FFT method is used here to decode the multi - frequency Register signals, which is also suitable for other multi - frequency signals' detection.
解码部分采用FFT算法从频域进行检测，该方法也可用于其它多频信号的检测。
FFT method is used here to decode the multi - frequency Register signals, which is also suitable for other multi - frequency signals' detection.
解码部分采用FFT算法从频域进行检测，该方法也可用于其它多频信号的检测。
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