 | dsp-0.1: Haskell Digital Signal Processing | Contents | Index |
| 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:
- 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
| sharpen :: Num a => Array Int a -> ([a] -> [a]) |
| :: Num a | |
| => Array Int a | h[n] |
| -> ([a] -> [a]) | function that implements the sharpened filter |
| Filter shaprening routine | |