JP2005265480A - Field measurement system, wave source exploration method, and wave source exploration program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a field measurement system capable of suppressing operation amount regarding the calculation for distribution of measurement amounts to be detected while adopting a free scanning sensor system. <P>SOLUTION: The field measurement system comprises: a main sensor (12) capable of freely moving over the field to be tested and detecting the measurement amounts; a video camera (13) fixed at a position capable of photographing the field, for detecting the coordinates in the perpendicular surface to an optical axis (AX) of the main sensor (12); and a transmitter (13c) fixed on the video camera facing toward the testing field for transmitting the measurement waves for detecting the coordinates in the direction of the optical axis of the main sensor. The wave source of the transmitter (13c) is fixed on the optical axis (AX) of the video camera (13). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a field measurement system for measuring a distribution of a test amount in a test field, a wave source search method for specifying a wave source of the test wave based on a complex amplitude distribution of the test wave, and a computer used for the wave source search method It relates to a wave source exploration program to be executed.

  Due to the comfortable living environment, there is an increasing demand for quietness in OA equipment and home appliances. These devices are subjected to sound field measurement (sound pressure distribution measurement) before shipment. If the distribution of the complex sound pressure is measured and the sound source exploration technology such as phase shift method (beamformer, beamforming) or acoustic holography is applied to the measurement result, the component or member that is the sound source is specified. You can also

A conventional sound field measurement system detects sound pressure at each position by arranging microphones in an array or scanning a sound field with a microphone using a precision stage.
The inventors of the present invention have proposed to introduce a “free sensor system” to this sound field measurement system (Non-patent Document 1, etc.).
In this sound field measurement system, the measurement person can hold the microphone in his hand and scan it arbitrarily. Instead, the system takes a video of the sound field to be detected with a camera, automatically recognizes the microphone's position coordinates from the camera's shooting data, etc., and associates the position coordinates with the output of the microphone. Obtain the pressure distribution.

In this free scanning sensor system, an ultrasonic transmitter is provided on the front surface of the camera, and an LED marker is provided on the front surface of the microphone.
Using the ultrasonic pulse transmitted from the ultrasonic transmitter, the recognition accuracy of the coordinate in the optical axis direction of the microphone is improved, and the microphone is labeled with the LED marker so that the direction of the microphone is perpendicular to the optical axis of the microphone. Coordinate recognition accuracy is improved.
Natsumi Yoshizumi, Kentaro Nakamura, Sadayuki Kamiha, “Real-time sound field visualization system using free-scanning microphone (2)-3D position detection of microphone”, Acoustical Society of Japan, Acoustical Society of Japan, March 2003 , Item 2-11-6, P1367-1368

However, in this sound field measurement system, since the microphone coordinates are automatically recognized, the computational load on the computer is large, and the measurement time tends to be long.
In addition, although the sound source search method is known, the measurement data obtained by the free scanning sensor system is composed of sound pressure data of random coordinates, so that even if the sound source search method is applied as it is, the sound source cannot be identified well.

Therefore, an object of the present invention is to provide a field measurement system that can suppress the amount of calculation involved in calculating the distribution of the test amount while adopting the free scanning sensor system.
It is another object of the present invention to provide a wave source search method capable of reliably performing sound source search while employing a free scanning sensor system.
It is another object of the present invention to provide a wave source search program for causing a computer to execute the wave source search method of the present invention.

  The field measurement system according to claim 1 is capable of arbitrarily moving within a test field, is fixed to a main sensor that detects a test amount, and a position where the test field can be photographed, A video camera for detecting coordinates in a plane perpendicular to the optical axis of the sensor, and a measurement wave fixed to the video camera for detecting coordinates in the optical axis direction of the main sensor toward the test field. In a field measurement system comprising a wave transmitter, the wave source of the transmitter is on the optical axis of the video camera.

