JP6608106B2 - Semiconductor device, portable terminal device, and motion detection method - Google Patents

Description

  The present invention relates to a semiconductor device, a portable terminal device, and a motion detection method.

  There has been proposed a portable terminal device including a motion detection device that detects motion based on an acceleration signal output from an acceleration sensor (see, for example, Patent Document 1 and Patent Document 2).

  The motion detection apparatus described in Patent Document 2 excludes each of the stationary components obtained by low-pass filtering each of the acceleration component data output from the triaxial acceleration sensor, and each of the stationary components from each of the acceleration component data. To separate the motion components. This motion detection device determines that the axis having the maximum stationary component is the gravity axis, and when the axis corresponding to the motion component indicating the maximum value is an axis other than the gravity axis, the motion component indicating the maximum value Based on this, it is detected in which axial direction it has moved.

Special table 2012-529253 gazette JP 2012-98254 A

  A device that performs an input operation on a mobile terminal device by an operation (shaking) of shaking the mobile terminal device in a predetermined direction is known. This type of mobile terminal device is configured to perform a predetermined operation when a predetermined motion is detected. In such a portable terminal device, there is a problem that an exercise different from the exercise intentionally performed by the user is detected. For example, when a user applies vibration to the mobile terminal device in the positive direction of an arbitrary axis, the user normally holds the mobile terminal device in the positive direction of the axis while holding the mobile terminal device in his / her hand. Swing your arms. In many cases, the user performs a so-called swinging motion in which the user unconsciously swings the arm in the negative direction of the axis before swinging the arm in the positive direction. When a user's shaking motion is detected in the same way as regular shaking, an unintended exercise is input as an input operation to the mobile terminal device, and the mobile terminal device is operated as intended. It becomes difficult.

  The present invention has been made in view of the above-described points, and an object of the present invention is to prevent erroneous detection of an exercise that is not intended by the user.

The semiconductor device according to the present invention includes an input unit to which a plurality of acceleration signals indicating acceleration components along each of a plurality of different directions are input, and one direction selected from the plurality of directions. A setting unit that sets the axis along the specified axis in a predetermined order, a signal portion that exceeds an upper limit threshold of a predetermined range including acceleration zero from each of the time transitions of each of the acceleration signals within a predetermined time, and the predetermined An extraction unit that extracts a signal portion that is less than the lower limit threshold of the range, and the signal portion is selected based on a comparison result between the signal portions extracted by the extraction unit, and movement in a direction corresponding to the selected signal portion detecting a direction of the detected movement, when the direction of the specified axis set in the setting unit, and generates and stores the specified axis detection information about the specified axis, towards the detected motion If There is a direction different from the direction of the specified axis set in the setting unit, a detection unit that initially return the setting of the specified axis to erase all the specified axis detection information stored, is set in the setting unit An output unit that outputs a detection signal when the specified axis detection information is stored for all the specified axes .

A portable terminal device according to the present invention includes the semiconductor device described above, an acceleration sensor that outputs the acceleration signal, and a control unit that performs a predetermined operation in accordance with the detection signal.

The motion detection method according to the present invention sets an axis along one direction selected from a plurality of different directions as a designated axis in a predetermined order, and an acceleration component along each of the plurality of directions A signal portion exceeding the upper limit threshold of the predetermined range including zero acceleration and a signal portion less than the lower limit threshold of the predetermined range are extracted from each of the time transitions within the predetermined time of each of the plurality of acceleration signals indicating each of When the signal portion is selected based on the comparison result between the signal portions, the motion in the direction corresponding to the selected signal portion is detected, and the detected motion direction is the direction of the set designated axis, Generates and stores specified axis detection information for the specified axis, and if the detected motion direction is different from the specified axis direction set in the setting unit, all stored specified axis detections are performed. First return the settings of the specified axis to clear the broadcast, and outputting a detection signal when the specified axis detection information is stored for all the designated axis is set.

  According to the present invention, it is possible to prevent erroneous detection of exercise not intended by the user.

It is a block diagram which shows the structure of the semiconductor device which concerns on embodiment of this invention. It is a figure which shows an example of the acceleration signal for every axis | shaft. It is a figure which shows an example of the content of the order information which concerns on embodiment of this invention. (A) And (B) is a figure which shows an example of operation | movement of the motion detection apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the acceleration signal for every axis | shaft at the time of the shaking accompanying a swing-up operation | movement. It is a functional block diagram which shows the function structure of the semiconductor device which concerns on embodiment of this invention. It is a figure which shows the content of the process in the extraction part which concerns on embodiment of this invention. It is a figure which shows the content of the process in the detection part which concerns on embodiment of this invention. It is a flowchart which shows the flow of the motion detection process which concerns on embodiment of this invention. It is a figure which shows an example of the acceleration signal at the time of performing the shaking of a diagonal direction. It is a figure which shows the content of the process in the detection part which concerns on embodiment of this invention. It is a flowchart which shows the flow of the motion detection process which concerns on embodiment of this invention. It is a top view of the portable terminal device concerning the embodiment of the present invention. It is a block diagram which shows the structure of the portable terminal device which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding components are given the same reference numerals.

