JP2005218706A - Game apparatus and game program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To express the sound of foot steps made when a character moves in a game space in real sound close to actual sound. <P>SOLUTION: The game apparatus is provided with a game image display means, a foot-step sound data storage means and a sound generation means. The game image display means displays a game image showing a moving state of the character on the ground surface in the game space on a display device. The foot-step sound data storage means stores a plurality of pieces of foot-step sound data expressing foot-step sounds different from each other. In this case, the foot-step sound data expresses the sound of one foot step. Further, the foot-step sound data storage means stores the plurality of pieces of foot-step sound data used when a condition about the state of the character is the same condition as one foot-step sound data group. The sound generation means carries out sound generation processing by using one piece of foot-step sound selected from in the foot-step sound data group every prescribed timing according to the movement of the character. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a game device and a game program, and more specifically to a game device and a game program that generate footsteps as a character appearing in a game space moves on the ground.

  2. Description of the Related Art Conventionally, there are game devices that generate footsteps when a character appearing in a game space walks. Although conventional game devices change the type of footsteps depending on the type of character and the type of ground on which the character walks (eg, floor, soil, gravel, etc.), when the character walks on a single type of ground, A single type of footstep was pronounced at a certain timing.

  In order to more realistically express footsteps, the following first and second prior arts are considered. In the first prior art, a plurality of speakers are arranged on a track of a horse racing game apparatus, channels corresponding to the number of running horses are assigned to each speaker, and each speaker is based on the current position of the horse. A footstep sound of a horse is generated by changing the volume and sound quality of the channel (see, for example, Patent Document 1). This technique expresses more realistic footsteps by controlling the footsteps for each running horse and producing only the footsteps of the horse located near the position of the speaker.

The second prior art changes the engine sound of a car or the footsteps of a person according to a change (viewpoint switching) between the viewpoint position and the positional relationship between the moving bodies (see, for example, Patent Document 2). .) For example, the engine sound is changed depending on whether the viewpoint is in the vehicle or the viewpoint outside the vehicle. As a result, the player can feel as if he is in the vehicle, and a more realistic sound can be provided to the player.
Japanese Patent Laid-Open No. 10-94675 JP 2002-346210 A

  Both the first prior art and the second prior art change the footsteps based on the positional relationship between the moving body and the player, but do not realistically represent the footsteps themselves of the moving body.

  Here, the footsteps of an actual person are often slightly different in sound quality between the footsteps of the right foot and the footsteps of the left foot. For example, sounds such as “cuts, tips, cuts, tips” are often heard alternately. In many cases, it is actually unnatural to hear only one type of sound, such as “cutlet, cutlet, cutlet, cutlet”. Also, considering the state of the scaffold, the same footsteps may not be heard every time even with the same footstep footsteps (or left footsteps). For example, when the character is walking on the floor, it is more realistic to hear the sound of “miss” (sounds of the floor) in addition to the sounds of “cut” and “knack”. Thus, in reality, there are various factors such as the position of the center of gravity of the walking person, the heel, and the surrounding environment, so footsteps cannot be heard constantly. The footsteps also change depending on the walking speed and the type of ground.

  Therefore, an object of the present invention is to provide a game device and a game program capable of expressing footsteps when a character moves in a game space with realistic sounds close to reality.

The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence with embodiments to be described later in order to help understanding of the present invention, and do not limit the present invention.
The present invention is a game device (3) that generates a footstep sound of a character as the character that appears in the game space displayed on the display device (TV 2) moves. The game apparatus includes game image display means (CPU 31 that executes steps S1, S10, S14, S16, S19, and S35; hereinafter, only the step S number is shown), and footstep data storage means (optical disc 4 or work memory). 32) and sounding means (steps S26, S27, S30, S31, S43, S44, S47, and S48). The game image display means causes the display device to display a game image indicating that the character moves on the ground in the game space. The footstep data storage means stores a plurality of footstep data (431a to 431d) representing different footsteps. Here, footstep data is data representing footsteps for one step. In addition, the footstep data storage means stores a plurality of footstep data used as a single footstep data group (431 to 433) when the conditions regarding the character state are the same. Here, the character state is a concept including the type of character, the type of ground under the character's feet, and the type of shoes worn by the character. The sound generation means performs sound generation processing using one footstep data selected from the footstep data group at every predetermined timing according to the movement of the character.

  The game device may further include group specifying means (step S3). The group designation means designates a footstep data group to be used for pronunciation based on the character state. At this time, the sound generation means selects one footstep data from the footstep data group designated by the group designation means.

  Further, the footstep data group may include first footstep data representing the footstep of the left foot of the character and second footstep data representing the footstep of the right foot of the character. At this time, the sound generation means performs sound generation processing using the first and second footstep data alternately.

  Further, the character may move on four legs. At this time, the footstep data group includes four footstep data representing different footsteps. The sound generation means performs sound generation processing using the four footstep data in a predetermined order.

  The footstep data group includes first footstep data representing the footstep of the left foot of the character, second footstep data representing the footstep of the right foot of the character, and a third footstep different from the first and second data. Data may be included. At this time, the game apparatus further includes random determination means (steps S21 and S38) for randomly determining whether or not to use the third footstep data at a predetermined timing according to the movement of the character. The sound generation means performs sound generation processing by alternately using the first and second footstep data, and when the random determination means determines to use the third footstep data, the sound generation means replaces the first or second footstep data. Then, sound generation processing is performed using the third footstep data.

  The footstep data group includes first footstep data representing the footstep of the left foot of the character, second footstep data representing the footstep of the right foot of the character, and a third footstep different from the first and second data. Data may be included. At this time, the game apparatus further includes random determination means (steps S21 and S38) for randomly determining whether or not to use the third footstep data at a predetermined timing according to the movement of the character. The sound generation means performs sound generation processing by alternately using the first and second footstep data, and the case where it is determined by the random determination means to use the third footstep data and the predetermined number of sound generations in the past When the third footstep data is not used in the process, the sound generation process is performed using the third footstep data instead of the first or second footstep data.

  Further, the footstep data changing means (steps S12, S13, S18) for changing at least one of the volume, pitch, tone length, and waveform amplitude of the footstep data used for the sound generation process based on a predetermined condition relating to the movement of the character. , And S37). At this time, the sound generation means performs sound generation processing using the footstep data changed by the footstep data change means.

  Further, the footstep data changing means may change the footstep data for the portion from the beginning of the waveform of the footstep data used in the sound generation process to a predetermined time by an integration process for adding a predetermined magnification to the amplitude of the waveform. . At this time, the predetermined magnification gradually increases in the range of 0 to less than 1 during the integration process.

  The game apparatus may further include sound generation timing calculation means (steps S11, S15, S17, and S36) for calculating the sound generation processing timing based on a predetermined condition relating to character movement. At this time, the game image display means changes the manner in which the character moves based on a predetermined condition, and displays the game image on the display device. The sound generation means executes the sound generation process at the timing calculated by the sound generation timing calculation unit.

