Have there ever been any indications that E-VSB will be used by anyone at all for any purpose? - Tom John Shutt wrote: > Bert, > > The correct terms are 1/2 rate and 1/4 rate, not 1/2 additional FEC. > http://www.atsc.org/standards/a_53c_amend-1_corr-1.pdf > > As you correctly state, at 1/2 rate, for 542 Kbps, you get 18.1 Mbps in the > main stream. You removed 1.3 Mbps from the main stream to get 542 Kbps in > the robust stream. lose 2 bits to gain 1 bit. > > For 1/4 rate it's even worse. To achieve 542 Kbps robust, you get 16.9 Mbps > main stream. You removed 2.5 Mbps from the main stream to get 542 Kbps for > the robust stream. You lose 4.5 bits to gain 1 bit. > > As I understand it, with DVB-H, as implemented within a 6 MHz DVB-T stream > (as opposed to a > dedicated 5 MHz DVB-H carrier as Crown Castle is planning in the US), the > DVB-H data is time sliced within the DVB-T bitesream, and is a straight > one-for-one bit usage. The DVB-H data includes additional FEC, so for your > 542 Kbps you may need to use 25% more bitrate for the additional FEC data. > So you lose 677 Kbps from the main stream for a single DVB-H payload of 542 > Kbps. > > http://webapp.etsi.org/exchangefolder/en_302304v010101p.pdf > http://www.dvb.org/documents/DVB-H_Outline.pdf > > And I hate to point this out, but E-VSB may not even work very well. E-VSB > was designed to improve reception, but not to increase battery life of a > portable device. DVB-H is first and foremost a standard to save battery > power. > > John > > ----- Original Message ----- > From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx> > To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx> > Sent: Tuesday, March 29, 2005 6:33 PM > Subject: [opendtv] Re: TI Exec: Open Standards Crucial for Mobile TV > > >>Here's the E-VSB side. Maybe you can enlighten us on the >>equivalent DVB-T/DVB-H tradeoff? >> >>I'm just picking two values of robust stream, and the >>wide stream is supposed to be as robust as it is when >>the entire band is wide stream. >> >>For 542 Kb/s robust stream using 1/2 additional FEC, >>wide stream (2/3 FEC) is 18.1 Mb/s >> >>For 542 Kb/s robust stream using 1/4 additional FEC, >>wide stream (2/3 FEC) is 16.9 Mb/s > > > > > > ---------------------------------------------------------------------- > You can UNSUBSCRIBE from the OpenDTV list in two ways: > > - Using the UNSUBSCRIBE command in your user configuration settings at > FreeLists.org > > - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word > unsubscribe in the subject line. > > ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.