Patents by Inventor Murphey L. Johnson

Murphey L. Johnson 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).

  • Systems and methods of processing information regarding determination of gain of an audio amplifier
    Patent number: 10637424
    Abstract: Systems and methods for processing information present in a digital audio stream to obtain a measure of gain of an analog-to-digital converter (ADC) preamplifier are disclosed. In one implementation, a method of processing information present in a digitally sampled stream to obtain a measure of ADC preamplifier gain used to digitize the output of a known transducer comprises transforming time-domain digital samples into the frequency domain through use of a discrete Fourier transform (DFT), and using knowledge of the maximum effective frequency associated with the frequency response of the transducer to process frequency-domain data to obtain a measure of the gain of the ADC preamplifier.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: April 28, 2020
    Assignee: ShotSpotter, Inc.
    Inventors: Murphey L. Johnson, Mark A. Sompel, Robert B. Calhoun
  • Systems and methods of processing information regarding weapon fire location using projectile shockwave and muzzle blast times of arrival data
    Patent number: 8995227
    Abstract: Systems and method of processing information regarding weapon fire are set forth herein. In one exemplary implementation, a method of processing information regarding weapon fire, such as determining weapon fire location using projectile shockwave and muzzle blast time(s) of arrival data is disclosed.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: March 31, 2015
    Assignee: ShotSpotter, Inc.
    Inventor: Murphey L. Johnson