JP2014063183A - Sound effect generation device and sound effect generation program for achieving sound effect generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To turn, when displaying a three-dimensional image, a sound effect of a depicted scene thereof to a sound to be heard naturally and similarly to an actual world.SOLUTION: An equivalent sound effect generation circuit 30 of the present invention includes: a filter circuit 31 for performing LPF processing; reverberation circuits 35 and 36 for respectively generating reverberation signals of original signals on land and in water; sound volume adjustment circuits 32, 33 and 34 for respectively adjusting sound volumes of the original signals and the reverberation signals; and signal mixing circuits 37 and 38 for mixing the reverberation signals with the original signals. A sound producing position and a sound detecting position to be set movably in the air and in the water in a three-dimensional space are calculated in synchronism with drawing processing, and a combination of media in which the sound generating position and the sound detecting position are present is specified on the basis of a calculation result. By changing the sound volumes of the reverberation signals by the sound volume adjustment circuits 32, 33 and 34 according to the combination of the media in which the sound generating position and the sound detecting position are present, the generated sound of a sound generating body to be heard at the sound detecting position is made natural in each combination.

Description

  In the present invention, when a three-dimensional image of a virtual space in which a sounding body appears is displayed on a display device, the sound emitted by the sounding body in the virtual space is simulated in a predetermined listening position set in the virtual space. TECHNICAL FIELD The present invention relates to a sound effect generating device that generates and outputs sound effects, and in particular, a sound effect generating device capable of generating sound effects suitable for a video game in which game development is displayed as a three-dimensional image, and the sound effect generating device thereof The present invention relates to a sound effect generation program for realizing the above.

  Conventionally, a lot of game software in which game development is displayed as a three-dimensional image has been commercialized. In such game software, for example, a character operated by a player (hereinafter referred to as “player character”) or a character controlled by a computer appears in a three-dimensional game space (virtual game world). A drawing process is performed in which an image obtained by photographing the game space with a virtual camera is created from a viewpoint position set at a predetermined position behind the character and displayed on the game screen.

  In addition, in the process of generating sound effects generated according to game development, particularly sounds generated by characters such as creatures appearing in a virtual game space (for example, operation sounds such as screams and footsteps), the sounds are sent to the player character. A process of generating and outputting a pseudo sound as an audible sound is performed. In particular, the game image is displayed in three dimensions, and the game space is visually expanded for the player. Therefore, even in the sound effect generation process, the character uttered by the character, for example, in the game space The game space is expanded auditorily by applying attenuation according to the distance between the player character and the player character.

  The sound effect generation process described above gives auditory virtual game space a reality close to the real world by simulating the propagation characteristics of sound in the real world. Based on this, various sound effect generation techniques have been proposed.

  For example, in Japanese Patent Laid-Open No. 10-137445, a plurality of viewpoints are provided in a virtual game space, and an image (three-dimensional image) obtained by shooting the game space from each viewpoint is displayed as a game image by selection of the player. There is shown a technique in which the content of a sound effect is changed depending on each viewpoint, and the sound effect is switched to a sound effect corresponding to the viewpoint as the viewpoint is switched.

  Specifically, in a car racing game, the viewpoint can be switched between a predetermined position behind the race car, a driving position of the race car, and a control position of the helicopter that tracks the race car, and the engine sound of the race car is changed. Three waveforms that can be heard at each position are prepared, and the engine sound output from the speaker is switched to the engine sound corresponding to each viewpoint when the viewpoint is switched by the player (the game screen is switched). Thus, the player can experience the engine sound that can be heard at each viewpoint position in a pseudo manner.

  In Japanese Patent Application Laid-Open No. 2008-188308, in a hunting game in which a monster appearing in a game space is captured by a player character that is a hunter, there is a sound insulation between the monster and the hunter. A technique is described for processing the sound volume in a more natural feeling by performing processing that takes into account not only the attenuation due to the distance from the monster to the hunter but also the attenuation or sound insulation by the sound insulation material. ing.

Japanese Patent Laid-Open No. 10-137445 JP 2008-188308 A

  Game software that draws game scenes developed in a virtual game space in recent years with animation technology using 3D computer graphics (Pseudo Graphics) simulates characteristics such as sound propagation characteristics in the real world even in the representation of sound effects Developments are being made to let players hear more realistic sound effects by incorporating realistically simulated content.

  Conventional game software is known in which a space similar to the real world, such as underwater, land, and air, is set as a virtual game space. However, as a technique for generating sound effects, Japanese Patent Application Laid-Open No. 2008-188308 is known. As shown in the Gazette, the volume is basically controlled in consideration of the amount of attenuation corresponding to the distance between the sound generation position and the listening position of the sound and the sound insulation volume due to the sound insulation.

  JP-A-2008-188308 discloses “Monster Hunter (registered trademark)” as an example of game software. In “Monster Hunter (registered trademark)”, there are snowy mountains, volcanoes, forests, caves, deserts, rivers, lakes. It is well known that fields including various natural environments such as sea, sea, etc. are set as monster hunting fields. A variety of monsters appearing in the hunting field are inhabited not only on land but also in the water and in the sand, and move in the water, in the sand, and in the air.

  If you look at the game space (hunting field) of "Monster Hunter (registered trademark)" from the viewpoint of the acoustic environment, it contains multiple media (water, air, rocks, etc.) with different sound propagation characteristics and pitch characteristics (frequency characteristics) A game space is set. There are also game spaces with different reverberation characteristics, such as inside a cave and surrounded by walls and forests.

  Since the monster (sounding body) and the hunter (listening body) move independently from each other, the distance between the two in the game space is not constant, and the medium in which both exist also changes. For example, when a hunter tracks a monster that can move both underwater and on land and in the air (in the air), not only when both are on land but also when both are underwater or one is underwater There are situations where the other is on land, or one is on land and the other is underwater.

  When the positional relationship between a monster (sounding body) and a hunter (listening body) changes between different media, how the sound generated by the monster is heard at the hunter's position is not only the volume based on distance attenuation, It also depends on characteristics such as frequency characteristics and reverberation characteristics.

  Note that the difference in how sounds are heard based on frequency characteristics is when the timbre differs based on the difference in propagation characteristics depending on the frequency.For example, the propagation distance of high-frequency components in water is very short. The sound that can be heard on the ground is an example of a sound that sounds like a sound that has been cut off from a sound that can be heard on land.

  The difference in how sounds are heard based on the reverberation characteristics is when the amount of reverberation components differs depending on the medium based on the propagation characteristics of frequency components differing depending on the medium, and the sound is heard differently. For example, underwater, the propagation distance of low-frequency components is longer than that of land (in the air) and the straightness of sound is high, so the sound that can be heard in water has a higher amount of reverberant components at low frequencies than the sound that can be heard on land. An example is given.

  FIG. 12 is a diagram for explaining that the sound generated by the monster heard by the hunter changes depending on the positional relationship between the monster (sounding body) and the hunter (listening body).

  As shown in FIGS. 4A and 4B, a scene A where a hunter H on land (in the air) listens to the roar S generated by the monster M on land (in the air) and a monster M in the water Compared with the scene B where the hunter H on land listens to the uttered roar S, in the scene A, the roar S of the monster M propagates only in the air, so the volume is controlled mainly based on the attenuation characteristics in the air. Even if the stuttering sound S heard by the hunter H is generated, there is no particular sense of incongruity.

  However, when the monster M roars in the water in the scene B, the roar S propagates in the water and in the air and reaches the hunter H. If the roar S similar to the scene A is output, the unnaturalness remains. become. In particular, in the scene where the monster M moves while scolding from the scene B to the state of the scene A, the roar S of the monster M that can be heard by the hunter H is the moment when the monster M goes out of the water (in the air). The volume and timbre characteristics should change discontinuously.

  Therefore, in consideration of the difference in propagation characteristics due to the medium of the roaring S as described above, a scene where the monster M moves from the water to the land (in the air) while emitting the roaring S, for example, from the water to the land (in the air) At the moment of appearing on the player, it is better for the player to discontinuously change characteristics such as the volume of the roar S (the amplitude of the roar S) and the tone (frequency component of the roar S) of the monster M that can be heard by the hunter H. It gives a natural and realistic auditory effect.

  However, conventional game software does not consider the sound propagation characteristics of different media in the game space, but only controls sound effects taking into account only the sound attenuation characteristics and sound insulation volume due to sound insulation. Depending on various game scenes based on the game development, sound effects such as roaring sounds produced by monsters give the player an unnatural feeling, and there is a point to be improved in the quality of the sound effects.

  Note that the above improvements are not limited to game software. When a 3D image is displayed on a display device, the sound produced by the sounding body in the 3D space that is the target of the 3D image is set in the 3D space. This also applies to the case where a sound that can be heard at a predetermined listening position is generated and output as a sound effect.

  The present invention has been made in view of the above problems, and when displaying a three-dimensional image on a display device, a pseudo-natural feeling close to the real world according to the scene depicted in the three-dimensional image. An object is to provide a sound effect generating device capable of generating sound and outputting it as a sound effect and a sound effect generating program for realizing the sound effect generating device.

