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write short notes on Low-pass filter.
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that passessignalswith afrequencylower than a certaincutoff frequencyandattenuatessignals with frequencies higher than the cutoff frequency. The exactfrequency responseof the filter depends on thefilter design. The filter is sometimes called ahigh-cut filter, ortreble-cut filterin audio applications. A low-pass filter is the complement of ahigh-pass filter.

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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
low-pass filter

(1) filter exhibiting frequency selective characteristic that allows low-frequency components of an input signal to pass from filter input to output unattenuated all high-frequency components are attenuated. 

(2) a tuned circuit designed to pass all frequencies below a designated cut-off frequency.

(3) a filter that passes signal components whose frequencies are small and blocks (or greatly attenuates) signal components whose frequencies are large. For the ideal case, if H(ω) is the frequency response of the filter, then H(ω) = 0 for |ω| > B, and H(ω) = 1 for |ω| < B. The parameter B is the bandwidth of the filter. A filter whose impulse response is a low-pass signal.
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