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
Methods and systems for representing missed approach information in perspective view on a cockpit display
Decision management system and method
Proximity-based mobile message delivery
Method of inspecting wafer
Systems and methods for analyzing telecommunications invoices for payment
System and method for providing security in browser-based access to smart cards
Ionic compound, anti-static pressure-sensitive adhesive and polarizer comprising the same
  Randomly Featured Patents
Methods of modeling an integrated noise in an image sensor and methods of reducing noise using the same
Field stripping key punch
Substituted amides having antiinflammatory activity and intermediates
Process for the preparation of 5,6-dihydroxy-2-amino-1,2,3,4-tetrahydronaphthalene derivatives
Field emission device
Semiconductor test system
Passivation of integrated circuits containing ferroelectric capacitors and hydrogen barriers
Tension bar
Bottle
Method for improving the water absorption of polyester fibers