On 27/01/2013 19:33, unruh wrote:
On 2013-01-27, [email protected] <[email protected]> wrote:
[]
In case you are wondering, my app is a professional piano tuning app.
The standard in this industry is that tuning devices should be
accurate to 12 parts per million. I know that is probably overkill
for tuning pianos, but that is what the professionals expect from
their equipment.
Ah. I would expect 1 cent, which is more like 500PPM.
1% (10,000 ppm) is a 4.4 cycles per second beat at 440 Hz! Completely
unacceptable. You want an imperceptible beat, ideally, well under 1 Hz.
Agreed that 12 ppm is overkill.
--
Cheers,
David
Web: http://www.satsignal.eu
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