Experiments have shown that clicks or other impulsive noises which occur in telephone calls come from a number of sources, such as faulty construction of the switching equipment, defective earthing at exchanges and electromagnetic couplings in exchanges or on the line.
ITU-T P.55 FRENCH-1988由国际电信联盟 IX-ITU 发布于 1988。
ITU-T P.55 FRENCH-1988 在中国标准分类中归属于: M73 视频、脉冲系统设备。
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