數(shù)字濾波器外文翻譯-其他專業(yè)-資料下載頁
2025-01-19 11:51本頁面
【導(dǎo)讀】作為一種電子濾波器，數(shù)位濾波器與完全工作在模擬信號域的模擬濾波器。數(shù)字濾波器工作在數(shù)字信號域，它處理的對象是經(jīng)由采樣器件將模擬信號。輸入的數(shù)字信號進(jìn)行運(yùn)算和處理，從而實(shí)現(xiàn)設(shè)計(jì)要求的特性。數(shù)字濾波器理論上可以實(shí)現(xiàn)任何可以用數(shù)學(xué)算法表示的濾波效果。器的兩個(gè)主要限制條件是它們的速度和成本。但是隨著集成電路成本的不斷降低，數(shù)字濾波器變得越。數(shù)字濾波器一般由寄存器、延時(shí)器、加法器和乘法器等基本數(shù)字電路實(shí)現(xiàn)。按照數(shù)字濾波器的特性，它可以被分為線性與非線性、因果與非因果、無限脈沖響應(yīng)與有限脈沖響應(yīng)等等。時(shí)不變的數(shù)字濾波器是最基本的類型；而由于數(shù)字系統(tǒng)可以對延時(shí)器加以利用，數(shù)字濾波器相比模擬濾波器有更高的信噪比。字系統(tǒng)輸入端的模數(shù)轉(zhuǎn)換過程中產(chǎn)生的量化噪聲。數(shù)字濾波器還具有模擬濾波器不能比擬的可靠性。組成模擬濾波器的電子元。在，IIR濾波器的脈沖響應(yīng)為無限長，因此得名。應(yīng)的長度為N+1，故而被稱作FIR濾波器。
【正文】 FIR filter. Linear moving constant digital filter, including an infinite long impulse response filter (IIR filter) and limited long impulse response filter (FIR filter) two kinds. These two kinds of filter system function can be unified with Z transformation expressed as: The advantages of IIR filter is that its design can directly using simulation filter design results, because analog filter itself is an infinite long impulse response. Usually IIR filter design process are as follows: first of all, according to the requirements of the design parameters of the corresponding filters simulated filter (such as bart hepworth filter, chebyshev filters, etc), and then by mapping (such as pulse response don39。t strain and bilinear map, etc.) will transform into digital filter simulated filter, to decide IIR filter parameters. The major disadvantage is IIR filter, because it has feedback its stability cannot be guaranteed. In addition, feedback still make IIR filter number operations may overflow. FIR filter is the most important advantages, because they do not exist system poles, FIR filters is absolutely stable system. FIR filter also ensures that the linear phase in signal processing, this also is very important. In addition, because do not need feedback, the realization of FIR filters than IIR filter simple. FIR filter39。s weakness is its performance as the same order number IIR filter, but due to the rapid development of digital puting hardware, this is not a problem. Plus introducing puter aided design, the design of FIR filters have also been great simplified.
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