[time-nuts] ANFSCD - Synchronizing time in home video recorders
bill at iaxs.net
Sun Feb 5 20:35:09 UTC 2012
Thanks for the info, Clint.
Seems like the only way to get my four Panasonic DVRs to synchronize
time is to analyze the I/O of the micro in the DVR, write interface
and HMI specs, and replace the micro with one that can talk to my
SNTP server. (Added two DVRs back when NASA was launching shuttles.)
This would have the added benefit of fixing the scheduling bugs and
make finalizing automatic for a full disk, rather than the five clicks
it takes now.
One day, the lack of sync every week will get to me, and I'll start
this project, but I don't think I'll live to finish it.
From: Clint Turner
Sent: Thursday, February 02, 2012 4:10 PM
-----%<----- Off subject stuff snipped
I, too, have an older (Philips) DVR that has lost its time sync since
the analogs went dark. For a while, I used the XDS time code that
happened to be in the vertical interval of one of its standard
definition DTV PBS station's sub-channels (received on a set-top box and
modulated onto a TV channel to which the DVR would "look" for its time
code) but this has code since been dropped.
Before I discovered this, I dug up the line 21 (IIRC) code
specifications and noted that even a PIC could probably generate the
proper code, synchronized either from a GPS or a WWVB receiver. I'd
thought about putting it on multiple lines and then RF modulating it for
the DVR to see, but lost enthusiasm after I discovered the time code on
the sub-channel. Since that went away (about a year ago) I've just
remembered to set the clock once a month, not being able to quickly find
the specs for the time code again online...
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