The picture elements across a line are converted to the video signal and low-pass filtered with an electrical filter .

沿着一条直线的图象象素被转换成视频信号，然后由一个电子滤波器进行低通滤波。

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This is possible using algorithms that filter out interference caused by external electrical activity.

能滤除外部电活动致干扰的算法使之成为可能。

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In the texts of electrical circuits and electronics they will also show how to build simple filter circuits using Op-Amp.

在电路和电子技术的文献中可以找到如何用运算放大器构造简单的滤波器。

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This is possible using algorithms that filter out interference caused by external electrical activity.

ECONOMIST: Brainwave controllers

They have long been employed in devices like mobile phones to filter electric signals (which can be done by converting electrical into mechanical energy and back again).

ECONOMIST: Acoustic microfluidics