They said it was with respect to A-VSB. Of course, we all await technical details of MPH.
TTFN, Mark Allen Le Roy Limberg wrote:
Since A-VSB uses turbo coding, which supposedly can approach the Shannon limit very closely, I presume that the 7 DB improvement must be with regard to ordinary 8VSB or possibly E-VSB. Al Limberg----- Original Message ----- From: "Mark Schubin" <tvmark@xxxxxxxxxxxxx>To: <opendtv@xxxxxxxxxxxxx> Sent: Tuesday, April 10, 2007 10:11 PM Subject: [opendtv] Re: U.S. mobile TV spec in the worksMPH is, according to Harris, 7 dB more robust than A-VSB with half the bit-rate penalty. TTFN, Mark John Shutt wrote:----- Original Message ----- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>Nothing magic. Some time ago I suggested that maybe one could transmit several streams of the same program, each one interleaved differently, as done for turbo coded transmissions. The receivers set up for this decode one robust stream. Existing receivers would be able to demodulate one of the streams, potentially, if one of these streams was set up like standard 8-VSB.Butexisting receivers would not be able to demod the other(s), due to the different inner interleaver. This would be what I consider "backward compatible," although it may not be as robust as alternatives.Exactly what I said, Bert. A scheme that doesn't break existing receivers, but doesn't confer any new robust receive capabilities to existing receivers. Just reduces the amount of payload existing receivers can see and decode. John. ---------------------------------------------------------------------- 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 atFreeLists.org- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the wordunsubscribe 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.
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