Transmitter and receiver for use in a wireless cursor control system
First Claim
1. 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.
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Accused Products
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.
53 Citations
22 Claims
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1. A cursor control device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20)
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10. A wireless cursor control system comprising:
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(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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 22)
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19. A cursor control device comprising:
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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.
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21. A wireless cursor control system comprising:
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(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.
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Specification