When choruses sing in tune, the music reinforces itself with higher harmonics; aesthetically, the notes are more pleasing to the ear.
Electronic filter | Digital filter | Cherry Filter | Air filter | Photographic filter | Ohne Filter | Kalman filter | digital filter | Water filter | water filter | Stay Tuned | Shiva amplifier chains showing spatial filter tubes (white) and Nd:glass amplifier structures (short blue tubes closest to camera). Portions of the 1982 Disney film ''Tron | Sand filter | Probabilistic data association filter | Oil filter | Neutral density filter | Klaus Filter | Fram (oil filter) | elliptic filter | CSS filter | Cast Iron Filter | Band-pass filter | air filter | Adaptive filter |