WO2019168083A1 - 音響信号処理装置、音響信号処理方法および音響信号処理プログラム - Google Patents
音響信号処理装置、音響信号処理方法および音響信号処理プログラム Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
- H04R2201/403—Linear arrays of transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/07—Generation or adaptation of the Low Frequency Effect [LFE] channel, e.g. distribution or signal processing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/11—Positioning of individual sound objects, e.g. moving airplane, within a sound field
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/07—Synergistic effects of band splitting and sub-band processing
Definitions
- the present invention relates to an acoustic signal processing device, an acoustic signal processing method, and an acoustic signal processing program for converting an input acoustic signal into an output acoustic signal to each speaker of a speaker array configured by arranging a plurality of speakers for realizing a virtual sound source.
- an acoustic signal processing device for converting an input acoustic signal into an output acoustic signal to each speaker of a speaker array configured by arranging a plurality of speakers for realizing a virtual sound source.
- Patent Document 1 There is a method called wavefront synthesis for sound reproduction technology that creates a virtual sound source in a screening space (Patent Document 1).
- the method based on Patent Literature 1 collects sound signals at points where sound signals are recorded with microphones installed at a plurality of points, analyzes the arrival directions of the sound signals in the vertical and horizontal directions, and installs them in a screening space.
- the sound signal of the recording venue is physically reproduced using multiple speakers.
- Non-patent Document 1 There is a technology that can create a virtual sound image in front of a speaker by assuming a suction type sound source (acoustic sink) as an assumed virtual sound source and giving a drive signal derived from the first type Rayleigh integration to the speaker array.
- Non-patent Document 2 there is a technology that can realize primitive directivity such as a dipole in a virtual sound source generated in a screening space using a linear speaker array.
- Multipole sound source is a technique that expresses sound directivity with a combination of primitive directivity such as dipole and quadrapole. (Pole sound source) combination.
- Non-Patent Document 3 discloses that in order to rotate the direction of directivity, primitive directivities having different intensities are overlapped.
- an object of the present invention is to provide an acoustic signal processing device, an acoustic signal processing method, and an acoustic signal processing program that realize an arbitrary directivity by superimposing multipole elements.
- a first feature of the present invention is that sound that converts an input sound signal into an output sound signal to each speaker of a speaker array configured by arranging a plurality of speakers for realizing a virtual sound source.
- the present invention relates to a signal processing device.
- the acoustic signal processing device acquires a plurality of initial focal coordinates, a virtual sound source coordinate, and a directionality direction, and a pair of initial focal points having different polarities among the plurality of initial focal coordinates.
- the coordinates are determined by multiplying the initial focal coordinates by the rotation matrix specified from the direction of directivity to determine the focal coordinates, and the multiples including the focal coordinates from the circular harmonic coefficients.
- Circular harmonic coefficient converter for calculating weights to be given to the poles, and filter coefficients for calculating the weighted drive function to be given to the speakers from the focal coordinates, the polarities of the focal coordinates, and the weights to be given to the multipoles for each speaker of the speaker array
- a convolution that convolves the input acoustic signal with a weighted drive function corresponding to the loudspeaker and outputs the acoustic signal output to the loudspeaker. Comprising a write operation unit.
- the circular harmonic coefficient conversion unit may calculate the weight given to the multipole according to the equation (1).
- the filter coefficient calculation unit calculates a drive function using each of the focal coordinates, and gives to each of the multipoles a combined drive function calculated from the polarities and drive functions of the respective focal coordinates constituting the multipole, and the multipole.
- a weighted drive function to be given to the speaker may be calculated from the weight.
- the filter coefficient calculation unit may calculate a composite drive function of the multipole by adding a function obtained by multiplying the polarity of the focus coordinate and the drive function for each focus coordinate included in the multipole.
- the filter coefficient calculation unit may calculate the weighted drive function by adding the weight given to the multipole to the combined drive function calculated for each of the multipoles.
