JP4853950B2 - Game system, program, information storage medium - Google Patents

Description

  The present invention relates to a game system, a program, and an information storage medium.

2. Description of the Related Art Conventionally, there is an apparatus in which an acceleration sensor is provided in an operation unit to detect a vibration state of the operation unit and used as an operation signal during a game.
Japanese Patent No. 3119263

  However, since the threshold for detecting the operation event is a fixed value in the conventional game device that detects the operation event, the operation event cannot be detected even if the operation means is intended depending on the size of the threshold, On the contrary, there was a case where an operation event was erroneously detected even though it was not operated.

  The present invention has been made in view of the above problems, and its object is to eliminate erroneous detection of an operation event when detecting an operation event from an output value of an acceleration sensor provided in an operation means. It is to realize efficient operation event detection.

  (1) The present invention detects a pulse that satisfies an operation event generation condition based on a transition of an output value of an acceleration sensor provided in an operation means and a threshold value, and generates an operation event when the pulse is detected A computer that functions as a game processing unit that performs game processing based on an operation event generated by the operation event generation unit; and the operation event generation unit detects a threshold value at a given timing when the pulse is detected. And then a process of attenuating the threshold is performed.

  The present invention also relates to a computer-readable information storage medium that stores (records) a program that causes a computer to function as each unit. The present invention also relates to a game system including the above-described units.

  The acceleration sensor is a sensor that detects and outputs acceleration, and may be any method such as a piezoelectric type, an electrodynamic type, and a strain cage type. A sensor that can detect acceleration in the directions of the 1st to 3rd axes may also be used. Even when the output value is received from the triaxial acceleration sensor, only the output value in one axial direction among them may be received.

  When detecting a pulse that satisfies the operation event occurrence condition, first, the output value of the acceleration sensor may be received and detected based on the transition of the received output value and the threshold value.

  A pulse that satisfies the operation event occurrence condition may be detected when the current or previous output value of the acceleration sensor exceeds a threshold value.

  Raising the threshold value at a predetermined timing may be when the pulse that satisfies the operation event occurrence condition is detected, or may be immediately raised, or a value obtained by multiplying the current or immediately preceding output value by a predetermined ratio after the detection of the pulse. Alternatively, the value may be increased at a timing exceeding the threshold or when a value obtained by subtracting a predetermined value from the output value exceeds a threshold.

  The process of raising the threshold is a process of increasing the threshold continuously or stepwise, for example. The process for attenuating the threshold is a process for attenuating the threshold according to a given algorithm or a given function (exponential function, linear function).

  According to the present invention, when a pulse satisfying an operation event occurrence condition is detected, the threshold value is increased, and thereafter the threshold value is attenuated. By dynamically changing the threshold value, erroneous detection of an operation event is eliminated. An operation event can be detected efficiently.

  (2) The present invention is characterized in that the operation event generation unit performs a process of raising the threshold value when the output value of the acceleration sensor exceeds the threshold value.

  The case where the output value of the acceleration sensor exceeds the threshold value may be a case where the current or previous output value of the acceleration sensor exceeds a predetermined threshold value.

  According to the present invention, by performing the process of raising the threshold when the output value exceeds the threshold, it is possible to ignore the influence of the incidental pulse that occurs with the pulse that satisfies the operation event occurrence condition. It is possible to prevent erroneous detection of events.

  (3) The present invention is characterized in that the operation event generation unit performs a process of raising a threshold value so as not to exceed an output value of the acceleration sensor.

  Raising the threshold value so as not to exceed the output value of the acceleration sensor may be a case where the threshold value is raised so as not to exceed the current or previous output value of the acceleration sensor. Alternatively, the threshold value may be raised so as to maintain a value obtained by multiplying the current or previous output value by a predetermined ratio, or a value obtained by subtracting a predetermined value from the current or previous output value.

  According to the present invention, by performing the process of raising the threshold value so as not to exceed the output value, it is possible to reliably detect an operation event from each pulse even when non-accompanying pulses appear continuously. it can.

  (4) In the present invention, the operation event generating unit detects a peak of the pulse based on a transition of an output value of the acceleration sensor, and performs a process of attenuating a threshold when the peak of the pulse is detected. Features.

