Patent ID: 6847721

Claim:
An active noise control system with on-line secondary path modeling comprising: an input transducer ( 1 ) operable to output an input noise (x(n)) received; a primary path ( 2 ) and first means ( 4 , 6 , 12 , 32 , 41 , 51 , 52 , 53 ) for on-line modeling said input noise (x(n)), said first means ( 4 , 6 , 12 , 32 , 41 , 51 , 52 , 53 ) receiving said input noise (x(n)) and outputting a canceling signal (y′(n)); said primary path ( 2 ) outputting a primary noise (d(n)), and an error transducer ( 11 ) receiving said primary noise (d(n)) and said canceling signal (y′(n)) and outputting an error signal (e(n)); said error signal (e(n)) being the result of a subtraction of said canceling signal (y′(n)) from said primary noise (d(n)), and said error signal (e(n)) serving as a control signal for controlling said first means ( 4 , 6 , 12 , 32 , 41 , 51 , 52 , 53 ) for on-line modeling and serving as an output signal of the active noise control system; wherein said active noise control system further comprises a second means ( 6 , 7 , 8 ) for on-line modeling said first means ( 4 , 6 , 12 , 32 , 41 , 51 , 52 , 53 ), receiving said input noise (x(n)), said error signal (e(n)) and an auxiliary noise (u(n)) and outputting a modified error signal (e′(n)), a modeling desired signal (h(n)) and a modified auxiliary noise (u′(n)) to said first means ( 4 , 6 , 12 , 32 , 41 , 51 , 52 , 53 ).