EE101Lecture1

EE101Lecture1 - © Mark Redekopp All rights reserved...

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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 – 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 © 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 (0’s and 1’s) • 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 continuous time scale into discrete time discrete time samples ∆t Sampled Signal Original Analog Signal © Mark Redekopp, All rights reserved Quantization • Voltage scale is divided into a set of finite numbers (e.g. Voltage scale is divided into a set of finite numbers (e....
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This note was uploaded on 11/08/2009 for the course EE 101 at USC.

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EE101Lecture1 - © Mark Redekopp All rights reserved...

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