【正文】 uanchengxu the construction of new procedures to prepare themselves for kits. 中文翻譯 數(shù)字濾波器的仿真與實現(xiàn) 隨著信息時代和數(shù)字世界的到來 ， 數(shù)字信號處理已成為當今一門極其重要的學科和技術(shù)領(lǐng)域。 看 到一個數(shù)字 濾波器 ,信號是由一系列數(shù)字 組成 ,而不是電壓或 電流。 A1 (f) A2 (f) 1 1 0 f2c f 0 f 2c f (a) (b) A3 (f) A4 (f) 1 1 0 f1c f2c f 0 f1c f2c f (c) (d) 圖中四類濾波器的幅頻特性 (a)低通 (b)高通 (c)帶通 (d)帶阻 數(shù)字濾波器的設(shè)計 數(shù)字濾波器設(shè)計的 基本要求 ， 數(shù)字濾波器設(shè)計要經(jīng)過三個步驟： （ 1）確定指標：在設(shè)計一個濾波器前，必須有一些指標。除具備卓越的數(shù)值計算能力外，它還提供了專業(yè)水平 的符號計算，文字處理，可視化建模仿真和實時控制等功能。 。根據(jù)這個描述用硬件或者計算機軟件來實現(xiàn)它。由此可知， FIR 濾波器應(yīng)用比較廣，而 IIR 濾波器則用 在相位要求不是很嚴格的場合。 這些計算通常涉及多方面的投入和增加產(chǎn)品 取值 的共同因素 。 Linear phase if required, will use the entire work phasecorrection. Image processing and transmission of data collection is required with linear phase filters identity. And FIR linear phase digital filter to achieve, but an arbitrary margin characteristics. Impact from the digital filter response of the units can be divided into two broad categories : the impact of the limited response (FIR) filters, and unlimited number of shocks to (IIR) digital filters. FIR filters can be strictly linear phase, but because the system FIR filter function extremity fixed at the original point, it can only use the higher number of bands to achieve their high selectivity for the same filter design indicators FIR filter called band than a few highIIR 510 times, the cost is higher, Signal delay is also larger. But if the same linear phase, IIR filters must be workwide calibration phase, the same section also increase the number of filters and work plexity. FIR filters can be used to achieve nonDigui way, not in a limited precision of a shock, and into the homes and quantitative factors of uncertainty arising from the impact of errors than IIR filter small number, and FIR filter can be used FFT algorithms, the putational speed. But unlike IIR filter can filter through the simulation results, there is no readymade formula FIR filter must use puteraided design software (such as MATLAB) to calculate. So, a broader application of FIR filters, and IIR filters are not very strict requirements on occasions. Unit from subfunctions can be divided into the following four categories : (1) Lowfilter (LPF) (2) highfilter (HPF) (3) beltfilter (BPF) (4) to prevent filter (BSF) The following chart dotted line for the ideals of the filter frequency characteristics : A1 (f) A2 (f) 1