The composite filter typically operates on a frequency repeater.

合成滤波器通常在频率中继器上操作。

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Then, a composite filter combining pre-filter and post-filter was adopted to control the high-frequency oscillation.

然后采用前置滤波和后置滤波结合的复合滤波方法来控制高频振荡。

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The invention provides a high-efficiency and low-resistance composite filter material and a preparation method thereof.

本发明涉及一种高效低阻复合过滤材料及其制备方法。

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The first permanent colour photograph was taken by Thomas Sutton who was working with Clerk Maxwell and is a composite of three black and white pictures, each one taken through a red, green or blue filter.

BBC: Pioneering colour photography