JP3333440B2 - Outdoor sound field correction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor sound field correction device, and more particularly to an outdoor sound field correction device for correcting sound pressure at an arbitrary position within a loudspeaking range.

[0002]

2. Description of the Related Art Generally, a sound source such as a loudspeaker is arranged outdoors to make a sound louder. At this time, it is necessary to control the sound field generated by the sound within the sound amplification range. As a method of the sound field control, there is a method generally described below.

That is, a plurality of speakers are appropriately arranged so that the sound field within the loudspeaking range is as uniform as possible, and the direction of each speaker is appropriately set. In addition, a mixing console for controlling the amplitude, frequency, and the like of the electric signal before being converted into sound is provided for each speaker. The non-uniformity of the sound field, which cannot be completely corrected, has been corrected by controlling the amplitude, frequency, and the like of the electric signal using a mixing console, so that the sound pressure due to the sound generated from each speaker is corrected.

[0004]

However, in the above-mentioned method, if the arrangement and the direction of the speaker are set,
If an unexpected situation occurs and the sound pressure at a specific point within the loudspeaking range changes significantly, or if it becomes necessary to prevent noise at the specific point, it cannot be dealt with. That is, since the arrangement and orientation of the speaker once set outdoors cannot be changed, the sound pressure had to be corrected by the mixing console.However, the sound pressure at a specific point within the loudspeaking range was corrected by the mixing console. It was not easy to determine such a condition even when trying to correct to a desired sound pressure.

[0005] Therefore, the sound pressure at an arbitrary position within the loudspeaker range cannot be freely corrected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an outdoor sound field correction system capable of freely correcting a sound pressure at an arbitrary position within a loudspeaking range. It is to provide a device.

[0007]

An outdoor sound field correction device according to a first aspect of the present invention has a plurality of sound source units for converting an electric signal into a sound and outputting the sound, and controls each electric signal to control each sound source unit. In the outdoor sound field correction device for correcting a sound field within a sound amplification range, when each desired sound pressure at each sound reception point is set for a plurality of sound reception points within the sound expansion range, each sound source Each corrected sound pressure coefficient which is a sound pressure coefficient for correcting each original sound pressure actually measured at each sound receiving point generated from the section, at each sound receiving point which is a sound pressure multiplied by each of the original sound pressures A calculation unit for determining each corrected sound pressure coefficient, and a correction unit disposed in each sound source unit so that the sound pressure obtained by adding the corrected sound pressures becomes equal to each desired sound pressure at each sound receiving point. Based on each correction coefficient corresponding to the sound pressure coefficient, each correction unit that controls each electric signal, The correction unit controls each electric signal based on each correction coefficient, and each sound source unit generates each corrected sound pressure at each sound receiving point, so that the sound pressure at each sound receiving point within the loudspeaking range is adjusted to each desired sound pressure. The sound pressure is corrected.

According to the first invention, the calculation unit calculates each corrected sound pressure multiplied by each original sound pressure actually measured at each sound receiving point so that the sound pressure at each sound receiving point becomes each desired sound pressure. The coefficients are determined as follows. That is, the respective corrected sound pressure coefficients are determined so that the sound pressure obtained by adding the respective corrected sound pressures at the respective sound receiving points becomes equal to the respective desired sound pressures at the respective sound receiving points.

Then, each sound source unit generates each corrected sound pressure at each sound receiving point by each correction unit controlling the electric signal based on each correction coefficient corresponding to each corrected sound pressure coefficient. Since the sound pressure at each sound receiving point is the sum of the corrected sound pressures at each sound receiving point generated from each sound source section, the sound pressure at each sound receiving point within the loudspeaking range is calculated. Each desired sound pressure can be corrected.

An outdoor sound field correcting apparatus according to a second aspect of the present invention has a plurality of sound source sections for converting an electric signal into a sound and outputting the sound, and controlling each electric signal so as to control the sound of each sound source within a sound range. In the outdoor sound field correction device for correcting a sound field, information of an electric signal of each sound source unit, a three-dimensional distance between each sound receiving point of the plurality of sound receiving points in the sound enhancement range and each sound source unit, , And an original sound pressure at each sound receiving point generated from each sound source unit, using information of an electric signal of each sound source unit input by the input unit and the three-dimensional distance. When determined by simulation, and when each desired sound pressure at each sound receiving point is set, each corrected sound pressure coefficient that is a sound pressure coefficient for correcting each original sound pressure is multiplied by each of the original sound pressures. The sound pressure that is the sum of the corrected sound pressures at each sound receiving point, which is the sound pressure, is A calculation unit that determines each corrected sound pressure coefficient so as to be equal to each desired sound pressure at the sound receiving point, and is disposed in each sound source unit, based on each correction coefficient corresponding to each corrected sound pressure coefficient, Each correction unit controls each electric signal, and each correction unit controls each electric signal based on each correction coefficient, and each sound source unit generates each corrected sound pressure at each sound receiving point. The sound pressure at each sound receiving point within the loudspeaking range is corrected to each desired sound pressure.

According to the second aspect, the calculation is performed by using the information of the electric signal of each sound source unit input by the input unit and the three-dimensional distance between each sound source unit and each sound receiving point. The unit can determine each original sound pressure by simulation. Therefore, it is possible to calculate each original sound pressure when the characteristics such as the frequency of the electric signal of the sound source section are changed or the position of the sound receiving point is changed. As a result, since it is not necessary to actually measure each original sound pressure at each sound receiving point, the predicted value of each original sound pressure can be quickly known. Then, since each correction sound pressure coefficient can be determined by the calculation unit according to each changed original sound pressure, the sound pressure at an arbitrary position within the loudspeaking range can be freely corrected.

