Patents by Inventor James Bryon Sherman

James Bryon Sherman 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).

  • Patent number: 4052557
    Abstract: In a phase-modulated communication system utilizing voice-band communication channels wherein phase-jumps may be experienced, a phase-jump detector indicates the occurrence of such phase-jumps. A phase-jump corrector responds to the persistence of a phase-jump condition by correcting for it without requiring shut-down and complete reequalization of the transmission channel. Monitoring of the incoming signal for phase-jump occurrence provides a convenient signal quality indication that represents the magnitude of the error in the X and Y components of each received symbol.
    Type: Grant
    Filed: July 31, 1975
    Date of Patent: October 4, 1977
    Assignee: Milgo Electronic Corporation
    Inventors: Ran-Fun Chiu, James Bryon Sherman, Judson Truman Gilbert
  • Patent number: 4035625
    Abstract: A phase modulation modem providing switch selectable speeds on voice-band channels utilizes four phase, modified eight phase, and optimized eight phase, two amplitude modulation techniques. A binary equalizer automatically corrects for envelope delay and amplitude distortion of the carrier signal caused by the voice-band channel. Each symbol time, the X-axis error and Y-axis error for the received symbol is determined by comparing the received X and Y components with stored ideal X and Y components for that symbol. These error X and error Y values are used to modify primary and secondary equalization constants. The equalization constants, thus modified during this symbol time, are used on the next received symbol to correct for the phase and amplitude distortion measured during past symbol times. This sequence is repeated for each symbol time. Preselected equalization constants are utilized on the first symbol received.
    Type: Grant
    Filed: July 31, 1975
    Date of Patent: July 12, 1977
    Assignee: Milgo Electronic Corporation
    Inventors: Ran-Fun Chiu, James Bryon Sherman, Judson Truman Gilbert