The linear time-invariant filter can' t improve SNR of single frequency component.

线性时不变滤波不能提高单一频率分量信噪比。

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A t its most fundamental, computer science is about the search for better algorithms - more efficient ways for computers to do things like sort data or filter noise out of digital signals.

寻找最优的算法是计算机科学基础研究的方向之一，对数据进行排序或从电子信号中过滤掉噪音都是非常有效的方法。

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Based on T type filter, the new ballast can achieve a wide dimming range with a very narrow frequency variation range, and it can operate with low lamp current crest factor.

基于T型滤波器的调光方法，能在很窄的工作频率范围内实现深度调光，同时具有灯电流波峰因数低的优点。

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The whole mood in Cardiff was very pessimistic and Welsh supporters were saying they thought they were going to lose and this can't help but filter down to the team.

BBC: Jeremy Guscott column

The Muppets have, in many of their incarnations, sustained a certain amount of double entendre, and this documentary-style glimpse behind the scenes doesn't remove the gauzy filter in any way.

CNN: Review: 'The Muppets' still finding its felting

"Even the SEC spam filter can't stop this, " Cox acknowledged in the press conference Thursday.

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