An outdoor sound field correction device according to a third invention is the outdoor sound field correction device according to the second invention, wherein the input section includes information on an electric signal of each sound source section, each sound source section and each reception section. It has a receiving unit that receives wireless data including an three-dimensional distance from a sound point and each desired sound pressure at each sound receiving point from an external device.

According to the third aspect, the input section includes information on the electric signal of each sound source section, a three-dimensional distance between each sound source section and each sound receiving point, and each desired sound point at each sound receiving point. A receiving unit that receives wireless data including sound pressure from an external device; For this reason, the data necessary for the calculation unit to calculate the corrected sound pressure coefficient can be transmitted as wireless data even from a place remote from the input unit.

[0014]

Preferred embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 (1) Configuration of Outdoor Sound Field Correction Device FIGS. 1 and 2 are block diagrams showing the configuration of the outdoor sound field correction device according to the first embodiment. The outdoor sound field correction device includes a sound input unit 2 for inputting sound and converting it into an electric signal, a mixing console 4 for controlling the amplitude and frequency of the electric signal to predetermined characteristics, and each terminal Ai (i is 1 to 1). N), each of which has a terminal Bi. . 6c and 6d (hereinafter, referred to as respective patch cords 6i).

The outdoor sound field correction device is provided with each patch cord 6i.
And n amplifiers 8a, 8b,. .
8c, 8d (hereinafter, referred to as respective amplifiers 8i), and n sound source units 10a, 10b,. . 10
c, 10d (hereinafter referred to as each sound source unit 10i).

On the other hand, the outdoor sound field correction apparatus according to the present embodiment has an input section 22 for inputting an actually measured sound pressure which is a sound pressure actually measured at each sound receiving point within the loudspeaking range. In the input unit 22, the operator inputs information (frequency, amplitude, phase, etc.) of the electric signal before being converted into a sound by each of the sound sources 10 i, the sound sources 10 i, and the sound of these sound sources 10 i. A respective respective three-dimensional distance between each sound receiving point in the range, a respective desired sound pressure at each sound receiving point,
Can also be entered.

Here, the three-dimensional distance means a two-dimensional distance (distance on the ground), a height (height from the ground), and an angle (a predetermined distance) from a predetermined point to another predetermined point. The distance information takes into account the difference between the angle of the point and the angle of the other point, where the angle is an angle as viewed from a certain reference point as described later. In the manner of inputting each of the three-dimensional distances described above, first, position information of each sound source unit and position information at each sound receiving point are input to the input unit 22. At this time, the position information is a two-dimensional distance from a predetermined reference point,
Shows height and angle. Then, based on the position information of each sound source unit 10i and the position information at each sound receiving point, each sound source unit 1
Each respective three-dimensional distance between 0i and each receiving point is
It is calculated by a calculation unit described later. In the present embodiment,
To input the position information of each sound source unit 10i and the position information at each sound receiving point to the input unit 22 is to input each three-dimensional distance between each sound source unit 10i and each sound receiving point. .

Then, the outdoor sound field correction device includes the input unit 22
Each corrected sound pressure coefficient, which is a sound pressure coefficient for correcting the actually measured sound pressure (hereinafter, referred to as each original sound pressure) input to, is determined as follows. That is, the sound pressure obtained by adding each corrected sound pressure at each sound receiving point, which is a sound pressure obtained by multiplying each original sound pressure by each corrected sound pressure coefficient, is added to each desired sound pressure at each sound receiving point. The respective corrected sound pressure coefficients are determined so as to be equal. Further, the calculation unit 24 determines each correction coefficient corresponding to each correction sound pressure coefficient.

The calculation section 24 can also determine each of the above-mentioned original sound pressures by simulation. That is,
The calculation unit 24 simulates each sound source by using the information of the electric signal input to the input unit 22 (hereinafter, this information is referred to as the information of the electric signal of each sound source unit) and each of the three-dimensional distances. The unit 10i determines each sound pressure generated at each sound receiving point.

The calculation unit 24 calculates the corrected sound pressure coefficients, which are sound pressure coefficients for correcting each original sound pressure (determined by simulation) at each sound receiving point generated from each sound source unit 10i, as described above. Can be determined as you did. That is, in the same manner as the method of determining each corrected sound pressure coefficient for correcting each actually measured original sound pressure, it is possible to determine each corrected sound pressure coefficient for correcting each original sound pressure by simulation.

Further, the outdoor sound field correction device has a control unit 28 which takes in each correction coefficient calculated by the calculation unit 24 via the I / O port 26 and sends it to each correction unit described later.

Further, the outdoor sound field correction device has each correction unit which can be connected between both terminals of each patch cord 6i and controls an electric signal. As shown in FIG. 2, each correction unit 12a, 12b,. . Each of the A / D converters 14a, 14c converts an electric signal, which is an analog signal input from each terminal Ai of each patch cord, into a digital signal.
b,. . 14c (14b,... 14c are not shown, hereinafter referred to as respective A / D converters 14i), and respective DSPs 16a, 16b, which perform arithmetic processing (filter processing) on the digital signal based on respective correction coefficients. . . 16c (16
b,. . 16c are not shown, and are hereinafter referred to as respective DSPs 16i) and memories 18a, 18b,... Connected to the respective DSPs 16i for storing digital signals to be processed and for storing arithmetic instructions for instructing the arithmetic processing. . 18c
(18b,... 18c are not shown.
i), and the D / A converters 20a, 20b,... which convert the digital signals processed by the DSPs 16i into electric signals as analog signals and output the electric signals to the terminals Bi of the patch cords. . 20c (20b,... 20c are not shown, and are hereinafter referred to as respective D / A converters 20i).

