Low Pass Filter
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Low Pass Filter

Like all filters, the low pass filter is designed to let some things through but not others. The principle behind low pass filters is to preserve or even amplify signals with frequencies below a certain point.  This point is known as the corner frequency and is located at the point where the gain is -3db.

A low pass filer with a corner frequency of 500Hz would maintain a signal of 200hz but would block a signal with a frequency of 600hz.

Examples

There are two types of filters: analog and digital. The two filters work in fundamentally different ways. The analog filter actually changes the signal depending on frequency, where as the digital filter uses different sample rates to filter unwanted data.

Analog Filters

There are two types of analog filters passive, and active. The passive filter uses discrete components to degrade signals of unwanted frequencies. The active filters change the amplification of the signal depending on its frequency.

References

This page is an Article on bildr. Articles are pages that define or explain a concept, method, or generic item.

NOTE: All information contained within this article is pure opinion. Although this article is intended to help people, it may contain faulty or misleading information. This article is not to be considered professional opinion or advice, and is in no way a replacement for reading all safety/instructional documentation. Always remember to protect yourself when handling/using hazardous materials, as well as test new techniques before using them on projects/work intended to be handed in or used.

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