  The detection of the peak of the pulse that satisfies the operation event occurrence condition may be detected from the maximum value of the pulse that satisfies the operation event occurrence condition, or the current output value in the pulse satisfying the operation event occurrence condition tends to decrease from the increasing tendency. You may detect by turning. When the threshold value is raised so as not to exceed the output value, the peak of the pulse may be detected when the threshold value exceeds the current output value, or the threshold value may be detected from the current or previous output value. The peak of the pulse may be detected when a value obtained by subtracting the value or a value obtained by multiplying the current or previous output value by a predetermined ratio is exceeded.

  According to the present invention, when the peak of a pulse is detected, the threshold value is attenuated, so that the influence of the incidental pulse is ignored, and the operation event is reliably detected from the non- incidental pulse appearing thereafter. can do.

  (5) The present invention is characterized in that the operation event generating unit performs a process of holding a reference threshold and attenuating the threshold so as to converge to the reference threshold.

  The reference threshold is an initial value of the threshold and may be a minimum threshold.

  According to the present invention, by performing the process of attenuating the threshold so as to converge to the reference threshold, the raised threshold can be gradually returned to the reference threshold, and an operation event is reliably detected from the pulse that appears thereafter. Can do.

  (6) In the present invention, the operation event generation unit detects a pulse satisfying an operation event generation condition from the transition of the output value of each axis in the three-axis direction of the acceleration sensor. An operation event for each axis in the axial direction is generated, and the game processing unit processing unit performs a game process based on the operation event for each axis in the three-axis direction.

  According to the present invention, an operation event is generated for each axis in the three-axis directions, and a game process is performed based on the operation event, thereby changing the direction in which the operator operates the operation means, thereby allowing a plurality of different types. Operation commands can be entered.

  (7) In the present invention, the operation event generation unit determines a parameter necessary for attenuating the threshold based on the transition of the output value of the acceleration sensor, and performs a process of attenuating the threshold based on the determined parameter. It is characterized by performing.

  The parameter necessary for attenuating the threshold is a parameter for determining a trajectory pattern when the threshold is attenuated, and may be, for example, an attenuation coefficient, an attenuation rate, or an attenuation period used in the threshold attenuation algorithm. Further, it may be a reference threshold value that converges the threshold. Further, it may be a parameter necessary for selecting one of a plurality of attenuation algorithms.

  The parameter may be determined based on a transition of an output value output as a result of instructing and operating the operator to operate the operating means prior to the execution of the game, or an output output during the game The determination may be made in real time based on the history of values.

  According to the present invention, a parameter is determined based on the transition of the output value, and a process for attenuating the threshold based on the parameter is performed, so that an appropriate operation event can always be detected regardless of the operator's difference. be able to.

  (8) In the present invention, the operation event generation unit determines a parameter necessary for attenuating the threshold based on a given game parameter, and performs a process of attenuating the threshold based on the determined parameter. Features.

  The given game parameter is a parameter used in the game process, and may be, for example, a game difficulty level, a level, a character physical strength, a type, or the like.

  According to the present invention, an attenuation parameter is determined based on a given game parameter, and a process for attenuating a threshold value based on the determined attenuation parameter is performed, thereby realizing detection of an appropriate operation event according to the game situation. can do.

  Hereinafter, this embodiment will be described. In addition, this embodiment demonstrated below does not unduly limit the content of this invention described in the claim. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the present invention.

  FIG. 1 is a diagram illustrating an example of an operation unit according to the present embodiment.

  An acceleration sensor 3 is disposed inside the operation means 1, and when the operator shakes the operation means 1 with his hand, the acceleration sensor 3 detects and outputs an acceleration corresponding to the swing. The output signal of the acceleration sensor 3 is transmitted using the signal cable 5. A guide 7 is provided on the handle portion of the operation means 1, and the operator holds the operation means 1 in accordance with the guide 7. By doing so, the operating means 1 is always swung in a predetermined direction, so that the acceleration sensor 3 is installed with its orientation adjusted so that the acceleration in the swung direction can be detected.

  In addition, if the acceleration sensor 3 can detect acceleration in three axes, the operator can detect the acceleration in each axis by shaking the operation means 1 in the vertical direction, the horizontal direction, and the front-back direction.

  FIG. 2A is a diagram for explaining the transition of the output value of the acceleration sensor of the present embodiment.

  The horizontal axis of the graph represents time, and the vertical axis represents vertical (vertical) acceleration (excluding gravity components). The solid line waveform represents the transition of the output value of the acceleration sensor, and the broken line represents an example of a fixed threshold value. The left waveform w1 is a waveform when the operation means 1 is shaken strongly once in the vertical direction, the center waveform w2 is a waveform when weakly shaken once, and the right waveform w3 is continuous three times. This is a waveform when shaken. Here, it is assumed that an operation event is generated when a pulse satisfying the operation event generation condition is detected when the output value exceeds a threshold value.

