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] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
