Patents by Inventor Andrew K. Borland

Andrew K. Borland 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).

  • Telecommunications system data alignment equipment and method
    Patent number: 5377209
    Abstract: Synchronization of a receiving termination of a telecommunications system with an incoming data stream is carried out from a synchronization signal carried with the data stream. It is possible that a "mimic" of the synchronization signal may occur within the data stream. Two frame alignment detectors operate in worker/standby relationship, one being locked to a detected synchronization signal and the second searching for an alternative signal. Verification is carried out using a cyclic redundancy check.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: December 27, 1994
    Assignee: GPT Limited
    Inventors: Ian J. Skinner, Geoffrey Chopping, Andrew K. Borland, Ernest Culley
  • Circuit arrangement for use in the time division multiplexed signalling system
    Patent number: 4984236
    Abstract: In a forty megabit per second TDM signalling system in which twenty 2 megabit per second signalling streams are combined, one of the twenty primary signalling streams is inverted by the circuit arrangement and substituted for one of the other signalling streams. By using adjacent channels the forty megabit signal stream has a guaranteed change of data at least once every twenty bits. The system facilitates clock recovery and synchronization in apparatus employing bi-phase mark encoded data.
    Type: Grant
    Filed: January 13, 1989
    Date of Patent: January 8, 1991
    Assignee: Plessey Company plc
    Inventors: Geoffrey Chopping, Andrew K. Borland