The control unit 28 controls the display unit 30 and the operation unit 32. The operation unit 32 is for the operator to perform various operations. The operator can perform, for example, an on / off operation of each correction unit 12a and each patch code 6a by using the operation unit 32. The display unit 30 displays guidance for various settings and the like.

In the present embodiment, the control condition of the mixing console 4 and the amplification factor of each amplifier 8i are set to predetermined fixed conditions. Further, each of the sound source units 10i may be configured by, for example, one sound source unit (speaker), or may be configured by a speaker cluster including a plurality of speakers.

(2) Operation of Outdoor Sound Field Correction Apparatus The operation of the outdoor sound field correction apparatus according to the first embodiment will be described.
(A) The operation when the control of the electric signal is not performed by each correction unit 12i, and (B) After determining each correction coefficient when controlling the electric signal by each correction unit 12i, each correction unit 1
2i, the operation of controlling the electric signal based on each correction coefficient to generate each corrected sound pressure from each sound source unit 10i will be described separately.

(A) Operation when electric signal is not controlled by each correction unit 12i When electric signal is not controlled by each correction unit 12i,
First, the operation unit 32 is operated to turn off the connection between both terminals of each patch cord 6i and each correction unit 12i. As a result, the control unit 28 controls each terminal A of each patch cord 6i.
i and Bi are connected.

When a voice is input to the voice input unit 2 such as a microphone, the voice is converted into an electric signal. As a method for inputting the voice, a voice may be directly input,
Alternatively, audio by CD, MD, cassette tape, or the like may be input.

The electric signal is controlled by the mixing console 4. At this time, the frequency of the electric signal,
The amplitude, phase and the like are controlled to predetermined characteristics.

The electric signal controlled by the mixing console 4 is amplified by each amplifier 8i, and the electric signal is converted into a sound by each sound source unit 10i.
Sound pressure is generated from i. Thereby, for example, it is possible to control the sound field of the sound of each sound source unit 10i within the loudspeaking range to a predetermined characteristic.

(B) After determining each correction coefficient when controlling the electric signal by each correction unit 12i, each correction unit 12i
In i, the operation of controlling the electric signal based on each correction coefficient to generate each corrected sound pressure from each sound source unit The sound pressure at each sound receiving point within the sound amplification range of the sound of each sound source unit 10i is set to a desired value. In order to achieve the above sound pressure, it is necessary to determine each correction coefficient required for each DSP 16i to perform arithmetic processing when controlling each electric signal by each correction unit 12i. Regarding this method, there are the following two methods. That is,
There are a method of determining each corrected sound pressure coefficient and each correction coefficient from each actually measured original sound pressure, and a method of determining each corrected sound pressure coefficient and each correction coefficient from each original sound pressure determined by simulation.

(B-1) A method of determining each corrected sound pressure coefficient and each correction coefficient from each actually measured original sound pressure will be described below with reference to a flowchart shown in FIG.

First, in step S102, each original sound pressure (amplitude, frequency, phase) at each sound receiving point is measured. In this measurement, n sound source units 10i (i = a to
Each original sound pressure Cki + jDki at each of m sound receiving points Pk (k = 1 to m) generated from d) is measured. Note that C
ki and Dki are coefficients and include information such as frequency, amplitude, and phase. In the above measurement, when measuring the original sound pressure C11 + jD11 at the sound receiving point P1 generated from the sound source unit 10a, the sound pressure from another sound source unit is prevented from being generated at the sound receiving point P1. FIG. 4A shows m sound receiving points P generated from n sound sources 10i in the present embodiment.
1,. . , Pm is a schematic diagram showing the original sound pressure. In addition,
In FIG. 4A, the mixing console 4, each amplifier 8i, the audio input unit 2, and each patch cord 6i are omitted.

Then, as shown in FIG. 4A, the measured original sound pressure generated at the sound receiving point P1 from the sound source section 10a is calculated as C1
1 + jD11. Similarly, the actually measured original sound pressure generated at the sound receiving point P1 from the sound source unit 10b is C12 + jD1
It can be expressed as 2. Similarly, the sound receiving points P
The actual sound pressure measured at 1 is C1i + jD1
i,. . . The actual measured original sound pressure generated at the sound receiving point P1 from the sound source unit 10d can be expressed as C1n + jD1n. The measured original sound pressure generated at the sound receiving point P2 from the sound source unit 10a is:
C21 + jD21. . . . . Sound receiving point P from sound source unit 10d
The original sound pressure generated in m can be expressed as Cmn + jDmn.

Next, in step S104, the display unit 30
An instruction for inputting each desired sound pressure at each sound receiving point Pk to the input unit 22 is displayed, and the input unit 22 determines each desired sound pressure (frequency, amplitude, phase) at each sound receiving point Pk. input.

Then, in step S106, the calculation unit 2
4 calculates each corrected sound pressure coefficient from each original sound pressure and each desired sound pressure. Then, the calculation unit 24 converts each corrected sound pressure coefficient into each correction coefficient.

(B-1-2) Calculation method of each corrected sound pressure coefficient and each correction coefficient The calculation method of each corrected sound pressure coefficient and each correction coefficient in step S106 will be described in detail below.

