You are building an internet-based training solution. The solution requires that a user's camera and microphone remain enabled. You need to monitor a video stream of the user and detect when the…

The speech-to-text feature in the Azure AI Speech service can transcribe the spoken audio from the user's microphone into text in real-time. Once the speech is converted to text, it can be programmatically analyzed to identify keywords, phrases, or grammatical structures indicative of a question, directly addressing the requirement to detect when a user asks an instructor a question.

Language detection in Azure AI Language service identifies the natural language of text (e.g., English, Spanish) but does not analyze the content to determine if a question has been asked.

The Face service in Azure AI Vision analyzes facial attributes and emotions from video, which is irrelevant to detecting spoken questions from audio.

Object detection in Azure AI Custom Vision identifies physical objects within images or video frames and does not process audio or understand spoken language.