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Control unit for controlling modem used in receiver

  • US 5,228,060 A
  • Filed: 07/29/1991
  • Issued: 07/13/1993
  • Est. Priority Date: 07/31/1990
  • Status: Expired due to Term
First Claim
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1. A control unit for controlling a modem used in a receiver which demodulates a received signal by use of adaptive equalizer means for equalizing the received signal, timing recovery means for generating a synchronous signal based on the received signal, and carrier recovery means for presuming a phase of a carrier in the received signal, states regarding operations in said adaptive equalizer means, said timing recovery means, and said carrier recovery means being updated based on the received signal, said control unit comprising:

  • determination means for determining whether or not said modem unusually operates based on a signal processed in said modem;

    storage means, coupled to said determination means, for storing state data at a predetermined timing when said determination means determines that the modem is not operating unusually, the state data representing states regarding operations in said modem; and

    control means, coupled to said determination means and said storage means, for controlling at least one of said adaptive equalizer means, said timing recovery means and said carrier recovery means so that said at least one of said adaptive equalizer means, said timing recovery means and said carrier recovery means operate based on the state data which has been stored in said storage means when said determination means determines that said modem is operating unusually.

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