- the second feature of the present invention relates to an acoustic signal processing method for converting an input acoustic signal into an acoustic signal output to each speaker of a speaker array configured by arranging a plurality of speakers for realizing a virtual sound source.
- the acoustic signal processing method according to the second aspect of the present invention includes a step of acquiring a plurality of initial focal coordinates, a virtual sound source coordinate and a direction of directivity, and a plurality of initial focal coordinates among the plurality of initial focal coordinates.
- the step of determining the focal coordinates by multiplying the initial focal coordinates by the rotation matrix specified from the directivity direction based on the coordinates of the virtual sound source, and the circular harmony coefficient , Calculating a weight to be given to the multipole including the focus coordinates, and, for each speaker of the speaker array, calculating a weighted drive function to be given to the speaker from the focus coordinates, the polarity of the focus coordinates, and the weight given to the multipole.
- the output acoustic signal to the speaker is convolved with the input acoustic signal by a weighted drive function corresponding to the speaker. Comprising the step of outputting.
- the third feature of the present invention relates to an acoustic signal processing program for causing a computer to function as the acoustic signal processing device described in the first feature.
- an acoustic signal processing device an acoustic signal processing method, and an acoustic signal processing program that realize an arbitrary directivity by superimposing multipole elements.
- FIG. 1 is a block diagram of an acoustic signal processing device according to an embodiment of the present invention. It is a figure explaining the directional characteristic implement
- the acoustic signal processing device 1 is a general computer including a processing device (not shown), a memory 10 and the like.
- the functions shown in FIG. 1 are realized by a general computer executing an acoustic signal processing program.
- the acoustic signal processing apparatus 1 uses a linear speaker array in which a plurality of speakers are arranged in a straight line as shown in FIG. Realizes a virtual sound source that protrudes to the front and has directivity.
- a case where the speakers constituting the speaker array are arranged in a straight line will be described, but the present invention is not limited to this.
- the speaker array may be composed of a plurality of speakers, and the plurality of speakers may not be arranged in a straight line.
- a multipolar sound source in order to realize a virtual sound source, is realized by generating two or more focal sound sources having different polarities at positions close to each other.
- the focal sound source is a combination of omnidirectional point sound sources (monopole sound sources) having different polarities.
- the focal sound source includes two multipoles, one multipole is composed of one monopole sound source, and the other multipole is composed of two monopole sound sources having different polarities.
- the present invention is not limited to this.
- the multipole M1 and the multipole M2 shown in FIG. 2A are overlapped to realize the directivity shown in FIG.
- the multipole M1 has a focal point P1 having a positive polarity
- the multipole M2 has a focal point P2 having a negative polarity and a focal point P3 having a positive polarity.
- the embodiment of the present invention realizes the directivity characteristics of the multipole sound source shown in FIG. 2B by weighting and superimposing the multipole M1 and the multipole M2, respectively. As shown in FIG. 2B, by superimposing multipole elements having various directivity characteristics, it becomes possible to realize the desired directivity characteristics within a desired range.
- the acoustic signal processing device 1 converts the input acoustic signal I into an output acoustic signal O to each speaker of the linear speaker array in order to realize such a virtual sound source.
- the acoustic signal processing apparatus 1 includes a memory 10, a focal position determination unit 12, a circular harmonic coefficient conversion unit 13, a filter coefficient calculation unit 14, a convolution calculation unit 15, an input / output interface (not shown), and the like.
- the input / output interface is an interface for inputting an input acoustic signal to the acoustic signal processing device 1 and outputting an output acoustic signal to each speaker.
- the input / output interface inputs information on the coordinates of the virtual sound source and the directionality of the virtual sound source realized by the acoustic signal processing device 1 and the circular harmonic coefficient to the acoustic signal processing device 1.
- the memory 10 stores the focus data 11.
- the focus data 11 associates the coordinates of a plurality of focal points for realizing a virtual sound source with the polarities of the respective focal points.
- the focus stored in the focus data 11 is referred to as an initial focus, and the initial focus coordinates are referred to as initial focus coordinates.
