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會議音響設備常見問題解決 視頻會議音響系統故障處理

本文章由注冊用戶 我是我的王 上傳提供 評論 發布 反饋 0
摘要:智能視頻會議的應用越來越廣泛,會議音響作為視頻會議系統的重要設備之一,在使用過程中也會出現故障。那么,會議音響系統故障怎么處理呢?下面,就來講下會議音響設備常見問題解決。

當會議系統音響設備故障時(shi),該如何是好?現(xian)在,小編(bian)就為大家(jia)簡單的介紹一(yi)下,會議系(xi)統(tong)音響設備在發生故障的時(shi)候,該如何去判斷和排除。

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、檢查(cha)(cha)所有設備(bei)是(shi)否都(dou)已(yi)開啟(qi),各設備(bei)的(de)音量控制鈕是(shi)否都(dou)已(yi)調到合(he)適位(wei)置,調音臺上(shang)各通道(dao)路徑開關(guan)是(shi)否已(yi)選通,檢查(cha)(cha)各連接(jie)線是(shi)否已(yi)連接(jie)正確、可靠。

2、如(ru)(ru)還無聲則(ze)(ze)需逐級檢(jian)(jian)查(cha)(cha)(cha),可(ke)以(yi)(yi)從后(hou)(hou)(hou)(hou)(hou)向(xiang)前逐級檢(jian)(jian)查(cha)(cha)(cha),也(ye)可(ke)從前向(xiang)后(hou)(hou)(hou)(hou)(hou)逐級檢(jian)(jian)查(cha)(cha)(cha)。從前向(xiang)后(hou)(hou)(hou)(hou)(hou)查(cha)(cha)(cha)時(shi)(shi),首(shou)先用(yong)(yong)(yong)監聽(ting)耳機檢(jian)(jian)查(cha)(cha)(cha)信號是(shi)否已(yi)進人調音(yin)臺,然(ran)后(hou)(hou)(hou)(hou)(hou)可(ke)以(yi)(yi)用(yong)(yong)(yong)電(dian)壓表(biao)、萬用(yong)(yong)(yong)表(biao)逐級檢(jian)(jian)查(cha)(cha)(cha),直(zhi)至查(cha)(cha)(cha)出(chu)無聲的(de)(de)一(yi)級并判斷是(shi)設(she)備(bei)(bei)無輸出(chu),還是(shi)連線(xian)有(you)(you)問題(ti)。如(ru)(ru)確屬設(she)備(bei)(bei)故障(zhang),則(ze)(ze)應更換(huan)備(bei)(bei)用(yong)(yong)(yong)設(she)備(bei)(bei)以(yi)(yi)救急(ji);如(ru)(ru)果屬于周邊設(she)備(bei)(bei)出(chu)現(xian)故障(zhang),在沒有(you)(you)備(bei)(bei)用(yong)(yong)(yong)設(she)備(bei)(bei)的(de)(de)情況下,可(ke)以(yi)(yi)直(zhi)接將出(chu)故障(zhang)的(de)(de)周邊設(she)備(bei)(bei)跳過。例如(ru)(ru)均衡器出(chu)現(xian)故障(zhang)了,則(ze)(ze)可(ke)以(yi)(yi)將輸人到(dao)(dao)均衡器的(de)(de)輸人線(xian)插頭(tou)拔出(chu)來加(jia)(jia)到(dao)(dao)后(hou)(hou)(hou)(hou)(hou)一(yi)級設(she)備(bei)(bei)的(de)(de)輸人插座;如(ru)(ru)果是(shi)調音(yin)臺的(de)(de)某一(yi)輸人通(tong)道出(chu)現(xian)故障(zhang),則(ze)(ze)可(ke)以(yi)(yi)換(huan)一(yi)路輸人通(tong)道.直(zhi)到(dao)(dao)活(huo)動結束后(hou)(hou)(hou)(hou)(hou)再(zai)更換(huan)設(she)備(bei)(bei);如(ru)(ru)屬連接線(xian)有(you)(you)問題(ti),則(ze)(ze)在急(ji)用(yong)(yong)(yong)時(shi)(shi)先換(huan)備(bei)(bei)用(yong)(yong)(yong)線(xian),然(ran)后(hou)(hou)(hou)(hou)(hou)有(you)(you)空時(shi)(shi)再(zai)修理(li)設(she)備(bei)(bei)和(he)連接線(xian)。對(dui)于設(she)備(bei)(bei),如(ru)(ru)自己不(bu)熟悉(xi)設(she)備(bei)(bei)內部結構、原理(li)時(shi)(shi)不(bu)要(yao)輕易動手修理(li),以(yi)(yi)免(mian)小故障(zhang)變成大(da)故障(zhang)當(dang)用(yong)(yong)(yong)電(dian)容麥克風(feng)時(shi)(shi),還應檢(jian)(jian)查(cha)(cha)(cha)幻像電(dian)源是(shi)否加(jia)(jia)上(shang)。

