I have a question about measuring precision of chromatic tuners.
I want to divide 2 cases.
If you check the link or this picture, it says that Korg AW-2G has the precision of +/- 1 cent.
What's the way or measurement to get this result (+/- 1 cent)?
There are people using Arduino (ATMEL328 MCU) with microphone or piezoelectric diaphragm for the ADC input.
One blog introduced the autocorrelation method for detecting the instrument's pitch. After calculating autocorrelation, using parabolic interpolation gives "accurate" results. (This is not sarcasm, don't get me wrong. :D)
Suppose I made a chromatic tuner using ATMEL328 and a piezoelectric diaphragm. Also, suppose I chose sampling rate 9240 Hz, 512 samples, the autocorrelation method (with parabolic interpolation).
In this case, how should I define the precision of this chromatic tuner? I can't buy tuning forks to compare the results. Let's suppose I'm testing with electrical guitar, classical guitar, and violin. So any ideas?
- Best Regards~