Resources Contact Us Home Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE     Touch pad Image Number 11 for United States Patent #7411581. A touch pad (101) includes transducers (201-204) for receiving acoustic signals resulting from touch events, such as the continuous movement of a fingertip across the surface (105) 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 (407). Phase differences (706) are obtained and compared (703) with phase difference profiles (607) of known location, in order to identify the location of the touch event. An index (606) is used to identify candidate locations to reduce the amount of processing. Interpolation (705) is used to locate the touch event between profile locations.       Recently Added Patents Nonvolatile memory element, nonvolatile memory device, nonvolatile semiconductor device, and method of manufacturing nonvolatile memory element Method for uplink transmission of control information in mobile communication system Processes and kits for determining multi-drug resistance of cells Attachment for flesh piercing jewelry Sheet size setting device, sheet feeder and image forming apparatus Protective device Factorization of overlapping tranforms into two block transforms   Randomly Featured Patents Therapeutic after-shave care lotion Data processing system Method for preparing 6-substituted-7-aza-indoles Valve seal Method for treating limb swelling disorders and the like Semiconductor device and method of manufacturing the same, circuit board, and electronic instrument Adhesively securable fastener Soybean variety D5898941 Shackle mechanisms Serum/clot separation surface determination apparatus © 2006-2008 PatentGenius. All Rights Reserved.