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Method and apparatus for communicating digital television signals using a signal constellation formed by four signal constellations placed in the quadrants

  • US 5,565,926 A
  • Filed: 12/29/1994
  • Issued: 10/15/1996
  • Est. Priority Date: 05/07/1993
  • Status: Expired due to Term
First Claim
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1. A method for transmitting a modulated digital television signal using a first signal constellation having a plurality of sections, said method comprising the steps of:

  • a) forming a plurality of first data portions from a source of television information;

    b) coding said first data portions using a second signal constellation having fewer points than said first signal constellation so as to form second data portions;

    d) providing a third data portion indicating for each of said first data portions, a respective section of said first signal constellation; and

    e) modulating each said second data portion in a manner which utilizes its respective third data portion to form respective data words each representing a respective position within said second constellation and said respective section within said first constellation in which said respective second constellation is disposed.

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