Control unit for controlling modem used in receiver
First Claim
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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Accused Products
Abstract
A control unit for controlling a modem used in a receiver demodulates a received signal by use of an adaptive equalizer, and a recovery circuit includes a timing recovery function and a carrier recovery function. States regarding operations in the adaptive equalizer and the recovery circuit are updated based on the received signal. The modem includes a determination unit for determining whether or not the modem is operating unusually based on a signal processed in the modem, a buffer for storing state data at a predetermined timing when the determination unit determines that the modem is not operating unusually, and a controller for controlling the adaptive equalizer and the recovery circuit so that the adaptive equalizer and the recovery circuit operate based on the state data which has been stored in the buffer when the determination unit determines that the modem is operating unusually.
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Citations
15 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control unit for controlling a modem used in a receiver which demodulates a received signal by use of an 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:
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determination means for determining whether or not said modem is operating unusually based on a signal processed in said modem; wherein said timing recovery means comprises; first means for generating a first synchronous signal based on the received signal; second means for generating a second synchronous signal which is synchronized with said first synchronous signal at a predetermined timing, a frequency of said second synchronous signal being maintained at a frequency which is obtained when said second synchronous signal is synchronized with said first synchronous signal; and control means for controlling said first means and said second means so that a synchronous signal used in said modem is switched from said first synchronous signal to said second synchronous signal when said determination means determines that said modem is operating unusually. - View Dependent Claims (13, 14, 15)
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Specification