The differential signal is the spike pulse signal that is produced by differential circuit. Original differential circuit is very difficult to obtain the ideal differential signal.

微分信号是由微分电路产生的一种“尖峰”脉冲信号，原来的微分电路很难获得理想的微分信号。

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Fallen angels still beat original issues during 2002-2011, but the differential (0.50 percentage points) was much smaller than in 1997-2006 (1.11 percentage points).

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