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
Purine compounds used as CB2 agonists
Automatic setup of reflector instances
Single-electron detection method and apparatus for solid-state intensity image sensors with a charge splitting device
Methods and apparatus for deactivating internal constraint curves when inflating an N-sided patch
Washing machine
Non-serialized electronic product registration system and method of operating same
Image display device and capsule endoscope system
  Randomly Featured Patents
Quick change mechanism for circular saw blades and other spinning disc devices
Method for rejuvenating catalysts in hydrodesulfurization of hydrocarbon feedstock
Knockdown, curved hammock stand
Dry electrode system for detection of biopotentials
Sponge holder
Microbiocidal control in the processing of meat-producing four-legged animals
Barbituric acid derivatives as inhibitors of TNF-.alpha. converting enzyme (TACE) and/or matrix metalloproteinases
Method for treating renal disease
Container for semiconductor wafer sample and method of preparing sample
Composite rivet