JP2010041190A - Acoustic device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for performing localizing setting of a sound image using a plurality of speakers more simply as compared with the conventional art, in a space, such as a theater and a hall. <P>SOLUTION: Respective pronunciation positions of a plurality of speakers SP and the position of a virtual sound source are input to the acoustic device 1. The acoustic device 1 calculates the input respective positions of respective speakers SP and respective distances to the position of virtual sound source, converts ratios of the respective distances to the sum of the respective calculated distances by a monotonically decreasing function, and calculates a sound pressure level at the respective speaker positions in accordance with the result of conversion. Then, the acoustic device 1 sets a sound voltage parameter so that a sound pressure corresponds to the calculated sound pressure level with respect to a signal processing circuit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for localizing or moving a sound image.

  In facilities such as theaters and halls, a method has been proposed in which various sounds such as performers' voices and performance sounds are localized using a plurality of speakers (see Non-Patent Documents 1 to 4). For example, Non-Patent Document 1 proposes a method for setting the localization with two speakers. As a method of setting the localization with three speakers, assuming a triangular shape with the speaker position as the apex, the weight of each apex (sound pressure / level) so that the position of the physical center of gravity is physically set A method for calculating the value has been proposed.

On the other hand, when sound image localization is performed using four or more speakers, the solution is not uniquely obtained even if the position of each speaker is obtained by the above-described method (using three speakers), and the solution is a duplicate solution. There is a case. Therefore, in Non-Patent Document 2, a plurality of virtual speaker positions and the like are arranged to create a triangular mesh, and the weight of each vertex for localization creation is obtained by obtaining the center of gravity with the triangle including the position at each localization position ( Level) is proposed.
“Http://www.shonan.ne.jp/~hiro-s/pages/MSP2_Doc/tutorial_22.html” “LCS: http: //www.meyersound.com/products/lcs_series/matrix3/surround_panning.htm” “Http://www.acoustics.hut.fi/research/cat/vbap/” “Audio Engineering Society Convention Paper Presented at the 117th Convention 2004 October 28-31 San Francisco, CA, USA”

  However, in the technique described in Non-Patent Document 2, it is necessary for an operator such as a sound designer to manually design what kind of plural speakers are arranged at which position. There is a need to do. Further, the technique described in Non-Patent Document 2 requires dedicated hardware and software, and there is a problem that the system becomes large and the cost becomes high. In addition, the apparatuses described in Non-Patent Documents 1 to 4 have a problem that the calculation scale is large and the apparatus configuration becomes complicated, and the processing time becomes long.

  The present invention has been made in view of the above-described circumstances, and in a space such as a theater or a hall, setting of localization or movement of a sound image using a plurality of speakers is performed with a simpler operation than in the past. It aims at providing the technology that can do.

  In order to solve the above-described problem, an acoustic device according to a preferred aspect of the present invention includes speaker position input means for inputting the position of each of a plurality of speakers, virtual sound source position input means for inputting the position of a virtual sound source, Distance calculation means for obtaining respective distances between the positions of the speakers input by the speaker position input means and the positions of the virtual sound sources input by the virtual sound source position input means, and the distances calculated by the distance calculation means The ratio of each distance to the sum of the above is converted by a monotonically decreasing function, sound pressure level calculating means for calculating the sound pressure level at each speaker position according to the conversion result, and a plurality of audio signals supplied to each speaker A signal processing circuit, and the signal processing circuit is connected to each speaker so as to have a sound pressure corresponding to the sound pressure level calculated by the sound pressure level calculating means. Characterized by comprising a sound pressure parameter setting means for setting a Ruoto圧 parameters.

  In the above aspect, the sound pressure level calculation means calculates the reciprocal of the ratio of each distance to the total of the distances calculated by the distance calculation means, and calculates the sound pressure level at each speaker position according to the calculation result. May be.

  Further, in the above aspect, the sound pressure level calculation unit calculates a reciprocal of a power of a ratio of each distance with respect to a total of each distance calculated by the distance calculation unit, and the sound at each speaker position according to the calculation result. The pressure level may be calculated.

  Further, in the above-described aspect, the ratio of each distance to the total distance calculated by the distance calculating unit is converted by a monotonically decreasing function of a plurality of different algorithms, and the sound pressure at each speaker position is converted according to the conversion result. A plurality of sound pressure level calculating means for calculating a level; and a selecting means for selecting at least one of the plurality of sound pressure level calculating means, wherein the sound pressure level calculating means comprises the selecting means. The sound pressure level may be calculated using the sound pressure level calculation means selected by the above.

