ITU-T SERIES P SUPP 21-1993
将复合源信号作为决定终端设备传输特性的测量信号的原则.12号研究组

THE PRINCIPLES OF A COMPOSITE SOURCE SIGNAL AS AN EXAMPLE OF A MEASUREMENT SIGNAL TO DETERMINE THE TRANSFER CHARACTERISTICS OF TERMINAL EQUIPMENT (Study Group XII)

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标准号

ITU-T SERIES P SUPP 21-1993

发布日期

1993年03月01日

实施日期

废止日期

无

中国标准分类号

M00;M30

发布单位

IX-ITU

适用范围

Non-linear processes such as Acoustic Echo Control (AEC), Automatic Gain Control (AGC), compression systems, etc. are increasingly used in terminal equipment providing telephony, e.g. hands-free telephones or mobile telephone systems to improve speech transmission quality. Echo cancellers or echo suppressors also are used for echo reduction in the network in the case of long-distance calls. The transfer characteristics of all these types of equipment can not be described as linear and time-invariant (LTI). As a consequence, standard measurement procedures using stationary measurement signals can not be used to determine the transfer characteristics of such devices.