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CHAPTER 6B - Coggle Diagram
CHAPTER 6B
4) Pulse Code Modulation
info signal is sampled as in PAM system, amplitude of each sample is then represented by a binary code
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send more binary digits, high transmission bandwidth
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within time slot, binary code is transmitted as a digital code
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TRANSMISSION OF SIGNALS
1) Analog Signal
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to restore signal amplification,add amplifiers (repeaters),now :optical amplifiers
2) Digital Transmission
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increase regenarator spacing: allow signal to become very small before there is any danger of it becoming lost in noise
CONVERT INFO SIGNAL TO DIGITAL FORM: Measure amplitude of input waveform at regular intervals measurements (samples)
-sampling must be much faster than signal frequency
-sampling rate 2x highest frequency
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