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