大小写数字翻译（数字大写翻译器）

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1、Digital filter in digital signal processing plays a very important role, used for signal filtration, detection and parameter estimation etc., is the most widely used a linear system. Realizing digital filter, there are two ways, one is to adopt the computer software, is to finish the work by the program to make the computer to realize; 2 it is design the special-purpose digital processing hardware. Here we use is the first method is that the MATLAB provide signal processing toolbox to realize digital filter. This paper first introduces IIR digital filter and its transfer function, and then introduced the MATLAB related knowledge and expounded based on the MATLAB three means of realization: based on simulated prototype design, direct design method, the general Butterworth design method. This paper mainly introduces various steps: analog simulation prototype filter design, frequency conversion, discretization of. These design method for digital filters designed to bring new means of realization, the design is very fast and convenient, simulation waveform intuitive.。

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