Patent ID: 7260163
Filing Date: 2007-08-21
Classification: H03G

Abstract:
1. A noise control circuit comprising: a first switch having a first terminal for receiving a sampled signal, a second terminal, a third terminal and a control terminal for receiving a control signal; an adaptive filter having an input coupled to the second terminal of the first switch, the adaptive filter having a plurality of coefficient updaters, an output of each of the plurality of coefficient updaters being summed to provide a predicted output signal that is connected to the third terminal of the first switch; a second switch having a first terminal coupled to the third terminal of the first switch, a second terminal coupled to the first terminal of the first switch, a third terminal coupled to an output of the noise control circuit, and a control terminal for receiving the control signal; and noise detecting circuitry for providing the control signal if noise associated with the sampled signal exceeds a predetermined threshold, the noise control circuit providing the sampled signal as an output signal of the noise control circuit when the control signal is not asserted and the noise control circuit providing the predicted output signal as the output signal of the noise control circuit when the control signal is asserted.