二、會議音響系統中哼聲大的判斷與排除

哼(heng)(heng)聲往往是(shi)由(you)于接(jie)(jie)地(di)(di)不(bu)(bu)(bu)良(liang)或不(bu)(bu)(bu)對(dui),系統(tong)的(de)設(she)備不(bu)(bu)(bu)在(zai)同(tong)一(yi)路(lu)電網(wang)上,地(di)(di)電位嚴重(zhong)相差引(yin)起的(de),而連(lian)接(jie)(jie)線的(de)屏(ping)蔽(bi)層脫(tuo)焊或屏(ping)蔽(bi)線接(jie)(jie)得不(bu)(bu)(bu)對(dui)而形成地(di)(di)電流回路(lu),也會引(yin)起哼(heng)(heng)聲大。所以(yi)應著重(zhong)檢(jian)查這些方面,必要(yao)(yao)時(shi)應加隔(ge)離(li)用(yong)音(yin)頻變(bian)壓(ya)器(qi),以(yi)便把前后級設(she)備間的(de)“地(di)(di)”斷開,而信號仍(reng)然暢(chang)通(tong)。尤(you)其(qi)是(shi)在(zai)兩(liang)(liang)(liang)個(ge)(ge)(ge)系統(tong)之(zhi)間相連(lian)接(jie)(jie)時(shi),往往會由(you)于兩(liang)(liang)(liang)個(ge)(ge)(ge)系統(tong)不(bu)(bu)(bu)用(yong)同(tong)一(yi)電源而引(yin)起兩(liang)(liang)(liang)個(ge)(ge)(ge)系統(tong)之(zhi)間的(de)地(di)(di)電位不(bu)(bu)(bu)同(tong),有時(shi)甚至非常嚴重(zhong),從而產生明顯的(de)哼(heng)(heng)聲。對(dui)這種原(yuan)因引(yin)起的(de)非常容易判(pan)斷,只要(yao)(yao)將兩(liang)(liang)(liang)個(ge)(ge)(ge)系統(tong)之(zhi)間的(de)連(lian)接(jie)(jie)信號線插頭從一(yi)個(ge)(ge)(ge)系統(tong)拔掉,哼(heng)(heng)聲馬上會消(xiao)失。如果確認(ren)哼(heng)(heng)聲是(shi)由(you)于兩(liang)(liang)(liang)個(ge)(ge)(ge)系統(tong)電源的(de)地(di)(di)電位不(bu)(bu)(bu)同(tong)引(yin)起的(de),則可以(yi)采取(qu)將兩(liang)(liang)(liang)個(ge)(ge)(ge)系統(tong)的(de)“地(di)(di)”隔(ge)離(li)的(de)方法,通(tong)常用(yong)加隔(ge)離(li)用(yong)音(yin)頻變(bian)壓(ya)器(qi)來(lai)達到目的(de)對(dui)隔(ge)離(li)用(yong)音(yin)頻變(bian)壓(ya)器(qi)的(de)技術要(yao)(yao)求是(shi):

①一、二次繞組用同樣(yang)規格的導線繞制,圈數比為1:1;

②輸(shu)人阻抗(kang)和輸(shu)出阻抗(kang)均為600Ω;

③諧波失真不(bu)大于10%;

④頻率響應在40Hz~16kHz范圍內優于士0.5dB;

⑤功率(lv)最(zui)好不小于100mW。

三、會議音響系統中削波失棄的判斷與排除

首先檢查各設(she)備(bei)(bei)(bei)上(shang)的(de)削(xue)波(bo)(bo)指示燈是(shi)否(fou)亮著,如(ru)(ru)并未發現削(xue)波(bo)(bo)指示燈連續亮,則可以選(xuan)擇(ze)系統靠中間的(de)一臺(tai)設(she)備(bei)(bei)(bei)把(ba)音(yin)(yin)量降低幾個dB.以判(pan)斷是(shi)該(gai)設(she)備(bei)(bei)(bei)的(de)前面已有削(xue)波(bo)(bo)失真,還是(shi)在該(gai)設(she)備(bei)(bei)(bei)后面才(cai)產生的(de)削(xue)波(bo)(bo)失真。如(ru)(ru)此經過幾次(ci)調節音(yin)(yin)量控制器,即可判(pan)斷削(xue)波(bo)(bo)來(lai)自哪一級。一般來(lai)說,確實(shi)是(shi)信號過強引起的(de)削(xue)波(bo)(bo),則應(ying)在前級設(she)備(bei)(bei)(bei)上(shang)就將音(yin)(yin)量電平降下來(lai),如(ru)(ru)屬設(she)備(bei)(bei)(bei)故(gu)障(如(ru)(ru)設(she)備(bei)(bei)(bei)內的(de)工作電源不正(zheng)常或負反(fan)饋通路(lu)開路(lu)等)則必(bi)須更(geng)換設(she)備(bei)(bei)(bei)。

