[opendtv] Re: ATSC Mobile DTV
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 6 Jan 2009 12:51:32 -0800
Your terminology is of course, vague. It's how you multiplex legacy MPEG-2
material with content that is incompatible, in a transmission channel.
It ain't simple. First you use only three elements from MPEG-2; sync_byte
(and the distributed processing sync_byte scheme as well), pid and 188-byte
packets.
However, you have to employ two processing chains, and you have to do about
four levels of preprocessing (crc, sccc, pccc, etc) AFTER decidng which
components (mpeg-2 term: elementary streams) go into which group, and which
parade(s) are present in which 968-ms period of time.
Not to gloss over the construction of the FIC dynamically, as well as the
TPC, both of which are much more dynamic than anything in MPEG-2 (mandatory
"next" data, is just one example), and have everything match up with the
SMT, GAT, CIT, etc.
By the way, bert, 'your' cell information table is optional, in the sense
that it's only used in distributed transmissions, which are unlikely to be
common for a while.
"Real simple" only to people who don't understand it much and who don't need
to ever effectuate anything they do in code. I'm finding construction of a
new TPC 5x every 968 ms to be "interesting."
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Manfredi, Albert E
Enviado el: Tuesday, January 06, 2009 12:39 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: ATSC Mobile DTV
Ron Economos wrote:
> "The packet formatter next shall replace the 3-byte MPEG header
> place holder with an MPEG header having an MHE packet PID."
Of course.
How else can one mix legacy ATSC and M/H in the same digital channel?
This is pretty basic stuff.
Bert
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