- the focal position determination unit 12 receives information on the position of the virtual sound source, directionality direction, and target frequency, and outputs coordinates related to a necessary number of focal points in consideration of directivity.
- the focal position determination unit 12 acquires a plurality of initial focal coordinates, the coordinates of the virtual sound source and the direction of directivity, and sets a pair of initial focal coordinates having different polarities among the plurality of initial focal coordinates as the coordinates of the virtual sound source. Based on this, the focus coordinates are determined by multiplying the initial focus coordinates by the rotation matrix specified from the direction of directivity.
- the focal position determination unit 12 multiplies the relative coordinates of the initial focal coordinates with respect to the coordinates of the virtual sound source by applying a rotation matrix, adds the coordinates of the virtual sound source to the coordinates obtained by applying the rotation matrix, and takes the directivity into consideration. Determine the coordinates. Note that the virtual sound source is the center of the focal coordinate.
- the focal position determination unit 12 determines the initial focal coordinates as the focal coordinates without converting any initial focal coordinates that are not paired among the plurality of initial focal coordinates.
- the focus position determination unit 12 outputs a positive polarity initial focus coordinate as the focus coordinate.
- the focus position determination unit 12 outputs coordinates obtained by rotating these initial focus coordinates as focus coordinates.
- the focal position determination unit 12 acquires a pair of or more initial focal coordinates having different polarities from the memory 10 and, as a characteristic realized by the acoustic signal processing device 1, coordinates of the virtual sound source and direction of directivity by external input or the like. To get.
- the focal position determination unit 12 specifies the rotation direction ⁇ applied to the initial focal coordinates from the acquired directivity direction.
- the focal position determination unit 12 determines a pair of initial focal coordinates as When the ⁇ direction is designated with respect to the X-axis direction, the rotation matrix G that can be specified from this direction is obtained by Equation (1), and therefore the coordinates of the monopole after rotation can be determined by Equation (2). .
- the focal position determination unit 12 applies a rotation matrix that can be specified from the direction of directivity to each coordinate with respect to one or more pairs of initial focal coordinates corresponding to desired characteristics read from the memory, and then coordinates the coordinates of the virtual sound source. All focal coordinates are calculated by adding each time.
- the focal position determination unit 12 outputs a multipole identifier, a focal coordinate constituting the multipole, and a polarity of each focal coordinate in association with each other.
- the coordinates of the monopole sound source corresponding to the rotation of the directivity are calculated by rotating the rotation matrix and calculating new coordinates.
- the focal position determination unit 12 performs the process of FIG. 3 on a pair of initial focal coordinates having different polarities, and outputs initial focal coordinates as focal coordinates for other initial focal coordinates.
- the focal position determination unit 12 acquires information on the coordinates of the virtual sound source and the direction of directivity, and in step S12, reads information on one or more initial focal points corresponding to a desired specification.
- step S12 the focus position determination unit 12 repeats the processes in steps S13 and S14.
- step S13 the focal position determination unit 12 applies the rotation matrix specified from the direction of directivity acquired in step S11 to the target focal coordinates to be processed.
- the target focal point coordinates used here are relative coordinates with respect to the virtual sound source.
- step S ⁇ b> 14 the focal position determination unit 12 adds the coordinates after applying the rotation matrix in step S ⁇ b> 13 to the coordinates of the virtual sound source, and determines the focal coordinates in consideration of directivity.
- step S13 and step S14 When the processing of step S13 and step S14 is completed for each initial focus read in step S12, the focus position determination unit 12 ends the processing.
- or step S14 should just be performed with respect to each focus, and may be performed in what order.
- FIG. 4 shows a linear speaker array and initial focus.
- the linear speaker array is arranged from ( ⁇ 2, 0) to (2, 0), and a pair of initial focal coordinates are (0, 1 ⁇ 0.0345) and (0, 1 + 0.0345). .
- the coordinates of the virtual sound source are (0, 1).
- the sound field at this time is formed symmetrically and has no directivity.
