[opendtv] Oldest claim to have solved multipath
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 30 Jan 2005 13:18:19 -0500
On a lazy Sunday afternoon I've taken up a crusade to collect old press
releases from Zenith and others of how they have solved the multipath
problems.
The oldest Zenith claim I've found so far is from Electronics Weekly
back in April 1997, see <http://www.electronicsweekly.com/Article7552.htm>
Can anyone provide others?
- Tom
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Friday 4 April 1997
Zenith claims first with ICs for US HDTV system
Simon Parry
Zenith Electronics claims it has developed the industry's first ICs for
the digital HDTV terrestrial broadcast transmission system adopted by
the Federal Communications Commission (FCC).
The two ICs will demodulate the digital television signal transmitted by
broadcasters. Zenith invented the FCC approved VSB (vestigial sideband)
digital transmission technology at the heart of the ATSC DTV standard.
The chips are expected to be available later this year.
Laboratory testing of first-generation chips shows compatibility with
the FCC-adopted VSB transmission system, according to Paul Snopko,
Zenith's R&D director.
The VSB chip-set, manufactured by LG Semicon, includes two Asics, one
for synchronisation and equalisation and one for channel decoding. The
sync/equaliser chip locks the receiver to the VSB signal and removes
NTSC co-channel interference and multipath distortion (ghosts) from the
received signal. The channel decoder chip corrects errors in the
received signal using Reed-Solomon and trellis coding error correction
methods.
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