EE101Lecture1

EE101Lecture1 - Mark Redekopp, All rights reserved Lecture...

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Unformatted text preview: Mark Redekopp, All rights reserved Lecture 1 Slides Digital vs. Analog Anatomy of a Digital System Number Systems 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) Mark Redekopp, All rights reserved Electronic Information Digital Camera CCDs (Charge- Coupled Devices) output a voltage proportional to the intensity of light hitting it 3 CCDs 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 CCDs Color Filters 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 1 1 volts volts time time Analog Digital 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 Mark Redekopp, All rights reserved Analog to Digital Conversion 1 Analog signal can be converted to a set of digital signals (0s and 1s) 3 Step Process Sample Quantize (Measure) Digitize Analog time Digital Analog to Digital Converter volts time 1 1 1 1 1 11000 Mark Redekopp, All rights reserved Sampling Measure (take samples) of the signals voltage at a regular time interval Sampling converts the continuous time scale...
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This note was uploaded on 12/02/2009 for the course EE 101 at USC.

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EE101Lecture1 - Mark Redekopp, All rights reserved Lecture...

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