Essentially, process of analog to digital conversion allows for an analog signal to be converted into a digital signal which can be stored in a computer for required processing. Analog signal are ‘real world’ signals and need to be digitized in discrete forms in order for the computer to be able to manipulate the data. This approach offers many advantages over the older traditional non-computerized methods. One of the key processes involved in the process of Analog to Digital Conversion is sampling.
Given that an analog signal is continuously changing in time, the conversion to discrete digital forms requires that an arbitrarily given value that is within the range of the signal be obtained by measuring values at the right point in the waveform. The object of Analog to Digital conversion is to convert the convert the continuous signal into digital representation and this is done by sampling the signal. The digital signal therefore, is a sampled signal obtained by sampling the analog signal at discrete points in time. These points are usually evenly spaced in time, with the time between being referred to as the sampling interval.