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Approach is Good and it is working


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You can't design a filter that creates a phase shift that's constant with frequency for real valued input (if that's what you are trying to do). A Hilbert transformer appears to be doing this. However, the problem is, you can't implement a perfect Hilbert transformer since it's non causal with an infinite length impulse response. The tricky part is that ...


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I did use Differential Evolution to calculate the coefficients. But you can re-design the filter pair easily using the HIIR library by Laurent de Soras (its source code will automatically unzip to a subdirectory hiir). You can use this C++ HilbertDesign.cpp source and compile with g++ using the compile-command quoted on the first line: // -*- compile-...


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