hommage-0.0.5: Haskell Offline Music Manipulation And Generation EDSL Source code Contents Index

Sound.Hommage.Filter

Contents Filters FilterSpec FilterSpec and Lists Other Filterfunctions

Synopsis

lowpass :: [Double] -> [Double] -> [Double] highpass :: [Double] -> [Double] -> [Double] bandpass :: [Double] -> [Double] -> [Double] -> [Double] stretchpass :: FilterSpec -> [Double] -> [Double] morphpass :: FilterSpec -> FilterSpec -> [Double] -> [Double] type FilterSpec = [(Int, Double)] shiftFilterSpec :: Double -> FilterSpec -> FilterSpec filterSpecToList :: FilterSpec -> [Double] filterSpecsToLists :: [(Int, FilterSpec)] -> [[Double]] interpolFilterLists :: [Double] -> [Double] -> Double -> [Double] ffreq :: Double -> Double ffreqi :: Double -> Int average512 :: [Double] -> [Double] lowpassFS :: Double -> Double -> FilterSpec highpassFS :: Double -> Double -> FilterSpec bandpassFS :: Double -> Double -> Double -> FilterSpec lowp0FS :: Double -> FilterSpec lowp1FS :: Double -> FilterSpec bandp0FS :: Double -> FilterSpec bandp1FS :: Double -> FilterSpec highp0FS :: Double -> FilterSpec highp1FS :: Double -> FilterSpec

Filters

lowpass :: [Double] -> [Double] -> [Double] Source

highpass :: [Double] -> [Double] -> [Double] Source

bandpass :: [Double] -> [Double] -> [Double] -> [Double] Source

stretchpass :: FilterSpec -> [Double] -> [Double] Source

morphpass :: FilterSpec -> FilterSpec -> [Double] -> [Double] Source

FilterSpec

type FilterSpec = [(Int, Double)] Source

Filtering starts at coeff nr 0 and value 0.0 (constant coeff is always zero). The elements in FilterSpec define the next value and how many coeffs it takes to reach this value.

shiftFilterSpec :: Double -> FilterSpec -> FilterSpec Source

0..1: lower, 1..: higher

FilterSpec and Lists

filterSpecToList :: FilterSpec -> [Double] Source

Converting a FilterSpec to a list of 512 Doubles

filterSpecsToLists :: [(Int, FilterSpec)] -> [[Double]] Source

Converting and interpolating a sequence of FilterSpecs to a list of lists. The first elemet of the tuple, an Int, describes how many lists it takes to reach the given FilterSpec.

interpolFilterLists :: [Double] -> [Double] -> Double -> [Double] Source

Other

ffreq :: Double -> Double Source

for filter coefficient number: (0.0 .. 1.0) -> (1.0 .. 512.0)

ffreqi :: Double -> Int Source

floor of ffreq

average512 :: [Double] -> [Double] Source

the resulting list is 1 / 512 as long as the input list. 512 elements are read and their average is the next output value.

Filterfunctions

lowpassFS :: Double -> Double -> FilterSpec Source

highpassFS :: Double -> Double -> FilterSpec Source

bandpassFS Source

:: Double width of freq-window -> Double -> Double cutoff -> FilterSpec range, curve, cutoff

lowp0FS :: Double -> FilterSpec Source

lowp1FS :: Double -> FilterSpec Source

bandp0FS :: Double -> FilterSpec Source

bandp1FS :: Double -> FilterSpec Source

highp0FS :: Double -> FilterSpec Source

highp1FS :: Double -> FilterSpec Source

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