KR20080082435A - Mobile terminal apparatus - Google Patents

Abstract

A mobile terminal apparatus (10) has a function for detecting a movement added by a user. The mobile terminal apparatus (10) comprises an acceleration sensor (12) for sensing accelerating components of the three axis directions; a tilt angle calculating part (16) for calculating, based on the accelerating components of the three axis directions sensed by the acceleration sensor (12), a tilt angle of the mobile terminal apparatus (10); a tilt angle storing part (18) for storing the tilt angle calculated by the tilt angle calculating part (16); an acceleration data processing part (22) for correcting, by use of the tilt angle stored in the tilt angle storing part (18), the acceleration data of at least two axis directions, which are sensed by the acceleration sensor (12), into acceleration data of the attitude serving as a criterion of the mobile terminal apparatus (10) after the calculation of the tilt angle and for processing the thus corrected acceleration data into a processed data; a reference data storing part (28) that stores reference data corresponding to a plurality of movements of the mobile terminal apparatus (10) exhibiting the criterion attitude; and a detecting part (30) that refers to the reference data stored in the reference data storing part (28) and detects a movement corresponding to the processed data as corrected and processed by the acceleration data processing part (22).

Description

Mobile terminal apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal device such as a mobile phone, and more particularly to a portable terminal device having an acceleration sensor.

As an input device of a portable terminal device such as a cellular phone, a keypad, a touch screen, voice recognition, and the like have been put to practical use. In recent years, a portable terminal apparatus capable of scrolling the screen display of the portable terminal apparatus by mounting an acceleration sensor and detecting an inclination angle of the portable terminal apparatus has been proposed (for example, International Publication No. 04/020951 pamphlet).

MEANS TO SOLVE THE PROBLEM This inventor examined the portable terminal apparatus which can detect the movement of the three-dimensional space applied by a user, and can input a character etc. as an application example of the portable terminal apparatus equipped with the acceleration sensor. The portable terminal device registers the acceleration information when the movement is applied to the portable terminal device as reference data in advance, and actually identifies the movement applied by the user by comparing the acceleration information measured when the user moves the portable terminal device with the reference data. Is that. The user can enter "3" into the portable terminal device by simply moving it, for example, as if writing "3" of the number on a plane perpendicular to the horizontal plane. Since the input to the portable terminal apparatus can be performed without using the keypad, the operability of the portable terminal apparatus can be improved and it can be used for various applications such as games.

In the case where the user inputs a character or the like using the above-described portable terminal device, it is preferable that the user grasps the portable terminal device in a free posture and moves it from the viewpoint of operability. In the above-described portable terminal apparatus which compares the actual movement of the portable terminal apparatus with reference data, the attitude at the time of moving the portable terminal apparatus is made to be the same as when the reference data is acquired, so as to be aware of the difference in acceleration components due to the attitude. You can specify the movements that the user made without. From this point of view, a method of acquiring reference data in all postures in advance may be conceived in order not to limit postures when operating the portable terminal apparatus, but this is not practical due to the limitation of memory capacity.

This invention is made | formed in view of such a situation, and the objective is to provide the portable terminal apparatus which improved the detection precision of a motion.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the portable terminal device of 1 aspect of this invention is a portable terminal device which has a function which detects the movement exerted by a user, The acceleration sensor which detects the acceleration component of a 3-axis direction, The inclination angle calculator calculates the inclination angle of the portable terminal device based on the detected three-axis acceleration component, the inclination angle storage unit that stores the inclination angle calculated by the inclination angle calculator, and the acceleration sensor detects the inclination angle after calculating the inclination angle. An acceleration data processor for generating processed data by correcting the acceleration data in at least two axis directions by the acceleration data in the posture that becomes the reference of the portable terminal device using the inclination angle stored in the inclination angle storage unit, and the reference posture Reference data for storing reference data according to a plurality of movements of the corresponding mobile terminal device And a detecting unit for detecting a movement corresponding to the processed data generated by the acceleration data processing with reference to the reference data stored in eokbu and a reference data storage section.

