[streaming] Re: need to set up a US digital TV demo

[Jens Thomsen]

Jerry Scharf wrote:

> --On 08/09/2003 03:37:02 PM +0200 Tristan Leteurtre wrote:
>
>> On Sat, Aug 09, 2003, Benjamin PRACHT wrote:
>>
>>> Certainly  a  silly  question,  but aren't  US  terrestrial  
>>> digital  TV
>>> operators using a different standard than DVB (I thought it was the 
>>> case
>>> at leat for satellite digital TV)...
>>
>>
>> Well, as stated on
>> http://www.erg.abdn.ac.uk/public_html/research/future-net/digital-video/d 
>>
>> vb.html
>>
>>
>> "Milestones in DVB / MPEG-2
>> (...)
>> - 24th December 1996, U.S. Government adopts DTV as first step towards a
>> U.S. digital terrestrial network"
>>
>> So, the hauppauge nova-T should also be ok to received DVB US digital
>> terrestrial TV.
>>
>> -- 
>> Tristan
>> -- 
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>
> Tristan,
>
> I'm not so sure of this. ATSC is the group that defines US terrestrial 
> DTV. It uses MPEG2 but I think it uses QAM modulation unlike DVB. 
> Hauppauge makes different cards to receive DTV and DVB. My 
> understanding is that the boards are very close, so I may drop the $ 
> and buy one and try to figure out what I need to do to get it to work. 
> I know there is a driver that supports both, so that's very hopeful.
>
> Thank you so much for the info on not using the s-video outputs. You 
> mention some set top boxes. which ones do you know that would work 
> with VLS in this mode? I had ruled these out in my mind because I 
> assumed they would not work with local software. A set top box would 
> make the perfect demo.
>
> I'm out for a few days, but will get back to this as soon as I get 
> back in town.
>
> jerry
>
Jerry,

    I just wanted to clarify the modulation schemes for the list.  ATSC 
terrestrial uses 8VSB modulation, not QAM. QAM is a cable television 
modulation.  DVB-T (terrestrial) uses COFDM as it's modulation.

    Jens

-- 
Jens Thomsen
Software Engineer
Deep Magic Consulting



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