17-08-2017, 09:33 AM
A programmable digital system allows flexibility in the reconfiguration of digital signal processing operations by changing the program. In analog hardware redesign is necessary. In digital precision depends on the length of the word, floating Vs fixed point arithmetic, etc. In analog depends on the components. It can be stored on disk. It is very difficult to perform accurate mathematical operations on the signals in analog form, but these operations can be implemented routinely on a digital computer using software. A signal is defined as any physical quantity that varies with time, space or another independent variable. A system is defined as a physical device that performs an operation on a signal. The system is characterized by the type of operation performed in the signal. Such operations are called signal processing.