BACKGROUND SIGNAL PROCESSING SYSTEM AND BACKGROUND SIGNAL PROCESSING METHOD

• US 20160179282A1
• Filed: 12/19/2014
• Published: 06/23/2016
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: Apex Material Technology Corp., Imagination Broadway Ltd.
• Original Assignee: Apex Material Technology Corp., Imagination Broadway Ltd.
• Inventors: LEE, Shang-Li
• Granted Patent: US 9,746,961 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A background signal processing method and a background signal processing system are provided. The background signal processing method includes measuring a first conductive wire group, comparing a first background signal measurement value with a predetermined background signal threshold value to determine their difference, and executing the following steps according to the amount of the difference: (1) performing no updating; updating the background signal according to the first background signal measurement value; and further measuring a second conductive wire group and calculating a background signal speculating value of a third conductive wire group, other than the first and second conductive wire groups, based on the second background signal measurement value and the first background signal measurement value, to provide the complete background signals and ensure the quality of the captured signals.

Claims

1. A background signal processing method, which is used in a sensor device having a plurality of conductive wires and a plurality of predetermined background signal threshold and background base signals, the background signal processing method comprising the following steps of:

(1) detecting a first background signal measurement value of a first conductive wire group in the conductive wires according to a first conductive wire number interval, beginning from an n^th conductive wire, wherein n is a positive integer;

(2) determining whether the first background signal measurement value complies with the predetermined first background signal threshold, if yes, stopping in this step, otherwise, proceeding to step (3);

(3) determining whether the first background signal measurement value complies with the predetermined second background signal threshold, if yes, preceding to step (4), otherwise, proceeding to step (5);

(4) updating the background signal;

(5) detecting a second background signal measurement value of a second conductive wire group in the conductive wires according to the first conductive wire number interval, beginning from an (n+m)^th conductive wire, wherein m is a positive integer; and

(6) calculating a background signal speculating value of a third conductive wire group in the conductive wires according to the first background signal measurement value and the second background signal measurement value, wherein the third conductive wire group is derived by excluding the first conductive wire group and the second conductive wire group.

2. The background signal processing method of claim 1, further comprising the step of:

(7) updating a background signal of the sensor device according to the first background signal measurement value, the second background signal measurement value and the background signal speculating value.

3. The background signal processing method of claim 1, further comprising:

(7′

) updating a background signal of the sensor device according to a ratio of the first background signal measurement value, the second background signal measurement value and the background signal speculating value to the background signal value.

4. The background signal processing method of claim 1, wherein step (4) further comprises:

(4-1) calculating a ratio between the first background signal measurement value and the background signal base value; and

(4-2) updating the background signals according to the ratio.

5. The background signal processing method of claim 1, wherein the conductive wires are arranged in an orthogonal manner.

6. The background signal processing method of claim 1, wherein in step (6) the background signal speculating value of the third conductive wire group is calculated by an interpolation method.

7. A background signal processing system, which is used in a sensor device having a plurality of conductive wires and a plurality of predetermined background signal threshold and background base signals, the background signal processing system comprising:

a storage unit that stores the background signal threshold;

a measurement unit that detects a background signal measurement value of the conductive wires; and

a determination module that determines whether the background signal measurement value complies with the background signal threshold.

8. The background signal processing system of claim 7, wherein the sensor device comprises a first background signal threshold and a second background signal threshold that is higher than the first background signal threshold, and the determination module further generates background signal updating information when the background signal measurement value does not comply with the first background signal threshold but complies with the second background signal threshold, and the background signal processing system further comprising a processing unit that updates the background signals after receiving the background signal updating information.

9. The background signal processing system of claim 7, wherein the processing unit further calculates a ratio between the first background signal measurement value and the background signal base value, and updates the background signals according to the ratio.

10. The background signal processing system of claim 7, wherein the sensor device further comprises a first background signal threshold and a second background signal threshold which is higher than the first background signal threshold, the determination module further sends second background signal updating instructions when the background signal measurement value does not comply with the second background signal threshold, and the background signal processing system further comprises a processing unit that updates the background signals after receiving the second background signal updating information.

11. The background signal processing system of claim 7, wherein the conductive wires are arranged in an orthogonal manner.

12. The background signal processing system of claim 7, wherein the measurement unit detects a first background signal measurement value of a first conductive wire group in a plurality of conductive wires according to a first conductive wire number interval, beginning from an n^th conductive wire, and the determination module determines whether the first background signal measurement value complies with the predetermined first background signal threshold;

wherein the determination module, when determining that the first background signal value does not comply with the predetermined first background signal threshold, determines whether the first background signal value complies the predetermined second background threshold;

the measurement unit further detects a second background signal measurement value of a second conductive wire group among the conductive wires according to the first conductive wire number interval, beginning from an (n+m)^th conductive wire, when the first background signal measurement value does not comply with the predetermined second background signal threshold, wherein m is a positive integer, and

the background signal processing system further comprises a calculation module that calculates a background signal speculating value of a third conductive wire group in the conductive wires according to the first background signal measurement value and the second background signal measurement value, wherein the third conductive wire group is derived by excluding the first conductive wire group and the second conductive wire group.

13. The background signal processing system of claim 12, wherein the calculation module calculates the background signal of the third conductive wire group using an interpolation method, so as to obtain the background signal speculating value.