VoIP（Voice over Internet Protocol）為網(wǎng)絡(luò)電話（又叫寬帶電話）。VoIP和傳統(tǒng)電話最大的不同在于語(yǔ)音的傳輸方式，VoIP不是通過(guò)電信運(yùn)營(yíng)商的傳統(tǒng)電話網(wǎng)絡(luò)進(jìn)行傳輸，而是將語(yǔ)音（Voice）模擬信號(hào)進(jìn)行數(shù)字化，將數(shù)據(jù)通過(guò)數(shù)據(jù)封包（Data Packet）的形式在IP互聯(lián)網(wǎng)絡(luò)（IP Network）上進(jìn)行實(shí)時(shí)傳輸。
VoIP相對(duì)傳統(tǒng)電話來(lái)說(shuō)比較便宜甚至是免費(fèi)的，而且還能夠提供長(zhǎng)時(shí)間在線的語(yǔ)音通話，廣泛應(yīng)用于國(guó)內(nèi)外的長(zhǎng)途電話中，網(wǎng)絡(luò)通信前景廣闊。但是由于VoIP通信是基于網(wǎng)絡(luò)，受網(wǎng)絡(luò)狀態(tài)影響比較大，存在數(shù)據(jù)掉包、延遲等現(xiàn)象，清晰度與傳統(tǒng)的固話有差距，通話語(yǔ)音質(zhì)量差等缺點(diǎn)。為了提高VoIP的語(yǔ)音通話質(zhì)量，睿輝聲學(xué)實(shí)驗(yàn)室（VoiceX）可提供符合測(cè)試標(biāo)準(zhǔn)的環(huán)境和全套測(cè)試設(shè)備，為客戶提供科學(xué)詳細(xì)的測(cè)試數(shù)據(jù)，不斷地在測(cè)試調(diào)試中得到更好的語(yǔ)音通話質(zhì)量。

測(cè)試框圖
被測(cè)樣品DUT通過(guò)MFE IX或者路由器wifi注冊(cè)到SIP Server, MFE VIII.1、MFE VI.1提供網(wǎng)絡(luò)連接和模擬各種網(wǎng)絡(luò)狀態(tài)。DUT與內(nèi)置仿真嘴和仿真耳的仿真人頭進(jìn)行語(yǔ)音交互，仿真人和MFE VI.1連接發(fā)送/接收語(yǔ)音信號(hào)。安裝有測(cè)試系統(tǒng)的PC通過(guò)USB線分別連接MFE VIII.1、MFE VI.1和MFE IX，統(tǒng)一控制/分析發(fā)送/接收信號(hào)。

測(cè)試設(shè)備與環(huán)境
睿輝聲學(xué)實(shí)驗(yàn)室（VoiceX）具有符合測(cè)試標(biāo)準(zhǔn)的全套測(cè)試設(shè)備和專(zhuān)業(yè)的測(cè)試工程師，能夠?yàn)榭蛻籼峁┤娴臏y(cè)試方案和詳細(xì)的咨詢服務(wù)。

相關(guān)測(cè)試標(biāo)準(zhǔn)
–EIA/TIA-810
Telecommunications Telephone Terminal Equipment Transmission Requirements for Narrowband Digital Telephones, (North America), Digital & VoIP Terminals

–TIA-920
Digital Interface Communications Devices with Handsets

–ITU-T G.168,
SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone connections and circuits – Apparatus associated with long distance telephone circuits; Digital network echo canceller

–FZ TSEC
Technical Specification EC Deutsche Telekom AG, Network Speech Echo Cancellers

–FZ TSEC-L
Technical Specification EC Deutsche Telekom AG, Network Speech Echo Cancellers incl. Limits

–ETSI ES 202 737 / ES 202 738,
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for narrowband VoIP terminals (handset and headset + loud speaking and handsfree ) from a QoS perspective as perceived by the user; Narrowband IP Phones

–ETSI ES 202 739 / ES 202 740,
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for wideband VoIP terminals (handset and headset + loud speaking and handsfree terminals) from a QoS perspective as perceived by the user; Wideband IP Phones

–TS 102 924/925
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for Super-Wideband / Full band handset and headset / handsfree and conferencing terminals from a QoS perspective as perceived by the user

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