Today, signals i.e. quantities that fluctuate over a period of time with usually with high frequency have acquired a great amount of importance and are being used in many fields especially in communication. Digital signal processing involves conversion of digital data into signals thus, making its transfer easier and subsequently converting these signals back into the original form.
A signal has many characteristics or domains such as time domain, spatial domain, frequency, wavelet domain etc. Any one among these can be used to process a respective signal. From among these, the engineer usually selects the one that best represents the characteristics of the signal concerned or in other words, the one from which data can be obtained easily. In order to ascertain the required characteristic, the engineer may try out many among these properties.
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