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
Semiconductor device and method of manufacturing the same
Probe for ultrasound diagnostic apparatus
Transaction cost recovery queue management
Imaging apparatus, control method thereof, and program
Method and mobile device for awareness of language ability
Gas flow indicator
Sequential control device for a striking mechanism
  Randomly Featured Patents
Break-away cleat assembly for athletic shoe
Buckleless belt
Amide derivative
Discrete filter, sampling mixer, and radio device
Network device case
Imaging, diagnosis and treatment of disease
Apparatus and method for writing data onto rewritable optical media
Method for thermal transfer recording of multicolor image
System and method for short range communication using adaptive channel intervals
Controlling protein levels in eucaryotic organisms