Strained, having impurities removed

ETYM French filtre, the same word as feutre felt, Late Lat. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. Related to Feuter.
(Homonym: philter, philtre).
1. Alters the frequency spectrum of signals passing through it.
2. Removes something from whatever passes through it.

In electronics, a circuit that transmits a signal of some frequencies better than others. A low-pass filter transmits signals of low frequency and direct current; a high-pass filter transmits high-frequency signals; a band-pass filter transmits signals in a band of frequencies.An electrical circuit that passes frequencies within a specified frequency band and attenuates signals that fall outside of that frequency band. + prikaži više