Chapter 3 Book Notes - 1 CNT 3004 Chapter 3 Notes To be...

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1 CNT 3004 – Chapter 3 Notes To be transmitted, data must be transformed to electromagnetic signals. Data can be analog or digital Analog data – refers to information that is continuous . Analog data take on continuous values. infinite Digital data – refers to information that has discrete states. Digital data take on discrete values. limited Signals can be analog or digital. Analog signals can have an infinite number of values in a range Digital signals can have only a limited number of values. Both analog and digital signals can take one of two forms: periodic or non-periodic Periodic signal completes a pattern within a measurable time frame called a period and repeats that pattern over subsequent identical periods. Repeatable Cycle – the completion of one full pattern Non-periodic signal – changes without exhibiting a pattern or cycle that repeats over time. In data communications we commonly use periodic analog signals because they need less bandwidth and non-periodic digital signals because they can represent variation in data. Periodic analog signals can be classified as simple or composite . A simple periodic analog signal, a sine wave , cannot be decomposed into simpler signals. The sine wave is the most fundamental form of a periodic analog signal. A composite periodic analog signal is composed of multiple sine waves. A sine wave can be represented by 3 parameters: (1) the peak amplitude (2) the frequency and (3) the phase (1) Peak Amplitude [A] – the absolute value of its highest intensity, proportional to the energy it carries. Normally measured in Volts. The maximum strength of signal. (2) Frequency – refers to the number of periods in 1s. Normally expressed in Hertz (Hz). The rate of change of with respect to time. Change in a short span of time means high frequency . Change over a long span of time means
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This note was uploaded on 10/05/2010 for the course CNT CNT 3004 taught by Professor K during the Spring '10 term at University of Central Florida.

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Chapter 3 Book Notes - 1 CNT 3004 Chapter 3 Notes To be...

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