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 loudAnalog Computer

Digital Computer

ADC

DSP

DAC OUTPUT

1010 1001

A Typical DSP System

DSP Chip Memory Converters (Optional)

Analog to DigitalDigital to Analog

Communication PortsSerialParallel

DSP

MEMORY

ADC

PORTS

DAC

Digital Computers

STOREDPROGRAM

ANDDATA

ARITHMETICLOGIC

UNIT

INPUT/OUTPUT

von Neuman Machine

Harvard Architecture

STOREDPROGRAM

ARITHMETICLOGIC

UNIT

INPUT/OUTPUT

STOREDDATA

A

DD

D

AA

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

11100010010100001001

EMULATOR

One Hardware = Many Tasks

Upgradability and FlexibilityDevelop New Code UpgradeAnalog Solder New Component

Programmability

LOW-PASS FILTER

MUSIC SYNTHESIZER

MOTOR CONTROL

SOFTWARE 1

SOFTWARE 2

SOFTWARE N

SAMEHARDWARE.. ..

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