ECE201Notes(1)

ECE201Notes(1) - ECE 201 Digital Logic Chapter 1 -...

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ECE 201 Digital Logic Chapter 1 - Introduction 1 of 5 What’s the difference between Digital and Analog ? Which is “Better”? t f(t) 2 1 4 6 3 5 7 2 4 6 7 1 3 5 Analog Signal t f(t) 2 1 4 6 3 5 7 2 4 6 7 1 3 5 Sampled Analog Signal
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ECE 201 Digital Logic Chapter 1 - Introduction 2 of 5 t f(t) 2 1 4 6 3 5 7 2 4 6 7 1 3 5 “Better” Sampled Analog Signal But information is lost at both the amplitude and time axes. So why is digital even used? Consider the Following Problem Choose a group of four bits (1’s and 0’s) you wish to send me and write them down. Now use the following sums to add three more bits to your data you wish to send: p 1 = b 1 + b 2 + b 4 p 2 = b 1 + b 3 + b 4 p 3 = b 2 + b 3 + b 4 Then, while your bits are traveling to me, noise is introduced that changes one of the seven. You pick which bit changes and record the change. Then give me the new seven bits. I’ll use the following sums to tell you what your original information was: s 1 = b 1 + b 2 + b 4 + p 1 s 2 = b 1 + b 3 + b 4 + p 2 s 3 = b 2 + b 3 + b 4 + p 3
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This note was uploaded on 04/20/2008 for the course ECE 201 taught by Professor Ried during the Spring '08 term at Clemson.

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ECE201Notes(1) - ECE 201 Digital Logic Chapter 1 -...

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