This paper deals with the practical aspects of the design of two active noise control (ANC) systems to attenuate low frequency noise. In the first instance, a hybrid passive-active control system to reduce the noise radiated by a small generator has been designed. A SISO ANC system, in a side branch of the exhaust tube, attenuates some of the harmonics of the lowfrequency exhaust noise as much as 27 dB. In the second instance, a MIMO ANC system is designed to alleviate the booming inside a van. The booming is reduced more than 20 dB at the front seats.

2 páginas, 2 figuras.-- Trabajo presentado al XV Symposium Nacional de la Unión Científica Internacional de Radio celebrado en Zaragoza (Españ) del 13 al 15 de Septiembre de 2000.

This work was supported by the CICYT, through grant AMB97-1175-C03-01.

Peer reviewed