This is incredibly close to the 699Hz of F5, so at least I'm glad I didn't think that was too far out of tune! Secondly, the striking flatness I heard in the second row's lower tone is much subtler than imagined – a difference of only 14Hz! This is somewhat surprising and I'm not sure why that difference jumped out to me so much more than that of the leftmost column's higher tone.įinally, the top row's lower tone is in reality 697Hz. This is 34Hz sharp of the 1175Hz of a Western D6, or about 48 cents* – so I'm not surprised I noticed it! I resorted to Wikipedia to see if my three observations were reasonable.įirstly, the leftmost column's higher tone is 1209Hz. However, the lower tone of the top row did sound almost indistinguishable from a real equal-temperament F5. Even more strikingly, the lower note I decided was closest to a G5 (for the second row) sounded incredibly flat, and I nearly decided it was closer to an F♯5. For instance, the higher tone corresponding to the leftmost column seems somewhat sharp compared to a Western D6. While working out these approximations, I was very aware of some notes that were particularly far from the equal-tempered western scale. Here are the notes I approximated for each row on the keypad:įor each row on the keypad, the lower pitch rises moving downwards and for each column the higher pitch rises moving right. Using a MIDI keyboard and some synthesizer software, I configured a polyphonic synthesizer to play a simple unfiltered sine wave for each note pressed. To test my ears, I tried to work out the pitches each key made. The most interesting thing to me was that the tones weren't using equal temperament – i.e., they wouldn't line up perfectly with notes on a piano or guitar. The tones aren't using equal temperament.The unique sound is made up of two pitches.Here's what I managed to work out just by ear:
I've always been interested in phone keypad sounds, so I tried to replicate them.
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