The field measurement system according to claim 2 is the field measurement system according to claim 1, wherein the transmitter includes a transducer that generates a sound wave for coordinate detection, and the transducer includes the transducer It is a cylindrical vibrator whose central axis coincides with the optical axis of the video camera.
The field measurement system according to claim 3 is the field measurement system according to claim 2, wherein the main sensor is a microphone that detects sound pressure as the amount to be measured, and receives the sound waves for coordinate detection. It also serves as a sensor that detects the coordinates in the optical axis direction of the main sensor by wave.

  The field measurement system according to claim 4 is capable of arbitrarily moving within the test field, is fixed to a main sensor that detects the test amount, and a position where the test field can be photographed, In a field measurement system, comprising: a video camera for detecting coordinates in a plane perpendicular to the optical axis of the sensor; and a light emitting unit fixed to the main sensor for marking the video camera. The arrangement pattern is characterized in that the arrangement pattern is symmetric with respect to the sensor portion of the main sensor.

  The field measurement system according to claim 5 is capable of arbitrarily moving in the test field, and is fixed to a microphone that detects sound pressure as a test quantity and a position where the test field can be imaged. A video camera for detecting coordinates in a plane perpendicular to the optical axis of the microphone, and a sound wave for coordinate detection in the direction of the optical axis of the microphone, which is fixed to the video camera and is directed to the test field In the field measurement system including the transmitter, the microphone also serves as a sensor that receives the sound wave for coordinate detection and detects the coordinate in the optical axis direction, and the microphone and the video camera. A sing-around method in which the transmission timing and the reception timing of the sound wave for coordinate detection are associated with each other is applied.

  The sound source exploration method according to claim 6 is capable of arbitrarily moving in the test field, and includes a main sensor that detects a complex amplitude of a test wave with reference to a predetermined position in the test field, and the test target. A wave source search method applied to a field measurement system including a detection means for detecting a position coordinate of the main sensor in a detection field, wherein the detected complex amplitude data is detected at the same timing. A procedure for associating with the position coordinates, a procedure for interpolating and / or thinning out the data associated with the position coordinates so as to become data of each coordinate regularly arranged in the test site, and the processed data And a procedure for exploring a wave source in the test field based on the above.

  The sound source exploration program according to claim 7 is capable of arbitrarily moving within the test field, and includes a main sensor that detects a complex amplitude of a test wave with reference to a predetermined position in the test field, A sound source exploration program for a computer applied to a field measurement system comprising detection means for detecting a position coordinate of the main sensor in the inspection field, wherein the detected complex amplitude data is transmitted at the same timing as the program. A procedure for associating with the detected position coordinates, a procedure for interpolating and / or thinning out the data associated with the position coordinates so as to become data of each coordinate regularly arranged in the test field, and the processing And a procedure for exploring a wave source in the test site based on the obtained data.

According to the present invention, a field measurement system capable of suppressing the amount of calculation required for calculating a distribution while employing a free scanning sensor system is realized.
In addition, according to the present invention, a wave source search method capable of reliably performing sound source search while employing a free scanning sensor system is realized.
According to the present invention, a wave source search program for causing a computer to execute the wave source search method of the present invention is realized.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, FIG. 3, and FIG.
The present embodiment is an embodiment of a sound field measurement system in which a free scanning sensor system is employed.
As shown in FIG. 1, this system measures the sound field around the sound source 11 (measures the sound pressure distribution). A sound wave in a predetermined wavelength range emitted from the sound source 11 (hereinafter referred to as an audible sound wave) is a test sound wave.

First, the overall configuration of this system will be described.
As shown in FIG. 1, the system includes a main microphone 12, a video camera 13, a reference microphone 14, a computer 16, and the like.
The main microphone 12 has a size and weight that can be supported by the measurer, and is freely scanned by the measurer as indicated by an arrow in FIG.

At this time, the main microphone 12 repeatedly receives the test sound wave at a predetermined sampling period, and repeatedly outputs a signal indicating the complex sound pressure P (sound pressure signal). Since the value of the complex sound pressure P is represented by the value of the amplitude A and the phase φ of the test sound wave, the complex sound pressure is hereinafter represented as “P (A, φ)”.
The video camera 13 is fixed at a position where the entire test sound field including the main microphone 12 can be captured, and continuously outputs a signal (image signal) indicating an image of the test sound field. As the video camera 13, for example, a CCD camera is used.

