On Wed, Jul 2, 2014 at 6:39 PM, John Van Ostrand john@vanostrand.com wrote: [...]
Also, Jeff, I considered that it might be interpolating depth to make 1 sec samples so I looked in the vendor's own software for an example of data where that couldn't have been the case. I found an example of a "W" shaped profile where the depth was up, down, up, down at 1 second intervals. I don't know how a two second sample rate and interpolation could produce that.
Maybe contents of the publication below could help? In the abstract they mention depth data recording every 1s (it is just a shot, I have no full access to it).
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=968236
Also, I can remember some publication by Thalmann (?) containing source code snippets for a dive computer software. Cannot find it now. :/
All the publications about US Navy dive computer link Cochran to Thalmann ideas about dive computers and decompression models (lawyers could disagree ;), i.e. see "Physiology and Medicine of Diving" (page 465-466 in my copy of the book, you can find older version of the chapter at [1], logical page 463). Also in [2]. Wikipedia might jump you into more publications.
It is all in the context of VVAL18 and whatever your dive computer uses now is newer, but I suspect the data logging scheme is probably very similar if not the same.
I hope above will not put you into a wrong direction.
[1] https://www.us.elsevierhealth.com/media/us/samplechapters/9780702025716/9780... [2] http://archive.rubicon-foundation.org/xmlui/bitstream/handle/123456789/10147...
[...]
Regards,
w