1. An adaptive filter, comprising: a commutator having an input for receiving a signal to be filtered and providing a plurality of commutated outputs; a plurality of filter banks that each comprise a plurality of polyphase filters having an input and an output, and wherein the outputs of the plurality of filters are combined to produce a single output signal of the respective filter bank; wherein the commutated outputs of the commutator are directly coupled to inputs of the filters of a first filter bank; wherein the commutated outputs of the commutator are coupled by way of a plurality of first delay elements to inputs of the plurality of polyphase filters of a second filter bank; and wherein the commutated outputs of the commutator are coupled by way of a plurality of second delay elements to inputs of the plurality of polyphase filters of a third filter bank.