ITU-T R 4-1988 METHODS FOR THE SEPARATE MEASUREMENTS OF THE DEGREES OF VARIOUS TYPES OF TELEGRAPH DISTORTION《电话与话上电报在同一电缆内的共存》.pdf
《ITU-T R 4-1988 METHODS FOR THE SEPARATE MEASUREMENTS OF THE DEGREES OF VARIOUS TYPES OF TELEGRAPH DISTORTION《电话与话上电报在同一电缆内的共存》.pdf》由会员分享,可在线阅读,更多相关《ITU-T R 4-1988 METHODS FOR THE SEPARATE MEASUREMENTS OF THE DEGREES OF VARIOUS TYPES OF TELEGRAPH DISTORTION《电话与话上电报在同一电缆内的共存》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 2 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(94%,%2!0(G0G042!.3-)33)/.-%4(/$3G0G0 amended at Geneva, 1980)For separate measurements of the degrees of characteristic distortion, bias distortion and fortuitous distortionaffecting a telegraph modul
2、ation or restitution, the following is recommended where circuits and voice-frequencytelegraph (VFT) channels are used to carry information employing International Telegraph Alphabet No. 2, withoutregeneration;1 Measure the degree of overall distortion (at the actual mean modulation rate) on text, f
3、or instance the QKS textspecified in Recommendation R.51 bis. Let be the measurement obtained.2 Measure the degree of distortion on reversals at the modulation rate used in the measurement of (1) above.Let 1be the measurement obtained. 1is the sum of the bias and fortuitous distortions.3 By using a
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