JP2005208166A - Sound simulation device and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device specifying a propagation path in real time without placing any excessive calculation load on an arithmetic part even when the position relation between two bodies in a space changes at any time and outputting a sound after signal processing of sound effects of reflection, diffraction, localization, etc., according to the propagation path. <P>SOLUTION: Propagation paths of sound waves from sound sources arranged in a space having a plurality of virtually divided regions to a listening body are previously calculated while various states in which position relations between both are different are assumed to prepare a table containing path candidate information obtained in the calculation stage by combinations of regions where the sound sources are arranged and regions where the listening body is arranged. When positions of a sound source and the listening body are inputted, the accurate path of the sound wave from the sound source to the listening body can be determined by using the path candidate information corresponding to the combination of the regions where they are disposed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an acoustic simulation apparatus.

When a sound is output from a sound source located in a certain region to a listener located in another region, a system that generates and outputs a sound that is likely to be observed by the listener is proposed. Yes. As a document disclosing such a system, there is, for example, Patent Document 1. This document discloses a navigation system that guides an obstacle between a vehicle and a target building by acoustic change to a driver of the vehicle. According to the document, this system measures the current position of the vehicle at any time using GPS (Global Positioning System), while there is an obstacle that blocks sound waves between the measured current position and the target building. It is determined whether there is, that is, whether the sound wave emitted from the target building can be directly propagated to the vehicle. As a result, when there is no path through which the sound wave directly propagates, sound that expresses only the diffracted wave that will diffract the obstacle is output from the speaker, while when there is a path through which the sound wave directly propagates, The sound expressing the synthesis of the diffracted wave and the direct wave is output from the speaker. In this way, by changing the sound localization according to the presence or absence of an obstacle that blocks the propagation of sound waves, the positional relationship between the vehicle and the target object in an environment in which the object is disturbed can be grasped sensuously.
JP 2002-131072 A

By the way, the propagation path of a sound wave emitted from an object located in a specific area in a space toward an object located in another specific area is all possible to block the sound wave in that space. Until now, it has been generally specified by calculating whether or not a line (a surface if the space is three-dimensional) and a line segment connecting both objects intersect. This conventional method will be described with a relatively simple example. For example, as shown in FIG. 8, the sound source S and the listener L have a line segment e sandwiched between rectangles formed by line segments a to d. In the case of the arranged line segment, the line segment e is the first to shield the sound wave by calculating for each of the line segments a to e whether or not the line connecting the sound source S and the listener L intersects. I was able to identify it. For this reason, as in the navigation system described above, even when the positional relationship between two objects in the space fluctuates at any time and the search for the propagation path in real time is required, the search for the propagation path is performed by the conventional method described above. If this is done, there is a problem that an extremely large calculation load is imposed on the calculation unit.
The present invention has been devised to solve such a problem, and does not place an excessive calculation load on the arithmetic unit even in a situation where the positional relationship between two objects in the space fluctuates as needed. It is an object of the present invention to provide a device that can specify a propagation path in real time and output sound that has been subjected to signal processing of acoustic effects such as reflection, diffraction, and localization according to the propagation path.

  An acoustic simulation device according to a preferred aspect of the present invention is an area in which a sound source is arranged in a space having a plurality of virtually divided areas, assuming a plurality of arrangements of sound sources and listening bodies in the space. And a storage unit that stores one or a plurality of sound wave propagation path candidates from the sound source to the listener, a signal input unit that inputs an acoustic signal, and a sound source A position input unit that inputs sound source position information indicating the position of the sound source and listener position information indicating the position of the listener, and a first region specifying unit that specifies a region where the sound source is located based on the sound source position information; , Based on the position information of the listener, a second region specifying unit that specifies a region where the listener is located, a region specified by the first region specifying unit, and a region specified by the second region specifying unit Associated with the combination A path candidate reading unit that reads out the propagation path candidate from the storage unit, a signal processing unit that performs signal processing corresponding to the read propagation path candidate on the acoustic signal input from the signal input unit, and the signal processing unit And a signal output unit that outputs an acoustic signal subjected to signal processing.

