diff --git a/app/src/main/java/xdsopl/robot36/Demodulator.java b/app/src/main/java/xdsopl/robot36/Demodulator.java
index 54799cf..e050bcb 100644
--- a/app/src/main/java/xdsopl/robot36/Demodulator.java
+++ b/app/src/main/java/xdsopl/robot36/Demodulator.java
@@ -12,6 +12,7 @@ public class Demodulator {
 	private final ComplexMovingAverage scanLineFilter;
 	private final ComplexMovingAverage baseBandLowPass;
 	private final FrequencyModulation scanLineDemod;
+	private final SchmittTrigger syncPulseTrigger;
 	private final Phasor syncPulseOscillator;
 	private final Phasor scanLineOscillator;
 	private final Phasor baseBandOscillator;
@@ -50,6 +51,7 @@ public class Demodulator {
 		syncPulseDelay = new Delay(syncPulseDelaySamples);
 		int scanLineDelaySamples = (powerWindowSamples - 1) / 2 + (syncPulseFilterSamples - 1) / 2 - (scanLineFilterSamples - 1) / 2;
 		scanLineDelay = new Delay(scanLineDelaySamples);
+		syncPulseTrigger = new SchmittTrigger(0.17f, 0.19f);
 		baseBand = new Complex();
 		syncPulse = new Complex();
 		scanLine = new Complex();
@@ -64,7 +66,7 @@ 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 (syncPulseLevel > 0.1)
+			if (syncPulseTrigger.latch(syncPulseLevel))
 				buffer[i] = -syncPulseLevel;
 			else
 				buffer[i] = scanLineLevel;
diff --git a/app/src/main/java/xdsopl/robot36/SchmittTrigger.java b/app/src/main/java/xdsopl/robot36/SchmittTrigger.java
new file mode 100644
index 0000000..93733ec
--- /dev/null
+++ b/app/src/main/java/xdsopl/robot36/SchmittTrigger.java
@@ -0,0 +1,28 @@
+/*
+Schmitt Trigger
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class SchmittTrigger {
+	private final float low, high;
+	private boolean previous;
+
+	SchmittTrigger(float low, float high) {
+		this.low = low;
+		this.high = high;
+	}
+
+	boolean latch(float input) {
+		if (previous) {
+			if (input < low)
+				previous = false;
+		} else {
+			if (input > high)
+				previous = true;
+		}
+		return previous;
+	}
+}