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ntof

Convert note name to frequency

Plugin opcode in emugens.

It allows note name to include microtones or a deviation in cents.

Syntax

kfreq ntof Snote
ifreq ntof Snote

Performance

Snote -- Note name

kfreq -- Frequency

📝 Note

The frequency returned depends on the value of the global variable A4

📝 Note

4C is the central C in the piano.

Examples

Here is an example of the ntof opcode. It uses the file ntof.csd.

Example of the ntof opcode.
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<CsoundSynthesizer>
<CsOptions>
--nosound
</CsOptions>
<CsInstruments>

/*

Example for ntof: notename to frequency 

A notename is a string of the form

<octave><pitchclass>[cents]

Example notenames are:

"4A"     -> A in the 4th octave
"5C+31"  -> C5, 31 cents higher
"4Db-13" -> D flat, 4th octave, 13 cents lower
"7F#+"   -> F# quarter tone higher 
"5G-"    -> G5 a quarter tone lower

NB: the frequency returned by ntof depends on the value of A4

*/

A4 = 442

instr 1
    ifreq ntof "4A"
    print ifreq

    koctave = 1
    while (koctave <= 8) do
        Snote sprintfk "%dC", koctave
        kfreq ntof Snote
        printf "notename: %s  freq: %.2f \n", koctave, Snote, kfreq
        koctave += 1
    od

    turnoff
endin

</CsInstruments>
<CsScore>

i 1 0 1

</CsScore>
</CsoundSynthesizer>

See also

Pitch Converters: Functions

Midi Converters

Credits

By: Eduardo Moguillansky 2019

New in 6.13