Kevin Kuang © 2004 Use Digital Signal Processing instead of Analog Signal Processing.

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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 Radio Detection And Ranging (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!