[First Embodiment]
FIG. 1 is a block diagram showing a hardware configuration of a semiconductor device 10 according to an embodiment of the present invention that functions as a motion detection device. FIG. 1 also shows an acceleration sensor 20 used with the semiconductor device 10.

The acceleration sensor 20 detects the acceleration generated in the directions of the X axis, the Y axis, and the Z axis in the three-dimensional orthogonal coordinate system, and outputs an acceleration signal corresponding to the detected magnitude of each axis. That is, the acceleration sensor 20 outputs an acceleration signal S _aX indicating the magnitude of the X-axis acceleration, an acceleration signal S _aY indicating the Y-axis acceleration, and an acceleration signal S _aZ indicating the Z-axis acceleration. The acceleration sensor 20 may be a three-axis acceleration sensor that detects acceleration in the X-axis, Y-axis, and Z-axis with a single device. Moreover, the acceleration sensor 20 may be comprised with a different device for every axis | shaft.

  The semiconductor device 10 includes a central processing unit (CPU) 11, a random access memory (RAM) 12, a read only memory (ROM) 13, an input / output port (I / O port) 14, and a bus 15 that interconnects them. It is a microcomputer.

The CPU 11 governs overall control of the semiconductor device 10. The ROM 13 is a storage medium that stores a later-described motion detection program 16 executed by the CPU 11 and order information 17 indicating the setting order of the designated axis. The RAM 12 is a storage medium that provides a work area for temporarily storing data, instructions, and the like used for arithmetic processing in the CPU 11. Acceleration signals S _aX , S _ay , and S _aZ output from the acceleration sensor 20 are supplied to the CPU 11 via the input / output port 14. The detection signal S _d which will be described later CPU11 is generated by performing the motion detection program 16 is output to the outside via the output port 14.

FIG. 2 is a diagram illustrating an example of X-axis, Y-axis, and Z-axis acceleration signals S _aX , S _aY, and S _aZ output from the acceleration sensor 20. In FIG. 2, the horizontal axis is time, and the vertical axis is acceleration. FIG. 2 shows an example in which the acceleration sensor 20 is caused to move in the positive direction along the Y-axis direction. In this manner, applying force from the outside to cause the acceleration sensor 20 to generate motion (acceleration) is hereinafter referred to as “shaking”. For example, when the acceleration sensor 20 is shaken in the positive direction along the Y axis, the acceleration sensor 20 outputs an acceleration signal _SaY having a peak on the positive side (upper side) as shown in FIG. In this case, the acceleration signals S _aX and S _{aZ on} the Z axis and the X axis are substantially at the zero level. The zero level of the acceleration signal indicates that no motion (acceleration) occurs in the acceleration sensor 20, and the positive or negative of the acceleration signal indicates the direction of acceleration along the axis.

In the semiconductor device 10, the acceleration signals S _aX , S _ay , and S _{aZ of} each axis exceed the upper limit threshold (positive side threshold) set for them or become less than the lower limit threshold (negative side threshold). If it is determined that the movement (shaking) along the direction of the axis has been performed. For example, in the example shown in FIG. 2, since the Y-axis acceleration signal _SaY exceeds the threshold value _TY1 set for the positive side, the semiconductor device 10 moves (shaking) along the Y-axis direction. Judge that it was broken. Note that the acceleration signal being less than the threshold value set for the negative side means that the absolute value of the acceleration in the negative direction is larger than the absolute value of the threshold value set for the negative side.

The semiconductor device 10 operates as follows by executing a motion detection program 16 described later. That is, the semiconductor device 10 sets each of a plurality of axes selected from the three axes based on the order information 17 stored in the ROM 13 as a designated axis in a predetermined order. In the semiconductor device 10, the direction of motion detected based on the acceleration signals S _aX , S _ay , and S _aZ of each axis supplied from the acceleration sensor 20 is a direction along each of the set designated axes. When the determination is made, the detection signal _Sd is output.

  Here, FIG. 3 is a diagram illustrating an example of the contents of the order information 17. In the example shown in FIG. 3, the X axis is designated as the designated axis first, the Y axis is designated as the designated axis, the Z axis is designated as the designated axis, the X axis is designated fourth. The case where it is set as an axis is shown.

  FIG. 4A is a diagram illustrating an example of the operation of the semiconductor device 10 that operates based on the motion detection program 16, and the setting order of the designated axes is as shown in FIG. It is an operation example in the case of the order of the axis and the X axis.

The semiconductor device 10 first sets the X axis as the designated axis based on the order information 17. When the X-axis is set as the designated axis and the movement (shaking) in the X-axis direction is detected, the semiconductor device 10 sets the Y-axis as the second designated axis based on the order information 17. When the semiconductor device 10 detects the movement (shaking) in the Y-axis direction when the Y-axis is set as the designated axis, the semiconductor device 10 sets the Z-axis as the third designated axis based on the order information 17. When the movement in the Z-axis direction (shaking) is detected when the Z-axis is set as the designated axis, the semiconductor device 10 sets the X-axis as the designated axis based on the order information 17. The semiconductor device 10 detects the movement of the X-axis direction (shaking) when X axis is set as the fourth specified axis, combined shaking outputs a detection signal S _d to determine what was established. That is, the detection signal _Sd is output when the shaking along the direction of the designated axis is performed for all the designated axes. In addition, the combination shaking refers to performing movement (shaking) in the specified axis direction for all the specified axes.

