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Digital can be obtained from analog in the following process.
1. sampling of analog
2. quantization
in sampling, analog waveform is multiplied with dirac delta function.
in quantization, give certain level to various level.
in encoding, encode the obtained number with combination of digital number 1 & 0.
nowadays due to fidelity of the device, digital has replaced analog.
digital has following advantage over anlog:
1. encription
2. multiplexing
4. handeled in group.

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