  In the above-described aspect, the selection unit may select at least one of the plurality of sound pressure level calculation units according to an operation signal supplied from an operation unit operated by an operator. .

  Further, in the above aspect, the selecting means is at least one of the plurality of sound pressure level calculating means based on at least one of the position of each of the plurality of speakers and the position of the virtual sound source. May be selected.

  Further, in the above aspect, the virtual sound source position input unit inputs time and a position of the virtual sound source in association with each other, and the distance calculation unit includes the position of each speaker and the position of the speaker as time elapses. Each distance from the position of the virtual sound source corresponding to the time is calculated in time series, and the sound pressure level calculation means calculates the distance of each distance calculated by the distance calculation means according to the calculation result of the distance calculation means. The ratio of each distance to the total may be converted by a monotonously decreasing function, and the sound pressure level at each speaker position may be calculated in time series according to the conversion result.

  In the above aspect, the virtual sound source position input unit inputs a locus of the virtual sound source, and the distance calculation unit determines the position of each speaker and the locus of the virtual sound source according to the input locus. The sound pressure level calculation means converts the ratio of each distance to the total distance calculated by the distance calculation means by a monotonically decreasing function according to the calculation result of the distance calculation means. Then, the sound pressure level at each speaker position may be calculated according to the conversion result.

  Further, in the above-described aspect, the sound pressure level calculation unit may calculate a distance between the position of each speaker calculated by the distance calculation unit and the position of the virtual sound source among the plurality of speakers. The sound pressure level at each speaker position may be calculated for speakers that are smaller than a predetermined threshold.

  Further, in the above-described aspect, a storage unit that stores directivity data indicating the directivity content of each of the plurality of speakers is provided, and the sound pressure level calculation unit is configured to store each distance calculated by the distance calculation unit. The ratio of each distance to the total is converted by a monotonically decreasing function, the conversion result is multiplied by a coefficient based on the directivity data of each of the plurality of speakers stored in the storage unit, and the multiplication result is multiplied. Accordingly, the sound pressure level at each speaker position may be calculated.

  According to the present invention, in a space such as a theater or a hall, the setting of localization or movement of a sound image using a plurality of speakers can be performed with a simpler calculation than in the past.

Embodiments of the present invention will be described below with reference to the drawings.
<A: Configuration>
FIG. 1 is a block diagram showing a configuration of an acoustic device 1 according to an embodiment of the present invention. The acoustic device 1 is a device for localizing a sound image by moving sound pressure levels of a plurality of speakers in a space such as a theater or a hall, or moving the position of the localized sound image. By moving the position where the sound device 1 has localized the sound image in the space, the listener can feel as if the sound source is moving in the space. In the following description, a sound source that is virtually located at a position where a sound image is localized by sound emission from a plurality of speakers will be referred to as a “virtual sound source”. Although the present invention can be applied to two or more speakers, this embodiment will be described assuming that the number of speakers is four.

  In the figure, an operation unit 11 includes, for example, a keyboard and a mouse, and outputs a signal according to an operation by an operator such as a stage director to the audio device 1. The operator can input various types of information such as the positions of a plurality of speakers and the position of a desired virtual sound source by operating the operation unit 11. This input may be performed by, for example, the operator placing a speaker or a virtual sound source by performing a drag-and-drop operation using a mouse, or, for example, using a numeric keypad or the like of a keyboard. You may make it input the numerical value of the coordinate of a virtual sound source directly. The speaker coordinate input unit 12 inputs the coordinates (sound generation position) of the speaker actually placed in a space such as a theater or a hall to the output gain calculation unit 16 in accordance with a signal supplied from the operation unit 11. The virtual sound source coordinate input unit 13 inputs the position of the virtual sound source desired by the operator to the output gain calculation unit 16 according to the signal supplied from the operation unit 11. The sound source input unit 14 inputs audio signals to be emitted from the virtual sound source to the power amplifiers 18-1, 18-2,..., 18-n. The sound source input unit 14 may read out an audio signal stored in, for example, a predetermined storage device or storage medium (CD or the like) and input the audio signal to the power amplifiers 18-1, 18-2, ..., 18-n. For example, an audio signal received from a predetermined device via a communication network may be input to the power amplifiers 18-1, 18-2,.

