In quest to design a digital filter, it is important to follow a step by step guideline from specification to implementation. Each option of the design process is open for all designers. Most digital signals process experts apply some digital filter theory especially reflecting the considerable research effort, approximation for finding useful method of calculating filter coefficient.
It is a network or a precise system by which we can change the wave shape, amplitude, phase, frequency and other characteristics of the signal in a desired manner. The main objectives of using the filter in digital signal processing are to improve the signal quality by reducing noise, to extract or to combine the desired portion of the signal. Basically in signal processing technology, it is an algorithm which is implemented in software and hardware to generate digital output signal from the input signal obviously in a desired manner. It performs on a routine filtering algorithm representing some variables, numbers or digitized analog signals on specific hardware or software.
There are few steps in real time digital filter with analog input. First, band limiter limits the analog signal in order to periodic sample and convert into series of binary sample. Second, a processor is used to process these input sequences into output sequences with some sorts of computational mathematical algorithm. After that, the processed signal converts in analog signal reducing some unwanted components.