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mark correlation peak if possible

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This commit is contained in:
Ahmet Inan 2024-04-16 15:32:52 +02:00
parent 8a1d7ca7ba
commit d207823011
2 changed files with 29 additions and 14 deletions
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31
app/src/main/java/xdsopl/robot36/Demodulator.java
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@ -18,6 +18,10 @@ public class Demodulator {
private final Phasor baseBandOscillator;
private final Delay syncPulseDelay;
private final Delay scanLineDelay;
private final int syncPulseSamples;
private float syncPulseMaxLevel;
private int syncPulseMaxPosition;
private int syncPulseCounter;
private Complex baseBand;
private Complex syncPulse;
private Complex scanLine;
@ -34,8 +38,8 @@ public class Demodulator {
int scanLineFilterSamples = (int) Math.round(0.443 * sampleRate / scanLineCutoff) | 1;
scanLineFilter = new ComplexMovingAverage(scanLineFilterSamples);
double syncPulseSeconds = 0.009;
int syncPulseFilterSamples = (int) Math.round(syncPulseSeconds * sampleRate) | 1;
syncPulseFilter = new ComplexMovingAverage(syncPulseFilterSamples);
syncPulseSamples = (int) Math.round(syncPulseSeconds * sampleRate) | 1;
syncPulseFilter = new ComplexMovingAverage(syncPulseSamples);
float lowestFrequency = 1100;
float highestFrequency = 2300;
float cutoffFrequency = (highestFrequency - lowestFrequency) / 2;
@ -49,7 +53,7 @@ public class Demodulator {
scanLineOscillator = new Phasor(-(grayFrequency - centerFrequency), sampleRate);
int syncPulseDelaySamples = (powerWindowSamples - 1) / 2;
syncPulseDelay = new Delay(syncPulseDelaySamples);
int scanLineDelaySamples = (powerWindowSamples - 1) / 2 + (syncPulseFilterSamples - 1) / 2 - (scanLineFilterSamples - 1) / 2;
int scanLineDelaySamples = (powerWindowSamples - 1) / 2 + (syncPulseSamples - 1) / 2 - (scanLineFilterSamples - 1) / 2;
scanLineDelay = new Delay(scanLineDelaySamples);
syncPulseTrigger = new SchmittTrigger(0.17f, 0.19f);
baseBand = new Complex();
@ -66,10 +70,25 @@ public class Demodulator {
float scanLineValue = scanLineDelay.push(scanLineDemod.demod(scanLine));
float syncPulseLevel = Math.min(Math.max(syncPulseValue, 0), 1);
float scanLineLevel = Math.min(Math.max(0.5f * (scanLineValue + 1), 0), 1);
if (syncPulseTrigger.latch(syncPulseLevel))
buffer[i] = -syncPulseLevel;
else
if (syncPulseTrigger.latch(syncPulseLevel)) {
if (syncPulseMaxLevel < syncPulseLevel) {
syncPulseMaxLevel = syncPulseLevel;
syncPulseMaxPosition = syncPulseCounter;
}
++syncPulseCounter;
buffer[i] = syncPulseLevel;
} else if (syncPulseCounter > 0 && syncPulseCounter < syncPulseSamples) {
int offset = syncPulseCounter - syncPulseMaxPosition;
if (offset <= i)
buffer[i - offset] = -1;
syncPulseCounter = 0;
syncPulseMaxLevel = 0;
buffer[i] = scanLineLevel;
} else {
syncPulseCounter = 0;
syncPulseMaxLevel = 0;
buffer[i] = scanLineLevel;
}
}
}
}

12
app/src/main/java/xdsopl/robot36/MainActivity.java
View file

@ -62,15 +62,11 @@ public class MainActivity extends AppCompatActivity {
private void visualizeSignal() {
for (float v : recordBuffer) {
int pixelColor = 0x00010101;
float level = v;
if (v < 0) {
level = -v;
pixelColor = 0x00000100;
int pixelColor = 0xff00ff00;
if (v >= 0) {
int intensity = (int) Math.round(255 * Math.sqrt(v));
pixelColor = 0xff000000 | 0x00010101 * intensity;
}
int intensity = (int) Math.round(255 * Math.sqrt(level));
pixelColor *= intensity;
pixelColor |= 0xff000000;
scopePixels[scopeWidth * curLine + curColumn] = pixelColor;
if (++curColumn >= scopeWidth) {
curColumn = 0;