電話(hua)[英語(yu)：Telephone，出(chu)自(zi)希臘語(yu)τ?λε（tēle，意(yi)為(wei)(wei)“遠”）和φων?（phōnē，意(yi)為(wei)(wei)“聲音”），舊譯德(de)律風]是(shi)一種(zhong)可以(yi)(yi)傳送與接(jie)收聲音的(de)(de)遠程通信(xin)設(she)備(bei)。早在18世紀歐洲已有“電話(hua)”一詞，用(yong)來(lai)指用(yong)線串成(cheng)的(de)(de)話(hua)筒（以(yi)(yi)線串起(qi)杯子）。電話(hua)的(de)(de)出(chu)現要歸功于亞(ya)歷山大·格拉漢姆(mu)·貝(bei)(bei)爾，早期電話(hua)機的(de)(de)原(yuan)理為(wei)(wei)：說話(hua)聲音為(wei)(wei)空氣里的(de)(de)復合振動，可傳輸到(dao)固(gu)體(ti)上(shang)，通過電脈沖于導電金屬上(shang)傳遞(di)。貝(bei)(bei)爾于1876年(nian)3月申請了(le)電話(hua)的(de)(de)專利(li)權。
美(mei)國(guo)國(guo)會2002年6月(yue)15日(ri)269號決議確認安東尼奧·穆齊為電話的(de)(de)發(fa)明(ming)人。穆齊于1860年首(shou)次(ci)向(xiang)公眾展示了他(ta)的(de)(de)發(fa)明(ming)，并在紐約的(de)(de)意(yi)大(da)利語(yu)報紙上發(fa)表了關于這項發(fa)明(ming)的(de)(de)介紹。
歷(li)史上對(dui)電(dian)話(hua)的(de)改進(jin)和發(fa)明包括：碳(tan)粉話(hua)筒(tong)、人工交換板、撥號(hao)盤、自動電(dian)話(hua)交換機、程控電(dian)話(hua)交換機、雙音多(duo)頻(pin)撥號(hao)、語(yu)音數字采樣(yang)等。近(jin)年來(lai)的(de)新技(ji)術包括：ISDN、DSL、網絡電(dian)話(hua)、模擬(ni)移(yi)動電(dian)話(hua)和數字移(yi)動電(dian)話(hua)等。
這一(yi)行業通常分為(wei)電話(hua)設備制造商(shang)和(he)電話(hua)網絡運營(ying)商(shang)。在歷(li)史上，網絡運營(ying)商(shang)通常都擁有(you)全國性的(de)壟斷。近年來，隨著全球(qiu)電信市場(chang)的(de)開放和(he)集成(cheng)(cheng)以及技術(shu)的(de)發展(zhan)，逐(zhu)漸出現多家運營(ying)商(shang)在同(tong)一(yi)市場(chang)競爭的(de)局面。例如，貝(bei)爾系統，即(ji)AT&T的(de)下屬公司(si)曾擁有(you)美國電話(hua)市場(chang)的(de)80%。1984年，由于美國司(si)法部(bu)反(fan)壟斷訴訟(song)，貝(bei)爾系統被迫分區成(cheng)(cheng)多個(ge)(ge)獨立的(de)地方貝(bei)爾公司(si)。有(you)一(yi)個(ge)(ge)說法可以說明(ming)這個(ge)(ge)現象：在AT&T未(wei)分區前，IBM是美國第(di)二大公司(si)。在AT&T分區成(cheng)(cheng)七個(ge)(ge)公司(si)后，IBM的(de)排名變成(cheng)(cheng)第(di)八名。
電話(hua)機是通過(guo)電信號雙向傳輸(shu)話(hua)音(yin)的終(zhong)端設備。
歷史上(shang)對電話(hua)(hua)機(ji)的改進和發(fa)明包括：碳粉(fen)話(hua)(hua)筒(tong)、電話(hua)(hua)人工交換(huan)板、撥號(hao)盤、自動電話(hua)(hua)交換(huan)機(ji)、程控(kong)電話(hua)(hua)交換(huan)機(ji)、雙(shuang)音多頻撥號(hao)、語音數(shu)字(zi)采樣等(deng)。新技術包括：ISDN、DSL、模擬(ni)移動電話(hua)(hua)和數(shu)字(zi)移動電話(hua)(hua)機(ji)等(deng)。
電(dian)話電(dian)源線(xian)、電(dian)話線(xian)、收線(xian)開關、受話器、增音(yin)按鈕(niu)、送(song)(song)話器、本機號(hao)碼片(pian)、鈴(ling)聲及免(mian)(mian)提喇叭、記(ji)憶(yi)代碼鍵、記(ji)憶(yi)號(hao)碼片(pian)、數字(zi)按鍵、記(ji)憶(yi)取出鍵、記(ji)憶(yi)儲(chu)存鍵、重撥(bo)鍵、工作指示燈(deng)、免(mian)(mian)提鍵、R鍵、免(mian)(mian)提送(song)(song)話器、鈴(ling)聲調節開關、P/T開關、免(mian)(mian)提接收音(yin)量調節旋鈕(niu)。
