ITU-T P.56-1993由国际电信联盟 IX-ITU 发布于 1993-03-01。
ITU-T P.56-1993 在中国标准分类中归属于: M71 录制设备。
The CCITï considers it important that there should be a standardized method of objectively measuring speech level, so that measurements made by different Administrations may be directly comparable. Requirements of such a meter are that it should measure
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