Ch1-Acoustic_Theory_of_Speech_Production

Ch1-Acoustic_Theory_of_Speech_Production - Speech...

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Speech Recognition Acoustic Theory of Speech Production
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February 13, 2012 Veton K ë puska 2 Acoustic Theory of Speech  Production Overview  Sound sources  Vocal tract transfer function  Wave equations  Sound propagation in a uniform acoustic tube  Representing the vocal tract with simple acoustic  tubes  Estimating natural frequencies from area  functions  Representing the vocal tract with multiple uniform  tubes 
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February 13, 2012 Veton K ë puska 3 Anatomical Structures for Speech  Production   
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February 13, 2012 Veton K ë puska 4 Places of Articulation for Speech  Sounds 
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February 13, 2012 Veton K ë puska 5 Phonemes in American English 
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SPHINX Phone Set Phoneme Example Translation 1 AA odd AA D 2 AE at AE T 3 AH hut HH AH T 4 AO ought AO T 5 AW cow K AW 6 AY hide HH AY D 7 B be B IY 8 CH dee D IY 9 DH thee DH IY 10 EH Ed EH D 11 ER hurt HH ER T 12 EY ate EY T 13 F fee F IY 14 G green G R IY N 15 HH he HH IY 16 IH it IH T 17 IY eat IY T 18 JH gee JH IY February 13, 2012 Veton K ë puska 6 Phoneme Example Translation 19 K key K IY 20 L lee L IY 21 M me M IY 22 N knee N IY 23 NG ping P IH NG 24 OW oat OW T 25 OY toy T OY 26 P pee P IY 27 R read R IY D 28 S sea S IY 29 SH she SH IY 30 T tea T IY 31 TH theta TH EY T AH 32 UH two T UW 33 V vee V IY 34 Y yield Y IY L D 35 Z zee Z IY 36 ZH seizure S IY ZH ER
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February 13, 2012 Veton K ë puska 7 Speech Waveform: An Example 
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February 13, 2012 Veton K ë puska 8 A Wideband Spectrogram
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A Wideband Spectrogram February 13, 2012 Veton K ë puska 9 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 1000 2000 3000 4000 5000 6000 7000 8000 "She had your dark suit in greasy wash water all year." h# sh iy she eh dcl d had y ix your dcl d aa r kcl k dark s ux tcl suit en in gcl g r iy s ix greasy w aa sh wash epi w aa dx er water ao l all y ih ah year h#
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A Narrowband Spectrogram February 13, 2012 Veton K ë puska 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 1000 2000 3000 4000 5000 6000 7000 8000 "She had your dark suit in greasy wash water all year." h# sh iy she eh dcl d had y ix your dcl d aa r kcl k dark s ux tcl suit en in gcl g r iy s ix greasy w aa sh wash epi w aa dx er water ao l all y ih ah year h#
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February 13, 2012 Veton K ë puska 11 Physics of Sound Sound Generation: Vibration of particles in a medium (e.g., air, water). Speech Production: Perturbation of air particles near the lips. Speech Communication: 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).
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