digital signal processing (0650322) introduction to dsp€¦ · what is digital signal processing...
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Instructor: Eng. Nada Khatib
Website: http://www.philadelphia.edu.jo/academics/nkhatib/
Digital Signal Processing (0650322) Introduction to DSP
Philadelphia University/Faculty of Engineering
Communication and Electronics Engineering
Eng. Nada Khatib Ch 1- Introduction 1
Outline
• What is Digital Signal Processing?
• Advantages of DSP over ASP
• Disadvantages of DSP
• Basic elements of DSP system
• DSP application
Eng. Nada Khatib Ch 1- Introduction 2
What is Digital Signal Processing
– DSP is a technique of performing operations (filtering, compression, spectrum anlaysis,…) on signals (speech signal, ECG signal,….) represented digitally using coding on special digital purpose hardware, a microprocessor or digital signal processor chip
Eng. Nada Khatib 3 Ch 1- Introduction
Eng. Nada Khatib 4
Microphone
Thermocouple
temperature sensor
Electrocardiogram electrodes
Ch 1- Introduction
one dimensional
single channel signal
one dimensional
multichannel signal
Eng. Nada Khatib 5
Black and White Picture
Ch 1- Introduction
Two dimensional signal
y
x
I(x1,y1( x1
y1
Color TV Picture
Three dimensional signal
and three channel signal
Types of signal processing
• The signal processing can be broadly divided into two categories:
– ASP
– DSP
Eng. Nada Khatib Ch 1- Introduction 6
Analog and digital ssytems
Eng. Nada Khatib Ch 1- Introduction 7
Digital Low Pass Filter Analog Low Pass Filter
b0=b1=wc /(wc +1) and
a1=-(wc-1)/(wc+1) Ωc= 1/RC
Difference equation:
y(n)=-a1y(n-1)+b0x(n)+b1x(n-1)
Differential equation:
oo
in vdt
dvRCv
Basic elements of DSP system – Most of signals encountered in science and
engineering are analog in nature.
– To perform the processing digitally, there is a need for an interface between the analog signal and the digital processor.
Eng. Nada Khatib 8 Ch 1- Introduction
Advantages of DSP over ASP
• Greater flexibility
• More accurate
• Easily stored
• Implementation of Sophistication processing
• cheaper
Eng. Nada Khatib Ch 1- Introduction 9
Disadvantages of DSP
– DSP is not without disadvantages. However the significant of these disadvantages is being continually diminished by new technology.
• speed
• Finite wordlength problems.
Eng. Nada Khatib 10 Ch 1- Introduction
DSP application • Speech processing
– Speech recognition
– Speech to text
– Speak and spell
• Biomedical
– Patient monitoring
– ECG analysis
– Medical imaging
• Telecommunication
– Adaptive equalizer
– Channel coding Eng. Nada Khatib 11 Ch 1- Introduction
DSP application
• Military
– Secure communication
– Radar processing
• Consumers applications
– Digital cameras
– Mobile phone
– MP3 player
• Image processing
– Satellite weather map
– Image enhancement Eng. Nada Khatib 12 Ch 1- Introduction
DSP application
Eng. Nada Khatib 13 Ch 1- Introduction
DSP application
Eng. Nada Khatib Ch 1- Introduction 14
ECG recorder with
the removed 60 Hz
interference
ECG
preamplifier
60-Hz
interference
Digital notch fi l ter for
eliminating 60-Hz
intererenceECG signal
with 60-Hz
inteference
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