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
Real-image zoom viewfinder and imaging apparatus
Tri-material dual-species neutron spectrometer
Digital photographing apparatus and control method for evaluating validity of an auto-focus operation
Laminar library screen
Methods, systems and computer program products for importing data from an edge router to a network management system
Resist composition and method for producing resist pattern
Semiconductor device and method of manufacturing the same
  Randomly Featured Patents
Oil catching boom
Combination square, scribing tool and plumb level
Information processing apparatus with movable spindle shafts
Intensive care equipment carriage
Methods and systems for in situ calibration of imaging in biological analysis
Electric toy motor
Reduced time constant charge pump and method for charging a capacitive load
Method, system, and device for deploying a containment boom
Electronic air cleaner
One-bit frequency-shift-keyed modulator