Midi to Frequency, Frequency to Midi, stolen from Puredata + freq to note name

gistfile1.cpp

float mtof(float f)
{
	return (8.17579891564 * exp(.0577622650 * f));
}

float ftom(float f)
{
	return (17.3123405046 * log(.12231220585 * f));
}



string freqToMidiString(float hz) {
	static char *names[12] = {"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"};
	int midinote = (int) ftom(hz);
	int note = midinote % 12;
	int octave = midinote / 12;
	octave -= 1;
	char name[5];
	sprintf(name, "%s%d", names[note], octave);

	string out = name;
	return out;
}