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Updates the heterodyne channelizer's center frequency calculator to

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only update the center frequency when needed and to place the set of
decoding channels adjacent to the right side of the tuner's center
frequency when the complete set of channels fit into the usable half
bandwidth of the tuner.
This commit is contained in:
Denny
2018-09-16 06:02:46 -04:00
parent 001883edc2
commit 0aaec8ff54
3 changed files with 139 additions and 43 deletions
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71
src/main/java/io/github/dsheirer/source/tuner/manager/CenterFrequencyCalculator.java
View File

@@ -54,48 +54,57 @@ public class CenterFrequencyCalculator
//Start by placing the highest frequency channel at the high end of the spectrum
candidateFrequency = maxChannelFrequency - (tunerController.getUsableBandwidth() / 2);
//Iterate the channels and make sure that none of them overlap the center DC spike buffer, if one exists
if(tunerController.getMiddleUnusableHalfBandwidth() > 0)
if(maxChannelFrequency - minChannelFrequency <= tunerController.getUsableHalfBandwidth())
{
boolean processingRequired = true;
while(isValidCandidateFrequency && processingRequired)
candidateFrequency = minChannelFrequency - tunerController.getMiddleUnusableHalfBandwidth();
isValidCandidateFrequency = true;
}
else
{
//Iterate the channels and make sure that none of them overlap the center DC spike buffer, if one exists
if(tunerController.getMiddleUnusableHalfBandwidth() > 0)
{
processingRequired = false;
boolean processingRequired = true;
long minAvoid = candidateFrequency - tunerController.getMiddleUnusableHalfBandwidth();
long maxAvoid = candidateFrequency + tunerController.getMiddleUnusableHalfBandwidth();
//If any of the center channel(s) overlap the central DC spike avoid area, we'll iteratively
//increase the tuned frequency causing the set of channels to move left in the tuned bandwidth until
//we either find a good center tune frequency, or we walk the lowest frequency channel out of the
//minimum tuned range, in which case we'll throw an exception indicating we don't have a solution.
for(TunerChannel channel : channels)
while(isValidCandidateFrequency && processingRequired)
{
if(channel.overlaps(minAvoid, maxAvoid))
processingRequired = false;
long minAvoid = candidateFrequency - tunerController.getMiddleUnusableHalfBandwidth();
long maxAvoid = candidateFrequency + tunerController.getMiddleUnusableHalfBandwidth();
//If any of the center channel(s) overlap the central DC spike avoid area, we'll iteratively
//increase the tuned frequency causing the set of channels to move left in the tuned bandwidth until
//we either find a good center tune frequency, or we walk the lowest frequency channel out of the
//minimum tuned range, in which case we'll throw an exception indicating we don't have a solution.
for(TunerChannel channel : channels)
{
//Calculate a tuned frequency adjustment that places this overlapping channel just to the
//left of the central DC spike avoid zone
long adjustment = channel.getMaxFrequency() - minAvoid + 1;
//If the candidate frequency doesn't push the lowest channel out of bounds, make adjustment
if(candidateFrequency + adjustment - (tunerController.getUsableBandwidth() / 2) <= minChannelFrequency)
if(channel.overlaps(minAvoid, maxAvoid))
{
candidateFrequency += adjustment;
processingRequired = true;
}
//Otherwise, punt and indicate that we can't find a center frequency or add the channel
else
{
isValidCandidateFrequency = false;
}
//Calculate a tuned frequency adjustment that places this overlapping channel just to the
//left of the central DC spike avoid zone
long adjustment = channel.getMaxFrequency() - minAvoid + 1;
//break out of the for/each loop, so that we can start over again with all of the channels
break;
//If the candidate frequency doesn't push the lowest channel out of bounds, make adjustment
if(candidateFrequency + adjustment - (tunerController.getUsableBandwidth() / 2) <= minChannelFrequency)
{
candidateFrequency += adjustment;
processingRequired = true;
}
//Otherwise, punt and indicate that we can't find a center frequency or add the channel
else
{
isValidCandidateFrequency = false;
}
//break out of the for/each loop, so that we can start over again with all of the channels
break;
}
}
}
}
}
}
if(isValidCandidateFrequency)

27
src/main/java/io/github/dsheirer/source/tuner/manager/HeterodyneChannelSourceManager.java
View File

@@ -108,23 +108,26 @@ public class HeterodyneChannelSourceManager extends ChannelSourceManager
*/
private void updateTunerFrequency()
{
long centerFrequency = CenterFrequencyCalculator.getCenterFrequency(mTunerController, getTunerChannels());
if(centerFrequency == CenterFrequencyCalculator.INVALID_FREQUENCY)
if(!mTunerController.isTunedFor(getTunerChannels()))
{
mLog.error("Couldn't calculate center frequency for tuner and tuner channels");
return;
}
long centerFrequency = CenterFrequencyCalculator.getCenterFrequency(mTunerController, getTunerChannels());
if(centerFrequency != mTunerController.getFrequency())
{
try
if(centerFrequency == CenterFrequencyCalculator.INVALID_FREQUENCY)
{
mTunerController.setFrequency(centerFrequency);
mLog.error("Couldn't calculate center frequency for tuner and tuner channels");
return;
}
catch(SourceException se)
if(centerFrequency != mTunerController.getFrequency())
{
mLog.error("Couldn't update tuner center frequency to " + centerFrequency, se);
try
{
mTunerController.setFrequency(centerFrequency);
}
catch(SourceException se)
{
mLog.error("Couldn't update tuner center frequency to " + centerFrequency, se);
}
}
}
}