JP5353316B2 - Sound field visualization device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology enabling a user to obtain easily and intuitively a spacial distribution of a physical quantity showing a characteristic of a sound field represented by a sound pressure. <P>SOLUTION: A microphone MC is provided with a position sensor 21, and the position of the microphone MC is detected by the position sensor 21. A control part 11 of this sound field visualizing device 1 specifies a reference position wherein a distance to the detected microphone MC position is in a range determined beforehand, from among a plurality of reference positions arranged beforehand, and displays an image corresponding to a sound pressure of a sound collected by the microphone MC on the specified reference position. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a sound field visualization apparatus.

  In recent years, techniques for measuring the spatial distribution of physical quantities representing the characteristics of a sound field typified by sound pressure have been proposed. For example, Patent Document 1 proposes a technique for detecting a test amount with a sensor that can arbitrarily move in a test field and detecting the coordinates of the sensor with a video camera.

JP 2005-265480 A

By the way, sound field visualization techniques are often used by specialists, and conventional apparatuses generally focus on accuracy. On the other hand, visualization technology can be a powerful aid for non-professionals to understand the sound field. Therefore, it is preferable that the sound field can be visualized more intuitively and easily. However, with conventional devices, it has been difficult for a person who is not an expert to intuitively grasp the sound field.
The present invention has been made in view of the above-described background, and provides a technique that allows a user to easily grasp the spatial distribution of physical quantities representing characteristics of a sound field typified by sound pressure. For the purpose.

In order to solve the above-described problems, the present invention provides a sound collecting means for collecting sound in a predetermined space and outputting a sound signal representing the collected sound, and a position of the sound collecting means in the space. A position detecting unit for detecting, a physical quantity detecting unit for detecting a physical quantity representing a feature of a sound from a sound signal output from the sound collecting unit, and a plurality of reference positions arranged in advance in the space. A reference position specifying means for specifying a reference position whose distance from the position detected by the detecting means is within a predetermined range; and an image in which the size of the physical quantity detected by the physical quantity detecting means is indicated by a display size. Display control means for displaying on the display means, comprising: display control means for displaying the image at a display position corresponding to the reference position specified by the reference position specifying means. Providing Ruotojo visualization device.

  In a preferred aspect of the present invention, referring to the storage content of the storage means for storing the physical quantity detected by the physical quantity detection means and the reference position specified by the reference position specifying means in association with each other, A calculation unit that performs a predetermined calculation on a physical quantity corresponding to each reference position for each of the plurality of reference positions, and the display control unit displays an image representing a calculation result of the calculation unit. You may display on the display position corresponding to the reference | standard position corresponding to a result.

  In a further preferred aspect of the present invention, the sound collecting means is a sound collecting means having sound collecting directivity, the position detecting means detects a position and an attitude of the sound collecting means, and the display control means is Based on the posture detected by the position detecting means, an image representing the sound collecting direction of the sound collecting means may be displayed on the display means.

  According to the present invention, it is easy for a user to intuitively understand the distribution of physical quantities in a sound field.

It is a figure showing roughly an example of composition of a sound field visualization system. It is a figure which shows an example of the memory content of a sound pressure average value data storage area. It is a figure which shows an example of the arrangement | positioning aspect of a reference position. It is a figure which shows an example of a functional structure of a sound field visualization apparatus. It is a figure which shows an example of the screen displayed on a display part. It is a figure which shows an example of the screen displayed on a display part. It is a figure which shows an example of the screen displayed on a display part. It is a figure which shows an example of the screen displayed on a display part.

