Patents by Inventor Burrell C. Smith

Burrell C. Smith 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).

  • Sound generation and disk speed control apparatus for use with computer systems
    Patent number: 4910670
    Abstract: An apparatus for generating an analog audio signal and a speed control signal for a disk drive for use with a microprocessor having a RAM which provides a video signal for a raster scanned display. Direct addressing to the RAM is used during horizontal blanking periods to allow data to be read from the RAM and used to generate the audio and speed control signals. The data is updated during the blanking periods. The speed control signal to the disk controller varies as a function of track (radius).
    Type: Grant
    Filed: May 19, 1987
    Date of Patent: March 20, 1990
    Assignee: Apple Computer, Inc.
    Inventors: Burrell C. Smith, Andrew J. Hertzfeld