Reference microphone 14 is fixed to a predetermined position of the Ken'on hall, and reception repeatedly test sound wave at the predetermined position at the same time as the main microphone 12, the phase (reference phase) phi signal indicating ₀ (reference phase Signal).
In the vicinity of the lens barrel 13b of the video camera 13, a transmitter 13c that repeatedly transmits a sound wave having a wavelength outside the wavelength range of the test sound wave (hereinafter referred to as an ultrasonic wave) is provided. For example, an aerial ultrasonic transducer having a resonance frequency of 40 kHz is used as the transmitter 13c.

The ultrasonic wave transmitted from the transmitter 13c is received by the main microphone 12 together with the test sound wave. The main microphone 12 outputs a signal (distance signal) indicating the coordinate Z of the main microphone 12 in the optical axis AX direction with respect to the video camera 13 at the received timing.
An LED marker 12b is provided in the vicinity of the sound receiving unit 12a of the main microphone 12. As the LED marker 12b, for example, an ultra-bright LED is used. The LED marker 12b serves to label the main microphone 12.

Next, processing in the computer 16 will be described.
The computer 16 sequentially captures the sound pressure signal from the main microphone 12, the distance signal, the reference phase signal from the reference microphone 14, and the image signal from the video camera 13.
The complex sound pressure P (A, φ) is recognized from the sound pressure signal, and the reference phase φ ₀ is recognized from the reference phase signal.

The phase φ of the complex sound pressure P (A, φ) is converted into a difference value Δφ from the reference phase φ ₀ detected at the same timing. Hereinafter, the complex sound pressure represented by the difference value Δφ is represented as P (A, Δφ).
Further, the coordinate Z in the optical axis AX direction of the main microphone 12 is recognized from the distance signal.
Further, the coordinates (X ′, Y ′) of the main microphone 12 on the image are recognized from the image signal (where the coordinate origin is the image center).

At this time, the computer 16 recognizes the coordinates of the LED marker 12b on the image (however, the coordinate origin: the image center), and the coordinate relationship between the LED marker 12b and the sound receiving unit 12a of the main microphone 12 is determined. Is converted into the coordinates (X ′, Y ′) of the main microphone 12 (where the coordinate origin is the image center).
Further, the position coordinate (X, Y, Z) of the main microphone 12 is recognized from the coordinate (X ′, Y ′) and the coordinate Z described above.

At this time, the computer 16 corrects the coordinates (X ′, Y ′) according to the coordinates Z, and obtains the coordinates (X, Y) in the plane perpendicular to the optical axis AX of the main microphone 12. A combination (X, Y, Z) of the coordinate (X, Y) and the coordinate Z is the position coordinate (X, Y, Z) of the main microphone 12.
Further, the computer 16 detects the detected complex sound pressures P (A, Δφ) and the sequentially recognized position coordinates (X, Y, Z) detected at the same timing. Store in association with each other.

Hereinafter, data of a certain complex sound pressure P (A, Δφ) associated with a certain position coordinate (X, Y, Z) is represented by “P _i ” (where i is a coordinate). Each data P ₁ , P ₂ , P ₃ ... Indicates a distribution of complex sound pressures in the sound field to be examined.
The computer 16 displays an image captured by video on the screen 16a and draws the locus of the main microphone 12 as a curve on the image. The locus is obtained from the coordinates (X, Y) of the main microphone 12 that are sequentially recognized.

As a result, the measurer can visually confirm how the main microphone 12 has been scanned.
The computer 16 can also display the amplitude A of the test sound wave on the screen 16a. For example, the magnitude of the amplitude A is displayed by the color of the curve.
As a result, the measurer can visually confirm on the screen where the sound is strong.