According to this aspect, even when a movement is made to a portable terminal apparatus in a posture different from the posture which becomes a reference | standard of a portable terminal device, it can correct with acceleration data in a reference posture. As a result, since the difference from the reference data can be reduced, the comparison with the reference data becomes easy and the motion detection accuracy can be improved.

The acceleration data processing unit may perform processing for calculating the amount of change in acceleration with respect to the acceleration data after correction using the inclination angle. The processing for calculating this change amount may take the difference of the processing data and may also perform time differential.

The acceleration data processing unit may perform amplitude normalization processing on the calculated variation amount data of acceleration. Depending on how the user's mobile terminal device is moved, the amplitude of the processed data may be smaller than the amplitude of the reference data, but by normalizing the amplitude, the comparison with the reference data becomes easier and the accuracy of motion detection can be improved. have.

The acceleration data processing unit may perform the normalization processing of the measurement time with respect to the amount of change of acceleration data which has been subjected to the normalization processing of the amplitude. Depending on how the user's portable terminal device is moved, the measurement time of the processing data may be shorter or longer than the measurement time of the reference data.However, by normalizing the measurement time, the comparison with the reference data becomes easier and the motion is detected. Accuracy can be improved.

Arbitrary combinations of the above components and conversion of the expression of the present invention between a method, a system, a recording medium, a computer program, and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a portable terminal device with improved motion detection accuracy.

1 is a diagram illustrating a configuration of a portable terminal device according to a first embodiment of the present invention.

2 is a diagram showing the positional relationship between the X-axis, the Y-axis, and the Z-axis of the portable terminal device and the acceleration sensor.

3A shows a state in which the portable terminal device is inclined at the roll angle θ _r , and FIG. 3B is a view illustrating a state in which the portable terminal device is inclined at the pitch angle θ _p .

4 is a diagram illustrating an example of a data structure of reference data.

FIG. 5A is a diagram illustrating a case where the portable terminal device is moved in the state of the reference posture, and FIG. 5B is a diagram illustrating a case where the portable terminal device is moved in a state where the roll angle θ _r is inclined from the reference pose.

6 is a flowchart of a motion detection process in the first embodiment.

7 is a diagram illustrating a configuration of a portable terminal device according to a second embodiment of the present invention.

8A shows the acceleration change amount data before normalizing the amplitude of the acceleration change amount data, and FIG. 8B shows the acceleration change amount data after normalizing the amplitude of the acceleration change amount data.

9 is a diagram illustrating a configuration of a portable terminal device according to a third embodiment of the present invention.

10A shows the acceleration change amount data before normalizing the measurement time, and FIG. 10B shows the acceleration change amount data after normalizing the measurement time.

<Description of the code>

10, 50, 70 mobile terminal devices

12 acceleration sensor

14 A / D Converter

16 tilt angle calculator

18 tilt angle memory

20 Enter button

22, 52, 62 acceleration data processor

24 acceleration data correction unit

26 acceleration variation calculation unit

28 Reference data storage

30 detector

32 control unit

34 Information presentation department

36 Communications

40 top

42 sides

54 Acceleration Variation Normalization Unit

56 measurement time normalization unit

60 horizontal planes

(First embodiment)

1 is a diagram illustrating a configuration of a portable terminal device 10 according to the first embodiment of the present invention. The portable terminal device 10 is a portable small electronic device such as a mobile phone or a personal data assistant (PDA). The user can input text into the portable terminal device 10 by moving the portable terminal device 10 as if the user grips the portable terminal device 10 and writes the text on a plane perpendicular to the horizontal plane.

As shown in FIG. 1, the portable terminal device 10 includes an acceleration sensor 12, an A / D converter 14, an inclination angle calculator 16, an inclination angle storage unit 18, an input button 20, and an acceleration. The data processing unit 22, the reference data storage unit 28, the detection unit 30, the control unit 32, the information presenting unit 34, and the communication unit 36 are provided. This configuration can be realized in hardware of any computer, CPU, memory, or other LSI, and can be realized in software by a program having an encoding function loaded in the memory. Is drawing. Therefore, it is understood by those skilled in the art that such functional blocks can be realized in various forms only by hardware, only by software, or by a combination thereof.