- the focal position determination unit 12 multiplies such initial focal coordinates by the rotation matrix specified by Expression (1). As shown in FIG. 5, the relative coordinates of the initial focal point coordinates (1, 1.0345) with respect to the virtual sound source coordinates (0.0, 1.0) are (0.0, 0.0345). The focal position determination unit 12 multiplies the relative coordinates of the initial focal coordinates with respect to the virtual sound source coordinates by multiplying the rotation matrix and adds the virtual sound source coordinates to obtain the rotated coordinates (0.0172, 1.0299). . By similarly processing the other initial focus coordinates (0, 1-0.0345), the focus position determination unit 12 obtains the rotated coordinates ( ⁇ 0.0172, 0.9701).
- FIG. 6 shows the sound field at the coordinates after rotation obtained by the calculation of FIG.
- Each monopole coordinate is rotated clockwise as compared with FIG. 4 to realize directivity.
- the filter coefficient calculation unit 14 processes the focal point coordinates.
- the circular harmonic coefficient conversion unit 13 calculates the weight given to the multipole including the focal coordinates from the circular harmonic coefficient.
- the circular harmonic coefficient conversion unit 13 analytically converts the circular harmonic series to determine the weight to be given to each focal sound source, and realizes the generation of a virtual sound image having the directivity characteristic of a real sound source.
- the circular harmony coefficient conversion unit 13 calculates a weight to be given to each multipole including each focal coordinate output from the focal position determination unit 12.
- the circular harmonic coefficient conversion unit 13 calculates the weight given to the multipole by the equation (3).
- Equation (3) m and n are the orders of the partial differentiation of the sound field with respect to the x-axis direction and the y-axis direction, respectively, but the combination of m and n does not overlap and may be treated as a simple index.
- the circle harmonic coefficient conversion unit 13 acquires the circle harmonic coefficient as appropriate.
- the circular harmonic coefficient may be received from an external program, or may be obtained by observing with a plurality of microphones arranged on a circle centering on a sound source to be measured for directivity.
- the circular harmonic coefficient may be stored in advance in a separately provided memory and read by the circular harmonic coefficient conversion unit 13 as necessary.
- Equation (3) for outputting the weight of the multipole from the circular harmonic coefficient.
- a sound source having an arbitrary directivity is assumed at the origin on the xy plane, and a sound field generated by this sound source is S (x).
- Equation (3) the weighting factor can be calculated as in Equation (3).
- the circular harmonic coefficient conversion unit 13 performs the process of step S21 on each multipole output by the focal position determination unit 12. In step S21, the circular harmonic coefficient conversion unit 13 calculates the weight of the multipole from the circular harmonic coefficient according to Equation (3).
- the filter coefficient calculation unit 14 calculates, for each speaker in the speaker array, a weighted drive function given to the speaker from the focus coordinate, the polarity of the focus coordinate, and the weight given to the multipole.
- the filter coefficient calculation unit 14 calculates a weighted drive function to be convoluted with the input acoustic signal I from each of the focal coordinates determined by the focal position determination unit 12 for each speaker of the linear speaker array.
- the filter coefficient calculation unit 14 calculates a drive function using each of the focal coordinates, and for each multipole, a combined drive function calculated from the polarity of each focal coordinate constituting the multipole and the drive function, and a multipole.
- a weighted drive function to be given to the speaker is calculated from the given weight.
- the filter coefficient calculation unit 14 adds a function obtained by multiplying the polarity of the focal coordinate and the drive function for each focal coordinate included in the multipole, thereby calculating a combined driving function of the multipole. Further, the filter coefficient calculation unit 14 adds a weight given to the multipole to the combined drive function calculated for each multipole, and calculates a weighted drive function.
- the filter coefficient calculation unit 14 calculates the drive function for each focal point using the equation (7).
- the filter coefficient calculation unit 14 calculates the combined drive function according to Expression (8) from the polarity of the focal sound source belonging to this multipole and the drive function of each focus calculated according to Expression (7). Is calculated.
- the filter coefficient calculation unit 14 applies the weight calculated by the circular harmonic coefficient conversion unit 13 to the combined drive function calculated by Expression (8) for each multipole, and calculates the weighted drive function by Expression (9). calculate.
