US Patent 9432761 Signal processor

One example discloses a signal processor, including: a signal input having an input bandwidth; a first transducer output; a second transducer output; a filter network coupled to the signal input, the first transducer output and the second transducer output; wherein the filter network is configured to output a first portion of the input bandwidth on the first transducer output and a second portion of the input bandwidth on the second transducer output; and a control module coupled to the filter network and configured to adjust the first and second portions of the input bandwidth in response to signal degradation on the first transducer output.