The acceleration sensor 12 has a function of detecting acceleration in three axes of the X, Y, and Z axes that are perpendicular to each other. 2 illustrates the positional relationship between the X-axis, the Y-axis, and the Z-axis of the portable terminal device 10 and the acceleration sensor 12. The casing of the portable terminal device 10 has a rectangular shape, and includes an acceleration sensor 12 therein. In addition, the upper surface 40 of the mobile terminal device 10 is provided with an information presenting unit 34 for displaying text, image information, and the like, and the side surface 42 of the mobile terminal device 10 for setting a timing for detecting movement. An input button 20 is provided. As shown in FIG. 2, the X axis of the acceleration sensor 12 extends in the direction parallel to the long side of the portable terminal device 10, and the Y axis extends in the direction parallel to the short side of the mobile terminal device 10. It is. The Z axis of the acceleration sensor 12 extends in the direction perpendicular to the upper surface 40 of the portable terminal device 10. The setting of the X axis, Y axis, and Z axis of the present embodiment is not particularly limited as an example. The method of the acceleration sensor 12 is not specifically limited, Any of a resistance value change method, a capacitance change method, a piezoelectric change method, etc. may be sufficient.

The A / D converter 14 shown in FIG. 1 samples the acceleration signal in the three-axis direction detected by the acceleration sensor 12 at predetermined time intervals, converts the digital signal into a digital value, and calculates the inclination angle calculator 16 and the acceleration data processor ( 22). The digital value of the acceleration signal obtained by one sampling is called the acceleration component and is expressed as (x _n , y _n , z _n ).

The inclination angle calculation unit 16 is the inclination angle (roll angle θ _r ) and the pitch angle of the mobile terminal device 10 based on the acceleration components (x _n , y _n , z _n ) input from the A / D converter 14. (θ _p )) is calculated. The roll angle θ _r is a rotation angle around the X axis, and the pitch angle θ _p is a rotation angle around the Y axis.

3A shows a state in which the portable terminal device 10 is tilted at the roll angle θ _r . 3B illustrates a state in which the portable terminal device 10 is inclined at the pitch angle θ _p . As shown to FIG. 3A and FIG. 3B, roll angle (theta) _r and pitch angle (theta) _p are angles with respect to the horizontal plane 60. As shown to FIG. The calculation formula of pitch angle (theta) _p and roll angle (theta) is shown by (1) and (2) formula.

θ _p = arcsin (x _n ). (One)

θ _r = arcsin (y _n / cosθ _p ). (2)

In the inclination angle calculator 16, the acceleration components sampled by the A / D converter 14 are sequentially sent to each other as time passes. In the present embodiment, the inclination angle calculator 16 is pressed by the input button 20. The angle of inclination is calculated when it loses. The acceleration component used for calculating the inclination angle may be an acceleration component obtained by one sampling obtained immediately after the input button 20 is pressed. Moreover, the inclination angle can also be calculated using the average value of several acceleration components acquired continuously after the input button 20 was pressed. In this case, the calculation accuracy of the inclination angle can be higher than in the case where the inclination angle is calculated using the acceleration component obtained by one sampling. The inclination angle storage unit 18 stores the roll angle θ _r and the pitch angle θ _p calculated by the inclination angle calculation unit 16.

The acceleration data processing unit 22 includes an acceleration data correction unit 24 and an acceleration change amount calculation unit 26. The acceleration data correction unit 24 includes a memory (not shown) and stores acceleration components sent from the A / D converter 14. Similar to the inclination angle calculator 16 described above, the acceleration data corrector 24 is sequentially sent an acceleration component sampled by the A / D converter 14 with the passage of time. ) Continues to store the acceleration component until the input button 20 is released after the tilt angle calculation unit 16 calculates the tilt angle. If the first stored acceleration component is (x ₀ y ₀ , z ₀ ) and the acceleration component acquired when the input button 20 is released is (x _n , y _n , z _n ), the memory has (x ₀ , y ₀ , z ₀ ) to store time series data of acceleration components from (x _n , y _n , z _n ). The time series data of this acceleration component is called acceleration data.

