Patent ID: 9448670
Filing Date: 2016-09-20
CPC Classification: G06F

Claim Text:
1. A method of operating a system having a screen disposed above a grid comprising horizontal conductive lines and vertical conductive lines, the horizontal conductive lines coupled to respective driving lines and the vertical conductive lines coupled to respective sensing lines, the method comprising: transmitting first signals on the driving lines in a first time interval of a periodic cycle; receiving second signals on the sensing lines in response to the first signals in the first time interval of the periodic cycle; tuning a receiver filter based on a transmit frequency of the first signals prior to receiving the second signals; processing the second signals to detect the presence of a conductive object in contact with the screen and an active stylus in proximity to the screen; if the active stylus is detected in proximity to the screen, receiving third signals on the driving lines and the sensing lines in a second time interval of the periodic cycle; and tuning the receiver filter based on a transmit frequency of the detected active stylus prior to receiving the third signals.