  Further, the predetermined condition may be a condition relating to the moving speed of the character.

  Further, the footstep data group may include first footstep data representing the footstep of the left foot of the character and second footstep data representing the footstep of the right foot of the character. At this time, the predetermined condition is that the character is performing skip movement. When the character is skipping, the sound generation means alternately performs a process of performing the sound generation process twice using the first footstep data and a process of performing the sound generation process twice using the second footstep data. .

  The game apparatus further includes footstep data changing means (step S62) for changing at least one of the volume, pitch and pitch of the footstep data used for the sound generation process based on a predetermined condition relating to the movement of the character. May be. At this time, when the sound generation means performs the sound generation process twice using the first or second footstep data, the footstep data changed by the footstep data changing means in at least one of the first and second sound generation processes. By using, sound generation processing is performed so that the first footstep and the second footstep are different from each other.

  Further, the present invention may be provided as a game program for causing a game device to realize the above functions. Furthermore, by recording and transferring the game program on a recording medium, the present invention can be easily implemented on another independent computer system or game device.

  According to the present invention, even when the character is in the same condition, a plurality of different footsteps are generated. Here, as described above, the character state is a concept that includes the type of character, the type of ground under the character's feet, and the type of shoes worn by the character. Therefore, according to the present invention, for example, even when the character is moving on one type of ground, two or more types of footsteps are pronounced. Therefore, the footsteps are not monotonous, and realistic footsteps close to reality can be expressed.

  Further, when the game apparatus further includes group specifying means, the following effects can be obtained. That is, even when a plurality of footstep data groups are stored, appropriate footstep data can be easily specified.

  Further, when the footstep data group includes the first footstep data and the second footstep data, different footsteps can be generated between the right foot and the left foot. Therefore, it is possible to realistically represent the footsteps of a character that performs bipedal walking.

  Further, when the footstep data group includes four footstep data representing different footsteps, the footsteps of the four-legged character can be realistically expressed.

  In addition, when the footstep data group includes the first footstep data, the second footstep data, and the third footstep data, even the footstep of the same left foot (or right foot) generates a different sound at random. Therefore, realistic footsteps closer to reality can be expressed.

  Further, when the sound generation means performs sound generation processing using the third footstep data when the third footstep data has not been used in the sound generation processing of the predetermined number of times in the past, the following effects can be obtained. In other words, since the footsteps represented by the third footstep data are not pronounced at short intervals, it is possible to express footsteps that are natural and less uncomfortable.

  Further, when at least one of the volume, pitch, and length of the footstep data changes based on a predetermined condition regarding the movement of the character, the footstep changes according to the state of movement of the character. Can be expressed. The predetermined condition relating to the movement of the character is, for example, a condition relating to the moving speed of the character, and how to run or walk. Further, in this case, since the footstep data is changed and generated by the footstep data changing means, it is not necessary to prepare different footstep data for each character movement state, and the total amount of footstep data can be reduced. it can.

  Further, when the integration process is performed for the portion from the beginning of the waveform of the footstep data to a predetermined time, it is possible to generate a realistic footstep that gives the listener the impression of a soft footstep. This is particularly effective when the character moves on a soft ground.

  In addition, when the game device further includes a sound generation timing calculation means, since the sound generation timing of the footsteps changes according to the movement state of the character, the footsteps that match the animation of the game image can be expressed. Realistic footsteps can be expressed.

  In addition, when the predetermined condition is a condition relating to the moving speed of the character, the footstep sound or the sounding timing of the character can be changed according to the moving speed of the character, so that a more realistic footstep can be expressed.

  Further, when the process of performing the sound generation process twice using the first footstep data and the process of performing the sound generation process twice using the second footstep data are performed alternately, the following effects can be obtained. it can. That is, realistic skip footsteps close to reality can be expressed even when the character skips.

  Further, when the character performs skip movement and the sound generation process is performed so that the first footstep and the second footstep are different from each other, the skip footstep can be expressed more realistically.

  Hereinafter, a game apparatus and a game program according to an embodiment of the present invention, and a game system including the game apparatus will be described. FIG. 1 is an external view of the game system 1. Note that a stationary game device will be described as an example of the game device according to the present invention, but the game system is not limited to this. For example, a portable game device, an arcade game device, a mobile terminal, a mobile phone, The present invention can be applied to a device equipped with a computer that executes a game program, such as a personal computer.

  In FIG. 1, a game system 1 includes a stationary game device (hereinafter simply referred to as a game device) 3 and a television receiver (example of a display device connected to the game device 3 via a connection cord). 2) (hereinafter referred to as TV). A controller 6 having a plurality of operation switches that can be operated by a player is connected to the game apparatus 3. The game apparatus 3 is detachably mounted with an optical disk 4 as an example of an information storage medium storing the game program according to the present invention. Furthermore, a cartridge 5 equipped with a flash memory or the like for storing game save data or the like is detachably attached to the game apparatus 3 as necessary. The game apparatus 3 displays a game image obtained by executing a game program stored on the optical disc 4 on the television 2. Furthermore, the game apparatus 3 uses the save data stored in the cartridge 5 to execute a continuation of a game executed in the past or reproduce a game state executed in the past, and transfer a game image to the television 2. It can also be displayed. The player of the game apparatus 3 can enjoy the game by operating the controller 6 while viewing the game image displayed on the television 2.

  The controller 6 is detachably connected to the game apparatus 3 via the connection cord as described above. The controller 6 is an operation means for mainly operating a player character (character to be operated by the player) appearing in the game space displayed on the television 2, and includes operation buttons, keys, and a plurality of operation switches. An input unit such as a stick is provided. Specifically, the controller 6 is formed with a grip portion that is gripped by the player. The controller 6 includes a main stick 6a and a cross key 6b that can be operated with the thumb of the left hand of the player, a C stick 6c and an A button 6d that can be operated with the thumb of the right hand, and the like. In addition to the above buttons, the controller 6 can be operated with the B button, the X button, the Y button, the start-pause button, the R button operable with the index finger of the player's right hand, the index finger of the player's left hand, and the like. Includes L button. In addition, the game system 1 allows a plurality of players to play a game simultaneously by connecting a plurality of controllers 6 to the game apparatus 3.

  Next, the configuration of the game apparatus 3 according to the present invention will be described with reference to FIG. FIG. 2 is a functional block diagram of the game system 1. In FIG. 2, the game apparatus 3 includes a CPU (Central Processing Unit) 31 that executes various programs. The CPU 31 executes a startup program stored in a boot ROM (not shown), initializes a memory such as the work memory 32, and the like, and then once loads a game program stored in the optical disk 4 into the work memory 32. The game program is executed, and a game process corresponding to the game program is performed. The CPU 31 includes a work memory 32, a video RAM (VRAM) 33, an external memory interface (I / F) 34, a controller interface (I / F) 35, a GPU (Graphics Processing Unit) 36, and an audio interface (I / F) 37. , And an optical disk drive 38 are connected via a bus.

