Data Coding
Content:
Digital Data Digital Signals
A digital signal is a sequence of discrete, discontinuous voltage pulses, where each pulse is a signal element. Binary data is transmitted by encoding each bit of data in each signal element. This transmission is the least complicated and expensive with reference to the others.
The tasks involved in interpreting the digital signals at the receiver are:
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The receiver must know or determine the duration of each bit (when each bit begins and ends)
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The receiver must determine whether the level for each bit is high or low.
The factors that determine the success or failure of the receiver in interpreting the input signal are:
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The signal noise ratio
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The transmission speed and
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bandwidth
Coding Schemes
An encoding scheme is simply the mapping of data bits to signal elements.