[opendtv] Re: NHK demos UHD TV broadcast
- From: "Barry Wilkins" <barry.barrywilkins@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 30 May 2006 08:25:32 +1200
Could somebody explain how they managed to verify the superior image quality
using current display technology? What screens are available with that
degree of resolution? I take it that they are referring to a "TV" broadcast
application, not some kind of direct to cinema digital transmission
application.
Barry
On 5/30/06, Albert Manfredi <bert22306@xxxxxxxxxxx> wrote:
>
> What's interesting about this article is that they have gone beyond just
> the
> display issues related to UHD, and included questions of transmission. And
> to me, this scheme looks similar to the original HDTV schemes, HD-MAC and
> MUSE, because it needs to rely on a special UHD-only slice of spectrum. It
> is not likely that UHD broadcasts, which require 250 Mb/s compressed, will
> be able to coexist with more run of the mill TV spectrum allocations
> anytime
> soon?
>
> For example, even if you postulate a signal-to-noise ratio as high as 40
> dB,
> which is achievable but hardly trivial, the narrowest channel width you
> can
> get by with would be 19 MHz. Never say never, but it does seem like a
> difficult proposition on a regular TV right-of-way.
>
> Bert
>
> --------------------------------
> NHK demos UHD TV broadcast
>
> Yoshiko Hara
> (05/26/2006 2:57 PM EDT)
> URL: http://www.eetimes.com/showArticle.jhtml?articleID=188500682
>
> TOKYO ? NHK Science and Technical Research Laboratories has demonstrated
> virtual satellite broadcasting of ultra-high definition (UHD) TV, which
> promises resolution 16 times higher than current high-definition images.
>
> NHK terms the technology as Super HiVision featuring 7680x4320 pixel
> resolution with progressive scanning at 60 frames per second. STRL, the
> central laboratory of Japan Broadcasting Corporation (NHK) showed off the
> images at the NAB show held in Las Vegas last month, using fiber optic
> cable
> for transmission.
>
> Researchers brought the technology a step closer to reality by verifying
> signal transmission in a simulated satellite broadcasting and
> demonstrating
> it at the lab's open house earlier this week.
>
> Japan is assigned with the 21-GHz band for future satellite broadcasting.
> If
> UHDTV broadcasting were to begin, satellite broadcasting would be feasible
> due to availability of a wide bandwidth. The UHDTV signal was compressed,
> modulated and went through an up-converter, then sent to an experimental
> 21-GHz-band satellite transponder that amplifies and relays signals on a
> satellite. The signal then passes through a down converter, where it is
> demodulated and decoded for display.
>
> NHK has not set the specifications for the next generation broadcasting
> system, but is using Super HiVision as the research base. Presently, the
> data rate of Super HiVision baseband signal is 24 Gbits per second. Using
> 16
> MPEG-2 encoding chips, the signal was compressed to 250 Mbits per second
> for
> transmission. HDTV signals at present are 1.5 Gbits per second for
> baseband
> and 20 Mbit per second for compressed signals.
>
> In the experiment, the compression was dependent on MPEG-2. Lacking a
> single-chip solution, the researchers used four modulators to compress the
> audio and video signals in the experiment.
>
> Researchers plan to develop an optimum compression technology for Super
> HiVision and develop a higher performance modulator that can handle 300
> Mbps
> signals.
>
> All material on this site Copyright 2006 CMP Media LLC. All rights
> reserved.
>
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