Patents by Inventor Vincent James Troy

Vincent James Troy 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).

  • Method and a circuit for detecting the presence of a television or other device on the output of a video digital to analog converter
    Patent number: 6411330
    Abstract: A detector circuit (1) for detecting the presence or absence of a television (2) on an output (3) of a video DAC (4) comprises a comparator (11) for comparing a voltage developed by the video signal on a control resistor R2 with a reference voltage of 0.5 volts. The resistor R2 is of 75 ohms and matches the internal impedance R1 of 75 ohms of the television (2). A latch (12) latches the output from the comparator (11) onto an output pin Q when the voltage developed across the control resistor R2 is developed by an equalisation pulse of the vertical blanking interval of the video signal. In the presence of a television (2) the voltage developed across the control resistor R2 is 0.35 volts, which pulls the output of the comparator (11) low, while in the absence of a television (2) the voltage developed across the control resistor R2 is 0.7 volts which pulls the output of the comparator (11) high.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: June 25, 2002
    Assignee: Analog Devices, Inc.
    Inventors: John Patrick Purcell, Vincent James Troy, Kieran Heffernan