  The work memory 32 is a storage area used by the CPU 31 and appropriately stores a game program and the like necessary for the processing of the CPU 31. For example, the work memory 32 stores a game program read from the optical disc 4 by the CPU 31 and various data. The game program and various data stored in the work memory 32 are executed by the CPU 31. The VRAM 33 stores game image data for displaying a game image on the television 2. The external memory I / F 34 connects the game apparatus 3 and the cartridge 5 in a communicable manner by fitting the cartridge 5 into a connector (not shown). The CPU 31 accesses the backup memory provided in the cartridge 5 via the external memory I / F 34. The controller I / F 35 connects the external device and the game apparatus 3 so that they can communicate with each other by a connector (not shown). For example, the controller 6 is engaged with the connector via a connection cord and connected to the game apparatus 3 via the controller I / F 35. The GPU 36 is configured by a semiconductor chip that performs processing such as vector calculation and rendering processing necessary for displaying 3D graphics in response to an instruction from the CPU 31, and a game image rendered by the GPU 36 is displayed on the television 2. Is done. In addition, the game sound reproduced in the game process is output from the speaker 7 via the audio I / F 38. The speaker 7 is typically built in the television 2. The optical disk drive 37 reads various data such as a game program, image data, and sound data stored in the optical disk 4 in response to an instruction from the CPU 31.

  Hereinafter, game processing executed in the game apparatus 3 by the game program stored on the optical disc 4 will be described. First, the outline of the game processing according to the present invention will be described. The main object of the present invention is to express realistic footsteps. Here, in order to express realistic footsteps, a footstep data group including a plurality of footstep data is used in the present embodiment. A plurality of footstep data included in one footstep data group have the same conditions regarding the character state (for example, the type of the character, the type of the ground under the character's feet, and the type of shoes the character is wearing). Used in cases. That is, in the game device according to the present embodiment, even if the character type and the ground type are the same, the footsteps are expressed using a plurality of footstep data. Thus, even when walking on one type of ground, for example, the footsteps of the right foot and the left foot are expressed by different footsteps, or the normal footsteps and the different footsteps are randomly pronounced. Is possible. Therefore, in this embodiment, a more realistic footstep can be expressed. Hereinafter, the game processing in this embodiment will be described in detail.

  FIG. 3 is a diagram showing data stored in the work memory 32 of the game apparatus 3 during the game process. In the game process, the work memory 32 stores a game program 41, image data 42, sound data 43, a group specification table 44, a footstep data change table 45, and random value data 46.

  The game program 41 includes an image display program 41a, a group designation program 41b, a movement state detection program 41c, a sound generation timing calculation program 41d, a footstep data change program 41e, a sound generation processing program 41f, and a random value setting program 41g. Is included. The image display program 41a is a program for causing the television 2 to display a game image showing how the character moves on the ground in the game space. The group designation program 41b is a program for designating one footstep data group from the footstep data groups based on the character state (for example, the type of ground below the character's feet). The footstep data group is a set of a plurality of footstep data used when the conditions relating to the character state (the ground type condition and the character type condition) are the same conditions. The footstep data is data representing footsteps for one step of the character. Details of the footstep data and the footstep data group will be described later. The movement state detection program 41c is a program for detecting the movement state of the character (the type of movement of the character) such as whether the character is walking or running. The pronunciation timing calculation program 41d is a program for calculating the timing for reproducing the footsteps of the character. The footstep data changing program 41e is a program for changing the volume, pitch, and length of footstep data. The sound generation processing program 41 f is a program for outputting footsteps represented by footstep data from the speaker 7. The random value setting program 41g is a program for setting a random value used in a game process to be described later.

  The image data 42 includes character image data 42a and ground image data 42b. The image data 42 is used when the game apparatus 3 displays a game screen on the television 2. The character image data 42a is data indicating an image of a character appearing in the game space. Here, the character may be any character such as a human being, an animal, or a robot as long as a footstep is pronounced as a sound effect when the character moves in the game space. The ground image data 42b is data indicating an image of the ground in the game space. In addition to these data, the image data 42 may include background image data, or may include character image data 42a for a plurality of characters (for example, player characters and enemy characters). .

  The audio data 43 includes a plurality of footstep data representing different footsteps. The audio data 43 stores a plurality of footstep data as one footstep data group. In FIG. 3, the footstep data included in the audio data 43 is divided into first to sixteenth footstep data groups. The first to sixteenth footstep data groups are selectively used according to the type of ground below the character's feet. The first footstep data group 431 includes first to fourth footstep data 431a to 431d. Although not shown in FIG. 3, the first to fourth footstep data are similarly included in the other footstep data groups. Note that the footstep data included in each footstep data group may be different data. For example, the first footstep data included in a certain footstep data group and the first footstep data included in another footstep data group need not be the same data. In addition, the first to fourth footstep data included in one footstep data group are selectively used when the character is moving on one kind of ground. That is, the four footstep data included in one footstep data group are used when the conditions regarding the type of the ground under the feet of the character are the same. Details of the first to fourth footstep data will be described later in the description of FIG.

  The group designation table 44 is a table used to determine a footstep data group to be used in accordance with the type of ground below the character's feet. Details of the group designation table 44 will be described in the description of FIG. The footstep data change table 45 is a table used for changing footstep data. In the present embodiment, the footstep data change table 45 includes a table for changing the volume (FIG. 11 to be described later), a table for changing the pitch and the sound length (FIG. 12 to be described later), and the character skip-moving. It consists of three tables called a table (FIG. 13 to be described later) used when performing the above. Details of the footstep data change table 45 will be described in the description of FIGS. The random value data 46 is data indicating a random value used in a game process to be described later. In addition, the work memory 32 stores various data used for game processing.

  FIG. 4 is a diagram for explaining the first to fourth footstep data. As shown in FIG. 4, in the present embodiment, the first footstep data is used to represent a representative footstep of the left foot. Note that “representative” as used herein means “used relatively frequently compared to individual footsteps described later”. In the following, for the sake of convenience, the pronunciation of the first footstep data is described as “cut”. On the other hand, the second footstep data is used to represent a representative footstep of the right foot. Similar to the first footstep data, the work memory 32 stores data indicating the sound shown in the waveform example of FIG. 4 as second footstep data. Note that the pronunciation of the second footstep data is described as “knack”.

  The third footstep data is used to express a unique footstep of the left foot. Note that “individual” here means “used at a relatively low frequency compared to the above-mentioned typical footsteps”. The pronunciation of the third footstep data is described as “Kutsu”. The fourth footstep data is used to express a unique footstep of the right foot. The pronunciation of the fourth footstep data is described as “Mishi”. The work memory 32 stores data indicating the sound shown in the waveform example of FIG. 4 as first to fourth footstep data.

