Ch1-Acoustic_Theory_of_Speech_Production

Ch1-Acoustic_Theory_of_Speech_Production - ECE 5526: Speech...

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ECE 5526: Speech Recognition Acoustic Theory of Speech  Production
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2/13/12 Veton Këpuska 2 Acoustic Theory of Speech  Production u Overview  u Sound sources  u Vocal tract transfer function  n Wave equations  n Sound propagation in a uniform acoustic tube  u Representing the vocal tract with simple acoustic  tubes  u Estimating natural frequencies from area  functions  u Representing the vocal tract with multiple uniform  tubes 
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2/13/12 Veton Këpuska 3 Anatomical Structures for Speech  Production    
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2/13/12 Veton Këpuska 4 Places of Articulation for Speech  Sounds 
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2/13/12 Veton Këpuska 5 Phonemes in American English 
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IPS Phonetic Alphabet 2/13/12 Veton Këpuska 6
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Veton Këpuska SPHYNX ARPA-BET Phone Set Phoneme  Example Translation AA odd AA D AE at AE T AH hut HH AH T AO ought AO T AW cow K AW AY hide HH AY D B be B IY CH cheese CH IY Z D dee D IY DH thee DH IY EH Ed EH D ER hurt HH ER T EY ate EY T F fee F IY G green G R IY N HH he HH IY IH it IH T IY eat IY T JH gee JH IY IH it IH T Phoneme  Example Translation JH gee JH IY K key K IY L lee L IY M me M IY N knee N IY NG ping P IH NG OW oat OW T OY toy T OY P pee P IY R read R IY D S sea S IY SH she SH IY T tea T IY TH theta TH EY T AH UH hood HH UH D UW two T UW V vee V IY W we W IY Y yield Y IY L D Z zee Z IY
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2/13/12 Veton Këpuska 8 Speech Waveform: An Example  
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2/13/12 Veton Këpuska 9 A Narowband Spectrogram
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A Wideband Spectrogram 2/13/12 Veton Këpuska 10 0 0.5 1 1.5 2 2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 Normalized Magnitude Frequency [Hz] Time [s] SPECTROGRAM 0 0.5 1 1.5 2 2.5 0 2000 4000 6000 8000 "She had your dark suit in greasy wash water al year." h# sh iy she eh dcl d had y ix your aa r kcl k dark s ux tcl suit en in gcl g greasy w wash epi dx er water ao l al ih ah year
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A Narrowband Spectrogram 2/13/12 Veton Këpuska 11 0 0.5 1 1.5 2 2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 Normalized Magnitude Frequency [Hz] Time [s] SPECTROGRAM 0 0.5 1 1.5 2 2.5 0 2000 4000 6000 8000 "She had your dark suit in greasy wash water al year." h# sh iy she eh dcl d had y ix your aa r kcl k dark s ux tcl suit en in gcl g greasy w wash epi dx er water ao l al ih ah year
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2/13/12 Veton Këpuska 12 Physics of Sound u Sound Generation: n Vibration of particles in a medium (e.g., air, water). u Speech Production: n Perturbation of air particles near the lips. u Speech Communication: n Propagation of particle vibrations/perturbations as chain  reaction through free space (e.g., a medium like air) from the  source (i.e., lips of a speaker) to the destination (i.e., ear of a  listener). n Listener’s ear eardrum caused vibrations trigger series of  transductions initiated by this mechanical motion leading to  neural firing ultimately perceived by the brain. 
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2/13/12 Veton Këpuska 13 Physics of Sound u sound wave  is the propagation of a disturbance  of particles through an air medium (or more 
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Ch1-Acoustic_Theory_of_Speech_Production - ECE 5526: Speech...

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