diff --git a/idriz/assistant.py b/idriz/assistant.py
index c2c00b6..a98a680 100644
--- a/idriz/assistant.py
+++ b/idriz/assistant.py
@@ -91,6 +91,9 @@ class Assistant:
         self.conn = None
         self.jobs: set[asyncio.Task] = set()
         self.greeted = False
+        self.current_response = ""
+        self.response_active = False
+        self.cancelled_responses: set[str] = set()
 
     # ---------- alati ----------
     async def tool_wikipedia(self, args: dict) -> str:
@@ -155,6 +158,20 @@ class Assistant:
             ok = False
         await self.notify_model(("GOTOVO. " if ok else "GREŠKA. ") + result + " Reci to djetetu kratko, na bosanskom.")
 
+    async def interrupt_speech(self) -> None:
+        """Prekini govor koji je u toku (pozadinski poslovi nastavljaju)."""
+        speaking = self.speaker.is_playing(0.0) or self.response_active
+        if self.response_active and self.conn:
+            self.cancelled_responses.add(self.current_response)
+            try:
+                await self.conn.send({"type": "response.cancel"})
+            except Exception:  # noqa: BLE001
+                log.exception("response.cancel nije uspio")
+        if speaking:
+            await self.speaker.clear()
+            log.info("govor prekinut (mikrofon ugašen)")
+        await self.speaker.write(audio.tone_off())
+
     async def notify_model(self, text: str) -> None:
         if not self.conn:
             return
@@ -193,19 +210,20 @@ class Assistant:
         present = False
         while True:
             now = asyncio.get_event_loop().time()
-            if now - last_check > 1.5:
+            if now - last_check > 0.7:
                 present = await audio.source_present(self.cfg.mic_device)
                 last_check = now
             if not present:
                 if self.mic.running:
                     await self.mic.stop()
                     log.info("mikrofon isključen (prekidač), ne slušam")
-                await asyncio.sleep(0.5)
+                    await self.interrupt_speech()
+                await asyncio.sleep(0.3)
                 continue
             if not self.mic.running:
                 await self.mic.start()
                 log.info("mikrofon uključen, slušam")
-                await self.speaker.write(audio.tone())
+                await self.speaker.write(audio.tone_on())
             chunk = await self.mic.read()
             if not chunk:
                 await self.mic.stop()
@@ -220,7 +238,14 @@ class Assistant:
         async for event in self.conn:
             t = event.type
             if t == "response.output_audio.delta":
+                if getattr(event, "response_id", "") in self.cancelled_responses:
+                    continue
                 await self.speaker.write(base64.b64decode(event.delta))
+            elif t == "response.created":
+                self.current_response = event.response.id or ""
+                self.response_active = True
+            elif t == "response.done":
+                self.response_active = False
             elif t == "response.output_audio_transcript.delta":
                 transcript += event.delta
             elif t == "response.output_audio_transcript.done":
diff --git a/idriz/audio.py b/idriz/audio.py
index 06379d2..85b3cab 100644
--- a/idriz/audio.py
+++ b/idriz/audio.py
@@ -36,6 +36,16 @@ def tone(freq: float = 880.0, ms: int = 150, volume: float = 0.3) -> bytes:
     return samples.tobytes()
 
 
+def tone_on() -> bytes:
+    """Mikrofon uključen: dva tona naviše."""
+    return tone(660, 120) + tone(990, 160)
+
+
+def tone_off() -> bytes:
+    """Mikrofon isključen / prekid govora: dva tona naniže."""
+    return tone(990, 120) + tone(440, 220)
+
+
 async def source_present(name: str) -> bool:
     """Da li PipeWire trenutno ima izvor tog imena (USB mikrofon nestane kad se isključi prekidač)."""
     if not name: