| http://www.w3.org/ns/prov#value | - A system for detecting the presence of an information bit stream in a data signal, said bit stream being synchronous to a clock signal and at submultiple frequencies thereof, the highest submultiple at 1/2 clock frequency and the lowest submultiple at 1/N clock frequency, where N is an integer, the system comprising:quadrature detection means for processing the clock signal and data signal and pro
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