diff --git a/frontend/src/composables/useSilenceDetector.ts b/frontend/src/composables/useSilenceDetector.ts
index 04295b2..2889514 100644
--- a/frontend/src/composables/useSilenceDetector.ts
+++ b/frontend/src/composables/useSilenceDetector.ts
@@ -22,6 +22,9 @@ export function useSilenceDetector(options: SilenceDetectorOptions = {}) {
   function start(stream: MediaStream, onSilence: () => void): void {
     stop()
     audioCtx = new AudioContext()
+    // Some browsers start AudioContext in "suspended" state — resume so
+    // getByteFrequencyData returns real values instead of all zeros.
+    audioCtx.resume().catch(() => {})
     const source = audioCtx.createMediaStreamSource(stream)
     const analyser = audioCtx.createAnalyser()
     analyser.fftSize = 256