[time-nuts] IRIG-B audio decoder circuits and ICs sought

Tim Shoppa tshoppa at gmail.com
Tue May 19 16:37:58 EDT 2015


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 <joegwinn at comcast.net> 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
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