Electronic device, signal compensation device and signal compensation method

• US 7,225,101 B2
• Filed: 08/22/2003
• Issued: 05/29/2007
• Est. Priority Date: 08/28/2002
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Miyazaki, Eiji, Usuda, Hiroshi, Yamachika, Shinji
• Primary Examiner(s): Barlow; John
• Assistant Examiner(s): Kundu; Sujoy
• Application Number:
  US10/493,403
• Publication Number:
  US 20050071118A1
• Time in Patent Office: 1,376 Days
• Field of Search: 702/141
• US Class Current: 702/141
• CPC Class Codes: G01C 19/00 Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects

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.

Claims

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.