Pulse code Modulation the involves Sampling,Quantization, and Reconstruction.
Pulse code modulation techinique basically involves Sampling , Quantization , Reconstruction.
SAMPLING : The analog signal is sampled by multiplying it with an impulse train generates all the sample values.
QUANTIZATION : The sample values being only discrete in Time must also be made discrete in Amplitude also by the process of Quantization.
ACCORDING TO THE RULE OF QUANTIZATION
X[N] = rk if tk < X[n] < tk+1
X[n] Sampled value
rk - reconstruction level
tk - quantization levels
RECONSTRUCTION : Using a low pass butter worth filter of sufficient bandwidth and order = 2.