Patents by Inventor Robert B. Holmes

Robert B. Holmes 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).

  • Logarithmic analog to digital converter
    Patent number: 4625197
    Abstract: A method and apparatus for converting an analog input signal to a digital output signal equal to the logarithm of the ratio of the input signal to a reference signal includes a method and apparatus for counting the cycles from a fixed frequency source for the time required for a capacitor to discharge through a resistor from a reference voltage to a calibration voltage; storing the result; counting the cycles from the same fixed frequency source for the time required for the capacitor to discharge through the resistor from the reference signal to the input signal and dividing the result by the stored result.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: November 25, 1986
    Assignee: Milton Roy Company
    Inventor: Robert B. Holmes