_Signal_FAQ04_Filter - What is a filter A filter is a...

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What is a filter? A filter is a device or system that processes an input signal to end up with an output signal. Usually, it is used to remove some undesirable components or enhance certain desirable components in the input. Filters may take many forms and may be constructed using a variety of structures. Analog electrical filters may be made using resistors, capacitors and op-amps. Filters may also be mechanical or biological in nature. As an example, the shock absorber that a bus uses can be regarded as a filter. It reduces the high frequency and high amplitude input vibration caused by uneven road surface to something that is more comfortable to feel when we are on the bus. Filters are usually characterized and designed based on their frequency response. A filter that rejects or attenuates high frequency signal components but allows low frequency components to pass through is called a “low pass filter” or “LPF”. Two typical LPF frequency responses are shown below. While both
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This note was uploaded on 08/02/2009 for the course ECE EE2009 taught by Professor Prof.c.c.ko during the Fall '07 term at National University of Singapore.

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_Signal_FAQ04_Filter - What is a filter A filter is a...

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