<A: Configuration>
FIG. 1 is a block diagram showing a configuration of a sound field visualization system 100 according to an embodiment of the present invention. The sound field visualization system 100 is configured by connecting a speaker SP and a microphone device 2 to the sound field visualization device 1 via I / Fs 16 and 17. The sound field visualization device 1 is, for example, a personal computer, and performs sound field measurement processing and measurement result display processing. The speaker SP is a sound emitting unit that emits sound according to a supplied sound signal. Here, the speaker SP emits a predetermined sine wave for measuring the sound field. The microphone device 2 is configured by mounting a position sensor 21 on a microphone MC. The microphone MC is sound collection means for collecting sound in a predetermined space and outputting a sound signal representing the collected sound. Note that the microphone MC may have a directivity for collecting sound or may not have a directivity. The position sensor 21 detects the position of the microphone MC in the space and outputs a signal indicating the detected position. The user measures the sound field in the space by holding the microphone device 2 and moving in the space where the sound field is desired to be measured. As the position sensor 21, for example, the sound field visualization device 1 may be configured to transmit an ultrasonic pulse, and the position sensor 21 may detect the position by receiving the ultrasonic pulse. In addition, for example, the microphone MC may be provided with an LED marker, and the LED marker attached to the microphone may be detected by searching for the maximum value of the luminance by a photographing unit such as a CCD camera. Further, the position of the microphone may be detected using both image processing and the ultrasonic pulse method. Further, the position detection mode is not limited to this, and the point may be any as long as it detects the position in the space of the microphone MC. The detection signal output from the position sensor 21 is supplied to the sound field visualization device 1 via the I / F 17.

  Next, the configuration of the sound field visualization device 1 will be described with reference to FIG. In the figure, the control unit 11 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory), and reads and executes a computer program stored in the ROM or the storage unit 12. The respective parts of the sound field visualization device 1 are controlled via the bus. The storage unit 12 is a storage unit for storing a computer program executed by the control unit 11 and data used at the time of execution, and is, for example, a hard disk device. The display unit 13 includes a liquid crystal panel and displays various images under the control of the control unit 11. The operation unit 14 outputs a signal corresponding to an operation by the user of the sound field visualization device 1. The sound processing unit 15 converts a sound signal supplied from the microphone MC via the I / F 16 into digital data by A / D conversion. The audio processing unit 15 converts the supplied digital data into an analog signal by D / A conversion, and supplies the analog signal to the speaker SP via the I / F 16.

  In this embodiment, the case where the microphone MC and the speaker SP are connected to the sound field visualization device 1 will be described. However, even if the microphone MC and the speaker SP are built in the sound field visualization device 1. good. In this embodiment, the audio signal input from the microphone MC to the audio processing unit 15 and the audio signal output from the audio processing unit 15 to the speaker SP are analog audio signals. You may make it input / output. In such a case, it is not necessary to perform A / D conversion or D / A conversion in the voice processing unit 15. Moreover, although this embodiment demonstrates the case where the display part 13 and the operation part 14 are contained in the sound field visualization apparatus 1, an external input terminal and an external output terminal are provided in the sound field visualization apparatus 1, and an external monitor, It is good also as a structure which connects an external operation element.

The storage unit 12 of the sound field visualization device 1 includes a sound pressure data storage area 121 and a sound pressure average value data storage area 122. In the sound pressure data storage area 121, the sound pressure of the sound collected by the microphone MC and the reference position corresponding to the position where the sound is collected are stored in association with each other. Here, in the sound pressure data storage area 121, sound pressure data representing the sound pressure of the sound collected by the microphone MC is associated with data indicating a reference position corresponding to the position where the sound is collected. Are stored in time series. In the sound pressure average value data storage area 122, a correspondence relationship between a plurality of reference positions arranged in advance and an average value of sound pressures measured at positions corresponding to the respective reference positions (hereinafter referred to as “sound pressure average value”). Is memorized. FIG. 2 is a diagram showing an example of the stored contents of the sound pressure average value data storage area 122. In the example shown in FIG. 2, items of “reference position” and “sound pressure average value” are associated with each other and stored in this storage area. Among these items, the “reference position” item stores information for identifying each of a plurality of reference positions arranged in advance. Here, an example of specific contents of the reference position will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of an arrangement mode of a plurality of reference positions P (x _i , y _j ) (i and j are integers). In the example shown in FIG. 3, each position of each grid point when the space is divided into a grid is used as the reference position. More specifically, in the example shown in FIG. 3, the space is divided at the distance dx in the x-axis direction in the drawing, and the space is divided at the distance dy in the y-axis direction in the drawing. The position of the grid point is used as the reference position. That is, in the example shown in FIG. 3, the reference positions are arranged at the distance dx in the x-axis direction and at the distance dy in the y-axis direction.

