[opendtv] Re: Oldest claim to have solved multipath
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 30 Jan 2005 18:49:32 -0500
Thanks Bob.
But it seems my new hobby of collecting these got off to a bad start. I
have today lost either the system board or at least the hard drive of
the machine I've been using for years to talk to this list. I'm now on
my dev/test machine figuring out how to move it and it's unclear still
what sort of backups I've got.
So your contribution may be the only item in my collection for the
moment. :-(
- Tom (maybe offline for a bit)
Bob Miller wrote:
>Tom Barry wrote:
>
>
>
>>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
>>
>>--------------------------------------------------------------------------
>>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.
>>
>>
>>
>>
>
>Here is ATI's (NxtWave) of 1999. There was one at the same time from
>Motorola that I can not find. Later when they both were exposed as
>"inaccurate", especially the quote from below, "With the NXT2000 we've
>cracked the code for indoor and mobile reception, shown that VSB is a
>robust and commercially viable standard, and paved the way for mass
>market deployment of error-free digital TV,"said Matt Miller, president
>and CEO of NxtWave Communications Inc." it was postulated that it was
>not only inaccurate but was purposefully inaccurate for the purpose of
>derailing Sinclair's questioning of 8-VSB.
>
>Never understood the reason since ATI (NxtWave) did COFDM as well as
>8-VSB chips at the time and still do I believe. I guess NxtWave felt
>that they would dominate 8-VSB which they could not do with COFDM and
>according to them today, ATI that is, they do dominate 8-VSB for what
>that is worth.
>
>NxtWave Communications' Breakthrough Receiver Chip Makes Mobile and
>Indoor Reception of Broadcast Digital Television Possible
>
>NXT2000 Provides Increased Performance and Reduces Costs through On-Chip
>Advanced Blind Adaptive Equalization
>
>NxtWave Communications Inc., (nxtwavecomm.com) a developer of broadband
>communications integrated circuits (ICs), today introduced the first
>multimode VSB/QAM receiver chip that delivers error-free indoor and
>mobile reception of broadcast digital signals to digital televisions
>(DTVs), PCs and digital set-top boxes. Designated the NXT2000, the
>physical layer (PHY) device overcomes static and dynamic multipath
>interference typical in broadcast transmissions and provides the highest
>reliability and performance available.
>
>"With the NXT2000 we've cracked the code for indoor and mobile
>reception, shown that VSB is a robust and commercially viable standard,
>and paved the way for mass market deployment of error-free digital
>TV,"said Matt Miller, president and CEO of NxtWave Communications Inc.
>
>The high-performance, multimode integrated circuit is Advanced
>Television Systems Committee (ATSC) compliant and performs in either
>8VSB mode for terrestrial broadcasting or in 64 QAM, 256 QAM or 16VSB
>modes for cable TV. The exceptional performance of the NXT2000 cancels
>transmission channel impairments such as static and dynamic multipath,
>phase noise, adjacent or co-channel NTSC interference and impulse noise.
>It also greatly exceeds the performance demonstrated by the Grand
>Alliance reference system at the Advanced Television Test Center (ATTC).
>In addition to reliable reception, the device has important features for
>consumers. Such features include a built in signal quality indicator to
>ease antenna alignment and an ultra-fast signal acquisition (50
>milliseconds or less) that allows rapid channel surfing capability,
>which to date, has not been possible with other digital receivers.
>
>"We designed a completely new equalizer architecture that not only
>overcomes the severe impairments in broadcast channels, but also
>provides shorter acquisition times and reduces silicon cost. These
>features enable us to eliminate any barriers surrounding large-scale
>deployment of digital transmission for both terrestrial broadcast and
>cable applications. It is one of those rare cases in which increased
>performance and cost reduction come hand in hand," according to Mike
>Neshat, vice president, marketing and sales for
>
>NxtWave Communications Inc.
>
>The on-chip carrier recovery of the NXT2000 together with the advanced
>equalization scheme provides robust and dependable demodulation even
>when the VSB pilot is destroyed due to severe channel conditions. The
>equalizer range extends from -4.5 usec to 44.5 usec, nsuring reliable
>signal recovery in the harshest multipath conditions typical of
>terrestrial broadcast channels. The NXT2000 decodes 8 VSB terrestrial
>and cable signals such as SCTE DVS-031, ITU-J.83B, and MCNS
>DOCSIS-compliant 64/256 QAM. Other features include a "direct IF
>sampling" integrated analog-to-digital converter (ADC) and integrated
>FEC that greatly reduces the bill-of -materials (BOM) cost for set-top
>box and DTV manufacturers. The internal A/D converter also accepts a
>"low IF" input signal to enable integration into existing set-top box
>and DTV chassis designs. The programmable symbol rate allows for
>different VSB/QAM modes without requiring any VCXOs to drive the A/D
>converter.
>
><>The NXT2000 achieves power savings by operating the internal core at
>2.5V and the I/O ring at 3.3V to enable seamless interconnection with
>existing ICs. Packaged in a 100-pin thin quad flat pack TQFP), samples
>of the device currently are available; production quantities are
>scheduled for Q4'99. The price of the NXT2000 is $22.00 each in
>10,000unit quantities.
>
>Langhorne, PA, -- August 24, 1999 - ####
>
>About NxtWave Communications Inc.
>
>NxtWave Communications Inc develops broadband communications integrated
>circuits (ICs) for use in multiple mass markets. Using efficient and
>robust modulation and demodulation techniques, the Company's IC
>solutions satisfy the requirements of manufacturers of cable modems,
>interactive set-top boxes, digital
>
>TVs and PC video products. NxtWave
>
>Communications leverages proprietary algorithms in its receiver
>implementations of industry standard transmission formats including QAM,
>VSB, QPSK and NTSC. NxtWave Communications is headquartered in
>Langhorne, Pennsylvania with worldwide marketing and sales headquartered
>in Irvine, California. For additional information visit xtwavecomm.com.
>
>
>
>
>
>
>
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