【導(dǎo)讀】于降低噪聲、提高信噪比及信號的頻譜純度等方面有著重要的意義。數(shù)字濾波器根據(jù)單。根據(jù)不同的系統(tǒng)性能要求選擇不同的濾波器。目前濾波器的主要實現(xiàn)方法有三種，分別。建立濾波器模型，然后用SignalCompiler把Simulink的模型文件轉(zhuǎn)化為。硬件描述語言VHDL文件，最后利用QuartusII完成濾波器的仿真、配置、編譯和下載。本文最后用實例介紹了FIR數(shù)字濾波器和IIR數(shù)字濾波器的實現(xiàn)過程。

　　

【正文】 電子科技大學(xué)出版社， 2020。 [3]潘松，黃繼業(yè)。 EDA 技術(shù)與 VHDL，清華大學(xué)出版社， 2020。 [4]屈星，唐寧等。 基于 FPGA 的 IIR 數(shù)字濾波器的設(shè)計與仿真，計算機仿真，2020。 [5]彭雪峰，汪臨偉，許建平。基于 MATLAB 與 QuartusⅡ的 FIR 濾波器設(shè)計與驗證，電子設(shè)計工程， 2020。 [6]丁玉美，高西全。數(shù)字信號處理（第二版），西安電子科技大學(xué)出版社， 2020。 [7]張志恒 。 基于 Matlab 信號處理工具箱的數(shù)字濾波器設(shè)計與仿真 [J]， 電力學(xué)報， 2020。 [8]胡廣書。數(shù)字信號處理導(dǎo)論，清華大學(xué)出版社， 2020. [9]Uwe MeyerBaesc。 Digital Singal Processing with Field Programmable Gate Arrays,清華大學(xué)出版社， 2020。 [10]嚴(yán)三國。基于 VHDL 語言的八階 IIR 語音低通數(shù)字濾波器，桂林航天工業(yè)高等?？茖W(xué)校 電報， 2020。 [11]Vinay 。數(shù)字信號處理及其 MATLAB 實現(xiàn)，電子工業(yè)出版社， 1998。 [12]任愛峰等?；?FPGA 的嵌入式系統(tǒng)設(shè)計，西安電子科技大學(xué)出版社， 2020。 致謝 請刪除以下內(nèi)容， O(∩ _∩ )O謝謝！??！ boxing Fet the euphemistic ‘noble art of selfdefence’。 boxing is a human bloodsport in which the intention is to hurt one39。s opponents by delivering blows to their body and ultimately knocking them unconscious. It sanctions injury in the name of sport. That said, modern boxing appears almost genteel alongside its prizefighting predecessor in which bareknuckled pugilists fought to exhaustion, with fights often lasting several hours. A round ended only when one batant was floored。 he then had half a minute39。s respite before placing his toe on a line scratched across the centre of the ring and resuming battle. Not until one fighter failed ‘to e up to scratch’ was a result declared: no wins on points in those days, just the objective test of an inability to continue. Early rounds were often hard slogging contests but the real physical damage came in the later stages when tiredness slowed defensive reflexes. Imagine too the state of even the winner39。s hands, protected only by having been soaked in brine. With their bination of boxing and wrestling moves, early contests were literally ‘no holds barred’。 grappling, punching, tripping, and throwing all being used to floor an opponent. The widelyadopted Broughton39。s Rules of 1743 eradicated some of the barbarism by outlawing the hitting of a man when he was down, and the seizing of hair or the body below the waist, but they still permitted butting. Yet it was not the brutality of the prizering which brought its demise, but the corruption with which it became associated. The revival of the sport as boxing in late Victorian Britain saw several changes designed to render it more civilized. Although some of the old practices continued for a while — even the famous Queensbury Rules initially allowed endurance contests — by the turn of the century the general picture was one of boxing in gloves, limitedtime rounds, points decisions after a fixed number of rounds had elapsed, and weight divisions, though the latter have accentuated problems of dehydration as fighters struggle to ‘make the weight’. For much of the twentieth century the history of boxing has been one of crumbling resistance to changes intended to protect further the brains and bodies of participants. Between 1984 and 1993 eight boxers had died soon after fights in the UK。 bantamweight Bradley Stone was added to the list in 1994. Following a report from a medical working party, which included neurosurgeons, the British Boxing Board of Control subsequently introduced mandatory annual magic resonance imaging scans for all boxers to replace the less sophisticated puterized tomography which had been pulsory only for those fighting eight rounds or more. Additionally, any boxer knocked out must wait 45 days (previously 28) before he again enters the ring petitively, and he must also have a hospital check. Ringside doctors may advise referees on a fighter39。s condition between rounds and may remend that the contest be stopped. Doctors also examine each boxer at the conclusion of fights and paramedic teams must be on hand at all boxing bills. The medical profession in several countries has increasingly adopted an antiboxing stance, citing irreversible brain damage as its major objection to the sport. This is a key point for, in absolute terms of deaths and serious injuries, other sports such as horseracing, mountaineering, rugby, and even cricket appear more dangerous, but in none of them is deliberate and repeated striking of an opponent part of the rules of the game. In contrast a boxer has a licence for physical assault. The evidence is clear that repeated pummelling to the head can cause cumulative damage to the brain: here time is no great healer. Occasionally, acute brain injury can occur during a fight. The greatest danger es towards the end when a tired man with a loose neck has his head flipped back rapidly by a punch. This can tear a vein outside or inside the brain, which then leaks blood, causing pressure on the brain and eventually leading to a a. Only if the clot is removed rapidly can the fighter survive. Fighters now train harder。 their bodies are fitter — but their brains are no more resilient than in the past. Some nations, notably Sweden, have already banned boxing on medical grounds. So far the British government has been reluctant to follow the Swedish lead and since 1981 five private members39。 antiboxing Bills proposed in parliament have failed to reach the statute books. Most schools, both state and public, however, have dropped boxing from their physical education curriculum. Yet it should be noted that amateur boxing is exceptionally well regulated: not more than four rounds are fought, headguards are worn, and the referee is allowed to stop a fight to prevent serious injury. However, headguards, whilst absorbing energy from punches, present an even larger target to be hit and thus the number of blows striking home may well increase. Indeed, studies have shown that nonboxing sportsmen outperform even amateur fighters in neurological tests and, notwithstanding the safety precautions, three amateur fighters have suffered serious brain injury in British rings since 1988. For centuries boxing has been the epitome of overt masculinity, a demonstration of manliness an