The acceleration data correction unit 24 uses the inclination angles (roll angles θ _r and pitch angles θ _p ) stored in the inclination angle calculator 16 to store the acceleration data stored in the memory. Correct it so that it becomes acceleration data in a reference posture. The posture which becomes the reference | standard of the portable terminal apparatus 10 is called "reference posture" below. The correction of the acceleration data in the reference posture of the portable terminal device 10 is that the acceleration data obtained when the mobile terminal device 10 is moved by holding the mobile terminal device 10 in a posture different from the reference posture is held in the reference posture to make the same movement. Means that the data is converted to acceleration data obtained when the mobile terminal device 10 is applied to the mobile terminal device 10. In the present embodiment, the XY plane of the acceleration sensor 12 is parallel to the horizontal plane, and the attitude of the portable terminal device 10 when the X axis is perpendicular to the moving plane as if the user writes letters is referred to. It is called posture. When the acceleration component of the acceleration data after the correction as the inclination angle _{(x 'n, y' n} , z 'n) of the inclination correction calculation is expressed as expression (3) to (5).

x '_n= x_n … (3)

y _'n = y _n -z _{n r} cosθ sinθ _r ... (4)

z '_n= -x_ncosθ_p― (Y_nsinθ_r+ z_ncosθ_rcosθ_p … (5)

Acceleration change amount is calculated section 26 calculates the acceleration change amount (△ x _n, y _n △, △ z _n) from the acceleration data from the acceleration correction data correction block 24. Acceleration change amount _{(△ x n, △ y n} , △ z n) is the acceleration component acceleration components _{(x n -1, y n -1} , z n-1) before one sampling from the _{(x n, y n, z} n) Calculate by subtracting A calculation equation of the acceleration variation _{(△ x n, △ y n} , △ z n) (6) ~ (8) represented by the formula:

Δx _n = x _n −x _{n −1} . (6)

Δy _n = y _n -y _{n -1} . (7)

Δz _n = z _n -z _{n -1} . (8)

The time series data of the acceleration change amount calculated by the acceleration change amount calculation unit 26 is called acceleration change amount data. The acceleration change amount data is output to the detector 30.

The reference data storage 28 stores acceleration change amount data corresponding to a plurality of movements of the portable terminal device 10 having a reference posture. Acceleration variation amount data stored in the reference data storage 28 is called reference data. This reference data is stored in correspondence with numbers and symbols. 4 is a diagram illustrating an example of a data structure of reference data. As shown in FIG. 4, the reference data storage unit 28 holds the portable terminal device 10 in the above-described reference attitude, and the Y-axis and Z-axis directions when the numbers "0" to "9" are written in the air. Acceleration variation amount of is stored corresponding to the number. In the present embodiment, the reference data in the X axis direction is not stored in the reference data storage 28. This is based on the premise of moving the mobile terminal device 10 as if writing a letter on a plane perpendicular to the horizontal plane, and holding the mobile terminal device 10 in the above-described reference position and writing on a plane perpendicular to the horizontal plane. This is because, when the mobile terminal apparatus 10 is moved as shown in Fig. 2, no significant acceleration occurs in the X-axis direction. For example, when the mobile terminal device 10 is moved as if writing a letter on a plane parallel to the horizontal plane, or when the mobile terminal device 10 is moved as if a letter is written at a plane having an inclination angle from the horizontal plane. The reference data may be constructed with respect to the required axis direction.

The reference data is configured to end the input of one digit during a predetermined measurement time. In this embodiment, as shown in FIG. 4, it is comprised so that input of one number may be completed during the measurement time of 2.5 second. The reference data may be stored in advance at the time of manufacture of the mobile terminal device 10, and the user may refer to the user by holding the mobile terminal device 10 in a reference posture and actually moving before the user uses the mobile terminal device 10. You can also register data. In this case, since the movement habit for each user can be registered, the accuracy of motion detection can be improved.

The detection unit 30 detects a motion according to the acceleration change amount data calculated by the acceleration change amount calculation unit 26 with reference to the reference data stored in the reference data storage unit 28. This motion is detected by comparing the acceleration change amount data input to the detection unit 30 with all the reference data stored in the reference data storage 28 and determining that the closest reference data is a motion applied by the user. The detection unit 30 then outputs, to the control unit 32, information of a number or symbol corresponding to the reference data determined to be closest to the acceleration change amount data.