  Looking at the waveform w1 in detail, the waveform w11 appears at the moment when the operation means is swung and stopped, and immediately after that, the operator's hand shakes due to the reaction stopped and the waveform w12 appears. In such a case, if an operation event is detected based on the fixed threshold value t1, the occurrence of an operation event twice is detected in the waveforms w11 and w12. That is, even if the operator intends to shake the operation means once, the game process is performed as if the operator was shaken twice. Similarly, the occurrence of an operation event four times is detected in the waveforms w31 to w34 even if the waveform w3 is shaken three times.

  Therefore, if an operation event is to be detected based on a larger fixed threshold t2, an operation event cannot be detected in the waveform w2 when the operation means 1 is shaken weakly. That is, the game process is performed on the assumption that the operator does not shake the operation means 1 although the operator intends to shake the operation means 1.

  FIG. 2B is a diagram for explaining the relationship between the transition of the output value of the acceleration sensor of the present embodiment and the threshold value.

  The broken line in the figure is the threshold value t3 of the present embodiment that dynamically changes. The threshold value t3 initially maintains the reference threshold value. When the output value of the waveform 11 exceeds the threshold value t3, the threshold value t3 is pulled up to the extent that the output value does not exceed the threshold value. Here, when the output value exceeds the threshold value t3 (point indicated by an arrow in the figure), an operation event is generated on the assumption that a pulse satisfying the operation event generation condition is detected.

  In this way, by dynamically changing the threshold value t3, it is possible to prevent the operation event from being detected in the incidental waveform generated by the reaction of stopping the operation means such as the waveform w12 and the waveform 34. Further, by attenuating the raised threshold value t3 so as to converge to the reference threshold value, an operation event can be reliably detected even in a waveform when the operation means 1 such as the waveform w2 is shaken weakly. Further, by raising the threshold value t3 so as not to exceed the output value, it is possible to reliably detect an operation event even in a waveform having a short interval from the immediately preceding waveform such as the waveform w32.

  FIG. 3 is an example of functional blocks of the game system of the present embodiment. The game system 10 of the present embodiment only needs to include at least the processing unit 100 and the operation unit 160, and the other blocks can be optional components.

  The operation unit 160 includes the acceleration sensor 3 and is used for inputting operation data when the operator performs an operation such as shaking or shaking, and the function is realized by hardware such as a controller with a built-in acceleration sensor. it can. The operation unit 160 may include other input means such as a lever, a direction instruction key, or a button in addition to the acceleration sensor 3.

  The acceleration sensor 3 detects acceleration according to an operation and outputs the detected acceleration information (output value), and can be realized by hardware such as an acceleration sensor of a piezoelectric type, an electrodynamic type, a strain cage type, or the like. . The acceleration sensor 3 may detect not only the uniaxial direction but also the acceleration of each axis in the triaxial direction and output the output value of each axis in the triaxial direction.

  The processing unit 100 performs various processing such as instruction instruction to each functional block, image processing, sound processing, and the like, and functions thereof are various processors (CPU, DSP, etc.), ASIC (gate array, etc.), etc. It can be realized by the hardware and given program. The processing unit 100 performs various processes using the storage unit 170 as a work area.

  The processing unit 100 includes an operation event generation unit 110, a game processing unit 120, an image generation unit 130, and a sound generation unit 150.

  The operation event generation unit 110 performs processing for detecting a pulse that satisfies the operation event generation condition based on the transition of the output value of the acceleration sensor 3 from the operation unit 160 and the threshold value, and generates an operation event when the pulse is detected. The processing to be performed is performed. When the pulse is detected, the threshold value is raised at a given timing, and thereafter the threshold value is attenuated.

  The operation event generating unit 110 may perform a process of raising the threshold when the output value of the acceleration sensor 3 exceeds the threshold.

  The operation event generating unit 110 may perform a process of raising the threshold value so as not to exceed the output value of the acceleration sensor 3.

  The operation event generation unit 110 may detect the peak of the pulse based on the transition of the output value of the acceleration sensor 3, and may perform a process of attenuating the threshold when the peak of the pulse is detected.

  The operation event generating unit 110 may hold the reference threshold and perform a process of attenuating the threshold so as to converge to the reference threshold.