  An acoustic simulation apparatus according to another preferred embodiment of the present invention assumes a plurality of arrangements of sound sources and listening bodies in the space in a space having a plurality of virtually divided regions, and the sound sources are arranged. A storage unit for storing one or a plurality of sound wave propagation path candidates from the sound source to the listener, and a signal input unit for inputting an acoustic signal A position input unit that inputs sound source position information indicating the position of the sound source and listener position information indicating the position of the listener, and a first area specifying that specifies an area where the sound source is located based on the sound source position information A second region specifying unit that specifies a region where the listener is located, a region specified by the first region specifying unit, and a second region specifying unit based on the position information of the listener Corresponding to the combination with the selected area A path candidate reading unit that reads out the propagation path candidates read out from the storage unit, and evaluating the read out propagation path candidates based on the positional relationship between the sound source and the listening body. A path determination unit that determines a propagation path of a sound wave, a signal processing unit that applies signal processing corresponding to the determined propagation path to an acoustic signal input from the signal input unit, and signal processing performed by the signal processing unit. And a signal output unit that outputs the acoustic signal.

  An acoustic simulation program according to another preferred aspect of the present invention assumes a plurality of arrangements of sound sources and listening bodies in the space in a space having a plurality of virtually divided regions, and the sound sources are arranged. A storage unit that stores one or a plurality of sound wave propagation path candidates from the sound source to the listener, and a signal input unit that inputs an acoustic signal. From the position input unit to the computer device including a position input unit that inputs sound source position information indicating the position of the sound source and listener position information indicating the position of the listener, and a signal output unit that outputs an acoustic signal. Based on the input sound source position information, the first region specifying process for specifying the region where the sound source is located, and the region where the listener is located is specified based on the listener position information input from the position input unit. A propagation path candidate associated with a combination of the second area specifying process, the area specified in the first area specifying process and the area specified in the second area specifying process from the storage unit A signal for performing a read path candidate reading process and a signal process corresponding to the read propagation path candidate on the acoustic signal input from the signal input unit, and outputting the processed acoustic signal from the signal output unit Process.

  According to the present invention, it is possible to identify a path of a sound wave that propagates in the space without imposing excessive calculation load on the arithmetic unit, and to output a signal of an acoustic effect such as reflection, diffraction, or localization according to the identified propagation path. The processed voice can be presented in real time.

(Embodiment of the Invention)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The acoustic simulation apparatus according to the present embodiment divides a space having a specific virtual shape (which may be a two-dimensional shape or a three-dimensional shape) into a plurality of regions, and listens from a sound source arranged in the space. It is characterized in that the sound wave propagation path leading up to is prepared in advance as a table stored for each combination of the area where the sound source will be placed and the area where the listening body will be placed.
This device performs generation of a pseudo sound that will be observed when a sound emitted from a specific position in a virtual space as described above is received at another specific position with reference to the table. Thus, the search for the propagation path of the sound wave, which is an essential process for generating the pseudo sound, is speeded up. Thereby, the acoustic effect when the sound emitted from the sound source located at a specific place in the virtual space is observed at another specific place can be simulated in real time.

  FIG. 1 is a block diagram showing a hardware configuration of an acoustic simulation apparatus according to an embodiment of the present invention. As shown in the figure, this apparatus includes a condition input unit 11, a condition storage unit 12, a table storage unit 13, a propagation path calculation unit 14, a signal input unit 15, a signal processing unit 16, a signal output unit 17, and a signal presentation. A portion 18 is provided.

The condition input unit 11 inputs various conditions necessary for the simulation of the acoustic effect. Specifically, identification information indicating a virtual shape space for simulating an acoustic effect, each position where the sound source and the listening body are arranged in the space, and their directions are input. The position where the sound source and the hearing object are arranged is specified by the X coordinate and the Y coordinate if the selected space is a two-dimensional shape, and by the X coordinate, the Y coordinate, and the Z coordinate if the shape is a three-dimensional shape. Specify each.
The condition storage unit 12 is a volatile storage element that temporarily stores the content input from the condition input unit 11.