  FIG. 4B is a diagram illustrating another example of the operation of the semiconductor device 10 that operates based on the motion detection program 16, and the setting order of the designated axes is the X axis and the Y axis as shown in FIG. This is an example of operation when the order of the Z axis and the X axis is set.

  As shown in FIG. 4B, the semiconductor device 10 first sets the X axis as the designated axis. The semiconductor device 10 sets the Y axis as the second designated axis when detecting movement (shaking) in the X axis direction when the X axis is set as the designated axis. When the semiconductor device 10 detects a movement (shaking) in the direction of the Z axis different from the designated axis when the Y axis is set as the designated axis, the semiconductor device 10 determines that the combination shaking has failed, and is detected first. It is assumed that no motion in the designated axis (X-axis) direction has been detected, and the designated axis setting is returned to the first.

As described above, the semiconductor device 10 receives an input of an acceleration signal indicating the acceleration for each of the three axes of the three-dimensional orthogonal coordinate system, and selects a plurality of axes selected from the three axes in a predetermined order. Set as specified axis with. The semiconductor device 10, the direction of the detected based on the acceleration signal of each axis which is input motion, and outputs a detection signal S _d when it is determined that the direction along the respective selected axis that is set. According to such an aspect, since a plurality of different axes are set as the designated axes, it is possible to prevent the detection signal _{Sd from} being output due to a monotonous movement that occurs during walking or climbing up and down stairs. That is, it is possible to prevent the detection signal S _d by the exercises other than the intentional shaking by the user is output.

  By the way, when a user applies vibrations to an electronic device such as a mobile terminal device incorporating the acceleration sensor 20 in a positive direction of an arbitrary axis, for example, the user normally holds the electronic device in his / her hand. Then, the user swings his / her arm in the positive direction of the axis. At this time, the user often performs a so-called swinging motion in which the user unconsciously swings the arm in the negative direction of the axis before swinging the arm in the positive direction.

FIG. 5 is a diagram illustrating an example of acceleration signals S _aX , S _aY, and S _aZ when shaking is performed with a swing-up operation. For example, when shaking with a swinging motion is performed along the Y-axis direction, an acceleration signal _SaY having peaks on both the positive side and the negative side can be output from the acceleration sensor 20 as shown in FIG. . In the example shown in FIG. 5, the negative peak corresponds to the shaking motion, and the positive peak corresponds to regular shaking. As shown in FIG. 5, when the absolute value of each peak exceeds the absolute value of the threshold value, it is difficult to establish combination shaking when each peak is detected as a separate motion. The semiconductor device 10 according to the present embodiment is configured to exclude movements that are not intended by the user and that are associated with regular shaking, such as shaking motions, from detection targets.

  FIG. 6 is a functional block diagram showing a functional configuration of the semiconductor device 10. In the semiconductor device 10, the CUP 11 functions as an input unit 31, an extraction unit 32, a detection unit 33, a setting unit 34, and an output unit 35 by executing a later-described motion detection program 16 stored in the ROM 13.

The input unit 31 has a function of _receiving input of acceleration signals S _aX , S _aY and S _aZ of each axis output from the acceleration sensor 20.

The extraction unit 32 _detects the upper limit threshold value (positive side threshold value) of a predetermined range including zero acceleration from each of the time transitions within a predetermined period of the acceleration signals S _aX , S _aY and S _aZ of each axis input to the input unit 31. ) And a signal portion that is less than the lower limit threshold value (negative threshold value) of the predetermined range. That is, a signal portion whose acceleration value exceeds the absolute value of the upper limit threshold value (positive threshold value) and the absolute value of the lower limit threshold value (negative threshold value) is extracted from the acceleration signal.

FIG. 7 is a diagram illustrating an example of processing contents in the extraction unit 32. When the absolute value of the acceleration signal in any axis exceeds the absolute value of the threshold set for the positive side or the negative side, the extraction unit 32 determines the values of the acceleration signals S _aX , S _aY, and S _aZ for each axis. Are sampled over a predetermined period, and the sampling data is stored in the RAM 12. For example, in the case shown in FIG. 7, the extraction unit 32, from the time t ₁ when the absolute value of the acceleration signal S _aY exceeds the absolute value of the threshold T _Y2 that has been set for the negative side in the Y axis a predetermined time (e.g., 0. 5 seconds), the values of the acceleration signals S _aX , S _aY and S _aZ for each axis are sampled, and the sampling data is stored in the RAM 12.