  The output gain calculation unit 16 calculates the output gain of each speaker based on the positions of the plurality of speakers set in the space and the position of the virtual sound source. Here, the output gain calculation unit 16 first calculates each distance between the positions of the plurality of speakers input from the speaker coordinate input unit 12 and the positions of the virtual sound source input from the virtual sound source coordinate input unit 13. calculate. Next, the output gain calculation unit 16 converts the ratio of each distance to the total of the calculated distances by a monotonic decreasing function, and weights each speaker necessary for generating a virtual sound source at a predetermined position according to the conversion result. A coefficient (a ratio indicating a relative relationship between sound pressure levels to be reproduced by each speaker) is calculated. Since this calculation process will be described later, detailed description thereof is omitted here. When the weighting coefficient for each speaker is calculated, the output gain calculating section 16 receives the sound receiving point while maintaining the relative relationship of the calculated weighting coefficients with respect to the power amplifiers 18-1, 18-2,. The amplifier gain necessary for obtaining a predetermined sound pressure level in (sound receiving area) is calculated, and the calculated amplifier gain is supplied to the power amplifiers 18-1, 18-2,.

  The power amplifiers 18-1, 18-2,..., 18-n are a plurality of signal processing circuits that supply audio signals to the plurality of speakers SP-1, SP-2,. The power amplifiers 18-1, 18-2,..., 18-n amplify the audio signal input from the sound source input unit 14 based on the sound pressure parameter supplied from the output gain calculation unit 16. In the following description, when it is not necessary to distinguish the power amplifiers 18-1, 18-2,..., 18 -n for convenience of explanation, these will be referred to as “power amplifier 18”.

  Speakers SP-1, SP-2,..., SP-n are sound emitting means for emitting sound based on the sound signal supplied from the power amplifier 18. In the following description, for convenience of description, when it is not necessary to distinguish the speakers SP-1, SP-2,..., SP-n, these will be referred to as “speakers SP”. A plurality of speakers SP are provided in the space, and a virtual sound source is realized by localization of sound images emitted from these speakers SP. Here, the speaker SP is assumed to be omnidirectional.

Next, the content of the output gain calculation process performed by the output gain calculation unit 16 will be described. Here, a case where sound image localization is performed using four speakers SP-1, SP-2, SP-3, and SP-4 will be described. From the speaker coordinate input unit 12, coordinates of a plurality of speakers are input. Here, the following x and y coordinates are input as the coordinates sp ₁ , sp ₂ , sp ₃ , and sp ₄ of the _four speakers SP-1, SP-2, SP-3, and SP-4 from the speaker coordinate input unit 12. Is done.
sp ₁ = (x ₁ , y ₁ ),
sp ₂ = (x ₂ , y ₂ ),
sp ₃ = (x ₃ , y ₃ ),
sp ₄ = (x ₄ , y ₄ )

Further, the following coordinates ps are input from the virtual sound source coordinate input unit 13 as the coordinates of the virtual sound source.
ps = (x _ps , y _ps )

First, the output gain calculation unit 16 obtains each distance between the position of each speaker input from the speaker coordinate input unit 12 and the position of the virtual sound source input from the virtual sound source coordinate input unit 13. Here, the output gain calculation unit 16 calculates the distances D ₁ , D ₂ , D ₃ , and D ₄ between the speakers SP-1, SP-2, SP-3, and SP-4 and the virtual sound source as follows: It calculates using (1)-(4) Formula.

Next, the output gain calculation unit 16 calculates the total of the calculated distances. Here, the output gain calculation unit 16 calculates the sum D _sum of D ₁ to D ₄ by the equation (5).
D _sum = (D ₁ + D ₂ + D ₃ + D ₄ ) (5)

Next, the output gain calculation unit 16 converts the ratio of each distance with respect to the total of the calculated distances using a monotone decreasing function, and calculates the sound pressure level at each speaker position according to the conversion result. Here, the output gain calculation unit 16 calculates how much the distance from the virtual sound source to each speaker SP is with respect to the total total distance, and uses the reciprocal as a weighting coefficient for each speaker. Specifically, the output gain calculation unit 16 calculates the reciprocals R ₁ , R ₂ , R ₃ , R ₄ of the ratios of the distances D ₁ , D ₂ , D ₃ , D _{4 to} the total distance D _sum for each speaker. As a weighting coefficient with respect to, it is calculated by equations (6) to (9).
R ₁ = (D ₁ / D _sum ) ^-1 (6)
R ₂ = (D ₂ / D _sum ) ^-1 (7)
R ₃ = (D ₃ / D _sum ) ^-1 (8)
R ₄ = (D ₄ / D _sum ) ^-1 (9)

The output gain calculation unit 16 supplies the power amplifier 18 with sound pressure parameters p1, p2, p3, and p4 that provide sound pressures corresponding to the calculated sound pressure levels R ₁ , R ₂ , R ₃ , and R _4. . The power amplifier 18 adjusts the sound pressure level of the audio signal supplied from the sound source input unit 14 according to the supplied sound pressure parameter, and outputs it to the speaker SP. Thereby, the sound of the sound pressure level adjusted according to each sound pressure parameter is emitted from the speaker SP, and the virtual sound source is located at a position corresponding to the sound pressure level of the sound emitted from each speaker SP. Is realized.