FIG. 4B shows that the electric signal in the present embodiment is supplied to the n sound source units 10 via the n correction units 12i.
FIG. 9 is a schematic diagram illustrating a method for deriving sound pressures at m sound receiving points Pk generated from i. In FIG. 4B, FIG.
The difference from (a) is that the electric signal adjusted by the mixing console 4 is controlled by each correction unit 12i and then converted into sound by each sound source unit 10i. At this time, each correction coefficient of each correction unit 12i is determined such that the sound pressure at each sound receiving point Pk becomes each desired sound pressure Ak + jBk input by the input unit 22. That is, each sound receiving point P
k, each corrected sound pressure (Cki + jDki) multiplied by each corrected sound pressure coefficient Xi + jYi.
+ JDki) * (Xi + jYi) so that the sum of the respective desired sound pressures is Ak + jBk. To summarize this relationship, the following mathematical expression is obtained.

[0039]

(Equation 1) From the above equations, m equations at each sound receiving point Pk are generated. For example, the equation of the sound receiving point P1 is: A1 + jB1 = (C11 + jD11) * (X1 + jY
1) + (C12 + jD12) * (X2 + jY2)
+. . . + (C1n + jD1n) * (Xn + jYn), and the equation of the sound receiving point P2 is: A2 + jB1 = (C11 + jD11) * (X1 + jY
1) + (C12 + jD12) * (X2 + jY2)
+. . . + (C1n + jD1n) * (Xn + jYn).

Similarly, the sound receiving points P3, P4. . An equation is also established for Pm. At this time, if the number m of sound receiving points is smaller than the number n of sound sources, the equation cannot be solved. Therefore, the number of sound receiving point conditions needs to be given to the number of sound source units or more.

Then, Ak, Bk (k = 1 to m), Ck
Since i and Dki (k = 1 to m, i = 1 to n) are known,
Solving the system of simultaneous linear equations, each corrected sound pressure coefficient Xi, Y
i (i = 1 to n) is obtained.

The calculation unit 24 calculates each corrected sound pressure coefficient X
For i and Yi (i = 1 to n), each correction coefficient is determined in consideration of the sound pressure / electric signal conversion characteristics of each sound source unit 10i.

Subsequently, in step S110, the display unit 3
0 indicates whether or not to draw the sound pressure Ak + jBk of each sound receiving point Pk.

When the sound pressure of each sound receiving point Pk is drawn, an operation to that effect is performed by the operation unit 32 in step S112, and the sound pressure of each sound receiving point Pk is drawn on the display unit 30. . At this time, when the sound pressure at each sound receiving point Pk has a frequency component of 2 or more, the calculation unit 24 inputs the frequency to be drawn into the input unit 22 so that the calculating unit 24 calculates the sound pressure of each sound receiving point Pk. The sound pressure of the frequency component is calculated. The control unit 28 receives these sound pressures from the calculation unit 24 and sends them to the display unit 30. Then, the control unit 28 causes the display unit 30 to draw the frequency component of the sound pressure at each sound receiving point Pk. Then, control goes to a step S114.

On the other hand, when the sound pressure at each sound receiving point Pk is not drawn, the flow shifts to step S114.

Finally, in step S114, the control unit 2
8 sends each correction coefficient calculated by the calculation unit 24 to each DSP 16i of each correction unit 12i. Accordingly, each correction unit 12i controls the electric signal input from the terminal Ai based on each correction coefficient, and converts each corrected sound pressure (Cki + jDki) (Xi + jYi) from each sound source unit 10i to each sound receiving point P
k is set to a state that can occur.

(B-2) A method of determining each corrected sound pressure coefficient and each correction coefficient from each original sound pressure coefficient determined by the simulation will be described below with reference to a flowchart shown in FIG.

First, in step S202, the input unit 22
The information of the electric signal of each sound source unit 10i and the information of each sound source unit 10i
And each respective three-dimensional distance between the sound and each sound receiving point Pk;
Enter

Next, in Step S204, Step S
A simulation is performed by the calculation unit 24 using the data input at 202, and each original sound pressure Cki + jDki at each sound receiving point Pk generated from each sound source unit 10i is calculated. Then, the calculator 24 calculates the sum of the respective original sound pressures generated from the respective sound sources 10i at the respective sound receiving points Pk.

(B-2-1) Calculation Method of Each Original Sound Pressure and Calculation Method of Sum of Each Original Sound Pressure at Each Receiving Point Each original sound pressure Cki + jDk in step S204
The method of calculating i and the method of calculating the sum of the original sound pressures at each sound receiving point Pk will be described below in detail with reference to FIG.

In FIG. 4A, each original sound pressure generated at each sound receiving point Pk from each sound source unit 10i is determined as follows. That is, the information of the electric signal of each sound source unit 10i input by the input unit 22 and the three-dimensional distance are input to the calculation unit 24. The calculation unit 24 determines each original sound pressure by simulation using these data. In this simulation, the information of the electric signal of each sound source unit 10i and the distance between each sound source unit 10i and each sound receiving point Pi are calculated.
Each original sound pressure can be obtained by solving a combination of the dimensional distance, the electric signal / sound pressure conversion equation of each sound source unit 10i, and the wave equation of the sound pressure generated from each sound source unit 10i.