  The table storage unit 13 is a nonvolatile storage element, and stores each propagation path table prepared according to several types of virtual spaces having different shapes. Each of the tables stored in the storage unit includes each region in the case where the region where the sound source is arranged and the region where the listening body is arranged are selected from the respective regions obtained by dividing the virtual shape space. It consists of a plurality of cells associated with the combination. In addition, route candidate information is stored in each cell constituting the table. The route candidate information is information indicating one or a plurality of sound wave propagation path candidates assumed when the sound wave emitted by the sound source is received by the listener.

When generating a pseudo sound that simulates an acoustic effect, a process of specifying a propagation path of a sound wave from a sound source to a listener must be inevitably executed. In order to reproduce a realistic pseudo sound, if the sound wave is diffracted through some obstacle without directly propagating from the sound source to the listener, the arrival time of the acoustic signal is delayed according to the diffraction path. It is necessary, and the sound wave emitted from the sound source passes through one or more lines constituting the shape of the space (a surface in the case of a three-dimensional shape corresponding to a wall in a virtual space). This is because the reflected sound signal needs to be superimposed on the acoustic signal if it can be propagated.
However, since it is possible to assume an infinite number of sound wave propagation paths from a sound source at an arbitrary position in space to a hearing object at another arbitrary position, one calculation is performed to determine whether or not the sound wave can propagate through these paths. One thing to verify is extremely inefficient.
Therefore, in the present embodiment, the space of the virtual shape is divided into a plurality of regions, and the propagation path of the sound wave between the sound source and the listener that is assumed to have various positional relationships in the space is determined. Prepare a propagation path table that is calculated separately for each positional relationship and the information obtained in the calculation process is grouped for each combination of the area where the sound source is located and the area where the listener is located, and then stored. It was to be. When simulating the acoustic effect, the amount of calculation until the path is determined is reduced by searching for the propagation path by using the contents of the table.

The organization of the cells constituting each propagation path table and the acquisition of path candidate information to be written in each cell are all performed by human work. Specifically, one propagation path table is created according to the procedure shown in FIG.
First, the table creator determines the shape of a virtual space for simulating the acoustic effect (S110). For example, it is assumed that a two-dimensional shape as shown in FIG. In this space, a line segment j having one end in contact with the line segment f and a line segment k in contact with the line segment h are arranged in a rectangle surrounded by the line segments f to i. Formed. When the shape of the space is determined, this space is divided into a plurality of regions (S120), and an ID for identifying each of the divided regions is assigned to a region where a sound source or a listener can exist (S120). S130). The number of regions into which the space is divided and where the boundaries between the regions are set are left to the discretion of each creator, but at least a line that can shield sound waves within the space having the shape (three-dimensional It is desirable to divide the surface so that it overlaps the boundary of the region. For example, the two-dimensional shape shown in FIG. 3A is desirably divided into at least six regions A to F as shown in FIG.

  When the division is finished, this time, a table composed of a plurality of cells corresponding to each combination of areas when the area where the sound source is arranged and the area where the listening body is arranged is selected from each divided area is created. Each path candidate information obtained by the calculation is written in each cell (S140). Finally, the propagation path table completed by writing the route candidate information in all cells is stored in the table storage unit 13 (S150).

The creation work of route candidate information to be stored in the table and the cell will be described in further detail. In the present embodiment, four tables are created as a set for one space whose shape is determined. The four tables are a table storing path candidate information indicating a direct wave path, a table storing path candidate information of a diffraction path not including reflection, a table storing path candidate information of a reflection path not considering diffraction, And a table storing path candidate information of paths including reflection and diffraction.
Here, the former two of these tables have a one-to-one correspondence between each combination of the area where the sound source is arranged and the area where the listening body is arranged and the cell to be referred to, as shown in FIG. On the other hand, the latter two are composed of subdivided cells as shown in FIG. 5, and each line (which can be a three-dimensional shape) that can first reflect the sound wave emitted from the sound source arranged in each region. And the cells to be referenced are associated one-to-one. That is, in the case of the latter two tables, not only the area where the sound source and the listener are arranged is specified, but also the line (or surface) from which the reflected wave connecting the sound source and the listener will be reflected first. For the first time, the cell to be referred to is uniquely identified.
Here, specific description contents of the propagation path information to be recorded in each cell of the four tables described above will be described in order. In the following description, among the areas obtained by dividing the space, the area in which the sound source is arranged is called a sound source area, and the area in which the listening body is arranged is called a listening body area.

