TongLecture1 - CS281: Introduction to Computer Architecture...

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CS281: Introduction to Computer Architecture Instructor: Tuanjie Tong
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About the course About Digital Logic and Design Logic should appeal to the CS students Design should appeal to the EE students But both need to co-exist. Why Digital ? Because the world is moving from analog to digital.
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Exercise Can you think of non-computer examples where digital logic is being used (analog being replaced).
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Analog Device and Digital Device What is a analog device? A device mainly contains analog circuits. An analog circuit is a circuit mainly consists of analog components. An analog component is an electrical unit which accepts analog signal as input and outputs analog signal. An analog is any variable signal continuous in both time and amplitude. It differs from a digital signal in that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical context, however mechanical, pneumatic, hydraulic, and other systems may also convey analog signals
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Discrete vs. Digital signal graphs are from www.wikipedia.org
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One example: music recording Example from website: http://electronics.howstuffworks.com/analog-dig Digital recording Vs. Analog recording Edison’s original phonograph to record music Records on a tin foil
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Edison’s original phonograph http://bizarrelabs.com/phono.htm
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Analog recorded message Example of hello: analog signal on oscilloscope Y-axis (vertical): Position of microphone’s diaphragm X-axis: time
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Analog sound wave Horizontal axis: 1/1000 th of a second.
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wave Fix: sampling rate: samples per second and sampling precision (gradation of sampling). This is the scale of the bar in the bar graph.)
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This note was uploaded on 09/22/2008 for the course CS 281 taught by Professor Tong during the Spring '08 term at University of Missouri-Kansas City .

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TongLecture1 - CS281: Introduction to Computer Architecture...

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