A wideband signal distribution unit for receiving a plurality of inputs and having a plurality of outputs is provided. The distribution unit features a first combiner having an output and being connected to a first subset of the plurality of inputs. A second combiner having an output is connected to...http://www.google.com.tw/patents/US6208833?utm_source=gb-gplus-share專利 US6208833 - Echo cancellation for a broadband distribution system
