中文说明：改进的过零检测法，克服传统的过零检测法的缺点，提高精度。
English Description：
The improved zero crossing detection method overcomes the shortcomings of the traditional zero crossing detection method and improves the accuracy.
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中文说明：改进的过零检测法，克服传统的过零检测法的缺点，提高精度。
English Description：
The improved zero crossing detection method overcomes the shortcomings of the traditional zero crossing detection method and improves the accuracy.