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1 Lecture 3EE 214A Abeer Alwan Last Time •Transforms•Properties of the DFT •LTI systems •Relationship between CT and DT signals/transforms •Filtering •Up/Down Sampling
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2 Today •Sounds of American English •Terminology used in speech processing •LTI model of speech production •Source models Phonemes •Basic “theoretical” discrete units to convey meaning. About 42 in American English (AE) •When spoken continuously, they may sound different than when spoken in isolation. •For many phonemes, there are several “allophones” or variations in pronunciations. •Note that there are dialectal differences especially in the pronunciations of vowels.