電話通(tong)信(xin)是通(tong)過聲能與(yu)電能相互轉換、并利用(yong)“電”這個媒介來(lai)傳輸語言的一種(zhong)通(tong)信(xin)技術。兩(liang)個用(yong)戶要進行通(tong)信(xin)，最簡(jian)單(dan)的形式就是將兩(liang)部電話機用(yong)一對(dui)線路連(lian)接起(qi)來(lai)。
當(dang)發話(hua)者拿起(qi)電(dian)話(hua)機(ji)對著送話(hua)器講話(hua)時，聲(sheng)帶的振(zhen)動(dong)激勵空氣振(zhen)動(dong)，形(xing)成聲(sheng)波。
聲波作(zuo)用(yong)于送話(hua)(hua)器上，使之產生電流(liu)，稱為話(hua)(hua)音電流(liu)。
話(hua)音電流沿著線(xian)路(lu)傳送到對(dui)方電話(hua)機的受(shou)話(hua)器(qi)內。
而受(shou)話(hua)器(qi)作用與送話(hua)器(qi)剛(gang)好相反——把(ba)電(dian)流轉化為聲波，通過空氣(qi)傳至人的耳(er)朵(duo)中。
這樣，就完(wan)成了最(zui)簡單的通話過程。
電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)是美(mei)國(guo)人A.G.貝(bei)爾(er)于(yu)1876年發(fa)(fa)(fa)明的。他用兩根導線連(lian)接(jie)兩個結構(gou)(gou)完全(quan)相同(tong)、在(zai)電(dian)(dian)(dian)(dian)磁鐵(tie)上(shang)(shang)裝(zhuang)有(you)振(zhen)(zhen)動(dong)膜(mo)片的送(song)(song)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)器(qi)和受(shou)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)器(qi)，首先實現(xian)兩端通(tong)(tong)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)。但通(tong)(tong)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)距離(li)短、效(xiao)率低。1878年出(chu)現(xian)了炭精送(song)(song)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)器(qi)，使電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)送(song)(song)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)器(qi)效(xiao)率大(da)大(da)提高。受(shou)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)器(qi)結構(gou)(gou)也有(you)改進(jin)。最(zui)早(zao)的電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)是磁石電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)，靠自備(bei)電(dian)(dian)(dian)(dian)池供電(dian)(dian)(dian)(dian)，用手搖發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)機(ji)(ji)發(fa)(fa)(fa)送(song)(song)呼叫(jiao)信(xin)號(hao)(hao)。1880年出(chu)現(xian)共(gong)電(dian)(dian)(dian)(dian)式(shi)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)，改由(you)共(gong)電(dian)(dian)(dian)(dian)交(jiao)換機(ji)(ji)集(ji)中供電(dian)(dian)(dian)(dian)，省去手播發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)機(ji)(ji)和干電(dian)(dian)(dian)(dian)池。1891年出(chu)現(xian)了旋轉(zhuan)撥(bo)號(hao)(hao)盤(pan)式(shi)自動(dong)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)，它可以發(fa)(fa)(fa)出(chu)直(zhi)流撥(bo)號(hao)(hao)脈沖，控制自動(dong)交(jiao)換機(ji)(ji)動(dong)作，選擇被叫(jiao)用戶，自動(dong)完成(cheng)交(jiao)換功能(neng)(neng)。