Patents by Inventor Carroll T. Pardoe

Carroll T. Pardoe 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).

  • Patent number: 3953674
    Abstract: Simultaneous phase lock and synchronization acquisition of an L format biphase input signal having a pseudorandom sequence are obtained with a delay lock loop including a feedback shift register for deriving a first non-return to zero (NRZ) output signal having the same pseudorandom sequence as the input signal. An output of the shift register is compared with the input signal to derive a phase indicating binary error signal that is fed to a digital filter for deriving a binary output signal to control the transition times of a clock signal derived from a voltage controlled clock source. The digital filter is activated and the shift register is advanced in response to the clock signal. The input signal is converted into a second NRZ signal that has the same information content as the input signal. The first and second NRZ signals are compared to derive a further signal indicative of an estimate of the correlation function between the input signal and the output signal of the shift register.
    Type: Grant
    Filed: April 4, 1975
    Date of Patent: April 27, 1976
    Inventors: James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher, Carroll T. Pardoe