Time Reversal processing (TRP) is a signal processing method based on the focusing property. It attached more attention in underwater acoustic communication, active detection and so on.

时间反转处理(trp)是利用这种聚焦特性的信号处理方法，它在水声通信、主动声纳检测这类脉冲—回波型领域的应用研究越来越受到重视。

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The principle of the detection of the focusing error signal in a holographic optic head is dis - cussed.

讨论了全息光学头聚焦误差信号检测的基本原理。

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Common focus point (CFP) migration based on the equal travel-time principle is a kind of pre-stack depth migration method through focusing in both emission and detection.

共聚焦点(CFP)偏移是基于等时原理，通过激发聚焦和检波聚焦的双聚焦实现叠前深度偏移的地震成像方法。

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The Z80 features a 3X optical zoom, face detection and an intelligent focusing system that locks in the correct focus, while the Z200 rocks a 4X optical zoom and wide angle lens -- down to 28mm.

ENGADGET: Casio intros a handful of new compact cams that play nice with iTunes