當會議(yi)系統(tong)音響設備故障時(shi)，該如何(he)是好?現在，小編就(jiu)為大家簡單的介紹一下(xia)，會議系統音響設備在發生故障的時(shi)候，該如何(he)去判斷和排除。

該圖片由注冊用戶"我是我的王"提供，版權聲明反饋

一、會議系統音響無聲故障的判斷與排除

1、檢(jian)查(cha)所有設備(bei)(bei)是否都(dou)已(yi)開(kai)(kai)啟，各(ge)設備(bei)(bei)的音(yin)量控制(zhi)鈕是否都(dou)已(yi)調(diao)到合(he)適位置，調(diao)音(yin)臺(tai)上各(ge)通道路徑開(kai)(kai)關是否已(yi)選通，檢(jian)查(cha)各(ge)連接線是否已(yi)連接正確、可(ke)靠。

2、如(ru)(ru)還無(wu)聲則(ze)需逐(zhu)(zhu)級(ji)(ji)(ji)檢(jian)查(cha)(cha)，可(ke)以(yi)從后(hou)(hou)向(xiang)前(qian)逐(zhu)(zhu)級(ji)(ji)(ji)檢(jian)查(cha)(cha)，也可(ke)從前(qian)向(xiang)后(hou)(hou)逐(zhu)(zhu)級(ji)(ji)(ji)檢(jian)查(cha)(cha)。從前(qian)向(xiang)后(hou)(hou)查(cha)(cha)時(shi)，首先(xian)用(yong)(yong)(yong)監聽耳機(ji)檢(jian)查(cha)(cha)信號是(shi)(shi)否已進(jin)人(ren)(ren)(ren)調音(yin)臺(tai)，然后(hou)(hou)可(ke)以(yi)用(yong)(yong)(yong)電壓表(biao)、萬用(yong)(yong)(yong)表(biao)逐(zhu)(zhu)級(ji)(ji)(ji)檢(jian)查(cha)(cha)，直(zhi)至(zhi)查(cha)(cha)出(chu)(chu)無(wu)聲的(de)(de)一(yi)級(ji)(ji)(ji)并判斷(duan)是(shi)(shi)設(she)(she)(she)備無(wu)輸(shu)出(chu)(chu)，還是(shi)(shi)連線(xian)有(you)問題(ti)。如(ru)(ru)確屬(shu)設(she)(she)(she)備故障(zhang)(zhang)，則(ze)應更換(huan)(huan)備用(yong)(yong)(yong)設(she)(she)(she)備以(yi)救急(ji);如(ru)(ru)果(guo)屬(shu)于(yu)周(zhou)邊(bian)設(she)(she)(she)備出(chu)(chu)現(xian)故障(zhang)(zhang)，在(zai)沒有(you)備用(yong)(yong)(yong)設(she)(she)(she)備的(de)(de)情況下，可(ke)以(yi)直(zhi)接將出(chu)(chu)故障(zhang)(zhang)的(de)(de)周(zhou)邊(bian)設(she)(she)(she)備跳過(guo)。例如(ru)(ru)均衡器(qi)出(chu)(chu)現(xian)故障(zhang)(zhang)了，則(ze)可(ke)以(yi)將輸(shu)人(ren)(ren)(ren)到均衡器(qi)的(de)(de)輸(shu)人(ren)(ren)(ren)線(xian)插頭拔出(chu)(chu)來(lai)加到后(hou)(hou)一(yi)級(ji)(ji)(ji)設(she)(she)(she)備的(de)(de)輸(shu)人(ren)(ren)(ren)插座(zuo);如(ru)(ru)果(guo)是(shi)(shi)調音(yin)臺(tai)的(de)(de)某一(yi)輸(shu)人(ren)(ren)(ren)通(tong)道(dao)出(chu)(chu)現(xian)故障(zhang)(zhang)，則(ze)可(ke)以(yi)換(huan)(huan)一(yi)路輸(shu)人(ren)(ren)(ren)通(tong)道(dao).直(zhi)到活動結束后(hou)(hou)再(zai)更換(huan)(huan)設(she)(she)(she)備;如(ru)(ru)屬(shu)連接線(xian)有(you)問題(ti)，則(ze)在(zai)急(ji)用(yong)(yong)(yong)時(shi)先(xian)換(huan)(huan)備用(yong)(yong)(yong)線(xian)，然后(hou)(hou)有(you)空(kong)時(shi)再(zai)修(xiu)理設(she)(she)(she)備和連接線(xian)。對于(yu)設(she)(she)(she)備，如(ru)(ru)自(zi)己不熟悉(xi)設(she)(she)(she)備內部結構、原理時(shi)不要輕(qing)易動手修(xiu)理，以(yi)免(mian)小故障(zhang)(zhang)變成(cheng)大故障(zhang)(zhang)當用(yong)(yong)(yong)電容麥克風時(shi)，還應檢(jian)查(cha)(cha)幻像電源是(shi)(shi)否加上。

