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首頁(yè)> 美國(guó)政府科技報(bào)告 >Effects of the Wireless Channel, Signal Compression and Network Architecture on Speech Quality in Voip Networks.

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Effects of the Wireless Channel, Signal Compression and Network Architecture on Speech Quality in Voip Networks.

機(jī)譯：無(wú)線信道，信號(hào)壓縮和網(wǎng)絡(luò)結(jié)構(gòu)對(duì)Voip網(wǎng)絡(luò)語(yǔ)音質(zhì)量的影響。

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Voice over Internet Protocol (VoIP) telephony is an emerging technology slowly finding its way into military applications. It provides several advantages over PSTN but comes short on performance, quality of service and availability. The purpose of this thesis is to measure the quality of voice in VoIP communications. More specifically it investigates the effects of wireless channel conditions as well as channel coding and compression on the received speech quality. Both simulation and experimentation are conducted using Matlab code and Speex software and across commercial VoIP networks. Simulation shows that fading channel parameters can heavily affect the quality of received speech. Speech compression results in bit rate gain, but, on the other hand, the signal becomes more sensitive to errors. The performance of an outdoor wireless network is better than that of an indoor network. The VoIP network architecture can affect the received speech quality on a long-distance connection.

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Nikolaos, T.;
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年度 2007
頁(yè)碼 1-105
總頁(yè)數(shù) 105
原文格式 PDF
正文語(yǔ)種 eng
中圖分類工業(yè)技術(shù);
關(guān)鍵詞
Internet; Voice communications; Speech compression; Network architecture; Wireless links; Compression; Computer programs; Simulation; Networks; Parameters; Rates; Theses; Sensitivity; Short range(Time); Coding; Quality; Signals; Communications networks; Errors; Gain; Military applications; Radio links; Communications protocols; Radiotelephones; Fading(Electromagnetic waves); Outdoor; Channels; Speech; Digital communications; Voip(Voice over internet protocol);

機(jī)譯：互聯(lián)網(wǎng);語(yǔ)音通信;語(yǔ)音壓縮;網(wǎng)絡(luò)架構(gòu);無(wú)線鏈路;壓縮;計(jì)算機(jī)程序;模擬;網(wǎng)絡(luò);參數(shù);速率;論文;靈敏度;短程（時(shí)間）;編碼;質(zhì)量;信號(hào);通信網(wǎng)絡(luò);錯(cuò)誤;增益;軍事應(yīng)用;無(wú)線電鏈路;通信協(xié)議;無(wú)線電話;衰落（電磁波）;室外;頻道;語(yǔ)音;數(shù)字通信; Voip（互聯(lián)網(wǎng)協(xié)議語(yǔ)音）;

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專利

1. Convergent Architecture for Worldwide Interoperability for Microwave Access-Universal Mobile Telecommunications System-Wireless Local Area Network Interworking Using IP Multimedia Subsystem Signaling Analysis to Achieve Quality of Service [J] . G. Vijayalakshmy, G. Sivaradje Sensor Letters: A Journal Dedicated to all Aspects of Sensors in Science, Engineering, and Medicine . 2012,第8期

機(jī)譯：微波訪問(wèn)的全球互操作性的融合體系結(jié)構(gòu)-通用移動(dòng)電信系統(tǒng)-使用IP多媒體子系統(tǒng)信令分析實(shí)現(xiàn)服務(wù)質(zhì)量的無(wú)線局域網(wǎng)互通
2. Using multichannel wide-dynamic range compression in severely hearing-impaired listeners: effects on speech recognition and quality. [J] . Souza PE, Jenstad LM, Folino R Ear and hearing. . 2005,第2期

機(jī)譯：在嚴(yán)重聽(tīng)覺(jué)受損的聽(tīng)眾中使用多通道寬動(dòng)態(tài)范圍壓縮：對(duì)語(yǔ)音識(shí)別和質(zhì)量的影響。
3. Effects of multi-channel compression time constants on subjectively perceived sound quality and speech intelligibility. [J] . Hansen M Ear and hearing. . 2002,第4期

機(jī)譯：多通道壓縮時(shí)間常數(shù)對(duì)主觀感知的聲音質(zhì)量和語(yǔ)音清晰度的影響。
4. Effects of propagation path loss on the quality of VoIP over wireless mesh networks [C] . Aksu Suat, Kurt Gunes Karabulut 2011 IEEE 19th Signal Processing and Communications Applications Conference . 2011

機(jī)譯：傳播路徑損耗對(duì)無(wú)線網(wǎng)狀網(wǎng)絡(luò)中VoIP質(zhì)量的影響
5. Towards the quality of service for VoIP traffic in IEEE 802.11 wireless networks. [D] . Shin, Sangho. 2008

機(jī)譯：邁向IEEE 802.11無(wú)線網(wǎng)絡(luò)中VoIP流量的服務(wù)質(zhì)量。
6. Adaptive Redundant Speech Transmission over Wireless Multimedia Sensor Networks Based on Estimation of Perceived Speech Quality [O] . Jin Ah Kang, Hong Kook Kim 2011

機(jī)譯：基于感知語(yǔ)音質(zhì)量估計(jì)的無(wú)線多媒體傳感器網(wǎng)絡(luò)自適應(yīng)冗余語(yǔ)音傳輸
7. Effects of the wireless channel, signal compression and network architecture on speech quality in VOIP networks [O] . Nikolaos Tiantioukas 2007

機(jī)譯：無(wú)線信道，信號(hào)壓縮和網(wǎng)絡(luò)架構(gòu)對(duì)VOIP網(wǎng)絡(luò)中語(yǔ)音質(zhì)量的影響

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Effects of the Wireless Channel, Signal Compression and Network Architecture on Speech Quality in Voip Networks.

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