  The operation event generation unit 110 detects a pulse that satisfies the operation event generation condition from the transition of the output value of each axis in the three axes of the acceleration sensor 3, and when the pulse is detected, the operation event generation unit 110 performs an operation on each axis in the three axes. You may perform the process which generate | occur | produces an event.

  The operation event generating unit 110 determines an algorithm for attenuating the threshold based on the transition of the output value of the acceleration sensor 3 or a given game parameter, and attenuates the threshold based on the determined parameter. You may perform the process to determine.

  The game processing unit 120 performs game calculation processing for generating game images and game sounds. Here, the game calculation process includes a process for determining the content and game mode of the game, a process for starting the game when the game start condition is satisfied, a process for advancing the game, and a game parameter that changes depending on the game play (game result) ) Or a process for ending the game when the game end condition is satisfied.

  Further, the game processing unit 120 performs a game calculation process based on the operation event generated by the operation event generating unit 110, and performs a process of generating an image and sound. Further, the game processing unit 120 may perform a game calculation process based on the operation event for each axis in the three-axis directions generated by the operation event generation unit 110.

  The image generation unit 130 performs drawing processing based on the results of various processing (game processing) performed by the processing unit 100, thereby generating an image and outputting the image to the display unit 190.

  The sound generation unit 150 performs sound processing based on the results of various processes performed by the processing unit 100, generates game sounds such as BGM, sound effects, or sounds, and outputs the game sounds to the sound output unit 192.

  The storage unit 170 is a work area such as the processing unit 100 and the communication unit 196, functions as a main memory and a frame buffer, and can be realized by hardware such as a RAM.

  An information storage medium 180 (a computer-readable medium) stores programs, data, and the like, and the function can be realized by an optical disk (CD, DVD), a memory card, a hard disk, a memory (ROM), or the like. . The processing unit 100 performs various processes of the present embodiment based on a program (data) stored in the information storage medium 180. That is, the information storage medium 180 stores a program for causing a computer to function as each unit of the present embodiment (a program for causing a computer to execute processing of each unit).

  The display unit 190 is for displaying and outputting an image generated according to the present embodiment, and its function can be realized by hardware such as a CRT or LCD.

  The sound output unit 192 outputs the sound generated by the present embodiment, and its function can be realized by a speaker, headphones, or the like.

  The save information storage device 194 stores player personal data, game save data, and the like, and examples of the save information storage device 194 include a memory card and a portable game system.

  The communication unit 196 performs various controls for communicating with the outside (for example, a host device or other game system), and functions thereof include hardware such as various processors or communication ASICs, programs, and the like. Can be realized.

  Note that a program (data) for causing a computer to function as each unit of this embodiment is distributed from the information storage medium of the host device (server) to the information storage medium 180 (storage unit 170) via the network and communication unit 196. May be. Use of the information storage medium of such a host device (server) can also be included in the scope of the present invention.

  FIG. 4 is a flowchart for explaining an example of processing for generating an operation event in the present embodiment. Here, the output value of the acceleration sensor is an output value in the vertical direction, the upward direction is a positive value (the gravity direction is a negative value), and the unit is gravitational acceleration = 1.0. In the present embodiment, the following processing is repeated every 1/60 seconds.

  First, a threshold value t, an acceleration sensor output value g, and a history flag f are initialized (step S1). At this time, the reference threshold T is set as the initial value for the threshold t. Next, the operation event sw is initialized (step S2), and the current output value of the acceleration sensor received by the output value receiving unit 19 is set as the output value g (step S3). Since the set output value includes a gravity component, it is removed (step S4). At this time, the acceleration fluctuation component may be extracted using a high-pass filter regardless of the equation in the figure.

  Next, the output value g and the threshold value t are compared (step S5). If the output value g is large, it is confirmed whether the history flag f is set (step S6). If detected, an operation event sw is generated (step S7), and a history flag f is set (step S8). If the history flag f is set, the operation event sw is not generated even if the pulse has already been detected. If the output value g is small as a result of comparing the output value g with the threshold value t, it is determined whether the output value g is 0 or less without generating the operation event sw (step S9), and the output value g is 0 or less. If so, the history flag f is initialized to detect the next pulse (step S10).

  Next, the threshold value t is compared with the value obtained by multiplying the output value g by the coefficient A (step S11). If the value obtained by multiplying the output value g by the coefficient A is large, the threshold value t is changed to this value to change the threshold value t. (Step S12), and if the threshold value t is large, the threshold value t is attenuated so as to converge to the reference threshold value T (step S13).

