ITU-T O.81 APP.1-1998
电话型电路用群延迟测量设备.附录1:电话型电路用振幅和相位的快速测量用测量信号(多频声试验信号)

Group-Delay Measuring Equipment for Telephone-Type Circuits - Appendix I: A Measuring Signal (Multitone Test Signal) for Fast Measurement of Amplitude and Phase for Telephone Type Circuits - Series O: Specifications of Measuring Equipment - Equipment for

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标准号

ITU-T O.81 APP.1-1998

发布日期

1998年06月01日

实施日期

废止日期

无

中国标准分类号

M40

发布单位

IX-ITU

适用范围

The multitone test signal (MTTS) consists of a spectrum of N discrete signals separated by frequency spacing of 100 Hz in the low frequency range. The spectral lines are all of equal amplitude; their phase relationship to each other is chosen on the basis of mathematical considerations so that the energy of the test signal is distributed approximately evenly across the entire period of the test signal. The transmission characteristics, i.e. the amplitude and phase distortion of a telephone line, produce changes in the test signal. On the receive side, these changes are measured and evaluated, e.g. by means of a Fourier analysis. The results may be displayed on a screen in the form of an amplitude andor phase graph and also, for example, the group delay may be derived from this.

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