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Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. A digital filter uses a digital processor to perform numerical calculations on sampled values of the signal. The analog input signal must first be sampled and digitized. The resulting binary numbers, representing successive sampled values of the input signal, are transferred to the processor, which carries out numerical calculations on them. These calculations typically involve multiplying the input values by constants and adding the products together. If necessary, the results of these calculations, which now represent sampled values of the filtered signal, are output to convert the signal back to analog form. To achieve the desired filtering effect, Digital filters can achieve virtually any filtering effect that can be expressed as a mathematical function or algorithm.

The Designing of a FIR Low Pass Filter and Amplifier for Small Voltage Signals using Kaiser Window