<Table storing route candidate information indicating direct wave route>
The contents of the route candidate information recorded in each cell of this table are as follows.
If a sound wave is placed at any position in the sound source area and a direct wave is shielded regardless of the position in the listener area, the cell corresponding to the combination of such areas , Route candidate information having a content meaning “always occluded” is recorded. With such a description, without calculating whether or not the line connecting the sound source and the hearing object and each line forming the virtual shape (a surface in the case of a three-dimensional shape) intersect, It can be determined that there cannot be a path through which the sound wave is directly propagated.
On the other hand, if the wave is not shielded no matter where the sound source is placed in the sound source region and the listener is placed in any position in the listener region, the combination of such regions In the corresponding cell, route candidate information having a content meaning “no possibility of occlusion” is recorded.
On the other hand, when there is a possibility of being blocked depending on the relationship between the position of the sound source in the sound source region and the position of the listener in the listener region, route candidate information indicating the number of a line (or surface) that may cause the shielding Is recorded. If such a description is made, the shape of the space can be determined only by calculating whether or not the line segment connecting the sound source and the listener and the line (or surface) described as the route candidate information intersect. The presence or absence of direct wave shielding can be determined without calculating all of whether or not it intersects with other lines (or planes) that are configured.

<Table storing diffraction path candidate information not including reflection>
The contents of the route candidate information recorded in each cell of this table are as follows.
If the sound source is arranged at any position in the sound source region, and there is no path through which the sound wave is diffracted regardless of the position in the listener region, the cell corresponding to the combination of such regions is Route candidate information with the content meaning “no possibility of being diffracted” is recorded.
On the other hand, if the sound wave is diffracted at a specific diffraction point (a line if it is a three-dimensional shape) no matter where the sound source is placed in the sound source region and the listener is placed in any position in the listener region, Route candidate information indicating the number of a point (or line) that causes diffraction is recorded.
Further, when the signal is diffracted at a plurality of points (or lines) and then propagated to the listening point, route candidate information indicating the number of each point (or line) and the diffraction order is recorded. By making such a description, it is possible to determine a diffraction path without verifying countless paths that can be assumed by calculation.
In addition, although it may be diffracted, if a plurality of diffraction paths can be assumed according to the positional relationship between the sound source and the listener, the path candidate information indicating those diffraction points or lines and the diffraction order by an expression that leaves ambiguity Record. If such a description is given, the route can be determined without repeating duplicated calculations by partially using the calculation result obtained in the process of evaluating one route for the evaluation of another route. . For example, if the route candidate information is recorded with an expression that leaves an ambiguity meaning "diffracted first at point S and then diffracted at either point M or point L", " There are two possible routes: “Point S → Point M → Hearing object” and “Sound source → Point S → Point L → Hearing object”. Candidate whether or not to propagate the former route is determined. Since the calculation of whether or not the diffraction is performed at the point S is performed once, the latter path (point S → point L → listener) can be propagated when verifying the latter path. What is necessary is just to obtain | require by calculation.

