Active noise control system with on-line secondary path modeling
First Claim
1. 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).
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Accused Products
Abstract
An active noise control system is provided to specify an input transducer, an error transducer, an output transducer and an active noise controller for generating an anti-phase canceling acoustic signal to attenuate an input noise and to output a reduced noise. The active noise control system also performs on-line secondary path modeling. For this purpose the active noise control system comprises, in addition to known systems, a secondary path change detection circuitry (6), a signal distinguishing circuitry (7) and an auxiliary noise control circuitry (8), all of them being used to model said secondary path. FIG. 3
85 Citations
15 Claims
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1. 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)), andsaid 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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification