Transmitter and receiver for use in a wireless cursor control system
AssigneeKye Systems Corp.
InventorPo-Hsun Hsien
Life of this patent
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Abstract
A wireless cursor control system is provided that includes a pointing device and a receiver. The pointing device has a controller for receiving user input and for providing a control signal, and a transmitter that includes an antenna and a high frequency modulator coupled to the controller for receiving the control signal and for generating an output signal for transmission via the antenna. The high frequency modulator includes a variable frequency modulator circuit for selectively changing the frequency deviation of the control signal, and a high frequency circuit for increasing the frequency deviation of the control signal to produce the output signal. The receiver has an antenna that receives the output signal, and a demodulation circuit for demodulating the received output signal.
Claims22
A cursor control device comprising:
- an encoder for generating position information regarding the cursor pointing device;
- a button circuit for receiving user activated button signals;
- a controller coupled to the encoder and the button circuit for receiving the position information and button signals, respectively, and responsive thereto for generating a control signal;
- and
- a high frequency modulator coupled to the controller for receiving the control signal and generating an output signal to be transmitted to a receiver, said high frequency modulator including:
- a variable frequency modulator circuit having a switching transistor that is selectively turned on or off to select between one of only two predetermined frequency deviations of the control signal;
- and
- a high frequency circuit for increasing the frequency deviation of the control signal;
- wherein the variable frequency modulator circuit further includes a first capacitor and a second capacitor that are in parallel when the switching transistor is turned on.
A wireless cursor control system comprising:
- (a) a pointing device having a controller for receiving user input and for providing a control signal, and a transmitter that includes an antenna and a high frequency modulator coupled to the controller for receiving the control signal and generating an output signal for transmission via the antenna, said high frequency modulator including:
- a variable frequency modulator circuit having a switching transistor that is selectively turned on or off to select between one of only two predetermined frequency deviations of the control signal;
- and
- a high frequency circuit for increasing the frequency deviation of the control signal to produce the output signal;
- and
- (b) a receiver having an antenna that receives the output signal, and a demodulation circuit for demodulating the received output signal;
- wherein the variable frequency modulator circuit further includes a first capacitor and a second capacitor that are in parallel when the switching transistor is turned on.
A cursor control device comprising:
- an encoder for generating position information regarding the cursor pointing device;
- a button circuit for receiving user activated button signals;
- a controller coupled to the encoder and the button circuit for receiving the position information and button signals, respectively, and responsive thereto for generating a control signal;
- and
- a high frequency modulator coupled to the controller for receiving the control signal and generating an output signal to be transmitted to a receiver, said high frequency modulator including:
- a variable frequency modulator circuit having a switching transistor that is selectively turned on or off to select between one of only two predetermined frequency deviations of the control signal;
- and
- a high frequency circuit for increasing the frequency deviation of the control signal;
- wherein the variable frequency modulator circuit further includes a first capacitor, a second capacitor, and an inductor, with the switching transistor coupled via the first capacitor to a junction between the second capacitor and the inductor.
A wireless cursor control system comprising:
- (a) a pointing device having a controller for receiving user input and for providing a control signal, and a transmitter that includes an antenna and a high frequency modulator coupled to the controller for receiving the control signal and generating an output signal for transmission via the antenna, said high frequency modulator including:
- a variable frequency modulator circuit having a switching transistor that is selectively turned on or off to select between one of only two predetermined frequency deviations of the control signal;
- and
- a high frequency circuit for increasing the frequency deviation of the control signal to produce the output signal;
- and
- (b) a receiver having an antenna that receives the output signal, and a demodulation circuit for demodulating the received output signal;
- wherein the variable frequency modulator circuit further includes a first capacitor, a second capacitor, and an inductor, with the switching transistor coupled via the first capacitor to a junction between the second capacitor and the inductor.
Dependencies are inferred from the claim text.