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SCIENTIFIC-ATLANTA, ZENITH AND AT&T JOIN FORCES TO PURSUE ADVANCED TELEVISION TECHNOLOGIES

 SCIENTIFIC-ATLANTA, ZENITH AND AT&T JOIN FORCES
 TO PURSUE ADVANCED TELEVISION TECHNOLOGIES
 NEW YORK, Dec. 4 /PRNewswire/ -- Scientific-Atlanta, Inc. (NYSE: SFA) has joined forces with Zenith Electronics Corporation (NYSE: ZE) and AT&T (NYSE: T) on advanced television technologies, the companies announced today.
 HDTV. In high definition television, the companies said they will team to support the selection of the Zenith/AT&T Digital Spectrum Compatible high definition television (DSC-HDTV) system as the U.S. HDTV standard by the Federal Communications Commission (FCC). Scientific-Atlanta will develop the necessary transmission and conditional access system and equipment to allow secure satellite transmission of the Zenith/AT&T DSC-HDTV signal to make HDTV programming available to all markets and to support a timely market introduction.
 William J. Warwick, president of AT&T Microelectronics, said: "We are enthusiastic about Scientific-Atlanta's joining Zenith and us in support of the DSC-HDTV system. Satellite and cable TV delivery are important links in the path to the consumer and Scientific-Atlanta is a world leader in designing and implementing satellite delivery systems and cable TV networks and equipment."
 William E. Johnson, Scientific-Atlanta's chairman and chief executive officer, said: "We are pleased to be a part of the Zenith, AT&T, Scientific-Atlanta team supporting the DSC-HDTV system for the U.S. standard. We believe that the Zenith/AT&T DSC system is the strongest contender in the HDTV standards race."
 In addition to developing HDTV-related satellite technologies, Scientific-Atlanta will contribute to testing of the Zenith/AT&T system over satellite.
 ADVANCED TELEVISION. Zenith and Scientific-Atlanta announced that under a separate agreement they have developed a common transmission structure for carrying the Zenith/AT&T digital HDTV signal and Scientific-Atlanta's digitally compressed standard TV signal through cable plants to the home. This will combine Scientific-Atlanta's powerful Vector Quantization (VQ) digital compression system for standard TV signals with Zenith's flexible and rugged 4-level vestigial sideband (VSB) modulation technology, which is also being used for terrestrial broadcast in the Zenith/AT&T HDTV proposal.
 Similarly, Scientific-Atlanta will utilize a common transmission structure in the satellite system for carrying the Zenith/AT&T HDTV digital signal and for Scientific-Atlanta's digitally compressed standard TV signals. Thus, both the Zenith/AT&T HDTV signal and Scientific-Atlanta's VQ digital compression signal will have end-to-end transmission compatibility over satellite and down the cable to the home. Programmers and cable operators will benefit in flexibility and cost because the same transmission equipment will handle both HDTV and VQ digitally compressed standard TV. The U.S. consumer will share in these benefits not only because of transmission efficiencies but also because the same high definition television set tuner will accept HDTV signals off the air or down the cable, resulting in lower cost TV sets and cable boxes.
 On Dec. 2, Scientific-Atlanta, supported by Zenith, submitted a proposal to Cable Television Laboratories, Inc. (CableLabs), Tele-Communications, Inc. (TCI), Viacom International and the Public Broadcasting System (PBS) to develop a system for compressing multiple standard NTSC signals into a single channel for both satellite and cable transmission. The new digital program delivery system will incorporate the compatible transmission of both Zenith/AT&T DSC-HDTV and VQ digitally compressed standard TV using the Zenith 4-level VSB modulation. This system includes delivery over both satellite and cable and would allow two HDTV signals or four to 10 digitally compressed standard television signals in one satellite transponder.
 Scientific-Atlanta and Zenith have also submitted a joint proposal to Home Box Office (HBO) for the same type of digital program delivery system. If VQ/4-VSB is selected for cable transmission, Zenith said it would include the VQ decoder in its HDTV sets to handle digitally compressed standard TV signals.
 "We are excited to have Scientific-Atlanta supporting the DSC-HDTV system proposal," said Jerry K. Pearlman, Zenith chairman, president and chief executive officer. "With their strengths in satellite transmission and digital networks, we will be able to make HDTV a reality sooner. Also, by combining forces on digital compression for standard television, we will be able to bring high performance, low cost, digital video to the cable industry, and at the same time lay a compatible transmission foundation for the smooth adoption of HDTV."
 Johnson said: "We are designing a digital television transmission network for satellite and cable that will deliver not only the Zenith/AT&T DSC-HDTV signal, but also high quality digitally compressed standard television with Scientific-Atlanta's VQ technology and Zenith's 4-level VSB transmission technology. This partnership will provide the U.S. consumer with an efficient and rugged digital television delivery system for both HDTV and standard television and it will help the United States maintain its global leadership position in cable television technology."
 Scientific-Atlanta has developed "Vector Quantization" (VQ) digital video compression to achieve a high performance end-to-end system for the delivery of multiple digital TV signals over satellite and through the cable plant. VQ offers powerful intra-frame compression, insensitivity to motion in video images, flexibility and ruggedness and affordable decoder technology.
 Zenith's 4-level vestigial (4-VSB) modulation technique in cable applications assures noise-free and interference-free reception. The 4-VSB technique is ideal for cable transmission of both DSC-HDTV and Scientific-Atlanta's VQ digitally compressed signal.
 -0- 12/4/91
 /CONTACT: Bob Meyers of Scientific-Atlanta, 404-441-4608; John Taylor of Zenith, 708-391-8181; or Mary Lou Ambrus of AT&T, 908-771-2825/
 (SFA ZE T) CO: Scientific-Atlanta, Inc.; Zenith Electronics Corporation; American
 Telephone and Telegraph Company ST: Georgia IN: CPR SU:


BN-AW -- AT009 -- 9286 12/04/91 14:31 EST
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Date:Dec 4, 1991
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