Patents Represented by Attorney Jack D. Sloboo

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  • Transmission system with improved tone detection
    Patent number: 5850438
    Abstract: In a transmission system, a tone is transmitted by a transmitter to a receiver via a transmission channel. In the receiver, a tone detector is used to detect the presence of a signalling tone. In order to improve a reliability of the tone detector when the arrival of the signalling tone is unknown, a number of correlators having mutually displaced measuring periods are used. More than two correlators are used in order to reduce the measuring period, also resulting in an improved reliability of the tone detection.
    Type: Grant
    Filed: April 16, 1996
    Date of Patent: December 15, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Harm Braams, Cornelis M. Moerman