International Business Machines Corporation

Pixart Imaging Incorporated

J.w. Associates

Jerome D Wong

Mercedes E Gil

Zhi Zhong Huang

Xiao Yan Zheng

Larry J Schmier

Richard G Greever

Xu Zhang

Mark E Clark

Various embodiments of a low-power-consumption analog-to-digital converter ('ADC') for a touchscreen or touch panel in a capacitive sensing system are disclosed. The ADC is configured to operate in a first mode or a second mode. The first mode is characterized by a first resolution having a first number of ADC bits and a first level of power consumption associated therewith. The second mode is characterized by a second resolution having a second number of bits and a second level of power consumption associated therewith. The ADC operates under control of the controller and is configured such that the first number of bits is greater than the second number of bits and the first power level is greater than the second power level. The controller causes the ADC to switch from operating in the first mode to operating in the second mode when low radio frequency (RF) noise conditions are detected by sense circuitry, the ADC and/or the controller.

Controller and ADC for low power operation of touchscreen device

Embodiments of the invention achieve increased compression of audio data in comparison to prior art ADPCM compression schemes using modest processing power and resources. For one embodiment, an asymmetric ADPCM encoding scheme is implemented to increase apparent encoding resolution for a specified number of encoding bits. Additionally, or alternatively, such techniques as pattern recognition and encoding, as well as calculation simplification, are employed to increase data compression of audio data.

Systems and methods for sound compression

A method and apparatus for detecting and analyzing errors in a communications system is described. The method employs expert system techniques to isolate failures to specific field replaceable units and provide detailed messages to guide an operator to a solution. The expert system techniques include detailed decision trees designed for each resource in the system. The decision trees also filter extraneous sources of errors from affecting the error analysis results.

Expert system for processing errors in a multiplex communications system

Growing community of inventors

Sunnyvale, CA, United States of America

Jerome D Wong