|Originally posted by sowildpaul
It doesn't matter whether any equipment such as a STB or PVR has a built-in CC decoder or not as long as it's included in a TV (13in and larger) as required by law.
If your HD TV does not have a built in digital tuner, you will have to rely on the set top box for your CC. At that point screen size has nothing to do with it. All STB's MUST have the V-chip AND CC in them. The HD STB's WILL NOT PASS IT ON TO YOUR TV like an SD box. You will have to turn it on ON THE STB. TURNING IT ON YOUR HDTV WILL DO NOTHING in this case. If your STB is having trouble decoding CC, like some of the early Samsung's and Zenith's, your HDTV WILL NOT HAVE CC.
I know for a fact the Samsung SIR-T150's will not decode EIA708 CC if there is a EIA608 CC signal sent in a HD configuration along with the EIA708. I have been going round and round with Samsung on this issue for over a year now and they pretty much refuse to do anything about it. They say that model is no longer in production and they don't support it. If I want CC, buy a SIR T151 STB.
There are still transmit hardware CC issues as well. I am now in the middle of one such problem with the digital CC encoder and MPEG2 encoder manufacturers. When I have the digital CC encoder turned on, it will lock up the MPEG2 encoder so until the two manufacturers can figure out what is going on, I have no digital CC on air at the moment.
Unlike SD CC, in HD there is no "line 21" for the CC data to ride on. The CC is literally stripped out of the digital signal as a stream and then is routed around any aspect/up conventors and reinserted directly into the MPEG2 encoder.
This link can give you all the info you might need on digital CC and how it is done in the digital world that differs from the analog world.http://www.evertz.com/resources/eia_608_708_cc.pdfhttp://www.evertz.com/resources/cc_food_chain.pdf