二、會議音響系統中哼聲大的判斷與排除

哼(heng)(heng)聲(sheng)(sheng)(sheng)往(wang)往(wang)是(shi)由(you)于(yu)(yu)接(jie)(jie)地(di)(di)不(bu)(bu)良或(huo)不(bu)(bu)對(dui)(dui)，系(xi)(xi)統(tong)(tong)的(de)(de)(de)(de)(de)設備(bei)不(bu)(bu)在(zai)同(tong)一(yi)(yi)路電(dian)(dian)網上，地(di)(di)電(dian)(dian)位嚴(yan)重相差引(yin)起的(de)(de)(de)(de)(de)，而(er)連(lian)接(jie)(jie)線(xian)的(de)(de)(de)(de)(de)屏(ping)蔽層(ceng)脫焊或(huo)屏(ping)蔽線(xian)接(jie)(jie)得不(bu)(bu)對(dui)(dui)而(er)形(xing)成地(di)(di)電(dian)(dian)流回路，也會(hui)引(yin)起哼(heng)(heng)聲(sheng)(sheng)(sheng)大。所以應著重檢查這些(xie)方面，必要時應加(jia)隔(ge)離(li)用(yong)(yong)音(yin)頻變壓(ya)器(qi)，以便把前后級設備(bei)間的(de)(de)(de)(de)(de)“地(di)(di)”斷開，而(er)信號仍然暢通。尤其(qi)是(shi)在(zai)兩(liang)個系(xi)(xi)統(tong)(tong)之間相連(lian)接(jie)(jie)時，往(wang)往(wang)會(hui)由(you)于(yu)(yu)兩(liang)個系(xi)(xi)統(tong)(tong)不(bu)(bu)用(yong)(yong)同(tong)一(yi)(yi)電(dian)(dian)源而(er)引(yin)起兩(liang)個系(xi)(xi)統(tong)(tong)之間的(de)(de)(de)(de)(de)地(di)(di)電(dian)(dian)位不(bu)(bu)同(tong)，有時甚(shen)至非(fei)常(chang)嚴(yan)重，從而(er)產生明顯的(de)(de)(de)(de)(de)哼(heng)(heng)聲(sheng)(sheng)(sheng)。對(dui)(dui)這種原(yuan)因引(yin)起的(de)(de)(de)(de)(de)非(fei)常(chang)容(rong)易判斷，只要將兩(liang)個系(xi)(xi)統(tong)(tong)之間的(de)(de)(de)(de)(de)連(lian)接(jie)(jie)信號線(xian)插頭從一(yi)(yi)個系(xi)(xi)統(tong)(tong)拔(ba)掉，哼(heng)(heng)聲(sheng)(sheng)(sheng)馬上會(hui)消失(shi)。如果確認哼(heng)(heng)聲(sheng)(sheng)(sheng)是(shi)由(you)于(yu)(yu)兩(liang)個系(xi)(xi)統(tong)(tong)電(dian)(dian)源的(de)(de)(de)(de)(de)地(di)(di)電(dian)(dian)位不(bu)(bu)同(tong)引(yin)起的(de)(de)(de)(de)(de)，則可以采取將兩(liang)個系(xi)(xi)統(tong)(tong)的(de)(de)(de)(de)(de)“地(di)(di)”隔(ge)離(li)的(de)(de)(de)(de)(de)方法，通常(chang)用(yong)(yong)加(jia)隔(ge)離(li)用(yong)(yong)音(yin)頻變壓(ya)器(qi)來達到目的(de)(de)(de)(de)(de)對(dui)(dui)隔(ge)離(li)用(yong)(yong)音(yin)頻變壓(ya)器(qi)的(de)(de)(de)(de)(de)技術要求(qiu)是(shi):

