JP6254864B2 - Multiple sound source placement apparatus and multiple sound source placement method - Google Patents

Description

  The present invention relates to an apparatus and method for arranging a plurality of sound sources corresponding to a multi-channel sound system.

  Movie and TV sound systems include the conventional 2ch stereo system, 5.1ch, 7.1ch, 8.2ch, and 10.2ch surround systems, and the 22.2 multichannel sound system proposed as the next-generation TV system. The number of channels is diverse. In content production of multi-channel sound, generally, the work becomes complicated as the number of channels increases, and the time required for production tends to increase. Therefore, it is desirable to construct an environment that allows intuitive and simple production.

  For example, in a conventional voice console, it is necessary to individually operate the three elements of volume fader (sound volume), equalizer (tone), and reverb feed to adjust the “distance of sound”. There was a problem of relying only on hearing. In order to eliminate such a complicated operation, a function that realizes a three-dimensional sound effect (such as sound distance control and direction control) necessary for program production without complicated operation has been proposed (for example, Non-patent document 1). According to the “distance fader” described in Non-Patent Document 1, it is possible to freely adjust three parameters related to the sense of distance of sound with one fader.

  Thus, by realizing the three-dimensional sound effect with a simple operation, the time required for content production is shortened, and more efficient sound production is possible. In addition to the sense of distance of sound, various stereophonic effects such as sound direction control and width (expansion) control are expected to be realized with simple operations.

Japanese Patent No. 501148 Japanese Patent No. 5010185

Satoshi Komiyama, Kimio Amagasaki, Hiroyuki Okubo, Wataru Hatano “Prototype of High-Functional Surround Mixer” Broadcast Technology 2004.6, pp.173-177 Doug Coulter, “Digital Audio Processing,” CMP Books R & D Developer Series pp.267-273

  By the way, “Chorus” is one of the three-dimensional sound effects necessary for program production. “Chorus” is an effect that makes a sound source sound as if multiple sound sources are being played. “Chorus” delays a very small amount of time from the original sound using a delay circuit, and shakes the sound at a fixed period (modulates at a low frequency) to produce the effect that multiple sounds are simultaneously. It is realized by an effector for a guitar or the like (for example, see Non-Patent Document 2). In order to easily realize the chorus effect in a multi-channel sound system, the original sound source signal can be arranged at a plurality of arbitrary positions in a plane or space with a simple operation, and each distributed sound signal is converted into a chorus effect. It is necessary to pass through the application circuit.

  However, multi-channel sound systems such as 5.1ch surround system and 22.2 multi-channel sound system have “chorus faders” (such as the “distance fader” described earlier) to easily realize the chorus effect. There is no interface), and engineers must fine-tune the parameters of each sound source manually. Specifically, as illustrated in FIG. 11, each original sound source is individually separated using a mixing console panpot, a three-dimensional amplitude panning apparatus (see, for example, Patent Documents 1 and 2), or the like. A process of giving a chorus effect to each sound source after being arranged at a desired position by operation is required. For this reason, the work is complicated and the time required for production is long. Further, the occurrence of complicated work is not limited to the chorus effect, and can similarly occur for any stereophonic effect in which the original sound source signal is arranged at any of a plurality of positions in a plane or space.

  Therefore, an object of the present invention made in view of such points is to provide a multi-channel sound system that can set a plurality of sound sources from a single sound source signal by simple parameter setting without complicated operations. It is to provide an apparatus and method.

  In order to solve the above-described problems, a multiple sound source placement device according to the present invention is a multiple sound source placement device that places a single sound source signal as a multi-channel sound signal as a plurality of sound sources, and includes an interface for setting the multiple sound sources. A display unit for displaying; a sound source position setting unit for setting the position of each sound source of the plurality of sound sources based on an input to the interface; a coordinate conversion unit for converting the position of each sound source to polar coordinates; and the polar coordinates of each sound source And a signal distribution unit that distributes the sound source signal to the corresponding speakers based on the information, and the interface can collectively set the plurality of sound sources.

