On 30/05/2012 8:57 AM, scott wrote:
>
> There is no reason for a tablet (or any PC/phone) to have a clock
> generator with super accuracy, it's simply wasted expense when an
> accuracy of <1% will do for the majority of tasks.  That's why
> professional sound cards have an option to use the clock from an
> incoming signal (rather than the internal one) to keep everything in sync.
>

It was a NTB (Not Too Bright) idea, a eureka moment where I slipped on 
the soap when I jumped out of the bath etc.

the software I have will only find the beats to a resolution of 1 

is very noisy and automatically finding the beats is not very accurate.


> Try playing the same song (or your tick recording) on several different
> devices at the same time, you'll find they likely drift apart noticeably
> after only a minute or two.
>

I am sure that they would.

> You could try recording the speaking clock as a reference, that is
> probably more accurate than your tablet.

I was using the tablet as a recording device. It is the accuracy of that 
which is in doubt. Well it is not actually in doubt, it is not up to the 
requirements needed.
My quartz watch was for calibrating/adjusting the figures I got after 
analysing the wave form. But the time between ticks is not constant. The 
recording program and the sound card probably have too low a priority 
for accurate recording. Which is also an answer to Andrew saying that 
cheap quartz oscillators are quite accurate. That and the compensation 
for voltage and temperature won't be high spec.

* An accuracy of about +/- 7 minutes a day.


-- 
Regards
     Stephen

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