filter
filter: In electronics, a device which transmits only part of the incident energy and may thereby change the spectral distribution of energy:
- (a) high pass filters transmit energy above a certain frequency;
- (b) low pass filters transmit energy below a certain frequency;
- (c) band pass filters transmit energy of a certain bandwidth;
- (d) band stop filters transmit energy outside a specific frequency band. [JP 1-02]