DSP.Filter.FIR.Sharpen

Module to sharpen FIR filters

Reference: Hamming, Sect 6.6

H'(z) = 3 * H(z)^2 - s * H(z)^3 = H(z)^2 * (3 - 2 * H(z))

Procedure:

1. Filter the signal once with H(z)
2. Double this
3. Subtract this from 3x
4. Filter this twice by H(z) or once by H(z)^2

Documentation

sharpen

Arguments

:: (Num a, Eq a)

=> Array Int a

h[n]

-> [a] -> [a]

function that implements the sharpened filter

Filter shaprening routine