  Returning to the description of FIG. In FIG. 2, the “sound pressure average value” item stores sound pressure average value data indicating the average value of the sound pressure detected at the position corresponding to each reference position. The control unit 11 of the sound field visualization device 1 performs a sound pressure average value calculation process, which will be described later, calculates a sound pressure average value for each reference position, and updates this table.

  Next, the functional configuration of the sound field visualization device 1 will be described with reference to the drawings. FIG. 4 is a diagram illustrating an example of a functional configuration of the sound field visualization device 1. In the figure, a sound pressure detecting unit 111, a position detecting unit 112, a reference position specifying unit 113, an average value calculating unit 114, and a display control unit 115 are read by the control unit 11 from a computer program stored in the ROM or the storage unit 12. It is realized by executing. The arrows in the figure schematically show the flow of data.

  The sound pressure detection unit 111 detects the sound pressure level of the sound signal representing the sound collected by the microphone MC every predetermined unit time. Here, the sound pressure detection unit 111 calculates the root mean square value of the amplitude of the sound signal. Note that the sound pressure calculation mode is not limited to this, and the sound pressure may be calculated using another calculation method. The sound pressure detection unit 111 supplies the calculated sound pressure level to the average value calculation unit 114. The position detection unit 112 detects the position of the microphone MC according to a signal output from the position sensor 21 every predetermined unit time.

The reference position specifying unit 113 is a reference in which the distance from the position detected by the position detection unit 112 is within a predetermined range from a plurality of reference positions arranged in advance for each predetermined unit time. One or more positions are specified. Here, the position conversion process performed by the reference position specifying unit 113 will be described with reference to FIG. Here, the reference position specifying unit 113 specifies the reference position having the shortest distance from the position detected by the position detecting unit 112. Specifically, in FIG. 3, when the detected position is a position in the area A1, the reference position specifying unit 113 converts the detected position into a reference position P (x ₋₁ , y ₂ ). In other words, the reference position specifying unit 113 is a reference in which the distance in the x-axis direction is within the distance dx / 2 from the position detected by the position detection unit 112 and the distance in the y-axis direction is within the distance dy / 2. Identify the location. The reference position specifying unit 113 stores the specified reference position and the sound pressure detected by the sound pressure detecting unit 111 in time series in the sound pressure data storage area 121 in association with each other.

  Based on the sound pressure data stored in the sound pressure data storage area 121 and the reference position, the average value calculation unit 114 performs a predetermined calculation for the sound pressure corresponding to each reference position for each of the plurality of reference positions. I do. Here, based on the sound pressure data stored in the sound pressure data storage area 121 and the reference position, the average value calculation unit 114 calculates the average value of the sound pressure corresponding to each reference position for each of the plurality of reference positions. calculate. The average value calculation unit 114 sequentially updates the storage contents of the sound pressure average value data storage area 122 using the calculated average value for each reference position.