The control unit 32 controls the portable terminal device 10 based on the information input from the detection unit 30. For example, in the mode of inputting a telephone number, when the number "3" is input from the detection unit 30, the control unit 32 instructs the communication unit 36 to dial "3". The communication unit 36 has a function of communicating with an external server by a wireless line. This communication may be done by wire. In addition, the controller 32 may instruct the information presenter 34 to display information such as a character input from the detector 30. The information presenter 34 has a speaker and can output various types of information to the user. The control unit 32 may display the recognized character on the information presenting unit 34 whenever the user inputs one character, and control the user to instruct the communication unit 36 after confirming.

5A and 5B are diagrams for explaining the inclination angle correction. 5A is a diagram illustrating a case where the portable terminal device 10 is moved in a state of a reference posture. As shown in FIG. 4A, when the portable terminal device 10 is moved at the acceleration a in the horizontal direction to the right in the state of the reference posture, the acceleration component output by the acceleration sensor 12 is (0, a, g). Becomes Where g is gravity acceleration.

FIG. 5B is a diagram illustrating a case where the portable terminal device 10 is moved in a state in which the roll angle θ _r is inclined from the reference posture. The direction in which the mobile terminal device 10 is moved is the horizontal direction on the right side as in the case of FIG. 5A and the magnitude of acceleration is also referred to as a. In this case, the acceleration components output by the acceleration sensor 12 are (O, acosθ _r -gsinθ _r , -asinθ _r -gcosθ _r ), and Y is different from the acceleration components (0, a, g) at the reference attitude. The acceleration components of the axis and the Z axis are different. As described above, when the portable terminal device 10 is tilted and moved, acceleration data in the Y-axis and Z-axis directions output by the acceleration sensor 12, even when moved with the same acceleration in the same direction, is the acceleration data when the reference posture is moved. With the difference from. The acceleration change amount data calculated from the acceleration data having such a difference also has a difference from the reference data stored in the reference data storage 28.

The portable terminal device 10 according to the first embodiment of the present invention performs the inclination angle correction of the acceleration data in the acceleration data correction unit 24 as described above. For example, in the case of the above-described example described with reference to FIG. 5B, the equations (3) to (5) are applied to the acceleration components (O, acosθ _r -gsinθ _r , -asinθ _r -gcosθ _r ), which are shown in FIG. 5A. The acceleration components O, a, and g in the case of the reference pose can be corrected. Thus, by correcting the inclination angle with respect to the acceleration data, the difference in the acceleration data generated when the portable terminal device 10 is moved in a posture different from the reference posture is absorbed, and the detection accuracy of the movement in the detector 30 can be improved. Can be.

6 is a flowchart of a motion detection process in the first embodiment. The user first grips the portable terminal device 10 and presses the input button 20 provided on the side surface 42 of the case. It is assumed here that the user grips the portable terminal device 10 in a state in which the roll angle θ _r and the pitch angle θ _p are inclined.

When the user presses the input button 20 (Y in S10), the inclination angle calculator 16 uses the equations (1) and (2) in the acceleration components obtained when the input button 20 is pressed. The inclination angle (roll angle θ _r , pitch angle θ _p ) of the device 10 is calculated (S12). Then, the inclination angle memory 18 stores the inclination angle calculated by the inclination angle calculator 16 (S14). When the input button 20 is not pressed (N in S10), the inclination angle calculator 16 waits for the input button 20 to be pressed without calculating the inclination angle.

Next, the user moves the portable terminal device 10 as if writing a character on a plane perpendicular to the horizontal plane while pressing the input button 20. The acceleration data correction unit 24 obtains the acceleration components x ₀ , y ₀ , z ₀ sent from the A / D converter 14 after calculating the inclination angle (S16). Acquisition of the acceleration component is continued until the input button is released (N in S18), and when the input button is released (Y in S18), the acquisition of the acceleration component is terminated (S20).

Next, the acceleration data correction unit 24 corrects the time series data of the acquired acceleration components, that is, the acceleration data using the inclination angle stored in the inclination angle storage unit 18 (S22). The acceleration angle corrected acceleration data is processed by the acceleration change amount calculation unit 26 to calculate the acceleration change amount (S24). The calculated acceleration change amount data is sent to the detection unit 30, and is compared with all the reference data stored in the reference data storage unit 28, and it is detected that the closest reference data is a movement applied by the user (S26).

