Broadcom Corporation

Lsi Corporation

Satish Vithal Joshi

David A Sobel

Federico Santiago Cattivelli

Tianhao Li

John S Walley

Sumant Ranganathan

Pi Sheng Chang

Kourosh Soroushian

Bhupesh Kharwa

Glen Weaver

Kerrynn Jacques De Roche

K Metin Uz

Adaptive reconfiguration of a capacitive touch controller is implemented by estimating the interference spectrum of the signal received by the touch controller. The spectrum of the received signal is used to determine a desired frequency, and the touch panel transmitter is configured to use that desired frequency. The spectrum of the received signal is also used to determine an desired filter transfer function. A filter in the touch panel received signal path is configured to use that desired filter transfer function. The adaptive reconfiguration is focused on improving the signal to noise ratio of the received signal without the need for shielding the touch panel, performing additional scans of the touch panel, or using components that operate at higher power levels.

Interference estimation and adaptive reconfiguration of a capacitive touch controller

Control circuitry for a touch panel includes a touch panel interface, a memory comprising touch positioning logic, and a controller in communication with the memory and the touch panel interface. The controller is operable, when the touch positioning logic is executed, to perform selected processing of the touch panel, including scanning a touch panel and determining a touch panel blob resulting from a touch, obtaining blob characteristics of the touch panel blob, and determining a position of the blob relative to the touch panel based on the blob characteristics. The blob characteristics can be adjusted to more accurately position the blob in circumstances where the blob is located near the edge of the touch panel, is in close proximity to another blob, or when the touch panel has variation in the received signal noise.

High-accuracy touch positioning for touch panels

A method for a touch panel control circuit includes stimulating a touch panel and receiving signals responsive to the stimulating. Based on the received signals, water or another contaminant may be determined to be present on the touch panel. While the contaminant is present on the touch panel, a wet baseline mode of operation in which a different baseline value is used to detect a touch condition for the touch panel. When the contaminant is removed, operation returns to a dry baseline mode.

Waterproof baseline tracking in capacitive touch controllers

An apparatus generally including a first circuit and a second circuit is disclosed. The first circuit may be configured to generate an intermediate bitstream by parsing a Joint Picture Expert Group (JPEG) bitstream carrying a picture. The intermediate bitstream generally includes one or more encoded frames each representing a portion of the picture. The second circuit may be configured to (i) generate one or more intermediate images by decoding the encoded frames and (ii) recreate the picture using the intermediate images.

Decoding a progressive JPEG bitstream as a sequentially-predicted hybrid video bitstream

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Cupertino, CA, United States of America

Satish Vithal Joshi