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
Disposable and tamper-resistant RFID lock
Manufacturing method power semiconductor device
Performance monitoring of advanced process control systems
Display screen or portion thereof with icon
System or method to assist and automate an information security classification and marking process for government and non-government organizations for information of an electronic document
Cylindrical lithium secondary battery comprising a contoured center pin
Systems, methods, and apparatus to determine physical location and routing within a field of low power beacons
  Randomly Featured Patents
Technique for bypassing an IP PBX
Voltage-sensed system and method for anti-islanding protection of grid-connected inverters
Method for predicting dynamic behavior characteristics of a vehicle using screw theory
Absorbent mixture and product
Indirect mobile codes with flexible formats
Thin-film coating apparatus
Oscillating magnetic field generating assembly
Mushroom harvesting machine
Stackable container
Autonomous robot