1. A method of reducing noise in a noise-contaminated signal, the method comprising the steps of: obtaining a noise-indicative signal which is indicative of a source of the noise; inputting the noise-indicative signal to an adaptive filter; summing an output signal of the adaptive filter with the noise-contaminated signal; inputting a sum resulting from the summing step to the adaptive filter; and adapting the adaptive filter in response to the noise-indicative signal inputting and sum inputting steps.