In this system the detected signal difference between two neighbouring instantaneous times is served as the effective signal, and the system noise points at the detector noise.

它将相邻两瞬时所检测到的信号差值作为有效信号值，系统噪声则是探测器噪声。

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But taken together, they can make a difference and they send a signal that we are serious about changing how government operates,"

VOA: standard.2009.04.20

But while each of the previous cases seems almost lost to memory now, it is the national outpouring of outrage from people of all backgrounds in response to the Trayvon Martin case that could signal the difference between the last century and this one.

CNN: Trayvon's killing and Florida's tragic past

The difference is that the signal for "Game Over, " in this case a digital tombstone, pops up much later.

CNN: Virtual Nurture

Even if these figures are approximate, and if the structure of their economies goes some of the way to explaining these difference, they certainly signal an immense margin for improvement.

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