The extraction unit 32 is configured by sampling data stored in the RAM 12, and from each of the acceleration signal waveforms indicating the time transition of the acceleration signal of each axis within a predetermined time, the waveform portion exceeding the positive threshold and the negative side The waveform portion that is less than the threshold is extracted. For example, in the case illustrated in FIG. 7, the extraction unit 32 determines the waveform portion P _Y1 from the time t ₁ to the time t ₂ and the time t ₃ to the time t ₄ from the acceleration signal waveform for the acceleration signal S _ay on the Y axis. Waveform portion _PY2 is extracted.

  The detection unit 33 selects a waveform part for each axis based on the result of comparing each waveform part extracted by the extraction unit 32 for each axis, and the direction of each axis based on the waveform part selected for each axis. To detect movement along. That is, among the waveform portions extracted by the extraction unit 32, waveform portions that are not selected are not considered in the motion detection.

FIG. 8 is a diagram illustrating an example of processing contents in the detection unit 33. The detection unit 33 compares the waveform portions P _Y1 and P _Y2 extracted by the extraction unit 32 as follows. That is, the detection unit 33 derives a numerical value regarding each of the waveform portions P _Y1 and P _Y2 and compares the derived numerical values. More specifically, the detector 33, as a number relating to the waveform portion P _Y1, corresponds to an approximate area of a waveform portion P _Y1, together to derive a numerical value Q _Y1 as indicated by the following equation (1), waveform portion as figures for P _Y2, corresponding to the approximate area of the waveform portion _{P Y2,} derives the numerical _{Q Y2} indicated by (2) below.

Q _Y1 = T1 × A1 / 2 (1)
Q _Y2 = T2 × A2 / 2 (2)

In (1), T1 is a period in which the acceleration signal waveform becomes the threshold _T less than _Y2 set for negative (the period from time _{t 1} to time _{t 2),} A1 is the time from the time _{t 1} t ₂ is the absolute value of the difference between the negative peak value B1 of the acceleration signal waveform and the negative threshold value _TY2 . That is, the numerical value _QY1 corresponds to the area of the lower triangle indicated by hatching in FIG. 8, and corresponds to the approximate area of the waveform portion _PY1 .

Likewise, in (2), T2 is a period in which the acceleration signal waveform exceeds the threshold value _{T Y1} set for positive (the period from time _{t 3} to time _{t 4),} A2 is the time _{t 3} exists between the time t ₄ from the peak value B2 of the side of the acceleration signal waveform, the absolute value of the difference between the positive side threshold value T _Y1. That is, the numerical value _QY2 corresponds to the area of the upper triangle indicated by hatching in FIG. 8, and corresponds to the approximate area of the waveform portion _PY2 .

The detection unit 33 compares the numerical values derived for each waveform portion for each axis, and selects the waveform portion for each axis based on the comparison result. That is, in the case shown in FIG. 8, the detection unit 33 selects the waveform portion P _Y2 having a larger numerical value Q _Y2 among the numerical values Q _Y1 and Q _Y2 regarding the waveform portions P _Y1 and P _Y2 extracted with respect to the Y axis. To do.

  It is assumed that the area of the waveform portion corresponding to the regular shaking by the user is larger than the area of the waveform portion corresponding to the shaking motion that the user does not intend. Therefore, by selecting an extracted waveform portion having a large area, it is highly possible to select a waveform portion corresponding to regular shaking. In other words, in the selection of the waveform portion, there is a high possibility that the waveform portion corresponding to the swinging motion can be excluded. In the example illustrated in FIG. 8, the case where the waveform portion is extracted only for the Y axis is illustrated, but when the waveform portion is also extracted for the X axis or the Z axis, the detection unit 33 performs these operations. Similarly, the waveform portion is selected for the other axis.

The detection unit 33 detects a movement along the direction of the axis based on the selected waveform portion. That is, in the case shown in FIG. 8, the detection unit 33 detects a positive motion on the Y axis based on the selected waveform portion _PY2 . In other words, the waveform portion _{PY1 that} is not selected is not taken into account when detecting the motion on the Y axis. As described above, according to the semiconductor device 10 according to the present embodiment, even when the absolute value of the acceleration signal in each axis exceeds the absolute value of the threshold value a plurality of times within a predetermined time, the movement within the predetermined period is performed. Is detected once for each axis.

  The setting unit 34 has a function of setting each of a plurality of axes selected from the X axis, the Y axis, and the Z axis as a designated axis in a predetermined order.

The output unit 35, when the direction of the detected by the detector 33 movement coincides with the direction of the specified axis set by the setting unit 34 has a function of outputting a detection signal S _d.

  FIG. 9 is a flowchart showing the flow of the motion detection process performed by the CPU 11 of the semiconductor device 10 executing the motion detection program 16 stored in the ROM 13.

  In step S <b> 1, the CPU 11 reads the order information 17 stored in the ROM 13. The order information 17 is information indicating a setting order of a plurality of designated axes selected from the three axes of the X axis, the Y axis, and the Z axis.

  In step S <b> 2, the CPU 11 functions as the setting unit 34 and sets the first designated axis among the X axis, the Y axis, and the Z axis based on the order information 17.

