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Digital satellite receiver controller

  • US 7,961,083 B2
  • Filed: 08/29/2007
  • Issued: 06/14/2011
  • Est. Priority Date: 08/29/2007
  • Status: Expired due to Fees
First Claim
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1. A system comprising:

  • a sensor to provide a signal corresponding to a status of an apparatus;

    a satellite receiver to detect the signal from the sensor and to provide a signal indicating the status of the apparatus via a signal line;

    a digital control circuit to receive the signal via the signal line and to supply power to the signal line, said digital control circuit to generate an indication signal to activate a device in response to receipt of the signal, the digital control circuit comprising;

    a signal line converter circuit to determine the signal line voltage and to generate a signal corresponding to a voltage level when the voltage level of the signal line is within a first predetermined voltage range; and

    a digital to analog converter circuit to set the voltage level of the power supplied to the signal line and to generate a voltage level within the second predetermined range, the first and second predetermined voltage ranges have maximum and minimum potentials with respect to ground;

    a synchronization circuit to generate a periodic sync pulse on the signal line for transmission to the satellite receiver; and

    a reference voltage generation circuit to simultaneously adjust the maximum and minimum potentials of the first and the second predetermined voltage ranges during the generation of the periodic sync pulse.

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