Download - Digital signal Processing ECI-3-832
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Digital signal ProcessingDigital signal Processing
ECI-3-832
Semester 1 2003/2004
Telecommunication and Internet Engineering, School of Engineering,
South Bank University
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CoordinatorCoordinator Dr. Z. Zhao Room:Room: T409 Tel:Tel: 0207 815 6340 Email: Email: [email protected]@lsbu.ac.uk
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TextbookTextbook
Alan V. Oppenheim, Ronald W. Schafer, Discrete-time Signal Processing, 2ed, Prentice Hall, ISBN: 0-13-083443-2
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Unit Structure 1. Introduction to DSP 2. Discrete-time signals 3. Discrete-time systems 4. The z-transform and the Fourier
transforms of discrete-time signals 5. The discrete Fourier transform (DFT)
and its efficient computation (FFT) 6. Digital filters
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Unit Calendar (Changes possible)
Introduction to DSP 1 Discrete-time signals 1-2 Discrete-time systems 3-4 The z-transform and the Fourier transforms 5-7
of discrete-time signals The discrete Fourier transform (DFT) and 8-10
its efficient computation (FFT) Digital filters 12 Revision 13 Examination 14-15
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Teaching and Learning Methods
Lecture: 2 hour each week Tutorial: 2 hour on Even weeks Laboratory work (Matlab
exercises):2 hour of on odd weeks Self learning: 102 hours
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Assessment 3-hour written examination: 75% Workshop assignment: 25%
1. log book 2. formal written reports3. Submit: J200 between 10:00 and 16:00, following the standard school procedure.
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Introduction to DSP1.1 What is DSP?
DSP, or Digital Signal Processing, is concerned with the use of programmable digital hardware and software (digital systems) to perform mathematical operations on a sequence of discrete numbers (a digital signal).
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Introduction to DSP
1.2 A General DSP SystemAnti-
aliasing filter
A/D DSP
D/AReconstructi
on filter
Analog
signal
Analog
signal
Analog
signal
Analog
signal
Digital
signal
Digital
signal
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An Example
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Introduction to DSP1.3 Advantages: Programmable Well-defined, stable, and repeatable Manipulating data in the digital domian
provides high immunity from noise Use of computer algorithms allows
implementation of functions and features that are impossible with analog methods
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Introduction to DSP
1.4 Disadvantages: Relatively low bandwidths Signal resolution is limited by the
D/A and A/D converters.
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Introduction to DSP1.5 Applications: digital sound recording such as CD and
DAT speech and compression for
telecommucation and storage implementation of wireline and radio
modems image enhancement and compression speech synthesis and speech recognition
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What is DSP Used For?
……And much more!And much more!
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Speech Recognition System
Featureextractionspeech
Phoneme recognition
Phonememodels
Sentencerecognition
Wordrecognition
Word pronunciation
Semantic knowledge
decision
Syntactic knowledge
Dialogue knowledge
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Text-to-Speech SynthesisTo be ornot to bethat is thequestion
Textnormalization
expandsabbreviationsdates, times,money..etc
Parsing Pronunciation
Prosodyrules
Tu bee awrnawt tu beedhat iz dhekwestchun
semantic &syntactic ‘partsof speech’ analysis of text
phonetic descriptionof each word, dictionarywith letter-to-sound rules as a back up
Waveformgeneration
Synthesized speech
Apply wordstress, durationand pitch
Phonetic-to-acoustictransformation
phonetic formInputtext
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Speech Coding – Vocoder
Pulse Train
Random Noise
Vocal TractModel
V/U
Synthesized Speech
Decoder
Original Speech
Analysis:• Voiced/Unvoiced decision• Pitch Period (voiced only)• Signal power (Gain)
Signal PowerPitch
Period
Encoder
LPC-10:
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JPEG ExampleOriginal
JPEG (100:1)JPEG (4:1)