In step S _{<b> 3} , the CPU 11 functions as the input unit 31 and acquires the acceleration signals S _aX , S _ay , and S _aZ of the X axis, the Y axis, and the Z axis from the acceleration sensor 20.

  In step S4, the CPU 11 determines whether or not the time from the start of the process in step S3 has reached a predetermined timeout time. If the CPU 11 determines that the timeout period has not yet been reached, the process proceeds to step S5. If the CPU 11 determines that the timeout period has been exceeded, the process returns to step S2.

  In step S <b> 5, the CPU 11 determines whether or not the acceleration signal of any axis exceeds a threshold value set for the positive side and determines whether or not the acceleration signal of any axis is less than the threshold value set for the negative side. If the CPU 11 determines that the acceleration signal of any axis has exceeded the threshold set for the positive side, or has determined that the acceleration signal has fallen below the threshold set for the negative side, the process proceeds to step S6. In other cases, the process returns to step S3.

In step S _<b> 6, the CPU 11 functions as the extraction unit 32, samples the values of the acceleration signals S _aX , S _aY, and S _aZ of each axis over a predetermined time, and stores the sampling data in the RAM 12. Thereafter, the CPU 11 obtains an acceleration signal waveform indicating the time transition within a predetermined time of the acceleration signal of each axis, which is constituted by the sampling data stored in the RAM 12.

  In step S7, the CPU 11 functions as the extraction unit 32, and as illustrated in FIG. 7, from the acceleration signal waveform of each axis acquired in step S6, the waveform portion that exceeds the positive threshold value and less than the negative threshold value. The waveform portion that becomes is extracted.

  In step S8, the CPU 11 functions as the detection unit 33, compares the waveform portion extracted in step S7 for each axis, and selects the waveform portion for each axis based on the comparison result. Specifically, as illustrated in FIG. 8, the CPU 11 derives a numerical value Q corresponding to each area of the waveform portion extracted in step S <b> 7 according to the equation (1) or (2). CPU11 performs the process which selects the waveform part corresponding to a larger numerical value among the derived | led-out numerical values Q for every axis | shaft.

  In step S9, the CPU 11 functions as the detection unit 33, and detects movement for each axis based on the waveform portion selected in step S8. That is, the CPU 11 detects a movement along the direction of the axis corresponding to the waveform portion selected in step S8.

  According to the processing of steps S8 and S9, even if there is a waveform portion that exceeds the positive threshold and a waveform portion that is less than the negative threshold in the acceleration signal waveform within a predetermined time of any axis, In each axis, one waveform portion is selected, and motion is detected based on the selected waveform portion. That is, even when there are a plurality of extracted waveform portions, the motion is prevented from being detected a plurality of times based on each of the plurality of waveform portions.

  In step S10, the CPU 11 determines whether or not the direction of motion detected in step S9 matches the direction of the currently set designated axis. If the CPU 11 determines that the direction of motion detected in step S9 matches the currently set direction of the designated axis, the process proceeds to step S11. If the CPU 11 determines that the direction does not match, the CPU 11 performs the process. The process proceeds to step S12.

  In step S <b> 11, the CPU 11 stores designated axis detection information indicating that the movement in the direction of the designated axis currently set is detected in the RAM 12.

  In step S12, the CPU 11 deletes all the designated axis detection information stored in the RAM 12, and returns the process to step S2. That is, when a motion in a direction different from the currently set designated axis direction is detected, all the motions in the designated axis direction detected so far are not detected, and the initial state is restored. .

  In step S13, the CPU 11 determines whether or not movement in the designated axis direction has been detected for all the designated axes. If the CPU 11 determines that the movement in the designated axis direction has been detected for all the designated axes, the process proceeds to step S15. If the CPU 11 does not determine that the movement in the designated axis direction has been detected for all the designated axes, the process is performed. To step S14.

  In step S14, the CPU 11 sets the next designated axis and returns the process to step S3.

In step S15, CPU 11 include, but are combined shaking is satisfied, generates the detection signal S _d, it terminates the routine outputs it from the input-output port 14.

As described above, according to the semiconductor device 10 according to the present embodiment, since a plurality of different axes are set as the designated axes, the detection signal _Sd is output by a monotonous movement that occurs when walking or climbing stairs. Can be prevented. That is, it is possible to prevent the detection signal S _d by the exercises other than the intentional shaking by the user is output.

  In addition, according to the semiconductor device 10 according to the present embodiment, even when the absolute value of the acceleration signal in each axis exceeds the absolute value of the threshold value a plurality of times within a predetermined period, the motion is detected within the predetermined period. Is once per axis. Therefore, it is possible to exclude movements unintended by the user, such as swinging movements, that are not intended by the user from being detected, and it is possible to prevent the combination shaking from becoming difficult.

  In addition, according to the semiconductor device 10 according to the present embodiment, a numerical value corresponding to the area of each extracted waveform portion is derived, a waveform portion having a larger numerical value is selected, and movement based on the selected waveform portion is performed. Perform detection. According to this aspect, even when a swing motion is performed in association with regular shaking, it is possible to select a waveform portion corresponding to regular shaking and to detect motion based on regular shaking Is possible. In other words, it is possible to prevent the motion from being detected based on the waveform portion corresponding to the swinging motion.