  The interface preferably includes an interface object for inputting a distribution range and number of the plurality of sound sources.

  Moreover, it is preferable that an interface object is set for each sound effect by the plurality of sound sources.

  As described above, the solution of the present invention has been described as an apparatus. However, the present invention can be realized as a method, a program, and a storage medium storing the program, which are substantially equivalent thereto, and the scope of the present invention. It should be understood that these are also included.

  For example, a plurality of sound source arrangement methods realized as a method of the present invention are a plurality of sound source arrangement methods by a plurality of sound source arrangement devices that arrange one sound source signal as a plurality of sound sources as a multi-channel sound signal, and an interface for setting the plurality of sound sources. Displaying the sound source signal based on the input to the interface, setting the position of each sound source of the plurality of sound sources, converting the position of each sound source to polar coordinates, and the sound source signal based on the polar coordinates of each sound source Distributing the sound to corresponding speakers, wherein the interface can collectively set the plurality of sound sources.

  According to the multiple sound source setting apparatus and method of the present invention, it is possible to set a plurality of sound sources from a single sound source signal by simple parameter setting without complicated operations in a multi-channel acoustic system.

It is a figure which shows the structure of the multiple sound source arrangement | positioning apparatus which concerns on one Embodiment of this invention. It is a figure which shows the outline | summary of the stereophonic sound effect setting by a multiple sound source arrangement | positioning apparatus. It is a figure which shows an example of the interface which can set a several sound source collectively. It is a figure which shows the other example of the interface which can set a several sound source collectively. It is a figure which shows the conversion from a rectangular coordinate to a polar coordinate. It is a figure which shows the outline | summary of a three-dimensional amplitude panning. It is a figure which shows the specific example of sound source signal distribution. It is a figure which shows the principle of a chorus effect. It is a figure which shows the structural example of a chorus effect provision circuit. It is a figure which shows an example of the interface for every stereophonic effect. It is a figure which shows the outline | summary of the conventional stereophonic sound effect setting.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a multiple sound source arrangement device according to an embodiment of the present invention. The multiple sound source arrangement device includes a control unit 10 including a sound source position setting unit 11, a coordinate conversion unit 12, and a signal distribution unit 13, a display unit 20, and an operation unit 30, and is connected to the speaker SP through the signal distribution unit 13. Is done. Each processing unit 11 to 13 of the control unit 10 is configured by a suitable processor, and each processing unit 11 to 13 can be implemented by a common processor or can be implemented as an individual processor. The display unit 20 is a suitable display, and the operation unit 30 is a suitable operation device. The user of the multiple sound source placement device confirms the interface displayed on the display unit 20 while the operation unit 30 makes a request to the multiple sound source placement device. The input operation can be performed. The speaker SP is a speaker group compatible with the multi-channel acoustic system, and the acoustic signal output from the multiple sound source arrangement device is reproduced from the speaker SP corresponding to each channel.

  First, the setting of the stereophonic effect by the multiple sound source arrangement device according to the present embodiment will be outlined. FIG. 2 is a diagram showing an outline of setting the stereophonic sound effect by the multiple sound source arrangement device. According to the multiple sound source arrangement device according to the present embodiment, when a single sound source signal is used as a plurality of sound sources, it is not necessary to perform individual operations on each sound source as in the conventional method illustrated in FIG. It is possible to give various three-dimensional sound effects corresponding to the multi-channel sound system to all the plural sound sources by the collective operation.

