Natural Language Processing is concerned with the interactions between computers and human (natural) languages. The main stages are

Question

BlackTom AI · Accepted Answer

Speech-to-text, understanding, generation, and text-to-speech form the canonical NLP pipeline, so B is correct.

1. Relevant knowledge points and concepts
- Speech Recognition (ASR): converts spoken audio into text (acoustic modeling, language modeling).
- Natural Language Understanding (NLU): parses and interprets text to extract syntax, semantics, intent, entities.
- Natural Language Generation (NLG): produces coherent, context-appropriate textual output from structured meaning or data.
- Speech Synthesis (TTS): converts generated text back into natural-sounding audio.

2. Step-by-step reasoning
Step 1: Interaction often begins with audio input. To process it, an ASR system transcribes audio into text. Step 2: The textual transcript is fed to NLU to determine intent, semantics, and relevant information. Step 3: A dialogue manager or application logic decides an appropriate response; NLG then formulates that response as natural-language text. Step 4: If the system must respond by voice, TTS (speech synthesis) converts the generated text back into audio. These four stages form a full round-trip human-computer language interaction.

3. Intermediate “calculations” (conceptual mapping)
- Audio → [ASR] → Text
- Text → [NLU] → Meaning/intent
- Meaning → [NLG] → Textual response
- Text → [TTS] → Audio response

4. Why the correct answer is correct
Answer B enumerates the sequential, functional stages required for end-to-end spoken language interaction: ASR, NLU, NLG, and TTS. These are the high-level system modules that implement the flow from human speech to system understanding and back to human-readable or audible output.

5. Why the other options are incorrect
- A (None): clearly false because NLP has well-defined stages.  
- C (Automatic Text Summarization, QA, Information Retrieval): these are specific applications or tasks within NLP, not the core processing stages of an interactive system.  
- D (Automatic Summarization, Discourse Analysis, Machine Translation): again, these are specialized tasks/components rather than the general end-to-end stages for speech/text interaction.

6. Conclusion
The main stages are Speech Recognition, Natural Language Understanding, Natural Language Generation, and Speech Synthesis, matching answer B.

Natural Language Processing is concerned with the interactions between computers and human (natural) languages. The main stages are单项选择题

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