- step S31 the filter coefficient calculation unit 14 acquires each focal point coordinate determined by the focal position determination process. At this time, the filter coefficient calculation unit 14 also obtains the relationship between the polarities of the focal points and the focal coordinates constituting the multipole.
- the filter coefficient calculation unit 14 repeats the processing from step S32 to step S37, and calculates a weighted drive function for each speaker. In step S32, the filter coefficient calculation unit 14 initializes the weighted drive function of the target speaker with zero.
- the filter coefficient calculation unit 14 repeats the process of step S33 for each focus.
- step S33 the filter coefficient calculation unit 14 calculates a drive function using the coordinates of the target focus.
- the filter coefficient calculation unit 14 calculates the driving function of each focus using Expressions E11 to E13.
- the filter coefficient calculation unit 14 repeats the processing from step S34 to step S36 for each multipole, and calculates the combined drive function of each multipole.
- step S ⁇ b> 34 the filter coefficient calculation unit 14 initializes the composite drive function of the multipole to be processed.
- the filter coefficient calculation unit 14 performs the process of step S35 for each focus included in the multipole to be processed.
- step S35 the filter coefficient calculation unit adds the target focus drive function calculated in step S33 to the combined drive function using the target focus polarity.
- the filter coefficient calculation unit 14 calculates Formula E21 for the multipole M1, and calculates Formula E22 for the multipole M2.
- step S36 the filter coefficient calculation unit 14 calculates the weighted drive function by multiplying the combined drive function calculated in step S35 by the weight calculated by the circular harmonic coefficient conversion unit 13.
- the filter coefficient calculation unit 14 calculates the weight of the multipole M2 to the function obtained by multiplying the multipole M1 by the weight of the multipole M1 and the formula E22 calculated for the multipole M2 to the formula E21 calculated for the multipole M1.
- the weighted drive function of E31 is calculated by adding to the function multiplied by.
- step S37 the filter coefficient calculation unit 14 outputs the weighted drive function obtained after calculation for each multipole as a weighted drive function to be given to the target speaker.
- the convolution calculation unit 15 applies the weighted drive function to the input acoustic signal I to give to each speaker.
- An output acoustic signal O is calculated.
- the convolution operation unit 15 convolves the input acoustic signal I with a weighted drive function corresponding to the speaker for each speaker of the linear speaker array, and outputs an output acoustic signal O to the speaker.
- the convolution operation unit 15 obtains an output acoustic signal O for a predetermined speaker by convolving a weighted drive function corresponding to the speaker with the input acoustic signal I.
- the convolution operation unit 15 repeats the same processing for each speaker to obtain an output acoustic signal O for each speaker.
- the convolution operation unit 15 repeats the processing of step S41 and step S42 for each speaker of the linear speaker array.
- step S ⁇ b> 41 the convolution calculation unit 15 acquires a weighted drive function of the target speaker to be processed from the filter coefficient calculation unit 14.
- step S42 the input acoustic signal I is convolved with the weighted drive function obtained in step S31 to obtain the output acoustic signal O.
- step S41 to step S42 When the processing from step S41 to step S42 is completed for each speaker, the convolution calculator 15 ends the processing. Note that the processing from step S41 to step S42 may be performed on each speaker, and may be performed in any order.
- the acoustic signal processing apparatus 1 calculates the focal coordinates that realize the desired directivity by rotating the initial focal coordinates in advance, and applies each focal point to each speaker.
- the corresponding weighted drive function is calculated.
- the acoustic signal processing apparatus 1 obtains an output acoustic signal O to each speaker by convolving a weighted drive function corresponding to each speaker with the input acoustic signal I.
- the weight converted from the circular harmonic coefficient is given for each multipole element. Therefore, by appropriately setting the circular harmonic coefficient, the output acoustic signal O to each speaker can be arbitrarily set. It becomes possible to adjust.