The sound source position setting unit 11 sets the position of each sound source of a plurality of sound sources based on the input to the interface displayed on the display unit 20, and the interface can set a plurality of sound sources at once. FIG. 3 is a diagram showing an example of an interface capable of setting a plurality of sound sources at once. The interface displayed by the display unit 20 is an interface object 21 that illustrates the sound source positions of a plurality of sound sources k1, k2,..., Kn, and an interface for setting a sound source distribution range (width w, depth d, height h). An object 22 and an interface object 23 for setting the number of sound sources (horizontal Nw, depth Nd, vertical Nh) are displayed. Here, the interface object constitutes an interface capable of collectively setting a plurality of sound sources, and indicates interface parts such as an information display area, an input form, and a button. Here, the interface object 22, and the length of each side of the plane or space surrounded by the speaker SP and _{w 0, d 0, h 0} , the value of _{w ≦ w 0, d ≦ d} 0, h ≦ h 0 Is set. The sound source position setting unit 11 automatically sets the position of each sound source based on the input distribution range and number of the plurality of sound sources so that the plurality of sound sources have a predetermined distribution such as an equal interval and a normal distribution for each direction. To do.

  FIG. 4 is a diagram illustrating another example of an interface capable of collectively setting a plurality of sound sources. The interface displayed by the display unit 20 displays an interface object 21 illustrating the sound source positions of a plurality of sound sources k1, k2,... Kn, and an interface object 24 for setting the coordinates of each sound source. In this case, the sound source position setting unit 11 sets the value input to the interface object 24 as it is as the position of each sound source.

  Note that the interface capable of setting a plurality of sound sources at once is not limited to the examples of FIGS. 3 and 4, and may be an interface including only the interface object 21 illustrating the sound source position, for example. In this case, the user graphically sets a plurality of sound sources on the interface object 21 by operating an icon representing a sound source, and the sound source position setting unit 11 can automatically acquire the set position of each sound source. . In other words, when the multiple sound source arrangement device is configured as a PC or a tablet terminal, a specific parameter value of each sound source may be input on the interface, or the user can freely arrange sound sources on the touch panel or the like. The value of each parameter may be acquired from the position information.

  The coordinate conversion unit 12 converts the position (orthogonal coordinates) of each sound source set by the sound source position setting unit 11 into polar coordinates, and acquires direction information of each sound source when viewed from the sound receiving point. FIG. 5 is a diagram illustrating conversion from orthogonal coordinates to polar coordinates. When a sound source represented by orthogonal coordinates (x, y, z) = (w, d, h) is converted into polar coordinates (r, θ, φ) in the coordinate system having the sound receiving point as the origin, The conversion is performed by the following formulas (1) to (3).

  The signal distribution unit 13 distributes the sound source signal to the corresponding speaker SP based on the polar coordinates of each sound source. For example, as an example, the signal distribution unit 13 can distribute a sound source signal to each speaker SP using three-dimensional amplitude panning, and can localize a plurality of sound sources arranged at arbitrary positions. FIG. 6 is a diagram showing an outline of three-dimensional amplitude panning. In the three-dimensional amplitude panning, three speakers that spatially surround the sound source K to be localized are used. If the weighting coefficients of the three speakers SP1-3 obtained from the polar coordinates (r, θ, φ) of the sound source K are g1-3, the signal distribution unit 13 outputs Yn of each speaker SPn (n = 1-3). The sound source signal S (t) is distributed to each speaker so that (t) becomes gn × S (t). Note that the weighting factor of each speaker is determined so as to reproduce the sound intensity at the sound receiving point when the actual speaker is placed at the sound source position to be localized. Can be used and will not be described in detail here. In the case of FIG. 6, the sound image is generated at the position of the sound source K by reproducing the sound from the speaker SP1 to g1 × S (t), from the speaker SP2 to g2 × S (t), and from the speaker SP3 to g3 × S (t). It is localized.