  In addition, when comparing the numerical value derived | led-out about each of the extracted waveform part, you may exclude the numerical value which is not in a predetermined range from a comparison object. For example, it is assumed that vibrations having a relatively long cycle, such as walking motion, are significantly larger in value than normal shaking. On the other hand, vibrations with a relatively short period, such as vibrations when getting on a train, are assumed to be significantly smaller than normal shaking. Therefore, by limiting the range of the numerical values to be compared, it is possible to exclude the walking motion and the vibration during the train ride from the motion detection target.

  In the above-described embodiment, the numerical value corresponding to the area of each waveform portion is used as the numerical value for selecting the extracted waveform portion. However, the present invention is not limited to this. For example, a numerical value corresponding to the slope (angle) of the extracted waveform portion may be applied. The slope (angle) of the waveform portion may be, for example, the slope (angle) of a straight line connecting a point where the acceleration signal waveform exceeds the threshold (or a point where the acceleration signal waveform falls below the threshold) and the peak point of the acceleration signal waveform. . In this case, the ideal value of the slope (angle) of the waveform portion corresponding to regular shaking may be stored, and the extracted waveform portion having the value closest to the ideal value may be selected.

[Second Embodiment]
For example, even if the user intends to perform shaking along the Y-axis direction, in practice, oblique shaking including both the X-axis direction component and the Y-axis direction component may be performed. FIG. 10 is a diagram illustrating an example of the acceleration signal when the acceleration sensor 20 is shaken in an oblique direction including both the X-axis direction component and the Y-axis direction component. When shaking in an oblique direction is performed, peaks appear in the acceleration signals S _aX and S _aY of both the X axis and the Y axis, and the absolute value of each peak may exceed the absolute value of the threshold value. Further, the phase and amplitude of the acceleration signal S _{aX on} the X axis can be different from the phase and amplitude of the acceleration signal S _{aY on} the Y axis.

  According to the semiconductor device 10 according to the first embodiment described above, the waveform portion extracted for each axis is selected for each axis, and the motion of each axis is detected based on the waveform portion selected for each axis. When an acceleration signal as shown in FIG. 10 is input, there is a possibility that the motion in the Y-axis direction is first detected and then the motion in the X-axis direction is detected at a slightly delayed timing. That is, according to the semiconductor device 10 according to the first embodiment, when the shaking is performed in an oblique direction, there is a possibility that motion is detected on a plurality of axes, and it is difficult to establish the combination shaking. There is a risk of becoming. Therefore, according to the semiconductor device 10 according to the first embodiment, the user is required to perform shaking accurately along the direction of each designated axis so as not to deviate from the direction of the designated axis. The semiconductor device 10 according to the second embodiment can prevent the combination shaking from becoming difficult by detecting only the movement along one axis even when the shaking in the oblique direction is performed. Yes.

  The semiconductor device 10 according to the second embodiment is different from the first embodiment in the processing in the detection unit 33. That is, the detection unit 33 according to the first embodiment compares each waveform portion extracted for each axis by the extraction unit 32 for each axis, and performs processing for selecting the waveform portion based on the comparison result for each axis. The motion along the direction of each axis is detected based on the waveform portion selected one for each axis. On the other hand, the detection unit 33 according to the second embodiment compares all the waveform portions extracted for each axis by the extraction unit 32 as comparison targets, and all the extracted for each axis based on the comparison result. One of the waveform portions is selected, and movement along the direction of the axis corresponding to the selected waveform portion is detected. Of the waveform portions extracted for each axis by the extraction unit 32, the waveform portions that are not selected are not considered in the motion detection.

An example of the operation of the semiconductor device 10 according to the second embodiment will be described below with reference to FIG. As shown in FIG. 11, when peaks appear in both the X-axis and Y-axis acceleration signals S _aX and S _{aY and} the absolute value of each peak exceeds the absolute value of the threshold, the extraction unit 32 Waveform portions P _Y1 and P _Y2 are extracted from the acceleration signal waveform for the axis, and waveform portions P _X1 and P _X2 are extracted from the acceleration signal waveform for the X axis.

For each of the waveform portions P _Y1 , P _Y2 , P _X1, and P _X2 extracted by the extraction unit 32, the detection unit 33 approximates the area of these waveform portions according to the equation (1) or (2). Numerical values Q _Y1 , Q _Y2 , Q _X1 and Q _{X2 corresponding} to are derived. The detection unit 33 selects a waveform portion corresponding to a numerical value having the largest value from all the numerical values Q _Y1 , Q _Y2 , Q _X1, and Q _X2 derived for each of the waveform portions. In the example shown in FIG. 11, since the numerical _{Q Y2} derived for waveform portion _{P Y2} largest, the detection unit 33 selects the waveform portion _{P Y2.}

  When the shaking in the oblique direction is performed, the peak value of the acceleration signal in the direction intended by the user is considered to be larger than the peak value of the acceleration signal in the direction not intended by the user. That is, in the example shown in FIG. 11, it is considered that the user intends to perform shaking along the Y-axis direction. According to the semiconductor device 10 according to the present embodiment, since the waveform portion having the largest area is selected from the waveform portions extracted by the extraction unit 32, the waveform portion corresponding to the direction of shaking intended by the user is selected. The possibility of being able to be increased.

