Hi Tim, On 03/31/2018 04:41 PM, Tim Shoppa wrote: > I would like sub-millisecond timestamps for a mono audio radio signal that > I have in the shack. > > The timestamps could be continuous (Every sample) or just every "frame" > where maybe a frame is a second to a minute. > > I would like to calibrate both the absolute time as well as the delta time > between samples based on the timestamps. (I would expect that say a nominal > 48kHz sample rate would be off by many tens of ppm because of crystal > tolerances.). > > I have a both Windows and Linux based PCs running Audacity with a local > GPS-based LAN refclock and ntpd. I trust the ntpd time to be stable to the > sub-millisecond. > > Can Audacity do this kind of timestamping for me based on the system clock? > > Or should I, say, take the PPS from a GPS, and feed it into channel 2, with > the audio going into channel 1, and make a stereo recording? I suppose I > could then manually label the filename with the second the recording was > begun. There would likely be some delta (maybe half the sample interval?) > between the two channels but I'm fine with that as long as it is at the > sub-millisecond level.
Have a IRIG-B signal recorded on the second track. IRIG-B has been decoded before, here is one I threw together: https://github.com/sa0mad/irigb You can readout the time for each sample. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