  FIG. 7 is a diagram showing a specific example of sound source signal distribution. In FIG. 7, the sound source signal S (t) is localized to the two sound sources K1 and K2 by the four speakers SP1 to SP4 arranged in the three-dimensional space. The sound source K1 exists on a plane surrounded by three speakers (SP1, SP2, SP3), and the sound source K2 exists on a plane surrounded by three speakers (SP1, SP3, SP4). And

  First, setting of the two sound sources K1 (w1, d1, h1) and K2 (w2, d2, h2) is performed by the sound source position setting unit 11 through an interface that can be collectively set. Next, the coordinate conversion unit 12 converts the orthogonal coordinates of the sound sources K1 and K2 into polar coordinates, and acquires the polar coordinates (r1, θ1, φ1) of the sound source K1 and the polar coordinates (r2, θ2, φ2) of the sound source K2. The signal distribution unit 13 determines a weighting coefficient for distributing the sound source signal to the corresponding speaker based on the polar coordinates of each sound source by three-dimensional amplitude panning. The weighting factors of the three speakers (SP1, SP2, SP3) for the sound source K1 are (g1, g2, g3), and the weighting factors of the three speakers (SP1, SP3, SP4) for the sound source K2 are (g1 ′, g3 ′). , G4), the signal reproduced from each speaker for each sound source is expressed as shown in Table 1 below.

  When the reproduction signals for the respective sound sources are integrated, signals Yn (t) (n = 1 to 4) reproduced from the respective speakers are represented as shown in Table 2 below.

  As shown in Table 2, the signal distribution unit 13 distributes the sound source signals to the speakers SP1 to SP4, so that the signal distribution unit 13 can be localized at the positions of the sound sources K1 and K2. Even if the number of sound source positions increases, the same procedure may be performed.

  Next, setting of the chorus effect will be described in detail as an application example of the stereophonic effect using the multiple sound source arrangement device. FIG. 8 is a diagram illustrating the principle of the chorus effect. A chorus effect is realized by adding a slightly delayed signal (chorus signal) (dotted line) to the input signal (solid line) as a plurality of sound sources. Here, the three sound sources indicated by the dotted lines in FIG. 8 can be collectively set by a plurality of sound source arrangement devices. In the multiple sound source arrangement device shown in FIG. 1, a chorus effect can be easily realized in a multichannel acoustic system by inserting a chorus effect applying circuit between the signal distributor 13 and the speaker SP.

  FIG. 9 shows a configuration example of the chorus effect applying circuit. The delay times of the delay devices 41 to 43 are set to about 10 to 50 msec, and the time interval between the input signal and the chorus signal is periodically changed (around 1 Hz) by the low frequency oscillators 51 to 53. Then, the chorus effect is realized by outputting the input signal and the chorus signal together.

  As described above, according to the present embodiment, since the sound source signal is distributed to the corresponding speakers based on the input to the interface capable of setting a plurality of sound sources at once, the multichannel sound system does not involve complicated operations. It is possible to set a plurality of sound sources from a single sound source signal with only simple parameter settings. For example, in a multi-channel sound system such as a 5.1ch surround system or 22.2 multi-channel sound system, the original sound source signal is surrounded by each speaker with simple parameter settings without complicated operations. Alternatively, the chorus effect can be realized by arranging them at a plurality of arbitrary positions in the space at once.

  Also, by including an interface object that inputs the distribution range and number of multiple sound sources, the user can set the position of each sound source individually using a mixing console panpot, 3D amplitude panning device, etc. The sound source position setting unit 11 can automatically set the position of each sound source. That is, the user can give a desired stereophonic effect by a simpler operation.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each functional unit, each step, etc. can be rearranged so that there is no logical contradiction, and multiple functional units, steps, etc. can be combined or divided into one It is.

  For example, in the above embodiment, the signal distribution unit 13 is described as performing signal distribution based on the three-dimensional amplitude panning method, but any other sound source localization control method can be used.

  8 and 9 show the case where three chorus signals are added to the input signal. However, if at least one chorus signal is added to the input signal, the chorus effect is realized. The chorus function used by instruments such as guitars and synthesizers achieves the chorus effect by outputting the original signal and the chorus signal from the same instrument, but this device plays each chorus signal from a separate speaker. By doing so, the chorus effect in the multi-channel sound system can be realized.

