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- # Musical note frequencies in the 12 equal temperament system
- let frequency_A4: Frequency = 440 Hz # the A above middle C, A4
- fn note_frequency(n: Scalar) -> Frequency = frequency_A4 * 2^(n / 12)
- print(note_frequency(12)) # one octave higher up (A5), 880 Hz
- print(note_frequency(7)) # E4
- print(note_frequency(-3)) # C4
- assert_eq(note_frequency(12), 2 * frequency_A4)
- assert_eq(note_frequency(7), 659.255 Hz, 1 mHz)
- assert_eq(note_frequency(-3), 369.994 Hz, 1 mHz)
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