Resources Contact Us Home
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
Computer product, information retrieval method, and information retrieval apparatus
Method for encoding signal, and method for decoding signal
Methods and apparatuses for configuring and operating graphics processing units
3,7-diamino-10H-phenothiazine salts and their use
Information processing using batch setting information
Systems and methods for assigning a template to an existing network configuration
Method of fabricating a solar cell with a tunnel dielectric layer
  Randomly Featured Patents
Organic EL element, method for manufacturing the same, and organic EL lighting apparatus
Method of installing prefabricated, segment concrete filled tube members
Interferon-alpha polypeptides and conjugates
Denim jean bean bag seat cushion
CT scanner and method for helical scanning of an examination object which has at least one portion undergoing periodic motion
Pump motor/basket brake for an automatic washer
Ultrasonic rotary horn
Telescoping spring probe
Drying process of viscous solution containing (meth)acrylic acid-based polymer
Most accurate method of tensioning threaded fasteners in assembled units