The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2008
Filed:
Feb. 05, 2003
Anthony Richard Hardie-bick, London, GB;
Anthony Richard Hardie-Bick, London, GB;
SoundTouch Limited, Whitstable, Kent, GB;
Abstract
A touch pad () includes transducers (-) for receiving acoustic signals resulting from touch events, such as the continuous movement of a fingertip across the surface () of the touch pad. The acoustic signals are acquired at different transducer locations in the surface. Signals from different transducers are combined, preferably in antiphase, to improve signal characteristics. The transducer signals are supplied to a stereo analogue to digital converter (). Phase differences () are obtained and compared () with phase difference profiles () of known location, in order to identify the location of the touch event. An index () is used to identify candidate locations to reduce the amount of processing. Interpolation () is used to locate the touch event between profile locations.