從而(er)把(ba)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)通(tong)(tong)信(xin)推向(xiang)一個新階段。到20世(shi)紀60年代(dai)末期出(chu)現(xian)了按(an)鍵式(shi)全(quan)電(dian)(dian)(dian)(dian)子(zi)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)。除脈沖發(fa)(fa)(fa)號(hao)(hao)方式(shi)外，又出(chu)現(xian)了雙(shuang)音(yin)多(duo)(duo)頻（DTMF）發(fa)(fa)(fa)號(hao)(hao)方式(shi)。隨著(zhu)程控交(jiao)換機(ji)(ji)的發(fa)(fa)(fa)展，雙(shuang)音(yin)頻按(an)鍵電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)已逐步普及。電(dian)(dian)(dian)(dian)子(zi)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)電(dian)(dian)(dian)(dian)路正在(zai)向(xiang)集(ji)成(cheng)化邁進(jin)，話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)專用集(ji)成(cheng)電(dian)(dian)(dian)(dian)路已廣泛用于(yu)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)電(dian)(dian)(dian)(dian)路各組(zu)成(cheng)部分。各種多(duo)(duo)功能(neng)(neng)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)和特種用途電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)也應運而(er)生。到20世(shi)紀90年代(dai)初，已有(you)了將撥(bo)號(hao)(hao)、通(tong)(tong)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)、振(zhen)(zhen)鈴三種功能(neng)(neng)集(ji)于(yu)一塊(kuai)集(ji)成(cheng)電(dian)(dian)(dian)(dian)路上(shang)(shang)的電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)。隨著(zhu)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)音(yin)識別(bie)技術的發(fa)(fa)(fa)展，直(zhi)接(jie)用話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)音(yin)“撥(bo)號(hao)(hao)”的新型(xing)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)(hua)機(ji)(ji)也正在(zai)出(chu)現(xian)。
最初(chu)的電(dian)(dian)(dian)話(hua)機(ji)（終(zhong)(zhong)端）是由(you)微(wei)型發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)和電(dian)(dian)(dian)池構成(cheng)的磁石式(shi)電(dian)(dian)(dian)話(hua)機(ji)，打電(dian)(dian)(dian)話(hua)時，使用者用手搖微(wei)型發(fa)(fa)(fa)電(dian)(dian)(dian)機(ji)發(fa)(fa)(fa)出電(dian)(dian)(dian)信(xin)號(hao)呼叫(jiao)對方，對方啟機(ji)后(hou)構成(cheng)通(tong)話(hua)回路。后(hou)來，1877年(nian)愛迪生（T.E.Edison）發(fa)(fa)(fa)明(ming)了(le)碳素送話(hua)器和誘導(dao)線路后(hou)通(tong)話(hua)距(ju)離延長了(le)。同(tong)一年(nian)又發(fa)(fa)(fa)明(ming)了(le)共電(dian)(dian)(dian)式(shi)電(dian)(dian)(dian)話(hua)機(ji)。1891年(nian)終(zhong)(zhong)于(yu)發(fa)(fa)(fa)展到A.B.Strowger發(fa)(fa)(fa)明(ming)了(le)自動式(shi)電(dian)(dian)(dian)話(hua)機(ji)。
