diff --git a/app/src/main/java/xdsopl/robot36/MainActivity.java b/app/src/main/java/xdsopl/robot36/MainActivity.java
index ac6698d..f8b88dc 100644
--- a/app/src/main/java/xdsopl/robot36/MainActivity.java
+++ b/app/src/main/java/xdsopl/robot36/MainActivity.java
@@ -37,6 +37,7 @@ public class MainActivity extends AppCompatActivity {
 	private float[] recordBuffer;
 	private AudioRecord audioRecord;
 	private TextView status;
+	private SimpleMovingAverage powerAvg;
 	private int tint;
 	private int curLine;
 
@@ -58,7 +59,7 @@ public class MainActivity extends AppCompatActivity {
 
 	private void processSamples() {
 		for (float v : recordBuffer) {
-			int x = Math.min((int) (scopeWidth * v * v), scopeWidth);
+			int x = Math.min((int) (scopeWidth * powerAvg.avg(v * v)), scopeWidth);
 			for (int i = 0; i < x; ++i)
 				scopePixels[scopeWidth * curLine + i] = tint;
 			for (int i = x; i < scopeWidth; ++i)
@@ -71,6 +72,11 @@ public class MainActivity extends AppCompatActivity {
 		scopeView.invalidate();
 	}
 
+	private void initTools(int sampleRate) {
+		double powerWindowSeconds = 0.5;
+		powerAvg = new SimpleMovingAverage((int) Math.round(powerWindowSeconds * sampleRate));
+	}
+
 	private void initAudioRecord() {
 		int audioSource = MediaRecorder.AudioSource.UNPROCESSED;
 		int channelConfig = AudioFormat.CHANNEL_IN_MONO;
@@ -87,6 +93,7 @@ public class MainActivity extends AppCompatActivity {
 			if (audioRecord.getState() == AudioRecord.STATE_INITIALIZED) {
 				audioRecord.setRecordPositionUpdateListener(recordListener);
 				audioRecord.setPositionNotificationPeriod(recordBuffer.length);
+				initTools(sampleRate);
 				startListening();
 			} else {
 				setStatus(R.string.audio_init_failed);
diff --git a/app/src/main/java/xdsopl/robot36/SimpleMovingAverage.java b/app/src/main/java/xdsopl/robot36/SimpleMovingAverage.java
new file mode 100644
index 0000000..9a24c87
--- /dev/null
+++ b/app/src/main/java/xdsopl/robot36/SimpleMovingAverage.java
@@ -0,0 +1,21 @@
+/*
+Simple Moving Average
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class SimpleMovingAverage extends SimpleMovingSum {
+	public SimpleMovingAverage(int length) {
+		super(length);
+	}
+
+	public float avg() {
+		return sum() / length;
+	}
+
+	public float avg(float input) {
+		return sum(input) / length;
+	}
+}
diff --git a/app/src/main/java/xdsopl/robot36/SimpleMovingSum.java b/app/src/main/java/xdsopl/robot36/SimpleMovingSum.java
new file mode 100644
index 0000000..437f8ec
--- /dev/null
+++ b/app/src/main/java/xdsopl/robot36/SimpleMovingSum.java
@@ -0,0 +1,37 @@
+/*
+Simple Moving Sum
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class SimpleMovingSum {
+	private final float[] tree;
+	private int leaf;
+	public final int length;
+
+	public SimpleMovingSum(int length) {
+		this.length = length;
+		this.tree = new float[2 * length];
+		this.leaf = length;
+	}
+
+	public void add(float input) {
+		tree[leaf] = input;
+		for (int child = leaf, parent = leaf / 2; parent > 0; child = parent, parent /= 2)
+			tree[parent] = tree[child] + tree[child ^ 1];
+		if (++leaf >= tree.length)
+			leaf = length;
+	}
+
+	public float sum() {
+		return tree[1];
+	}
+
+	public float sum(float input) {
+		add(input);
+		return sum();
+	}
+}
+