Speech Processing, Transmission and Quality Aspects (STQ); Specification and measurement of speech transmission quality; Part 3: Non-intrusive objective measurement methods applicable to networks and links with classes of services
语音处理、传输和质量方面(STQ);语音传输质量的规范和测量;第3部分:适用于具有服务类别的网络和链路的非侵入性客观测量方法