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filter out too short and too long pulses

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This commit is contained in:
Ahmet Inan 2024-04-17 10:05:49 +02:00
parent 9a13d060eb
commit 4324709fe4
1 changed files with 6 additions and 3 deletions
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9
app/src/main/java/xdsopl/robot36/Demodulator.java
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@ -18,7 +18,8 @@ public class Demodulator {
private final Phasor baseBandOscillator;
private final Delay syncPulseDelay;
private final Delay scanLineDelay;
private final int syncPulseSamples;
private final int syncPulseLowMark;
private final int syncPulseHighMark;
private float syncPulseMaxValue;
private int syncPulseMaxPosition;
private int syncPulseCounter;
@ -40,7 +41,9 @@ public class Demodulator {
int scanLineFilterSamples = (int) Math.round(0.443 * sampleRate / scanLineCutoff) | 1;
scanLineFilter = new ComplexMovingAverage(scanLineFilterSamples);
double syncPulseSeconds = 0.009;
syncPulseSamples = (int) Math.round(syncPulseSeconds * sampleRate) | 1;
int syncPulseSamples = (int) Math.round(syncPulseSeconds * sampleRate) | 1;
syncPulseLowMark = syncPulseSamples / 2;
syncPulseHighMark = syncPulseSamples * 2;
syncPulseFilter = new ComplexMovingAverage(syncPulseSamples);
float lowestFrequency = 1100;
float highestFrequency = 2300;
@ -78,7 +81,7 @@ public class Demodulator {
syncPulseMaxPosition = syncPulseCounter;
}
++syncPulseCounter;
} else if (syncPulseCounter > 0 && syncPulseCounter < syncPulseSamples) {
} else if (syncPulseCounter > syncPulseLowMark && syncPulseCounter < syncPulseHighMark) {
syncPulseOffset = i + syncPulseMaxPosition - syncPulseCounter;
syncPulseDetected = true;
syncPulseCounter = 0;