  Next, game processing executed by the game apparatus 3 will be described with reference to FIGS. When the power of the game apparatus 3 is turned on, the CPU 31 of the game apparatus 3 executes a start program stored in a boot ROM (not shown), and each unit such as the work memory 32 is initialized. Then, the game program stored in the optical disc 4 is read into the work memory 32 via the optical disc drive 37, and the execution of the game program 41 read into the work memory 32 is started. The flowcharts shown in FIGS. 5 to 9 show the processing after the above processing operation. Note that the processing shown in this flowchart is performed as a cooperative operation of the CPU 31 and the GPU 36, but it is possible to cause almost all of the processing to be performed only by the CPU 31, for example.

  5 to 9 are flowcharts showing a flow of game processing executed in the game apparatus 3 according to the present embodiment. In this flowchart, description of game processing that is not directly related to the present invention is omitted, and description will be mainly given of character footstep sound generation processing.

  First, in step S1, a game image is displayed. The process of step S1 is performed by executing the image display program 41a. In this game image, a state in which the character moves on the ground in the game space is shown. In the subsequent step S2, the type of ground below the character's feet is detected. In step S3, a footstep data group corresponding to the type of ground detected in step S2 is designated. Steps S2 and S3 are performed by executing the group designation program 41b. In the process of step S3, the group designation table 44 is used. Hereinafter, the details of the process of step S3 will be described with reference to FIG.

  FIG. 10 is a diagram illustrating an example of the group designation table. As shown in FIG. 10, the group designation table is a table in which the type of the ground is associated with the footstep data group used when the character moves on the ground. In the present embodiment, there are 16 types of ground, and footstep data groups are prepared according to the types of ground. For example, when the type of ground detected in step S2 is soil, the footstep data group to be used is determined as the first footstep data group.

  Returning to the description of FIG. 5, it is determined in step S4 whether or not the character is moving on the ground. This determination can be made by, for example, detecting whether or not an operation for moving the character is performed by the player, or detecting whether or not the position of the character in the current frame has changed from the position of the character in the previous frame. It is done by doing. If it is determined that the character is not moving on the ground, it is determined in step S5 whether or not the game is over. When it is determined that the game is over, the CPU 31 ends the game process. On the other hand, if the game is not finished, the process returns to step S4. As shown in steps S4 and S5, the process of generating footsteps is not performed when the character is not moving.

  On the other hand, if it is determined in step S4 that the character is moving on the ground, the type of character movement is specified in steps S6 to S9. Steps S6 to S9 are performed by executing the movement state detection program 41c. In the present embodiment, it is assumed that there are five types of character movements: running, normal walking, low-speed walking, slow speed advance, and skip. The type of character movement is typically determined by a game operation by the player. In addition, a flag indicating the type of character movement is set in the work memory 32, and the type of movement at the present time can be specified by the flag. Hereinafter, the process (steps S6 to S9) for specifying the type of character movement will be described in detail.

  First, in step S6, it is determined whether or not the character is skipping. If it is determined that the character is skipping, skip sound generation processing (steps S35 to S48) described later is performed. On the other hand, if it is determined that the character is not skipping, it is determined in step S7 whether or not the character is running. If it is determined that the character is running, the process (steps S10 to S13) for generating the running footstep sound is performed. The process for generating the running footsteps is a process for displaying the running footage animation or correcting the footstep volume represented by the footstep data so as to be a sound suitable for the running footsteps. On the other hand, if it is determined in step S7 that the character is not running, the process of step S8 is performed.

  In step S8, it is determined whether or not the character is normally walking. When it is determined that the character is normally walking, a process (steps S14 and S15) for generating a normal footstep sound is performed. On the other hand, if it is determined that the character is not normally walking, the process of step S9 is performed. That is, in step S9, it is determined whether or not the character is walking at a low speed. When it is determined that the character is walking at a low speed, processing for generating footsteps of low-speed walking (steps S16 to S18) is performed. On the other hand, if it is determined that the character is not walking at a low speed, a process (steps S19 and S20) for generating a low-speed forward footstep is performed.

  Next, the process (steps S10 to S13) for generating a running footstep sound will be described. First, in step S10, an animated game image in which the character is running is displayed. In this embodiment, it is assumed that the running animation repeatedly displays 10 image data in order. That is, it is assumed that the running animation is image data for 10 frames. Further, when displaying the running animation, it is assumed that the second and seventh frame images are images immediately after the character puts his feet on the ground. Specifically, the second frame image is an image immediately after the character puts his left foot on the ground, and the seventh frame image is an image immediately after the character puts his right foot on the ground. The process of displaying this animation is continued until the character performs another motion.

  Subsequently, in step S11, the sounding timing of the rush is calculated. The process of step S11 is performed by executing the sound generation timing calculation program 41d. Here, the sound generation timing is the time when the footsteps are generated. As described above, in the running animation, the images of the second frame and the seventh frame are images immediately after the character puts his feet on the ground. Therefore, in the case of running, the timing at which the second and seventh frame images are displayed is the sound generation timing. In the present embodiment, a table in which the type of movement is associated with the sound generation processing timing is prepared in advance. In step S11, the sound generation timing is calculated by referring to this table. In another embodiment, it may be detected frame by frame whether or not the character's feet have touched the ground, and a frame in which it is detected that the character's feet have touched the ground may be used as the sounding timing.

  Subsequently, in steps S12 and S13, the CPU 31 changes the footstep data so that the sound is suitable for running. Steps S12 and S13 are performed by executing the footstep data changing program 41e. Specifically, in step S12, the volume of the footstep data is changed. The process of step S12 is performed using the footstep data change table 45. Details of the footstep data change table 45 will be described below.

  FIG. 11 is a diagram illustrating an example of a footstep data change table. The footstep data change table shown in FIG. 11 is a table for changing the volume of footstep data. As shown in FIG. 11, this table is a table in which the type of movement other than skip and the volume multiplication rate are associated with each other. Since this table is used regardless of the type of ground, it is used for all footstep data. In FIG. 11, since the volume multiplication rate for the case of running is 1.25, the volume of the footstep data is multiplied by 1.25 in step S12.

  Returning to FIG. 5, in step S <b> 13, the CPU 31 changes the pitch and pitch of the footstep data. The process of step S13 is performed using the footstep data change table 45. FIG. 12 is a diagram showing an example of a footstep data change table for changing the pitch and pitch of footstep data. This table is a table in which the type of movement other than skip, the pitch and the rate of sound length are associated with each type of ground. In step S13, the ground type is determined according to the ground type detected in the immediately preceding step S2. For example, when the type of the ground detected in the immediately preceding step S2 is lawn, the multiplication factor of the pitch for the case of running is 1.16, and the reduction rate of the sound length is 0.55. Therefore, in step S13, footstep data changes according to these values.