The display control unit 115 controls the display unit 13 to display an image corresponding to the sound pressure detected by the sound pressure detection unit 111 on the display unit 13. Here, the display control unit 115 displays an image corresponding to the sound pressure detected by the sound pressure detection unit 111 (hereinafter referred to as “sound pressure image”) at a display position corresponding to the reference position specified by the reference position specifying unit 113. ) Is displayed. More specifically, here, the display control unit 115 calculates an average of images representing the average value calculated by the average value calculation unit 114 (that is, the average value stored in the sound pressure average value data storage area 122). It is displayed at the display position corresponding to the reference position corresponding to the value. Here, an example of specific contents of the display control process performed by the display control unit 115 will be described with reference to the drawings. FIG. 5 is a diagram illustrating an example of a screen displayed on the display unit 13. In the example shown in FIG. 5, the reference position _{P (x} i, _{y j)} in the respective display positions of the respective reference position _{P (x} i, _{y j)} into a circular image G1, G2 representing a sound pressure average values corresponding, … Is displayed. In the example shown in FIG. 5, the magnitude of the sound pressure is represented by the size of the circular image. The display control unit 115 displays a circle image at a display position corresponding to each reference position so that the larger the sound pressure average value corresponding to each reference position is, the larger the size of the circle image is. At this time, the display control unit 115 does not display a circular image for a reference position where no sound pressure is detected at a corresponding position among the plurality of reference positions.

<Operation>
Next, the operation of this embodiment will be described. The user of the sound field visualization device 1 performs an operation for starting the sound field visualization process using the operation unit 14 of the sound field visualization device 1. The operation unit 14 outputs an operation signal corresponding to the operation content of the user, and the control unit 11 starts sound field measurement processing according to the signal output from the operation unit 14. When the sound field measurement process is disclosed, the user holds the microphone device 2 and moves in a space where the sound field is desired to be measured. In the following description, in order to facilitate the description, an operation when the user moves the microphone device 2 on a two-dimensional plane will be described. However, the present invention is not limited to this, and the user may move the microphone device 2 in the three-dimensional space.

  When the user holds the microphone device 2 and moves in the space, the microphone MC moves in the space. The position sensor 21 attached to the microphone MC detects the position in the space of the microphone MC and outputs a signal representing the detected position to the sound field visualization device 1. The microphone MC collects sound in the space and outputs a sound signal representing the collected sound to the sound field visualization device 1. The control unit 11 of the sound field visualization device 1 detects the sound pressure of the sound signal output from the microphone MC every predetermined unit time. In addition, the control unit 11 generates position information indicating the position of the microphone MC based on the signal output from the position sensor 21.

  The control unit 11 detects the position of the microphone MC every predetermined unit time (for example, 30 msec), and specifies a reference position close to the detected position. Here, as illustrated in FIG. 3, the control unit 11 specifies a reference position having the smallest distance from the detected position. The control unit 11 stores the identified reference position and the detected sound pressure in time series in the sound pressure data storage area 121 in association with each other.

  Moreover, the control part 11 is a position corresponding to each reference position for each of a plurality of reference positions according to the correspondence stored in the sound pressure data storage area 121 every predetermined unit time (for example, 30 msec). The average value of the detected sound pressure is calculated, and the storage content of the sound pressure average value data storage area 122 is updated according to the calculation result. By executing this process, the sound pressure average value for each reference position stored in the sound pressure average value data storage area 122 is sequentially updated every predetermined unit time.

  The control unit 11 refers to the sound pressure average value data storage area 122 and displays an image representing the sound pressure average value for each reference position on the display unit 13. As shown in FIG. 5, for each of the plurality of reference positions, a circular image representing the sound pressure average value corresponding to the reference position is displayed. The control unit 11 repeatedly executes the sound pressure detection process, the position detection process, the reference position specifying process, and the display control process every predetermined unit time, and sequentially updates the display content of the display unit 13. That is, the screen illustrated in FIG. 5 is updated sequentially every predetermined unit time.

