EETimes - Digital Lowpass: A filter by any other name is still a filter
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175 237MHz DAB digital audio broadcasting band bandpass filter, SMA interface|Earphone Accessories| - AliExpress
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Customized Optical IR-Cut Blue Bandpass Filter for Digital Camera - China Optical Filter, Optical Windows | Made-in-China.com
A Simple Digitally Tunable Active RC Filter | Analog Devices
Filter (signal processing) - Wikipedia