<B: Operation>
Next, the operation of this embodiment will be described. First, an operator such as a stage director operates the operation unit 11 to input coordinates indicating the position of each speaker SP and input coordinates indicating the position of a desired virtual sound source. The operation unit 11 outputs a signal corresponding to the operated content. The speaker coordinate input unit 12 inputs the coordinates of each speaker SP to the output gain calculation unit 16 in accordance with a signal from the operation unit 11. Further, the virtual sound source speaker 13 inputs the coordinates of the virtual sound source to the output gain calculation unit 16 in accordance with the operation signal from the operation unit 11. The output gain calculation unit 16 calculates the sound pressure level at each speaker position using the above-described equations (1) to (9) using the coordinates of the input speaker SP and the coordinates of the virtual sound source. When the sound pressure level is calculated, the output gain calculation unit 16 supplies the power amplifier 18 with a sound pressure parameter that provides a sound pressure corresponding to the calculated sound pressure level. The power amplifier 18 amplifies the audio signal based on the sound pressure parameter supplied from the output gain calculation unit 16 and supplies the amplified audio signal to each speaker SP. The speaker SP emits sound according to the supplied audio signal, and a virtual sound source is realized (generated) at a predetermined position by sound image localization of the emitted sound.

  Here, the virtual sound source (hereinafter referred to as “virtual sound source PS ′”) actually realized by the position ps of the virtual sound source (hereinafter referred to as “virtual sound source PS”) desired by the worker and sound emission from the plurality of speakers SP. The relationship with the position (hereinafter referred to as “position ps ′”) will be described with reference to FIGS. 2 and 3 are diagrams showing examples of the coordinates sp1, sp2, sp3, sp4 of the four speakers SP1, SP2, SP3, SP4, the coordinates ps of the virtual sound source PS, and the coordinates ps ′ of the virtual sound source PS ′. In this operation example, the weight (sound pressure level) of the virtual sound source PS is described as “1.0”.

First, the position ps ′ of the virtual sound source PS ′ realized by sound emission from the four speakers SP1, SP2, SP3, SP4 illustrated in FIG. 2 is calculated by the above-described equations (1) to (9) and below. It calculates using each of these formulas. That is, the position ps ′ of the virtual sound source PS ′ actually generated by calculating the center of gravity based on the values of the weighting coefficients R _{1 to} R ₄ for each speaker calculated by the expressions (6) to (9). Then, the calculation result is compared with the initially assumed virtual sound source PS position ps.
First, the sum R _sum of the sound pressure levels of the respective speakers is calculated by the equation (10).
R _sum = (R ₁ + R ₂ + R ₃ + R ₄ )… (10)

Next, a new coordinate is calculated by multiplying the original coordinate by a ratio to the entire weight (= sound level).
_{x 1 '= (R 1 /} R sum) * x 1, y 1' = (R 1 / R sum) * y 1 ... (11)
_{x 2 '= (R 2 /} R sum) * x 2, y 2' = (R 2 / R sum) * y 2 ... (12)
x ₃ '= (R ₃ / R _sum ) * x ₃ , y ₃ ' = (R ₃ / R _sum ) * y ₃ (13)
_{x 4 '= (R 4 /} R sum) * x 4, y 4' = (R 4 / R sum) * y 4 ... (14)

If the sum of these new coordinates is calculated, the coordinates ps ′ of the actual virtual sound source PS ′ are calculated.
x _ps '= (x ₁ ' + x ₂ '+ x ₃ ' + x ₄ '), y _ps ' = (y ₁ '+ y ₂ ' + y ₃ '+ y ₄ ')… (15)

Here, when the position ps ′ of the actual virtual sound source PS ′ is obtained using the above-described equations (1) to (15) using the coordinates of the speaker and the virtual sound source exemplified in FIG.
(X _ps ', y _ps ') = (0.1, 5.3). As shown in FIG. 3, the position ps ′ of the virtual sound source PS ′ to be realized is a position close to the position ps of the virtual sound source PS desired by the operator.

