An electronic filter that allows only certain frequencies of signals to pass through while blocking others, used in radios and communications equipment.
Compound of band and pass, created in the 20th century as electronic and radio technology developed. Band refers to a range of frequencies.
Every radio you've ever used contains bandpass filters deciding which station you hear—without them, all radio waves would jumble together into useless noise, so this humble component is actually crucial to modern life.
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