Touch Controller Timing Sync Using Stylus Downlink Phase Feedback

The patent introduces the downlink signal as an intermediary mechanism for synchronization. Instead of relying solely on the uplink signal from the touch controller, the system uses the downlink signal transmitted from the stylus to the touch controller as a mediator to maintain synchronization. This intermediary approach allows the system to cross-validate timing information and reduces susceptibility to interference in either direction.

The patent implements a feedback mechanism where the touch controller continuously monitors the downlink signal timing and adjusts synchronization parameters accordingly. The system measures the timing offset between expected and actual downlink signal reception and uses this feedback to dynamically adjust the synchronization timing, creating a self-correcting system that compensates for interference and signal variations.

The patent performs preliminary actions by pre-establishing expected timing parameters and signal characteristics before actual synchronization occurs. The system pre-calculates timing expectations based on configured parameters and uses these pre-established values as reference points for rapid comparison during operation, reducing the computational burden of real-time analysis while maintaining high precision.

The patent utilizes parameter changes by dynamically adjusting synchronization timing parameters based on measured timing offsets and phase shifts. The system modifies timing parameters such as sampling moments and signal expectation times according to the detected deviations, allowing the system to adapt to varying conditions without requiring overly complex processing architecture.