  The present invention relates to a computer that generates a sound generated by a sounding body in a virtual space including a plurality of media displayed in a three-dimensional image. A sound effect generating program for processing a sound that can be heard at a position and outputting the sound as a sound effect, wherein the plurality of media includes a first medium and a second medium having different reverberation characteristics When the sounding body starts a sounding operation on the three-dimensional image, the computer obtains original sound data corresponding to the sounding operation from original sound data storage means for storing one or more original sound data emitted by the sounding body. Reading, reproducing the audio signal from the original sound data, and the sound source on the virtual space and the sound source in the period when the original sound data reproducing unit is reproducing the audio signal A position information acquisition unit that acquires position information of a sound position at a predetermined timing; and each time the position information is acquired by the position information acquisition unit, a medium in which the sounding body exists and a medium in which the listening position exists A medium combination specifying means for specifying a combination, and a medium in which the sounding body is present in the processing data storage means and a medium in which the listening position is present each time the combination of the two types of media is specified by the medium combination specifying means A plurality of pieces of processing data for processing predetermined acoustic characteristics including reverberation characteristics including the content and volume of the reverberation signal generated from the original sound data and added to the original sound data. The processing data corresponding to the combination of the two types of media specified by the medium combination specifying means is read out, and the audio signal is added using the processing data. The reverberation signal volume characteristic is different from the sound volume of the reverberation signal when the sounding body and the listening position exist in the same medium. A characteristic of reducing the volume of the reverberation signal when the sounding body and the listening position are present, wherein the sounding body is present in the first medium and the listening position is present in the second medium. The degree of reduction in the volume of the reverberation signal is different from the degree when the sounding body is present in the second medium and the listening position is present in the first medium. A program (claim 1).

  In the sound effect generation program, the three-dimensional image is taken as a game space in which a character or object that can move in the virtual space appears as the sounding body, and is shot with a virtual camera that is set to be movable in the game space. It is a game image, and the listening position may be associated with a position of a character operated by a player among the characters or a position of the virtual camera.

    The present invention includes a program storage unit that stores the sound effect generation program according to claim 1 or 2, and a control unit that executes the sound effect generation program stored in the program storage unit. (3).

  According to the present invention, when a sounding body in a virtual space displayed as a three-dimensional image starts a sounding operation, the original sound data corresponding to the sounding operation is read from the original sound data storage means and reproduced. During the period when the original sound data is being reproduced, the position information of the sounding body and the listening position in the virtual space is acquired at a predetermined timing, and based on the position information, the medium where the sounding body exists and the medium where the listening position exists A combination is specified.

  Each time a combination of media is specified, processing data (for processing characteristics such as frequency components of the original sound data, attenuation due to distance, volume change due to medium change, etc.) corresponding to the combination of the media from the processing data storage means Data) is read out, and the audio signal being reproduced is processed using the processed data. As a result, the reproduced sound of the original sound data changes in accordance with the change in the relative positional relationship between the sounding body displayed in the three-dimensional image and the listening position, so that the sounding sound of the sounding body can be heard as much as possible. You can make it sound more natural to the real world.

  In particular, the sound characteristics, such as the volume, tone color, and volume changes that accompany changes in the medium, are reflected in the sound effect generation process, so that the sound can be heard discontinuously when the sounding body moves between different media. Can be expressed in a pseudo manner, and naturalness can be given depending on how the sound is heard.

It is a figure which shows an example of the game screen of the area containing the lake and the land of a snowy mountain. 1 is a front view showing an overview of a video game device that executes a game program including a sound effect generation program according to the present invention. It is a block diagram which shows the internal structure of a video game device. It is a figure for demonstrating the production | generation method of a three-dimensional game image. It is a figure which shows an example of original sound data. It is a figure which shows an example of an attenuation characteristic. It is the figure which showed the contents, such as an attenuation process, a filtering process, and a reverberation process, in four different situations. It is a figure which shows the equivalent sound effect generation circuit implement | achieved by running the sound effect generation processing program which concerns on this invention. It is a flowchart which shows the production | generation process sequence of the sound effect which concerns on this invention. It is a flowchart which shows the process sequence which determines the process condition of FIG.9 S10. It is a figure which shows an example of the change of the waveform of the sound effect produced | generated by the sound effect production | generation process which concerns on this invention. It is a figure for demonstrating that the generation | occurrence | production sound of the monster heard by a hunter changes with the positional relationship of a monster (sounding body) and a hunter (listening body).

  As a preferred embodiment of the present invention, a case where a sound effect generation program according to the present invention is applied to game software will be specifically described with reference to the drawings.

  In the following description, a series of game software called “Monster Hunter (registered trademark)” will be described as an example. However, when the sound effect generation program according to the present invention is applied to the game software, the sound effect depends on the game image. Since the contents correspond to the displayed game scene, first, Monster Hunter (registered trademark) will be briefly described focusing on game scenes mainly related to sound effect generation.

  Monster Hunter (registered trademark) makes a hunter (player character) that is a player's alternation appear in a virtual society (virtual game space) inhabited by various monsters that are enemy characters, and that hunter subverts or captures the monster, Receive orders from people who exist in the virtual society, such as the collection of animals and plants such as mushrooms and fish (hereinafter referred to as “quests”), and earn rewards for achieving those quests and living in that virtual society. It is a hunting action game whose content is to do.

  The virtual game space where the monsters inhabit has an environment similar to the actual natural environment. For example, a plurality of monster habitats such as snowy mountains, dense forests, deserts, and swamps (hereinafter referred to as “hunting fields”). ) Is provided.

  Each hunting field is divided into multiple areas (hunting grounds). For example, in a snowy mountain hunting field, it is surrounded by an area including a lake and land at the foot of the snowy mountain, an ice cave area connected to the snowy mountain, and a mountain wall in the back of the mountain. Area, open area near the summit. The monster that appears in the snowy mountain lives while moving in the plurality of areas, and the player operates the operation button to move the hunter to any of the plurality of areas to search for the monster. If the hunter meets a monster in any area, the player can confront the hunter with the monster, and if the monster is subjugated (set the monster's physical strength to zero) or captured, the quest is achieved.

  As mentioned above, each hunting field has monsters inhabited not only on land and in the air, but also underwater, etc. Depending on the type of monster, it moves not only on land and in the air, but also underwater, in the sand and in the ground. There is something to do. For this reason, locations where hunters can search for monsters include not only land but also underwater.

  Looking at the hunting field from the viewpoint of the acoustic environment, for example, the area including the lake and the land at the foot of the snowy mountain is “air” on land and in the air, as shown in FIGS. The water is occupied by “water” and is an area occupied by two types of media having different acoustic characteristics (characteristics such as sound propagation characteristics and reverberation characteristics). FIG. 1 (b) shows a vertical section of the portion taken along the line II in FIG. 1 (a) so that the vertical positional relationship between the hunter H and the monster M can be understood.

  Assuming that the virtual game space has acoustic characteristics similar to those of the real world, even if the hunter H and the monster M are in the same area in the air area A1 and the water area A2, the monster M of the hunter H It is natural that the way sounds (eg, stuttering S) are heard is different. Even if Hunter H is on land and Monster M is underwater, or Hunter H is underwater and Monster M is on land, the sound of the roar S generated by Hunter H's monster M is different. Is the same. Such an acoustic environment is similar in a hunting field that includes areas occupied by air and areas occupied by liquids other than water.

  As described above, in the “Monster Hunter (registered trademark)” of the game software according to the present embodiment, the virtual game space has a natural environment close to the real world, and there are 2 game scenes displayed on the game screen. An area occupied by a medium having different acoustic characteristics of at least types is included, and the hunter H and the monster M are configured to be movable. Therefore, for example, how to hear the hunter H of the roar S generated by the monster M is not only the distance relationship between the hunter H and the monster M in the game space, but also the area (medium) or hunter where the hunter H and the monster M exist respectively. It is affected by the reflection of sound around the position where H exists. The same applies not only to the roar S generated by the monster M but also to various sounds such as collision sounds, explosion sounds, and vibration sounds generated by other characters and objects appearing in the game space.

  Therefore, the sound effect generation program according to the present invention is generated in the game space regardless of how the positional relationship between the hunter H and the monster M, other characters, or objects in the game space changes in consideration of the acoustic environment described above. The method of generating sound effects is devised so that the sound is heard in a natural way according to the positional relationship.

  Next, a video game apparatus that executes a game program including a sound effect generation program according to the present invention will be described.

  FIG. 2 is a front view showing an overview of a video game apparatus that executes a game program including a sound effect generation program according to the present invention.

  The video game apparatus 1 (hereinafter abbreviated as “game apparatus 1”) is a portable video game machine. Although this embodiment is a portable video game machine, other types of game machines such as home video game machines and commercial video game machines (arcade game machines) arranged in game centers are used as game devices. Can be used.

  The game program including the sound effect generation program according to the present invention and the game data necessary for the game program are recorded on a dedicated portable recording medium (hereinafter referred to as “game media”). Provided to. When a user inserts game media into a game media mounting section (not shown) of the game device 1, the game device 1 reads a game program and game data from the game media into a memory (RAM) in the device, and a CPU (Central Processing Unit). ) Starts executing the game program. Thereby, the user can enjoy the game software on the game apparatus 1. In the arcade game machine, the game program and the game data are integrally incorporated in the game machine main body, so that it is not necessary to attach the game media to the arcade game machine when playing the game.

  The game apparatus 1 has a main body 2 made of a horizontally long rectangular thin rectangular parallelepiped. A display 3, which is a game screen, is disposed at the center of the upper surface of the main body 2, and operation keys 4 including a direction key 4a and a joystick key 4b on the left and right of the display 3 and operation buttons 5 including four buttons are respectively provided. It is arranged. The direction key 4 a and the joystick key 4 b are arranged vertically, and a pair of speakers 9 a and 9 b for outputting sound effects are disposed below the joystick key 4 b and the operation button 5.

  The operation key 4 mainly designates the moving direction of the player character (hunter) that is the operation target of the player displayed on the display 3, or designates the selection direction for selecting the selection item displayed on the menu screen. It is the operation member for doing. For example, in the case of a hunting action game, the operation button 5 is an operation member for giving various action commands such as an attack action and a defense action to the player character mainly against an enemy character (monster) during the game.

  From the speakers 9a and 9b, sounds corresponding to various events that occur in the BGM during game progress and game development (for example, a roar S generated by a monster, an attack sound attacked by a monster, and an object such as a rock collapse due to the attack) Sound that produces a sound or a game effect (for example, an effect when a hunter damages or receives damage from a monster).

