Four-stage phase demodulation low frequency wireless mouse devic

Details Four-stage phase demodulation low frequency wireless mouse devic Four-stage phase demodulation low frequency wireless mouse devic

1997-07-15

2000-05-16

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375349, 345163, 329304, 329345, H03D 322, H04L 2722

Patent

active

060647027

ABSTRACT:
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.degree., 90.degree., 180.degree. and 270.degree. 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.

REFERENCES:
patent: 3800228 (1974-03-01), Acker
patent: 5235424 (1993-08-01), Wagner et al.

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