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A good option for timing function for such signal happens to be the canonical $(a_k x_{k-1} - a_{k-1} x_k )$ with additional condition to calculate its value only when $a_k$ equals $a_{k-1}$ (i.e. when "1" is preceded by "1" or "-1" is preceded by "-1"). As a result, no additional digital filter is needed. The reason ...

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