Service that converts spoken audio into text (Speech to Text) and text into natural-sounding voice (Text to Speech), supporting real-time and batch transcription, plus speech translation and speaker recognition.
In AI-901 you're tested on the use case for each direction: transcribing call center calls → Speech to Text; generating an audiobook from text → Text to Speech. Both capabilities are part of Azure AI Speech.
Azure AI Speech (Speech to Text / Text to Speech) is a concept that can show up on the exam. Check the full guide to see it in context.