<Table storing path candidate information of reflection path not considering diffraction>
The route candidate information recorded in each cell of this table is as follows.
As described above, each cell constituting this table is associated one-to-one with each line (surface in the case of a three-dimensional shape) that can first reflect the sound wave emitted from the sound source. If a reflected wave that passes through a certain line (or surface) is necessarily shielded before being propagated to the listener, the cell corresponding to such a line (or surface) must be “shielded”. Route candidate information having a meaning is recorded.
On the other hand, if a reflected wave passing through a certain line (or surface) cannot be shielded, the cell corresponding to such a line (or surface) has a “possibility to be shielded”. Route candidate information with a content meaning “no” is recorded.
When a reflected wave passing through a certain line (or surface) may be shielded, route candidate information indicating the number of another line (or surface) that can cause the shielding is recorded. If such a description is made, the shape of the space can be configured only by calculating whether or not the reflected wave is shielded due to the line (or surface) described as the route candidate information. Even if it is not calculated whether or not the reflected wave is shielded due to the line (or surface), it can be determined whether or not the reflected wave is shielded.

<Table storing route candidate information for routes including reflection and diffraction>
The route candidate information recorded in each cell of this table is as follows.
Each cell constituting this table is also associated one-to-one with a line or surface that can reflect the sound wave emitted from the sound source. If a reflected wave passing through a certain line (or a surface in the case of a three-dimensional shape) cannot be diffracted, the cell corresponding to such a line (or surface) will be “diffractable. The route candidate information having the meaning of “no sex” is recorded.
In addition, the reflected wave that passes through a certain line (or surface) may be diffracted, but if multiple diffracted paths can be assumed depending on the position of the sound source and the listener, it corresponds to such a line (or surface). In the cell, the path candidate information indicating the diffraction points or lines and the diffraction order is recorded by an expression that leaves ambiguity. If such a description is given, the calculation result obtained in the process of evaluating one reflection path is partially used in the evaluation of another reflection path, so that the path can be determined without repeating duplicate calculations. Can do.

Returning to the description of each part shown in FIG.
The propagation path calculation unit 14 specifies a cell to be referred to from among the cells of the propagation path table, and evaluates the route candidate information stored in the cell based on the input content from the condition input unit 11, thereby generating a sound source. The propagation path of the sound wave from to the listener is determined. The signal input unit 15 inputs an acoustic signal indicating a sound assumed to be emitted from a sound source. The signal processing unit 16 performs signal processing corresponding to the contents of the propagation path calculated by the propagation path calculation unit 14 on the acoustic signal input from the signal input unit 15. The signal output unit 17 outputs the acoustic signal that has been subjected to signal processing by the signal processing unit 16. The signal presentation unit 18 presents a pseudo sound by causing the plurality of speakers to pronounce the signal output from the signal output unit 17.

Subsequently, the operation of the embodiment will be described. The operation of this embodiment is divided into simulation processing and signal processing.
FIG. 6 is a flowchart showing the simulation process.
When this process is started, first, in step 210, various conditions necessary for simulating the acoustic effect are input from the condition input unit 11. When a condition is input, the process proceeds to step 220 and the condition is stored in the condition storage unit 12. Subsequently, sound source position information indicating the position of the sound source is acquired from the condition storage unit 12 (S230), and listener position information indicating the position of the listener is acquired (S240). Thereafter, in step 250, it is determined in which region included in the virtual shape space the sound source is located, and in subsequent step 260, it is determined in which region the hearing object is located.

Next, a cell corresponding to the combination of the two areas specified by the above determination is referred to among the cells constituting the propagation path table (S270). Here, as described above, the table storage unit 13 stores a set of four propagation path tables having different contents. In this process, first, path candidate information indicating a direct wave path is stored. A cell in the table is referenced. Subsequently, the process proceeds to step 280, where the route candidate information stored in the referenced cell is read and the contents thereof are evaluated.
As described above, in the propagation path table, there are lines that can cause diffraction and shielding, contents indicating surface numbers, and path candidates with contents that mean “always shielded” or “not likely to be shielded”. Information is stored. Therefore, for example, when the line or surface number that may cause diffraction or shielding is shown, the line segment connecting the coordinates where the sound source is located and the coordinates where the listening body is located, and the path candidate information By calculating whether or not a line or surface intersects, it is evaluated whether or not the path is actually propagated. On the other hand, if it is a content that means “be sure to be shielded”, it is clear that such a route cannot be propagated, and the process immediately proceeds to the next step.

