To an Automatic Speech Recognition System? Jiang Wu Electrical Engineering Department.

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Presentation transcript:

to an Automatic Speech Recognition System? Jiang Wu Electrical Engineering Department

 Say if you are only allowed to use 39 values to represent a speech seg of 1 sec long…  What are good features? ◦ Discriminative ◦ “Curse of Dimensionality”

 For each frame of pre- recorded speech, we try to extract the feature as to compress its spectrum.

 Most recent research has shown that spectral trajectories, over time, also play an important role in ASR.  Thus, we also want to let computers see what happens over time, about the center of each static feature.

 Pitch Contour : ◦ Strongly related to “tones” ◦ Very popular feature type for tonal languages: Mandarin, Cantonese, Some of Korean dialects, etc.  “Perceptual Features: ◦ Analyze speech signal as to how human’s auditory system “perceptually” process sound ◦ Frequency resolution and time resolution both depend on frequency and time..

 Dr. Montri Karnjanadecha(Force Alignment)  Chandra Vootkuri (Ph.D.)(Landmark Theory)  Brian Wong (M.S.)(Freq. Non-linearity)  Andrew Hwang(M.S.)(Feature Transform)  Project 1: To create an open source multi- language audio database for spoken language processing applications.  Project 2: To understand tonal languages.

◦ Signal processing (A/D) ◦ Probability theory, pattern recognition and machine learning ◦ Understanding of human auditory system/ linguistic/musicality will be a bonus!

◦ Pronunciation therapy ◦ Singing voice processing + ◦ Hearing aids Tons of interesting applications!!

◦ Not just the Microsoft speech-text software on your PC..

Questions?