时钟等快速开关信号必须利用数字地屏蔽起来，以免向电路板上的其它器件辐射噪声，并且绝不应靠近基准输入。
Fast switching signals, such as clocks, must be shielded with digital ground to avoid radiating noise to other parts of the board, and must never be run near the reference inputs.
然后，解调后的信号和基准压电水听器的信号输入到一个高分辨率的数字鉴相器的相位差。
Then the demodulated signal and the signal of the reference piezoelectric hydrophone were input into a high-resolution digital phase detector to get the phase difference.
然后，解调后的信号和基准压电水听器的信号输入到一个高分辨率的数字鉴相器的相位差。
Then the demodulated signal and the signal of the reference piezoelectric hydrophone were input into a high-resolution digital phase detector to get the phase difference.
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