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FIELD TEST PROVES LONG-DISTANCE HDTV BROADCAST; ZENITH-AT&T DIGITAL HDTV SIGNAL TRANSMITTED 75 MILES

 FIELD TEST PROVES LONG-DISTANCE HDTV BROADCAST;
 ZENITH-AT&T DIGITAL HDTV SIGNAL TRANSMITTED 75 MILES
 GLENVIEW, Ill., May 29 /PRNewswire/ -- Zenith Electronics (NYSE: ZE) and AT&T (NYSE: T) proved last night that digital high-definition television (HDTV) broadcasting can bring high-quality, snow-free, interference-free TV pictures to a broader service area than conventional TV broadcasts, Zenith announced today.
 In the first long-distance over-the-air field test of an all-digital HDTV signal, Zenith and AT&T conducted a broadcast from a TV station in Milwaukee 75 miles to Zenith's technical center in Glenview.
 The late-night field test of the Zenith-AT&T "Digital Spectrum Compatible" HDTV system, broadcast on Milwaukee Public Television Station WMVT Channel 36, was the first ever terrestrial broadcast of digital TV signals using low power over long distances. The test also proved that digital HDTV can provide high-quality, noise-free pictures even in the presence of interference from conventional TV signals on the same channel.
 Using less than one-tenth of the power used to transmit a full-power conventional analog TV signal, Zenith and AT&T successfully transmitted and received digital signals -- without noise, snow or ghosts.
 The test showed that the Zenith-AT&T system's unique digital compression and transmission technologies can eliminate the so-called "cliff effect," a total and abrupt loss of the TV picture and sound that could be caused by errors in transmitted digital data at long distances from the transmitter.
 The test showed that even the most complex high-definition program material can be compressed into a single 6-MHz channel with excellent quality. The resulting compressed signal is very robust.
 The test also showed the Zenith-AT&T system's ability to prevent "co-channel interference" or interference that occurs when two channels are operating on the same frequency. An analog TV station in Palatine, Ill. -- less than 10 miles from the Glenview receiving site -- also broadcasts on Channel 36.
 Before transmission, the test material images were processed through the Zenith-AT&T compression system. At the transmitter site, a digital recorder played a compressed videotape of the materials. At the receiving site, the signal was decompressed and displayed on high-definition monitors.
 Zenith and AT&T plan to share the field test data with the Federal Communications Commission's Advisory Committee on Advanced Television Service and its HDTV Field Test Task Force.
 -0- 5/29/92
 /CONTACT: John Taylor of Zenith, 708-391-8181; or Bob Ford of AT&T Bell Laboratories, 201-564-4260; or Mary Lou Ambrus of AT&T Microelectronics, 908-771-2825; or David Felland of WVMT, 414-271-1036/
 (ZE T) CO: Zenith Electronics; AT&T ST: Illinois, New Jersey IN: TLS SU:


TS -- NY013 -- 5092 05/29/92 09:37 EDT
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Publication:PR Newswire
Date:May 29, 1992
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