[ntp:questions] Using NTP to calibrate sound app

David Taylor david-taylor at blueyonder.co.uk.invalid
Sun Jan 27 20:31:38 UTC 2013

On 27/01/2013 19:33, unruh wrote:
> On 2013-01-27, no-one at no-place.org <no-one at no-place.org> 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.
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