Next, another operation example will be described with reference to FIGS. 4 and 5 are diagrams illustrating other specific examples of the coordinates of the four speakers SP1, SP2, SP3, and SP4 and the coordinates of the virtual sound source PS. When the virtual sound source SP ′ is realized by using these speakers SP1, SP2, SP3, SP4, the position ps ′ of the actual virtual sound source SP ′ is obtained using the above-described equations (1) to (15).
(X _ps ', y _ps ') = (8.0, -8.5).

  As shown in FIGS. 3 and 5, when the sound pressure level is calculated using the equations (1) to (9), the position ps ′ of the virtual sound source PS ′ realized by sound emission from the speaker SP is The position becomes close to the desired position ps of the virtual sound source PS. Originally, unless the weighting coefficient of each speaker is determined, the position of the sound image generated by these plural speakers cannot be calculated. At the same time, there is a conflicting problem that the weighting coefficient of each speaker cannot be uniquely determined with four or more speakers. However, based on this method, based on the assumed sound image position and the distance between each speaker, a sound image position obtained by introducing a weighting coefficient that is converted by a monotonically decreasing function (in this example, the reciprocal 1 / r) Was confirmed to be close to the initially assumed sound image position.

  As described above, according to the present embodiment, the localization setting with a plurality of speakers is performed by the level pan using the distance ratio, so that the localization setting in the theater can be facilitated. In the calculation process according to the present embodiment, although there are some errors, it does not make the listener feel uncomfortable. As described above, in the present embodiment, the sound pressure level of each speaker SP for realizing the virtual sound source at a desired position can be calculated with simple calculation without performing complicated calculation. As a result, the overall calculation time for sound image localization can be shortened, and even if the number of speakers increases, the calculation amount does not increase exponentially.

  Further, the worker only needs to perform an operation of inputting the position of the speaker and the position of the virtual sound source to the audio device 1, and does not need to perform a complicated operation. In particular, according to the present embodiment, it is not necessary to define the number of speakers to be played, and it is not necessary for the user to make such settings.

By the way, when the sound image position to be localized is moved and set to one speaker position, theoretically, only one of the speakers needs to sound. However, considering the listener sitting on the other side of the speaker, the sound that the listener is listening to suddenly stops sounding that the nearby speaker has been sounding at a certain volume until now, Only one speaker will sound. This is very unnatural, and the listener has a sense of incongruity and impairs the sound production effect.
On the other hand, in the present embodiment, the distance between the positions of all the speakers installed in the space and the position of the virtual sound source is calculated, and the weighting coefficient for each speaker according to the ratio of each distance to the total calculated distance Therefore, the sound is emitted from all the speakers using the weighting coefficient calculated by calculating the weighting coefficient for all the speakers. In this way, since the virtual sound source is realized using all the speakers installed in the space, there is no speaker that does not sound. Therefore, a virtual sound source can be realized without causing the listener to feel uncomfortable, and the virtual sound source can be moved.

  Further, in the present embodiment, when sound image localization is made using a plurality of speakers, the level difference is determined using the distance (= 1 / r) between the assumed sound image position and each speaker to be sounded. It is possible to perform localization setting with higher accuracy by simple calculation.

  By the way, in the conventional apparatus, when listening points are set in advance (for example, on the center line of the stereo sound source in Non-Patent Document 1, and in the non-Patent Document 3, the center point is equidistant from a plurality of speakers). When a sound receiving point is set in the vicinity of the speaker, the control is performed such that the localization of the sound image is shifted toward the nearby speaker. On the other hand, according to this embodiment, as described above (paragraph number 0038), since the virtual sound source is realized using all the speakers, the listening position can be set in a wide range including the vicinity of the speakers.

