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#1067 P25 Phase 1 C4FM/LSM decoder redesign. (#2294)

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C4FM now uses SIMD differential decoding and soft sync detection.
LSM updated with soft sync detector and retains original Gardner error detector.
Adds new QPSK symbol view in the now playing channel tab.
Restores PLL error driven tuner Auto-PPM feature.
Deletes the demod viewer GUI application and all instrumented decoders
Updates DMR to send soft symbols to new symbol view in Now Playing.

Co-authored-by: Dennis Sheirer <dsheirer@github.com>
This commit is contained in:
Denny Sheirer
2025-11-16 06:52:17 -05:00
committed by GitHub
parent 48202da9e4
commit 0d886c272e
149 changed files with 5990 additions and 8984 deletions
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41
src/main/java/io/github/dsheirer/dsp/squelch/PowerMonitor.java
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@@ -34,14 +34,14 @@ public class PowerMonitor
private int mPowerLevelBroadcastCount = 0;
private int mPowerLevelBroadcastThreshold;
private Listener<SourceEvent> mSourceEventListener;
private SinglePoleIirFilter mPowerFilter = new SinglePoleIirFilter(0.1f);
private final SinglePoleIirFilter mPowerFilter = new SinglePoleIirFilter(0.1f);
/**
* Constructs an instance
*/
public PowerMonitor()
{
mPowerLevelBroadcastThreshold = 25000; //Based on a default sample rate of 50 kHz
mPowerLevelBroadcastThreshold = 12500; //Based on a default sample rate of 25 kHz
}
/**
@@ -54,36 +54,25 @@ public class PowerMonitor
mPowerLevelBroadcastThreshold = sampleRate / 2;
}
/**
* Processes a complex IQ sample and changes squelch state when the signal power is above or below the
* threshold value.
* @param inphase complex sample component
* @param quadrature complex sample component
*/
public void process(float inphase, float quadrature)
{
mPowerLevelBroadcastCount++;
if(mPowerLevelBroadcastCount > mPowerLevelBroadcastThreshold)
{
mPowerFilter.filter(inphase * inphase + quadrature * quadrature);
}
if(mPowerLevelBroadcastCount > (mPowerLevelBroadcastThreshold + 10))
{
mPowerLevelBroadcastCount = 0;
broadcast(SourceEvent.channelPowerLevel(null, 10.0 * Math.log10(mPowerFilter.getValue())));
}
}
/**
* Processes I&Q complex baseband sample buffers.
*/
public void process(float[] i, float[] q)
{
for(int x = 0; x < i.length; x++)
mPowerLevelBroadcastCount += i.length;
if(mPowerLevelBroadcastCount > mPowerLevelBroadcastThreshold && i.length >= 10)
{
process(i[x], q[x]);
double iSquared, qSquared;
for(int x = 0; x < 10; x++)
{
iSquared = Math.pow(i[x], 2.0f);
qSquared = Math.pow(q[x], 2.0f);
mPowerFilter.filter((float)(iSquared + qSquared));
}
mPowerLevelBroadcastCount -= mPowerLevelBroadcastThreshold;
broadcast(SourceEvent.channelPowerLevel(null, 10.0 * Math.log10(mPowerFilter.getValue())));
}
}