| http://www.w3.org/ns/prov#value | - The system of claim 16 wherein said synchronization symbols comprise two-level symbols and said data symbols comprise N-level symbols, where N is an integer greater than or equal to 4, said filter producing an output two-level synchronization symbol in response to each received two-level synchronization symbol and an output M-level data symbol, where M is an integer greater than N, in response to
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