  In steps S12 and S13, all footstep data belonging to the used footstep data group are changed. Specifically, all footstep data belonging to the footstep data group corresponding to the type of ground detected in the immediately preceding step S2 changes. Here, the CPU 31 stores the changed footstep data in the work memory 32 separately from the original (pre-change) footstep data. After the processes in steps S12 and S13, the process in step S21 shown in FIG. 6 is performed.

  Next, processing for generating normal walking footsteps (steps S14 and S15) will be described. First, in step S14, an animated game image in which the character is normally walking is displayed. The specific process of step S14 is in accordance with the process of step S10 described in the case of rushing. In the following step S15, the sounding timing of normal walking is calculated. In this embodiment, the normal walking animation is composed of image data for 20 frames. The image in the fourth frame is an image immediately after the character puts his left foot on the ground, and the image in the 14th frame is an image immediately after the character puts his right foot on the ground. Therefore, in the case of normal walking, the timing at which the fourth and fourteenth frame images are displayed is the sound generation timing.

  In the present embodiment, in the case of normal walking, the CPU 31 does not perform processing for changing footstep data. Therefore, after the processes in steps S14 and S15, the process in step S21 shown in FIG. 6 is performed.

  Next, the process (steps S16 to S18) for generating a low-speed walking footstep will be described. First, in step S16, an animated game image in which the character is walking at low speed is displayed. The specific process of step S16 is in accordance with the process of step S10 described in the case of rushing. In the subsequent step S17, the sounding timing of low-speed walking is calculated. In the present embodiment, the low-speed walking animation is composed of image data for 40 frames. The image in the eighth frame is an image immediately after the character puts his left foot on the ground, and the image in the 28th frame is an image immediately after the character puts his right foot on the ground. Therefore, in the case of normal walking, the timing at which the 8th and 28th frame images are displayed is the sound generation timing.

  In subsequent step S18, CPU 31 changes the volume of the footstep data. Similar to step S12, the process of step S18 is performed using the footstep data change table 45 shown in FIG. In the present embodiment, in the case of low-speed walking, the CPU 31 does not perform a process of changing the pitch and pitch of footstep data. Therefore, after the processes in steps S16 to S18, the process in step S21 shown in FIG. 6 is performed.

  Next, the process (steps S19 and S20) for generating a low-speed forward footstep will be described. Here, in this embodiment, it is assumed that footsteps are not generated in the case of a slow speed advance. That is, in step S19, an animation game image in which the character is moving forward at a slow speed is displayed. Then, in the subsequent step S20, as shown in FIG. 11, the process of not generating the footsteps is performed by changing the footstep data by setting the volume multiplication rate to zero. After the processes in steps S19 and S20, the process in step S21 shown in FIG. 6 is performed.

  In step S21 shown in FIG. 6, one value is randomly selected from the values 0 to 3. The process of step S21 is performed by executing the random value setting program 41g. The process of step S21 is a process for determining whether the footstep data used in the sound generation process is the representative sound or the individual sound. Data indicating the selected value is stored in the work memory 32 as random value data 46. Here, it is assumed that the sound generation process is performed using a unique sound only when “3” is selected in step S21.

  Next, in step S22, it is determined whether the left foot sounding timing has come. Specifically, the process of step S22 is performed for each frame, and is performed depending on whether or not the sound generation timing calculated in step S11 or the like has arrived. For example, in the case of a running foot, the left foot sounding timing is the timing for displaying the second frame image of the running foot animation, so the determination in step S22 is affirmative when the frame for displaying the image is reached.

  If it is determined in step S22 that the left foot sounding timing has arrived, the process of step S24 described later is performed. On the other hand, if it is determined in step S22 that the left foot sounding timing has not arrived, the process of step S23 is performed. That is, in step S23, it is determined whether the right foot sound generation timing has arrived. The process in step S23 is similar to the process in step S22. If it is determined in step S23 that the right foot sound generation timing has arrived, the processing in step S28 described later is performed. On the other hand, if it is determined in step S23 that the right foot sounding timing has not arrived, the process of step S22 is performed in the next frame.

  In step S24, it is determined whether or not the value selected in the immediately preceding step S21 is “3”. Specifically, this determination is made based on whether or not the value indicated by the random value data 46 in the work memory 32 is “3”. If the value selected in the immediately preceding step S21 is not “3”, the process of step S27 is performed. That is, in step S27, sound generation processing is performed using the first footstep data representing a representative footstep of the left foot. For example, in the case of running foot, the first footstep data of the footstep data changed in step S13 is used. In the case of low-speed walking, the first footstep data of the footstep data changed in step S18 is used. Used. In the case of normal walking, the first footstep data out of the footstep data specified in step S3 is used as it is. The process of step S27 is performed by executing the sound generation process program 41f. In step S27, the footstep sound of the character is output from the speaker 7.

  On the other hand, when the value selected in the immediately preceding step S21 is “3”, the process of step S25 is performed. That is, in step S25, it is determined whether or not the footstep data used in the last two sound generation processes is footstep data representing a representative footstep (that is, the first or second footstep data). If it is determined that the footstep data is not representative, processing in step S27 is performed. When individual footsteps are used continuously, the footsteps may be felt unnatural. However, it is possible to prevent the footsteps from becoming unnatural by preventing the unique footsteps from being continuously generated by the process of step S25.

  On the other hand, if it is determined in step S25 that the footstep data used in the last two sound generation processes is representative footstep data, the process of step S26 is performed. That is, in step S26, sound generation processing is performed using the third footstep data representing the individual footsteps of the left foot.

  Steps S24 to S27 described above are processes for performing the left foot sound generation process. Therefore, when the ground type is the floor, the sound of “katsu” in the first footstep data is usually pronounced and the sound of “kut” in the third footstep data is occasionally pronounced at the sounding timing of the left foot. It becomes. That is, even when moving on the same floor, realistic footsteps can be expressed by generating multiple types of footsteps. In addition, since the timing at which the sound of the third footstep data is pronounced is determined randomly rather than regularly, a realistic footstep can be expressed more naturally.

  Note that the processing of steps S28 to S31, which is processing for performing the right foot sound generation processing, is the same processing as steps S24 to S27. In steps S28 to S31, the second footstep data is used as a representative footstep of the right foot, and the fourth footstep data is used as a unique footstep of the right foot. As a result, by the processing in steps S22 to S31, as a normal footstep when the ground type is, for example, a floor, a sound of “katsu” in the first footstep data and a footstep of “knack” in the second footstep data are included. It will be pronounced alternately. Thereby, realistic footsteps with different footsteps between the right foot and the left foot can be expressed. In the present embodiment, in addition to these footsteps, a sound “ku” in the third footstep data and a sound “miss” in the fourth footstep data are occasionally generated. Therefore, a more realistic footstep can be expressed. In the present embodiment, two footstep data called third and fourth footstep data are used as individual footsteps. However, in other embodiments, one type of unique footstep data may be used. .

