Stylus to host synchronization using a magnetic field
AssigneeWacom Co., Ltd.
InventorsViktor Kremin, Andriy Ryshtun
Life of this patent
Estimating the term…
Abstract
A system and method for synchronizing a stylus to a capacitive sense array. The system including a capacitive sense array which includes a plurality of electrodes. A magnetic field is generated using the plurality of electrodes. The magnetic field is used to synchronize the operation of the stylus and the capacitive sense array.
Claims16
A signal processing device that is used with an active stylus which transmits a stylus transmission signal, and that is configured to be coupled to a sensor array, the signal processing device comprising:
- a signal generator configured to generate a first sensor transmission signal that is transmitted via the sensor array, wherein the first sensor transmission signal is transmitted to the active stylus via the sensor array and is distinguishable from the stylus transmission signal in signal types, the stylus transmission signal being modulated based on at least one of amplitude, frequency, phase, or a first code;
- and
- a processor coupled to the signal generator and configured to:
- transmit the first sensor transmission signal to the active stylus via the sensor array, the first sensor transmission signal synchronizing a timing of the stylus transmission signal to the first sensor transmission signal, so that the stylus transmission signal is transmitted responsive to the first sensor transmission signal and a time interval of the stylus transmission signal does not overlap a time interval of the first sensor transmission signal;
- and
- detect the active stylus from first signals received via the sensor array in response to the stylus transmission signal.
A signal processing device that is used with an active stylus which transmits a stylus transmission signal, and that is configured to be coupled to a sensor array, the signal processing device comprising:
- a signal generator configured to generate a first sensor transmission signal that is transmitted via the sensor array, wherein the first sensor transmission signal is transmitted to the active stylus via the sensor array and is distinguishable from the stylus transmission signal in signal types, the stylus transmission signal being modulated based on at least one of amplitude, frequency, phase, or a first code, and
- a processor coupled to the signal generator and configured to:
- transmit the first sensor transmission signal to the active stylus via the sensor array to synchronize a timing of the stylus transmission signal to the first sensor transmission signal, so that the stylus transmission signal is transmitted responsive to the first sensor transmission signal;
- and
- detect the active stylus from first signals received via the sensor array in response to the stylus transmission signal while a time interval of the first sensor transmission signal that synchronizes a timing of the stylus transmission signal to the first sensor transmission signal overlaps a time interval of the stylus transmission signal transmitted from the active stylus.
Dependencies are inferred from the claim text.