①一(yi)、二(er)次繞組用同樣規格的導線(xian)繞制，圈數比為1：1;

②輸人阻(zu)抗和輸出阻(zu)抗均為600Ω;

③諧波失(shi)真不大于10%;

④頻率響應在(zai)40Hz~16kHz范圍內優于士0.5dB;

⑤功率最好不(bu)小于100mW。

三、會議音響系統中削波失棄的判斷與排除

首先(xian)檢查各設(she)(she)備上的(de)(de)削(xue)(xue)波指(zhi)示燈是(shi)(shi)否(fou)亮(liang)著，如(ru)(ru)并未(wei)發現削(xue)(xue)波指(zhi)示燈連續(xu)亮(liang)，則可以選擇系統靠中間的(de)(de)一臺設(she)(she)備把音(yin)量(liang)降(jiang)低幾個dB.以判斷是(shi)(shi)該設(she)(she)備的(de)(de)前(qian)面(mian)已有(you)削(xue)(xue)波失(shi)真，還是(shi)(shi)在該設(she)(she)備后面(mian)才(cai)產(chan)生的(de)(de)削(xue)(xue)波失(shi)真。如(ru)(ru)此經(jing)過幾次調節音(yin)量(liang)控制器，即可判斷削(xue)(xue)波來(lai)(lai)自(zi)哪一級(ji)。一般來(lai)(lai)說，確實(shi)是(shi)(shi)信(xin)號過強(qiang)引起(qi)的(de)(de)削(xue)(xue)波，則應(ying)在前(qian)級(ji)設(she)(she)備上就將音(yin)量(liang)電平降(jiang)下來(lai)(lai)，如(ru)(ru)屬設(she)(she)備故障(zhang)(如(ru)(ru)設(she)(she)備內(nei)的(de)(de)工作電源不正常或(huo)負反饋(kui)通路(lu)開路(lu)等)則必(bi)須(xu)更換設(she)(she)備。

四、會議音響系統中聲音小的判斷與排除

在對各臺設(she)備(bei)(bei)(bei)的操作都符(fu)合規范的情況下，聲(sheng)(sheng)音(yin)小(xiao)往(wang)往(wang)是(shi)(shi)連(lian)接(jie)(jie)線(xian)問題居多。如連(lian)接(jie)(jie)線(xian)短路(lu)，插頭、插座配(pei)合不(bu)好，連(lian)線(xian)虛焊等，在判(pan)定(ding)連(lian)接(jie)(jie)線(xian)沒有問題后再懷(huai)疑設(she)備(bei)(bei)(bei)，檢查是(shi)(shi)那一臺設(she)備(bei)(bei)(bei)有了(le)故障，然(ran)后再更換設(she)備(bei)(bei)(bei)。如聲(sheng)(sheng)音(yin)小(xiao)還伴(ban)隨聲(sheng)(sheng)場嚴重不(bu)均(jun)勻則應考(kao)慮揚聲(sheng)(sheng)器(qi)的相位是(shi)(shi)否接(jie)(jie)錯。