  Here, the coefficient A can be set in a range of 0.7 to 0.9, but the coefficient A is preferably set to 0.8. Taking the case where the coefficient A is 0.8 as an example, if the threshold value t is 80% or less of the output value g, it is determined that a pulse satisfying the operation event occurrence condition is detected, and the threshold value t is the output value. An operation event is generated when the threshold value t is increased so that the value of 80% of g is maintained (that is, the output value g is not exceeded), and conversely the threshold value t is 80% or more of the output value g. It is determined that a pulse peak satisfying the condition is detected, and the threshold t is attenuated so as to converge to the reference threshold T. Further, even when the threshold value t is equal to the reference threshold value T (t = T), the threshold value T is maintained without being further attenuated. Here, the attenuation coefficient S used for attenuation of the threshold value t can be set in a range of 0.05 to 0.15, but it is preferable to set the attenuation coefficient S to 0.07.

  Next, if an operation event sw is generated, a game process is performed based on the operation event sw (step S14). It is determined whether or not the detection of the operation event sw is continued (step S15). If the operation event sw is continued, the process returns to step S2, and the processes in step S2 and subsequent steps are repeated.

  FIG. 5 is a flowchart for explaining an example of processing for determining a parameter necessary for attenuating the threshold in the present embodiment.

  Here, the flow of processing for determining the above-described attenuation coefficient S based on the transition (sample data) of the output value at the time of operation by causing the operator to swing the operation means 1 a predetermined number of times prior to game execution will be described. .

  First, the maximum value is set as the attenuation coefficient S (step S21). Here, 0.20 is set as the maximum value. Next, the operator is instructed to shake the operation means 1 N times, and sample data of the acceleration sensor is acquired (step S22). Here, an instruction to the operator may be displayed on the display unit of the game apparatus, or may be instructed by voice. Next, by detecting a pulse that satisfies the operation event generation condition based on the acquired sample data and the threshold value, the operation event occurrence count n is acquired (step S23). The operation event occurrence number n can be obtained by executing the processing of step S2 to step S13 in FIG. 4 on the sample data and counting the occurrence number of the operation event sw.

  Next, the operation event occurrence count n is compared with the instruction count N (steps S24 and S25), and if the operation event occurrence count n is small, it is determined that the operator's swing is small (weak), and the shake is repeated N times. (Step S26). If the operation event occurrence number n is neither small nor large, that is, if the operation event occurrence number n is equal to the instruction number N, it is determined that the current attenuation coefficient S is appropriate, and the decrease coefficient S is slightly decreased (step S27). This is a process that is performed to provide a margin because an operation event may erroneously detect an operation event. If the operation event occurrence number n is large, it is determined that the operation event is generated from the incidental waveform generated by the reaction of stopping the swing such as the waveforms w12 and w34 in FIG. The operation coefficient S is decreased (step S28).

  Here, the relationship between the operation coefficient S and the threshold value will be described with reference to FIG. A waveform W4 in FIG. 6 is sample data when the operator shakes the operation means 1 once. The dotted line in the figure is a threshold value, and the threshold value t4 is a threshold value when the attenuation coefficient S is the largest. As the attenuation coefficient S is decreased, the threshold value changes to threshold values t5 and t6. When the threshold value t4 is used, an operation event is generated twice from the waveforms w41 and w42. However, when the threshold values t5 and 6 are used, an operation event is generated only from the waveform w41. In the process of determining the attenuation coefficient S in FIG. 5, the detection of the number of occurrences n of the operation event is started using a threshold value such as the threshold value t4 where the attenuation coefficient S is large, and the operation event is detected from an extra waveform such as the waveform w42. The appropriate attenuation coefficient S is determined by decreasing the attenuation coefficient S until it is not generated (until the instruction count N and the operation event occurrence count n match).

  Returning to the description of the flowchart of FIG. 5, after the attenuation coefficient S is decreased, it is determined whether or not the attenuation coefficient S is smaller than 0.03 (step S29). Returning, the occurrence number n of the operation event is detected again using the decreased attenuation coefficient S. If the attenuation coefficient S is smaller than 0.03, it is determined that the operator has swung more than the number of instructions N, and an instruction is given again to swing N times (step S30).

