[linux-dvb] Re: dec2000-t success

[Douglas Kosovic <douglask@dstc.edu.au>]

Edward Wildgoose wrote:

> > the DEC 2000-t's USB 1.1 interface will impose a 12 Mbits/s limit on
> > its USB->PC interface.  I do not know the maximum (compressed)
> > throughput that can be required by a 7 MHz, DVB-T transport stream
> > (23 Mbits/s?), but I suspect that it does exceed 12 Mbits/s.
> > If true, this would impose an unfortunate limitation on the DEC 2000-t.
> > (USB 2.x at 480 Mbits/s would have avoided this...)
> >    
> I am under the impression that because Australia is using QAM64 (which I
> think means more channels per transport stream) you should find that the
> channels have a lower max transmission than 23Mbits/s.  In the UK I think
> the QAM64 channels are 6Mbit/s.
>  
I don't know about the calculations based on QAM64, but the Australian
HDTV 1080i broadcasts are approx 4 times the resolution of SDTV 576i,
so I would expect something like 4 times the bandwidth would be required.
From memory, I think it's 19 Mbit/s, but I could be wrong.

I wonder if the Australian DVB-T 720P HDTV broadcasts exceed the 12 Mbits/s
USB 1.1 limit? I would imagine the bandwidth for 576p broadcasts wouldn't
be a problem, but it would be interesting to see if the built in decoder
can handle 576p.

At least the Australian SDTV 576i channels which are 6 Mbit/s, should work.

Doug.




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