電(dian)(dian)(dian)話(hua)(hua)[英語:Telephone,出(chu)自(zi)希臘語τ?λε(tēle,意(yi)為(wei)“遠(yuan)(yuan)”)和φων?(phōnē,意(yi)為(wei)“聲(sheng)音”),舊譯德律(lv)風(feng)]是(shi)一(yi)種可以(yi)傳送與接收聲(sheng)音的(de)(de)(de)遠(yuan)(yuan)程通(tong)信設備。早(zao)在18世紀歐(ou)洲已有(you)“電(dian)(dian)(dian)話(hua)(hua)”一(yi)詞,用(yong)來指用(yong)線串成的(de)(de)(de)話(hua)(hua)筒(以(yi)線串起杯子)。電(dian)(dian)(dian)話(hua)(hua)的(de)(de)(de)出(chu)現(xian)要歸功于亞歷(li)山大·格拉漢(han)姆(mu)·貝(bei)爾(er),早(zao)期電(dian)(dian)(dian)話(hua)(hua)機的(de)(de)(de)原理為(wei):說(shuo)話(hua)(hua)聲(sheng)音為(wei)空(kong)氣里的(de)(de)(de)復(fu)合振(zhen)動,可傳輸到固體上,通(tong)過電(dian)(dian)(dian)脈沖(chong)于導電(dian)(dian)(dian)金屬上傳遞。貝(bei)爾(er)于1876年3月申(shen)請了電(dian)(dian)(dian)話(hua)(hua)的(de)(de)(de)專利(li)權。
美國國會2002年(nian)6月(yue)15日(ri)269號決議確認安東(dong)尼奧·穆齊為電(dian)話的(de)(de)發(fa)明(ming)人。穆齊于(yu)1860年(nian)首次向(xiang)公眾(zhong)展示了他的(de)(de)發(fa)明(ming),并在紐(niu)約的(de)(de)意大利語報紙上發(fa)表了關于(yu)這項發(fa)明(ming)的(de)(de)介紹。
歷史上對電(dian)話(hua)(hua)(hua)的改進(jin)和(he)發明包括:碳(tan)粉話(hua)(hua)(hua)筒、人工交(jiao)(jiao)換板、撥(bo)(bo)號盤、自(zi)動電(dian)話(hua)(hua)(hua)交(jiao)(jiao)換機(ji)、程控電(dian)話(hua)(hua)(hua)交(jiao)(jiao)換機(ji)、雙音多(duo)頻撥(bo)(bo)號、語音數字(zi)采樣等。近年來(lai)的新技術包括:ISDN、DSL、網絡電(dian)話(hua)(hua)(hua)、模擬移動電(dian)話(hua)(hua)(hua)和(he)數字(zi)移動電(dian)話(hua)(hua)(hua)等。
這一(yi)(yi)(yi)行(xing)業通常(chang)分(fen)為電(dian)(dian)話設備制(zhi)造商(shang)和(he)電(dian)(dian)話網絡運(yun)營商(shang)。在(zai)歷史上,網絡運(yun)營商(shang)通常(chang)都擁有(you)全(quan)國性(xing)的(de)壟(long)斷。近年(nian)來(lai),隨著全(quan)球電(dian)(dian)信市場的(de)開放(fang)和(he)集(ji)成(cheng)以及(ji)技術的(de)發(fa)展(zhan),逐漸(jian)出現多(duo)家運(yun)營商(shang)在(zai)同一(yi)(yi)(yi)市場競爭的(de)局面。例(li)如(ru),貝爾(er)系統,即AT&T的(de)下屬(shu)公司曾擁有(you)美國電(dian)(dian)話市場的(de)80%。1984年(nian),由于美國司法(fa)部反壟(long)斷訴訟(song),貝爾(er)系統被迫分(fen)區(qu)成(cheng)多(duo)個獨立的(de)地方貝爾(er)公司。有(you)一(yi)(yi)(yi)個說(shuo)(shuo)法(fa)可以說(shuo)(shuo)明(ming)這個現象:在(zai)AT&T未分(fen)區(qu)前,IBM是美國第(di)二大公司。在(zai)AT&T分(fen)區(qu)成(cheng)七個公司后(hou),IBM的(de)排名變成(cheng)第(di)八名。
電話(hua)(hua)機(ji)是通過電信(xin)號雙(shuang)向傳輸話(hua)(hua)音的終端設(she)備。
