| CPC G06F 3/04162 (2019.05) [G06F 3/03545 (2013.01); G06F 3/0383 (2013.01); G06F 3/0442 (2019.05); G06F 3/0446 (2019.05)] | 8 Claims |
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1. An active stylus receiving circuit for receiving vector data signal transmitted by an active stylus, the vector data signal carrying vector data including in-phase data and quadrature data, the active stylus receiving circuit comprising:
an analog-to-digital converter for sampling and converting the vector data signal into digital signal with a plurality of sampling points;
an interpolation circuit for performing interpolating operation on the digital signal to increase the number of sampling points representing the digital signal so as to generate interpolated digital signal; and
a demodulation circuit for performing demodulating operation on the interpolated digital signal to generate demodulated in-phase data and demodulated quadrature data, so as to obtain demodulated vector data, wherein the digital signal generated after the interpolation circuit performs interpolating operation is:
 where Y( ) represents interpolated digital signal, X( ) represents digital signal outputted by the analog-to-digital converter, and floor( ) represents a floor function.
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