  At the bottom of the display 3, operation buttons such as a “START” button 6, a “SELECT” button 7, and a volume adjustment button 8 are arranged. The “START” button 6 is an operation button for mainly instructing “game start” at the start of the game, and the “SELECT” button 7 is an operation button for selecting a game operation mode mainly at the start of the game. is there. Although not shown, a media mounting part for mounting a power button and game media is provided on the side of the main body 2.

  FIG. 3 is a block diagram showing an internal configuration of the game apparatus 1.

  The game apparatus 1 includes a CPU 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, a drawing data generation processor 14, a drawing processing processor 15, a VRAM (Video-RAM) 16, and a D / A (Digital-Analog). It includes a converter 17, a display unit 18, an audio processor 19, an amplifier 20, a speaker 21, an operation unit 22, a driver 23, and a bus 24.

  The display unit 18 corresponds to the display 3 in FIG. 2, and the speaker 21 corresponds to the speakers 9a and 9b in FIG. The operation unit 22 corresponds to the operation buttons 4, the operation buttons 5, the “START” button 6, the “SELECT” button 7, the volume adjustment button 8, and the like, and the power button (not shown). . When these operation members are operated by the player, an operation signal is input from the operation unit 22 to the CPU 11.

  The CPU 11, ROM 12, RAM 13, drawing data generation processor 14, drawing processing processor 15, sound processing processor 19, and driver 23 are connected to each other via a bus 24 so that data can be transmitted.

  A game program and game data are recorded on the game media 10. The game data includes character and background image data, image data for displaying information such as status, player characters (hunters), enemy characters (monsters), and objects (other animals and plants) that appear in BGM and game space. Sound data related to sound effects such as various kinds of sounds, message data using characters and symbols, and the like. The acoustic data includes, for example, processing contents such as original sound data, original sound volume and frequency component adjustment values, parameter values for generating reverberation component data from the original sound data (described later), and reverberation component volume adjustment values. Various data used in the sound effect generation program according to the present invention such as data for designating are included. Details of the acoustic data will be described later.

  The ROM 12 stores a basic program indicating a basic function of the game apparatus 1 such as a disk loading function, a game program stored in the game media 10 and a procedure for reading game data, and the like. The RAM 13 stores a game program and game data read from the game media 10 by the driver 23, and provides a storage area necessary when the CPU 11 executes the game program stored in the RAM 13. When the game apparatus 1 employs a UMD (Universal media Disc) (registered trademark), which is a kind of optical disc, as the game media 10, the driver 23 is configured by an optical disc driver.

  When the game media 10 is loaded in the media loading unit (not shown), the CPU 11 operates the driver 23 according to the basic program in the ROM 12 and reads the game program and game data necessary for starting the game from the game media 10 into the RAM 13. Set to the game start state. Thereafter, the CPU 11 performs overall control of game progress and game development by executing a game program read into the RAM 13 based on a player operation signal from the operation unit 22.

  Monster Hunter (registered trademark) is composed of a collection of a plurality of independent game programs. For example, as described above, a hunting field has a snowy mountain field, a dense forest field, a desert field, a swamp field, etc., but each of these fields is composed of a plurality of hunting areas. A game program for controlling the game progress has been created.

  Therefore, for example, in the control of the game progress in the hunting field, every time a hunting area is selected by the player, the game program of the hunting area is read from the game media 10 into the RAM 13, and the hunting is executed by the CPU 11 executing the game program. The game progress in the area is controlled. The same applies to the process of game progress in other game scenes, and a game program and game data required in accordance with the player's selection operation are read from the game media 10 into the RAM 13, and the game program is executed by the CPU 11 executing the game program. Progress and game development are controlled.

  The game program describes processing procedures and various instructions to be executed by the CPU 11. The game program for controlling the game progress in each area of the hunting field includes a program for controlling the movement of the monster M and the movement of other objects. Therefore, when the CPU 11 executes the game program, the operation of the monster M and the movement of other objects in the game space are automatically controlled.

  The spear movement of the monster M is also described in the game program that controls the movement of the monster M. When the CPU 11 executes the spear command, the CPU 11 outputs information on the stutter sound S corresponding to the spear command to the voice processor 19. Then, the sound processor 19 performs the output process of the stuttering S.

  On the other hand, the game program for controlling the operation of the hunter H is basically configured such that the operation is controlled by an operation signal from the operation unit 22 based on the operation of the operation keys 4 and the operation buttons 5 by the player. Therefore, when the player's operation signal is input from the operation unit 22, the CPU 11 performs a process for causing the hunter H to perform a predetermined operation on the operation signal according to the game program, and displays the processing result on the display unit 18. It displays as a game image to show. In addition, when an event that generates a sound effect occurs due to the action of the hunter H (such as an attack sound on the monster M or an attack sound generated by the monster M), the CPU 11 determines the sound effect calculated based on the processing result. The information is output to the sound processor 19, and the sound processor 19 performs the sound effect generation process. Details of the sound effect generation process will be described later.

  As the game image, a three-dimensional (3D) animation image created by an animation technique using three-dimensional computer graphics is used. As shown in FIG. 4, the three-dimensional game image is a predetermined position CP behind the hunter (player character) H (a position at a height h behind the position HP of the hunter H by a distance d in the horizontal direction). ), And an image obtained by photographing the hunter H side with the virtual camera C is generated as an image of each frame.

  The image extends from the virtual camera C to the hunter H side, and the sight line of the hunter H, the monster M, or the background is at a position where the line of sight intersects the screen virtually placed between the virtual camera C and the hunter H. This is a drawing (two-dimensional image by perspective projection method) depicting another object such as a mountain.

  When the hunter H moves in the game space by the player's operation of the directional key 4a or the joystick key 4b, the virtual camera C moves with the hunter H while generating images of each frame, so that the game screen has a game space. An image of the hunter H moving within is displayed.

  The virtual camera C in the game space moves with the hunter H. In the present embodiment, since the hunter H is set to move not only on land but also in other medium areas such as underwater, the virtual camera C is also underwater when the player moves the hunter H underwater. It moves and the image of the search scene of the monster M in the water and the battle scene with the monster M is displayed.

  Further, the player can move only the virtual camera C by operating the direction key 4a or the joystick key 4b while the hunter H is stopped. For example, the player can rotate the virtual camera C around the hunter H or switch the position of the virtual camera C to the position of the hunter H eye. Therefore, the player can move only the virtual camera C to a predetermined position in the area of another medium such as underwater without moving the land-based hunter H.

  In the present embodiment, as will be described later, the position CP of the virtual camera C in the game space is set to the listening position TP of the sound generated in the game space (the sound generated by the character or object appearing in the game space). In the sound effect generation processing, sounds generated in the game space such as the roar S of the monster M are processed into sounds that can be heard at the listening position TP and output.

  In addition, when creating an image of each frame or generating a sound effect, the virtual camera C and the position in the game space of objects such as the hunter H, monster M and other objects appearing in the game space are defined, Since information on these positional relationships (distance and direction) is required, the game space in each area is provided with XYZ coordinate systems orthogonal to each other as shown in FIG.

  Although the origin of the XYZ coordinate system can be arbitrarily set, in this embodiment, the virtual camera C and the hunter H move underwater, and the underwater scene is displayed as a game scene, as shown in FIG. In the game space of an area including two different adjacent media, the XYZ coordinate system is set so that the zero reference of the Z coordinate is set to the position of the water surface (medium boundary) as shown in FIG. The Therefore, for example, when an area game space is set in an area surrounded by the + X axis and + Y axis on the XY plane, the X coordinate and Y coordinate of an object appearing in the game space are both positive values. The coordinates are positive when the object is on land or in the air, and are negative when the object is in water.

  Returning to FIG. 3, the drawing processing of the game image (3D animation image) to be displayed on the display unit 18 is mainly performed by the drawing data generation processor 14 and the drawing processing processor 15. The CPU 11 determines the content of the game image to be displayed on the display unit 18 based on the player's operation signal from the operation unit 22, and the image data (background, player character (hunter H) and others required for drawing the image) (Data such as polygon data, texture data, light source data, etc.) of the character (monster M) and other objects are read from the RAM 13 and supplied to the drawing data generation processor 14. Further, the CPU 11 supplies operation information input from the operation unit 22 to the drawing data generation processor 14.

  Based on the image data and operation information supplied from the CPU 11, the drawing data generation processor 14 generates data necessary for drawing (the positional relationship between the virtual camera C, the hunter H, the monster M and the background and other objects in perspective projection, the screen screen (Equivalent to the screen of the display unit 18) The coordinates of the polygons that make up the hunter H, monster M and background and other objects above, and data such as texture and reflection characteristics corresponding to each polygon) are calculated, and the calculation results are drawn. This is supplied to the processor 15.

  Based on the drawing command from the CPU 11, the drawing processor 15 uses the data supplied from the drawing data generation processor 14 every 1/30 seconds to display images of each frame of the three-dimensional animation displayed on the display unit 18 (see-through). 2D image by projection method). Connected to the drawing processor 15 is a VRAM 16 for creating an image of each frame.

  The VRAM 16 is provided with a buffer area (hereinafter referred to as “screen buffer”) for storing image data of each frame displayed on the display unit 18. The drawing processor 15 temporarily stores the data supplied from the drawing data generation processor 14 in the work area of the VRAM 16, reads out data necessary for an image to be displayed from this work area every 1/30 seconds, and stores it in the screen buffer. Repeat the development process (drawing process).

  The image data developed in the VRAM 16 is converted to an analog signal by the D / A converter 17 and output to the display unit 18 for display.

  When the CPU 11 performs a process of generating a sound effect by executing the game program, the sound effect to be output from the speaker 21 determined by the result of the process (the roaring sound S of the monster M or the attacking action or the defensive action of the hunter M). The content of the generated sound or the like is output to the sound processor 19, sound data corresponding to the sound effect is generated, and the sound data is output from the speaker 21.