The detection unit 33 determines that the movement along the Y-axis direction has occurred based on the selected waveform portion _PY2 . That is, the waveform portions P _Y1 , P _X1, and P _{X2 that} are not selected are not taken into account when detecting the motion. As described above, according to the semiconductor device 10 according to the present embodiment, even when the absolute value of the acceleration signal exceeds the absolute value of the threshold value in a plurality of axes within a predetermined time due to the oblique shaking. Within the predetermined time, only movement along the direction of one axis corresponding to the selected waveform portion is detected. In addition, as in the semiconductor device according to the first embodiment, it is possible to exclude from the detection target movements that are not intended by the user and are associated with regular shaking, such as a swing-up operation.

  FIG. 12 is a flowchart showing the flow of the motion detection process performed by the CPU 11 of the semiconductor device 10 according to the second embodiment executing the motion detection program stored in the ROM 13.

  The motion detection program according to the second embodiment has steps S8A and S9A instead of the processing of steps S8 and S9 in the motion detection program (see FIG. 9) according to the first embodiment. Since the processing of other steps S1 to S7 and S10 to S15 is the same as that of the motion detection program according to the first embodiment, a duplicate description is omitted.

  In step S8A, the CPU 11 functions as the detection unit 33, and selects one waveform portion from among the waveform portions over all axes based on the comparison result of all the waveform portions extracted in step S7 as comparison targets. select. Specifically, the CPU 11 derives a numerical value Q corresponding to the area of each waveform portion extracted in step S7 according to the equation (1) or (2). The CPU 11 selects one waveform portion having the largest numerical value among the derived numerical values Q.

  In step S9A, the CPU 11 functions as the detection unit 33, and detects movement for each axis based on the waveform portion selected in step S8A. That is, the CPU 11 detects a movement along the direction of the axis corresponding to the waveform portion selected in step S8A.

  According to the processing in steps S8A and S9A, even when the absolute value of the acceleration signal exceeds the absolute value of the threshold value in a plurality of axes within a predetermined period due to the oblique shaking, the predetermined value within the predetermined period Only motion along the direction of one axis is detected.

  As described above, according to the semiconductor device 10 according to the second embodiment of the present invention, as a result of the oblique shaking, as shown in FIG. 10 and FIG. Even when the absolute value of the acceleration signal exceeds the absolute value of the threshold, it is possible to prevent motion from being detected for each of the plurality of axes. Therefore, it is possible to prevent the combination shaking from becoming difficult when the shaking in the oblique direction is performed. That is, according to the semiconductor device 10 according to the second embodiment, since it is not necessary to perform accurate shaking along the direction of the designated axis, operability can be improved as compared with the first embodiment. it can.

[Third Embodiment]
FIG. 13 is a plan view of a portable terminal device 50 according to the third embodiment of the present invention in which the semiconductor device 10 and the acceleration sensor 20 according to the first and second embodiments are incorporated. The mobile terminal device 50 may be a mobile communication terminal device such as a mobile phone or a smartphone.

  The mobile terminal device 50 is provided with a display screen 51 in the center of the upper surface. In the acceleration sensor 20 (not shown in FIG. 13), the X axis corresponds to the horizontal direction of the display screen 51, the Y axis corresponds to the vertical direction of the display screen 51, and the Z axis corresponds to the longitudinal direction of the display screen 51. As such, it is mounted inside the portable terminal device 50.

  FIG. 14 is a block diagram illustrating a configuration of the mobile terminal device 50. The mobile terminal device 50 includes an acceleration sensor 20, a semiconductor device 10, a main computer 60, and application software 70.

  The main computer 60 is a computer that controls the entire mobile terminal device 50 and includes a CPU, a RAM, and a ROM (not shown). The main computer 60 is configured by a semiconductor integrated circuit having a circuit scale larger than that of the semiconductor device 10 including a microcomputer. The main computer 60 corresponds to the control unit of the mobile terminal device according to the present invention.

The main computer 60 is connected to the input and output ports 14 of the semiconductor device 10, the detection signal S _d that is output from the output port 14 are supplied to the main computer 60. Application software 70 is installed in main computer 60. For example, the application software 70 may provide a function for sending / receiving and browsing an electronic mail, and may provide a function for reproducing audio data as another example.

The main computer 60, when receiving the detection signal S _d from the semiconductor device 10 performs a predetermined operation. As an example, the main computer 60 may activate the application software 70 when receiving the detection signal S _d from the semiconductor device 10. As another example, when receiving the detection signal S _d from the semiconductor device 10, the main computer 60 may cause the function provided by the application software 70 to be exhibited. For example, if the application software 70 is intended to provide a function for transmitting and receiving and browsing, etc. the e-mail, the main computer 60 may perform the transmission of e-mail in response to the detection signal S _d .

