WHAT IS DSP? - PowerPoint PPT Presentation

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WHAT IS DSP?

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Advantage of DSP: Better signal quality & repeatable performance Flexible Easily modified (Software Base) Handle more complex processing that impossible with – PowerPoint PPT presentation

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Title: WHAT IS DSP?


1
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

2
Introduction
Application of DSP
  • 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

3
Introduction
Application of DSP
  • Image Processing
  • Image enhancement, Image compression, Feature
  • ectraction, etc
  • Communication
  • Radio Modulator Demodulator (MODEM)
  • Echo cancellation
  • etc

4
What Is DSP?
a bit loud
Analog Computer
Digital Computer
DSP
OUTPUT
DAC
ADC
1010
1001
5
A Typical DSP System
MEMORY
  • DSP Chip
  • Memory
  • Converters (Optional)
  • Analog to Digital
  • Digital to Analog
  • Communication Ports
  • Serial
  • Parallel

ADC
DSP
DAC
PORTS
6
Digital Computers
von Neuman Machine
A
STORED PROGRAM AND DATA
ARITHMETIC LOGIC UNIT
INPUT/ OUTPUT
D
Harvard Architecture
A
A
STORED DATA
ARITHMETIC LOGIC UNIT
STORED PROGRAM
INPUT/ OUTPUT
D
D
7
DSP Development
ADD A, B
11100010010100001001
HIGH-LEVEL LANGUAGE
ASSEMBLER
EMULATOR
CODE
TEST
S/W DESIGN
N
DSP
Y
PRODUCT
Tools of the Trade
8
Programmability
  • One Hardware Many Tasks
  • Upgradability and Flexibility
  • Develop New Code Upgrade
  • Analog Solder New Component

LOW-PASS FILTER
SOFTWARE 1
SOFTWARE 2
MUSIC SYNTHESIZER
SAME HARDWARE
MOTOR CONTROL
SOFTWARE N
9
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

10
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
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