  The sound processor 19 reads out sound effect data from the RAM 13 on the basis of the sound effect generation command from the CPU 11, performs necessary digital signal processing, and then performs D / A conversion to a sound signal (analog signal). The required digital signal processing includes sound effect generation processing according to the present invention. The audio signal output from the audio processor 19 is amplified with a predetermined gain by the amplifier 20 and then output from the speaker 21.

  Next, regarding the sound effect generation processing according to the present invention, the position of the monster M is set to the sound generation position MP (refer to the position of MP in FIG. 1), and the position HP of the hunter H is set to the listening position TP (refer to the position of HP in FIG. 1). ), And a case where the stuttering sound S generated by the monster M is output as a sound heard at the listening position TP will be described as an example. In the above description, the position CP of the virtual camera C is set as the listening position TP. However, the hunter H appears in the game space as a player's alternation, and the player listens to the sound generated by the monster M through the hunter H. Since it is assumed, for convenience of explanation, the position HP of the hunter H is referred to as the listening position TP and is expressed as “listening position HP”.

  As described above, Monster Hunter (registered trademark) is configured such that a monster M as a sounding body and a hunter H as a hearing body can move not only on land in the game space but also underwater. Therefore, for example, in the case of the area shown in FIG. 1, when the positional relationship between the hunter H and the monster M is classified, if the monster M and the hunter H exist on the land, the monster M exists on the land and the hunter H is in the water. When the monster M exists in the water and the hunter H exists on the ground, the monster M and the hunter H can be divided into four types of situations.

And if you organize the four types of situations by the relationship between the position of pronunciation and listening sound and the medium,
(1) When the sound generation position MP and the listening position HP are both on land (in the air) (case 1)
(2) When the sound generation position MP is in water and the listening position HP is on land (in the air) (Case 2)
(3) When the sound generation position MP is on land (in the air) and the listening position HP is in water (Case 3)
(4) When the sound generation position MP and the listening position HP are both underwater (Case 4)
It can be divided into four cases.

  In the following description, expressions expressed in cases (MP, HP) are used as appropriate so that the contents of cases 1 to 4 can be intuitively understood. According to this notation, case 1 = case (land, land), case 2 = case (underwater, land), case 3 = case (land, underwater), and case 4 = case (underwater, underwater).

  In the real world, the way in which sound waves are transmitted and the attenuation characteristics differ between air and water. For example, (a) a high frequency of several kHz or more in water has a large attenuation and a short propagation distance. It is known that underwater people have straight sound. In the present embodiment, with reference to the characteristics of (a) and (b), the volume, frequency component, and reverberation component characteristics of the original sound data in the four cases 1 to 4 are processed differently. As the situation of the game scene represented by the game image changes from case 1 to case 4 every moment, the processing of the corresponding case is performed on the original sound data, so that the sound of the game scene in each case Is produced so that the auditory effect given to the player in the game is as natural as possible.

  Therefore, in this embodiment, a plurality of types of processing programs are provided for processing the characteristics of the volume, frequency component, and reverberation component for the original sound data. The original sound data is, for example, original voice waveform data created in advance in order to output a stuttering sound S in response to a spear movement of the monster M. The original sound data includes, for example, data obtained by converting the analog audio signal W shown in FIG. 5 into a digital signal and compressed by, for example, ADPCM (Adaptive Differential Pulse Code Modulation), and is included in the sound data of the game data. When the monster M emits a plurality of kinds of calls, original sound data is created in advance for each call. The same applies to the original sound data of sounds generated by characters and objects other than the monster M.

  As the processing program, there are provided a processing program that functions as a tool that gives a sound effect in water (water medium) and a processing program that functions as a tool that gives a sound effect in land (air medium). Specifically, there are provided an attenuation processing program for producing an attenuation effect with respect to a distance and a filtering processing program for producing a timbre difference due to a difference in frequency components in water and in air. Further, a reverberation processing program for adding reverberation (reverb) is provided as an effector for expressing a difference in how sounds are heard based on differences in sound wave propagation characteristics between underwater and air.

  For the attenuation processing program, for example, attenuation data D1 (attenuation data D1 for land) indicating attenuation characteristics when sound propagates through the air shown in FIG. 6 and attenuation characteristics when sound propagates through water are shown. Attenuation data D2 (underwater attenuation data D2) is preset. In the real world, low-frequency sound is less likely to attenuate in water than in the air. However, in this embodiment, the attenuation amount of the underwater attenuation data D2 is used to produce a sense of underwater sealing as an auditory effect of the game. Is made larger than the attenuation amount of the attenuation data for land D1. By processing the original sound data by the attenuation processing program using the distance L between the sound generation position MP and the listening position HP and the attenuation data shown in FIG. 6, the listening level at the listening position HP is calculated.

  In FIG. 6, the horizontal axis indicates the distance L (m) from the sound generation position, and the vertical axis indicates the volume level. Since the audio data is 8-bit digital data (128 tone data), the maximum value of the volume level is “127” and the minimum value is “0”. In FIG. 6, the maximum value is normally set to “1”. It is a content that shows the volume level. This is the percentage of volume that should be reduced with respect to the original sound data, that is, the gain for volume adjustment can be directly read.

  Therefore, for example, in the case (land, land), when the distance between the sound generation position MP and the listening position HP is Lr, the sound volume level is “Kr”, which is a gain for adjusting the sound volume, so the sound generation position MP. Is set to “S”, the volume of the listening position HP is reduced to Kr × S (0 <Kr <1.0).

  The acoustic data includes a plurality of types of original sound data set in advance, but the volume of each original sound data is not the same, and the original sound data may be different. Since the maximum value of the volume level on the vertical axis in FIG. 6 corresponds to the maximum volume of all the original sound data, the maximum of the land attenuation data D1 and the underwater attenuation data D2 illustrated in FIG. The value is not “1” because it is a value normalized with respect to the maximum volume.

  As shown in FIG. 6, both the onshore attenuation data D1 and the underwater attenuation data D2 have a shape in which the waveform slightly rises in the vicinity of the generation position but then decreases monotonously (curved downward). doing. The underwater attenuation data D2 has a larger attenuation with respect to the distance L than the land attenuation data D1.

  The waveform of the attenuation data shown in FIG. 6 is an example, and considering that the sound effect according to the present invention is a sound effect in a game and some creativity and exaggeration are recognized, the waveform is appropriately changed. Can be added. The attenuation data is included in the game data as acoustic data.

  As the filtering processing program, for example, a processing program for a low-pass filter that cuts high frequency components of 1200 Hz (cutoff frequency fc) or higher is provided. A waveform of the original sound is changed by performing filtering processing on the original sound data by a processing program of a low-pass filter. In the example of FIG. 5, since the high frequency component of 1200 Hz or higher of the audio signal W is removed, the portion of the waveform that changes sharply becomes gentle and changes to a sound that is audibly audible. In the present embodiment, when the listening position HP is underwater, the filtering process is performed on the original sound data. This is because the high frequency component of the sound is cut to produce a feeling of being heard like sound in water.

  Therefore, in the case (land, land), filtering processing is not performed on the original sound data of the roar S generated by the monster M. However, in the case (underwater, underwater), the roar S generated by the monster M is not filtered. Since the filtering process is performed on the original sound data, the high-frequency component higher than the cut-off frequency fc is cut from the stuttering sound S output as the sound effect. In the case (underwater, underwater), the case (land, land) It becomes a muffled sound lower than the case.

  Similarly to attenuation data, reverberation data indicating reverberation characteristics in water (underwater reverberation data) and reverberation data indicating reverberation characteristics in air (land reverberation data) are set in advance for the reverberation processing program. Yes. The reverberation data is data for digitally processing “reverb”, which is one of effectors, and adds reverberation to the original sound. In the present embodiment, reverb is used as an effector that effectively produces a difference in how the sound is heard in the air and in the water. In reverb, reverberant sound data is generated from the original sound data. The reverberant data is data indicating the characteristics of parameters such as pre-delay, reverb time, high-frequency attenuation, crosstalk, and reverberation signal intensity during the generation process. It is.

  Reverberation is generally said to have a structure in which a reverberant reflection sound is generated after an initial reflection occurs within a few milliseconds to 100 milliseconds after a direct sound is heard. Since the initial reflection is combined with the direct sound and recognized as a series of sounds, the late reflection is recognized as a reverberant sound separately from the direct sound.

  The pre-delay is for setting the delay time of the reverberant sound with respect to the direct sound, and a long value is set in a place where the distance between the sound source and the reflection wall is long. Since the sound reaches farther in the water than in the air, the difference between the sound in the water and the air can be produced by making the pre-delay of the reverberation characteristics in the water longer than in the air.

  The reverberation time sets the time for which the reverberant sound lasts. When the reflection wall or reflection path with a high reflectivity is long, the reverberation time is long because the attenuation is small. The reverberation time of the reverberation characteristics in water is an element that can produce a difference between sound in water and air by making it longer than in air.

  The high frequency attenuation is for setting the attenuation amount of the high frequency component included in the reverberant sound. Since the sound in water has less high frequency components than in the air, the reverberant sound is an element that can produce a difference between sound in water and air by attenuating the high frequency components.

  Crosstalk sets the degree of reverberant interaction between channels. For example, when there is a sound source on the L channel side, the straightness of the sound from the sound source can be expressed as the output amount of the reverberant sound from the R channel is reduced. Since the straightness of sound is higher in water than in air, reducing the crosstalk of the reverberation characteristics in water lower than in air is an element that can produce a difference in sound between water and air.

  The reverberant signal intensity sets the magnitude of the reverberant sound (the volume of the reverberant component). For the same reason as the pre-delay and reverb time, the reverberation signal intensity is also an element that can produce a difference between sound in water and air by making the reverberation signal intensity of reverberation characteristics in water larger than in air.