四、會議音響系統中聲音小的判斷與排除

在(zai)對各臺設(she)備(bei)的操(cao)作都符合規范的情(qing)況下,聲(sheng)(sheng)音小往(wang)往(wang)是連接(jie)(jie)線問題(ti)居多。如連接(jie)(jie)線短路,插(cha)頭、插(cha)座(zuo)配(pei)合不(bu)好(hao),連線虛(xu)焊(han)等(deng),在(zai)判定連接(jie)(jie)線沒有問題(ti)后再懷疑(yi)設(she)備(bei),檢(jian)查是那一(yi)臺設(she)備(bei)有了故障,然后再更換設(she)備(bei)。如聲(sheng)(sheng)音小還伴隨聲(sheng)(sheng)場嚴重不(bu)均勻則應考慮揚(yang)聲(sheng)(sheng)器的相位是否接(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(deng)的(de)(de)(de)干(gan)擾聲(sheng)(sheng)(sheng),統(tong)稱為(wei)噪(zao)聲(sheng)(sheng)(sheng)。有時一套擴聲(sheng)(sheng)(sheng)系(xi)統(tong)安裝(zhuang)完(wan),調(diao)(diao)(diao)試時可(ke)能聽到(dao)(dao)(dao)音(yin)(yin)箱(xiang)中(zhong)發(fa)出間隙(xi)性(xing)(xing)(xing)雜音(yin)(yin),甚(shen)至出現(xian)廣播(bo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)臺的(de)(de)(de)播(bo)音(yin)(yin)聲(sheng)(sheng)(sheng),這(zhe)(zhe)些(xie)聲(sheng)(sheng)(sheng)音(yin)(yin)往往是(shi)由于(yu)空(kong)間有較強(qiang)的(de)(de)(de)(被調(diao)(diao)(diao)制(zhi)(zhi)的(de)(de)(de))高(gao)(gao)(gao)頻(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)波(bo)(bo),擴聲(sheng)(sheng)(sheng)系(xi)統(tong)接收(shou)到(dao)(dao)(dao)這(zhe)(zhe)些(xie)被調(diao)(diao)(diao)制(zhi)(zhi)的(de)(de)(de)高(gao)(gao)(gao)頻(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)場后(hou)產(chan)(chan)生(sheng)高(gao)(gao)(gao)頻(pin)感應電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動勢(shi)—高(gao)(gao)(gao)頻(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)號(hao),然(ran)(ran)后(hou)這(zhe)(zhe)個高(gao)(gao)(gao)頻(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)號(hao)通過(guo)(guo)擴聲(sheng)(sheng)(sheng)系(xi)統(tong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)子電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)中(zhong)的(de)(de)(de)例如(ru)晶體(ti)二極(ji)管(guan)、晶體(ti)三極(ji)管(guan)、場效應管(guan)、集成(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)等(deng)非(fei)(fei)線性(xing)(xing)(xing)元器件構(gou)成(cheng)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)對高(gao)(gao)(gao)頻(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)號(hao)進行(xing)解調(diao)(diao)(diao),將寄(ji)生(sheng)于(yu)高(gao)(gao)(gao)頻(pin)信(xin)(xin)號(hao)中(zhong)的(de)(de)(de)音(yin)(yin)頻(pin)調(diao)(diao)(diao)制(zhi)(zhi)信(xin)(xin)號(hao)解調(diao)(diao)(diao)出來,這(zhe)(zhe)里高(gao)(gao)(gao)頻(pin)信(xin)(xin)號(hao)相(xiang)當(dang)于(yu)被調(diao)(diao)(diao)制(zhi)(zhi)的(de)(de)(de)載(zai)波(bo)(bo)信(xin)(xin)號(hao),而(er)寄(ji)生(sheng)于(yu)這(zhe)(zhe)些(xie)高(gao)(gao)(gao)頻(pin)信(xin)(xin)號(hao)中(zhong)的(de)(de)(de)音(yin)(yin)頻(pin)信(xin)(xin)號(hao)相(xiang)當(dang)于(yu)調(diao)(diao)(diao)制(zhi)(zhi)波(bo)(bo)信(xin)(xin)號(hao),如(ru)果我們的(de)(de)(de)擴聲(sheng)(sheng)(sheng)系(xi)統(tong)設(she)計不是(shi)很到(dao)(dao)(dao)位(wei),則可(ke)能將射頻(pin)無(wu)線電(dian)(dian)(dian)(dian)(dian)(dian)(dian)高(gao)(gao)(gao)頻(pin)干(gan)擾信(xin)(xin)號(hao)通過(guo)(guo)連接線較多(duo)地(di)接收(shou)進來,然(ran)(ran)后(hou)由于(yu)擴聲(sheng)(sheng)(sheng)設(she)備電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)的(de)(de)(de)非(fei)(fei)線性(xing)(xing)(xing),將這(zhe)(zhe)些(xie)高(gao)(gao)(gao)頻(pin)無(wu)線電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)號(hao)進行(xing)解調(diao)(diao)(diao),從而(er)產(chan)(chan)生(sheng)可(ke)感覺(jue)到(dao)(dao)(dao)的(de)(de)(de)音(yin)(yin)頻(pin)干(gan)擾信(xin)(xin)號(hao),最后(hou)在揚聲(sheng)(sheng)(sheng)器系(xi)統(tong)中(zhong)播(bo)放出來。

