Text 12864, 55 rader
Skriven 2006-09-06 21:36:50 av Rich Gauszka (1:379/45)
Ärende: wireless HDMI interface coming soon via ultrawideband?
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From: "Rich Gauszka" <gauszka@hotmail.com>

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=ETRSS02129TX1K0000
532

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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