  Compared to land (in the air) underwater, (1) reverberation components reach far, (2) strong straightness of sound propagation, (3) a lot of noise such as water currents, Considering the feature that the reverberation component becomes relatively small, for example, each parameter of the underwater reverberation data for wide water without a reflection wall is, for example, pre-delay: setting time is “short”, “medium”, “ When divided into three "long", set to "long", reverb time: set the time to "short", "medium", "long", set to "long", high frequency attenuation: When the frequency range to be attenuated is divided into “low range”, “mid range”, and “high range”, the attenuation range is set to “middle range” and “high range”, and crosstalk: Crosstalk volume is set When it is divided into “Small”, “Medium”, and “Large”, it is set to “Small”. The amount "small", "medium", if that were divided into three "large", has been set, and the "large".

  On the other hand, for example, each parameter of land reverberation data for a large grassland without reflection walls is set to pre-delay: “short”, reverb time: set to “short”, high frequency attenuation: set attenuation range to “high” (Attenuation range is set higher than underwater), Crosstalk: Set from “Small” to “Medium” (Set larger than underwater), Resonance signal strength: Set to “Small”.

  In addition, the difference of each parameter of said reverberation data for underwater and reverberation data for land shows a general tendency. The reverberation characteristics are affected not only by the sound propagation characteristics of the medium, but also by reflectors and reflectors around the sound generation position. It may be the same as the parameters of reverberation data, or may be opposite to the above tendency. The same applies to game scenes on the water.

  Therefore, the land reverberation data includes a plurality of reverberation data in which the above parameters are appropriately changed according to game scenes having different reflection characteristics (for example, an open grassland scene and a cave scene). Yes. For example, for land reverberation data in a cave, pre-delay is set to “medium” because it reverberates in the space inside the cave, and reverb time is set to “medium” (because it echoes in the space inside the cave), high frequency attenuation : Attenuation range is set to “Low”, Crosstalk is set to “Large” (because the echo sound diffuses due to reflection of the cave wall), and Echo signal strength is set to “Large”.

  The same applies to underwater reverberation data that includes a plurality of reverberation data whose parameters are appropriately changed according to game scenes having different reflection characteristics.

  FIG. 7 shows sound effect generation processing in the four cases described above. Specifically, FIG. 7 shows attenuation processing, filtering processing, reverberation processing, etc. in each case (land, land), case (underwater, land), case (land, underwater), and case (underwater, underwater). The contents are shown.

  In FIG. 7, “Presence / absence of LPF processing” is a column indicating whether or not to perform low-pass filtering processing. “Type of attenuation characteristics” is a column indicating whether to use land-based attenuation data or underwater attenuation data. “Volume change rate Kd due to medium change” is a column indicating the rate of change in sound volume resulting from reflection of sound at the boundary of the medium when the sound travels through different media. “Land reverberation characteristics (addition amount Krv)” is a column indicating whether or not to use terrestrial reverberation characteristics, and “Underwater reverberation characteristics (addition amount Krv)” is whether or not to use underwater reverberation characteristics. It is a column which shows. Further, (addition amount Krv) in both columns indicates a volume ratio when a reverberation sound generated from the original sound is added to the original sound.

  As shown in FIG. 7, LPF processing is not performed when the sound generation position MP is onshore (case (land, underwater) and case (land, land)), and when the sound generation position MP is underwater (case (underwater, land). ) And case (underwater, underwater)). This is a process for producing a feeling of underwater by cutting high frequency components of the original sound data when the sound source is underwater.

  Regarding the application of the attenuation characteristics, when the listening position HP is on land (case (underwater, land) and case (land, land)), the land attenuation data (see attenuation data D1 in FIG. 6) is applied, and the listening position is When HP is underwater (case (land, underwater) and case (underwater, underwater)), underwater attenuation data (see attenuation data D2 in FIG. 6) is applied. Applying land attenuation data in case (land, land) and applying water attenuation data in case (underwater, underwater) is to create both attenuation data for each corresponding case. Therefore, it is a natural application.

  On the other hand, in the case (underwater, land), there are underwater sections and land sections in the sound propagation path from the sound generation position MP to the listening position HP. However, in this embodiment, in order to simplify the attenuation process on the condition that the sound is naturally heard as much as possible, in this embodiment, One of the underwater attenuation data is applied, and the attenuation data of the medium at the listening position HP (see the land attenuation data D1) is applied. The same applies to the case (land, underwater), and the underwater attenuation data D2 is set to be applied.

  In the “volume change rate Kd due to medium change” column, when the propagation path from the sound generation position MP to the listening position HP includes both underwater and land, the volume is discontinuous due to sound reflection at the boundary surface. The processing for expressing the decrease is shown. When the sound propagation path is only underwater or on land (case (land, land) and case (underwater, underwater)), there is no medium boundary surface. The content to be processed at 0.0, that is, the content to be processed without changing the volume.

  On the other hand, when the sound propagation path includes both underwater and land (case (underwater, land) and case (land, underwater)), there is a boundary surface of the medium. In order to express, the contents in the same column are the contents for processing the change rate Kd of the volume with a value smaller than 1.0. In the present embodiment, the volume is set to be reduced by 0.6 times in the case (underwater, land), and the volume is reduced by 0.5 times in the case (land, underwater). Since these volume change rates Kd are design matters, other numerical values can be set as appropriate.

  Regarding the application of reverberation characteristics, reverberation data for land is applied when the listening position HP is onshore (case (underwater, land) and case (land, land)), and when the listening position HP is underwater (case (land, Underwater) and case (underwater, underwater)) reverberation data for underwater is applied. The reason for applying land reverberation data in case (land, land) and underwater reverberation data in case (underwater, underwater) is to create both reverberation data for each corresponding case. Therefore, it is a natural application as in the case of application of the attenuation characteristic.

  On the other hand, the reason why the attenuation data of the medium at the listening position HP is applied in the case (underwater, land) and the case (land, underwater) is the same reason as in the case of applying the attenuation characteristic. . Accordingly, the reverberation data for land is applied in the case (underwater, onshore), and the reverberation data for underwater is applied in the case (land, underwater).

  In addition, since there is a medium change in the propagation path in case (underwater, land) and case (land, underwater), the reverberation effect is lower than in case (land, land) and case (underwater, underwater). In view of this, processing for reducing the volume level of the reverberation component is performed. The added amount Krv of the terrestrial reverberation characteristic in the case (underwater, land) is set to 0.8 (reverberation sound volume is reduced to 80%), and the added amount Krv of the underwater reverberation characteristic in the case (land, underwater) is set to 0. A value of 5 (the volume of the reverberant sound is reduced to 50%) indicates that the processing is performed.

  The additional amount Krv of the reverberation characteristics of the case (land, underwater) is made smaller than the additional amount Krv of the reverberation characteristics of the case (underwater, land). Therefore, it reflects the reverberation characteristics of the medium before the medium changes. In the state before the medium changes, the case (underwater, land) has more reverberation components than the case (land, underwater). The reverberation component is larger in (underwater, land) than in the case (land, underwater). Since the additional amount Krv of these reverberation components is also a design matter, other numerical values can be set as appropriate.

  FIG. 8 is a diagram showing an equivalent sound effect generation circuit realized by executing the sound effect generation processing program according to the present invention.

  The sound effect generating circuit 30 shown in the figure includes a filter circuit 31, three volume adjusting circuits 32, 33, 34, two reverb circuits 35, 36, and two signal mixing circuits 37, 38. Composed.

  In the sound effect generation circuit 30, an audio signal (original sound data) is input to the filter circuit 31, and an output signal of the filter circuit 31 is input to the first signal mixing circuit 37 via the first volume adjustment circuit 32. . The output signal of the filter circuit 31 is input to the first reverb circuit 35 and the second reverb circuit 36. The output signal of the first reverb circuit 35 is input to the first signal mixing circuit 37 via the second volume adjustment circuit 33, and the output signal of the second reverb circuit 36 is input via the third volume adjustment circuit 34. And input to the second signal mixing circuit 38. In the first signal mixing circuit 37, the output signal of the filter circuit 31 input via the first volume adjustment circuit 32 and the output signal of the first reverb circuit 35 input via the second volume adjustment circuit 33. And the second signal mixing circuit 38 mixes the output signal of the second reverb circuit 36 and the output signal of the first signal mixing circuit 37 input via the third volume adjustment circuit 34. The mixed signal is output as a sound effect.

  The filter circuit 31 is a low-pass filter that can set a cutoff frequency fc from the outside. When the cut-off frequency fc is set, the filter circuit 31 operates as a low-pass filter. When the cut-off frequency fc is not set, the filter circuit 31 functions as a circuit that allows an input signal to pass through (a circuit without a filter function). The filter circuit 31 is a circuit that performs LPF processing corresponding to the “LPF processing presence / absence” column in FIG. 7. If “Yes” is set in the “LPF processing presence / absence” column, the filter circuit 31 performs filtering. When the cutoff frequency fc is set in the circuit 31 and “none” is set, the cutoff frequency fc is not set in the filter circuit 31 from the CPU 11.

  The first volume adjustment circuit 32 is a circuit that performs attenuation processing corresponding to the columns of “type of attenuation characteristics” and “volume change rate Kd due to medium change” in FIG. The first volume adjustment circuit 32 receives volume adjustment information from the CPU 11 and adjusts the level of the output signal of the filter circuit 31 using the volume adjustment information.

First volume control circuit 32, the level of the audio signal S _LF output from the filter circuit 31 is multiplied by a coefficient K1 to adjust the volume of the audio signal S _LF. Accordingly, when the coefficient K1 is set as the volume adjustment value of the first volume adjustment circuit 32, the volume adjustment value K1 is input from the CPU 11 to the first volume adjustment circuit 32. The volume adjustment value K1 is a level Kr or Kr ′ calculated from the ratio Kd in the column “Volume change rate Kd due to medium change” in FIG. 7 and the land attenuation data D1 or the underwater attenuation data D2 shown in FIG. Is a value calculated by multiplying (Kd × Kr or Kd × Kr ′).

