# @coda/midi

# atodb

 atodb(source: Stream): Stream

The atob operator converts a stream of scalar or vector values from
amplitude to deciBels.

Parameter	Type	Default	Description
source	Stream		Input stream (amplitude values)

Returns Stream Scaled stream (dB values)

Example

db = now([0, 0.5, 1])
  .tap(x => console.log(`Amplitude: [${x}]`))
  .atodb()
  .tap(x => console.log(`deciBels: [${x}]`));

# dbtoa

 dbtoa(source: Stream): Stream

The dbtoa operator converts a stream of scalar or vector values from
deciBels to amplitude.

Parameter	Type	Default	Description
source	Stream		Input stream (dB values)

Returns Stream Scaled stream (amplitude values)

Example

a = now([0, -6, -Infinity])
  .tap(x => console.log(`deciBels: [${x}]`))
  .dbtoa()
  .tap(x => console.log(`Amplitude: [${x}]`));

# ftom

 ftom(source: Stream): Stream

The ftom operator converts a stream of scalar or vector values from frequency
to scale.

Parameter	Type	Default	Description
source	Stream		Input stream (frequency values)

Returns Stream Scaled stream (midi values)

# mtof

 mtof(source: Stream): Stream

The mtof operator converts a stream of scalar or vector values from midi
to frequency scale.

Parameter	Type	Default	Description
source	Stream		Input stream (midi values)

Returns Stream Scaled stream (frequency values)

# quantize

 quantize(options: Object, source: Stream): Stream

Quantize a scalar or vector stream to a given scale (chromatic by default).

see

https://github.com/danigb/tonal

Parameter	Type	Default	Description
options	Object	{}	WHAT ?????? ""
options.scale	Number	'chromatic'	Musical Scale (ex: 'C major')Available scales: aeolian, altered, augmented, augmented heptatonic, balinese, bebop, bebop dominant, bebop locrian, bebop major, bebop minor, chromatic, composite blues, diminished, dorian, dorian #4, double harmonic lydian, double harmonic major, egyptian, enigmatic, flamenco, flat six pentatonic, flat three pentatonic, harmonic major, harmonic minor, hirajoshi, hungarian major, hungarian minor, ichikosucho, in-sen, ionian augmented, ionian pentatonic, iwato, kafi raga, kumoijoshi, leading whole tone, locrian, locrian #2, locrian major, locrian pentatonic, lydian, lydian #5P pentatonic, lydian #9, lydian augmented, lydian diminished, lydian dominant, lydian dominant pentatonic, lydian minor, lydian pentatonic, major, major blues, major flat two pentatonic, major pentatonic, malkos raga, melodic minor, melodic minor fifth mode, melodic minor second mode, minor #7M pentatonic, minor bebop, minor blues, minor hexatonic, minor pentatonic, minor six diminished, minor six pentatonic, mixolydian, mixolydian pentatonic, mystery #1, neopolitan, neopolitan major, neopolitan major pentatonic, neopolitan minor, oriental, pelog, persian, phrygian, piongio, prometheus, prometheus neopolitan, purvi raga, ritusen, romanian minor, scriabin, six tone symmetric, spanish, spanish heptatonic, super locrian pentatonic, todi raga, vietnamese 1, vietnamese 2, whole tone, whole tone pentatonic
options.mode	Number	'round'	Quantization mode: 'round' selects the closest note, 'floor' the closest lower note, 'ceil' the closest higher note.
options.octavemin	Number	0	Minimum octave
options.octavemax	Number	10	Maximum octave
source	Stream		Input stream (~midi notes)

Returns Stream Quantized stream

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