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To convert an analog signal to a digital one, you must sample the analog signal at a rate higher than twice of the signal bandwidth (Nyquist criteria). Then quantize the samples using known methods like successive approximation register, dividing the interval between the minimum and maximum values into N=2^k equal segments those you can give for each of the segments a k-bit digit.
If you need non-uniform quntization, you have to use a non-linear system, like A-Law or µ-Law before the uniform quantizer.
i hav a question raised here ... the sampled signal is also an analog signal ...so the previous answers which statedf that the question is unclear is wrong concept.................
simple answer is u need a quantiser,..........
Analog signal -------------------->>>> continuos in time , amplitude
sampled analog.......................>>>>continuos in only amplitude..but discrete in time.
digital signal...........................>>>>>> dicrete in both amplitude and time
quantization is acquiring the analog as discrete. So youfirst set the number of levels and after sampling the signal compare each value with the level set and have the value(amplitude) of the as one of the value which is an integral multiple of the quantisation level.
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