Seems broadcasters intend to use part of the spectrum for mobile and use MPEG4. If it is successful and/or if others using spectrum above 51 are successful broadcasters will be tempted to use more and more of their 6 MHz for mobile. Especially if few viewers are actually using 8-VSB for fixed reception which also might fit into broadcasters plans. Everything points to the broadcasters using most of their spectrum for mobile services IMO. I don't see anywhere that MPEG2 fits in their plans and therefor think that few will spend much time improving MPEG2. Bob Miller On Thu, Jun 19, 2008 at 3:31 PM, Manfredi, Albert E <albert.e.manfredi@xxxxxxxxxx> wrote: > Craig Birkmaier wrote: > > ----------------------------- > http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/76/27384/01218192. > pdf?temp=x > > Summary: This paper presents an overview of the transform and > quantization designs in H.264. Unlike the popular 8/spl times/8 discrete > cosine transform used in previous standards, the 4/spl times/4 > transforms in H.264 can be computed exactly in integer arithmetic, thus > avoiding inverse transform mismatch problems. The new transforms can > also be computed without multiplications, just additions and shifts, in > 16-bit arithmetic, thus minimizing computational complexity, especially > for low-end processors. By using short tables, the new quantization > formulas use multiplications but avoid divisions > ------------------------------ > >> So h.264 provides a significant improvement in arithmetic accuracy >> and the visibility of artifacts is reduced by acting upon smaller >> 4 x 4 regions of the image. > > Actually, you will not see that "accuracy" is improved mentioned > anywhere, but rather that computational complexity is reduced. An > integer transorm is not inherently more "accurate" at all, even if the > inverse doesn't introduce any additional error. And yes, the variable > block sizes will make blocking artifacts less obvious. > >> So my educated guess is that products like the Algolith device >> will not find their way into TV receivers. The shift to improved >> compression techniques will make this unnecessary. > > I don't buy your reasoning, Craig, because a shift to improved > compression techniques is not something a CE manufacturer can introduce > into his product all by himself. It requires a standards change and a > migration of the broadcast system. > > This box, very simply, can be used to extend the life of MPEG-2, both at > the transmission end and at the receive end. Whether it is hugely > successful or not is another matter. It took a whole lot of time to get > that point across. > > Bert > > > ---------------------------------------------------------------------- > 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.