Patents by Inventor Raymond J. Derrick

Raymond J. Derrick 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).

  • Information signal compressor and expander
    Patent number: 6518852
    Abstract: An apparatus and method for compressing and expanding an information signal for use in noise reduction which includes an input terminal to receive the information signal, a first frequency crossover circuit coupled to the input terminal and configured to divide the information signal into a first and second frequency band. A second frequency crossover circuit coupled with the first crossover circuit configured to receive at least a portion of the information signal within the first frequency band and to further divide the information signal into a third and fourth frequency band. A third frequency crossover circuit coupled with the first crossover circuit configured to receive at least a portion of the information signal within the second frequency band and to divide the information signal into a fifth and sixth frequency band.
    Type: Grant
    Filed: April 18, 2000
    Date of Patent: February 11, 2003
    Inventor: Raymond J. Derrick