電(dian)話機設置在電(dian)話通(tong)(tong)信起點(dian)和(he)(he)終(zhong)點(dian)的(de)(de)用戶(hu)側，是電(dian)話網(wang)的(de)(de)用戶(hu)終(zhong)端設備。現(xian)代的(de)(de)電(dian)話機能(neng)夠(gou)方便地實現(xian)終(zhong)端用戶(hu)之間(jian)的(de)(de)呼(hu)叫和(he)(he)通(tong)(tong)話，是經過一百多年來(lai)許多人的(de)(de)研究(jiu)和(he)(he)無數次(ci)的(de)(de)改進而(er)形成的(de)(de)。盡管它們的(de)(de)式樣千差萬別，但(dan)一般(ban)都有如下基本功(gong)能(neng)：
1、聲電互換
因為(wei)要進行快速的、遠距(ju)離的通信(xin)，不(bu)能直接傳送聲音，而(er)必須(xu)先(xian)把聲音變成(cheng)電信(xin)號(hao)（即以電作為(wei)載(zai)體），到對(dui)方后再把電信(xin)號(hao)還原成(cheng)為(wei)聲音。
2、摘機識別
當主叫方(fang)拿(na)起電話機(ji)時，交(jiao)換(huan)機(ji)應有(you)能知(zhi)道“有(you)人(ren)要打電話”的功能，以便交(jiao)換(huan)機(ji)做好接續準備(bei)。
3、發送信號
自(zi)動電話(hua)機(ji)正是通過發送撥(bo)號信號來指揮電話(hua)交換機(ji)的工作，并(bing)進而建立(li)兩個(ge)電話(hua)機(ji)之間的連接(jie)的。
4、響鈴
即在對方來(lai)電(dian)話時，電(dian)話機能以鈴聲告訴主人：“有人來(lai)電(dian)話了(le)。”
5、電接續
電(dian)話機中，實現這五大功(gong)能(neng)的部件依次(ci)是：送受話器、叉簧(huang)、撥號盤(pan)（或按鍵盤(pan)）、電(dian)話鈴和電(dian)話回路(lu)。
電話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)具有將(jiang)終端的(de)(de)(de)(de)(de)(de)音(yin)(yin)波(bo)轉換(huan)(huan)為(wei)(wei)電子信(xin)號(hao)，通過電話(hua)(hua)(hua)線(xian)(xian)傳(chuan)(chuan)送(song)(song)(song)(song)到遠距離的(de)(de)(de)(de)(de)(de)對(dui)方(fang)(fang)(fang)(fang)，同時將(jiang)對(dui)方(fang)(fang)(fang)(fang)傳(chuan)(chuan)送(song)(song)(song)(song)來的(de)(de)(de)(de)(de)(de)電子信(xin)號(hao)再生(sheng)(sheng)為(wei)(wei)語音(yin)(yin)（音(yin)(yin)波(bo)），使其(qi)通話(hua)(hua)(hua)的(de)(de)(de)(de)(de)(de)功能(neng)，以及發(fa)送(song)(song)(song)(song)可從多個對(dui)方(fang)(fang)(fang)(fang)中選擇的(de)(de)(de)(de)(de)(de)信(xin)號(hao)（撥號(hao)脈(mo)沖），告知對(dui)方(fang)(fang)(fang)(fang)的(de)(de)(de)(de)(de)(de)呼(hu)叫音(yin)(yin)等功能(neng)。電話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)由將(jiang)語音(yin)(yin)轉換(huan)(huan)為(wei)(wei)電流(liu)(liu)發(fa)送(song)(song)(song)(song)到電話(hua)(hua)(hua)線(xian)(xian)的(de)(de)(de)(de)(de)(de)送(song)(song)(song)(song)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)、將(jiang)對(dui)方(fang)(fang)(fang)(fang)傳(chuan)(chuan)送(song)(song)(song)(song)來的(de)(de)(de)(de)(de)(de)電流(liu)(liu)還原為(wei)(wei)語音(yin)(yin)的(de)(de)(de)(de)(de)(de)受話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)、呼(hu)叫對(dui)方(fang)(fang)(fang)(fang)的(de)(de)(de)(de)(de)(de)撥號(hao)或按鈕、發(fa)送(song)(song)(song)(song)呼(hu)叫音(yin)(yin)的(de)(de)(de)(de)(de)(de)鈴聲、將(jiang)這(zhe)些連接在電話(hua)(hua)(hua)線(xian)(xian)上執行其(qi)功能(neng)的(de)(de)(de)(de)(de)(de)線(xian)(xian)路網(wang)等組成(cheng)(cheng)。