SYSC4405_Introduction_2010

SYSC4405_Introduction_2010 - S Y S C 4 4 0 5 D i g i t a l...

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Unformatted text preview: S Y S C 4 4 0 5 D i g i t a l S i g n a l P r o c e s s i n g S Y S C 4 4 0 5 _ I n t r o d u c t i o n _ 2 0 1 0 . f m MOHAMMED EL-TANANY, PROFESSOR SYSTEMS & COMPUTER ENGINEERING, CARLETON UNIVERSITY, OTTAWA, ONTARIO 1 / 18 Why use Digital Signal Processing What happens if you make a copy of a copy ...of a copy of a VCR tape (analog)? Noise eventually destroys the signal What happens if you make a copy of a copy ...of a copy of a CD (digital)? Perfect duplicate possible How about analog radio versus digital radio? noise noise noise Original copy1 copy2 copy3 Error check verify Error check verify Error check verify S Y S C 4 4 0 5 D i g i t a l S i g n a l P r o c e s s i n g S Y S C 4 4 0 5 _ I n t r o d u c t i o n _ 2 0 1 0 . f m MOHAMMED EL-TANANY, PROFESSOR SYSTEMS & COMPUTER ENGINEERING, CARLETON UNIVERSITY, OTTAWA, ONTARIO 2 / 18 Analog: always have signal but may have static Digital: either perfect signal or completely wrong signal Digital Transmission (wired media) Normal copper phone lines only use frequencies from 0 -4000 Hz. Therefore, copper wires have been tuned for optimal transmission for 0 4000 Hz. Though not "crystal clear", extra signal capacity available past 4000 Hz. How to use this extra capacity for high speed communication? Have modem that equalizes signal powers above 4000 Hz through your old copper phone lines so that data can be transmitted reliably. Analog Solution (not used): Would require a custom modem ( i.e. , custom equalizer) to be designed and built for every phone line and would eventually have to be replaced as the copper line continued to age. DSP Solution (DSL - Digital Subscriber Line): Allows modem to measure copper line's frequency response and perform adaptive equalization so that it will maximize throughput for aging copper lines. S Y S C 4 4 0 5 D i g i t a l S i g n a l P r o c e s s i n g S Y S C 4 4 0 5 _ I n t r o d u c t i o n _ 2 0 1 0 . f m MOHAMMED EL-TANANY, PROFESSOR SYSTEMS & COMPUTER ENGINEERING, CARLETON UNIVERSITY, OTTAWA, ONTARIO 3 / 18 Analog & Digital Comparison Parameter Analog Signal Processing Digital Signal processing Component Tolerances 1-10% 0.003% Sensitivities Drift Time and Temperature None Noise Floor 60 dB Typical 90+ dB Adaptability Hard, Expensive Easy, Low Cost Volume Manufacturing Hand Tuning Auto Tuning Redesign New Board New Code Layout Noise Sensitive Noise Immunity Advanced Functions Hardware Intensive Additional Software Multi-Functions Multiple Hardware More MIPS & Soft- ware Power and Size larger Smaller Reliability Lower Higher S Y S C 4 4 0 5 D i g i t a l S i g n a l P r o c e s s i n g S Y S C 4 4 0 5 _ I n t r o d u c t i o n _ 2 0 1 0 . f m MOHAMMED EL-TANANY, PROFESSOR SYSTEMS & COMPUTER ENGINEERING, CARLETON UNIVERSITY, OTTAWA, ONTARIO 4 / 18 Typical DSP System DAC ADC LPF LPF Memory Host Ser Pt Ser Pt XINTF HPI Digital Signal Processor analog input analog output analog to digital converter digital to analog converter Lowpass filters digital input digital output S Y S C 4 4 0 5 D i g i t a l S i g n a l P r o c e s s i n g...
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This document was uploaded on 04/14/2010.

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SYSC4405_Introduction_2010 - S Y S C 4 4 0 5 D i g i t a l...

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