  After step S26, 27, 30 or 31, the process of step S32 shown in FIG. 7 is performed. That is, in step S32, it is determined whether or not the character movement is stopped. This determination can be performed by the same method as in step S4 shown in FIG. When it is determined that the movement of the character is stopped, the process returns to the process of step S5 shown in FIG. On the other hand, if it is determined that the movement of the character has not been stopped, the process of step S33 is performed. That is, in step S33, it is determined whether or not the ground type has changed. This determination can be made by comparing the ground type detected in the immediately preceding step S2 with the current ground type. That is, when the ground type detected in the immediately preceding step S2 is different from the current ground type, it is determined that the ground type has changed, and the process returns to step S2 shown in FIG. On the other hand, if the ground type detected in the immediately preceding step S2 is the same as the current ground type, it is determined that the ground type has not changed, and the process of step S34 is performed. In step S34, it is determined whether or not the character movement type has changed. If the character movement type has changed, the process returns to step S6 shown in FIG. 5. If the character movement type has not changed, the process returns to step S21 shown in FIG.

  Next, the sound generation process (steps S35 to S48 shown in FIG. 8) when the character skips will be described. First, in step S35, a skip animation is displayed. Here, it is assumed that the skip animation is composed of image data for 20 frames. The fourth and tenth frame images are images immediately after the character puts his left foot on the ground, and the 14th and 20th frame images are images immediately after the character puts his right foot on the ground. Suppose there is.

  In step S36, the skip sounding timing is calculated. Specifically, the timing at which the fourth, tenth, fourteenth and twentieth frame images are displayed is determined as the sound generation timing. In subsequent step S37, the CPU 31 changes the volume, pitch, and length of the footstep data. The process of step S37 is performed using the footstep data change table 45. FIG. 13 is a diagram illustrating an example of a footstep data change table for changing footstep data in the case of skipping. As shown in FIG. 13, this table shows the volume multiplication rate, pitch multiplication rate, and sound length reduction rate in the case of skipping. Since this table is used regardless of the type of ground, it is used for all footstep data. In step S37, the footstep data changes according to these values.

  Following step S37, the process of step S38 is performed. The process of step S38 is the same as that of step S21 shown in FIG. The processes in steps S39 to S48 after step S38 are the same as the processes in steps S22 to S31 shown in FIG. 6 except that the last four sound generation processes are determined in steps S42 and S46. It should be noted that the reason for determining the sound generation process of the past four times in step S42 and step S46 is that, in the case of skipping, four legs are added in one cycle of animation. By performing the above steps S39 to S48, footsteps are generated in the fourth frame (left foot), the tenth frame (left foot), the 14th frame (right foot) and the 20th frame (right foot).

  After step S43, 44, 47 or 48, the process of step S49 shown in FIG. 9 is performed. The process of step S49 is the same as step S32 shown in FIG. 7, the process of step S50 is the same as step S33 shown in FIG. 7, and the process of step S51 is the same as step S34 shown in FIG. If the character movement type has not changed in step S51, the process returns to step S38 shown in FIG. Above, description of the game process in this embodiment is complete | finished.

  As described above, according to the present embodiment, by using a plurality of types of footstep data, a plurality of types of footsteps can be expressed even when walking on the same ground. Therefore, a more realistic footstep can be expressed than before. In the above embodiment, the sound generation processing is performed so that the footsteps of the right foot and the left foot are different from each other, and the sound generation processing is performed so that individual footsteps are occasionally sounded, but in other embodiments, Only one of the sound generation processes may be performed. That is, the footsteps of the right foot and left foot may be made different from each other without producing unique footsteps, and the representative footsteps and individual footsteps are distinguished without distinguishing the footsteps of the right foot and the left foot. May be pronounced.

  In the above embodiment, when the type of character movement is skip, the footsteps of the same foot are pronounced twice in succession. That is, after the footstep sound of the left foot is pronounced twice in succession, the process in which the footstep sound of the right foot is pronounced twice in succession is repeated. Here, in another embodiment, the first footstep and the second footstep may be changed. Hereinafter, as a modification of the present embodiment, a process in the case where the first footstep and the second footstep are generated differently will be described with reference to FIG.

  FIG. 14 is a flowchart showing a part of the game processing of the modification of the present embodiment. The process shown in FIG. 14 is a process obtained by modifying a part of the process shown in FIG. In FIG. 14, the same processing as the processing shown in FIG. In FIG. 14, when the determination result of step S41 is negative and when the determination result of step S42 is negative, the process of step S61 is performed. That is, in step S61, it is determined whether or not the sound generated in the previous sound generation process is the footstep of the left foot. This determination is a process for determining whether the current sound generation process is the first left foot sound generation process or the second left foot sound generation process. That is, the sound produced in the previous sound generation process is the left foot footstep means that the current sound generation process is the second left foot sound generation process. Also, the fact that the sound generated in the previous sound generation process is not the left foot footstep means that the current sound generation process is the first left foot sound generation process.

  In step S61, if the sound sounded in the previous sound generation process is not the left footstep sound, the process of step S44 is performed. On the other hand, when the sound sounded in the previous sound generation process is the footstep sound of the left foot, the process of step S44 is performed after the process of step S62 is performed. In step S62, the first footstep data is changed. That is, in the second left foot sound generation process, different footstep data from the first left foot sound generation process is used. As a result, the first footstep and the second footstep can be changed and sounded.

  14 shows only the left foot sound generation process (steps S39 to S44), the right foot sound generation process (steps S40 to S48) is also performed in the same manner as in FIG. In FIG. 14, the footstep data is changed only for representative footsteps (first footstep data and second footstep data). However, individual footsteps (third footstep data and fourth footstep data) are changed. As with typical footsteps, footstep data may be changed.

  Further, in the above-described embodiment, the case where a character imitating a person is assumed and the case where the character performs bipedal walking has been described as an example. However, the present invention is also applied to the footsteps of a character imitating an animal that performs quadrupedal walking. Is possible. At this time, for example, footstep data shown in FIG. 15 is prepared. In FIG. 15, the first to eighth footstep data belong to one footstep data group. Each footstep data is used as representative footsteps of the left forefoot, right forefoot, left hind foot, and right hind foot and individual footsteps of the left forefoot, right forefoot, left hind foot, and right hind foot. In this case, according to the movement of the character, the first to fourth footstep data are used in a predetermined order at a predetermined timing (for example, every time the character's foot touches the ground), and sound generation processing is performed. Furthermore, corresponding footstep data of the fifth to eighth footstep data is used instead of any one of the first to fourth footstep data based on a randomly set value. For example, in a game in which a bipedal character imitating a person and a quadruped character imitating an animal appear, one footstep data may be shared between two characters.

