|Originally posted by patriot76
So lets say CSI on CBS is recorded by the local station in HD format.
What kind of equipment do they use to record it and then later re-transmit it at the appropriately scheduled broadcast time?
CBS for example transmits MPEG2 at 45mbs over satellite or standard DS3 phone lines. The station has equipment to convert this back into standard SMPTE292 HD digital video. That is a serial signal at 1.5gbs (gigabits per second). Broadcast VTR's and Disk recorders (servers) can accept this signal and record it, with the exception of a few units in a re-compressed DCT form. Recording HDTV at uncompressed rates is very expensive. Either a LOT of disk space or use of a D6 VTR with raw tape at $400 per hour.
They then simply play it back through thier ATSC encoder. It is also possible to record the native 45mbs stream on a server and play that back through a re-encoder to ATSC though no hardware exists that I am aware of.
Can you buy this equipment and record HDTV off a DBS receiver's analog HDTV out. Yes you can, it's a free market.
HDTV VTR starting at $50,000
conversion device analog HDTV to SMPTE292 - $5000 to 10,000
conversion device SMPTE to analog HDTV for playback $2500
Audio? (assumes an HDTV vtr with 8 channels)
TAPE? starting at about $70 per hour.
So go for it. This is why image constraint is veiwed as such a joke by those in the broadcast business. But the price of this stuff will decrease over the next few years. But by that time consumer analog HDTV can be phased out as well.