  By the way, when visualizing the sound field, if it is attempted to display the detected sound pressure at all positions where the sound pressure is detected, the display will not be complicated, and the user will distribute the sound pressure distribution. It is difficult to grasp. On the other hand, according to this embodiment, since the sound pressure is displayed only at a plurality of reference positions, the display can be easily viewed. By visually recognizing the screen displayed on the display unit 13, the user can intuitively grasp the sound pressure distribution in the sound field that the user wants to measure. Thus, according to the present embodiment, the sound field can be visualized more intuitively and easily. In addition, according to the present embodiment, the microphone position (measurement position) is not determined in advance and sequentially measured, but the user can arbitrarily change the microphone position in real time while confirming the display contents. it can.

<Modification>
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. An example is shown below. In addition, you may combine each following aspect suitably.
(1) In the above-described embodiment, the control unit 11 of the sound field visualization device 1 detects the sound pressure from the sound signal output from the microphone MC, and displays an image corresponding to the detected sound pressure on the display unit 13. However, the physical quantity detected by the control unit 11 is not limited to sound pressure, and for example, quantities such as particle velocity, acoustic intensity, and acoustic impedance may be detected as physical quantities. In short, the control unit 11 may detect a physical quantity representing the characteristics of the sound from the sound signal output from the microphone MC and display an image corresponding to the detected physical quantity on the display unit 13.

(2) In the above-described embodiment, the control unit 11 may display an image representing the locus of movement of the microphone MC as indicated by the chain line R in FIG. In this case, the control unit 11 is configured to store the detected position of the microphone MC in a predetermined storage area of the storage unit 12 in time series, and the control unit 11 refers to the storage unit 12 to configure the microphone MC. The movement trajectory may be displayed on the display unit 13 together with the sound pressure image (circle image).

(3) In the above-described embodiment, the position sensor 21 may detect the attitude of the microphone MC in addition to the position of the microphone MC. In this case, the position sensor 21 detects the position and orientation of the microphone MC, and outputs a signal indicating the detection result to the sound field visualization device 1. The control unit 11 of the sound field visualization device 1 identifies the position and orientation of the microphone MC according to the signal output from the position sensor 21, and each reference position is detected at a position corresponding to each reference position. An image representing the sound pressure and posture may be displayed on the display unit 13. In this case, for example, the control unit 11 may display an arrow indicating the posture of the microphone MC. Here, the attitude of the microphone MC is an attitude defined by, for example, an orthogonal coordinate system x ₁ , y ₁ , z ₁ . In this case, it may be a positive direction of z ₁ axis in the longitudinal direction of the orientation of the microphone MC.

  In addition, when the position sensor 21 detects the attitude of the microphone MC, the control unit 11 generates an image representing the sound collection direction (physical direction and direction of the microphone MC) based on the detected attitude. You may make it display on the display part 13. FIG. In this case, the microphone MC is configured to use sound collection means having sound collection directivity, and the control unit 11 collects the sound from the microphone MC based on the detected posture (or the sound collection direction from the microphone MC). The direction of the axis serving as a reference for the sex) may be specified, and an image representing the specified sound collection direction (or the specified direction of the axis) may be displayed on the display unit 13. In this case, for example, a microphone array composed of a plurality of microphones may be used as the directional microphone MC. FIG. 6 is a diagram illustrating an example of a screen displayed on the display unit 13 in this aspect. As shown in the figure, the control unit 11 displays circular images G1, G2,... Corresponding to the sound pressures corresponding to the respective reference positions at each of the plurality of reference positions, and the sound collection direction (or the respective reference positions) (or Arrow images G11, G12,... Representing the directivity axis direction) are displayed. In this case, when there are a plurality of sound collection directions (or directions of directivity axes) detected at each reference position, the control unit 11 displays a combination of vectors representing those directions. Moreover, you may make it display the arrow showing the direction with the highest detection frequency among several directions. By visually recognizing the screen illustrated in FIG. 6, the user can intuitively grasp the sound pressure at each reference position and the sound collection direction (or direction of the directivity axis).