  In the above embodiment, the volume, pitch, and length of the footstep data are changed according to the moving speed and the type of the ground. Here, in another embodiment, the amplitude of the waveform indicated by the footstep data may be changed according to the moving speed and the type of the ground. A specific example of changing the amplitude of the waveform is shown below.

  Here, an example is shown in which the amplitude of the footstep data waveform is changed in accordance with the type of the ground. Specifically, the footstep data is changed so that the amplitude gradually increases at the beginning portion (rising portion) of the waveform of the footstep data. FIG. 16 is a diagram for explaining this process. That is, FIG. 16A is a diagram illustrating an example of footstep data before the processing is performed, and FIG. 16B is a diagram illustrating an example of footstep data after the processing is performed. As shown in FIG. 16, the footstep data changes so that the amplitude gradually increases from 0 in the portion of the footstep data waveform from the beginning to the predetermined time T (that is, the beginning portion). Specifically, the game device performs an integration process of integrating a predetermined magnification to the amplitude for a portion from the beginning of the footnote data waveform to a predetermined time T. In this integration process, the predetermined magnification A is a value of 0 or more and less than 1. Further, the predetermined magnification A changes so as to gradually increase as time elapses. That is, the magnification that is integrated with the amplitude of a predetermined portion of the waveform (the predetermined portion is an arbitrary portion of the beginning of the waveform) is greater than the magnification that is integrated with the amplitude of the portion closer to the head than the predetermined portion. growing. By performing the process of accumulating the predetermined magnification A that changes in this way, the waveform shown in FIG. 16A can be changed to the waveform shown in FIG. As described above, by using footstep data having a waveform in which the amplitude gradually increases at the beginning, an impression of a softer footstep can be given to a player who is a listener. Such footstep data is particularly effective when used for footsteps walking on soft ground (for example, soil, lawn, or fallen leaves). That is, the footsteps walking on the soft ground can be expressed particularly realistically.

  The above process can be performed using a general envelope generator. The envelope generator is software having a function of processing a waveform with respect to an attack time (corresponding to the predetermined time), a decay time, a sustain level, and a release time. Specifically, the attack time is appropriately set according to the type of ground by the envelope generator. As a result, the waveform of the footstep data can be changed so that the amplitude gradually increases from 0 for the portion from the beginning to the time set as the attack time (that is, the beginning portion). FIG. 17 is a diagram illustrating an example of a table used when the attack time is changed according to the type of the ground. FIG. 17 shows a table used when setting the attack time and changing the volume. In the table shown in FIG. 17, the attack time to be set and the degree to which the volume is changed are associated with each type of ground.

  During the game process, the game apparatus performs a process of changing footstep data using the table shown in FIG. This process is performed in place of, for example, step S18 shown in FIG. Specifically, when the ground type is soil, the attack time of the envelope generator is set to 120 (ms), and the volume of the footstep data is multiplied by 1.1. As a result, the waveform of the footstep data is processed so that the amplitude from the beginning of the footstep data waveform to 120 (ms) gradually increases from 0, and the amplitude of the entire footstep data waveform is 1.1. Doubled. In FIG. 17, setting the attack time to 0 (ms) means that the process of changing the amplitude of the footstep data waveform is not performed. For example, when expressing footsteps walking on an iron plate, footsteps that give a hard impression to the player are more realistic and preferable than generating footsteps that give the player a soft impression by the processing.

  FIG. 18 is a diagram illustrating an example in which the waveform of footstep data is changed by setting the attack time. That is, FIG. 18A is a diagram showing a waveform before the change, and FIG. 18B is a diagram showing a waveform after the change. In FIG. 18 (b), it can be seen that the amplitude is smaller at the beginning of the waveform than in FIG. 18 (a). As described above, in other embodiments, the amplitude of the footstep data waveform may be changed by the method described above.

  In this embodiment, the footstep data is changed according to the type of character movement. However, in other embodiments, the footstep data corresponding to the type of character movement is prepared in advance. It may be. In this embodiment, a footstep data group corresponding to the type of ground on which the character exists is prepared in advance. However, in other embodiments, a footstep data is set on the basis of the type of ground on which the character exists. The footstep data included in the data group may be changed.

  The present invention can be used for the purpose of expressing footstep sounds when a character moves more realistically than before.

External view of game system 1 Functional block diagram of game system 1 The figure which shows the data stored in the work memory 32 of the game device 3 in the case of a game process The figure for demonstrating the 1st-4th footstep data The flowchart which shows the flow of the game process performed in the game device 3 which concerns on this embodiment. The flowchart which shows the flow of the game process performed in the game device 3 which concerns on this embodiment. The flowchart which shows the flow of the game process performed in the game device 3 which concerns on this embodiment. The flowchart which shows the flow of the game process performed in the game device 3 which concerns on this embodiment. The flowchart which shows the flow of the game process performed in the game device 3 which concerns on this embodiment. The figure which shows an example of a group specification table The figure which shows an example of a footstep data change table The figure which shows an example of a footstep data change table The figure which shows an example of a footstep data change table The flowchart which shows a part of game process of the modification of this embodiment. The figure which shows the footstep data group in the modification of this embodiment The figure for demonstrating the process which changes footstep data so that an amplitude may increase gradually about the head part of a waveform The figure which shows an example of the table used when changing attack time according to the kind of ground The figure which shows the example which changes the waveform of footstep data by setting attack time

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Game system 2 Television receiver 3 Stationary game device 4 Optical disk 5 Cartridge 6 Controller 31 CPU
32 Work memory 41 Game program 43 Audio data 431, 432, 433 Foot sound data groups 431a, 431b, 431c, 431d Foot sound data

Claims (24)

