ABSTRACT
Traditional digital filter design process complex, the computation workload is
big, the filter characteristic adjustment difficulty, has affected its application. This
article introduced one kind using the MATLAB signal processing toolbox (Signal
Processing Toolbox) the fast effective design the conventional numeral filter design
method which is composed by software. Produced has used the MATLAB language to
carry on the programming and carries on contact surface design using the signal
processing toolbox FDA Tool . the detailed step. Using the MATLAB design filter,
may contrast the design request and the filter characteristic adjustment parameter as
necessary direct-viewing is simple, enormous reduced the work load, is advantageous
optimization which designs to the filter.
Digital filter is one of the most important part of the digital signal Processing. In
many fields of science and technology, it is widely used for signal processing. Digital
filter is a kind of installation that is made of digital multiplier, adder and the unit of
delay time. Digital filter is a discrete time system. Its function is to carry out the
digital code of the input dispersed signal so as to change signal frequency spectrum.
MATLAB-based digital filter has two design methods: interface design and direct
design.
Key words :Digital filter; MATLAB; IIR ; FIR