歷史上對(dui)電(dian)(dian)話(hua)機(ji)的改進和發明包(bao)括(kuo):碳粉話(hua)筒(tong)、電(dian)(dian)話(hua)人工交換板、撥(bo)號盤、自動電(dian)(dian)話(hua)交換機(ji)、程(cheng)控(kong)電(dian)(dian)話(hua)交換機(ji)、雙音(yin)多頻撥(bo)號、語音(yin)數(shu)字(zi)采(cai)樣(yang)等(deng)。新技術包(bao)括(kuo):ISDN、DSL、模擬移動電(dian)(dian)話(hua)和數(shu)字(zi)移動電(dian)(dian)話(hua)機(ji)等(deng)。
電話電源線(xian)、電話線(xian)、收線(xian)開(kai)關、受話器、增音(yin)按(an)(an)鈕、送話器、本機號碼片、鈴聲(sheng)及免提喇(la)叭(ba)、記憶(yi)代(dai)碼鍵(jian)(jian)、記憶(yi)號碼片、數字按(an)(an)鍵(jian)(jian)、記憶(yi)取出鍵(jian)(jian)、記憶(yi)儲存鍵(jian)(jian)、重(zhong)撥鍵(jian)(jian)、工作指示燈、免提鍵(jian)(jian)、R鍵(jian)(jian)、免提送話器、鈴聲(sheng)調節開(kai)關、P/T開(kai)關、免提接收音(yin)量(liang)調節旋(xuan)鈕。
電(dian)(dian)話通(tong)信是通(tong)過聲能與(yu)電(dian)(dian)能相互轉(zhuan)換、并利用“電(dian)(dian)”這個(ge)媒介來傳輸語(yu)言的一(yi)種通(tong)信技術。兩個(ge)用戶要進行(xing)通(tong)信,最簡單的形式就是將兩部(bu)電(dian)(dian)話機用一(yi)對線(xian)路連接起來。
當發話者拿起電話機(ji)對著送話器(qi)講話時(shi),聲帶的振動(dong)(dong)激勵空氣振動(dong)(dong),形成聲波。
聲(sheng)波作用于送話(hua)(hua)器上,使之(zhi)產生電(dian)流,稱(cheng)為話(hua)(hua)音電(dian)流。
話音電流沿(yan)著線(xian)路傳送(song)到對(dui)方(fang)電話機的受話器內。
而受話(hua)器(qi)作用(yong)與送話(hua)器(qi)剛好相反——把電流轉化為聲波(bo),通過空氣傳至人的(de)耳朵中。
這樣,就完成了(le)最簡單的通話過程。
電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)是美國人A.G.貝爾于(yu)1876年(nian)發(fa)明的(de)(de)。他用(yong)兩根導線(xian)連接兩個結構(gou)完全(quan)相同、在電(dian)(dian)(dian)(dian)磁(ci)鐵上裝有(you)振(zhen)動膜片的(de)(de)送(song)話(hua)(hua)(hua)器和(he)受話(hua)(hua)(hua)器,首先實現(xian)兩端通(tong)(tong)(tong)話(hua)(hua)(hua)。但通(tong)(tong)(tong)話(hua)(hua)(hua)距離短、效率(lv)低。1878年(nian)出現(xian)了炭精送(song)話(hua)(hua)(hua)器,使電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)送(song)話(hua)(hua)(hua)器效率(lv)大大提高。受話(hua)(hua)(hua)器結構(gou)也(ye)(ye)有(you)改進(jin)。最早的(de)(de)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)是磁(ci)石電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji),靠自(zi)備(bei)電(dian)(dian)(dian)(dian)池供電(dian)(dian)(dian)(dian),用(yong)手(shou)搖發(fa)電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)(ji)發(fa)送(song)呼叫信(xin)號。1880年(nian)出現(xian)共電(dian)(dian)(dian)(dian)式(shi)(shi)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji),改由(you)共電(dian)(dian)(dian)(dian)交換(huan)機(ji)(ji)(ji)(ji)(ji)集中供電(dian)(dian)(dian)(dian),省去手(shou)播發(fa)電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)(ji)和(he)干電(dian)(dian)(dian)(dian)池。