synthesizer-0.2: Audio signal processing coded in Haskell Source code Contents Index

Synthesizer.Filter.TwoWay

Synopsis

data Signal v = Signal { past :: [v] future :: [v] } take :: Int -> Signal v -> [v] zipSignalWith :: (a -> b -> c) -> Signal a -> Signal b -> Signal c origin :: C a => Signal a -> a ones :: C a => Signal a delay :: C v => Int -> Signal v -> Signal v delayPad :: v -> Int -> Signal v -> Signal v delayOpt :: (Eq v, C v) => Int -> Signal v -> Signal v delayOnce :: C v => Signal v -> Signal v delayPadOnce :: v -> Signal v -> Signal v delayOptOnce :: (Eq v, C v) => Signal v -> Signal v delayGen :: (Signal v -> Signal v) -> Int -> Signal v -> Signal v reverseTwoWay :: Signal v -> Signal v flipPair :: (a, b) -> (b, a) testDelayGen :: Signal Double nonRecursiveFilter :: C a v => [a] -> Signal v -> Signal v nonRecursiveFilterMod :: C a v => Signal [a] -> Signal v -> Signal v interpolatePaddedZero :: (Ord a, C a) => b -> T a b -> a -> Signal a -> Signal b -> Signal b interpolatePaddedCyclic :: (Ord a, C a) => T a b -> a -> Signal a -> Signal b -> Signal b interpolatePaddedExtrapolation :: (Ord a, C a) => T a b -> a -> Signal a -> Signal b -> Signal b interpolateCore :: (Ord a, C a) => T a b -> a -> Signal a -> Signal b -> Signal b interpolateHalfWay :: (Ord a, C a) => T a b -> a -> [a] -> Signal b -> [b] data T t a v = Mask [a] | ModMask (Signal [a]) | FracDelay (T t v) t | ModFracDelay (T t v) (Signal t) | Delay Int | Past [v]

Documentation

data Signal v Source

A TwoWay.Signal stores values of the past and the future Constructors Signal past :: [v] future :: [v] Instances Filter Signal T C a v => C a (Signal v) Eq v => Eq (Signal v) Show v => Show (Signal v) C v => C (Signal v)

take :: Int -> Signal v -> [v] Source

Take n values starting from time zero. If you want clips from elsewhere, call take after delay.

zipSignalWith :: (a -> b -> c) -> Signal a -> Signal b -> Signal c Source

origin :: C a => Signal a -> a Source

Take the value at time zero.

ones :: C a => Signal a Source

A signal that consists entirely of ones

delay :: C v => Int -> Signal v -> Signal v Source

shift signal in time, keep all values but if required pad with zeros

delayPad :: v -> Int -> Signal v -> Signal v Source

delayOpt :: (Eq v, C v) => Int -> Signal v -> Signal v Source

shift signal in time, zero values at either ends will be flushed

delayOnce :: C v => Signal v -> Signal v Source

Delay by one sample.

delayPadOnce :: v -> Signal v -> Signal v Source

delayOptOnce :: (Eq v, C v) => Signal v -> Signal v Source

delayGen :: (Signal v -> Signal v) -> Int -> Signal v -> Signal v Source

General routine that supports delaying and prefetching using a general one-sample delaying routine.

reverseTwoWay :: Signal v -> Signal v Source

flipPair :: (a, b) -> (b, a) Source

for a Signal this means a reversion of the elements

testDelayGen :: Signal Double Source

nonRecursiveFilter :: C a v => [a] -> Signal v -> Signal v Source

Unmodulated non-recursive filter

nonRecursiveFilterMod :: C a v => Signal [a] -> Signal v -> Signal v Source

Modulated non-recursive filter. The number of values before time 0 (past) or the filter mask lengths must be at most finite.

interpolatePaddedZero :: (Ord a, C a) => b -> T a b -> a -> Signal a -> Signal b -> Signal b Source

Interpolation allowing negative frequencies, but requires storage of all past values.

interpolatePaddedCyclic :: (Ord a, C a) => T a b -> a -> Signal a -> Signal b -> Signal b Source

interpolatePaddedExtrapolation :: (Ord a, C a) => T a b -> a -> Signal a -> Signal b -> Signal b Source

interpolateCore :: (Ord a, C a) => T a b -> a -> Signal a -> Signal b -> Signal b Source

interpolateHalfWay :: (Ord a, C a) => T a b -> a -> [a] -> Signal b -> [b] Source

data T t a v Source

Description of a basic filter that can be used in larger networks. Constructors Mask [a] A static filter described by its mask ModMask (Signal [a]) A modulated filter described by a list of masks FracDelay (T t v) t Delay the signal by a fractional amount of samples. This is achieved by interpolation. ModFracDelay (T t v) (Signal t) Delay with varying delay times. Delay Int Delay the signal by given amount of samples. Past [v] Replace the past by the given one. This must be present in each recursive filter cycle to let the magic work! Instances Filter Signal T

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