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EE101Lecture1

EE101Lecture1 - Lecture 1 Slides Digital vs Analog Anatomy...

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© Mark Redekopp, All rights reserved Lecture 1 Slides Digital vs. Analog Anatomy of a Digital System Number Systems
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© Mark Redekopp, All rights reserved Electric Signals Information is represented electronically as a time-varying voltage Each voltage level may represent a unique value Frequencies may represent unique values (e.g. sound) Sound converted to electronic signal (voltage vs. time)
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© Mark Redekopp, All rights reserved Electronic Information Digital Camera CCD’s (Charge - Coupled Devices) output a voltage proportional to the intensity of light hitting it 3 CCD’s filtered for measuring Red, Green, and Blue light produce 1 color pixel More info: http://www.science.ca/scientists/scientistprofile.php?pID=129 http://www.microscopy.fsu.edu/primer/digitalimaging/concepts/ccdanatomy.html CCD’s Color Filters
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© Mark Redekopp, All rights reserved Signal Types Analog signal Continuous time signal where each voltage level has a unique meaning Most information types are inherently analog Digital signal Continuous signal where voltage levels are mapped into 2 ranges meaning 0 or 1 Possible to convert a single analog signal to a set of digital signals 0 1 0 1 0 volts volts time time Analog Digital
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© Mark Redekopp, All rights reserved Signals and Meaning 0.0 V 0.8 V 2.0 V 5.0 V Each voltage value has unique meaning 0.0 V 5.0 V Logic 1 Logic 0 Illegal Each voltage maps to ‘0’ or ‘1’ (there is a small illegal range where meaning is undefined) Analog Digital
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© Mark Redekopp, All rights reserved Analog to Digital Conversion 1 Analog signal can be converted to a set of digital signals (0’s and 1’s) 3 Step Process Sample Quantize (Measure) Digitize Analog time Digital Analog to Digital Converter volts time 0 1 0 1 0 1 0 1 0 1 11000
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© Mark Redekopp, All rights reserved Sampling Measure (take samples) of the signals voltage at a regular time interval
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