  In addition, as an example of another display mode in which the control unit 11 displays the sound pressure at each reference position and the sound collection direction (or direction of the directivity axis), for example, as shown in FIG. A vector representing the sound collection direction (or direction of the directivity axis) may be displayed. In the example shown in FIG. 7, the control unit 11 represents the sound pressure (average value of sound pressure) at each reference position by its length, and the sound collection direction (or direction of the directivity axis) in the direction of the arrow. Representing vector images G21, G22,... Are displayed for each reference position. Also in this case, as described above, when there are a plurality of sound pickup directions (or directions of directivity axes) detected at each reference position, the control unit 11 displays a combination of a plurality of vectors. Alternatively, an arrow indicating a direction with the highest detection frequency among a plurality of directions may be displayed. By visually recognizing the screen illustrated in FIG. 7, the user can intuitively grasp the sound pressure at each reference position and the sound collection direction (or direction of the directivity axis).

(4) In the above-described embodiment, the control unit 11 changes the display mode of the image corresponding to the sound pressure detected within a predetermined time and the image corresponding to the sound pressure detected before that. You may do it. Specifically, for example, the control unit 11 displays a sound pressure image only for a reference position corresponding to a position detected within a predetermined time (for example, within 20 sec), and before that (for example, 20 sec) The sound pressure may not be displayed for the reference position corresponding to the position detected before). In this case, with the movement of the microphone MC, the sound pressure image is displayed only for the reference position corresponding to the position where the microphone MC is detected within a certain time, and the microphone MC detects before the certain time. The sound pressure image is not displayed for the reference position corresponding to the set position. That is, only the sound pressure image corresponding to the latest time is displayed, and the old sound pressure image disappears from the display sequentially. In this way, since only the sound pressure image at the reference position corresponding to the position detected within a certain time is displayed, the user can intuitively grasp the sound pressure measured in real time by the user. Easy to do.

  Further, the control unit 11 may change the display mode of the sound pressure image according to the length of time that has elapsed since the sound pressure was detected. Specifically, for example, the control unit 11 may make the display of the sound pressure image lighter as the time elapsed since the sound pressure was detected is longer. More specifically, for example, for each of the plurality of reference positions, the control unit 11 uses the same sound pressure as that of the above-described embodiment for the reference position whose distance from the position of the microphone MC is within a predetermined range. While the image display process is performed, for other reference positions, the display density q (initial value is 1) is multiplied by a coefficient k (k <1) every predetermined unit time, and the display density q The sound pressure image may be displayed at a density corresponding to the value. In this case, since the display of the sound pressure image becomes lighter as the elapsed time after the sound pressure is detected, the old detection result is displayed as an afterimage. By doing so, it is easy for the user to intuitively grasp the measurement result in real time by associating the current position of the microphone MC with the measurement result. In short, since the sound pressure at the current position of the microphone MC is displayed most intensely, it is possible to intuitively understand the association between the current position of the held microphone MC and the display content.

(5) In the above-described embodiment, the control unit 11 calculates the sound pressure average value for each reference position, and displays an image representing the calculated sound pressure average value. However, the reference position performed by the control unit 11 For example, the control unit 11 may calculate the mean square value of the sound pressure for each reference position. For example, the control unit 11 may calculate for each reference position. The sound pressure (or sound pressure range) with the highest detection frequency may be specified. In short, the control unit 11 refers to the stored contents of the sound pressure data storage area 121, performs a predetermined calculation for the sound pressure corresponding to each reference position for each of the plurality of reference positions, and outputs the calculation result. The image to be displayed may be displayed at a display position corresponding to the reference position corresponding to the calculation result.

In the above-described embodiment, the control unit 11 performs the calculation of calculating the average value of the sound pressure at each reference position every predetermined unit time. However, the calculation of calculating the average value is performed. It may not be possible. In this case, the control unit 11 determines in advance a process for detecting the sound pressure of the sound signal and a process for detecting a position of the microphone MC and specifying a reference position within a predetermined range from the detected position. It may be executed every unit time, and an image representing the detected sound pressure (the detected sound pressure itself) may be sequentially displayed at the specified reference position.
That is, the control unit 11 may display an image representing an average sound pressure value at each reference position (an image representing a calculation result at each reference position), or represents, for example, the detected sound pressure itself. An image may be displayed. The point is that the control unit 11 may display an image corresponding to the sound pressure of the sound collected by the microphone.