送(song)(song)(song)(song)話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)內有裝滿碳素(su)顆粒(li)的(de)(de)(de)(de)(de)(de)小箱子，其(qi)前方(fang)(fang)(fang)(fang)有薄(bo)硬鋁合(he)金振動(dong)板。振動(dong)板根據語音(yin)(yin)振動(dong)，振動(dong)碳素(su)顆粒(li)，碳素(su)顆粒(li)傳(chuan)(chuan)導電流(liu)(liu)，隨著(zhu)顆粒(li)的(de)(de)(de)(de)(de)(de)接觸程度，電阻發(fa)生(sheng)(sheng)變化(hua)，生(sheng)(sheng)成(cheng)(cheng)語音(yin)(yin)電流(liu)(liu)。受話(hua)(hua)(hua)機(ji)(ji)(ji)(ji)(ji)接受對(dui)方(fang)(fang)(fang)(fang)的(de)(de)(de)(de)(de)(de)語音(yin)(yin)電流(liu)(liu)后，在線(xian)(xian)圈上生(sheng)(sheng)成(cheng)(cheng)語音(yin)(yin)電流(liu)(liu)引起(qi)的(de)(de)(de)(de)(de)(de)磁(ci)力，振動(dong)鐵振動(dong)板，發(fa)出(chu)聲音(yin)(yin)。
無線環路(lu)-無繩電(dian)話(hua)
電話子母機
數字無繩電話
模擬無繩電話
移動電話手機
小靈通（無線電話(hua)）
隨著IT技術的(de)不斷的(de)飛速發展，嵌入式終端設備(bei)的(de)處理(li)能力越(yue)來越(yue)強，21世紀(ji)初出現了一種帶個(ge)人數據助理(li)（PDA）的(de)電話機“智能電話”。
智(zhi)能(neng)(neng)(neng)(neng)電(dian)(dian)(dian)話(hua)除了有(you)完整的(de)(de)固(gu)定電(dian)(dian)(dian)話(hua)功(gong)能(neng)(neng)(neng)(neng)外(wai)，通(tong)常還具(ju)有(you)大(da)容量的(de)(de)名(ming)片管(guan)理(li)(li)功(gong)能(neng)(neng)(neng)(neng)、來去電(dian)(dian)(dian)管(guan)理(li)(li)功(gong)能(neng)(neng)(neng)(neng)、防止(zhi)電(dian)(dian)(dian)話(hua)騷擾（電(dian)(dian)(dian)話(hua)防火墻）功(gong)能(neng)(neng)(neng)(neng)、企業集(ji)團電(dian)(dian)(dian)話(hua)名(ming)片（內部名(ming)片）管(guan)理(li)(li)功(gong)能(neng)(neng)(neng)(neng)，以及(ji)輔(fu)助辦(ban)公的(de)(de)許多功(gong)能(neng)(neng)(neng)(neng)，比如：日(ri)程安排、便箋、日(ri)歷、計算器等(deng)功(gong)能(neng)(neng)(neng)(neng)。早期的(de)(de)智(zhi)能(neng)(neng)(neng)(neng)電(dian)(dian)(dian)話(hua)通(tong)過撥號(hao)上網，具(ju)有(you)一定的(de)(de)信息交換能(neng)(neng)(neng)(neng)力，實現(xian)了發(fa)送短信、接收文(wen)字信息的(de)(de)功(gong)能(neng)(neng)(neng)(neng)。隨著(zhu)固(gu)網智(zhi)能(neng)(neng)(neng)(neng)電(dian)(dian)(dian)話(hua)在中國近十年的(de)(de)發(fa)展(zhan)，其(qi)處理(li)(li)能(neng)(neng)(neng)(neng)力加強，逐漸地增加了智(zhi)能(neng)(neng)(neng)(neng)手機（Smartphone）具(ju)有(you)的(de)(de)功(gong)能(neng)(neng)(neng)(neng)。
智(zhi)能電(dian)(dian)話已有(you)通過因(yin)特(te)網上網的能力及較強(qiang)的多媒的體功能。可以進行(xing)網絡(luo)瀏覽(lan)、音視頻的播放(fang)、具有(you)電(dian)(dian)子(zi)書(shu)、電(dian)(dian)子(zi)相框等(deng)功能。同時智(zhi)能電(dian)(dian)話在輔助辦公(gong)、輔助營(ying)銷、娛樂等(deng)方面的功能也有(you)了(le)大大的加(jia)強(qiang)。在對傳(chuan)統固(gu)定電(dian)(dian)話顛(dian)覆的基礎上，實現了(le)更多的商務(wu)功能和(he)PDA功能。
