ITU-T G.113-2007
语音处理导致的传输故障.学习研讨会12

Transmission impairments due to speech processing Study Group 12

标准号

ITU-T G.113-2007

发布日期

2007年

实施日期

废止日期

无

中国标准分类号

M01

发布单位

IX-ITU

引用标准

ITU-T G.107-2005 ITU-T G.108-1999 ITU-T G.109-1999 ITU-T G.168-2007 ITU-T G.711-1989 ITU-T G.712-2001 ITU-T 0.132 ITU-T P.10-2006 ITU-T P.833-2001 ITU-T Q.551-2002 ITU-T Q.552-2001 ITU-T Q.553-2001 ITU-T Q.554-1996 ETSI ETR 250-1996 ETSI TR 102 356 V1.1.1

适用范围

This Recommendation provides guidance regarding transmission impairments introduced by digital speech processing systems. The information provided is for use in conjunction with the transmission planning approach described in [ITU-T G.107], [ITU-T G.108] and [ITU-T G.109]. The impairment factor method, used by the E-model of [ITU-T G.107], is now recommended. The earlier method that used quantization distortion units is no longer recommended. The E-model reflects the combined perceptual effects of different types of impairments on the end-to-end speech transmission performance by using impairment factors. Impairment factors represent the (degrading) contribution of one instrumentally measurable attribute of the connection (e.g., attenuation, loss), or of a complete piece of equipment (e.g., a low bit-rate coding and decoding process) on the overall quality as experienced by the user. This degradation is called an "impairment factor" in a general sense, and "equipment impairment factor" when it is related to the degradations due to a specific piece of equipment. The E-model is highly useful because it combines the effects of different impairment factors. Network and service planners who are concerned with end-to-end speech transmission performance can use impairment factors with the E-model to assess the effects of introducing speech processing technologies.

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