04-05-2020, 12:37 AM
At minimum I need an accuracy of 1 cent. A cent is the number of Hertz you get by dividing the distance between one note on the piano and the next (half-tone step) by 100 equally spaced steps. So a cent is the length of one of those steps.
Here are the frequencies for each key of the piano for reference: https://en.wikipedia.org/wiki/Piano_key_frequencies
Because the frequency differences of low keys are quite small (down to approximately 2 Hz) the accuracy has to be 0.02 Hz...
Fortunately this is the extrem worst case and the distance between the keys is growing faster and faster for higher and higher keys, I need an accuracy of 0.25 Hz for a key in the middle (A4=440 Hz here) and an accuracy of 2.35 Hz for the highest key (C8=4186Hz).
Do you see any chance for the measurement in the lower third of the piano? (Recording with a cellphone microphone, I should further mention)
Here are the frequencies for each key of the piano for reference: https://en.wikipedia.org/wiki/Piano_key_frequencies
Because the frequency differences of low keys are quite small (down to approximately 2 Hz) the accuracy has to be 0.02 Hz...
Fortunately this is the extrem worst case and the distance between the keys is growing faster and faster for higher and higher keys, I need an accuracy of 0.25 Hz for a key in the middle (A4=440 Hz here) and an accuracy of 2.35 Hz for the highest key (C8=4186Hz).
Do you see any chance for the measurement in the lower third of the piano? (Recording with a cellphone microphone, I should further mention)