Patents by Inventor John Frederic Parrish

John Frederic Parrish 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).

  • Hydrophone Response Compensation Filter Derivation, Design and Application
    Publication number: 20150260878
    Abstract: A method to derive, design and apply digital signal filters to compensate for variations in hydrophone sensitivity. The impedance or resonance of a hydrophone is measured and compared respectively to the impedance or resonance values from a library of hydrophone responses containing values for impedance, resonance, amplitude sensitivity, phase response, or other hydrophone characteristics. A corrective filter is determined based on library values, and this filter is applied to the data collected by the hydrophone.
    Type: Application
    Filed: March 10, 2015
    Publication date: September 17, 2015
    Inventors: Miller Lee Bell, John Frederic Parrish, Nicolau Palm