  Further, the application range of the multiple sound source arrangement device according to the present invention is not limited to the chorus effect, and can be used for setting an arbitrary stereophonic effect. Can be used in combination with a suitable circuit or device.

  For example, in the case of providing a surround sound (a sound spread feeling) intended as a three-dimensional sound effect, such as a diffuse sound field in a concert hall (a state in which sounds having the same timbre and uncorrelated sounds arrive from each arrival direction) Are required to have similar timbres and low correlation with each other. According to the multiple sound source arrangement device according to the present invention, it is possible to collectively set a plurality of sound sources having similar timbres and low correlations based on one sound source signal. Further, by providing a suitable delay circuit or the like between the signal distribution unit 13 and the speaker SP, it is possible to easily realize a highly realistic surround feeling.

  In addition, an interface that can set a plurality of sound sources at once can set an interface object for each sound effect of the plurality of sound sources. Accordingly, the user can set the three-dimensional sound effect with an optimum interface for each sound effect. FIG. 10 is a diagram illustrating an example of an interface for each stereophonic effect. For example, when the interface object 25 for setting the chorus effect is selected as shown in FIG. 10A, a plurality of sound sources suitable for the chorus effect are shown in the interface object 21, and an interface object for inputting information on the plurality of sound sources. 27 is displayed. Further, when the interface object 26 for setting the surround effect is selected as shown in FIG. 10B, a plurality of sound sources suitable for the surround effect are illustrated in the interface object 21, and an interface object for inputting information on the plurality of sound sources. 28 is displayed. Note that the stereophonic effect in which the interface can be individually set is not limited to the chorus effect and the surround effect, and can be set for any stereophonic effect.

  Furthermore, regarding the addition of the stereophonic sound effect, it is also possible to realize the stereophonic sound effect only by the multiple sound source placement device without adding an additional circuit or device to the multiple sound source placement device. For example, for each sound source position that is logically determined from the range, number, coordinates, etc. of multiple sound sources, by adding differential position information based on a random number or the like to generate an intentional “deviation” at each sound source position The delay and correlation of the signal itself distributed to each speaker by the signal distributor 13 changes, and the effects such as delay between signals and decorrelation required by the chorus effect and the surround effect can be realized by software processing. .

DESCRIPTION OF SYMBOLS 10 Control part 11 Sound source position setting part 12 Coordinate conversion part 13 Signal distribution part 20 Display part 21-28 Interface object 30 Operation part 41-43 Delay device 51-53 Low frequency oscillator SP (SP1-4) Speaker

Claims (4)

A multiple sound source arrangement device that arranges one sound source signal as a plurality of sound sources as a multi-channel acoustic signal,
A display for displaying an interface for setting the plurality of sound sources;
A sound source position setting unit that sets the position of each sound source of the plurality of sound sources based on an input to the interface;
A coordinate converter for converting the position of each sound source to polar coordinates;
A signal distribution unit that distributes the sound source signal to a corresponding speaker based on the polar coordinates of each sound source,
The plurality of sound source arrangement devices, wherein the interface is capable of collectively setting the plurality of sound sources.   The multiple sound source arrangement device according to claim 1, wherein the interface includes an interface object that inputs a distribution range and number of the multiple sound sources.   The multiple sound source arrangement device according to claim 1, wherein an interface object is set for each sound effect of the multiple sound sources in the interface. A multi-sound source placement method by a multi-sound source placement device that places a single sound source signal as a multi-sound source as a multi-channel sound signal,
Displaying an interface for setting the plurality of sound sources;
Setting the position of each sound source of the plurality of sound sources based on the input to the interface;
Converting the position of each sound source to polar coordinates;
Distributing the sound source signal to a corresponding speaker based on polar coordinates of each sound source, wherein the interface is capable of collectively setting the plurality of sound sources.

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