<C: Modification>
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. An example is shown below. In addition, you may combine each following aspect suitably.
(1) In the above-described embodiment, the sound pressure level at each speaker position is calculated by taking the reciprocal of the ratio of the distance between each speaker position and the virtual sound source position. The method for calculating the sound pressure level is not limited to this. For example, the reciprocal of the square of the distance may be calculated as the sound pressure level. Specifically, the output gain calculation unit 16 calculates the sound pressure level using the following equations (16) to (19) instead of the equations (6) to (9) shown in the above embodiment. May be.
R ₁ = (D ₁ / D _sum ) ^-2 (16)
R ₂ = (D ₂ / D _sum ) ^-2 (17)
_{R 3 = (D 3 / D} sum) -2 ... (18)
R ₄ = (D ₄ / D _sum ) ^-2 (19)

  Even when the sound pressure level is calculated using the equations (16) to (19), the position of the virtual sound source PS ′ realized by sound emission from the speaker SP is the desired virtual position, as in the above-described embodiment. It approximates the position of the sound source SP. As described above, even when the sound pressure level is calculated using the reciprocal of the square of the distance, each of the components for realizing the virtual sound source at a desired position without performing a complicated calculation as in the above-described embodiment. The sound pressure level of the speaker SP can be calculated.

  In addition, the method for calculating the sound pressure level is not limited to that described above. For example, the reciprocal of the power of distance (power), the reciprocal of the exponent of distance, or the reciprocal of the logarithm of distance may be used. The output gain calculation unit 16 converts each distance (or a ratio of each distance) between each speaker SP and the desired virtual sound source PS using a monotonously decreasing function, and the sound pressure at each speaker position according to the conversion result. What is necessary is just to calculate a level. That is, if the output gain calculation unit 16 calculates the sound pressure level for each speaker SP so that the sound pressure level decreases as the distance between each speaker SP and the virtual sound source PS increases. Good.

(2) In the above-described embodiment, the output gain calculation unit 16 calculates the sound pressure level at each speaker position by taking the reciprocal of the ratio of the distance, but the output gain calculation unit 16 uses two or more calculation means. It may be configured so that either calculation method is selected. That is, the ratio of each distance to the total distance between each speaker and the virtual sound source is converted by a monotonic decreasing function of a different algorithm, and a plurality of sound pressure levels at each speaker position are calculated according to the conversion result. The sound apparatus 1 includes a sound pressure level calculation unit and a selection unit that selects at least one of the plurality of sound pressure level calculation units, and the output gain calculation unit 16 selects the selected sound pressure level. You may make it calculate the sound pressure level of each speaker using a calculation means.

  In this case, more specifically, for example, the acoustic device 1 is provided with a calculation method selection input unit 15 (shown by a chain line in FIG. 1). When the operator performs an operation of selecting one of the calculation methods using the operation unit 11, the operation unit 11 outputs an operation signal corresponding to the operated content. This selection may be, for example, selection by a button by an operator's operation or selection by an encoder. Further, the calculation method may be selected by the operator performing a drag and drop operation using a mouse, or may be selected by inputting a numerical value with a numeric keypad. The calculation method selection input unit 15 selects or inputs which of the two types of calculation methods the output gain calculation unit 16 uses to calculate the output gain according to the signal from the operation unit 11.

  The output gain calculation unit 16 uses a method for calculating the sound pressure level using the reciprocal of the distance ratio shown in the above-described embodiment (hereinafter referred to as “first calculation method”) and the above-described modification example (1). The sound pressure level is calculated using one of two types of calculation methods, ie, a method of calculating the sound pressure level using the reciprocal of the square of the ratio of the distance (hereinafter “second calculation method”). In this case, the output gain calculation unit 16 calculates the sound pressure level using the selected calculation method based on the signal supplied from the calculation method selection input unit 15.

  Further, instead of the calculation method selection input unit 15 selecting a calculation method in accordance with the signal from the operation unit 11, the calculation method selection input unit 15 has at least one of the position of the speaker SP and the position of the virtual sound source. The calculation method may be selected based on the above. Specifically, for example, when the total distance between the speaker and the virtual sound source is equal to or less than a predetermined threshold, the calculation method selection input unit 15 uses the first calculation method to calculate the sound pressure level. On the other hand, in other cases, the sound pressure level may be calculated using the second calculation method. As described above, by properly using the calculation algorithm according to the position of the speaker or the virtual sound source and the distance between them, the accuracy of the sound pressure level calculation process for realizing the virtual sound source can be increased.

(3) In the above-mentioned embodiment, it is good also as a structure which provides the matrix mixer 17 as shown in FIG. In FIG. 6, the matrix mixer 17 distributes and supplies an input audio signal to each power amplifier 18, and performs sound pressure adjustment based on parameters supplied from the output gain calculation unit 16.

