Optical pointing system and method for controlling power and/or clock signal thereof
First Claim
1. An optical pointing system comprising:
- a movement speed sensing unit for calculating a movement speed using a movement value; and
a variable power unit for varying a magnitude of power supply voltage according to the movement speed,wherein the variable power unit includes;
a power setting part for outputting a power setting value which is set in correspondence to the movement speed; and
a power converting part for converting the power setting value into power supply voltage.
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Accused Products
Abstract
Disclosed are an optical pointing system and method for controlling power and/or clock signal thereof. The optical pointing system includes a movement speed sensing unit for calculating a movement speed using a movement value, a variable power unit for varying a magnitude of power supply voltage according to the calculated movement speed, and a variable clock signal generating unit for adaptively varying an operating speed of a circuit by varying a frequency of a supplied clock signal according to the calculated movement speed. Thus, it is possible to reduce power consumption by adaptively varying the operating speed of the circuit based on the magnitude of the supplied power and/or the frequency of the clock signal according to the movement speed.
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Citations
10 Claims
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1. An optical pointing system comprising:
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a movement speed sensing unit for calculating a movement speed using a movement value; and a variable power unit for varying a magnitude of power supply voltage according to the movement speed, wherein the variable power unit includes; a power setting part for outputting a power setting value which is set in correspondence to the movement speed; and a power converting part for converting the power setting value into power supply voltage. - View Dependent Claims (2, 3)
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4. An optical pointing system comprising:
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a movement speed sensing unit for calculating a movement speed using a movement value; a variable power unit for varying a magnitude of power supply voltage according to the movement speed; and a variable clock signal generating unit for varying a frequency of a clock signal according to the movement speed wherein the variable clock signal generating unit includes; a counter setting part for outputting at least one counter setting value which is set in correspondence to the movement speed; and a frequency converting part for converting the frequency of the clock signal using the counter setting value. - View Dependent Claims (5, 6, 7)
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8. A method for controlling power and clock signal of an optical pointing system, the method comprising:
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a calculating step of calculating a movement speed using a movement value; and a power and frequency varying step of changing a magnitude of the power supply voltage and a frequency of the clock signal according to the movement speed wherein the power and frequency varying step includes; a setting step of setting a power setting value and a counter setting value corresponding to the movement speed; and an outputting step of outputting the power of a magnitude corresponding to the power setting value and the clock signal of a frequency corresponding to the counter setting value.
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9. An optical pointing system comprising:
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a movement speed sensing unit for calculating a movement speed using a movement value; a variable power unit for varying a magnitude of power supply voltage according to the movement speed; a variable clock signal generating unit for varying a frequency of a clock signal according to the movement speed; an image sensor for sensing light reflected from an object to generate an analog image signal; an A/D converter for receiving the analog image signal outputted from the image sensor and converting the received analog image signal into a digital signal; a movement value calculator for calculating a movement value from the digital signal outputted from the A/D converter; and a microcontroller for processing the movement value and input information. - View Dependent Claims (10)
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Specification