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Trainable transmitter having improved frequency synthesis

  • US 6,703,941 B1
  • Filed: 08/06/1999
  • Issued: 03/09/2004
  • Est. Priority Date: 08/06/1999
  • Status: Expired due to Term
First Claim
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1. A trainable transmitter comprising:

  • a receiver for receiving a signal from a transmitter;

    a signal generator for generating a signal having a frequency related to a frequency control signal supplied to a frequency control terminal of said signal generator; and

    a processor directly coupled to the frequency control terminal of said signal generator for supplying the frequency control signal and directly coupled to an output terminal of said signal generator for monitoring the frequency of the signal output from said signal generator;

    wherein said processor monitors the frequency of the signal output from said signal generator by determining when the level of the signal exceeds a threshold and counting the number of times the signal level exceeds the threshold in each of a plurality of predetermined time periods wherein the predetermined time periods are of different durations.

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