Ch02A_ECOA2e

Ch02A_ECOA2e - Chapter 2 Special Section Focus on Codes for...

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Chapter 2 Special Section Focus on Codes for Data Recording and Transmission
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2 2.A Introduction The main part of Chapter 2 provides great detail about the various ways in which digital computers express numeric and non-numeric values. These expressions are an abstraction for the way in which the values are actually stored on computer media and sent over transmission media.
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3 To transmit data, pulses of “high” and “low” voltage are sent across communications media. To store data, changes are induced in the magnetic polarity of the recording medium. These polarity changes are called flux reversals . The period of time during which a bit is transmitted, or the area of magnetic storage within which a bit is stored is called a bit cell . 2.A Introduction
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4 The simplest data recording and transmission code is the non-return-to-zero (NRZ) code. NRZ encodes 1 as “high” and 0 as “low.” The coding of OK (in ASCII) is shown below. 2.A.1 Non-Return-to-Zero Code
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The problem with NRZ code is that long strings of zeros and ones cause synchronization loss. Non-return-to-zero-invert (NRZI) reduces this synchronization loss by providing a transition (either low-to-high or high-to-low) for each binary 1. 2.A.2 Non-Return-to-
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Ch02A_ECOA2e - Chapter 2 Special Section Focus on Codes for...

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