Transfers information from one location to another -- it can be conveyed through sound, light, variation of current…
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Advantages of digital signals
Noise can be filtered out without loss of detail
Can be altered/processed
Can be reproduced in mass for relatively low cost
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Sampling
The process in which the displacement of a continuous/analogue signal is measured at small time intervals and turned into a digital string of binary numbers (samples)
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Quantisation levels
The different levels to represent the signal value for any sample
2^b , where b is the number of bits each sample is coded with
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Quantisation error
The difference between the signal value and the quantisation level
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Number of useful quantisation levels
total noisy signal variation/noise variation
2^b = V(total)/V(noise)
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Resolution
The smallest change in potential difference that can be determined
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