1891年(nian)出現(xian)了旋轉撥(bo)號盤式(shi)(shi)自(zi)動電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji),它可(ke)以發(fa)出直(zhi)流撥(bo)號脈沖,控制(zhi)自(zi)動交換(huan)機(ji)(ji)(ji)(ji)(ji)動作(zuo),選擇被叫用(yong)戶,自(zi)動完成交換(huan)功能。從而(er)把電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)通(tong)(tong)(tong)信(xin)推向(xiang)(xiang)一個新(xin)階段。到20世紀(ji)(ji)60年(nian)代(dai)末期出現(xian)了按鍵(jian)式(shi)(shi)全(quan)電(dian)(dian)(dian)(dian)子(zi)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)。除脈沖發(fa)號方式(shi)(shi)外(wai),又出現(xian)了雙音(yin)(yin)多頻(pin)(pin)(DTMF)發(fa)號方式(shi)(shi)。隨(sui)著程控交換(huan)機(ji)(ji)(ji)(ji)(ji)的(de)(de)發(fa)展,雙音(yin)(yin)頻(pin)(pin)按鍵(jian)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)已逐(zhu)步(bu)普及。電(dian)(dian)(dian)(dian)子(zi)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)電(dian)(dian)(dian)(dian)路正在向(xiang)(xiang)集成化邁進(jin),話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)專用(yong)集成電(dian)(dian)(dian)(dian)路已廣泛用(yong)于(yu)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)電(dian)(dian)(dian)(dian)路各組成部分。各種多功能電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)和(he)特種用(yong)途電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)也(ye)(ye)應(ying)運而(er)生。到20世紀(ji)(ji)90年(nian)代(dai)初,已有(you)了將撥(bo)號、通(tong)(tong)(tong)話(hua)(hua)(hua)、振(zhen)鈴三種功能集于(yu)一塊集成電(dian)(dian)(dian)(dian)路上的(de)(de)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)。隨(sui)著話(hua)(hua)(hua)音(yin)(yin)識(shi)別技(ji)術的(de)(de)發(fa)展,直(zhi)接用(yong)話(hua)(hua)(hua)音(yin)(yin)“撥(bo)號”的(de)(de)新(xin)型電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)也(ye)(ye)正在出現(xian)。
最初的(de)電(dian)(dian)話(hua)機(終(zhong)端)是(shi)由微型(xing)發(fa)電(dian)(dian)機和電(dian)(dian)池構成的(de)磁石式電(dian)(dian)話(hua)機,打電(dian)(dian)話(hua)時(shi),使用者用手(shou)搖(yao)微型(xing)發(fa)電(dian)(dian)機發(fa)出電(dian)(dian)信(xin)號(hao)呼叫(jiao)對方(fang),對方(fang)啟機后(hou)(hou)構成通話(hua)回路。后(hou)(hou)來,1877年愛迪生(sheng)(T.E.Edison)發(fa)明了(le)碳素(su)送話(hua)器和誘(you)導線路后(hou)(hou)通話(hua)距離延(yan)長(chang)了(le)。同一年又發(fa)明了(le)共電(dian)(dian)式電(dian)(dian)話(hua)機。1891年終(zhong)于(yu)發(fa)展到A.B.Strowger發(fa)明了(le)自動式電(dian)(dian)話(hua)機。
