Haskore.Basic.Pitch

Documentation

type T = (Octave, Class)

data Class

Constructors

Cf

C

Cs

Df

D

Ds

Ef

E

Es

Ff

F

Fs

Gf

G

Gs

Af

A

As

Bf

B

Bs

Instances

Enum Class

Eq Class

Ord Class

Read Class

Show Class

Ix Class

C Class

type Octave = Int

& code{(-3,A)} & 27.5 Hz \ $A_1$ & code{(-2,A)} & 55.0 Hz \ $A $ & code{(-1,A)} & 110.0 Hz \ $a $ & code{( 0,A)} & 220.0 Hz \ $a^1$ & code{( 1,A)} & 440.0 Hz \ $a^2$ & code{( 2,A)} & 880.0 Hz end{tabular} end{center} caption{Note names, Haskore representations and frequencies.} figlabel{note-freqs} end{figure}

Treating pitches simply as integers is useful in many settings, so let's also define some functions for converting between type{Pitch.T} values and type{Pitch.Absolute} values (integers): begin{haskelllisting}

type Absolute = Int

type Relative = Int

toInt :: T -> Absolute

fromInt :: Absolute -> T

classToInt :: Class -> Relative

classParse :: ReadS Class

classFormat :: Class -> ShowS

intToFreq :: Floating a => Absolute -> a

transpose :: Relative -> T -> T