When the inclination angle correction of the acceleration data is not performed, the acceleration data measured when gripped and moved in a posture different from the reference posture may have a difference from the reference data. According to the portable terminal device 10 according to the first embodiment, since the difference can be absorbed, it is possible to reduce the possibility of falsely detecting the motion and to improve the detection accuracy of the motion.

(2nd embodiment)

7 is a diagram illustrating a configuration of a portable terminal device 50 according to the second embodiment of the present invention. In the second embodiment, the acceleration data processing unit 52 further includes an acceleration change amount normalizing unit 54. The same code | symbol is used about the same component as 1st Embodiment, and description is abbreviate | omitted suitably.

The acceleration change amount normalizing unit 54 normalizes the amplitude with respect to the acceleration change amount data calculated by the acceleration change amount calculating unit 26 so as to match the amplitude of the reference data stored in the reference data storage unit 28. The amplitude of the acceleration change amount data output by the acceleration change amount calculation unit 26 changes as the user applies the movement to the portable terminal device 50. When the amplitude of the acceleration change amount data is small compared with the amplitude of the reference data, it may be difficult to compare with the reference data stored in the reference data storage 28. Even in such a case, the portable terminal device 50 according to the second embodiment normalizes the amplitude of the acceleration change amount data in order to increase the detection accuracy of the motion.

The normalization process of the amplitude of acceleration variation amount data is demonstrated using FIG. 8A and FIG. 8B. 8A shows acceleration change amount data before normalizing the amplitude of the acceleration change amount data. The acceleration change amount normalizing unit 54 first detects the maximum value of the absolute magnitude value from the acceleration change amount data on the Y and Z axes. In the example shown in FIG. 8A, the maximum value of the absolute amplitude value is 50. In FIG.

Next, the acceleration change amount normalizing unit 54 performs normalization so that the maximum value of the absolute value of the amplitude coincides with the maximum value of the absolute value of the amplitude in the reference data. For example, when the maximum value of the absolute value of the amplitude in the reference data is 100, the ratio with the maximum value 50 of the absolute value of the amplitude in the acceleration change data is 100/50 = 2, so 2 is set to the amplitude of the acceleration change data. Normalize by multiplying 8B shows the acceleration change amount data after normalizing the amplitude of the acceleration change amount data. The normalized acceleration change amount is output to the detector 30 and compared with the reference data as in the first embodiment.

As described above, in the mobile terminal device 50 according to the second embodiment, the acceleration change amount normalization unit 54 is provided so that the amplitude of the acceleration change amount data is larger than the amplitude of the reference data by the movement method of the user's portable terminal device 50. Even if it is small, the acceleration variation amount data can be normalized to match the amplitude of the reference data. By normalizing the amplitude, the comparison with reference data becomes easy and the motion detection accuracy can be improved.

(Third embodiment)

9 is a diagram illustrating a configuration of a portable terminal device 70 according to the third embodiment of the present invention. In the third embodiment, the acceleration data processing unit 62 includes a measurement time normalization unit 56. The same code | symbol is used about the same component as 1st and 2nd embodiment, and description is abbreviate | omitted suitably.

The measurement time normalization unit 56 normalizes the measurement time with respect to the acceleration change amount data output from the acceleration change amount normalization unit 54. The user inputs the acceleration data by moving the portable terminal device 70 while pressing the input button 20. Depending on the movement method of the portable terminal device 70 of the user, the measurement time of the acceleration data is greater than the measurement time of the reference data. It may be shorter or longer. In this case, there is a possibility that the comparison with the reference data becomes difficult and the detection accuracy of the movement is deteriorated. In such a case, the portable terminal device 70 according to the third embodiment also normalizes the measurement time in order to increase the detection accuracy of the motion.

The normalization of measurement time is demonstrated using FIG. 10A and FIG. 10B. 10A shows acceleration change amount data before normalizing the measurement time. As shown in FIG. 10A, the data of the acceleration variation amount data of the Y-axis and the Z-axis was completed in one second. In the present embodiment, as described above, since the measurement time of the reference data stored in the reference data storage 28 is 2.5 seconds, it is difficult to compare with the reference data according to the acceleration change amount data shown in FIG. The precision may deteriorate.

