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Introduction to audio signal processing part1

Audio signal processing ver1d. 2. Overall View. Chapter 1 : IntroductionChapter 2 : Signals in time

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Introduction to audio signal processing part1

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    1. Audio signal processing ver1d 1 Introduction to audio signal processing part1 KH WONG, Rm 907 Engineering Building, CSE Dept. CUHK, Email: khwong@cse.cuhk.edu.hk http://www.cse.cuhk.edu.hk/~khwong/cmsc5707 Reference book: Lawrence Rabiner , Ronald Schafer , Theory and Applications of Digital Speech Processing, Pearson 2011 Becchetti and Ricotti, Speech recognition: Theory and C++ Implementation, Wiley. 1999 Lawrence Rabiner and Biing-Hwang Juang , Fundamentals of Speech Recognition, Prentice Hall 1993

    2. Audio signal processing ver1d 2 Overall View Chapter 1 : Introduction Chapter 2 : Signals in time & frequency domain Chapter 3 : Audio feature extraction techniques Chapter 4 : Recognition Procedures

    3. Audio signal processing ver1d 3 Chapter 1: Part 1 Chapter 1 : Introduction Chapter 2 : Signals in time & frequency domain

    4. Audio signal processing ver1d 4 Chapter 1: introduction Content Components of a speech recognition system Types of speech recognition systems speech recognition Hardware A speech production model Phonetics: English and Cantonese

    5. Audio signal processing ver1d 5 Components of A speech recognition system Pre-processor Feature extraction Training of the system Recognition

    6. Audio signal processing ver1d 6 Types of speech recognition technology Isolated speech recognition - the speaker has to speak word-by-word into the system. ( Connected speech recognition - the speaker can speak a number of words without stopping. Continuous speech recognition - like human. Current product: Voice Actions for Android http://googlemobile.blogspot.com/2010/08/just-speak-it-introducing-voice-actions.html

    7. Audio signal processing ver1d 7 Types depending on speakers Speaker dependent recognition - designed for one speaker who has trained the system. Speaker independent recognition - designed for all users without prior training.

    8. Audio signal processing ver1d 8 Exercise 1 Discuss the features of the speech recognition module in the following systems Mobile phone, speech command dialing system PC based Chinese voice input system

    9. Audio signal processing ver1d 9 Conversion time and sampling time Human freq. range 20Hz to 20KHz, Sampling is double of the highest freq. (sampling theory). So sampling for Hi-Fi music > 40KHz. 74 minutes CD music, 44.1KHz sampling 16-bit sound=44.1KHz*2bytes*2channels*60seconds*70min.=783,216,000 bytes (747~ MB). (see http://en.wikipedia.org/wiki/CD-ROM) Compromise: telephone quality sound is 8KHz 8-bit sampling.

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