(6) In the above embodiment, for convenience of explanation, the operation when the microphone device 2 moves on a two-dimensional plane has been described. However, the present invention is not limited to this, and the microphone device 2 moves in a three-dimensional space. Also good. In this case, instead of the image illustrated in FIG. 5 described above, a three-dimensional space and reference positions arranged in the space are displayed, and sound pressure images and sound collection directions at the respective reference positions are displayed. What is necessary is just to make it display in three dimensions in three-dimensional space.

(7) In the above-described embodiment, the control unit 11 of the sound field visualization device 1 specifies the reference position having the shortest distance from the position of the microphone MC detected by the position sensor 21. The specific mode of the reference position is not limited to this. In short, if the control unit 11 specifies one or more reference positions that are located within a predetermined range with respect to the position detected by the position sensor 21. Good. Specifically, for example, in the example illustrated in FIG. 3, the control unit 11 determines a reference position where the distance in the x-axis direction with respect to the detected position is within dx and the distance in the y-axis direction is within dy. It may be specified. In this case, a plurality of reference positions are specified for the detected position.

(8) In the above-described embodiment, a predetermined sine wave is emitted from the speaker SP. However, the sound emitted from the speaker SP is not limited to this. For example, white noise is emitted. Also good. In the above-described embodiment, the test sound wave is emitted using the speaker SP. However, the present invention is not limited to this, and the test sound wave may not be emitted from the speaker SP. For example, when having a sound source that emits its own sound such as an OA device or a home appliance, the sound field visualization device 1 is used to display the sound field in order to detect abnormal sounds emitted from these devices. Thus, it is possible to identify a component or member in which an abnormal sound is generated in an OA device or a home appliance without emitting a test sound wave from the speaker SP.

(9) In the above-described embodiment, the control unit 11 causes the display unit 13 to display a circular image corresponding to the detected sound pressure so that the larger the detected sound pressure, the larger the size of the circular image. I did it. The display mode of the sound pressure is not limited to this, and for example, the magnitude of the sound pressure may be represented by color shading or color difference (hue). In short, the control unit 11 may display an image representing the detected sound pressure on the display unit 13.

(10) In the above-described embodiment, the plurality of reference positions are the positions of the respective grid points when the space is divided into a grid pattern. However, the arrangement of the reference positions is not limited thereto. The center point of each space when the space is divided into honeycombs may be used as the reference position. In short, the plurality of reference points may be any as long as they are arranged in a predetermined arrangement manner in the space.

(11) In the above-described embodiment, the sound field visualization device 1 and the microphone device 2 are connected by an audio cable or the like. However, the present invention is not limited to this, and the sound field visualization device 1 and the microphone device 2 are connected to the Internet. You may connect by communication networks, such as LAN (Local Area Network).
In the above-described embodiment, the sound field visualization device 1 and the microphone device 2 are configured as separate bodies. However, the present invention is not limited thereto, and the sound field visualization device 1 and the microphone device 2 are configured as a single unit. Also good. In this case, the user may perform the sound field measurement process while holding the sound field visualization device configured as an integral unit.

(12) In the above-described embodiment, the control unit 11 detects the sound pressure every predetermined unit time (hereinafter referred to as “unit time t ₁ ”), but in addition to this, the control unit 11 A representative value of the detected sound pressure may be specified every predetermined unit time T (T> t ₁ ), and a sound pressure image may be displayed using the specified representative value. More specifically, for example, as illustrated in FIG. 8, in addition to the x-axis and the y-axis, the time axis t is used to display the sound pressure image and the image representing the movement locus in a three-dimensional manner. Also good. As an aspect of calculating the representative value, for example, the control unit 11 may calculate the average value of the detected sound pressure for each predetermined unit time T, and for example, the detected value may be detected. You may make it identify the value with the highest detection frequency among sound pressures.