  As such a computer 16, for example, a notebook computer having a clock frequency of 2.2 GHz and an A / D converter sampling frequency of 100 kS / s is used. For example, the computer 16 obtains the coordinates (X ′, Y ′) of the main microphone 12 five times per second from an image signal of an image within 0.4 m perpendicular to the optical axis AX at a distance of 0.5 m. Automatic recognition can be performed sequentially with an error of 7 mm.

Next, the transmitter 13c of the video camera 13 will be described in detail.
As shown in FIG. 2, the transmitter 13c includes a cylindrical piezoelectric vibrator 13c-1 and a skirt-like reflector 13c-2.
The inner diameter of the piezoelectric vibrator 13c-1 is slightly larger than the outer diameter of the lens barrel 13b of the video camera 13. The piezoelectric vibrator 13c-1 is fixed to the camera body 13a of the video camera 13 so as to cover the lens barrel 13b in a posture in which the center line thereof coincides with the optical axis AX.

  The inner diameter of the reflecting plate 13c-2 is slightly larger than the outer shape of the piezoelectric vibrator 13c-1. The reflector 13c-2 is fixed to the camera body 13a of the video camera 13 so as to cover the piezoelectric vibrator 13c-1 in a posture in which the center line thereof coincides with the optical axis AX. The direction of the reflecting plate 13c-2 is a direction in which the widened portion faces the front (object side) of the video camera 13 and the constricted portion faces the rear (image side) of the video camera 13.

  In such a wave transmitter 13c, when the piezoelectric vibrator 13c-1 is driven, as shown in FIG. 3, the piezoelectric vibrator 13c-1 vibrates in a direction in which its diameter expands and contracts, and generates ultrasonic waves. generate. The ultrasonic wave travels in the normal direction from the outer surface of the piezoelectric vibrator 13c-1. The ultrasonic wave is reflected by the inner wall of the reflector 13c-2, and then travels in front of the video camera 13 substantially parallel to the optical axis AX. That is, the wave source O of the transmitter 13c exists on the optical axis AX behind the video camera 13, and the ultrasonic wave travels as if it is generated therefrom.

Next, the LED marker 12b of the main microphone 12 will be described in detail.
As shown in FIG. 4, three LED markers 12b are provided.
The three LED markers 12b surround the sound receiving portion 12a of the main microphone 12 and are arranged in a symmetrical positional relationship with respect to the sound receiving portion 12a. On the arrangement surface of the three LED markers 12b, the average position thereof coincides with the center position of the sound receiving unit 12a.

The three LED markers 12b are arranged on the same surface as the sound receiving portion 12a or on the rear side surface of the sound receiving portion 12a so as not to block the test sound wave incident on the sound receiving portion 12a. The three LED markers 12b are fixed to the sound receiving unit 12a via an arm or the like.
Next, the effect of this system will be described.
In this system, since the ultrasonic wave source O of the transmitter 13c exists on the optical axis AX (see FIG. 3), the origin of the coordinate Z is also on the optical axis AX. Since the image center of the video camera 13 corresponds to the optical axis AX, the origin of the coordinates (X ′, Y ′) is also on the optical axis AX.

Therefore, when the computer 16 of this system recognizes the position coordinates (X, Y, Z), it is not necessary to perform origin matching between the coordinates Z and the coordinates (X ′, Y ′). Therefore, the calculation load of the computer 16 can be suppressed.
In the present system, the arrangement pattern of the three LED markers 12b is a symmetrical arrangement pattern with respect to the sound receiving unit 12a of the main microphone 12 (see FIG. 4).

Therefore, the calculation for the computer 16 to convert the coordinates of the three LED markers 12b into the coordinates (X ′, Y ′) of the main microphone 12 is only the coordinate average of the three coordinates. Therefore, the calculation load of the computer 16 can be suppressed.
[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG.

