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we can code analog signals to digital signals through Binary Digits i.e... 0 and 1
Through Pulse code modulation .. that consist od sampling , quantization translation
Using A/D which is consisting of three stages
First : Sampling which is must be comply with the Nyquest rate (Higher sampling rate >> Easier & Accurate reconstruction)
Second : Quantization to put each sample at a certain level (More levels >> Higher accuracy)
Encoding : To translate each quantizied sample into bits (No. of bits = 2 to power of quantization levels)