3. The method of claim 1 , wherein reducing a confidence threshold comprises: retrieving a current confidence threshold responsive to the received noise error; determining whether the current confidence threshold equals a minimum confidence threshold; and reducing the current confidence threshold by a preset amount based on the determination.
3. The method of claim 1 , wherein reducing a confidence threshold comprises: retrieving a current confidence threshold responsive to the received noise error; determining whether the current confidence threshold equals a minimum confidence threshold; and reducing the current confidence threshold by a preset amount based on the determination. 4. The method of claim 3 , wherein the confidence threshold is reduced by the preset amount two or more times responsive to at least two or more respective received noise errors.