Text 12865, 71 rader
Skriven 2006-09-06 21:57:26 av /m (1:379/45)
  Kommentar till text 12864 av Rich Gauszka (1:379/45)
Ärende: Re: wireless HDMI interface coming soon via ultrawideband?
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From: /m <mike@barkto.com>


Why introduce PCs into the mix?  Windows only complicates matters and reduces
the reliability of the overall system.

  /m

On Wed, 6 Sep 2006 21:36:50 -0400, "Rich Gauszka" <gauszka@hotmail.com> wrote:

>Being able to handle 3 or more HD streams at 30 feet sound good.
>Unfortunately I don't see any mention of the system being incorporated in
>PCs
>
>http://www.extremetech.com/article2/0,1558,2011975,00.asp?kc=ETRSS02129TX1K000
0532
>
>On Tuesday, Tzero Technologies and Analog Devices announced that they have
>created a wireless HDMI interface for HDTVs, next-gen DVD players, and
>set-top boxes.
>The companies' first wireless HDMI setup is a standards-based system,
>predicated on the standards set forth by Panasonic, Philips, Samsung, Sharp,
>and Sony in July of 2003. Other wireless HDMI technologies introduced to
>date have been proprietary, both Tzero and Analog Devices alleged.
>
>Wireless HDMI (high-definition multimedia interface) enables wireless video
>and audio connections between all types of home entertainment products such
>as HDTVs, DVD players, set-top boxes, and game systems. It allows HDMI
>content to stream to several devices without a tangle of wires. The backbone
>for the technology is ultrawideband, also used as a future replacement for
>wired USB.
>
>The standard calls for link reliability of at least 95 percent, packet error
>rate of less than 1 in one hundred million, interference resistances for
>microwaves and cordless phones, and the ability to process three or more HD
>streams at 10 meters.
>
>"The primary thing that is the most challenging is linked with reliability,"
>said Dan Karr, vice president of marketing for Tzero. "It needs to be good
>under all conditions. Wi-Fi serves this market very well, but in a video
>environment you can see that would be very problematic."
>
>The wireless HDMI system consists of a transmitter and receiver. The
>transmitter is a black box about the size of a laptop. Karr says that it is
>"bigger than necessary, and that's because it's new, but it will get
>smaller."
>
>The transmitter integrates the Tzero TZ7000 chipset and Analog Devices'
>JPEG2000 compression integrated circuits. The Analog Device compresses data
>with JPEG2000 video code, which is then packetized and encrypted, and
>transmitted via the Tzero MAC and PHY chip. The chip transmits over the air
>to the receiver where the audio/video data with HDMI is decompressed and
>presented to the display device via the HDMI port.
>
>JPEG 2000 is a relatively new image compression standard that was approved
>by the JPEG committee. It can operate at higher compression ratios without
>the characteristic blocky and blurry effects of the original JPEG standard.
>
>"We pass the video through the JPEG2000 and then pass the video and audio
>through the Tzero chip," said Bill Bucklen, director for the Advanced TV
>Segment with Analog Devices. "You can't compress a content-protected signal
>so we've built a repeater function and because we encrypt the link, it's
>like we've taken a repeater and put them on the other side of the room."
>
>
>
>
>

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