Abstract: A method and system for continuously and automatically calibrating the settings of an electronic compass, as needed, while a vehicle moves from place to place is shown. The calibration technique of the present invention measures the ocal magnetic field while the vehicle moves from place to place and determines points on a reference Cartesian coordinate system. Each such point defines the endpoint for a vector corresponding with the measured field intensity and orientation of the local magnetic field. Any three such points are used to calculate the center of a circle that extends through all of those points. A vector that begins at the origin of the reference Cartesian coordinate system and terminates at the calculated center of the circle is thereafter subtracted from subsequent field measurement vectors that correspond to the field intensity and direction of the local magnetic field.
Type:
Grant
Filed:
April 11, 2000
Date of Patent:
July 6, 2004
Assignee:
Electronics Tomorrow Limited
Inventors:
Patrick Fong Wing Hon, Johnny Tam Ping Wah
Abstract: An electronic chef's fork is provided which displays indicia such as food type and degree of doneness for a selected food type and temperature and which includes control areas by which the user of the electronic chef's fork selects the meat type. The operational circuitry of the device allows the user to select among an array of food type options and to thereby designate a degree of doneness for the selected type of food. A prompt message is provided to indicate the degree of doneness attained for the selected food type when the device is inserted into the food.
Type:
Grant
Filed:
August 13, 1999
Date of Patent:
May 23, 2000
Assignees:
Electronic Tomorrow Limited, Brookstone Company, Inc.
Inventors:
Christopher S. Archard, Patrick Fong Wing Hon, So Si Kin, Charles Wong Tak Chung, Rudy Woodard