電(dian)話(hua)(hua)機設置(zhi)在電(dian)話(hua)(hua)通信起點和終(zhong)點的(de)(de)(de)用戶側,是(shi)電(dian)話(hua)(hua)網的(de)(de)(de)用戶終(zhong)端(duan)設備(bei)。現代(dai)的(de)(de)(de)電(dian)話(hua)(hua)機能夠(gou)方便地實現終(zhong)端(duan)用戶之間(jian)的(de)(de)(de)呼叫和通話(hua)(hua),是(shi)經過一(yi)(yi)百多年來許多人的(de)(de)(de)研究和無數次的(de)(de)(de)改進而形(xing)成的(de)(de)(de)。盡管它們的(de)(de)(de)式樣千差萬別,但一(yi)(yi)般都(dou)有如下基(ji)本功能:
1、聲電互換
因為(wei)要進行快速的、遠(yuan)距離的通(tong)信(xin),不能直(zhi)接傳送聲(sheng)音(yin),而必(bi)須先(xian)把聲(sheng)音(yin)變成(cheng)電信(xin)號(即以電作為(wei)載體),到對方(fang)后(hou)再(zai)把電信(xin)號還原成(cheng)為(wei)聲(sheng)音(yin)。
2、摘機識別
當(dang)主叫方拿起電話機(ji)時,交換機(ji)應有(you)(you)能(neng)知道(dao)“有(you)(you)人要打電話”的功能(neng),以便(bian)交換機(ji)做好接(jie)續準備。
3、發送信號
自動電話機(ji)(ji)正是通過發(fa)送撥號信號來指揮電話交換機(ji)(ji)的工作,并進而建(jian)立兩個電話機(ji)(ji)之間的連接的。
4、響鈴
即在(zai)對方來電話(hua)時,電話(hua)機能以鈴聲(sheng)告訴主人:“有人來電話(hua)了。”
5、電接續
電(dian)話(hua)機中,實現(xian)這(zhe)五大功能的部件依(yi)次是(shi):送(song)受(shou)話(hua)器、叉(cha)簧、撥號盤(pan)(pan)(或按鍵盤(pan)(pan))、電(dian)話(hua)鈴和電(dian)話(hua)回路。
電(dian)(dian)(dian)話(hua)機(ji)具(ju)有將終端的(de)(de)音波轉換為(wei)電(dian)(dian)(dian)子(zi)信號,通過電(dian)(dian)(dian)話(hua)線(xian)傳送(song)到遠(yuan)距(ju)離的(de)(de)對方(fang)(fang)(fang),同時將對方(fang)(fang)(fang)傳送(song)來的(de)(de)電(dian)(dian)(dian)子(zi)信號再(zai)生(sheng)(sheng)為(wei)語(yu)(yu)音(音波),使其通話(hua)的(de)(de)功(gong)能,以及發(fa)(fa)送(song)可從多個(ge)對方(fang)(fang)(fang)中選(xuan)擇的(de)(de)信號(撥號脈沖(chong)),告知對方(fang)(fang)(fang)的(de)(de)呼(hu)叫音等功(gong)能。電(dian)(dian)(dian)話(hua)機(ji)由(you)將語(yu)(yu)音轉換為(wei)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)發(fa)(fa)送(song)到電(dian)(dian)(dian)話(hua)線(xian)的(de)(de)送(song)話(hua)機(ji)、將對方(fang)(fang)(fang)傳送(song)來的(de)(de)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)還原為(wei)語(yu)(yu)音的(de)(de)受話(hua)機(ji)、呼(hu)叫對方(fang)(fang)(fang)的(de)(de)撥號或(huo)按鈕(niu)、發(fa)(fa)送(song)呼(hu)叫音的(de)(de)鈴聲、將這(zhe)些(xie)連接在電(dian)(dian)(dian)話(hua)線(xian)上執行其功(gong)能的(de)(de)線(xian)路網等組成。