates a windowed-sync (Nyquist) M/2 prototype FIR filter for use with a Polyphase TunerChannelizer/Synthesizer.
* Creates a windowed-sync (Nyquist) M/2 prototype FIR filter for use with a Polyphase Channelizer/Synthesizer.
* The filter is designed for x2 oversampling of each channel and the filter cutoff frequency is incrementally
* adjusted to achieve a -6.02 dB attenuation at the channel band edge to enable perfect reconstruction of adjacent
* channels.
@@ -833,14 +833,16 @@ public class FilterFactory
if(logResults)
{
mLog.debug("Polyphase TunerChannelizer Filter Design Summary");
mLog.debug("Polyphase Channelizer Filter Design Summary");
mLog.debug("-----------------------------------------------------");
mLog.debug("Window Type: " + windowType.name());
mLog.debug("Input Sample Rate: " + sampleRate);
mLog.debug("Channel Bandwidth: " + channelBandwidth);
mLog.debug("Channels: " + channels);
mLog.debug("Window Type: " + windowType.name());
mLog.debug("Taps Per Channel: " + tapsPerChannel + " (Requested:" + tapsPerChannel + ")");
mLog.debug("Filter Length: " + (taps.length + 1));
mLog.debug("Channel Bandwidth: " + channelBandwidth);
mLog.debug("Cutoff Frequency: " + (sampleRate * cutoffFrequency));
mLog.debug("Requested Cutoff Frequency: " + (sampleRate * bandEdge));
mLog.debug("Actual Cutoff Frequency: " + (sampleRate * cutoffFrequency));
mLog.debug("Attenuation at 1.00 OBJECTIVE: " + PERFECT_RECONSTRUCTION_GAIN_AT_BAND_EDGE);
mLog.debug("Attenuation at 1.00 Channels: " + evaluate(taps, bandEdge * 1.00));
mLog.debug("Attenuation at 1.25 Channels: " + evaluate(taps, bandEdge * 1.25));

7
src/dsp/filter/channelizer/ChannelizerViewer.java
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@@ -32,7 +32,6 @@ import source.tuner.TunerChannel;
import source.tuner.configuration.TunerConfigurationModel;
import source.tuner.test.TestTuner;
import spectrum.DFTProcessor;
import spectrum.DFTResultsListener;
import spectrum.DFTSize;
import spectrum.SpectrumPanel;
import spectrum.converter.ComplexDecibelConverter;
@@ -168,12 +167,6 @@ public class ChannelizerViewer extends JFrame
return mChannelPanel;
}
// private float[] getFilter() throws FilterDesignException
// {
// return FilterFactory.getSincChannelizer(CHANNEL_BANDWIDTH, mChannelCount, mFilterTapsPerChannel,
// Window.WindowType.BLACKMAN_HARRIS_7, true);
// }
public class ChannelArrayPanel extends JPanel
{
public ChannelArrayPanel()