Update dashboard.html

dashboard.html

@@ -267,7 +267,13 @@ async function toggleRecording() {
 
 async function startRecording() {
     try {
-        const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+        const stream = await navigator.mediaDevices.getUserMedia({
+            audio: {
+                channelCount: 1,
+                echoCancellation: true,
+                noiseSuppression: true
+            }
+        });
         mediaRecorder = new MediaRecorder(stream, { mimeType: 'audio/webm' });
         audioChunks = [];