Method of dynamically adjusting threshold values and related electronic device

• US 9,362,907 B2
• Filed: 11/29/2011
• Issued: 06/07/2016
• Est. Priority Date: 12/01/2010
• Status: Active Grant

• Current Assignee: HTC Corporation
• Original Assignee: HTC Corporation
• Inventors: Juang, Guan-Ching, Tseng, Chi-Jung, Huang, Jen-Hsuen, Lin, Fa-Da
• Primary Examiner(s): Toatley, Gregory J
• Assistant Examiner(s): SUAREZ, FELIX E
• Application Number:
  US13/306,968
• Publication Number:
  US 20120303316A1
• Time in Patent Office: 1,652 Days
• Field of Search: 702/48, 702/55, 702/60, 702/150, 702/179, 702/182, 702/183, 370/392, 710/46, 710/300
• US Class Current: 1/1
• CPC Class Codes: H03K 17/945 Proximity switches H03K17/96 takes precedence
• CPC Class Codes: H03K 2217/94026 Automatic threshold calibration; e.g. threshold automatically adapts to ambient conditions or follows variation of input

Abstract

A method of dynamically adjusting threshold values for an electronic device is disclosed. The method comprises setting the base proximity value to a maximum proximity value; polling a detected proximity value; determining a first range where the detected proximity value falls according to a mapping table; setting the base proximity value to a largest value of the first range; determining a high threshold value and a low threshold value according to the base proximity value; and resetting the base proximity value to a default value when the proximity function is disabled.

Claims

1. A method of adjusting an electronic device having a processing unit and a sensor sensing proximity of an object, the method comprising:

setting a base proximity value to a maximum value in a mapping table by the processing unit;

when a call is received or conducted by the electronic device, enabling a proximity function of the sensor by the processor and generating a detected proximity value by the sensor according to the proximity of the object to the sensor, after enabling the sensor;

determining a first range from the mapping table according to the detected proximity value by the processing unit;

setting the base proximity value to a largest value of the first range by the processing unit;

determining a high threshold value and a low threshold value according to the base proximity value by the processing unit comprising;

setting the high threshold as the base proximity value by adjusting with a high value and setting the low threshold value as the base proximity value by adjusting with a low value; and

determining whether the proximity function of the sensor is disabled, wherein if the proximity function of the sensor is not disabled, the above steps are performed again, wherein if the proximity function of the sensor is disabled, resetting the base proximity value, the low threshold and the low threshold to default values.

2. The method of claim 1, wherein determining the high threshold value and the low threshold value according to the base proximity value comprises setting the high threshold as the base proximity value by addition of a high value and set the low threshold value as the base proximity value by addition of a low value.

3. The method of claim 2, wherein the high value is number six and wherein the low value is number five.

4. The method of claim 2, wherein the mapping table has a plurality of ranges.

5. The method of claim 4, wherein the low value or high value is a fixed value for all ranges.

6. The method of claim 4, wherein the low value or high value is different value in different range in the mapping table.

7. The method of claim 2, wherein the low value or high value is polynomial of the base proximity value.

8. The method of claim 5, wherein range of the plurality of ranges is set by using polynomial.

9. The method of claim 1, further comprising establishing the mapping table.

10. The method of claim 9, wherein establishing the mapping table comprising defining a plurality of ranges in the mapping table.

11. An electronic device comprising:

an application unit for enabling a proximity function;

a sensor coupled to the application unit, for sensing an object around the electronic device and generating a detected proximity value; and

a processing unit coupled to the sensor, for executing a process to adjust threshold values; and

a memory coupled to the processing unit for storing a mapping table, the detected proximity value, a base proximity value, a high threshold value and a low threshold value;

wherein the process comprise;

setting the base proximity value to a maximum value in the mapping table by the processing unit;

when a call is received or conducted by the electronic device, enabling the proximity function of the sensor by the processor and generating the detected proximity value by the sensor according to the proximity of the object to the sensor, after enabling the sensor;

determining a first range from the mapping table according to the detected proximity value by the processing unit;

setting the base proximity value to a largest value of the first range by the processing unit;

determining the high threshold value and the low threshold value according to the base proximity value by the processing unit,

setting the high threshold as the base proximity value by adjusting with a high value and setting the low threshold value as the base proximity value by adjusting with a low value; and

determining whether the proximity function of the sensor is disabled, wherein if the proximity function of the sensor is not disabled, the above steps are performed again, wherein if the proximity function of the sensor is disabled, resetting the base proximity value, the low threshold and the low threshold to default values.

12. The electronic device of claim 11, wherein process of determining the high threshold value and the low threshold value according to the base proximity value comprises setting the high threshold as the base proximity value by addition of a high value and set the low threshold value as the base proximity value by addition of a low value.

13. The electronic device of claim 11, wherein the high value is number six and wherein the low value is number five.

14. The electronic device of claim 11, wherein the process further comprises determining whether to disable the proximity function.

15. The electronic device of claim 11, wherein the process further comprises establishing the mapping table.

16. The electronic device of claim 11, wherein the mapping table comprises a plurality of ranges.