1. 74.419 Artificial Intelligence 2004 Speech & Natural Language Processing
Speech Recognition
acoustic signal as input
conversion into (phonemes and) written words
Natural Language Processing
written text as input; sentences (or 'utterances')
syntactic analysis: parsing; grammar
semantic analysis: "meaning", semantic representation
pragmatics; dialogue (discourse)

2. Speech Recognition Acoustic / sound wave Filtering, FFT;
Spectral Analysis
Frequency Spectrum
Features (Phonemes; Context)
Signal Processing / Analysis
Phoneme Recognition:
HMM, Neural Networks
Phonemes
Grammar or Statistics
Phoneme Sequences / Words
Grammar or Statistics for
likely word sequences
Word Sequence / Sentence

3. NLP Syntax Analysis - Processes
Part-of-Speech
(POS)
Tagging
Morphological
Analyzer
Parser
Grammar
Rules
Lexicon
the the – determiner Det NP → Det Noun NP recognized NP
Det Noun
parse tree
Linguistic Background Knowledge

4. NLP - Syntactic Analysis
Part-of-Speech
(POS)
Tagging
Morphological
Analyzer
Parser
Grammar
Rules
Lexicon
eat + s eat – verb Verb VP → Verb Noun VP recognized
3rd sing VP
Verb Noun
parse tree