  For example, if the distance L between the sound generation position MP and the listening position HP is Lr (see FIG. 6), the CPU 11 determines the level Kr of the point Pr and “change in volume due to medium change” if the case (land, land). The volume adjustment value K1 = 1.0 × Kr is calculated by multiplying the ratio Kd = 1.0 in the “rate Kd” column, and the calculated value is set in the first volume adjustment circuit 32. If it is a case (underwater, underwater), the CPU 11 sets the volume adjustment value K1 = 1.0 × Kr ′ calculated using the level Kr ′ of the point Pr ′ instead of the level Kr to the first volume adjustment circuit. Set to 32.

  In the case (underwater, land), the CPU 11 multiplies the level Kr of the point Pr by the ratio Kd = 0.6 in the “volume change rate due to medium change” column, and the volume adjustment value K1 = 0.6 ×. Kr is calculated, and the calculated value is set in the first volume adjustment circuit 32. In the case (land, underwater), the CPU 11 multiplies the level Kr ′ of the point Pr ′ by the ratio Kd = 0.5 in the “volume change rate due to medium change” column, and the volume adjustment value K1 = 0.5 ×. Kr ′ is calculated, and the calculated value is set in the first volume adjustment circuit 32.

Therefore, the first signal mixing circuit 37 receives a sound signal of K1 × S _LF (0 <K1 ≦ 1).

The first reverberation circuit 35 and the second volume adjustment circuit 33 are circuits that perform attenuation processing corresponding to the column “land reverberation characteristics (addition amount Krv)” in FIG. The first reverb circuit 35 includes a signal indicating whether or not to operate the circuit from the CPU 11 (signal with / without reverb) and reverberation data for land (pre-delay, reverb time, high frequency attenuation, crosstalk, echo signal strength, etc.) Each parameter data) is input. When a signal with reverb is input from the CPU 11, the first reverb circuit 35 operates as a reverberation circuit for land and generates a reverberation signal Srv using the audio signal S _LF input from the filter circuit 31.

  The second volume adjustment circuit 33 is a circuit that adjusts the volume of the reverberation signal Srv by multiplying the level of the reverberation signal Srv output from the first reverb circuit 35 by the volume adjustment value K2 (0 <K2 ≦ 1). is there. This volume adjustment value K2 is calculated by multiplying the additional amount Krv in the “land reverberation characteristics (addition amount Krv)” column of FIG. 7 by the level Kr calculated by the land attenuation data D1 shown in FIG. Value (Krv × Kr). Since the reverberation signal Srv also needs to be attenuated due to distance, the added amount Krv is multiplied by the level Kr calculated by the land attenuation data D1, similarly to the volume adjustment value K1.

  Therefore, in the case (land, underwater) and case (underwater, underwater), the reverberation signal Srv is not output from the second volume adjustment circuit 33 because the first reverb circuit 35 does not function as a reverb circuit. The reverberation signal Srv is not input to the first signal mixing circuit 37.

  On the other hand, in the case (land, land) and case (underwater, land), the reverberation signal Srv is generated from the first reverb circuit 35 based on the land reverberation data, and the level of the reverberation signal Srv is the second. The volume is adjusted to K2 times by the volume adjustment circuit 33 and input to the first signal mixing circuit 37. That is, in the case (land, land), the level of the reverberation signal Srv is adjusted to K2 = Krv × Kr = Kr times and input to the first signal mixing circuit 37, and the case (underwater, land). The level of the reverberation signal Srv is adjusted to K2 = Krv × Kr = 0.8 × Kr times and input to the first signal mixing circuit 37.

  The second reverb circuit 36 and the third volume adjustment circuit 34 are circuits that perform attenuation processing corresponding to the column of “underwater reverberation characteristics (addition amount Krv)” in FIG. The configuration and operation of the second reverb circuit 36 are the same as those of the first reverb circuit 35 described above except that the information in the column of “underwater reverberation characteristics (addition amount Krv)” and underwater reverberation data are used. . The configuration and operation of the third volume adjustment circuit 34 are also described above except that the level Kr ′ calculated from the information in the “underwater reverberation characteristics (addition amount Krv)” column and the underwater attenuation data D2 is used. This is the same as the second volume adjustment circuit 33.

  Therefore, in the case (land, land) and case (underwater, land), the reverberation signal Srv is not output from the third volume adjustment circuit 34 because the second reverb circuit 36 does not function as a reverb circuit. The reverberation signal Srv is not input to the second signal mixing circuit 38.

  On the other hand, in the case (land, underwater) and case (underwater, underwater), a reverberation signal Srv is generated from the second reverb circuit 36 based on the reverberation data for underwater, and the reverberation signal 34 is generated by the third volume adjustment circuit 34. The level is adjusted by multiplying the level of the signal Srv by a volume adjustment value K3 (0 <K3 ≦ 1), and then input to the second signal mixing circuit 38. The third volume adjustment circuit 34 receives the level Kr ′ calculated from the added amount Krv in the column of “underwater reverberation characteristics (added amount Krv)” from the CPU 11 and the underwater attenuation data D2 shown in FIG. A value (Krv × Kr ′) calculated by multiplication is set as the volume adjustment value K3.

  In the case (underwater, underwater), the level of the reverberation signal Srv is adjusted to K3 = Krv × Kr ′ = Kr ′ times and input to the second signal mixing circuit 38. The level of the reverberation signal Srv is adjusted to K3 = Krv × Kr ′ = 0.5 × Kr ′ times and input to the second signal mixing circuit 38.

In the first signal mixing circuit 37, the audio signal K 1 × S _LF from the filter circuit 31 whose level is adjusted by the first volume adjustment circuit 32 and the level adjustment is performed by the second volume adjustment circuit 33. The reverberation signal K2 × Srv is mixed. In the second signal mixing circuit 38, the mixed signal (K1 × S _LF + K2 × Srv) output from the first signal mixing circuit 37 and the third volume adjustment circuit 34 are used. The reverberation signal K3 × Srv whose level has been adjusted is mixed.

Since only one of the first reverb circuit 35 and the second reverb circuit 36 operates, the sound effect generation circuit 30 outputs the audio signal K1 × S _LF whose level is adjusted by the first volume adjustment circuit 32. A mixed signal (K1 × S _LF + K2 × Srv) obtained by mixing the reverberation signal K2 × Srv from the first reverb circuit 35 whose level is adjusted by the second volume adjustment circuit 33, and the audio signal K1 × S _LF One of the mixed signals (K1 × S _LF + K3 × Srv) obtained by mixing the reverberation signal K3 × Srv from the second reverb circuit 36 whose level is adjusted by the third volume adjustment circuit 33 is output as a sound effect. .

  Next, sound effect generation processing according to the present invention will be described with reference to the flowcharts of FIGS. In the following description, the generation process of the roaring S in a scene where the monster M emits the roaring S at a certain timing of game development will be described. In the above description, the listening position TP is the position HP of the hunter H. However, in the description of the flowcharts of FIGS. 9 and 10, the position CP of the virtual camera C is the listening position TP and described as the “listening position TP”. To do.

  The game image is displayed as a moving image on the display unit 18 by repeating the operation of generating a frame image in the VRAM 16 every 1/30. When the CPU 11 shifts to a process of executing a program for generating the roar S of the monster M during the game developed by displaying the game image on the display unit 18, the CPU 11 reads the sound from the acoustic data stored in the RAM 13. The original sound data of the sound S is read out, and the generation process of the stuttering sound S is performed by the equivalent sound effect generating circuit 30 shown in FIG.

  Since the original sound data is data having a soot waveform at time t as shown in FIG. 5, when the original sound data is reproduced without any processing, the time t elapses from the start of the occurrence of the soot S. When a game image in which the monster M performs a predetermined operation such as a change in posture or movement is displayed on the display unit 18, the original sound data is reproduced as it is during the period in which the monster M is performing the operation. That is, in this case, each circuit in the equivalent sound effect generating circuit 30 of FIG. 8 is operated until the time t has passed with the default value set at the start of the generation of the stuttering S.

  In the sound effect generation processing according to the present invention, the monster M (sound generation position MP) and the virtual camera C position CP (listening position TP) in the game space are set every 1/30 during the time t when the original sound data is reproduced. To calculate. Then, the position information of the monster M (sound generation position MP) and the position CP (listening position TP) of the virtual camera C is used in accordance with the update of the game image displayed on the display unit 18 based on the positional relationship between the two. Processing for changing the operation waveform set in each circuit in the sound effect generating circuit 30 (condition set according to the contents of each column in FIG. 7) and changing the reproduction waveform of the original sound data during reproduction of the original sound data. Done.

  Therefore, the loop processing of steps S2 to S12 in the flowchart shown in FIG. 9 shows a processing procedure that is repeatedly performed every 1/30. In this processing procedure, each circuit in the equivalent sound effect generation circuit 30 in FIG. A process for updating the set operating conditions and processing the original sound data is performed.

  First, when the monster M emits a roaring sound S (when the CPU 11 performs the sound effect generation process of the game program), the original sound data of the roaring sound S is read from the acoustic data stored in the RAM 13. (S1). Subsequently, the coordinates of the position of the monster M in the game space are acquired (S2). As shown in FIG. 1A, a three-dimensional Cartesian coordinate system XYZ is set in the game space, and the operation of the monster M is controlled by the computer. Therefore, in the game image drawing process, XYZ The coordinates (Xm, Ym, Zm) of the monster M in the coordinate system are automatically calculated every 1/30 seconds. Also, the coordinates (Xc, Yc, Zc) in the XYZ coordinate system of the virtual camera C are set to default values on the initial screen of each area, and 1/30 according to the operation amount of the moving operation by the operation key 4 of the player. Since the default value is updated every second, the updated value is acquired as the coordinates of the virtual camera C.

