Andrea,
The watch or clock produces many sounds during its operation and the
issue is selecting the required one. As you wish to investigate the
timing function may I suggest that you incorporate some form of level
control to eliminate minor signals and allow only the strong sounds from
the escapement. You will find that even these will vary dependant upon
the amount of drop each pallet has and if it is in beat. It may be
interesting for you to have a look at the various watch timing machines
that are available and see if any ideas spring to mind.
I use a home-made system but various software and hardware solutions
exist such as http://home.teleport.com/~gregsa/clocks/wtm/index.htm and
http://www.delphelectronics.co.uk/products.html
Good luck with your experiments.
Peter
On 11/12/2015 18:44, Andrea Baldoni wrote:
Hello!
I decided to do some experiments with mechanical clocks, so I worked a little
on picking up escapement ticking sound, with the idea of processing it and
obtaining a "clean" digital pulse to feed a counter.
So far, I have not yet been able to find the best way to obtain a digital pulse,
but I have already built the preamp for the piezoelectrick pickup, that
I used to feed the mic input of a PC sound card for spectrum analysis.
The timing could eventually be done in software because the whole idea of
measuring watches by picking up their noise almost surely doesn't allow high
resolution anyway, but I will plan to try hardware solutions as well in the
future. I hope to be able to measure the jitter of the clock, but it will be
very hard.
In the meantime, with the free software Biburo you can download here
http://tokeiyade.michikusa.jp
you can regulate your wrist watch.
Best regards,
Andrea Baldoni
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