Here, as described above, the propagation route table may describe route candidate information indicating a plurality of routes by an expression that leaves ambiguity. If such route candidate information is described, the process returns to step 280 and the process is repeated, whereby all candidates assumed by such an ambiguous expression are individually evaluated. In the second and subsequent evaluations, it is possible to partially use the calculation results obtained in the evaluation process that has already been performed.
When the route is determined by evaluating all the route candidates, this time, the propagation route table to be referred to is changed to another one, and the processing after step 270 is executed. However, among the four tables described above, the table storing the path candidate information of the reflection path not considering diffraction and the table storing the path candidate information of the path including reflection and diffraction are radiated from the sound source arranged in each region. In order to refer to these tables, each line (surface in the case of a three-dimensional shape) and each cell, which can reflect the sound wave to be reflected, are organized in a one-to-one correspondence. First, the line (or surface) that will reflect the sound wave first is set from the relationship between the position and the line that forms the shape of the space (or the surface if it is a three-dimensional shape), and the set line (or surface) is indexed. The cell to be referred to is uniquely specified.
By repeating the above processing for the four tables, the direct wave propagation path, the diffracted wave propagation path, and the reflected wave propagation path are all determined.
When all the propagation paths are confirmed, the result of the confirmed propagation path is set in the signal processing unit 16 (S290). When the condition is input again from the condition input unit 11, the processing as described above is executed.

FIG. 7 is a flowchart showing signal processing.
This process is started when an acoustic signal is input from the signal input unit 15 in a state where the propagation path determined according to the simulation process described above is set in the signal processing unit 16.
In step 310, when an acoustic signal is input, the signal processing unit 16 performs signal processing on the acoustic signal according to the set propagation path (S320). Specifically, a predetermined coefficient necessary for applying a sound effect such as reverberation or sound field according to the determined path, and further sound localization such as sound localization is read from a memory (not shown) and inputted. Various signal processing such as filter processing, delay processing, and convolution processing are performed by applying these coefficients to. Subsequently, the process proceeds to step 330, and the signal processing unit 16 outputs the acoustic signal subjected to the signal processing to the signal presentation unit 18. Thereby, from the signal presentation part 18, the pseudo sound localized according to the content of the acoustic signal is emitted.

  As described above, in the present embodiment, one or a plurality of sound wave propagation paths from the sound source to the listener when the sound source and the listener are arranged in a space having a plurality of virtually divided regions. , A table recorded for each combination of areas where the sound source and the listening object are arranged is prepared, and after specifying the cell in the table using the position information of the sound source and the listening object input from the condition input unit 11 as a key, The propagation path of the sound wave between the sound source and the listener can be determined simply by evaluating which of the several paths defined in the cell propagates the sound wave. In this way, by referring to the table, the number of possible acoustic wave propagation paths is narrowed down in several ways, and each narrowed propagation path is individually evaluated by calculation to determine the path. Therefore, a sound wave transmission path can be efficiently searched with a relatively small amount of calculation.

  The path candidate information to be stored in each cell of the propagation path table includes, for example, a plurality of paths such as “first diffracted at point S and then diffracted at either point M or point L”. Can be described in an ambiguous expression such that candidates are combined into one. By describing in such an ambiguous expression, the size of data recorded in the table can be reduced. In addition, by repeatedly using the calculation result obtained in the process of evaluating one route for evaluation of the other route, repeated calculation can be omitted.

(Other embodiments)
The present invention can be modified in various ways.
In the above embodiment, the organization of the cells constituting each propagation path table and the writing of the route candidate information to be written in each cell are all performed manually. On the other hand, after determining the shape of the virtual space, the step of dividing the shape into a plurality of regions may be automated according to a predetermined algorithm. When introducing such automation, it is more preferable to perform space division according to a BSP (Binary Space Partitioning) tree algorithm. This BSP tree algorithm means an algorithm that recursively divides a space into two parts, and finally repeats the division until there is one object in each divided area. By dividing the virtual shape space according to such an algorithm, a plurality of generally optimized regions can be efficiently obtained.