- the acoustic signal processing apparatus 1 according to the embodiment of the present invention can model directivity of a sound source such as a musical instrument, and can realize arbitrary directivity characteristics by superimposing multipoles.
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Abstract
Description
図1を参照して、本発明の実施の形態に係る音響信号処理装置1を説明する。音響信号処理装置1は、処理装置(図示せず)、メモリ10などを備える一般的なコンピュータである。一般的なコンピュータが音響信号処理プログラムを実行することにより図1に示す機能を実現する。
上記のように、本発明の実施の形態によって記載したが、この開示の一部をなす論述および図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例および運用技術が明らかとなる。
10 メモリ
11 焦点データ
12 焦点位置決定部
13 円調和係数変換部
14 フィルタ係数演算部
15 畳み込み演算部
I 入力音響信号
O 出力音響信号
Claims (7)
- 入力音響信号を、仮想音源を実現するための複数のスピーカを並べて構成したスピーカアレイの各スピーカへの出力音響信号に変換する音響信号処理装置であって、
複数の初期焦点座標と、仮想音源の座標および指向性の方向を取得して、
前記複数の初期焦点座標のうち極性の異なる一対の初期焦点座標について、前記仮想音源の座標に基づいて、前記初期焦点座標に前記指向性の方向から特定される回転行列をかけて、焦点座標を決定する焦点位置決定部と、
円調和係数から、前記焦点座標を含む多重極子に与える重みを算出する円調和係数変換部と、
前記スピーカアレイの各スピーカについて、前記焦点座標と、前記焦点座標の極性と、前記多重極子に与える重みから、前記スピーカに与える重み付き駆動関数を演算するフィルタ係数演算部と、
前記スピーカアレイの各スピーカについて、前記入力音響信号に、前記スピーカに対応する重み付き駆動関数を畳み込んで、前記スピーカへの出力音響信号を出力する畳み込み演算部
を備えることを特徴とする音響信号処理装置。 - 前記フィルタ係数演算部は、前記焦点座標のそれぞれを用いて駆動関数を算出し、前記多重極子のそれぞれについて、前記多重極子を構成する各焦点座標の極性と駆動関数から算出した合成駆動関数と、前記多重極子に与える重みから、前記スピーカに与える重み付き駆動関数を演算する
ことを特徴とする請求項1に記載の音響信号処理装置。 - 前記フィルタ係数演算部は、前記多重極子に含まれる各焦点座標について、前記焦点座標の極性と駆動関数をかけた関数を加算して、前記多重極子の前記合成駆動関数を算出する
ことを特徴とする請求項3に記載の音響信号処理装置。 - 前記フィルタ係数演算部は、前記多重極子のそれぞれについて算出した合成駆動関数に、前記多重極子に与える重みをかけて加算して、前記重み付き駆動関数を算出する
ことを特徴とする請求項3に記載の音響信号処理装置。 - 入力音響信号を、仮想音源を実現するための複数のスピーカを並べて構成したスピーカアレイの各スピーカへの出力音響信号に変換する音響信号処理方法であって、
複数の初期焦点座標と、仮想音源の座標および指向性の方向を取得するステップと、
前記複数の初期焦点座標のうち、前記複数の初期焦点座標のうち極性の異なる一対の初期焦点座標について、前記仮想音源の座標に基づいて、前記初期焦点座標に前記指向性の方向から特定される回転行列をかけて、焦点座標を決定するステップと、
円調和係数から、前記焦点座標を含む多重極子に与える重みを算出するステップと、
前記スピーカアレイの各スピーカについて、前記焦点座標と、前記焦点座標の極性と、前記多重極子に与える重みから、前記スピーカに与える重み付き駆動関数を演算するステップと、
前記スピーカアレイの各スピーカについて、前記入力音響信号に、前記スピーカに対応する重み付き駆動関数を畳み込んで、前記スピーカへの出力音響信号を出力するステップ
を備えることを特徴とする音響信号処理方法。 - コンピュータに、請求項1ないし5のいずれか1項に記載の音響信号処理装置として機能させるための音響信号処理プログラム。
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