10B shows acceleration change amount data after normalizing the measurement time. As shown in Fig. 10B, the acceleration change amount data shown in Fig. 10A is delayed in the time axis direction and normalized so that the data ends in 2.5 seconds. By normalizing the measurement time in this way, the comparison with reference data becomes easy and the motion detection accuracy can be improved.

In the above, this invention was demonstrated based on embodiment. It is to be understood by those skilled in the art that the embodiments are exemplary and that various modifications may be made to their respective components or combinations of respective processing processes, and that such modifications are also within the scope of the present invention.

For example, in the above embodiment, the acceleration change amount data is calculated by calculating the difference between adjacent acceleration components, but the acceleration change amount data can also be calculated by time derivative of the acceleration data.

Further, in the above embodiment, the inclination angle calculation timing is set by providing an input button, but a stop time measuring unit for detecting that the movement of the mobile terminal stops for a predetermined time is provided to determine the inclination angle when the mobile terminal is stopped for a predetermined time. It can also be set to calculate. It is also possible to set the acquisition of the acceleration data to end by detecting the stop time measuring unit that the movement of the portable terminal for a predetermined time has stopped.

In addition, although the inclination angle was correct | amended with respect to the roll angle (theta) _r and pitch angle (theta) _{p in the} said embodiment, it can also carry out correction | amendment with respect to the yaw angle which is a rotation angle around the Z axis of an acceleration sensor further. In this case, even when the portable terminal device is moved at a yaw angle different from the reference posture, the movement detection accuracy can be improved.

In the above embodiment, since the mobile terminal device is assumed to move as if the user writes a letter on a plane perpendicular to the horizontal plane, the motion detection processing is performed using acceleration data in the Y-axis and Z-axis directions of the acceleration sensor. By using the acceleration data in the axial direction, it is also possible to configure such that free movement in the three-dimensional space can be detected.

In the above embodiment, the acceleration change amount is calculated after the inclination angle correction of the acceleration data, and then the acceleration change amount is normalized and the measurement time is normalized. However, the present invention is not limited to this order. For example, the acceleration change amount can be normalized or the measurement time is normalized after the inclination angle correction of the acceleration data, and the acceleration change amount can be calculated thereafter. In addition, it is also possible to normalize the acceleration change amount after normalizing the measurement time.

INDUSTRIAL APPLICABILITY The present invention can be applied to a field related to a portable terminal device having an acceleration sensor.

Claims (6)

A portable terminal device having a function of detecting a motion applied by a user, An acceleration sensor for detecting acceleration components in three axes; An inclination angle calculator configured to calculate an inclination angle of the portable terminal device based on the acceleration component in the three axis direction detected by the acceleration sensor; An inclination angle storage unit for storing the inclination angle calculated by the inclination angle calculation unit; After calculating the inclination angle, the acceleration data detected in the at least two axis directions by the acceleration sensor is corrected and processed to the acceleration data in the posture as a reference of the portable terminal device using the inclination angle stored in the inclination angle storage unit. An acceleration data processing unit for generating processing data, A reference data storage unit for storing reference data according to a plurality of movements of the portable terminal apparatus having a reference posture; And a detection unit for detecting a motion corresponding to the processed data generated by the acceleration data processing unit by referring to the reference data stored in the reference data storage unit. The method of claim 1, And the acceleration data processing unit calculates an amount of change in acceleration with respect to the acceleration data after correcting using the inclination angle. The method of claim 2, And the acceleration data processing unit performs amplitude normalization processing on the calculated variation amount data of acceleration. The method of claim 3, And the acceleration data processing unit performs normalization processing of measurement time on the amount of change of acceleration data subjected to normalization processing of amplitude. The method of claim 2, And the acceleration data processing unit performs normalization processing of the measurement time on the calculated amount of change of acceleration data. The method of claim 5, And the acceleration data processing unit performs amplitude normalization processing on the amount of change of acceleration data subjected to normalization processing of measurement time.

Images