The organization of the propagation path table stored in the table storage unit 13 is merely an example. Therefore, it may be created by other suitable knitting. For example, in the above-described embodiment, a table storing path candidate information indicating a direct wave path, a table storing path candidate information of a diffraction path not including reflection, and path candidate information of a reflection path not considering diffraction are stored. The table storing the path candidate information of the path including the reflection and diffraction is stored in the table storage unit 13 as one set, but the table storing the path candidate information of the diffraction path not including the reflection is stored. In addition, the path candidate information when diffraction is not taken into account, that is, the path candidate information for supporting the determination of the direct wave path such as “always occluded” or “no possibility of occlusion” is recorded. This eliminates the need to separately provide a table storing route candidate information indicating the direct wave route. Similarly, if the path candidate information of the path including the reflected wave and the diffraction is stored in the table including the path candidate information of the reflection path when the diffraction is not considered, the path of the reflection path not considering the diffraction is stored. There is no need to separately provide a table storing candidate information.
Of the four tables described above, the table storing the path candidate information of the reflection path not considering diffraction and the table storing the path candidate information of the path including reflection and diffraction are radiated from the sound source arranged in each area. Each line (surface in the case of a three-dimensional shape) that can first reflect the sound wave to be generated is associated with each cell to be referred to in a one-to-one correspondence. On the other hand, when the path of the second-order reflected and third-order reflected sound waves can be obtained in advance by individual calculation until it can be shielded or diffracted, the line (or surface) that is sequentially passed through each such reflected path. ) And the order of passage thereof, and the cells to be referred to may be organized in a one-to-one correspondence. Thereby, since the contents of the route candidate information to be stored in each cell can be made more strict, it can be expected that the reflection route is uniquely determined with a smaller amount of calculation.
The condition input unit 11 described above may be configured by a first joystick that instructs the position of the sound source and a second joystick that instructs the position of the listener. With such a configuration, the positions of the sound source and the listening body can be freely changed by an extremely simple operation.

Further, in the propagation route table of the above embodiment, those in which the region where the sound source is arranged and the region where the hearing object is arranged are handled as different combinations, and individual route candidate information is stored in the corresponding cells. However, since the propagation path when the positions of the sound source and the listener are reversed can be easily inferred from the result before the reversal, one of the tables may be omitted. With this configuration, the burden of creating a propagation path table can be reduced, and the data amount of the entire table can be reduced.
In the above embodiment, the sound source and the listener are literally handled as “points”. However, when the sound source and the listener have a certain size, by treating them as pseudo points, You may make it simulate an effect. Further, the sound source and the listening body may be handled as having directivity, and after obtaining the propagation path, the propagation path may be given a predetermined weight according to the direction of the sound source and the listening body.

The acoustic simulation apparatus according to the embodiment includes a signal input unit 15 and performs signal processing according to a virtual propagation path on an acoustic signal input from the outside via the input unit. However, standard acoustic signal data may be stored in advance in a memory, and signal processing may be performed on the acoustic signal read from the memory. Conceptually showing the configuration and operation of such a modification, “in a space having a plurality of virtually divided regions, assuming a plurality of arrangements of sound sources and listening bodies in the space, For each combination of a region to be arranged and a region in which the hearing object is arranged, one or a plurality of sound wave propagation path candidates from the sound source to the hearing object are stored, and signal data indicating an acoustic signal is stored A storage unit; a position input unit that inputs sound source position information indicating a position of the sound source; and a listener position information indicating a position of the listener; and a first region that specifies a region where the sound source is located based on the sound source position information. A region specifying unit, a second region specifying unit for specifying a region where the listener is located based on the listener position information, a region specified by the first region specifying unit, and the second region specifying Corresponds to the combination with the area specified by the part A path candidate reading unit that reads the attached propagation path candidate, an acoustic signal reading unit that reads signal data from the storage unit, and a signal process corresponding to the read propagation path candidate is performed on the acoustic signal indicated by the signal data An acoustic simulation apparatus including a signal processing unit and a signal output unit that outputs an acoustic signal subjected to signal processing by the signal processing unit.
Further, a program that performs the same operation as each unit described in the above embodiment may be mounted on a known computer device and used as an acoustic simulation device.

