ntof
ntof — Convert note name to frequency
Description
Plugin opcode in emugens.
Convert note name to frequency (Hz). It allows note name to include microtones or a deviation in cents.
Performance
Snote -- Note name
kfreq -- Frequency
![[Note]](images/note.png)
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The frequency returned depends on the value of the global variable A4 |
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4C is the central C in the piano. |
Examples
Here is an example of the ntof opcode. It uses the file ntof.csd.
Example 671. Example of the ntof opcode.
<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>