As described above, according to the mobile terminal device 50 according to the embodiment of the present invention in which the acceleration sensor 20 and the semiconductor device 10 are incorporated, the mobile terminal device 50 can be operated by shaking. Detection signal S _d is because combinations shaking is output when a condition is satisfied, it is possible to prevent the portable terminal device 50 from being operated by a monotonous motion that occurs during walking or climbing stairs.

  Here, if the main computer 60 performs the motion detection process performed by the semiconductor device 10, the main computer 60 constantly monitors the acceleration signal from the acceleration sensor 20. The main computer 60 is composed of a semiconductor integrated circuit having a relatively large circuit scale. When the main computer 60 is always operated, the power consumption increases and the battery consumption increases. According to the mobile terminal device 50 according to the present embodiment, since the semiconductor device 10 configured by a microcomputer having a circuit scale smaller than that of the main computer 60 performs the motion detection process, the main computer 60 performs the motion detection process. In comparison, power consumption can be reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the aspect of each said embodiment, A various change is possible. In each of the above-described embodiments, the case where the order information 17 indicating the setting order of the designated axis is stored in the ROM 13 is exemplified. However, the order information 17 may be appropriately rewritten.

In the semiconductor device 10, defines a plurality of combinations shaking may be configured to output a detection signal S _d corresponding to each combination shaking. For example, the semiconductor device 10 outputs the first detection signal S _d1 when the first combination shaking is established, and performs the second detection when the second combination shaking different from the first combination shaking is established. The signal S _d2 may be output. In this case, the portable terminal device 50 performs a first operation in response to the first detection signal S _d1, subjected to different second operation to the first operation in response to the second detection signal S _d2 May be.

Further, the semiconductor device 10, instead of the combination shaking outputs a detection signal S _d when a condition is satisfied, may output a command instructing the operation content to the portable terminal device 50. Further, the semiconductor device 10 may have a form of a module configured integrally with the acceleration sensor 20.

10 Semiconductor device 11 CPU
12 RAM
13 ROM
14 Input / output port 16 Motion detection program 17 Order information 20 Acceleration sensor 31 Input unit 32 Extraction unit 33 Determination unit 34 Setting unit 35 Output 50 Mobile terminal device 60 Main computer

Claims (8)

An input unit that receives a plurality of acceleration signals indicating acceleration components along each of a plurality of different directions;
A setting unit that sets an axis along one direction selected from the plurality of directions as a specified axis in a predetermined order;
An extraction unit that extracts a signal portion that exceeds an upper limit threshold of a predetermined range including zero acceleration and a signal portion that is less than the lower limit threshold of the predetermined range from each of the time transitions within each predetermined time of the acceleration signal;
The signal part is selected based on the comparison result between the signal parts extracted by the extraction unit, the motion in the direction corresponding to the selected signal part is detected, and the detected motion direction is determined in the setting unit. When the direction of the designated axis is set, the designated axis detection information is generated and stored for the designated axis, and the detected motion direction is different from the direction of the designated axis set in the setting unit. A detection unit that erases all stored specified axis detection information and returns the setting of the specified axis to the beginning ,
An output unit that outputs a detection signal when the specified axis detection information is stored for all the specified axes set in the setting unit ;
A semiconductor device including: The semiconductor device according to claim 1, wherein the detection unit selects the signal portion extracted by the extraction unit for each axis. The semiconductor device according to claim 1, wherein the detection unit selects one signal portion from all of the signal portions extracted by the extraction unit. The said detection part derives | leads-out the numerical value regarding each of the said signal part extracted by the said extraction part, and selects the said signal part based on the result of having compared the said numerical values. 2. A semiconductor device according to item 1. The detection unit derives a numerical value corresponding to the area of the waveform portion of the acceleration signal waveform indicated by each of the signal portions extracted by the extraction unit as the numerical value, and selects a signal portion having a larger numerical value. The semiconductor device according to claim 4.   The semiconductor device according to claim 4, wherein the detection unit excludes a numerical value that is not included in a predetermined range from the numerical values. A semiconductor device according to any one of claims 1 to 6 ,
An acceleration sensor that outputs the acceleration signal;
A control unit that performs a predetermined operation in response to the detection signal;
A mobile terminal device. An axis along one direction selected from a plurality of different directions is set as a designated axis in a predetermined order,
Threshold values on the positive side and the negative side from each of a plurality of acceleration signal waveforms indicating time transitions within a predetermined period of a plurality of acceleration signals each indicating acceleration along each of a plurality of axes having components in a plurality of directions. Extract the signal part that exceeds
Selecting the signal portion based on the comparison result of each of the extracted signal portions;
Detect movement along the direction of the axis corresponding to the selected signal part,
If the direction of the detected motion is the direction of the specified axis that has been set, the specified axis detection information is generated and stored for the specified axis, and the direction of the detected motion is different from the direction of the specified axis that has been set If this is the case, delete all stored specified axis detection information and return the specified axis settings to the beginning.
A motion detection method for outputting a detection signal when the specified axis detection information is stored for all set specified axes .