解(jie)決(jue)這個問題的(de)(de)首(shou)要(yao)方法是(shi)(shi)(shi)在(zai)系統(tong)設(she)計時注意(yi)采(cai)用(yong)平衡連(lian)接,到功率(lv)放大器(qi)輸(shu)入(ru)(ru)端(duan)為(wei)止的(de)(de)所(suo)有(you)(you)音(yin)(yin)(yin)頻(pin)(pin)(pin)線都(dou)(dou)應該采(cai)用(yong)屏蔽性能(neng)(neng)良(liang)(liang)好(hao)的(de)(de)音(yin)(yin)(yin)頻(pin)(pin)(pin)電(dian)纜,并且連(lian)接線的(de)(de)長(chang)度不要(yao)太(tai)長(chang),接地良(liang)(liang)好(hao)。在(zai)這些措(cuo)施都(dou)(dou)到位的(de)(de)情況(kuang)下,還有(you)(you)干(gan)擾信(xin)(xin)號出現(xian)時,則(ze)應該考(kao)慮加(jia)入(ru)(ru)射頻(pin)(pin)(pin)濾波(bo)(bo)(bo)器(qi),目(mu)前很多周邊設(she)備的(de)(de)信(xin)(xin)號輸(shu)入(ru)(ru)端(duan)加(jia)有(you)(you)射頻(pin)(pin)(pin)濾波(bo)(bo)(bo)器(qi)電(dian)路,能(neng)(neng)對射頻(pin)(pin)(pin)信(xin)(xin)號進行抑制,但是(shi)(shi)(shi)調(diao)音(yin)(yin)(yin)臺等設(she)備的(de)(de)輸(shu)入(ru)(ru)端(duan)沒有(you)(you)設(she)置射頻(pin)(pin)(pin)濾波(bo)(bo)(bo)器(qi)電(dian)路。考(kao)慮到廣播(bo)調(diao)頻(pin)(pin)(pin)中波(bo)(bo)(bo)的(de)(de)最(zui)低(di)載波(bo)(bo)(bo)頻(pin)(pin)(pin)率(lv)是(shi)(shi)(shi)535kHz,所(suo)以(yi)建議射頻(pin)(pin)(pin)低(di)通濾波(bo)(bo)(bo)器(qi)的(de)(de)-3dB頻(pin)(pin)(pin)率(lv)選在(zai)400kHz,這樣比音(yin)(yin)(yin)頻(pin)(pin)(pin)最(zui)高(gao)頻(pin)(pin)(pin)率(lv)20kHz高(gao)了20倍(bei),不至于影(ying)響音(yin)(yin)(yin)頻(pin)(pin)(pin)信(xin)(xin)號的(de)(de)傳輸(shu),當(dang)然比40kHz頻(pin)(pin)(pin)率(lv)再(zai)低(di)一些也不是(shi)(shi)(shi)不可以(yi),但是(shi)(shi)(shi)起(qi)碼(ma)要(yao)在(zai)200kHz以(yi)上。可以(yi)用(yong)RC構成(cheng)阻容低(di)通濾波(bo)(bo)(bo)器(qi),也可以(yi)用(yong)LC構成(cheng)濾波(bo)(bo)(bo)器(qi),將(jiang)低(di)通濾波(bo)(bo)(bo)器(qi)接在(zai)調(diao)音(yin)(yin)(yin)臺的(de)(de)輸(shu)入(ru)(ru)端(duan),尤其是(shi)(shi)(shi)小信(xin)(xin)號音(yin)(yin)(yin)源(yuan)與(yu)調(diao)音(yin)(yin)(yin)臺相連(lian)接的(de)(de)輸(shu)入(ru)(ru)口(kou)。

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