For example, as shown in FIG. 4A, when obtaining the original sound pressure generated at the sound receiving point P1 from the sound source section 10a, the following is performed. That is, the original sound pressure is equal to the sound source unit 10a.
Information of the electric signal before being converted into voice by the
a and a three-dimensional distance between the sound receiving point P1 and the electric signal / sound pressure conversion equation of the sound source unit 10a, and the sound source unit 10a
And a wave equation of the sound pressure generated from the combination. And the sound source unit 10a
From the sound receiving point P1 is C11 + jD11
Can be expressed as

Similarly, the sound receiving point P1
The sound pressure generated in the sound source unit 10b is calculated by using the information of the electric signal before being converted into sound by the sound source unit 10b and the three-dimensional distance between the sound source unit 10b and the sound receiving point P1. It is obtained by a simulation combining the signal / sound pressure conversion equation and the wave equation of the sound pressure generated from the sound source unit 1ba, and can be expressed as C12 + jD12. Similarly, the original sound pressure generated at each sound receiving point P1 from each sound source unit 10i is C1
i + jD1i,. . . The original sound pressure generated at the sound receiving point P1 from the sound source unit 10d is C1n + jD1n (C1n, D1n
Is a coefficient). Then, the sound receiving point P from the sound source unit 10a
2 is C21 + jD21 (C21, D21
21 is a coefficient). . . . . The original sound pressure generated at the sound receiving point Pm from the sound source unit 10d is Cmn + jDmn (Cmn, Dmn
Is a coefficient). The sound pressure Ek + jFk at each sound receiving point Pk is represented by the sum of the original sound pressures of the sound sources 10i. The expression of the sound pressure at each sound receiving point Pk is shown in the following expression.

[0054]

(Equation 2) For example, the sound pressure E1 + jF1 of the sound receiving point P1 is C11 + C
12+. . . + C1n + j (D11 + D12 + ... +
D1n).

Subsequently, in step S206, the display unit 3
0, the sound pressure Ek of each sound receiving point Pk obtained as described above.
+ JFk (sound pressure at each sound receiving point Pk before correction by each correction unit) is displayed.

When the sound pressure at each sound receiving point Pk is drawn, an operation to that effect is performed by the operation unit 32 in step S207, and the sound receiving point P before correction is displayed on the display unit 30.
The sound pressure of k is drawn. At this time, if the sound pressure at each sound receiving point Pk has a frequency component of 2 or more, the input unit 22 inputs the frequency to be drawn, and
Calculates the sound pressure of the frequency component for the sound pressure at each sound receiving point Pk. The control unit 28 receives these sound pressures from the calculation unit 24 and sends them to the display unit 30. Then, the control unit 28
Causes the display unit 30 to draw the frequency component of the sound pressure at each sound receiving point Pk. Then, control goes to a step S208.

On the other hand, when the sound pressure at each sound receiving point Pk is not drawn, the flow shifts to step S208.

In step S208, the display unit 3
At 0, an instruction to input each desired sound pressure at each sound receiving point Pk to the input unit 22 is displayed.
Input each desired sound pressure in the.

Then, in step S210, the calculation unit 2
4 calculates each corrected sound pressure coefficient from each original sound pressure and each desired sound pressure. Then, the calculation unit 24 converts each corrected sound pressure coefficient into each correction coefficient.

The method of calculating each correction sound pressure coefficient and each correction coefficient in step S210 is described above in (B-1-
This is the same as the method shown in 2).

Subsequently, in step S214, the display unit 3
0 indicates whether or not to draw the sound pressure Ak + jBk of each sound receiving point Pk.

When the sound pressure of each sound receiving point Pk is drawn, an operation to that effect is performed by the operation unit 32 in step S215, and the sound pressure of each sound receiving point Pk is drawn on the display unit 30. . At this time, when the sound pressure at each sound receiving point Pk has a frequency component of 2 or more, the calculation unit 24 inputs the frequency to be drawn into the input unit 22 so that the calculating unit 24 calculates the sound pressure of each sound receiving point Pk. The sound pressure of the frequency component is calculated. The control unit 28 receives these sound pressures from the calculation unit 24 and sends them to the display unit 30. Then, the control unit 28 causes the display unit 30 to draw the frequency component of the sound pressure at each sound receiving point Pk. Then, control goes to a step S216.

On the other hand, when the sound pressure at each sound receiving point Pk is not drawn, the flow shifts to step S216.

Finally, in step S216, control unit 2
8 sends each correction coefficient calculated by the calculation unit 24 to each DSP 16i of each correction unit 12i. Accordingly, each correction unit 12i controls the electric signal input from the terminal Ai based on each correction coefficient, and converts each corrected sound pressure (Cki + jDki) (Xi + jYi) from each sound source unit 10i to each sound receiving point P
k is set to a state that can occur.

Based on each correction coefficient calculated by the method of (B-1) or (B-2), each correction unit 12i controls an electric signal and each correction sound pressure (Cki) from each sound source unit 10i.
+ JDki) (Xi + jYi) will be described below.

First, each patch cord 6 is
An operation is performed to turn on the connection between both terminals of i and each of the correction units 12i. As a result, the control unit 28 controls each terminal A
i is connected to the input side of each AD converter 14i.
i is connected to the output side of each DA converter 20i.

When voice is input to the voice input unit 2, the voice is converted into an electric signal. Then, the electric signal controlled by the mixing console 4 is input to each correction unit 12i. Then, in each correction unit 12i, each AD conversion unit 14i converts an electric signal, which is an analog signal, into a digital signal. And each DSP16
i is based on each correction coefficient for the digital signal,
Perform arithmetic processing (filter processing).

At this time, each DSP 16i temporarily stores the digital signal in each memory 18i, and reads out an operation instruction for instructing an arithmetic processing from each memory 18i. After each DSP 16i is set to perform a predetermined operation based on the operation command and each correction coefficient, the DSP 16i reads a digital signal from each memory 18i, performs an operation, and outputs the digital signal to each DA converter 20i. . Each DA converter 20i converts the digital signal subjected to the arithmetic processing into an electric signal which is an analog signal and outputs the electric signal to each terminal Bi. Electrical signals are sent to each amplifier 8
i, and the electric signal is converted into sound by each sound source unit 10i. Then, each sound source unit 10i receives each sound receiving point Pk
To generate each corrected sound pressure (Cki + jDki) (Xi + jYi). This makes it possible to correct the sound pressure at each sound receiving point Pk within the loudspeaking range to each desired sound pressure Ak + jBk.

