公开(公告)号：US09170693B2

公开(公告)日：2015-10-27

申请号：US14085934

申请日：2013-11-21

Applicant: PIXART IMAGING INC.

Inventor： Tom Murphy ,  Hsin-Chia Chen ,  William Han ,  Raman Sahgal

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416

Abstract: There is provided a capacitive touch system including a gain control unit sequentially receiving a plurality of digital detected signals of a detection frame. The gain control unit includes a gain buffer and a control circuit. The gain buffer is configured to store a current gain sheet. The control circuit calculates a first gain sheet according to a setpoint and the digital detected signals of the detection frame, compares a current roughness of the current gain sheet with a first roughness of the first gain sheet and replaces the current gain sheet in the gain buffer by the first gain sheet when the first roughness is flatter than the current roughness.

Abstract translation: 提供了一种电容式触摸系统，其包括依次接收检测帧的多个数字检测信号的增益控制单元。 增益控制单元包括增益缓冲器和控制电路。 增益缓冲器配置为存储当前增益表。 控制电路根据设定点和检测帧的数字检测信号来计算第一增益片，将当前增益片的当前粗糙度与第一增益片的第一粗糙度进行比较，并将增益缓冲器中的当前增益片代替 当第一粗糙度比当前粗糙度更平坦时，通过第一增益片。