Method and apparatus for nonlinear compensation in an active noise control system
AssigneeUniversiti Putra Malaysia
InventorsMohd Kamil Raja Ahmad RAJA, Abdulredha Sahib MOUAYAD, Ghasemi Dehkordi SEPEHR
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Abstract
A self tuned apparatus (100) for active noise control includes a first transducer (105) and a second transducer (110), a noise controlling module (115), a power amplifier (120) and a first loudspeaker (125) and a second loudspeaker (130) coupled to the power amplifier (120). The noise controlling module (115) is coupled to the first transducer (105) and the second transducer (110). The power amplifier (120) is coupled to the noise controlling module (115). Particularly, the noise controlling module (115) employs at least one control algorithm.
Claims18
A self-tuned apparatus for controlling noise actively by compensating for secondary path non-linearities caused by at least one saturation effect in an active noise control system, said apparatus comprising:
- a first transducer (105) and a second transducer (110), said first transducer (105) being electrically coupled to said second transducer (110), wherein said first transducer (105) and said second transducer (110) are configured to receive a first acoustic signal and a second acoustic signal respectively;
- a noise controlling module (115) coupled to said first transducer (105) and said second transducer (110), wherein said noise controlling module (115) employs at least one control algorithm;
- at least one power amplifier coupled to said noise controlling module (115);
- and
- a first loudspeaker and a second loudspeaker coupled to said power amplifier.
A self tuned method for controlling active noise by compensating for at least one secondary path non-linearity caused by at least one saturation effect in an active noise control system, said method comprising the steps of:
- modeling said at least one secondary path non-linearity with saturation nonlinearity in at least one of a loudspeaker and/or a power amplifier;
- evaluating a degree of nonlinearity from an identified secondary path model;
- and
- determining at least one control algorithm for saturation nonlinearity in said at least one of said loudspeaker and/or said power amplifier.
A circuit comprising:
- a predistorter designed by inverting a modeled tangential hyperbolic function (THF) and operably coupling said inverted modeled tangential hyperbolic function (THF) with a nonlinear function of at least one of a power amplifier and a loudspeaker.
Dependencies are inferred from the claim text.