OT: Composite/Component [was Re: [mythtv-users] Re: Image quality, what effects it?]

Rudy Zijlstra mythtv at edsons.demon.nl
Sat Aug 14 16:43:18 EDT 2004

Cory Papenfuss wrote:

> I suspect that terrestrial cable will use encrypted QAM with cablecard 
> anyway, so getting uncrypted QAM support is probably moot.
No such thing exists...
terrestrial == over the air, which is in USA by ATSC 8-VSB, in normal 
thinking countries by DVB-T.
cable == by RF cable managed by a Cable Operator (Fox, UGC, ... )


P.S. ATSC is much later than DVB, and very much exists because the USA 
wanted to define its own standard, even though both Cable as well as 
Satellite in the USA were already very succesfully deploying DVB....

The argument that ATSC supports HD and DVB does not is not valid. DVB 
supports any level, and HD is simply HL at HP. ATSC simply mandates a 
number of resolutions. And fixing that particular table happened to be 
quit a fight.

P.P.S. DVB supports what is historically called FTA or Free To Air 
signals. Many Satellite signals are not encrypted. On cable the 
situation is very much defined by the operator, and strongly dependent 
on the business model.

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