Patents by Inventor Michael T. H. Hewitt

Michael T. H. Hewitt 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).

  • Frequency control for point to multipoint radio
    Patent number: 4670889
    Abstract: A multipoint radio system has a single node which communicates with a plurality of outstations on one frequency. The outstations using a different single frequency to communicate with the node. The node controls the transmission frequency at the outstations, e.g. by transmitting error signals which adjust the set points of frequency control loops in the outstations. In a preferred embodiment the node allows for residual errors by adjusting the decision threshold of its regenerator to the outstation on transmission.
    Type: Grant
    Filed: September 5, 1984
    Date of Patent: June 2, 1987
    Assignee: British Telecommunications plc
    Inventor: Michael T. H. Hewitt
  • Communications network having a single node and a plurality of outstations
    Patent number: 4642806
    Abstract: In a time division multi-access communications system each burst in each slot commences with a preamble and the clocks used to control the sequence of operations are synchronized by means of these preambles. In particular the outstations control their transmissions to the node by timing pre-set delays from the receipt of the preamble. In a preferred embodiment the pre-set delays are adjusted by signals from the node so that bursts arrive at the node in correct sequence.
    Type: Grant
    Filed: September 5, 1984
    Date of Patent: February 10, 1987
    Assignee: British Telecommunications Public Limited Company
    Inventors: Michael T. H. Hewitt, John W. Ballance, Richard P. I. Scott