[opendtv] Re: EBU backs emerging 1080p standard
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 26 May 2006 09:10:38 -0400
Mark Aitken wrote:
"However it may surprise some of you,"
> Laven told his hushed near-capacity audience, "to learn that stripped =
of
> the coding overhead associated with interlace, 1080p/50 actually needs=
a
> lower data rate than 1080i/50 to achieve the same subjective picture
> quality."
It would be nifty if this was proven by actually shipping cost effective =
gear that showed this. But both the i/p and the 50/60 are religious=20
issues I'm always afraid to tackle.
I think the interlace issue will slowly go away as fixed pixel display=20
technology comes to dominate. But there are only very marginal=20
improvements going from 720p->1080p or 50->60 Hz delivery.
Of all the holdouts I think it is the 24 Hz rate that annoys me the most.=
- Tom
> <*http://tinyurl.com/o8fep>*
> EBU backs emerging 1080p standard Print=20
> <http://tvbeurope.com/index2.php?option=3Dcom_content&task=3Dview&id=3D=
226&Itemid=3D46&pop=3D1&page=3D0#>=20
>=20
>=20
> Thursday, 25 May 2006
> While to many the issue of an interlace versus a progressive-scan HDTV =
> standard had taken on the entrenched fervour of a religious debate, EBU=
=20
> technical director Phil Laven said at last week's HD Masters conference=
=20
> in London that there is no need for a format war in Europe as all the=20
> HD-Ready sets are standards-agile, writes Richard Dean.
>=20
> However Laven left no doubt about the EBU's preference at the packed HD=
=20
> Masters conference, organised by TVBEurope in partnership with BKSTS an=
d=20
> SMPTE. "Tests have shown that viewers see little difference between=20
> uncompressed 720p and 1080i pictures, but prefer 720p on compressed=20
> signals," said Laven, pointing out that for the foreseeable future=20
> viewers will never see uncompressed pictures at home. "So 720p offers=20
> broadcasters better quality at the same rate, or the same quality at a =
> lower rate, perhaps making way for more channels.
>=20
> "Interlace is an old but effective technique for bandwidth reduction=20
> dating back to the 1930s, but modern compression techniques are more=20
> efficient," added Laven, hammering the point home. "Although converting=
=20
> from progressively scanned footage into final interlaced broadcast is=20
> easy and accurate, converting in the opposite direction creates errors =
> and approximations, so we believe that interlace should be avoided=20
> anywhere in the chain.
>=20
> "The EBU position is that the emission standard should be progressive -=
=20
> 720p/50 now, and 1080p/50 in the longer term."
>=20
> Heralding 1080p as the 'third generation HD standard' from which 720p=20
> and 1080i formats can be easily derived if required, Laven conceded tha=
t=20
> the format consumes a mighty 3 Gbps of bandwidth at full quality. SMPTE=
=20
> is working on a new standard for both 1080p/50 and 1080p/60 in the US, =
> with the likelihood of 1.5 Gbps 'mezzanine' compression variants for=20
> existing HD SDI infrastructure. "However it may surprise some of you," =
> Laven told his hushed near-capacity audience, "to learn that stripped o=
f=20
> the coding overhead associated with interlace, 1080p/50 actually needs =
a=20
> lower data rate than 1080i/50 to achieve the same subjective picture=20
> quality."
>=20
> Far from closing down the religious divide on picture scan formats,=20
> Laven's claims seem likely to give the topic a whole new lease of life.=
>=20
> =BB www.hdmastersconference.com <http://www.hdmastersconference.com>
>=20
> Close Window <javascript:window.close();>
>=20
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