Audio information communication is an important task in multimedia. Sound is a form of longitudinal wave motion and its amplitude changes with time. The first step in digitization of audio signal is sampling where measurements are taken at evenly spaced intervals. The rate at which sampling is performed is called sampling frequency. For audio digitization, sampling rates ranges from 8KHz to 48 KHz. For better results, we follow Nyquist rate. Here sampling rate is maintained at a level which is equal to twice the maximum frequency content in the signal. Other important terms in this category are signal to noise ratio, signal to quantization noise ratio, linear and non linear quantization, audio quality versus data rate, audio filtering, synthetic sounds, coding of audio, pulse code modulation, differential coding, lossless predictive coding etc.
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