Patents by Inventor Adrian M. Sandford

Adrian M. Sandford 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).

  • Signal identification system
    Patent number: 5113437
    Abstract: A signal identification system, suitable for producing an identification code on a sound track recording is described. The system includes an encoder 209 effective to eliminate a variable sequence of frequency bands from an audio signal and insert a sequence of code signals into the frequency bands. As the sequence of frequency bands varies throughout the sound track recording, the presence of the code is difficult to detect.
    Type: Grant
    Filed: October 25, 1989
    Date of Patent: May 12, 1992
    Assignee: Thorn EMI plc
    Inventors: Stuart J. Best, Nigel Johnson, Adrian M. Sandford