| Reconstruction From Zero Crossings |
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This problem has 2 parts. Firstly proving that there is a unique reconstruction of the signal from the zero crossings and secondly how to actually go about reconstructing the signal. Though there have been quite a few attempts before, no conclusive solution has been found. Ben Logan from the Bell Laboratories wrote a paper in 1977 in the ''Bell Systems Technical Journal'' giving some criteria under which unique reconstruction is possible. Though this has been a major step towards the solution, many people are dissatisfied with the type of condition which results from his paper. According to Logan a signal is uniquely reconstructible from its zero crossings if: #The signal x(t) and its Hilbert Transform xt have no zeros in common with each other. #The frequency domain representation of the signal is at most 1 Octave long, in other words, it is Bandpass - Limited between some B and 2B. FURTHER READING
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