Patents by Inventor John C. Feggeler

John C. Feggeler 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).

  • Expanded partial response processing for analog signal enciphering and the like
    Patent number: 4754481
    Abstract: Partial response signal processing is applied to samples of an analog signal quantized in an amplitude range having a sufficient number of levels that a sample amplitude error of a small percentage of the total levels of the range is not readily perceptible to the human auditory function and that it exhibits tolerable quantizing noise. Samples received into the processing in a transmitting station are sample masked for privacy enciphering. Complementary processing is employed for a receiving station.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: June 28, 1988
    Assignee: Atlantic Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: John C. Feggeler
  • Reversible energy spreading data transmission technique
    Patent number: 4748639
    Abstract: In a data transmission system including a transmission medium that is subject to fast fades of duration longer than individual data symbols to be transmitted, a chirp filter is provided for time-spread processing the data signals prior to transmission. The processing spreads the energy of each symbol over an interval longer than the length of expected individual fades. In a receiving terminal inverse processing is provided to remove the chirp effect.
    Type: Grant
    Filed: April 25, 1985
    Date of Patent: May 31, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: John C. Feggeler