Patents by Inventor Martin J. Kelland

Martin J. Kelland has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • AFC System for controlling an oscillator according to an input frequency
    Patent number: 4453136
    Abstract: An automatic frequency control system includes a frequency measuring unit (IFM), which produces a frequency quantity representing the frequency of its input signal, and a controllable-frequency signal generator (VCO), which produces an output signal whose frequency depends on a control signal supplied to its control input. In a normal mode of operation, IFM derives its input signal from an external source connected to an input terminal (T), and the system derives from the frequency quantity produced by IFM, a control signal for VCO, using a predetermined transfer characteristic, so that the output frequency of VCO is dependent on the frequency of the input signal to IFM, being, for example, equal to the frequency of the signal at T.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: June 5, 1984
    Assignee: U.S. Philips Corporation
    Inventor: Martin J. Kelland