| CPC G06F 3/0383 (2013.01) [G06F 3/016 (2013.01); G06F 3/03545 (2013.01); G06F 2218/08 (2023.01)] | 20 Claims |
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1. A position detection system, comprising:
an active pen; and
a sensor controller that communicates with the active pen,
wherein, after the active pen has established pairing with the sensor controller, the active pen transmits a plurality of downlink signals during a fixed frame cycle in which an uplink signal is transmitted by the sensor controller,
wherein a transmission start timing of the downlink signals is based on a local identifier assigned using a communication protocol,
wherein the downlink signals include a first downlink signal and a second downlink signal,
wherein transmission of the first downlink signal starts after a first predetermined time interval has elapsed from a start of transmission of the uplink signal,
wherein transmission of the second downlink signal starts after a second predetermined time interval has elapsed from a start of transmission of the first downlink signal, and
wherein the sensor controller, in operation, detects a position of the active pen and receives data transmitted from the active pen during the fixed frame cycle in which the uplink signal is transmitted by the sensor controller.
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