MatLab Based Design and Implemetation of Digita Filter

摘要

Digital filters are essential in the wider field of digital signal processing applications, such as spectrum analysis, digital image processing, and pattern recognition. In signal processing, the function of a filter is to remove unwanted parts of the signal, such as random noise, or to extract useful parts of the signal, such as the components lying within a certain frequency range. A digital filter uses a digital processor to perform numerical calculations on sampled values of the signal. The processor may be a general-purpose computer such as a PC, or a specialised DSP (Digital Signal Processor). With the basic building blocks at hand. Finite impulse response filters (FIR) and infinite impulse response filters (IIR) are the two principal techniques for filtering digital signals. The work is to design PC- based Digital Filter including the two principal techniques using the Graphical User Interface (GUI) for the Mat lab software front panel is designed as control panel involving all functions and tools necessary for filtering. Hardware requirements for interfacing the signal to the PC are considered and designed. The sound card used for signals in the audio range. External signals can be recorded, displayed, stored and processed.