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Spectrums.md

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Spectrums (Spec)

We can extract a spectrum from the signal. It's an advanced type. The simplest function to create a spectrum is:

toSpec   :: Sig -> Spec
fromSpec :: Spec -> Sig
mapSpec  :: (Spec -> Spec) -> Sig -> Sig

With Spec we can apply spectral transformations to signal. we can create a vocoder effect with it for instance or scale a pitch or crossfade between several timbres.

We can interpolate between several signals:

cfdSpec :: Sig -> Spec -> Spec -> Spec
cfdSpec4 :: Sig -> Sig -> Spec -> Spec -> Spec -> Spec -> Spec
cfdsSpec :: [Sig] -> [Spec] -> Spec

To scale the pitch there are handy shortcuts:

scaleSpec :: Sig -> Sig -> Sig
scalePitch :: Sig -> Sig -> Sig

scaleSpec scales the frequency of the signal in Hz ratios but scalePitch does it in semitones.

If we have a spectrum we can process it with many functions from the module Spectral processing.