五、會議音響系統中干擾噪聲

有時在一些地區的擴聲系統中可以聽到廣播電臺的聲音，或者其他干擾聲。例如來自雷達、高頻熱合機、電焊機等的(de)干擾聲(sheng)(sheng)，統(tong)(tong)稱為噪(zao)聲(sheng)(sheng)。有(you)時(shi)一套(tao)擴(kuo)(kuo)聲(sheng)(sheng)系(xi)(xi)統(tong)(tong)安(an)裝完(wan)，調試時(shi)可能聽到(dao)音(yin)箱中(zhong)(zhong)(zhong)發出間隙性雜音(yin)，甚至(zhi)出現廣播(bo)電(dian)(dian)(dian)(dian)(dian)臺的(de)播(bo)音(yin)聲(sheng)(sheng)，這些聲(sheng)(sheng)音(yin)往(wang)往(wang)是由于(yu)空間有(you)較(jiao)強(qiang)的(de)(被(bei)(bei)調制(zhi)的(de))高(gao)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)磁(ci)波(bo)，擴(kuo)(kuo)聲(sheng)(sheng)系(xi)(xi)統(tong)(tong)接收到(dao)這些被(bei)(bei)調制(zhi)的(de)高(gao)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)磁(ci)場(chang)后(hou)(hou)產生高(gao)頻(pin)(pin)(pin)感應電(dian)(dian)(dian)(dian)(dian)動(dong)勢—高(gao)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)，然(ran)后(hou)(hou)這個高(gao)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)通(tong)過擴(kuo)(kuo)聲(sheng)(sheng)系(xi)(xi)統(tong)(tong)電(dian)(dian)(dian)(dian)(dian)子電(dian)(dian)(dian)(dian)(dian)路中(zhong)(zhong)(zhong)的(de)例如晶(jing)(jing)體二極(ji)管(guan)(guan)、晶(jing)(jing)體三極(ji)管(guan)(guan)、場(chang)效應管(guan)(guan)、集成電(dian)(dian)(dian)(dian)(dian)路等非(fei)線(xian)性元器(qi)件(jian)構(gou)成的(de)電(dian)(dian)(dian)(dian)(dian)路對高(gao)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)進(jin)行解(jie)(jie)調，將(jiang)寄(ji)生于(yu)高(gao)頻(pin)(pin)(pin)信(xin)號(hao)(hao)中(zhong)(zhong)(zhong)的(de)音(yin)頻(pin)(pin)(pin)調制(zhi)信(xin)號(hao)(hao)解(jie)(jie)調出來(lai)，這里高(gao)頻(pin)(pin)(pin)信(xin)號(hao)(hao)相(xiang)當于(yu)被(bei)(bei)調制(zhi)的(de)載波(bo)信(xin)號(hao)(hao)，而寄(ji)生于(yu)這些高(gao)頻(pin)(pin)(pin)信(xin)號(hao)(hao)中(zhong)(zhong)(zhong)的(de)音(yin)頻(pin)(pin)(pin)信(xin)號(hao)(hao)相(xiang)當于(yu)調制(zhi)波(bo)信(xin)號(hao)(hao)，如果我們的(de)擴(kuo)(kuo)聲(sheng)(sheng)系(xi)(xi)統(tong)(tong)設計不是很到(dao)位，則(ze)可能將(jiang)射(she)頻(pin)(pin)(pin)無(wu)線(xian)電(dian)(dian)(dian)(dian)(dian)高(gao)頻(pin)(pin)(pin)干擾信(xin)號(hao)(hao)通(tong)過連(lian)接線(xian)較(jiao)多地接收進(jin)來(lai)，然(ran)后(hou)(hou)由于(yu)擴(kuo)(kuo)聲(sheng)(sheng)設備電(dian)(dian)(dian)(dian)(dian)路的(de)非(fei)線(xian)性，將(jiang)這些高(gao)頻(pin)(pin)(pin)無(wu)線(xian)電(dian)(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)進(jin)行解(jie)(jie)調，從而產生可感覺到(dao)的(de)音(yin)頻(pin)(pin)(pin)干擾信(xin)號(hao)(hao)，最(zui)后(hou)(hou)在揚聲(sheng)(sheng)器(qi)系(xi)(xi)統(tong)(tong)中(zhong)(zhong)(zhong)播(bo)放出來(lai)。