(4) In the above-described embodiment, the position of the virtual sound source may be changed in time series as time passes. In this case, the operator inputs the position and time of the virtual sound source in association with each other, and the output gain calculation unit 16 of the acoustic device 1 determines each of the positions based on the correspondence between the input position and time. The sound pressure level of the speaker may be calculated in time series.
Further, the locus of the virtual sound source may be input. In this case as well, the output gain calculation unit 16 of the acoustic device 1 may calculate the sound pressure level of each speaker according to the locus of the input virtual sound source.
Further, the moving state (acceleration, shaking, etc.) of the virtual sound source may be input. In this case, the input locus may be preset and activated using a time code or a MIDI signal when necessary. Also, time axis information may be input.

  As described above, when moving the position of the virtual sound source with the passage of time, real-time characteristics are necessary. However, according to the present invention, each speaker can be easily calculated without performing complicated calculations. Since the sound pressure level can be calculated, the position of the virtual sound source can be moved more smoothly.

(5) In the above-described embodiment, the virtual sound source is realized by using all the speakers installed in the space. However, instead of this, the speaker used by the acoustic device 1 may be selected. . Specifically, for example, the sound source device 1 may control so that a speaker whose distance from the virtual sound source is a predetermined value or less is used and no other speaker is used.
In this way, when the arrangement of multiple speakers forms a distorted polygon that deviates greatly from the regular polygon, it is possible to eliminate the speaker located at a unique vertex and execute the calculation. Thus, the calculation accuracy is improved.
Further, information indicating the contribution rate of each speaker is stored in advance in a storage unit or the like of the audio device 1 and used based on a process of comparing the stored contribution rate of each speaker with a weighting coefficient for each speaker. A speaker may be selected.

(6) In the above-described embodiment, a non-directional speaker is assumed, but a directional speaker may be used. In this case, information indicating the orientation of each speaker is stored in advance in the storage unit or the like of the acoustic device 1, and the acoustic device 1 is based on the orientation and position of each speaker and the position of the virtual sound source. A speaker to be used may be selected. Specifically, for example, when the directivity direction of the speaker is opposite to the direction of the position of the virtual sound source, the acoustic device 1 may be controlled not to use the speaker.
In addition, when a speaker having directivity is used, the sound pressure level of each speaker may be calculated by applying a coefficient that takes the directivity into consideration. In this case, for example, the distances D _{1 to} D4 ₁ in the above-described embodiment are multiplied by the directivity coefficients of the respective speakers to obtain D ₁ ′ to D ₄ ′, and the weighting coefficient R _{1 is} expressed by the equations (16) to (19). 'To R ₄ ' may be calculated.

(7) In the above-described embodiment, an equalizer for adjusting the sound quality (frequency characteristics) may be provided in the front stage of each power amplifier. According to this aspect, for example, when the position of the sound image is changed or the sound image is moved, the frequency characteristic at the sound receiving point is changed by changing the direction of the sound emitted from the corresponding speaker SP. Even if it exists, it becomes possible to adjust (change) the frequency characteristic of each speaker and the frequency characteristic of each speaker every moment by the equalizer mounted in the inside of the sound image localization apparatus 30.

(8) Each component of the acoustic device 1 such as the speaker coordinate input unit 12, the virtual sound source coordinate input unit 13, and the sound source input unit 14 in the above-described embodiment may be configured by a dedicated hardware circuit. Moreover, the structure implement | achieved as software, when the control part (CPU etc.) of the audio equipment 1 runs the computer program memorize | stored in memory | storage parts, such as ROM and HDD, may be sufficient. In addition, when each unit of the acoustic device 1 is realized as software, programs executed by the control unit of the acoustic device 1 are magnetic tape, magnetic disk, flexible disk, optical recording medium, magneto-optical recording medium, RAM, ROM Or the like recorded on a computer-readable recording medium. It is also possible to download to a computer device via a network such as the Internet.

It is a block diagram which shows an example of a structure of an audio equipment. It is a figure which shows an example of the coordinate of a speaker, and the coordinate of a virtual sound source. It is a figure which shows an example of the coordinate of a speaker, and the coordinate of a virtual sound source. It is a figure which shows an example of the coordinate of a speaker, and the coordinate of a virtual sound source. It is a figure which shows an example of the coordinate of a speaker, and the coordinate of a virtual sound source. It is a figure which shows an example of a structure of an audio equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Acoustic device, 11 ... Operation part, 12 ... Speaker coordinate input part, 13 ... Virtual sound source coordinate input part, 14 ... Sound source input part, 15 ... Calculation method selection input part, 16 ... Output gain calculation part, 17 ... Matrix mixer 18 ... Power amplifier, SP ... Speaker.

