Patents by Inventor David J. Hetherington

David J. Hetherington 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).

  • Apparatus and method for smooth audio scaling
    Patent number: 5289546
    Abstract: Apparatus and method for scaling volume for a multimedia computer system are disclosed. A volume control algorithm, in association with the computer system hardware, increases or decreases the perceived volume over time. The increase or decrease in volume being scaled to correspond to the logarithmic nature of perceived audio transmissions. Thus, fifty percent of the maximum on a given volume scale corresponds to a human perceived half volume output.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: February 22, 1994
    Assignee: International Business Machines Corporation
    Inventor: David J. Hetherington