環境溫度：-10℃~40℃
相對(dui)濕度：45%~95%
大氣(qi)壓力：860~1060mbar
環(huan)境(jing)噪聲(sheng)：≤60dB(A)
1、工作頻率：300~3400HZ
2、脈沖通(tong)斷比：1.6±0.2∶1
3、雙音頻撥號(hao)頻偏：≤±1.5%
4、雙音(yin)頻信號電(dian)平：①低(di)頻群：-9±3dB；②高頻群：-7±3dB；③頻率(lv)組合中高頻分量比低(di)頻分量高2±1dB
5、振鈴聲級：≥70dB(A)
6、電聲性能：
①在0公里(li)時(shi)，客(ke)觀發送參(can)考當量(liang)≥+3；在3公里(li)時(shi)，客(ke)觀發送參(can)考當量(liang)≤+15；在5公里(li)時(shi)，客(ke)觀發送參(can)考當量(liang)≤+15。
②在(zai)0公(gong)(gong)里(li)時，客觀接收(shou)參(can)考當量(liang)(liang)≥－5；在(zai)3公(gong)(gong)里(li)時，客觀接收(shou)參(can)考當量(liang)(liang)≤+2；在(zai)5公(gong)(gong)里(li)時，客觀接收(shou)摻考當量(liang)(liang)≤+2。
③在(zai)(zai)0公(gong)(gong)里時，客(ke)觀(guan)側音參(can)考當(dang)(dang)量≥+3；在(zai)(zai)3公(gong)(gong)里時，客(ke)觀(guan)側音參(can)考當(dang)(dang)量≥+10；在(zai)(zai)5公(gong)(gong)里時，客(ke)觀(guan)側音參(can)考當(dang)(dang)量≥+10。
高(gao)科技電話(hua)(hua)機的(de)(de)(de)(de)發(fa)展(zhan)都(dou)是隨(sui)著無線通(tong)信的(de)(de)(de)(de)發(fa)達而形成的(de)(de)(de)(de)。電話(hua)(hua)機的(de)(de)(de)(de)發(fa)展(zhan)趨勢經(jing)過(guo)Digital電話(hua)(hua)機和PCS后發(fa)展(zhan)到可(ke)以用(yong)(yong)衛(wei)星通(tong)信的(de)(de)(de)(de)IMT-200服(fu)務。IMT-200支持(chi)信息的(de)(de)(de)(de)高(gao)速傳送，Packet，畫像等多媒體的(de)(de)(de)(de)服(fu)務，將(jiang)來世界各個(ge)地方都(dou)可(ke)以使用(yong)(yong)所有聲音電話(hua)(hua)，電報用(yong)(yong)戶直通(tong)電路，傳呼(hu)和電子(zi)郵件；隨(sui)著電子(zi)郵件的(de)(de)(de)(de)普及(ji)，網絡(luo)也(ye)日益(yi)化，網絡(luo)電話(hua)(hua)已是不可(ke)阻擋(dang)的(de)(de)(de)(de)發(fa)展(zhan)趨勢。現有的(de)(de)(de)(de)固定電話(hua)(hua)，已經(jing)不能提供人們的(de)(de)(de)(de)需要了。未來的(de)(de)(de)(de)固定電話(hua)(hua)講裝備(bei)攝像頭(tou)，帶有色彩的(de)(de)(de)(de)液(ye)晶顯(xian)示器(qi)，我們在接固定電話(hua)(hua)的(de)(de)(de)(de)時候(hou)，都(dou)能夠看到雙方。
精靈世界
】編(bian)輯上傳(chuan)提供，詞條屬(shu)于(yu)開放(fang)詞條，當前(qian)頁(ye)面所展示的(de)詞條介紹涉及宣傳(chuan)內容(rong)(rong)(rong)屬(shu)于(yu)注冊用戶(hu)個人(ren)編(bian)輯行(xing)為(wei)，與【電話(hua)機】的(de)所屬(shu)企業/所有人(ren)/主體(ti)無關，網(wang)(wang)站不完全保證(zheng)內容(rong)(rong)(rong)信(xin)息的(de)準(zhun)(zhun)確性(xing)、真(zhen)實性(xing)，也不代表本(ben)站立場，各項數(shu)據(ju)信(xin)息存在(zai)更新不及時的(de)情(qing)況，僅(jin)供參(can)考(kao)，請(qing)以官方發布為(wei)準(zhun)(zhun)。如果(guo)頁(ye)面內容(rong)(rong)(rong)與實際情(qing)況不符，可(ke)點(dian)擊(ji)“反(fan)饋”在(zai)線向網(wang)(wang)站提出修改(gai)，網(wang)(wang)站將核實后進行(xing)更正。
反饋
