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

[Holger Waechtler <holger@qanu.de>]

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.

> I think a new fe_caps may be needed for 8VSB ATSC. How 
> about:
>
> FE_CAN_VSB_8
>
> For fe_type FE_QAM the fe_caps should probably be
>
> FE_CAN_QAM_64 | FE_QAM_256
sounds good.

Holger