OpenMusic Reference
f->mc
f->mc
(conversions module) -- converts frequencies in Hertz (Hz) to approximate midicent pitches
Syntax
f- >mc freq &optional approx ref-midic
Inputs
| name | data type(s) | comments |
|---|---|---|
| freq | a number or list thereof | the frequency or list of frequencies to convert |
| approx | a positive number | optional; the subdivision of the octave to use for the approximation; defaults to 2. Note that decimal values are allowed |
| ref-midic | an integer | optional; specifies a reference pitch, as a midic |
Output
| output | data type(s) | comments |
|---|---|---|
| first | a number or list thereof |
Description
This function accepts either a single frequency or a list of frequencies. They will be converted into their nearest approximation in midic values.
If the optional inputs are not used, the approximation will be as close as possible. If approx is used, they will be rounded off to their nearest note in an equal-tempered subdivision of the octave. The octave of 1200 midics will be subdivided into ( approx *6) equal parts, and the values will be rounded to these numbers. The default value of 2 for approx produces a traditional twelve-tone octave. 1 will produce a whole-tone, 6-step subdivision. 4 will produce a quarter-tone, 24-step division, and 8 will produce an eighth-tone, 48-step division of the octave. Other integers may be entered if desired do divide the octave in other ways.
The optional ref-midic input allows you to specify a reference pitch, in midics. This pitch will be subtracted from all the midics after they are converted from the frequencies, but before the approximation is performed, and the resulting midics will thus be relative to this midic.
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