US Patent 9443422 Frequency shifting method for universal transmitters

Methods and systems for modifying a carrier frequency for a trainable transmitter may include receiving a request to transmit a control signal from the trainable transmitter to a receiver. A transmission of a first control signal may be made using a trained carrier frequency and a control data. At least part of the carrier frequency may be shifted by a frequency increment. A second control signal may then be generated using the carrier frequency shifted by the frequency increment and the control data. The second control signal may then be transmitted.