Method for the Active Reduction of Noise, and Device for Carrying Out Said Method
First Claim
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1. Method for active noise cancelling in an input signal (I), which is fed to an unknown transfer function (H), the method comprising:
- estimating the unknown transfer function (H) or its actual output signal (O), respectively, with the aid of an adaptive process by using the input signal (I) and an error signal (ε
), the error signal (ε
) corresponding to the difference between an estimated output signal (O*) and the actual output signal (O), andsubtracting the estimated output signal (O*) from the actual output signal (O) to form a noise reduced output signal (Q),wherein a desired signal (S) is superimposed on the noise reduced output signal (Q), the desired signal (S) not affecting the error signal (ε
), and wherein a computation cycle of the adaptive process is longer than a clock interval of the desired signal (S).
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Abstract
Disclosed in a method in which a digital system is used for actively reducing noise. According to the method, a digital user signal can be transmitted at a different sampling rate, the sampling rate being adjusted with the aid of adequate converters.
16 Citations
11 Claims
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1. Method for active noise cancelling in an input signal (I), which is fed to an unknown transfer function (H), the method comprising:
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estimating the unknown transfer function (H) or its actual output signal (O), respectively, with the aid of an adaptive process by using the input signal (I) and an error signal (ε
), the error signal (ε
) corresponding to the difference between an estimated output signal (O*) and the actual output signal (O), andsubtracting the estimated output signal (O*) from the actual output signal (O) to form a noise reduced output signal (Q), wherein a desired signal (S) is superimposed on the noise reduced output signal (Q), the desired signal (S) not affecting the error signal (ε
), and wherein a computation cycle of the adaptive process is longer than a clock interval of the desired signal (S). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification