in reply to Re^4: utf8 hash keys revisited: How can i use musical symbols as hash keys?
in thread utf8 hash keys revisited: How can i use musical symbols as hash keys?

I think the original Helmholtz Notation for 440Hz/MIDI #69 is a′.

Just a variation of this kind of notation is ač.

In Scientific Pitch Notation this is A₄.

"It is designated A₄ in scientific pitch notation because of the note's position as the fourth A key on a standard 88-key piano keyboard. On MIDI, it is note 69."

Source

And Jim wrote: ač,0,69,440.0000000000.

Best regard, Karl

«The Crux of the Biscuit is the Apostrophe»

  • Comment on Re^5: utf8 hash keys revisited: How can i use musical symbols as hash keys?

In Section Seekers of Perl Wisdom