VoIP语音质量测试
VoIP(Voice over Internet Protocol)为网络电话(又叫宽带电话)。VoIP和传统电话最大的不同在于语音的传输方式,VoIP不是通过电信运营商的传统电话网络进行传输,而是将语音(Voice)模拟信号进行数字化,将数据通过数据封包(Data Packet)的形式在IP互联网络(IP Network)上进行实时传输。
VoIP相对传统电话来说比较便宜甚至是免费的,而且还能够提供长时间在线的语音通话,广泛应用于国内外的长途电话中,网络通信前景广阔。但是由于VoIP通信是基于网络,受网络状态影响比较大,存在数据掉包、延迟等现象,清晰度与传统的固话有差距,通话语音质量差等缺点。为了提高VoIP的语音通话质量,睿辉声学实验室(VoiceX)可提供符合测试标准的环境和全套测试设备,为客户提供科学详细的测试数据,不断地在测试调试中得到更好的语音通话质量。
测试框图
被测样品DUT通过MFE IX或者路由器wifi注册到SIP Server, MFE VIII.1、MFE VI.1提供网络连接和模拟各种网络状态。DUT与内置仿真嘴和仿真耳的仿真人头进行语音交互,仿真人和MFE VI.1连接发送/接收语音信号。安装有测试系统的PC通过USB线分别连接MFE VIII.1、MFE VI.1和MFE IX,统一控制/分析发送/接收信号。
测试设备与环境
睿辉声学实验室(VoiceX)具有符合测试标准的全套测试设备和专业的测试工程师,能够为客户提供全面的测试方案和详细的咨询服务。
相关测试标准
--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