Electronic device, signal compensation device and signal compensation method

Abstract

An electronic device that prevents a failure caused by a temperature drift of an angular velocity sensor, and a signal compensation system and a signal compensation method for compensating for the temperature drift are provided. The present invention provides a mechanism including an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity. The device stores in advance data of a second signal normally output by the angular velocity sensor while in a stationary state, detects a stationary state and extracts the difference between the first and second signals when the stationary state is detected. The device thereby compensates for the first signal based on the extracted difference signal. A display unit in the device scrolls an image based on the compensated signal. This prevents a failure caused by the temperature drift of the angular velocity sensor.

1. An electronic device, comprising:
 an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity of the electronic device; 
 means for storing in advance data of a second signal normally output by the angular velocity sensor at a predetermined temperature when the angular velocity sensor is in a stationary state; 
 means for detecting the stationary state of the angular velocity sensor; 
 means for extracting as a difference signal the difference between the first signal and the second signal; 
 means for adjusting the first signal based on the extracted difference signal; and 
 a display unit that scrolls and displays an image based on the adjusted signal. 
 
     
     
       2. An electronic device according to  claim 1 , wherein the stationary-state detecting means comprises an acceleration sensor that is used to detect a velocity component and a displacement component in a predetermined movement direction of the electronic device. 
     
     
       3. An electronic device, comprising:
 an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity of the electronic device; 
 means for storing in advance data of a second signal normally output by the angular velocity sensor at a predetermined temperature when the angular velocity sensor is in a stationary state; 
 a button; 
 means for extracting as a difference signal the difference between the first signal and the second signal when the button is pressed; 
 means for adjusting the first signal based on the extracted difference signal; and 
 a display unit that scrolls and displays an image based on the adjusted signal. 
 
     
     
       4. A signal compensation device, comprising:
 an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity of the device; 
 means for storing in advance a second signal normally output by the angular velocity sensor at a predetermined temperature when the angular velocity sensor is in a stationary state; 
 means for detecting the stationary state of the angular velocity sensor; 
 means for extracting as a difference signal the difference between the first signal and the second signal; and 
 means for adjusting the first signal based on the extracted difference signal. 
 
     
     
       5. A signal compensation device, comprising:
 an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity of the device; 
 means for storing in advance data of a second signal normally output by the angular velocity sensor at a predetermined temperature when the angular velocity sensor is in a stationary state; 
 a button; 
 means for extracting as a difference signal the difference between the first signal and the second signal when the button is pressed; and 
 means for adjusting the first signal based on the extracted difference signal. 
 
     
     
       6. A signal compensation method, comprising:
 detecting a stationary state; 
 reading a first signal output from an angular velocity sensor; 
 reading data of a second signal from a storage device, the data of the second signal being normally output by the angular velocity sensor at a predetermined temperature when the angular velocity sensor is in a stationary state; 
 extracting as a difference signal the difference between the read first signal and the second signal; and 
 adjusting the first signal based on the extracted difference signal. 
 
     
     
       7. An electronic device, comprising:
 an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity of the electronic device; 
 a storage unit operable to store in advance data of a second signal normally output by the angular velocity sensor at a predetermined temperature when the angular velocity sensor is in a stationary state; 
 a detector operable to detect the stationary state of the angular velocity sensor; 
 an extracting unit operable to extract as a difference signal the difference between the first signal and the second signal; and 
 a compensating unit operable to adjust the first signal based on the extracted difference signal. 
 
     
     
       8. An electronic device according to  claim 7 , further comprising a display unit that scrolls and displays an image based on the adjusted signal. 
     
     
       9. An electronic device, comprising:
 an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity;   a memory for storing, as a function of temperature, data of a second signal output by the angular velocity sensor that is in a stationary state; and   a processor operable to read, in accordance with a certain temperature, the data of the second signal from the memory and calculate compensation data for adjusting for the first signal using the read data.   
     
     
       10. The electronic device according to claim 9, the processor further operable to compensate for the first signal based on the compensation data. 
     
     
       11. The electronic device according to claim 10, the processor further operable to calculate a displacement caused by a spatial movement based on the compensated first signal. 
     
     
       12. The electronic device according to claim 11, the processor further operable to transmit information for scrolling an image based on the calculated displacement. 
     
     
       13. The electronic device according to claim 12, further comprising a screen for displaying an image scrolling, based on the transmitted information. 
     
     
       14. A signal compensation device, comprising:
 an angular velocity sensor that outputs a first signal in accordance with a rotational angular velocity;   a button;   a memory for storing, as a function of temperature, data of a second signal output by the angular velocity sensor that is in a stationary state; and   a processor operable to read, when the button is pressed, the data of the second signal from the memory and calculate compensation data for adjusting the first signal using the read data.   
     
     
       15. The signal compensation device of claim 14, wherein the processor is further operable to calculate, when the button is pressed, the data for compensating for the first signal using data of the first signal output by the angular velocity sensor and the data of the second signal stored in the memory. 
     
     
       16. The signal compensation device according to claim 14, wherein the processor is further operable to calculate, as the data for compensating for the first signal, a difference between the first signal output by the angular velocity sensor and the second signal stored by the memory, when the button is pressed. 
     
     
       17. The signal compensation device according to claim 16, wherein the processor is further operable to calculate a displacement caused by a spatial movement based on the compensated first signal. 
     
     
       18. The signal compensation device according to claim 17, wherein the processor is further operable to transmit information for scrolling an image based on the calculated displacement. 
     
     
       19. The signal compensation device according to claim 18, the processor further operable to transmit information for scrolling an image based on the calculated displacement. 
     
     
       20. The electronic device according to claim 19, further comprising a screen for displaying an image scrolling, based on the transmitted information. 
     
     
       21. A signal compensation method, comprising the steps of:
 reading a first signal output by an angular velocity sensor;   storing, as a function of temperature, data of a second signal output by the angular velocity sensor that is in a stationary state;   reading, in accordance with a certain temperature, the data of the second signal; and   calculating compensation data for adjusting the first signal based on the read data of the second signal.   
     
     
       22. A signal compensation method according to claim 21, further comprising the step of compensating the first signal based on the compensation data. 
     
     
       23. The signal compensation method according to claim 22, wherein, in the step of calculating compensation data, a difference between the first signal output by the angular velocity sensor and the second signal, when the stationary state is detected. 
     
     
       24. The signal compensation method according to claim 23, wherein, in the step of detecting a stationary state, the stationary state is detected based on a magnitude of a value output by an acceleration sensor.