  Here, in step S22, an output value transition (sample data) is acquired by an operation instruction to the operator prior to the game, but the output value output by the operation of the operation means 1 performed during the game is acquired. The transition may be acquired as sample data, and the attenuation coefficient S may be determined based on this.

  The present invention is not limited to that described in the above embodiment, and various modifications can be made. For example, terms cited as broad or synonymous terms in the description in the specification or drawings can be replaced with broad or synonymous terms in other descriptions in the specification or drawings.

  In the above-described embodiment, the controller imitating maracas is described as an example of the operation means. However, the operation means may be a controller imitating one or more drum drums, swords, knives, and the like.

  In the above-described embodiment, the example of determining the parameter necessary for attenuating the threshold is described based on the transition of the output value of the acceleration sensor. However, the process is determined based on a given game parameter. Also good. For example, when the difficulty level of the game is parameterized, the damping coefficient S is increased as the difficulty level increases (the threshold value is set to a threshold value such as t4 in FIG. 6), and the operator shakes the operation means ( Appropriate operation events cannot be detected unless they are stopped accurately (so that no recoil occurs). Further, when the physical strength of the game character is parameterized, the reference threshold value can be increased as the physical strength decreases, and an operation event can be prevented from occurring unless the operating means is shaken more strongly than when there is physical strength.

It is a figure which shows an example of the operation means of this embodiment. It is a figure for demonstrating the relationship between the transition of the output value of the acceleration sensor of this embodiment, and a threshold value. It is an example of the functional block of the game system of this embodiment. It is a flowchart for demonstrating an example of the process which generate | occur | produces the operation event in this embodiment. It is a flowchart for demonstrating an example of the process which determines a parameter required in order to attenuate a threshold value in this embodiment. It is a figure for demonstrating the relationship between the operation coefficient of this embodiment, and a threshold value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation means 3 Acceleration sensor 5 Signal cable 7 Guide 10 Game system 100 Processing part 110 Operation event generation part 120 Game processing part 130 Image generation part 150 Sound generation part 160 Operation part 170 Storage part 180 Information storage medium 190 Display part 192 Sound output Unit 194 save information storage medium 196 communication unit

Claims (10)

An operation event generation unit that detects a pulse that satisfies an operation event generation condition based on a transition of an output value of an acceleration sensor provided in the operation means and a threshold value, and generates an operation event when the pulse is detected;
Causing the computer to function as a game processing unit that performs game processing based on the operation event generated by the operation event generation unit;
The operation event generation unit
A program characterized in that when the pulse is detected, the threshold value is raised at a given timing and then the threshold value is attenuated. In claim 1,
The operation event generation unit
A program for performing a process of raising a threshold value when an output value of the acceleration sensor exceeds a threshold value. In claim 1 or 2,
The operation event generation unit
A program for performing a process of raising a threshold value so as not to exceed an output value of the acceleration sensor. In any one of Claims 1 thru | or 3,
The operation event generation unit
A program for detecting a peak of the pulse based on a transition of an output value of the acceleration sensor, and performing a process of attenuating a threshold when the peak of the pulse is detected. In any one of Claims 1 thru | or 4,
The operation event generation unit
A program that retains a reference threshold and performs a process of attenuating the threshold so as to converge to the reference threshold. In any one of Claims 1 thru | or 5,
The operation event generation unit
Detecting a pulse satisfying an operation event generation condition from a transition of an output value of each axis in the three-axis direction of the acceleration sensor, and generating an operation event for each axis in the three-axis direction when the pulse is detected;
The game processing unit
A program for performing game processing based on an operation event for each of the three axes. In any one of Claims 1 thru | or 6.
The operation event generation unit
A program for determining a parameter necessary for attenuating a threshold based on a transition of an output value of the acceleration sensor, and performing a process for attenuating the threshold based on the determined parameter. In any one of Claims 1 thru | or 6.
The operation event generation unit
A program for determining a parameter necessary for attenuating a threshold based on a given game parameter and performing a process for attenuating the threshold based on the determined parameter.   A computer-readable information storage medium, wherein the program according to any one of claims 1 to 8 is stored. An operation event generation unit that detects a pulse that satisfies an operation event generation condition based on a transition of an output value of an acceleration sensor provided in the operation means and a threshold value, and generates an operation event when the pulse is detected;
A game processing unit that performs a game process based on the operation event generated by the operation event generation unit,
The operation event generation unit
A game system characterized in that when the pulse is detected, the threshold value is raised at a given timing, and thereafter the threshold value is attenuated.

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