Originally Posted by e-mail thread with CBS4 Denver engineer
Hi, thanks a million for the reply!
Yes, the DTVpal plus manual refers to having a TVGOS device control it to scan channels, etc., and I'm using it a bit differently by connecting directly to my HDTV's analog RF input and putting it in "TVGOS mode" where it stays locked onto your DTV transmission coming in to my TV on analog channel 3.
Myself and others on the AVS forums hope "special" TVGOS data can be converted back to analog VBI by a capable converter box then ultimately read by the older TVGOS systems. I've only read one success story so far (from Minneapolis), and perhaps it's because Macrovision's waiting until the analog transition is complete to roll out nationwide?
The Macrovision document I read is called "Delivering Data to TV Guide Consumer Electronic Devices" and it appears to be aimed more at the cable companies then broadcasters. The document refers to a device (perhaps supplied by Macrovision?) called a Norpak TES8 data encoder that inserts TVGOS data into SCTE 127-compatible ATSC transport streams.
Here's the paragraph for broadcasters from that document:
TV Guide Broadcasting partners use a Norpak TES8 data encoder to encode the three data streams within their ATSC broadcast. In most cases TV Guide has ensured that these data streams are included in all output paths, including the over-the-air ATSC broadcast as well as fiber feeds to cable operators. This encoding equipment receives data that is generated daily by TV Guide servers and sent over a secure VPN connection.
A single broadcaster in each market transmits data supporting all CE Guides and all available lineups in that market. Contact CE Broadcast Operations to determine the host station for a specific broadcast market."
I'm thinking since this is a Macrovision service, they'd have more information about their plans, but they've been unresponsive so far.
If this helps in anyway please advise, and thanks again for the reply!
On Mar 19, 2009, at 5:58 PM, ... station engineer ... wrote:
Thank you for your message.
As of this writing, there appears to be no solution available to do
what you ask.
We do not have a DTVpal device on hand here and can only go by what we
read in its manual. The manual describes how it can command some
devices to record, but it cannot load them with on screen data.
Reading I have done today seems to tell me that the TVGOS stream added
to our atsc signal complies with SCTE127, but I have not been able to
identify a device available to home users that will downconvert our atsc
signal into NTSC and insert the TVGOS data into that vertical interval.
Hoping you might be able to let me know if/when I might be able to get
my analog TVGOS data (the Gemstar/Macrovision technology) to start
working again via CBS/KCNC and a DTVpal plus converter box?
I've been doing some research about receiving 'digital' TVGOS data
because my 2005 Sharp AQUOS was no longer working after canceling cable
and going over-the-air only a few weeks ago. TVGOS data was coming in
via PBS analog channel 6 but it is just too snowy now for me to get
reliable data with my antenna and it will be going away completely after
June 12th at any rate.
In reading posts from some very knowledgeable people on the AVS Forums,
I learned about how Macrovision plans to maintain backwards
compatibility with analog TVGOS via formally adopted standard SCTE 127,
?The Carriage of Vertical Blanking Interval (VBI) Data in North American
Digital Television Bitstreams?. I understand (hopefully correctly?)
there has to be a few devices in place at the local broadcaster end to
insert TVGOS data into a digital broadcast which can then be converted
back into analog VBI lines by a DTV converter box such as the Echostar
I wanted to ask KCNC station engineering and/or management if/when CBS4
Denver plans to send TVGOS data using the relevant SCTE 127 devices? I
have gotten used to TVGOS and would really like to be able to start
using it again.
Thanks in advance for any insight you may have about this topic.