[ntp:questions] Confused about pool rotation

David Woolley david at ex.djwhome.demon.invalid
Thu Feb 7 08:10:44 UTC 2013

Robert Scott wrote:

> As I explained in another thread last week, my app is not a time app.
> It is a precision audio frequency measuring app.  The users of this
> app expect frequency accuracy on the order of 12 ppm.  To achieve this

I had previously assumed this was an electronic tuning fork, generating 
a reference sine wave for by ear tuning.  If it is measuring the 
frequency, the first problem is going to be defining what you mean by 
frequency.  In Fourier terms, the spectral width of a piano note is 
going to be more than 12ppm and depend on the exact interval over which 
you measure it.  I would also suspect that the zero crossing interval 
changes significantly during the note, particularly at the start.

>> I don't see how $300 can be considered low cost.
> It is quite simple.  There are no comparable apps to mine that cost
> less.  There are two comparable apps to mine that cost quite a bit
> more.

This sounds like pricing is based on hardware designs that haven't 
changed significantly in 30 years.

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