DIGITAL SIGNAL PROCESSING
Introduction
What is Signal ?
A SIGNAL is a measurement of a physical
quantity of certain medium.
Examples of signals:
Audio patterns (voice, speech, music)
Visual patterns (written documents, picture, video,
gesture, facial expression)
Change patterns of other physical quantities:
temperature, EM wave, share market prices, spring
displacement, etc.
Signal contains INFORMATION!
What is Signal ?
Medium:
Physical materials that carry the signal.
Examples: paper (visual patterns,
handwriting, etc.), Air (sound pressure, music,
voice), various video displays (CRT, LCD)
Modality:
Different modes of signals over the same or
different media.
Examples: voice, facial expression and
gesture.
What is Signal Processing?
Ways to manipulate signal in its
original medium or an abstract
representation.
Signal can be abstracted as functions
of time or spatial coordinates.
What is Signal Processing?
Types of processing:
Transformation
Filtering
Detection
Estimation
Recognition and classification
Coding (compression)
Synthesis and reproduction
Recording, archiving
Analyzing, modeling
Digital Signal Processing
Digital
DigitalSignal
Signal D/A
A/D Processing
Processing
The task of DSP is to process sampled
signals (from A/D analog to digital
converter), and provide its output to the
D/A (digital to analog converter) to be
transformed back to physical signals
Digital Signal Processing (DSP)
Block Diagram
Analog Signal Analog Signal
ADC DSP DAC
Digital Signal Digital Signal
Digital Signal Processing (DSP)
Example : Electro Cardio Graph (ECG)
Analog Signal Analog Signal
Digital Signal Digital Signal
Early Signal Processing Systems
Implemented with either main frame computer or special
purpose computers.
Batch processing rather than real time, streamed data
processing.
Accelerate processing speed is of main concern.
Key approach:
Faster hardware
Faster algorithms
Faster algorithms
Reduce the number of arithmetic operations
Reduce the number of bits to represent each data
Most important example: Fast Fourier Transform
DSP Development
1960s : Mainframe
DSP Development
The end of 1970s 1980s : Intel 2920 DSP
DSP Development
1980s : DSP Board with an ADSP 2181 chip
DSP Development
Video DSP Chip
DSP Development
Video DSP Card
DSP Development
ASIC Chip
DSP Development
Audio DSP Card
The Applications of DSP
Applications of DSP in Engineering
& Science
TELECOMMUNICATION
MEDICAL
BIOTECHNOLOGY
MILITERY
INDUSTRIAL
SCIENTIFIC
SPACE
COMMERCIAL
DSP Applications in Telecommunication
Image/Video Compression
Video Conferencing
Speech/Audio Compression
Data Compression
Signal Multiplexing
Echo Cancellation/Reduction
Mobile Communication
DSP Applications in Telecommunication
Video Conferencing
DSP Applications in Telecommunication
Video Telephony
DSP Applications in Telecommunication
Wireless Communication
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DSP Applications in Telecommunication
Video Conferencing in Wireless Communication
DSP Applications in Telecommunication
Echo Canceller
DSP Applications in Telecommunication
Signal Multiplexer
DSP Applications in Medical
Diagnostic Imaging
- Computer Tomography
- Magnetic Resonance Imaging
- Ultrasound
Medical Image Storage and Retrieval
Electrocardiogram Analysis
DSP Applications in Medical
Diagnostic Imaging
DSP Applications in Medical
Magnetic Resonance Imaging
DSP Applications in Medical
Electrocardiogram Analysis
DSP Applications in Biotechnology
Genomic Signal Processing
Biometric Signal Processing
DSP Applications in Biotechnology
Genomic Signal Processing
DSP Applications in Biotechnology
Biometrics Signal Processing
Psychological Characteristic Behavioural Characteristic
DSP Applications in Biotechnology
Biometrics with Iris Recognition
DSP Applications in Military
Secure Communication
Radar and Sonar
Ordnance Guidance
Intelligent Sensory Analysis by Remote
Space Probes
DSP Applications in Military
Secure Communication
DSP Applications in Military
Ordnance Guidance
DSP Applications in Military
Submarine
DSP Applications in Military
Radar
DSP Applications in Military
Sonar
DSP Applications in Industry
Process Monitoring & Control
CAD and Design Tools
Nondestructive Testing
Oil and Mineral Prospecting
DSP Applications in Industry
Non Destructive Testing
Sequence of high speed video images of a water balloon falling on pavement
DSP Applications in Industry
CAD and Design Tools
Software Block Diagram
Chip Layout Design
DSP Applications in Science
Earthquake Recording & Analysis
Spectral Analysis and Data
Acquisition
Simulation Modeling
Space Photograph Enhancement
DSP Applications in Science
Earthquake Analysis
DSP Applications in Science
Earthquake Lab Equipment
DSP Applications in Science
Spectral Analysis for DWDM
DSP Applications in Science
Simulation and Modeling
Models of Metal Recovery
DSP Applications in Science
Equipment Layout
DSP Applications in Space
Space Photo Enhancement
Original Image Enhancement
DSP Applications in Space
Intelligent Sensory Space
DSP Applications in Commercial
Movie Special Effects
Multimedia Presentation
Hifi Music Reproduction
DSP Applications in Commercial
Movie Special Effect
DSP Applications in Commercial
Hi-Fi Music Reproduction
DSP Applications in Commercial
Hi-Fi Music Reproduction
Digital Signal Processing (DSP)
Key points of operation in DSP
- Correlation/Convolution
- Transformation
- Filtering
- Modulation
References
Ifeachor and Jervis, Digital Signal
Processing : A Practical Approach,
Prentice Hall, 2002.
Dadang Gunawan, Lecture Note DSP,
EE Department University of Indonesia,
2005.
