BDC5eChapter2 - Chapter 2 Business Information Business...

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Chapter 2 : Business Information Business Data Communications, 5e
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Analog Data Continuous signal Expressed as an oscillation (sine wave format) of frequency Information rate and channel capacity are measured in hertz (Hz) of bandwidth (1 Hz = 1 cycle per second).
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Basic Analog Terms Wave frequency: Number of times a cycle occurs in given time period Wave amplitude: Height of a wave cycle Hertz (Hz): The number of times a wave cycle occurs in one second (commonly used measure of frequency)
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Types of Information Audio Data Image Video
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Understanding Audio What makes sound? Vibration of air How can we record that vibration? How can we convert that to an electrical signal?
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Digital Audio For good representation, must sample amplitude at a rate of at least twice the maximum frequency Measured in samples per second, or smp/sec Telephone quality: 8000smp/sec, each sample using 8 bits 8 bits * 8000smp/sec = 64kbps to transmit CD audio quality: 44000smp/sec, each sample using 16 bits 16 bits * 44000smp/sec = 1.41mbps to transmit clearly
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This note was uploaded on 04/27/2010 for the course BAMU BSC taught by Professor Kmm during the Spring '10 term at University of New York in Prague.

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BDC5eChapter2 - Chapter 2 Business Information Business...

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