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FIELD TEST OF DIGITAL CABLE TV TECHNOLOGY TRANSMITS TWO HDTV SIGNALS IN ONE CHANNEL

 -- Zenith, TV Guide In Electronic Program Guide Effort --
 SAN FRANCISCO, June 7 /PRNewswire/ -- In a dramatic field test of digital cable television technology, two full high-definition television (HDTV) signals are being transmitted and received on one cable channel here this week.
 Conducted by Zenith Electronics Corp. (NYSE: ZE) in cooperation with Viacom Cablevision of San Francisco, the test underscores the rugged transmission capabilities of Zenith's 16-level vestigial sideband (16- VSB) digital modulation technology, which complements any video compression techniques.
 Separately, Zenith Cable Products, a division of Zenith Electronics Corp., announced plans to work with "TV Guide On Screen" on interactive electronic program guide technology.
 In the HDTV test, the two digital signals (on compressed videotape) are being transmitted on Channel JJ (channel 46) from Viacom's cable headend through a 19-amplifier cascade to the receiving site -- both 1837 at the National Cable Television Association convention.
 There, the signals are being demodulated and decompressed (utilizing hardware from the Zenith-AT&T digital HDTV system) and displayed on a prototype Zenith 34W HDTV receiver.
 The 16-VSB system was tested by CableLabs (Cable Television Laboratories Inc.) this Spring and by Videoway Communications Inc. in Canada last month.
 John W. Bowler, president of the Zenith Cable Products division, said those tests, as well as this week's San Francisco tests, show that the system would provide 33 percent more data than proposed 64-QAM (quadrature amplitude modulation) approaches for cable.
 "In addition to the capability of transmitting two full HDTV channels, the system will be able to deliver as many as 23 movie channels or nine live video channels in each 6-MHz analog cable channel," he said. "Most important, we can do this using current video compression techniques."
 Wayne C. Luplow, Zenith's division vice president of advanced television R&D, said the field tests show the unique capability of 16- VSB to transmit a full 43 megabits-per-second (Mbps) of digital video information on a 6-MHz cable TV channel.
 Because of the system's unique synchronizing signals including a pilot carrier, it can acquire and lock the digital signal even in adverse noise and interference conditions found in cable distribution systems. Luplow said that even with micro-reflections (ghosts) and white noise conditions, the data can be received error-free because of the synchronization signals and forward error correction.
 The TV Guide-Zenith collaborative effort (also announced at the NCTA Show today) would capitalize on the flexibility and advanced display capabilities of Zenith's HT-2000 addressable cable converter to receive the unique program guide service offered by TV Guide On Screen.
 "We are very impressed with powerful capability of the HT-2000 in handling a variety of information displays, as well as the capability to download custom screens for subscribers," said Bruce Davis, president of TV Guide On Screen (the on-screen programming guide venture of News America Publishing Inc. and Liberty Media).
 John W. Bowler, president of Zenith Cable Products, a division of Zenith Electronics Corp., said working with TV Guide On Screen further strengthens Zenith's position as a leader in interactive cable TV technologies.
 The HT-2000 is the first addressable decoder with built-in capability to receive and display electronic program guide and other data services from multiple providers.
 The decoder features unique Zenith-developed on-screen display technology that is designed to work with electronic program guides from StarSight Telecast (formerly InSight) and from Prevue Networks/United Video.
 "Adding TV Guide On Screen capability to the HT-2000 complements all of our other activities in the exciting new electronic program guide arena," Bowler said.
 -0- 6/7/93
 /CONTACT: John T. Taylor of Zenith, 708-391-8181/
 (ZE)


CO: Zenith Electronic Corp., Viacom Cablevision of San Francisco ST: California IN: CPR SU: PDT

LD -- NY096 -- 6284 06/07/93 18:29 EDT
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Date:Jun 7, 1993
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