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目前,相当一部分用户,采用全磁迹的测试磁带(也称校准带、标准带等)测量立体声录音机放音部分的幅频特性,以致在低频端产生较大的测量误差。这主要是忽视了边缘效应的结果。“边缘效应”的概念是这样的(见本期第51页:即当磁带上已录信号的磁迹宽度,大
At present, a considerable number of users measure the amplitude-frequency characteristics of the playback part of the stereo recorder using full-track test tapes (also called calibration tapes, standard tapes and the like), resulting in large measurement errors at the low-frequency end. This is mainly to ignore the marginal effect of the results. The concept of “edge effect” is such (see page 51 of this issue: that is, when the track width of the recorded signal on the tape is large