| 摘要 |
A four-stage phase demodulation low frequency wireless mouse device is disclosed, improving a shortcoming of a conventional low frequency wireless mouse device which can not effectively overcome the signal interference and prevent the misoperations by only using I and Q axes or a quadrature demodulation method and the present invention installs a phase demodulation circuit on a receiving end for generating four sets of phase signals each having a phase of 0 DEG , 90 DEG , 180 DEG and 270 DEG respectively. Then, each of the quadrature signals is sent into a microprocessor for processing to become a computer interfacing signal after passing through a low pass filter, a detecting circuit and a voltage comparator respectively so that the signal interference is effectively eliminated, the misoperation is obviated and the reaction speed of the signal is enhanced due to a low error rate.
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