  In the present embodiment, since a three-dimensional image of the monster M or hunter H in the water is displayed on the display unit 18, as shown in FIG. 1B, the Z coordinate of the orthogonal coordinate system XYZ is water and air. Is defined as “0”, the + direction indicates a land (in the air) area A1, and the − direction indicates an underwater area A2. Therefore, whether or not the monster M or the virtual camera C is underwater is determined by whether or not the Z coordinate value is negative.

  Subsequently, it is determined whether or not the monster M is underwater by determining whether or not the Z coordinate value (Zm) of the monster M is Zm ≦ 0 (S3). If the monster M exists in the water (S3: YES), the flag F1 is set to “1” (S4). If the monster M does not exist in the water, that is, if the monster M exists on the land (S3: NO), the flag F1 is set to “0” (S5).

  The flag F1 is a flag indicating whether or not the monster M exists in the water, and is set to “0” (indicating that it exists on land) as a default value in the initial state in which the flowchart of FIG. 9 is started. Has been. Therefore, F1 = 1 indicates that it exists in water, and F1 = 0 indicates that it exists on land.

Subsequently, the coordinates (X _TP , Y _TP , Z _TP ) of the listening position TP in the game space are acquired (S6). In this description, since the position CP of the virtual camera C is the listening position TP, (X _TP , Y _TP , Z _TP ) = (Xc, Yc, Zc) is acquired.

    Subsequently, it is determined whether or not the virtual camera C is underwater by determining whether or not the Z coordinate value (Zc) of the virtual camera C is Zc ≦ 0 (S7). If the virtual camera C is underwater (S7: YES), the flag F2 is set to “1” (S8). If the virtual camera C is not underwater (S7: NO), the flag F2 is set to “0”. (S9).

  The flag F2 is a flag indicating whether or not the virtual camera C (accurately, the listening position TP) is in water. In the initial state where the flowchart of FIG. Is set). Thus, F2 = 1 indicates that it is in water and F2 = 0 indicates that it is on land.

  Subsequently, based on the setting state of the flags F1 and F2 and the content of the sound effect generation process shown in FIG. 7, processing conditions for each circuit of the equivalent sound effect generation circuit 30 in FIG. 8 are determined (S10). ).

  FIG. 10 is a diagram showing a processing procedure for determining the processing conditions in step S10.

  When the process proceeds to step S10, it is determined which one of the four cases in FIG. 7 corresponds to the sound effect generation scene based on the setting contents of the flags F1 and F2. That is, if the setting contents of the flags F1 and F2 are 2-bit information of (F1, F2), if (F1, F2) = (0, 0) (S21: NO, S23: NO), the sound effect The case of the generation scene is determined to be a case (land, land) (S24), and if (F1, F2) = (0, 1) (S21: NO, S23: YES), the case of the sound effect generation scene is the case (Land, underwater) is determined (S25). If (F1, F2) = (1, 1) (S21: YES, S22: YES), the case of the sound effect generation scene is determined to be a case (underwater, underwater) (S26), (F1, F2). ) = (1, 0) (S21: YES, S22: NO), the case of the sound effect generation scene is determined to be a case (underwater, land) (S27).

  Then, a sound effect generation condition corresponding to the case determined in steps S24 to S27, that is, an operation condition for each circuit of the equivalent sound effect generation circuit 30 is set (S28).

  That is, when (F1, F2) = (0, 0), the cut-off frequency fc of the LPF process is determined to be “0” according to the operation condition of case 1 in FIG.

Further, the distance Lr = √ [(Xm−Xc) ² + (Ym−Yc) ² + (Zm) from the coordinates (Xm, Ym, Zm) of the monster M and the coordinates (Xc, Yc, Zc) of the virtual camera C -Zc) ² ] is calculated, and the volume level Kr at the distance Lr is set from the distance Lr and the land attenuation data D1 shown in FIG. Also, the volume adjustment value K1 = Kr for the first volume adjustment circuit 32 is set from the volume level Kr and the volume change rate Kd = 1.0 in the “volume change rate Kd due to medium change” column.

  Further, data of parameters such as pre-delay, reverb time, high frequency attenuation, crosstalk, and reverberation signal intensity to be set in the first reverb circuit 35 is determined based on the reverberation data for land. Further, the volume adjustment value K2 for the second volume adjustment circuit 33 is set to “Kr” by multiplying the additional amount Krv = 1.0 of the reverberation signal Srv by the level Kr calculated by the land attenuation data D1 shown in FIG. It is determined. Since the underwater reverberation data is not used, it is determined not to operate the second reverb circuit 36, and the volume adjustment value K3 for the third volume adjustment circuit 34 is not set.

  In the case of (F1, F2) = (1, 0), the cut-off frequency fc of the LPF process is determined according to the operation condition of case 2 in FIG. In the above description, only the cut-off frequency fc of 1200 Hz is shown as an example. However, as a whole game, there are cases where a cut-off frequency fc is provided for each area, and a plurality of cut-off frequencies are set in the game scene of each area. Therefore, in step S28, a cut-off frequency fc corresponding to the current game scene is determined.

  Further, a distance Lr between the coordinates (Xm, Ym, Zm) of the monster M and the coordinates (Xc, Yc, Zc) of the virtual camera C is calculated, and the distance Lr and the distance from the land attenuation data D1 shown in FIG. A volume level Kr at Lr is set. Also, the volume adjustment value K1 = 0.6 × Kr for the first volume adjustment circuit 32 is set from the volume level Kr and the volume change rate Kd = 0.6 in the column “volume change rate Kd due to medium change”. The

  Further, data of parameters such as pre-delay, reverb time, high frequency attenuation, crosstalk, and reverberation signal intensity to be set in the first reverb circuit 35 is determined based on the reverberation data for land. Further, the volume adjustment information value K2 for the second volume adjustment circuit 33 is “0.0” by multiplying the additional amount Krv = 0.8 of the reverberation signal Srv by the level Kr calculated by the land attenuation data D1 shown in FIG. 8 × Kr ”. Since the underwater reverberation data is not used, it is determined not to operate the second reverb circuit 36, and the volume adjustment value K3 for the third volume adjustment circuit 34 is not set.

  In the case of (F1, F2) = (0, 1), the cut-off frequency fc of the LPF process is determined to be “0” according to the operation condition of case 3 in FIG.

  Further, a distance Lr between the coordinates (Xm, Ym, Zm) of the monster M and the coordinates (Xc, Yc, Zc) of the virtual camera C is calculated, and the distance Lr and the distance from the underwater attenuation data D2 shown in FIG. A volume level Kr ′ at Lr is set. Further, from this volume level Kr ′ and the volume change rate Kd = 0.5 in the “volume change rate Kd due to medium change” column, the volume adjustment value K1 = 0.5 × Kr ′ for the first volume adjustment circuit 32 is obtained. Is set.

  Further, data of parameters such as pre-delay, reverb time, high frequency attenuation, crosstalk, and reverberation signal intensity to be set in the second reverb circuit 36 is determined based on the underwater reverberation data. Further, the volume adjustment value K3 for the third volume adjustment circuit 34 is “0..0” by multiplying the additional amount Krv = 0.5 of the reverberation signal Srv by the level Kr ′ calculated by the underwater attenuation data D2 shown in FIG. 5 × Kr ′ ”. Since land reverberation data is not used, it is determined that the first reverb circuit 35 is not operated, and the volume adjustment value K2 for the second volume adjustment circuit 33 is not set.

  In the case of (F1, F2) = (1, 1), the cut-off frequency fc of the LPF process is determined according to the operation condition of case 4 in FIG. Further, a distance Lr between the coordinates (Xm, Ym, Zm) of the monster M and the coordinates (Xc, Yc, Zc) of the virtual camera C is calculated, and the distance Lr and the distance from the underwater attenuation data D2 shown in FIG. A volume level Kr ′ at Lr is set. Also, the volume adjustment value K1 for the first volume adjustment circuit 32 is set to “Kr ′” by multiplying the volume level Kr ′ by the volume change rate Kd = 1.0 in the “volume change rate Kd due to medium change” column. Is set.

  Further, data of parameters such as pre-delay, reverb time, high frequency attenuation, crosstalk, and reverberation signal intensity to be set in the second reverb circuit 36 is determined based on the reverberation data for underwater, and the amount of reverberation signal Srv added. After multiplying Krv = 1.0 by the level Kr ′ calculated by the underwater attenuation data D2 shown in FIG. 6, the volume adjustment value K3 for the third volume adjustment circuit 34 is determined to be “Kr ′”. Since land reverberation data is not used, it is determined that the first reverb circuit 35 is not operated, and the volume adjustment value K2 for the second volume adjustment circuit 33 is not set.

  When the processing conditions are determined in step S10, the processing conditions are set in each circuit of the equivalent sound effect generating circuit 30 in FIG. 8, and predetermined processing is performed in each circuit on the original sound data and output. The volume, tone color (frequency component), and reverberation characteristics of the sound effect being applied are changed (S11).

  The processes in steps S2 to S11 are repeated until the reproduction time t of the original sound data of the roar S passes from the start of the generation of the roar S of the monster M (loop process of S2 to S12). When the reproduction time t of the original sound data elapses (S12: YES), the sound effect generation process ends.

  FIG. 11 is a diagram showing an example of a change in the sound effect waveform generated by the sound effect generation processing according to the present invention. The horizontal axis of FIGS. 9A to 9D indicates time, and the vertical axis indicates the level of the noise S.

  The figure (a) shows the waveform of the roar S when the virtual camera C is fixed at a predetermined position on the land and the monster M moves away from the virtual camera C while roaming on the land. b) shows the waveform of the roar S when the virtual camera C is fixed at a predetermined position in the water and the monster M moves away from the virtual camera C while roaming in the water.

