async def _transcribe(self, audio: bytes) -> Transcription:
        """Transcribe audio data to text.

        Args:
            audio: Raw audio data in WAV format.

        Returns:
            Transcription: Object containing the transcribed text.

        Raises:
            NotImplementedError: Must be implemented by subclasses.
        """
        raise NotImplementedError
Transcribe audio data to text.

        Args:
            audio: Raw audio data in WAV format.

        Returns:
            Transcription: Object containing the transcribed text.

        Raises:
            NotImplementedError: Must be implemented by subclasses.
        
src/pipecat/services/whisper/base_stt.py