解決這個問題(ti)的(de)(de)(de)首要(yao)方法是在(zai)系統(tong)設計時(shi)注意采(cai)用平衡連(lian)接(jie)(jie)，到(dao)(dao)功率(lv)放(fang)大器(qi)輸入(ru)(ru)端(duan)為止的(de)(de)(de)所(suo)有音(yin)(yin)(yin)頻(pin)(pin)(pin)(pin)(pin)線(xian)都應(ying)(ying)該采(cai)用屏蔽性(xing)能良好的(de)(de)(de)音(yin)(yin)(yin)頻(pin)(pin)(pin)(pin)(pin)電纜，并且連(lian)接(jie)(jie)線(xian)的(de)(de)(de)長度不(bu)要(yao)太長，接(jie)(jie)地(di)良好。在(zai)這些措施(shi)都到(dao)(dao)位的(de)(de)(de)情況下，還有干(gan)擾信(xin)(xin)號(hao)出現時(shi)，則應(ying)(ying)該考慮加(jia)入(ru)(ru)射(she)(she)頻(pin)(pin)(pin)(pin)(pin)濾(lv)波(bo)(bo)(bo)(bo)器(qi)，目前(qian)很(hen)多(duo)周邊設備的(de)(de)(de)信(xin)(xin)號(hao)輸入(ru)(ru)端(duan)加(jia)有射(she)(she)頻(pin)(pin)(pin)(pin)(pin)濾(lv)波(bo)(bo)(bo)(bo)器(qi)電路，能對射(she)(she)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)進行抑制，但是調(diao)音(yin)(yin)(yin)臺等設備的(de)(de)(de)輸入(ru)(ru)端(duan)沒有設置射(she)(she)頻(pin)(pin)(pin)(pin)(pin)濾(lv)波(bo)(bo)(bo)(bo)器(qi)電路。考慮到(dao)(dao)廣(guang)播調(diao)頻(pin)(pin)(pin)(pin)(pin)中波(bo)(bo)(bo)(bo)的(de)(de)(de)最低(di)(di)載波(bo)(bo)(bo)(bo)頻(pin)(pin)(pin)(pin)(pin)率(lv)是535kHz，所(suo)以(yi)(yi)建(jian)議射(she)(she)頻(pin)(pin)(pin)(pin)(pin)低(di)(di)通濾(lv)波(bo)(bo)(bo)(bo)器(qi)的(de)(de)(de)-3dB頻(pin)(pin)(pin)(pin)(pin)率(lv)選在(zai)400kHz，這樣比音(yin)(yin)(yin)頻(pin)(pin)(pin)(pin)(pin)最高(gao)頻(pin)(pin)(pin)(pin)(pin)率(lv)20kHz高(gao)了(le)20倍，不(bu)至于影響(xiang)音(yin)(yin)(yin)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)的(de)(de)(de)傳輸，當然比40kHz頻(pin)(pin)(pin)(pin)(pin)率(lv)再(zai)低(di)(di)一些也不(bu)是不(bu)可(ke)(ke)以(yi)(yi)，但是起(qi)碼(ma)要(yao)在(zai)200kHz以(yi)(yi)上(shang)。可(ke)(ke)以(yi)(yi)用RC構成(cheng)(cheng)阻(zu)容低(di)(di)通濾(lv)波(bo)(bo)(bo)(bo)器(qi)，也可(ke)(ke)以(yi)(yi)用LC構成(cheng)(cheng)濾(lv)波(bo)(bo)(bo)(bo)器(qi)，將低(di)(di)通濾(lv)波(bo)(bo)(bo)(bo)器(qi)接(jie)(jie)在(zai)調(diao)音(yin)(yin)(yin)臺的(de)(de)(de)輸入(ru)(ru)端(duan)，尤(you)其是小信(xin)(xin)號(hao)音(yin)(yin)(yin)源與調(diao)音(yin)(yin)(yin)臺相連(lian)接(jie)(jie)的(de)(de)(de)輸入(ru)(ru)口。