AZ-900 Describe Azure architecture and services Practice Question
Which Azure AI service converts spoken audio into text and text into spoken audio?
⚠ Common exam trap
Watch out — candidates often confuse Azure Speech Service with Azure Translator, mistakenly thinking translation includes audio conversion, or assume LUIS or Bot Service handle speech because they are often used together in voice-enabled bots.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Speech Service
Azure Speech Service provides both speech-to-text and text-to-speech capabilities, enabling bidirectional conversion between spoken audio and written text. It is the single Azure AI service that combines these two functions, unlike other services that handle only one direction or different tasks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Azure Language Understanding (LUIS)
Why it's wrong here
Azure Language Understanding (LUIS) is a natural language processing service focused on intent recognition and entity extraction from text input, such as detecting a user's request to 'turn on the lights' and identifying 'lights' as the entity. It operates strictly on semantic textual data, not on audio waveforms, and cannot transcribe speech or generate spoken audio. While LUIS can be integrated with Azure Speech Service to enable voice commands, the actual speech-to-text and text-to-speech processing is performed by Speech Service, not LUIS.
- ✗
Azure Translator
Why it's wrong here
Azure Translator is a text-oriented translation service supporting numerous languages, with capabilities for document and text translation plus transliteration—but it has no ability to process audio streams or perform speech synthesis. It maps written text from one language to another, so it cannot transform spoken audio into text or generate spoken audio responses. Although speech translation can be achieved by chaining Speech Service with Translator, the audio-to-text and text-to-audio transformations are solely handled by Azure Speech Service, making Translator incorrect for this question.
- ✓
Azure Speech Service
Why this is correct
Azure Speech Service is the specialized Azure AI service delivering real-time and batch speech-to-text transcription, text-to-speech synthesis, and speech translation through a unified REST API and SDK. It uses deep learning acoustic models to transform audio waveforms into text and neural voices to generate natural-sounding speech, making it the definitive service for audio-text conversion. This service also supports custom models, keyword recognition, and speaker identification, so it exactly matches the task of converting spoken language into text or vice versa.
- ✗
Azure Bot Service
Why it's wrong here
Azure Bot Service provides a comprehensive framework for designing, deploying, and managing conversational agents, handling user channels, dialogs, and state management. It acts as an orchestration layer that may call other AI services, but it does not natively process audio signals or perform speech recognition and synthesis. For voice-enabled bots, Azure Speech Service is the underlying component that converts spoken words to text and text back to speech, which Bot Service then processes—so Bot Service is not the core speech conversion service.
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