In the present embodiment, the calculation unit 24
Each original sound pressure Cki + j actually measured at each sound receiving point Pk such that the sound pressure at each sound receiving point Pk becomes each desired sound pressure Ak + jBk.
Each corrected sound pressure coefficient Xi + jYi by which Dki is multiplied is determined as follows. That is, the sound pressure obtained by adding the corrected sound pressures (Cki + jDki) (Xi + jYi) at each sound receiving point Pk is the desired sound pressure A at each sound receiving point Pk.
k + jBk so that each corrected sound pressure coefficient Xi + j becomes equal to k + jBk.
Yi is determined.

Then, each correction unit 12i controls the electric signal based on each correction coefficient corresponding to each correction sound pressure coefficient Xi + jYi, so that each sound source unit 10i converts each correction sound pressure (Cki + jDki) (Xi + jYi) into each correction sound pressure coefficient Xi + jYi. Receiving point Pk
Occurs. The sound pressure at each sound receiving point Pk is calculated based on each corrected sound pressure (C) at each sound receiving point Pk generated from each sound source unit 10i.
ki + jDki) (Xi + jYi) plus the sound pressure (ie, add 1 to n for subscript i)
Therefore, the sound pressure at each sound receiving point Pk within the loudspeaking range can be corrected to each desired sound pressure Ak + jBk.

The calculation unit 24 uses the information of the electric signal of each sound source unit 10i input from the input unit 22 and the three-dimensional distance between each sound source unit 10i and each sound receiving point Pk.
Can determine each original sound pressure Cki + jDki by simulation. For this reason, the characteristics such as the frequency of the electric signal of each sound source unit 10i may be changed, or each sound receiving point P
Even if the position of k is changed, each original sound pressure Cki + jDki can be calculated. As a result, since it is not necessary to actually measure each original sound pressure at each sound receiving point Pk, the predicted value of each original sound pressure can be quickly known. Then, the calculation unit 24 can determine each corrected sound pressure coefficient Xi + jYi according to each of the changed original sound pressures Cki + jDki, and can freely correct the sound pressure at an arbitrary position within the loudspeaking range.

A specific example of correcting the sound field in the stadium 40 in a certain area shown in FIG. 6A using the outdoor sound field correction device shown in FIGS. 1 and 2 will be described below. FIG. 6B is an enlarged schematic view of the stadium 40.

As shown in FIG. 6B, a case where the outdoor sound field correction device of the present embodiment is installed at the position of the SPA will be described. In this specific example, each original sound pressure is determined by simulation.

(Specific Example 1) Sound pressures generated at a plurality of sound receiving points (including the X point) at a two-dimensional distance of 100 m and a height of 1.5 m from the ground centering on the position of the SPA. In contrast, each correction unit 12i
, The sound pressure at each sound receiving point Pk when control is not performed is drawn. The result is shown in FIG. Then, the sound pressure at each sound receiving point Pk when the control is performed by each correction unit 12i is drawn. The result is shown in FIG. 7 and 8, where f is a frequency, r is a two-dimensional distance from the SPA, h
Is the height of each sound receiving point from the ground. 7 and 8
In FIG. 6B, the angle axis in the circumferential direction indicates the clockwise angle of each sound receiving point Pk when the direction of the arrow α is 0 °, and the axis in the radial direction will be described later. The sound pressure level (dB) is shown.

Similarly, the sound pressure at each sound receiving point Pk when the control unit 12i does not control the component of the frequency of 500 Hz is drawn. The result is shown in FIG. Each sound receiving point P when the control is performed by each correction unit 12i.
The sound pressure at k was drawn. The result is shown in FIG.

The sound pressure in the drawing is a sound pressure level, and is represented by the following equation.

Sound pressure level SPL = 20 * log ₁₀ (PP
/ P0) (dB) where P0 is a reference sound pressure value and is 20 (μPa). PP is an effective value of sound pressure.

(Specific Example 2) The sound pressure generated at each of a plurality of sound receiving points Pk (including the Y point) at a height of 20 m from the ground at a two-dimensional distance of 200 m from the position of the SPA. In contrast, each correction unit 1
The sound pressure at each sound receiving point Pk when control is not performed in 2i is drawn. The result is shown in FIG. Then, each correction unit 1
The sound pressure at each sound receiving point Pk when the control is performed in 2i is drawn. In this case, noise reduction was corrected for a building located at a position near 80 ° to the left from the front as viewed from the SPA. The results are shown in FIGS. In FIGS. 12 and 13, the degree of noise reduction correction is changed.

Similarly, the sound pressure at each sound receiving point Pk when the control at each correction unit 12i is not performed for the component having a frequency of 500 Hz is drawn. The result is shown in FIG. And
The sound pressure at each sound receiving point Pk when the control is performed by each correction unit 12i is drawn. Also in this case, the noise reduction was corrected for the building located at a position 80 ° to the left from the front as viewed from the SPA. The result is shown in FIG.

