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Universal transmitter

  • US 7,006,802 B2
  • Filed: 01/15/2002
  • Issued: 02/28/2006
  • Est. Priority Date: 11/09/1998
  • Status: Expired due to Fees
First Claim
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1. A universal transmitter, comprising:

  • an input circuit including an antenna, a central processing unit (CPU) coupled to the input circuit, and a radio frequency (RF) circuit coupled to the CPU;

    said CPU to generate a plurality of discrete digital outputs;

    said RF circuit, in response to the plurality of discrete digital outputs, to generate and transmit a local RF signal at a scanning frequency;

    said input circuit to receive the local RF signal and a template RF signal including a target frequency and a modulation pattern, and to mix the local RF signal and the template RF signal and provide a mixed signal; and

    said CPU to (i) incrementally increase the scanning frequency of the local RF signal by a first predetermined amount, starting from a lower scanning frequency, until a magnitude of the mixed signal, above a lower threshold value, is detected, (ii) incrementally increase the scanning frequency of the local RF signal by a second predetermined amount until the magnitude of the mixed signal falls to or below the lower threshold value, (iii) store the current scanning frequency as a first frequency;

    (iv) increase the scanning frequency by a third predetermined amount;

    (v) incrementally decrease the scanning frequency by a fourth predetermined increments until the magnitude of the mixed signal falls to or below the lower threshold value;

    (vi) store the current scanning frequency as a second frequency, and (vii) determine the target frequency as being between the first and second frequencies.

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