[opendtv] Re: NHK demos UHD TV broadcast
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 30 May 2006 01:03:59 -0400
But that is 19 MHz based upon what they can do now, using banked MPEG-2=20
encoders. You can likely cut that in half for AVC/VC-1 and then proceed =
to tune a bit over the years before this ever becomes real. I see no=20
reason to think we've come to the end of advances video compression=20
technology.
So I'm not sure it is all that improbable.
- Tom
Albert Manfredi wrote:
> What's interesting about this article is that they have gone beyond jus=
t the=20
> display issues related to UHD, and included questions of transmission. =
And=20
> to me, this scheme looks similar to the original HDTV schemes, HD-MAC a=
nd=20
> MUSE, because it needs to rely on a special UHD-only slice of spectrum.=
It=20
> is not likely that UHD broadcasts, which require 250 Mb/s compressed, w=
ill=20
> be able to coexist with more run of the mill TV spectrum allocations an=
ytime=20
> soon?
>=20
> For example, even if you postulate a signal-to-noise ratio as high as 4=
0 dB,=20
> which is achievable but hardly trivial, the narrowest channel width you=
can=20
> get by with would be 19 MHz. Never say never, but it does seem like a=20
> difficult proposition on a regular TV right-of-way.
>=20
> Bert
>=20
> --------------------------------
> NHK demos UHD TV broadcast
>=20
> Yoshiko Hara
> (05/26/2006 2:57 PM EDT)
> URL: http://www.eetimes.com/showArticle.jhtml?articleID=3D188500682
>=20
> TOKYO =97 NHK Science and Technical Research Laboratories has demonstra=
ted=20
> virtual satellite broadcasting of ultra-high definition (UHD) TV, which=
=20
> promises resolution 16 times higher than current high-definition images=
=2E
>=20
> NHK terms the technology as Super HiVision featuring 7680x4320 pixel=20
> resolution with progressive scanning at 60 frames per second. STRL, the=
=20
> central laboratory of Japan Broadcasting Corporation (NHK) showed off t=
he=20
> images at the NAB show held in Las Vegas last month, using fiber optic =
cable=20
> for transmission.
>=20
> Researchers brought the technology a step closer to reality by verifyin=
g=20
> signal transmission in a simulated satellite broadcasting and demonstra=
ting=20
> it at the lab's open house earlier this week.
>=20
> Japan is assigned with the 21-GHz band for future satellite broadcastin=
g. If=20
> UHDTV broadcasting were to begin, satellite broadcasting would be feasi=
ble=20
> due to availability of a wide bandwidth. The UHDTV signal was compresse=
d,=20
> modulated and went through an up-converter, then sent to an experimenta=
l=20
> 21-GHz-band satellite transponder that amplifies and relays signals on =
a=20
> satellite. The signal then passes through a down converter, where it is=
=20
> demodulated and decoded for display.
>=20
> NHK has not set the specifications for the next generation broadcasting=
=20
> system, but is using Super HiVision as the research base. Presently, th=
e=20
> data rate of Super HiVision baseband signal is 24 Gbits per second. Usi=
ng 16=20
> MPEG-2 encoding chips, the signal was compressed to 250 Mbits per secon=
d for=20
> transmission. HDTV signals at present are 1.5 Gbits per second for base=
band=20
> and 20 Mbit per second for compressed signals.
>=20
> In the experiment, the compression was dependent on MPEG-2. Lacking a=20
> single-chip solution, the researchers used four modulators to compress =
the=20
> audio and video signals in the experiment.
>=20
> Researchers plan to develop an optimum compression technology for Super=
=20
> HiVision and develop a higher performance modulator that can handle 300=
Mbps=20
> signals.
>=20
> All material on this site Copyright 2006 CMP Media LLC. All rights rese=
rved.
>=20
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>=20
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