[linux-dvb] Re: Types and capabilites for HDTV ATSC.

[Johannes Stezenbach <js@convergence.de>]

Holger Waechtler wrote:
> Mac Michaels wrote:
> >I am the owner of a FunsionHDTV 3 Gold card. I have the 
> >analog TV and audio working with my modificatons to the 
> >CX88 driver. I am working on the Digital TV (HDTV ATSC) and 
> >want to integrate it into DVB as I seems to be a good fit. 
> >The FusionHDTV card produces a transport stream that seems 
> >to fit well with DVB. I found Chris Pascoe's modifications 
> >to the cx88 driver and plan to adapt them for my card. The 
> >LGDT3302 frontend provides some of the signal quality data 
> >the other DVB demodulators provide. It tunes the same 
> >physical frequency bands as U.S. analog TV.
> >
> >I am not sure which fe_type I should use for the driver. 
> >FE_QAM seems appropriate for QAM 64/256 that is supported 
> >by the card. What existing or new type is ATSC HDTV? Does 
> >the driver register 2 interfaces, one for each type?
> 
> I'd propose FE_ATSC because it's not straight QAM but QAM encapsulated 
> in 8VSB -- similiar to the DVB-T/OFDM demods which encapsulate a QPSK or 
> QAM modulation in a OFDM multiplexing scheme.

That's what I would do, too.

BTW, Christopher Pascoe mailed me privately (in response to the
Hauppauge cx88 Nova driver announcement), so maybe there's
a new driver coming soon...

> >I think a new fe_caps may be needed for 8VSB ATSC. How 
> >about:
> >
> >FE_CAN_VSB_8

I would prefer FE_CAN_8VSB.

> >For fe_type FE_QAM the fe_caps should probably be
> >
> >FE_CAN_QAM_64 | FE_QAM_256
> 
> sounds good.

Yep.

Johannes