The above result is determined in step S20.
7, the simulation result data drawn in S215, but actual measurement data obtained by operating the outdoor sound field correction device in the above-mentioned stadium 40 without turning on each correction unit 12i, and each sound receiving point by each original sound pressure. The characteristic part was similar to the drawing of the sound pressure at Pk (that is, the simulation result data). Therefore, the measurement data obtained by operating the outdoor sound field correction device in the stadium 40 by turning on each correction unit 12i and the drawing of the sound pressure at each sound receiving point Pk based on each correction sound pressure are similar. You can think that there is.

Further, for example, the sound field is made uniform within 100 m from the outdoor sound field correction device SPA, and 200 m at 80 ° from the front to the left as viewed from the correction device.
It can also reduce sound pressure at distant points. For this reason, it is possible to uniformly control the sound field in the specific region within the sound amplification range, and at the same time, to reduce the sound pressure in a predetermined area outside the specific range for noise reduction.

Embodiment 2 The difference between the present embodiment and the outdoor sound field correction device of the first embodiment is that the input unit 2
2 includes information on the electric signal of each sound source unit 10i, each three-dimensional distance between each sound source unit 10i and each sound receiving point Pk, and each desired sound pressure Ak + jBk at each sound receiving point Pk. And the operation unit 32 is provided with a command receiving unit for receiving each operation command for instructing each operation from the external device. It is in.

In the present embodiment, first, the input unit 22 receives the wireless data transmitted from the external device and calculates each original sound pressure Cki + jDki. And the calculation unit 24
Are the original sound pressures Cki + jDki and the desired sound pressures Ak +
Each correction coefficient is calculated from jBk in the same manner as in the first embodiment.

Then, an operation command is transmitted from an external device so as to turn on the connection between both terminals of each patch cord 6i and each correction unit 12i, and after the command reception unit of the operation unit 32 receives the command, the operation unit 32 Sends this to the control unit 28. As a result, the control unit 28 connects each terminal Ai to each AD conversion unit 14
i, and each terminal Bi is connected to each DA converter 20.
Connect to the input side of i. Then, when an operation command indicating that each correction coefficient is to be sent to each correction unit 12i is transmitted from the external device, the operation unit 32 receives the operation command through the command reception unit. Then, the operation unit 32 sends a message to that effect to the control unit 28. As a result, the control unit 28 sets each correction coefficient to each correction unit 1.
2i, and each DSP 16i is set to perform arithmetic processing based on each correction coefficient.

In the present embodiment, when wireless data is transmitted from the external device to the input unit 22, the input unit 22 outputs information on electric signals, the three-dimensional distance between each sound source unit 10i and each sound receiving point Pk, Each desired sound pressure Ak + jBk is input. And
The calculation unit 24 calculates each correction coefficient. Therefore, there is no need to perform work near the input unit 22 or the calculation unit 24. Further, since the operation by the operation unit 32 can be performed wirelessly, the operation can be performed at a place remote from the operation unit 32. Therefore, it is not necessary to set each correction unit 12i of the outdoor sound field correction device near the outdoor sound field correction device, and it is possible to perform the setting even at a place remote from the outdoor sound field correction device.

It is also preferable to transmit wireless data including each original sound pressure and each desired sound pressure Ak + jBk actually measured at each sound receiving point Pk from each sound receiving point Pk to the outdoor sound field correction device. As a result, in the calculation unit 24 of the outdoor sound field correction device,
Each corrected sound pressure coefficient and each correction coefficient are determined based on each measured original sound pressure.

Embodiment 3 In the present embodiment, the input unit 22 and the calculation unit 24 according to the first embodiment are combined into one personal computer, and a telephone line is connected to this personal computer.

In the present embodiment, the information of the electric signal of each sound source unit 10i transmitted via the telephone line by operating the personal computer, and each of the three signals between each sound source unit 10i and each sound receiving point Pk. It is possible to know the dimensional distance and each desired sound pressure Ak + jBk at each sound receiving point Pk. Then, if the above data is input to the personal computer, the personal computer
In addition to calculating ki + jDki, each correction coefficient is calculated.

In the present embodiment, information on the electric signal of each sound source unit 10i, each three-dimensional distance between each sound source unit 10i and each sound receiving point Pk, and each desired signal at each sound receiving point Pk. Sound pressure Ak
+ JBk can be sent over the telephone line. For this reason, for example, when a plurality of outdoor sound field correction devices are used, one center can manage the data for each outdoor sound field correction device and quickly send the data to each outdoor sound field correction device as needed. it can.

It is preferable that the data transmitted by the telephone line include each original sound pressure actually measured at each sound receiving point Pk and each desired sound pressure Ak + jBk. As a result, the calculation unit 24 of the outdoor sound field correction device determines each correction sound pressure coefficient and each correction coefficient based on each measured original sound pressure.

[0091]

As described above, according to the first aspect of the present invention, the calculation unit calculates the sound pressure at each sound receiving point so that the sound pressure at each sound receiving point becomes each desired sound pressure. Each corrected sound pressure coefficient to be multiplied by each actually measured original sound pressure is determined as follows. That is,
Each corrected sound pressure coefficient is determined such that the sound pressure obtained by adding the corrected sound pressures at each sound receiving point is equal to the desired sound pressure at each sound receiving point.

Then, each sound source section generates each corrected sound pressure at each sound receiving point by controlling each electric signal based on each correction coefficient corresponding to each corrected sound pressure coefficient. Since the sound pressure at each sound receiving point is the sum of the corrected sound pressures at each sound receiving point generated from each sound source section, the sound pressure at each sound receiving point within the loudspeaking range is calculated. Each desired sound pressure can be corrected.

