Patents by Inventor Norman Joseph Driscoll

Norman Joseph Driscoll 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).

  • Audio signal processing apparatus
    Patent number: 4006306
    Abstract: Improved audio reproduction apparatus permits upgrading a two channel high fidelity ("stereo") system to four channel ("quadraphonic") capability, while flexibly accommodating varying four channel source signal formats, e.g., four channel discrete, or encoded two channel SQ (e.g., tape, FM) or CD-4 (phonograph). The composite arrangement includes demodulation circuitry for the variously formated incoming signals, and plural variable gain amplifier arrays for final signal source selection which is readily effected by off-board minimal, DC switching.
    Type: Grant
    Filed: October 10, 1975
    Date of Patent: February 1, 1977
    Assignee: Yudin Industries, Inc.
    Inventor: Norman Joseph Driscoll