(13) In the above-described embodiment, the case where the respective units illustrated in FIG. 4 are realized as software by the control unit 11 of the sound field visualization device 1 executing the computer program stored in the ROM or the storage unit 12 will be described. However, the present invention is not limited to this, and each unit of the sound field visualization device 1 illustrated in FIG. 4 may be configured as hardware. In the above-described embodiment, the program executed by the control unit 11 of the sound field visualization device 1 includes a magnetic recording medium (magnetic tape, magnetic disk, etc.), an optical recording medium (optical disk, etc.), a magneto-optical recording medium, and a semiconductor memory. It can be provided in a state where it is recorded on a computer-readable recording medium. It is also possible to download the sound field visualization apparatus 1 via a network such as the Internet.

(14) In the above-described embodiment, the control unit 11 may aggregate past data for each reference position and perform an average process. Specifically, for example, when the user swings the microphone MC to the left or right, the sound pressure is displayed. At this time, past data is aggregated (averaged) and displayed for each reference position. By doing in this way, the place where the sound pressure is high (the place where the circular image is large, the place where it is red, etc.) gradually rises and is displayed. In the case of a fluctuating noise source such as an engine or a motor, it is possible to quickly search for a portion having a high sound pressure or a sound having a specific frequency.

  In the conventional apparatus, a certain amount of time is required until the fluctuation noise converges to a certain value for each reference position. Furthermore, since this is executed for a predetermined number of points, it took time for the measurement. On the other hand, according to this aspect, first, a point where the sound pressure is likely to be large is scanned by shaking it slowly and slowly, and if it hits, the point where the sound pressure is high is found by swinging back and forth finely to the left and right. Can do. The user need only concentrate on shaking the microphone while watching the display. Thus, according to this aspect, it is possible to search intuitively in real time. In this case, the control unit 11 may store points with high sound pressure and output them later.

DESCRIPTION OF SYMBOLS 1 ... Sound field visualization apparatus, 2 ... Microphone apparatus, 11 ... Control part, 12 ... Memory | storage part, 13 ... Display part, 14 ... Operation part, 15 ... Sound processing part, 21 ... Position detection part, 100 ... Sound field visualization system , SP ... speaker, MC ... microphone.

Claims (3)

Sound collecting means for collecting sound in a predetermined space and outputting a sound signal representing the collected sound;
Position detecting means for detecting the position of the sound collecting means in the space;
Physical quantity detection means for detecting a physical quantity representing the characteristics of the sound from the sound signal output from the sound collection means;
A reference position specifying means for specifying a reference position whose distance from a position detected by the position detecting means is within a predetermined range from among a plurality of reference positions previously arranged in the space;
Display control means for causing the display means to display an image in which the size of the physical quantity detected by the physical quantity detection means is indicated by a display size, the display corresponding to the reference position specified by the reference position specifying means A sound field visualization device comprising: display control means for displaying the position. Storage means for storing the physical quantity detected by the physical quantity detection means in association with the reference position specified by the reference position specifying means;
With reference to the storage contents of the storage means, and a calculation means for performing a predetermined calculation on a physical quantity corresponding to each reference position for each of the plurality of reference positions,
The sound field visualization apparatus according to claim 1, wherein the display control unit displays an image representing a calculation result of the calculation unit at a display position corresponding to a reference position corresponding to the calculation result. The sound collection means is a sound collection means having sound collection directivity,
The position detecting means detects the position and orientation of the sound collecting means;
The said display control means displays the image showing the sound collection direction of the said sound collection means on the said display means based on the attitude | position detected by the said position detection means. The said display means is characterized by the above-mentioned. Sound field visualization device.

Images