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FIR filter optimal design entry

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neoflash

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Hi:

It is stated in oppeheim's book that, if we know the exact location of "r" alternations, and we decided the number of taps of the filter, then we can settle the coefficients of the filter by solving linear equations.

My question is that how we know the exact locations of those alternations?

thanks,
Neoflash
 

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