Active Stylus Synchronization via Signal Edge Timing

The patent introduces an intermediary synchronization routine that mediates between the touch sensor controller and the active stylus. This routine acts as a buffer layer that processes synchronization signals, filtering out noise and interference while maintaining accurate timing coordination. The intermediary routine translates raw synchronization signals into reliable timing information for both devices.

The synchronization routine implements feedback mechanisms where the touch sensor controller and active stylus continuously exchange timing information. Each device monitors the synchronization signals and adjusts its operation based on received feedback, ensuring that timing remains synchronized even in the presence of noise. The system uses feedback to detect and correct synchronization drift caused by interference.

The synchronization routine is established and parameters are determined in advance, before actual data transmission begins. The touch sensor controller and active stylus perform preliminary synchronization handshaking to establish timing relationships, data rates, and frequency parameters. This preliminary action ensures that when data transmission occurs, the devices are already synchronized, reducing the need for complex real-time analysis.

The synchronization routine dynamically adjusts parameters such as sampling frequency, data rate, and timing offsets based on the detected signal characteristics. By changing parameters adaptively, the system maintains reliable data transmission across different operating conditions without requiring overly complex fixed-structure synchronization logic.