  The case (a) corresponds to the case (land, land) during the period when the noise S is generated, and the case (b) is the case (underwater, all the period during which the noise S is generated. In (a), the sound effect generation process is performed under the conditions of case 1 in FIG. 7, and in (b), the sound effect generation process is performed under the conditions of case 4 in FIG. Accordingly, the levels of the waveform (a) and the waveform (b) continuously change (attenuate) and do not become discontinuous. Further, since the filtering process of the low pass filter is performed in the case (underwater, underwater), the waveform of the noise S has less high frequency components than the case (land, land). The reason why the roaring S of (a) has a jagged short waveform, while (b) has a rounder waveform than (a) and has a slightly longer period is the filtering. It shows that it depends on the effect of processing.

  FIG. 8C shows a state where the virtual camera C is fixed at a predetermined position on the land, and as shown in FIG. The waveform of the roar S when moving in a direction away from the virtual camera C along the path back to (d) is shown. FIG. 4D shows that the virtual camera C is fixed at a predetermined position in the water, and the monster M becomes (c). The waveform of the roar S when the same movement operation is performed is shown.

  In the figure (c), among the periods in which the roar S is occurring, the period T1 in which the monster M is first in the water corresponds to the case (underwater, land), and the period in which the monster M appears in the air. T2 corresponds to the case (land, land), and the period T3 when the monster M is finally in the water corresponds to the case (underwater, land).

  Therefore, in the period T1 and the period T3, the sound effect generation process is performed under the condition of the case 2 in FIG. 7, and in the period T2, the sound effect generation process is performed under the condition of the case 1 in FIG. The level of the noise S becomes discontinuous at the boundary N1 and at the boundary N2 between the period T2 and the period T3. In addition, the low pass filter filtering process is performed in the case 2 process. However, since the filtering process is not performed in the case 1 process, the waveforms in the periods T1 and T3 are rounder than the waveform in the period T2, and the period is shorter. A slightly longer waveform. When the process of Case 2 is changed to the process of Case 1, in the process of Case 2, the volume level is reduced to 0.6 × Kr times by the volume change rate Kd and the distance attenuation Kr due to the medium change. Then, since the volume level reduction processing is not performed, in (c), the levels of the periods T1 and T3 are lower than those of the period T2.

  In the same figure (d), among the periods when the roar S is occurring, the period T1 in which the monster M is first in the water corresponds to the case (underwater, underwater), and the period in which the monster M appears in the air. T2 corresponds to the case (land, underwater), and the period T3 when the monster M is finally in the water corresponds to the case (underwater, underwater).

  Therefore, in the period T1 and the period T3, the sound effect generation process is performed under the condition of case 4 in FIG. 7, and in the period T2, the sound effect generation process is performed under the condition of case 3 in FIG. The level of the noise S becomes discontinuous at the boundary N1 between the periods T1 and T2 and at the boundary N2 between the periods T2 and T3. In addition, the low pass filter filtering process is performed in the case 4 process, but the filtering process is not performed in the case 1 process. Therefore, the waveforms in the periods T1 and T3 are rounder than the waveform in the period T2, and the period is longer. The point which becomes a little long waveform also becomes the same tendency as (c). On the other hand, when the process of case 4 is changed to the process of case 3, the volume level is reduced by a factor of 0.5 × Kr ′ by the volume change rate Kd and the distance attenuation Kr ′ due to the medium change. Contrary to (c), the level of the period T2 is lower than that of the periods T1 and T3.

  As described above, according to the game apparatus 1 to which the sound effect generation method according to the present embodiment is applied, two types of regions (in the air and underwater) occupied by media having different acoustic characteristics are provided in the game space. When the monster M which is a sound generator and the hunter H (or virtual camera C) which is a sound body are set to be movable in both areas, the sound attenuation characteristics, frequency characteristics and reverberation characteristics of each area are provided. Four combinations of the area where the monster M exists in the game space and the area where the hunter H (or virtual camera C) exists (case (land, land), case (underwater, land), case (land, underwater), case ( The combination of underwater and underwater)) and sound effect attenuation characteristics, frequency characteristics and reverberation characteristics according to the distance between the monster M and the hunter H are processed. In it is possible to output a monster M (pronunciation position) and Hunter H (listening position) and sound effects sound natural as much as possible in accordance with the positional relationship is a change in that location relationship changed freely of.

  In particular, the positional relationship between the monster M (sound generation position) and the hunter H (listening position) is obtained in synchronization with the generation of the frame image of the game image, and the sound effect generation processing is performed based on the positional relationship. As shown in (c) and (d), it is expressed in a pseudo manner that the sound effect changes discontinuously at the moment when the monster M moves from the water to the land or in the opposite direction. It is possible to produce an auditory effect close to the real world according to the scene depicted by the sound effect in the three-dimensional game image.

  In the above-described embodiment, the description has been given of the water and the air as examples of the two regions of the medium having different acoustic characteristics. However, the medium having different acoustic characteristics is not limited thereto. That is, if the liquid region and the gas region are divided into two regions having different media, the liquid region type is not limited to water, and any liquid type can be applied. Any type of gas can be applied. In addition, in the game software, it is possible to create a liquid or gas that does not exist in the real world, so an arbitrarily created liquid or gas may be applied.

  Further, not only liquid but also a fluid region by a solid such as sand may be applied, and three or more different regions of adjacent media may be provided.

  In the above embodiment, reverb is used as an effector for producing the difference between underwater and air. For example, an effector for adding other reverberation and reverberation such as delay and echo, and an auditory such as chorus and flanger. An effector that produces the above fluctuation may be used. In addition, as the main elements for producing the difference between underwater and air, the effect of the reverb is effective because the change in volume at the medium boundary and the difference in frequency characteristics due to the low-pass filter are more prevalent than the effector such as reverb. It may be omitted and the processing may be simplified.

  In the above embodiment, the sound generation position MP is set to the position of the monster M. However, the sound generation position MP does not have to be set to the position of the monster M accurately, and is set to a character that is a sound generation body or an arbitrary position in the vicinity thereof. It may be set. The same applies to the listening position TP, and it is not necessary to accurately set the position of the hunter H or the virtual camera C, and the character serving as the listening body may be set to any position in the vicinity of the virtual camera or its periphery.

  In the above embodiment, the processing of the original sound data at the reproduction time t of the original sound data is synchronized with the generation operation of the game image (every 1/30 seconds), but the timing of the processing is arbitrary. Can be set. For example, a cycle that is an integral multiple of the frame image generation cycle may be set.

  In the above embodiment, the sound effect generation processing according to the present invention is mainly performed by the sound processing processor 19, but the CPU 11 and the sound processing processor 19 may jointly perform the sound processing processor 19. It may be omitted and performed by the CPU 11.

  In the above embodiment, the case of generating the sound effect of the game apparatus 1 has been described. However, the sound effect generation technique according to the present invention is not limited to the sound effect of the game, and the display device has a three-dimensional image other than the game, For example, the present invention can also be applied to the case where sound effects are added to the video when displaying a photographed image or a demonstration image.

DESCRIPTION OF SYMBOLS 1 Video game device 2 Main body 3 Display 4a Direction key 4b Joystick key 5 Operation button 6 "START" button 7 "SELECT" button 8 Volume control button 9a, 9b Speaker 10 Game media 11 CPU
12 ROM
13 RAM
14 drawing data generation processor 15 drawing processor 16 VRAM
17 D / A converter 18 Display unit 19 Audio processor 20 Amplifier 21 Speaker 22 Operation unit 23 Driver 24 Bus 30 Sound effect generation circuit 31 Filter circuit 32, 33, 34 Volume adjustment circuit 35, 36 Reverb circuit 37, 38 Signal mixing circuit

Claims (3)

Sound generated by a sound generator generated in a virtual space including a plurality of media displayed in a three-dimensional image, at a predetermined listening position set in the virtual space. And a sound effect generation program that functions as a sound effect generation device that outputs the sound effect as a sound effect,
The plurality of media includes a first medium and a second medium having different reverberation characteristics,
The computer,
When the sounding body starts a sounding operation on the three-dimensional image, the original sound data corresponding to the sounding operation is read out from the original sound data storing means for storing one or more original sound data emitted by the sounding body, and the original sound data is read from the original sound data. An original sound data reproducing means for reproducing an audio signal;
Position information acquisition means for acquiring position information of the sounding body and the listening position in the virtual space at a predetermined timing during a period in which the original sound data reproduction means reproduces the audio signal;
Each time the position information is acquired by the position information acquisition means, medium combination specifying means for specifying a combination of the medium in which the sound generator is present and the medium in which the listening position is present;
Each time the combination of the two types of media is specified by the medium combination specifying unit, the processing data storage unit stores in advance each combination of the medium in which the sounding body exists and the medium in which the listening position exists. Specified by the medium combination specifying means from among a plurality of processing data for processing a predetermined acoustic characteristic including a reverberation characteristic including a content and volume of a reverberation signal generated from the original sound data and added to the original sound data Read out the processing data corresponding to the combination of the two types of media, and function as audio signal processing means for processing the audio signal using the processing data;
The volume characteristic of the reverberation signal is such that the reverberation in the case where the sounding body and the listening position are in different media with respect to the volume of the reverberation signal when the sounding body and the listening position are in the same medium. A characteristic that reduces the volume of the signal,
The degree to which the volume of the reverberation signal is reduced when the sounding body is present in the first medium and the listening position is present in the second medium is that the sounding body is present in the second medium. A sound effect generating program characterized by being different in degree from the case where the listening position is present in the first medium.   The three-dimensional image is a game image in which a character or object capable of moving in the virtual space appears as the sounding body, and is a game image taken with a virtual camera set to be movable in the game space, and the listening position The sound effect generation program according to claim 1, wherein the sound effect generation program is associated with a position of a character operated by a player among the characters or a position of the virtual camera.   3. A sound effect generation comprising: a program storage unit storing the sound effect generation program according to claim 1; and a control unit executing the sound effect generation program stored in the program storage unit. apparatus.

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