[linux-dvb] DVB-S2 and other (new) modulation standards

Johannes Stezenbach js at linuxtv.org
Wed Nov 23 18:45:09 CET 2005

On Wed, Nov 23, 2005, Steve Toth wrote:
> >>>Of course the current method used to distinguish the device
> >>>types in VDR (FE_QPSK = DVB-S, FE_QAM = DVB-C and FE_OFDM = DVB-T)
> >>>wouldn't work any more, so other criteria might be necessary.
> >>>But basically a DVB-S device would be just one single device
> >>>(with only one single frontend), whether it can only do the
> >>>"old" DVB-S, or both DVB-S and DVB-S2.
> >>>
> >>>At least that's how I would hope this would behave in the future.
> >>>      
> >>afaik dvb-s2 is backwards compatible to dvb-s 
> >>    
> Correct.
> For what it's worth, on the multiple frontend issue (not s2 related)... 
> A board will appear with some or all of the following features before 
> you know it. Analogue PAL, DVB-T and DVB-S on a single bridge. 
> Personally, it's more logical to me two have two different frontends, 
> one for S and one for T. Anything else feels like a hack.

Think of a frontend as a device which outputs an MPEG-2 TS.
The number of TSs you can receive simultaneously determines
the number of frontend devices.

> Analogue tends to take care of itself through v4l, this probably should 
> change longer term.

Analog and digital TV with one tuner is not optimally integrated, but
I don't think you should replace v4l with something else because of this.
There isn't that much left to do.


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