LowHighPassFilter

The low pass filter allows low frequency signals to pass, but attenuates (or reduces) the passage of signals with frequencies above the cutoff frequency. For different filters, the attenuation of the signal at each frequency is different. When used in audio applications, it is sometimes referred to as a high frequency shear filter, or a treble cancellation filter.

The high pass filter is the opposite, and the band pass filter is a combination of a high pass filter and a low pass filter.

The low-pass filter concept has many different forms, including electronic circuits (such as the hass filter used in audio equipment, digital algorithms for smoothing data, acoustic barriers, image blurring, etc.). The role of low-pass filters in signal processing equates to the role of moving averages in other fields, such as the financial sector; both tools provide a smooth form of signal by eliminating short-term fluctuations and preserving long-term trends.