Hi Consider a case where the clocks and signals are all clean and stable:
Both are within 2.5 ppb of an integer relationship. ( let’s say one is 10 MHz and the other is 400 MHz ). The amount of information in your data stream collapses. Over a 1 second period, you get a bit better than 9 digits per second. Put another way, the data set is the same regardless of where you are in the 2.5 ppb “space”. Bob > On Apr 27, 2018, at 5:30 AM, Hal Murray <hmur...@megapathdsl.net> wrote: > > > olegsky...@gmail.com said: >> No, it is much simpler. The hardware saves time-stamps to the memory at each >> (event) rise of the input signal (let's consider we have digital logic input >> signal for simplicity). So after some time we have many pairs of {event >> number, time-stamp}. We can plot those pairs with event number on X-axis and >> time on Y-axis, now if we fit the line on that dataset the inverse slope of >> the line will correspond to the estimated frequency. > > I like it. Thanks. > > If you flip the X-Y axis, then you don't have to invert the slope. > > That might be an interesting way to analyze TICC data. It would work > better/faster if you used a custom divider to trigger the TICC as fast as it > can print rather than using the typical PPS. > > ------ > > Another way to look at things is that you have a fast 1 bit A/D. > > If you need results in a second, FFTing that might fit into memory. (Or you > could rent a big-memory cloud server. A quick sample found 128GB for > $1/hour.) That's with 1 second of data. I don't know how long it would take > to process. > > What's the clock frequency? Handwave. At 1 GHz, 1 second of samples fits > into a 4 byte integer even if all the energy ends up in one bin. 4 bytes, *2 > for complex, *2 for input and output is 16 GB. > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.