村田(tian)(tian)濾(lv)波(bo)(bo)(bo)器(qi)(qi)概(gai)括：村田(tian)(tian)濾(lv)波(bo)(bo)(bo)器(qi)(qi)是(shi)(shi)一種選(xuan)頻(pin)裝置，可(ke)以使(shi)信(xin)號(hao)(hao)中(zhong)特(te)(te)定的(de)(de)(de)頻(pin)率(lv)成(cheng)分(fen)通過(guo)(guo)，而(er)極大(da)地衰減其他頻(pin)率(lv)成(cheng)分(fen)。利(li)用(yong)(yong)(yong)村田(tian)(tian)濾(lv)波(bo)(bo)(bo)器(qi)(qi)的(de)(de)(de)這種選(xuan)頻(pin)作用(yong)(yong)(yong)，可(ke)以濾(lv)除干擾噪聲或進行頻(pin)譜分(fen)析。換(huan)句話說，凡是(shi)(shi)可(ke)以使(shi)信(xin)號(hao)(hao)中(zhong)特(te)(te)定的(de)(de)(de)頻(pin)率(lv)成(cheng)分(fen)通過(guo)(guo)，而(er)極大(da)地衰減或抑制其他頻(pin)率(lv)成(cheng)分(fen)的(de)(de)(de)裝置或系統都(dou)稱(cheng)之(zhi)為(wei)(wei)濾(lv)波(bo)(bo)(bo)器(qi)(qi)。村田(tian)(tian)濾(lv)波(bo)(bo)(bo)器(qi)(qi)，是(shi)(shi)對(dui)波(bo)(bo)(bo)進行過(guo)(guo)濾(lv)的(de)(de)(de)器(qi)(qi)件。“波(bo)(bo)(bo)”是(shi)(shi)一個(ge)非常(chang)廣泛的(de)(de)(de)物(wu)理(li)概(gai)念，在電(dian)(dian)子(zi)技術領域，“波(bo)(bo)(bo)”被(bei)狹義地局限于特(te)(te)指描述各種物(wu)理(li)量的(de)(de)(de)取(qu)值隨時間起(qi)伏變化的(de)(de)(de)過(guo)(guo)程(cheng)。該(gai)過(guo)(guo)程(cheng)通過(guo)(guo)各類(lei)傳感(gan)器(qi)(qi)的(de)(de)(de)作用(yong)(yong)(yong)，被(bei)轉換(huan)為(wei)(wei)電(dian)(dian)壓或電(dian)(dian)流的(de)(de)(de)時間函數，稱(cheng)之(zhi)為(wei)(wei)各種物(wu)理(li)量的(de)(de)(de)時間波(bo)(bo)(bo)形，或者稱(cheng)之(zhi)為(wei)(wei)信(xin)號(hao)(hao)。因為(wei)(wei)自變量時間是(shi)(shi)連續(xu)(xu)取(qu)值的(de)(de)(de)，所以稱(cheng)之(zhi)為(wei)(wei)連續(xu)(xu)時間信(xin)號(hao)(hao)，又習慣地稱(cheng)之(zhi)為(wei)(wei)模擬信(xin)號(hao)(hao)(Analog Signal)。濾(lv)波(bo)(bo)(bo)是(shi)(shi)信(xin)號(hao)(hao)處理(li)中(zhong)的(de)(de)(de)一個(ge)重要概(gai)念，在直(zhi)流穩壓電(dian)(dian)源(yuan)中(zhong)濾(lv)波(bo)(bo)(bo)電(dian)(dian)路的(de)(de)(de)作用(yong)(yong)(yong)是(shi)(shi)盡可(ke)能減小(xiao)脈動的(de)(de)(de)直(zhi)流電(dian)(dian)壓中(zhong)的(de)(de)(de)交流成(cheng)分(fen)，保(bao)留其直(zhi)流成(cheng)分(fen)，使(shi)輸出電(dian)(dian)壓紋波(bo)(bo)(bo)系數降(jiang)低(di)，波(bo)(bo)(bo)形變得比較平(ping)滑。