It is a block diagram which shows the hardware constitutions of embodiment. It is a flowchart which shows the preparation procedure of a propagation path table. It is a figure which shows a virtual two-dimensional shape and its division example. It is a figure which shows the organization of a virtual route table. It is a figure which shows the organization of a virtual route table. It is a flowchart which shows a simulation process. It is a flowchart which shows a signal processing. It is a figure which shows a virtual shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Condition input part, 12 ... Condition memory | storage part, 13 ... Table memory | storage part, 14 ... Propagation path | route calculation part, 15 ... Signal input part, 16 ... Signal processing part, 17 ... Signal output part, 18 ... Signal presentation part

Claims (3)

For each combination of a region where the sound source is arranged and a region where the listening body is arranged, assuming a plurality of arrangements of the sound source and the listening body in the space in a space having a plurality of virtually divided regions. A storage unit for storing one or a plurality of sound wave propagation path candidates from the sound source to the listener;
A signal input unit for inputting an acoustic signal;
A position input unit for inputting sound source position information indicating the position of the sound source and listener position information indicating the position of the listener;
Based on the sound source position information, a first region specifying unit that specifies a region where the sound source is located,
A second region specifying unit for specifying a region where the listener is located based on the listener position information;
A path candidate reading unit that reads out a propagation path candidate associated with a combination of the area specified by the first area specifying unit and the area specified by the second area specifying unit from the storage unit;
A signal processing unit that performs signal processing corresponding to the read propagation path candidate on the acoustic signal input from the signal input unit;
An acoustic simulation apparatus comprising: a signal output unit that outputs an acoustic signal subjected to signal processing by the signal processing unit. For each combination of a region where the sound source is arranged and a region where the listening body is arranged, assuming a plurality of arrangements of the sound source and the listening body in the space in a space having a plurality of virtually divided regions. A storage unit for storing one or a plurality of sound wave propagation path candidates from the sound source to the listener;
A signal input unit for inputting an acoustic signal;
A position input unit for inputting sound source position information indicating the position of the sound source and listener position information indicating the position of the listener;
Based on the sound source position information, a first region specifying unit that specifies a region where the sound source is located,
A second region specifying unit for specifying a region where the listener is located based on the listener position information;
A path candidate reading unit that reads out a propagation path candidate associated with a combination of the area specified by the first area specifying unit and the area specified by the second area specifying unit from the storage unit;
By evaluating the read propagation path candidate based on the positional relationship between the sound source and the listener, a path determination unit that determines a sound wave propagation path from the sound source to the listener;
A signal processing unit that performs signal processing according to the determined propagation path on the acoustic signal input from the signal input unit;
An acoustic simulation apparatus comprising: a signal output unit that outputs an acoustic signal subjected to signal processing by the signal processing unit. For each combination of a region where the sound source is arranged and a region where the listening body is arranged, assuming a plurality of arrangements of the sound source and the listening body in the space in a space having a plurality of virtually divided regions. A storage unit for storing one or a plurality of sound wave propagation path candidates from the sound source to the listener;
A signal input unit for inputting an acoustic signal;
A position input unit for inputting sound source position information indicating the position of the sound source and listener position information indicating the position of the listener;
A computer device having a signal output unit for outputting an acoustic signal,
Based on the sound source position information input from the position input unit, a first region specifying process for specifying a region where the sound source is located;
A second region specifying process for specifying a region where the listener is located, based on the listener position information input from the position input unit;
A path candidate reading process for reading out a propagation path candidate associated with a combination of the area specified in the first area specifying process and the area specified in the second area specifying process from the storage unit;
A program that performs signal processing on the acoustic signal input from the signal input unit, and outputs the acoustic signal that has been subjected to the signal processing from the signal output unit.

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