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Multiple QAM digital television signal decoder

  • US 5,386,239 A
  • Filed: 03/14/1994
  • Issued: 01/31/1995
  • Est. Priority Date: 05/03/1993
  • Status: Expired due to Term
First Claim
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1. In a system for processing a television signal, digital signal processing apparatus comprising:

  • input means for receiving a multiple carrier composite QAM signal conveying data occupying given locations in a grid-like constellation;

    signal conditioning means, including adaptive equalizer means, responsive to said composite signal for providing a conditioned composite signal at an output, said equalizer means including a single equalizing device having a wideband response encompassing more than one of said carriers and defined by one set of coefficients for equalizing said more than one carriers without separating said more than one carriers from the spectrum of said composite signal prior to equalization;

    means for deriving an error signal representing a condition of said QAM signal; and

    means for coupling said error signal to said signal conditioning means.

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