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Lecture
Ideal filters derived from the ideal lowpass filter
Description
This lecture explains how to derive ideal high pass and band pass filters from the ideal low pass filter. The high pass filter preserves frequencies from omega c to pi and its response is symmetric. The band pass filter preserves frequencies in a band centered around omega 0 and 2 omega c wide, obtained by modulating a prototype low pass filter with a cosine function.
Official source
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