According to the second aspect of the present invention, the information of the electric signal of each sound source section input by the input section and the three-dimensional distance between each sound source section and each sound receiving point are used. Thus, the calculation unit can determine each original sound pressure by simulation. Therefore, it is possible to calculate each original sound pressure when the characteristics such as the frequency of the electric signal of the sound source section are changed or the position of the sound receiving point is changed. As a result, since it is not necessary to actually measure each original sound pressure at each sound receiving point, the predicted value of each original sound pressure can be quickly known. Then, since each correction sound pressure coefficient can be determined by the calculation unit according to each changed original sound pressure, the sound pressure at an arbitrary position within the loudspeaking range can be freely corrected.

According to the third aspect of the present invention, the input section includes information on the electric signal of each sound source section, a three-dimensional distance between each sound source section and each sound receiving point, and information on each sound receiving point. A receiving unit that receives wireless data including each desired sound pressure from an external device; For this reason, the data necessary for the calculation unit to calculate the corrected sound pressure coefficient can be transmitted as wireless data even from a place remote from the input unit.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an outdoor sound field correction device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of the outdoor sound field correction device according to the first embodiment.

FIG. 3 is a flowchart illustrating a method of calculating each correction coefficient according to the first embodiment;

FIG. 4A is a schematic diagram showing each original sound pressure at each sound receiving point generated from each sound source unit according to the first embodiment,
FIG. 3B is a schematic diagram for explaining a method of calculating each corrected sound pressure coefficient according to the first embodiment.

FIG. 5 is a flowchart illustrating a method for calculating each correction coefficient according to the first embodiment;

6A is a diagram showing a stadium in a certain area, and FIG. 6B is a diagram showing a stadium where an outdoor sound field correction device is arranged so as to correct the sound pressure at a specific point. FIG.

FIG. 7 is a diagram showing a sound pressure at each sound receiving point before correction.

FIG. 8 is a diagram showing sound pressure at each sound receiving point after correction.

FIG. 9 is a diagram showing sound pressure at each sound receiving point before correction.

FIG. 10 is a diagram showing sound pressure at each sound receiving point after correction.

FIG. 11 is a diagram showing a sound pressure at each sound receiving point before correction.

FIG. 12 is a diagram showing sound pressure at each sound receiving point after correction.

FIG. 13 is a diagram showing sound pressure at each sound receiving point after correction.

FIG. 14 is a diagram showing sound pressure at each sound receiving point before correction.

FIG. 15 is a diagram showing sound pressure at each sound receiving point after correction.

[Description of Signs] 2 audio input unit, 4 mixing console, 6a, 6
b, 6c, 6d patch cord, 8a, 8b, 8c, 8
d amplifier, 10a, 10b, 10c, 10d sound source section,
12a, 12b, 12c correction unit, 14a A / D conversion unit, 16a DSP, 18a memory, 20a D / A conversion unit, 22 input unit, 24 calculation unit, 26 I / O port, 28 control unit, 30 display unit, 32 Operation unit, 40
Stadium.

Claims (3)

(57) [Claims] 1. An outdoor sound field correction device comprising: a plurality of sound source units for converting an electric signal into a sound and outputting the sound; and controlling each electric signal to correct a sound field within a sound amplification range of the sound of each sound source unit. When a desired sound pressure at each sound receiving point is set for a plurality of sound receiving points within the loudspeaking range, each original sound pressure actually measured at each sound receiving point generated from each sound source unit is corrected. The sound pressure obtained by adding each corrected sound pressure at each sound receiving point, which is a sound pressure obtained by multiplying each corrected sound pressure coefficient that is a sound pressure coefficient for each of the original sound pressures, at each sound receiving point. A calculating unit that determines each corrected sound pressure coefficient so as to be equal to each desired sound pressure of the sound source unit, and based on each correction coefficient corresponding to each corrected sound pressure coefficient, Each correction unit to be controlled;
Each correction unit controls each electric signal based on each correction coefficient, and each sound source unit generates each corrected sound pressure at each sound receiving point, so that the sound at each sound receiving point within the loudspeaking range is An outdoor sound field correction device wherein the pressure is corrected to each desired sound pressure. 2. An outdoor sound field correcting apparatus comprising: a plurality of sound source units for converting an electric signal into a sound and outputting the sound; and controlling each electric signal to correct a sound field within a sound amplification range of the sound of each sound source unit. Information of the electrical signal of each sound source unit, a three-dimensional distance between each sound receiving point of each of the plurality of sound receiving points in the loudspeaker range and each sound source unit,
Input unit, and simulates each original sound pressure at each sound receiving point generated from each sound source unit using the information of the electric signal of each sound source unit input by the input unit and the three-dimensional distance. And when each desired sound pressure at each sound receiving point is set, a sound obtained by multiplying each original sound pressure by each corrected sound pressure coefficient, which is a sound pressure coefficient for correcting each original sound pressure. A calculating unit that determines each corrected sound pressure coefficient so that the sound pressure obtained by adding each corrected sound pressure at each sound receiving point that is the pressure is equal to each desired sound pressure at each sound receiving point. A correction unit disposed in each sound source unit and controlling each electric signal based on each correction coefficient corresponding to each correction sound pressure coefficient,
Each correction unit controls each electric signal based on each correction coefficient, and each sound source unit generates each corrected sound pressure at each sound receiving point, so that the sound at each sound receiving point within the loudspeaking range is An outdoor sound field correction device wherein the pressure is corrected to each desired sound pressure. 3. The input unit includes: information of an electric signal of each sound source unit; a three-dimensional distance between each sound source unit and each sound receiving point; each desired sound pressure at each sound receiving point; The outdoor sound field correction device according to claim 2, further comprising: a reception unit that receives wireless data including the following from an external device.