Title :
A digital bandpass/bandstop complementary equalization filter with independent tuning characteristics
Author :
Fontana, Federico ; Karjalainen, Matti
Author_Institution :
Dipt. di Informatica, Univ. of Verona, Italy
fDate :
4/1/2003 12:00:00 AM
Abstract :
A discrete-time realization of first-order (shelving) and second-order equalization filters is developed, providing bandpass/bandstop magnitude-complementary transfer functions. The bandpass transfer function is turned into a complementary one, and vice versa, switching between two structures that share a common allpass section containing the state variables of the equalizer. The present realization is an alternative to existing solutions, particularly in applications where the equalization parameters are dynamically varied.
Keywords :
audio signal processing; band-pass filters; band-stop filters; circuit tuning; digital filters; discrete time filters; equalisers; transfer functions; audio systems; bandpass transfer function; bandstop transfer functions; digital filter; discrete-time realization; first-order equalization filters; independent tuning characteristics; magnitude-complementary transfer functions; second-order equalization filters; shelving filters; tunable filters; Band pass filters; Cutoff frequency; Delay; Digital filters; Equalizers; Graphics; Hafnium; Signal processing; Transfer functions; Tuning;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2003.808546
