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US 12,585,356 B2Granted
Stylus sensing circuit and stylus
AssigneeNovatek Microelectronics Corp.
InventorsTing-Yu Chan, Yun-Hsiang Yeh, Chi-Te Lin
Life of this patent
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Abstract
A stylus sensing circuit includes a receiving circuit, a demodulation circuit and a detection circuit. The receiving circuit receives a downlink signal from a stylus, wherein the downlink signal includes a plurality of frequency signals. The demodulation circuit, coupled to the receiving circuit, demodulates the downlink signal to extract each of the plurality of frequency signals. The detection circuit, coupled to the demodulation circuit, chooses one of the plurality of frequency signals to perform a signal processing.
Claims24
A stylus sensing circuit comprising:
- a receiving circuit to receive a downlink signal from a stylus, the downlink signal comprising a plurality of frequency signals;
- a demodulation circuit, coupled to the receiving circuit, to demodulate the downlink signal to extract each of the plurality of frequency signals;
- and
- a detection circuit, coupled to the demodulation circuit, to receive the plurality of frequency signals from the demodulation circuit and choose one of the plurality of frequency signals to perform a signal processing, and ignore another one of the plurality of frequency signals which is determined to be interfered with by a noise.
1 more element
A stylus comprising:
- a plurality of signal generators to generate a plurality of frequency signals having different frequencies;
- and
- a mixer, coupled to the plurality of signal generators, to combine the plurality of frequency signals to generate a downlink signal;
- wherein a first frequency signal and a second frequency signal among the plurality of frequency signals carry a same information;
- wherein the downlink signal is received by a stylus sensing circuit, and the stylus sensing circuit comprises a demodulation circuit for demodulating the downlink signal to extract each of the plurality of frequency signals;
- wherein the stylus sensing circuit comprises a detection circuit for receiving the plurality of frequency signals from the demodulation circuit and choosing one of the plurality of frequency signals to perform the signal processing and ignoring another one of the plurality of frequency signals determined to be interfered with by the noise.
3 more elements
Dependencies are inferred from the claim text.