instead of Analog Signal Processing

pancakesbootAI and Robotics

Nov 24, 2013 (3 years and 10 months ago)

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Kevin Kuang © 2004

Use Digital Signal Processing

instead of Analog Signal Processing

Kevin kuang © 2004

First signal processing problem


World War II brought us
Ra
dio
D
etection
A
nd
R
anging (RADAR)


-

one of the first signal processing applications


-

it was implemented in analog



-

encounter lots of problem, aging, stability, sensitivity…



By 1955 control theory was established due to the mathematics
explaining:


-

the effects of sampling


-

its spectral effects


-

the z
-
transform


Kevin kuang © 2004

Prophets


“Thus, although many signal processing will be most
economically implemented with analog methods, it is the
capability of digital system to achieve a
guaranteed accuracy
and essentially perfect reproducibility

that is so appealing to
engineers. … To summarize, the importance of the DSP should
eventually surpass that of analog signal processing for the same
reasons that digital computers have surpassed analog
computers.”



-

p5, “Theory and Application of Digital Signal Processing” Prentice Hall,
1975
,
Lawrence Rabiner and Bernard Gold

Kevin kuang © 2004

Digital better than Analog


Analog


-

Aging


-

Sensitivity to the environment


-

Uncertain performance in production units


-

Variation in performance of units


-

Sensitivity analog traces on PCBs


-

Effort to migrate and adopt “canned” solutions



DSP doesn’t have these problems!

Kevin kuang © 2004

Applications


Audio
(sound card, digital musical instruments)


Automotive
(Security Systems, Safety Systems)


Medical
(Medical Imaging, Personal Medical Devices)


Military
(Data Communications, Radar/Sonar)



Telecom
(Navigation Systems, Telecom Accessories)


Video and imaging
(

Digital Still Cameras, Digital TV)


Wireless communication
(cell phone, Bluetooth Solutions)


Kevin kuang © 2004

Summary


Digital system has perfectly reproducible and never varying
performance.



Applications already became everywhere, and more will come.



For any signal problems, think about digital first!