Introduction Advantage of DSP: - Better signal quality & repeatable performance - Flexible  Easily modified (Software Base) - Handle more complex processing that impossible with analog circuitry Disadvantage of DSP: - Limited to signal with relatively LOW BANDWITH - Flexible  Easily modified (Software Base) - Handle more complex processing that impos sible with analog circuitry

Introduction Signal Analysis / Feature Extraction - Extract useful information from a given signal (Speaker and Speech recognation, location and identifi cation of target, etc) Signal Filtering / Shaping Technique - Improve the quality of a given signal (Removal of noise and interference, spliting signal into simpler component, time domain and frequency domain averaging, etc) Speech Processing - CD, Speech recognition & synthesis, compression, etc Application of DSP

Introduction Image Processing - Image enhancement, Image compression, Feature ectraction, etc Communication - Radio Modulator Demodulator (MODEM) - Echo cancellation -etc Application of DSP

What Is DSP? a bit loud Analog Computer Digital Computer ADC DSP DAC OUTPUT

A Typical DSP System DSP Chip Memory Converters (Optional) Analog to Digital Digital to Analog Communication Ports Serial Parallel DSP MEMORY ADC PORTS DAC

Digital Computers STORED PROGRAM AND DATA ARITHMETIC LOGIC UNIT INPUT/ OUTPUT von Neuman Machine Harvard Architecture STORED PROGRAM ARITHMETIC LOGIC UNIT INPUT/ OUTPUT STORED DATA A D D D A A A = ADDRESS D = DATA

DSP Development DSP ASSEMBLER HIGH-LEVEL LANGUAGE ADD A, B Tools of the Trade TEST S/W DESIGN OK? Y N PRODUCT CODE EMULATOR

One Hardware = Many Tasks Upgradability and Flexibility Develop New Code Upgrade Analog Solder New Component Programmability LOW-PASS FILTER MUSIC SYNTHESIZER MOTOR CONTROL SOFTWARE 1 SOFTWARE 2 SOFTWARE N SAME HARDWARE....

Analog Advantages Low cost and simplicity in some applications –Attenuators/amplifiers –Simple filters Wide bandwidth (GHz) Low signal levels Infinite effective sampling rate –Infinite resolution in frequency –No aliasing/reconstruction issues Infinite resolution in amplitude –No quantitation noise

Digital Signal Processing (DSP) Advantages Repeatability –Low sensitivity to component tolerances –Low sensitivity to temperature changes –Low sensitivity to aging effects –Nearly identical performance from unit to unit –Matched circuits cost less High noise immunity In many applications DSP offers higher performance and lower cost –CD players versus phonographic turntable