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Method for automatically initiating a computer security and/or screen saver mode

  • US 6,401,209 B1
  • Filed: 03/09/1998
  • Issued: 06/04/2002
  • Est. Priority Date: 03/09/1998
  • Status: Expired due to Term
First Claim
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1. A method of controlling the operating mode of a computer, comprising:

  • detecting whether a person is located proximate the computer, wherein the detecting includes;

    broadcasting a first signal in an area proximate the computer;

    detecting a reflected signal from the person proximate the computer;

    receiving a relatively low frequency signal indicative of a frequency difference between the first signal and the reflected signal;

    converting the relatively low frequency signal to a converted signal indicative of an amplitude of the low frequency signal; and

    comparing the converted signal with a predetermined threshold to determine whether the person is located proximate the computer; and

    allowing the computer to execute a screen saver program responsive to detecting that no persons are located proximate the computer.

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