Title :
Feedforward ANC system using adaptive FIR filters with on-line secondary path identification
Author :
Tak Keung Yeung ; Sze Fong Yau
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol.
Abstract :
In this paper, the equalization of secondary paths of a feedforward multiple points active noise control (ANC) system with on-line secondary path identification is discussed. By introducing extra acoustical signal-transmission secondary paths produced by multiple loudspeakers, we can achieve the equalization of non-minimum-phase secondary paths by FIR filters. Our system can be simplified by combining the primary path identifier and secondary path equalizer. Then the update equation of the adaptive FIR filter of our system is derived according to the LMS algorithm. Next, on-line secondary path identification is implemented in our system by another adaptive FIR filter. Simulation results show that our system can achieve high low-frequency noise attenuation
Keywords :
FIR filters; acoustic signal processing; active noise control; adaptive equalisers; feedforward; filtering theory; identification; least mean squares methods; LMS algorithm; MIMO system; acoustical signal-transmission secondary paths; active noise control system; adaptive FIR filters; equalization; feedforward ANC system; high LF noise attenuation; low-frequency noise attenuation; multiple loudspeakers; multiple points ANC; nonminimum-phase secondary paths; online secondary path identification; primary path identifier; secondary path equalizer; update equation; Active noise reduction; Adaptive systems; Attenuation; Control systems; Equalizers; Equations; Finite impulse response filter; Least squares approximation; Loudspeakers; Low-frequency noise;
Conference_Titel :
Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on
Conference_Location :
Pafos
Print_ISBN :
0-7803-5682-9
DOI :
10.1109/ICECS.1999.813199