A game device that sounds a footstep of a character as the character appears in the game space displayed on the display device,
Game image display means for displaying on the display device a game image showing a state in which the character moves on the ground in the game space;
A plurality of footstep data representing footstep data for one step and different footsteps is stored, and a plurality of footstep data used when the condition regarding the state of the character is the same condition is stored in one footstep data group. Footstep data storage means for storing as
A game apparatus comprising: sound generation means for performing sound generation processing using one footstep data selected from the footstep data group at a predetermined timing according to the movement of the character. Further comprising group specifying means for specifying a footstep data group to be used for pronunciation based on the state of the character;
The game device according to claim 1, wherein the sound generation unit selects one footstep data from a footstep data group designated by the group designation unit. The footstep data group includes first footstep data representing the left footstep of the character and second footstep data representing the footstep of the right foot of the character,
The game device according to claim 1, wherein the sound generation means performs sound generation processing using the first and second footstep data alternately. The character moves on four legs,
The footstep data group includes four footstep data representing different footsteps,
The game device according to claim 1, wherein the sound generation means performs sound generation processing using the four footstep data in a predetermined order. In the footstep data group, the first footstep data representing the footstep of the left foot of the character, the second footstep data representing the footstep of the right foot of the character, and the first and second footstep data are different. 3 footstep data and
The game apparatus further includes random determination means for randomly determining whether to use the third footstep data at a predetermined timing according to the movement of the character,
The sound generation means performs sound generation processing by alternately using the first and second footstep data, and when the random determination means determines to use the third footstep data, the first or second footstep data is used. The game apparatus according to claim 1, wherein the sound generation process is performed using the third footstep data instead of the footstep data. In the footstep data group, the first footstep data representing the footstep of the left foot of the character, the second footstep data representing the footstep of the right foot of the character, and the first and second footstep data are different. 3 footstep data and
The game apparatus further includes random determination means for randomly determining whether to use the third footstep data at a predetermined timing according to the movement of the character,
The sound generation means performs sound generation processing by alternately using the first and second footstep data, and the random determination means determines that the third footstep data is to be used, and the past The sound generation process is performed using the third footstep data instead of the first or second footstep data when the third footstep data is not used in a predetermined number of times of the sound generation processing. Game device. Footstep data changing means for changing at least one of the volume, pitch, pitch, and waveform amplitude of the footstep data used for the pronunciation processing based on a predetermined condition relating to the movement of the character;
The game apparatus according to claim 1, wherein the sound generation unit performs a sound generation process using the footstep data changed by the footstep data change unit. The footstep data changing means changes the footstep data for a portion from the beginning of the waveform of the footstep data waveform used for the sound generation processing to a predetermined time by an integration process for adding a predetermined magnification to the amplitude of the waveform,
The game device according to claim 7, wherein the predetermined magnification gradually increases in a range of 0 or more and less than 1 during the integration process. A pronunciation timing calculation means for calculating a timing for performing the pronunciation process based on a predetermined condition relating to the movement of the character;
The game image display means displays the game image on the display device by changing the movement of the character based on the predetermined condition,
The game device according to claim 1, wherein the sound generation unit executes a sound generation process at a timing calculated by the sound generation timing calculation unit.   The game device according to claim 7, wherein the predetermined condition is a condition related to a moving speed of the character. The footstep data group includes first footstep data representing the left footstep of the character and second footstep data representing the footstep of the right foot of the character,
The predetermined condition is that the character is performing skip movement,
The sound generation means includes a process of performing a sound generation process twice using the first footstep data and a process of performing a sound generation process twice using the second footstep data when the character is performing skip movement. The game device according to claim 9, wherein the operations are performed alternately. Footstep data changing means for changing at least one of a volume, a pitch, and a tone length of the footstep data used for the pronunciation processing based on a predetermined condition relating to the movement of the character;
When the sound generation means performs the sound generation process twice using the first or second footstep data, the footstep data changed by the footstep data changing means in at least one of the first and second sound generation processes. The game device according to claim 11, wherein the sound generation process is performed so that the first footstep and the second footstep are different from each other. A game program for causing a computer of a game device to generate a footstep sound of a character along with the movement of a character appearing in a game space displayed on a display device,
A plurality of footstep data representing footsteps for one step and different footsteps,
The footstep data includes a plurality of footstep data used as a single footstep data group when the conditions regarding the character state are the same.
The computer,
Game image display means for displaying on the display device a game image showing a state in which the character moves on the ground in the game space;
A computer-readable game program that functions as sound generation means for performing sound generation processing using one footstep data selected from the footstep data group at a predetermined timing according to the movement of the character. Making the computer further function as a group designating unit for designating a footstep data group to be used for pronunciation based on the state of the character;
14. The game program according to claim 13, wherein the sound generation means selects one footstep data from a footstep data group specified by the group specification means. The footstep data group includes first footstep data representing the left footstep of the character and second footstep data representing the footstep of the right foot of the character,
The game program according to claim 13, wherein the sound generation means performs sound generation processing using the first and second footstep data alternately. The character moves on four legs,
The footstep data group includes four footstep data representing different footsteps,
The game program according to claim 13, wherein the sound generation means performs sound generation processing using the four footstep data in a predetermined order. In the footstep data group, the first footstep data representing the footstep of the left foot of the character, the second footstep data representing the footstep of the right foot of the character, and the first and second footstep data are different. 3 footstep data and
Further causing the computer to function as random determining means for randomly determining whether to use the third footstep data at a predetermined timing according to the movement of the character,
The sound generation means performs sound generation processing by alternately using the first and second footstep data, and when the random determination means determines to use the third footstep data, the first or second footstep data is used. The game program according to claim 13, wherein sound generation processing is performed using the third footstep data instead of the footstep data. In the footstep data group, the first footstep data representing the footstep of the left foot of the character, the second footstep data representing the footstep of the right foot of the character, and the first and second footstep data are different. 3 footstep data and
Further causing the computer to function as random determining means for randomly determining whether to use the third footstep data at a predetermined timing according to the movement of the character,
The sound generation means performs sound generation processing by alternately using the first and second footstep data, and the random determination means determines that the third footstep data is to be used, and the past 14. The sound generation process is performed using the third footstep data instead of the first or second footstep data when the third footstep data is not used in the predetermined number of times of the sound generation processing. Game program. The computer further functions as footstep data changing means for changing at least one of a volume, a pitch, a pitch, and a waveform amplitude of footstep data used for the sound generation processing based on a predetermined condition relating to the movement of the character. Let
14. The game program according to claim 13, wherein the sound generation means performs sound generation processing using the footstep data changed by the footstep data change means. The footstep data changing means changes the footstep data for a portion from the beginning of the waveform of the footstep data waveform used for the sound generation processing to a predetermined time by an integration process for adding a predetermined magnification to the amplitude of the waveform,
The game program according to claim 19, wherein the predetermined magnification gradually increases in a range from 0 to less than 1 during the integration process. Causing the computer to further function as a pronunciation timing calculation means for calculating the timing of performing the pronunciation process based on a predetermined condition relating to the movement of the character;
The game image display means displays the game image on the display device by changing the movement of the character based on the predetermined condition,
The game program according to claim 13, wherein the sound generation unit executes a sound generation process at a timing calculated by the sound generation timing calculation unit.   The game program according to claim 18 or 21, wherein the predetermined condition is a condition relating to a moving speed of the character. The footstep data group includes first footstep data representing the left footstep of the character and second footstep data representing the footstep of the right foot of the character,
The predetermined condition is that the character is performing skip movement,
The sound generation means includes a process of performing a sound generation process twice using the first footstep data and a process of performing a sound generation process twice using the second footstep data when the character is performing skip movement. The game program according to claim 21, wherein: Causing the computer to further function as footstep data changing means for changing at least one of a volume, a pitch, and a pitch of footstep data used for the pronunciation processing based on a predetermined condition relating to the movement of the character;
When the sound generation means performs the sound generation process twice using the first or second footstep data, the footstep data changed by the footstep data changing means in at least one of the first and second sound generation processes. 24. The game program according to claim 23, wherein sound generation processing is performed so that the first footstep and the second footstep are different from each other by using.

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