<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2013) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2013) (Learn how and when to remove this template message) </Td> </Tr> <P> A low - pass filter (LPF) is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency . The exact frequency response of the filter depends on the filter design . The filter is sometimes called a high - cut filter, or treble - cut filter in audio applications . A low - pass filter is the complement of a high - pass filter . </P> <P> Low - pass filters exist in many different forms, including electronic circuits such as a hiss filter used in audio, anti-aliasing filters for conditioning signals prior to analog - to - digital conversion, digital filters for smoothing sets of data, acoustic barriers, blurring of images, and so on . The moving average operation used in fields such as finance is a particular kind of low - pass filter, and can be analyzed with the same signal processing techniques as are used for other low - pass filters . Low - pass filters provide a smoother form of a signal, removing the short - term fluctuations, and leaving the longer - term trend . </P>

Difference between high pass and low pass filter
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