送(song)話(hua)機(ji)內有裝滿碳(tan)素(su)顆(ke)粒(li)的(de)(de)小(xiao)箱子(zi),其前方(fang)(fang)(fang)有薄(bo)硬鋁合金(jin)振動(dong)板(ban)。振動(dong)板(ban)根據語(yu)(yu)音振動(dong),振動(dong)碳(tan)素(su)顆(ke)粒(li),碳(tan)素(su)顆(ke)粒(li)傳導電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu),隨著顆(ke)粒(li)的(de)(de)接觸程度,電(dian)(dian)(dian)阻(zu)發(fa)(fa)生(sheng)(sheng)變化,生(sheng)(sheng)成語(yu)(yu)音電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)。受話(hua)機(ji)接受對方(fang)(fang)(fang)的(de)(de)語(yu)(yu)音電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)后,在線(xian)圈上生(sheng)(sheng)成語(yu)(yu)音電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)引起的(de)(de)磁力(li),振動(dong)鐵振動(dong)板(ban),發(fa)(fa)出聲音。
無(wu)線(xian)環(huan)路-無(wu)繩電話
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數字無繩電話
模擬無繩電話
移動電話手機
小(xiao)靈通(無(wu)線電話(hua))
隨著IT技術的(de)不斷的(de)飛速(su)發展,嵌入式終端設備的(de)處理(li)能力越(yue)來越(yue)強,21世紀初出現了一(yi)種帶個人(ren)數據助理(li)(PDA)的(de)電話機(ji)“智能電話”。
智(zhi)能(neng)(neng)(neng)(neng)(neng)電(dian)(dian)(dian)話(hua)除(chu)了有(you)完整的(de)固定電(dian)(dian)(dian)話(hua)功(gong)(gong)能(neng)(neng)(neng)(neng)(neng)外,通常還具有(you)大容量的(de)名(ming)(ming)片管理(li)功(gong)(gong)能(neng)(neng)(neng)(neng)(neng)、來去電(dian)(dian)(dian)管理(li)功(gong)(gong)能(neng)(neng)(neng)(neng)(neng)、防(fang)止(zhi)電(dian)(dian)(dian)話(hua)騷(sao)擾(rao)(電(dian)(dian)(dian)話(hua)防(fang)火墻)功(gong)(gong)能(neng)(neng)(neng)(neng)(neng)、企業集團電(dian)(dian)(dian)話(hua)名(ming)(ming)片(內部名(ming)(ming)片)管理(li)功(gong)(gong)能(neng)(neng)(neng)(neng)(neng),以(yi)及輔(fu)助辦公的(de)許多功(gong)(gong)能(neng)(neng)(neng)(neng)(neng),比如:日程安排、便箋、日歷、計算器等功(gong)(gong)能(neng)(neng)(neng)(neng)(neng)。早期的(de)智(zhi)能(neng)(neng)(neng)(neng)(neng)電(dian)(dian)(dian)話(hua)通過撥號上(shang)網,具有(you)一定的(de)信(xin)息交換能(neng)(neng)(neng)(neng)(neng)力,實(shi)現了發送短信(xin)、接(jie)收文字信(xin)息的(de)功(gong)(gong)能(neng)(neng)(neng)(neng)(neng)。隨(sui)著固網智(zhi)能(neng)(neng)(neng)(neng)(neng)電(dian)(dian)(dian)話(hua)在中國近十年(nian)的(de)發展,其處理(li)能(neng)(neng)(neng)(neng)(neng)力加(jia)強(qiang),逐漸地增加(jia)了智(zhi)能(neng)(neng)(neng)(neng)(neng)手機(Smartphone)具有(you)的(de)功(gong)(gong)能(neng)(neng)(neng)(neng)(neng)。
