The grating can filter signal and permit light with certain wavelength to pass through, and the signal will be reflected which can't go.

光栅对光信号有一定的过滤作用，只允许一定波长的光通过，不能通过的光波将被反射回来。

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It would also need good shielding and special electronics to filter the DSSS signal from the radio-noise created by the Earth, the sun and the rest of the galaxy.

同时还需要良好的外层保护和特殊电子器件，从地球、太阳及其太空中传来的无线电“杂音”中过滤出dsss信号。

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A large log file is difficult to use because you need to filter out a lot of noise to find the useful signal.

较大的日志文件很难使用，这是因为它们需要过滤大量的噪声才能找到有用的信号。

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So, going forward, we need the power and voice of UGC news, as well as the curatorial tools and fact checking chops of working Journalists to help us filter signal from noise.

FORBES: Media. The Storm. And How Sandy Changes Reporting Forever.

The breakthrough came when researchers found that radios could be tweaked to filter out the signal from its own transmitter, something that already happens within noise-canceling headphones.

ENGADGET: 'Stanford gurus enable two-way radio communications. Over.'

These short-term assignments must get done fast--designing filter algorithms for digital signal processors, say, or writing software for Internet-based phone calls.

FORBES: Hello brain. Good-bye rules.