ITU-T P.835 FRENCH-2003
评估包括噪声抑制算法在内的语音通信系统的主观测试方法.系列P:电话传输质量.电话设备.本地线路网络.评定质量的客观和主观方法

Subjective test methodology for evaluating speech communication systems that include noise suppression algorithm

作废

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标准号

ITU-T P.835 FRENCH-2003

发布

2003年

发布单位

国际电信联盟

 

 

适用范围

Typically, Noise Suppression Algorithms (NSA) operates on a noisy speech waveform and attempt to reduce the noise or background component without adversely affecting the speech or signal component of the waveform. This goal can often be realized for relatively low levels of noise suppression. For higher levels of noise suppression, however, NSA's often adversely affect the speech component as more noise is suppressed –there tends to be increasing degradation of the speech or signal component as more of the noise or background component is removed. In this situation subjects can often become confused as to what they should be responding to in their ratings of the overall “quality” of the waveforms – while the background may have been improved because there is less noise present in the waveform, the speech signal may have been degraded in the process. In a single-scale rating method, the ACR for example, each individual subject weights the signal and the background components in determining his ratings of overall speech quality. This weighting process introduces additional error variance in the subjects ratings of overall quality resulting in decreased reliability in those ratings. The methodology described in this Recommendation reduces the listener’s uncertainty by requiring him to successively attend to and rate the waveform on: the speech signal, the background noise, and the overall effect-speech + background.

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