Which object is used to specify that the speech input to be transcribed is in an audio file?

The AudioConfig object is specifically designed for handling audio input in the context of speech recognition tasks. When you need to transcribe speech from an audio file, this object allows you to configure the source of the audio data accurately.

When using the Speech SDK, AudioConfig can accept different audio sources, such as microphone input or pre-recorded audio files. By providing this configuration, the system understands that the input to be processed is coming from an audio file, rather than real-time speech captured from a microphone. This capability is crucial for enabling applications to perform speech-to-text conversions on existing recordings, facilitating various use cases such as transcribing meetings, lectures, or any audio content into text.

The other options, such as SpeechConfig and SpeechRecognizer, play different roles within the speech recognition framework. SpeechConfig primarily handles the overall configuration for speech services, like setting the language or the subscription key. SpeechRecognizer is the component responsible for recognizing speech and performing the actual transcription. While they are integral to the speech recognition process, neither directly specifies that the input is in an audio file format.