| http://www.w3.org/ns/prov#value | - A method for detecting N feedback frequencies in a digitized signal where N is a finite positive integer greater than or equal to 2, the method comprising the steps of:constructing an array of digital filters, the array being arranged in a tree structure having N branches, wherein each branch of the N branches includes N filters, wherein N-1 of the N filters in each branch are notch filters that a
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