智能(neng)電(dian)話(hua)已有(you)通過因特網(wang)(wang)上(shang)(shang)網(wang)(wang)的(de)(de)能(neng)力及較強的(de)(de)多(duo)媒的(de)(de)體功(gong)(gong)能(neng)。可以進(jin)行網(wang)(wang)絡瀏覽、音(yin)視頻(pin)的(de)(de)播放、具有(you)電(dian)子書、電(dian)子相框等功(gong)(gong)能(neng)。同時智能(neng)電(dian)話(hua)在輔助辦(ban)公(gong)、輔助營銷、娛樂等方面的(de)(de)功(gong)(gong)能(neng)也有(you)了大大的(de)(de)加強。在對傳統固定電(dian)話(hua)顛覆的(de)(de)基礎上(shang)(shang),實現了更多(duo)的(de)(de)商務(wu)功(gong)(gong)能(neng)和PDA功(gong)(gong)能(neng)。
環境溫度:-10℃~40℃
相對濕度:45%~95%
大氣壓力:860~1060mbar
環境噪聲:≤60dB(A)
1、工作(zuo)頻(pin)率:300~3400HZ
2、脈沖通(tong)斷比:1.6±0.2∶1
3、雙音頻(pin)撥號(hao)頻(pin)偏:≤±1.5%
4、雙(shuang)音頻信號電平:①低頻群:-9±3dB;②高頻群:-7±3dB;③頻率組合(he)中高頻分量(liang)比低頻分量(liang)高2±1dB
5、振鈴聲級:≥70dB(A)
6、電聲性能:
①在(zai)(zai)0公里時,客觀發(fa)送參(can)考當量≥+3;在(zai)(zai)3公里時,客觀發(fa)送參(can)考當量≤+15;在(zai)(zai)5公里時,客觀發(fa)送參(can)考當量≤+15。
②在(zai)0公(gong)里(li)時,客觀接收(shou)參考(kao)(kao)當量≥-5;在(zai)3公(gong)里(li)時,客觀接收(shou)參考(kao)(kao)當量≤+2;在(zai)5公(gong)里(li)時,客觀接收(shou)摻考(kao)(kao)當量≤+2。
③在0公(gong)里(li)時(shi),客觀側(ce)音參(can)(can)考(kao)當(dang)量≥+3;在3公(gong)里(li)時(shi),客觀側(ce)音參(can)(can)考(kao)當(dang)量≥+10;在5公(gong)里(li)時(shi),客觀側(ce)音參(can)(can)考(kao)當(dang)量≥+10。
高科(ke)技電(dian)話機(ji)的(de)(de)(de)(de)(de)(de)發(fa)展(zhan)(zhan)都(dou)(dou)是隨著無線(xian)通(tong)信的(de)(de)(de)(de)(de)(de)發(fa)達而形成的(de)(de)(de)(de)(de)(de)。電(dian)話機(ji)的(de)(de)(de)(de)(de)(de)發(fa)展(zhan)(zhan)趨(qu)勢經(jing)過Digital電(dian)話機(ji)和PCS后發(fa)展(zhan)(zhan)到可以用衛星通(tong)信的(de)(de)(de)(de)(de)(de)IMT-200服務。IMT-200支(zhi)持信息的(de)(de)(de)(de)(de)(de)高速傳送,Packet,畫像等多媒(mei)體的(de)(de)(de)(de)(de)(de)服務,將來(lai)世(shi)界各個地方都(dou)(dou)可以使(shi)用所有(you)聲(sheng)音電(dian)話,電(dian)報用戶直通(tong)電(dian)路,傳呼和電(dian)子郵件(jian);隨著電(dian)子郵件(jian)的(de)(de)(de)(de)(de)(de)普及,網絡也日益化,網絡電(dian)話已(yi)是不(bu)可阻(zu)擋的(de)(de)(de)(de)(de)(de)發(fa)展(zhan)(zhan)趨(qu)勢。現有(you)的(de)(de)(de)(de)(de)(de)固定電(dian)話,已(yi)經(jing)不(bu)能(neng)提供(gong)人們的(de)(de)(de)(de)(de)(de)需要了。未(wei)來(lai)的(de)(de)(de)(de)(de)(de)固定電(dian)話講裝備攝像頭,帶有(you)色彩的(de)(de)(de)(de)(de)(de)液晶(jing)顯示(shi)器,我(wo)們在(zai)接固定電(dian)話的(de)(de)(de)(de)(de)(de)時候(hou),都(dou)(dou)能(neng)夠看到雙方。