Claims (11)

Speaker position input means for inputting the position of each of the plurality of speakers;
Virtual sound source position input means for inputting the position of the virtual sound source;
Distance calculating means for obtaining each distance between the position of each speaker input by the speaker position input means and the position of the virtual sound source input by the virtual sound source position input means;
A ratio of each distance to the total of the distances calculated by the distance calculation means is converted by a monotonically decreasing function, and a sound pressure level calculation means for calculating a sound pressure level at each speaker position according to the conversion result;
A plurality of signal processing circuits for supplying audio signals to the speakers;
Sound pressure parameter setting means for setting a sound pressure parameter for each speaker so that the signal processing circuit has a sound pressure corresponding to the sound pressure level calculated by the sound pressure level calculating means. A characteristic acoustic device. The sound pressure level calculation means calculates a reciprocal of a ratio of each distance to a total of each distance calculated by the distance calculation means, and calculates a sound pressure level at each speaker position according to the calculation result. The acoustic device according to claim 1. The sound pressure level calculation means calculates the reciprocal of the power of the ratio of each distance to the total of the distances calculated by the distance calculation means, and calculates the sound pressure level at each speaker position according to the calculation result. The acoustic device according to claim 1, wherein the acoustic device is characterized. The ratio of each distance to the total of the distances calculated by the distance calculation means is converted by a monotonically decreasing function of a plurality of different algorithms, and a plurality of sounds for calculating the sound pressure level at each speaker position according to the conversion result Pressure level calculating means;
Selecting means for selecting at least one of the plurality of sound pressure level calculating means; and
The sound apparatus according to claim 1, wherein the sound pressure level calculation means calculates the sound pressure level using a sound pressure level calculation means selected by the selection means. 5. The selection unit according to claim 4, wherein the selection unit selects at least one of the plurality of sound pressure level calculation units according to an operation signal supplied from an operation unit operated by an operator. Sound equipment. The selection means selects at least one of the plurality of sound pressure level calculation means based on at least one of the position of each of the plurality of speakers and the position of the virtual sound source. The acoustic device according to claim 4. The virtual sound source position input means inputs time and the position of the virtual sound source in association with each other,
The distance calculation means calculates each distance between the position of each speaker and the position of the virtual sound source corresponding to the time in time series as time elapses,
The sound pressure level calculation means converts the ratio of each distance to the total of the distances calculated by the distance calculation means according to the calculation result of the distance calculation means by a monotonically decreasing function, and each speaker according to the conversion result The sound apparatus according to claim 1, wherein the sound pressure level at the position is calculated in time series. The virtual sound source position input means inputs a locus of the virtual sound source,
The distance calculating means calculates a distance between the position of each speaker and the position of the locus of the virtual sound source according to the input locus,
The sound pressure level calculation means converts the ratio of each distance to the total of the distances calculated by the distance calculation means according to the calculation result of the distance calculation means by a monotonically decreasing function, and each speaker according to the conversion result The sound apparatus according to claim 1, wherein the sound pressure level at a position is calculated. The sound pressure level calculation means includes a distance between the position of each speaker calculated by the distance calculation means and the position of the virtual sound source among the plurality of speakers smaller than a predetermined threshold value. The sound apparatus according to any one of claims 1 to 8, wherein a sound pressure level at each speaker position is calculated for the speaker. Storage means for storing directivity data indicating the directivity content of each of the plurality of speakers;
The sound pressure level calculation means converts the ratio of the distances to the total of the distances calculated by the distance calculation means by a monotone decreasing function, and the conversion results are stored in the plurality of speakers stored in the storage means. The sound apparatus according to any one of claims 1 to 9, wherein a sound pressure level at each speaker position is calculated according to a result of multiplication by multiplying a coefficient based on each directivity data. Computer
Speaker position input means for inputting the position of each of the plurality of speakers;
Virtual sound source position input means for inputting the position of the virtual sound source;
Distance calculating means for obtaining each distance between the position of each speaker input by the speaker position input means and the position of the virtual sound source input by the virtual sound source position input means;
A ratio of each distance to the total of the distances calculated by the distance calculation means is converted by a monotonically decreasing function, and a sound pressure level calculation means for calculating a sound pressure level at each speaker position according to the conversion result;
A plurality of signal processing circuits for supplying audio signals to the speakers;
A program for causing the signal processing circuit to function as a sound pressure parameter setting unit that sets a sound pressure parameter for each speaker so that the sound pressure level corresponds to the sound pressure level calculated by the sound pressure level calculation unit. .

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