Active filter A filter that employs active devices such as transistors or operational amplifiers in combination with R, L, and C elements.
Bode plot A plot of the frequency response of a system using straight-line segments called asymptotes.
Decibel A unit of measurement used to compare power levels.
Double-tuned filter A network having both a pass-band and a stop-band region.
Filter Networks designed to either pass or reject the transfer of signals at certain frequencies to a load.
High-pass filter A filter designed to pass high frequencies and reject low frequencies.
Log-log paper Graph paper with vertical and horizontal log scales.
Low-pass filter A filter designed to pass low frequencies and reject high frequencies.
Microbar (mbar) A unit of measurement for sound pressure levels that permits comparing audio levels on a dB scale.
Pass-band (band-pass) filter A network designed to pass signals within a particular frequency range.
Passive filter A filter constructed of series, parallel, or series-parallel R, L, and C elements.
Semilog paper Graph paper with one log scale and one linear scale.
Stop-band filter A network designed to reject (block) signals within a particular frequency range.