See for example the Truetime 820 decoder. Discriminators, One-shots, and Flip-Flops with pots to tweak the levels.
Tim N3QE On Tuesday, May 19, 2015, Joseph Gwinn <[email protected]> wrote: > I'm studying up on how IRIG-B decoder circuits work. What are the good > approaches, the bad approaches, especially in the presence of noise? > (I asked on the NTP group, with little result beyond the C/C++ decoder > software written for the audio channel of a 1990s Sun workstation, > which it ate alive: 50% cpu load.) > > Are there decoder ICs available? > > The closest to a decoder IC I've found is some FPGA code from a partner > of Microsemi (nee Symmetricom): > > ..< > http://www.microsemi.com/products/fpga-soc/design-resources/partners/semquest > > > > All marketing and little technical information. I'll have to find out > the details. > > > I find very little, though I did find one intriguing idea using a > Costas Loop to lock to the 1 KHz carrier, and a posting suggesting > squaring the input signal and phase-locking to the 2 KHz result. Most > recent articles on IRIG decoders come from Chinese sources, mostly in > the AC power industry. > > Joe Gwinn > _______________________________________________ > time-nuts mailing list -- [email protected] <javascript:;> > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ 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.
