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Zenith Reports 8-VSB Receiver Multipath Performance Improvements Across Three Generations

John Taylor · 1999

Mentioned: John Taylor

Summary

Zenith Electronics released laboratory measurements showing significant multipath and ghost-cancellation improvements across first-, second-, and third-generation 8-VSB digital television receivers. Second-generation receivers shipping since July 1999 handle dynamic ghosts up to 70 percent of the original signal, surpassing NTSC analog performance thresholds.

"As a basis for comparison, the data also shows that most first-generation receivers and all second- and third-generation receiver- significantly outperform NTSC receivers in terms of ghost performance."

Responds

Monday, October 11, 1999

In light of discussions about indoor reception issues related to digital television receivers, Zenith has-been characterizing performance of first-, second- -and third generation 8-VSB receivers. Laboratory measurements of worst case multipath performance show significant improvements in products on the market now and planned for introduction in the near future-

The attached chart illustrates the evolution of receivers as measured for multipath performance. While many measurements were made, this example is based on a one microsecond dynamic ghost, representative of indoor reception problems. The four bars on the left show ghost cancellation capabilities of first-generatioti receivers.

Some first-generation receivers (such as Zenith's) performed better but, in the interest of fairness, the chart shows typical first generation receivers. The second-generation receiver shown here, which has been shipping since July, is able to handle dynamic ghosts up to 70 percent of the original signal, based on the same measurement parameters. The third- generation receiver, expected to be available next year, shows further enhancement

As a basis for comparison, the data also shows that most first-generation receivers and all second- and third-generation receiver- significantly outperform NTSC receivers in terms of ghost performance. For example, the ghost threshold for NTSC is about 35 percent before most analog TV sets would lose vertical sync (and become unwatchable).

Zenith Electronics Corporation

John Taylor

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Copyright 1999

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