The present embodiment is an embodiment of a sound field measurement system in which a free scanning sensor system is employed. Here, only differences from the sound field measurement system of the first embodiment will be described.
The difference is that a sing-around method in which the transmission timing and reception timing of the ultrasonic wave are associated is applied between the video camera 13 and the main microphone 12.
First, the circuit configuration of the video camera 13 and the main microphone 12 to which the sing-around method is applied will be described.

  As shown in FIG. 5, the main microphone 12 includes a trigger circuit 12d, a frequency counter 12e, and the like. The trigger circuit 12d is disposed at a subsequent stage of the filter 12c that separates the ultrasonic signal and the test sound wave signal. An ultrasonic signal is input to the trigger circuit 12d. A trigger signal generated by the trigger circuit 12d is input to the LED marker 12b and the frequency counter.

On the other hand, the video camera 13 includes a light receiving unit 13d that detects the light emission timing of the LED marker 12b. The detection signal of the light receiving unit 13d is input as a trigger signal for the drive circuit 13e that drives the piezoelectric vibrator 13c-1.
Next, operations of the video camera 13 and the main microphone 12 to which the sing-around method is applied will be described.

When the drive circuit 13e drives the piezoelectric vibrator 13c-1, an ultrasonic pulse is generated once. The ultrasonic pulse is received by the sound receiving unit 12 a of the main microphone 12. The received ultrasonic pulse is separated from the test sound wave (in this case, an audible sound wave) by the filter 12c and input to the trigger circuit 12d.
The trigger circuit 12d generates a trigger signal at the input timing, and causes the LED marker 12b to emit light once.

The light emitted by the LED marker 12b is detected by the light receiving unit 13d of the video camera 13, and the detection signal of the light receiving unit 13d is given to the drive circuit 13e as a trigger signal. At that timing, the drive circuit 13e drives the piezoelectric vibrator 13c-1. In response, a second ultrasonic pulse is generated from the piezoelectric vibrator 13c-1.
Such an operation is repeated between the camera 13 and the main microphone 12.

If such an operation is repeated, after the ultrasonic pulse is generated, a time until the ultrasonic pulse is received is given, and then the next ultrasonic pulse is generated. The generation period of this ultrasonic pulse indicates the distance between the video camera 13 and the main microphone 12.
In order to convert this distance into a signal, the frequency counter 12e of the main microphone 12 counts the frequency at which the trigger signal is generated from the trigger circuit 12d. This count value is output to the computer 16 as a distance signal.

Next, the effect of this system will be described.
In this system, since the sing-around method is applied, the main microphone 12 outputs a distance signal (here, the generation frequency of the trigger signal) that directly indicates the distance between the video camera 13 and the main microphone 12. .
Therefore, the unit conversion performed when the computer 16 recognizes the coordinate Z from the distance signal is extremely simple. For example, if the unit of the distance signal is the frequency f, the conversion formula is 1 / f. Therefore, the calculation load of the computer 16 can be suppressed.

If this conversion is performed by a circuit in the main microphone 12, the calculation load on the computer 16 can be further suppressed.
[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIG.
This embodiment is an embodiment of a sound source search method applied to a sound field measurement system employing a free scanning sensor system.

The sound source search method is applied to the system of the first embodiment and is executed by the computer 16.
A “sound source search program” is installed in the computer 16 in advance. The computer 16 executes the following procedure according to the program.
The computer 16 stores data P ₁ , P ₂ , P ₃ ... Measured by the system of the first embodiment.

Since the main microphone 12 is freely scanned in the system of the first embodiment, the coordinates 1, ₂ , ₃ ,... Of each data P ₁ , P ₂ , P ₃ ,. As shown on the left side of, they are arranged randomly in each direction. Since the scanning speed is not always constant, the interval between adjacent coordinates is also different.
In order to specify a sound source from these data P ₁ , P ₂ , P ₃ ,..., A phase shift method is applied. However, in this sound source search method, the following processing is performed before the application.

First, data P ₁ , P ₂ , P ₃ ,... Of coordinates 1, 2, 3,... Randomly arranged in the vicinity of the predetermined plane S1 are displayed on the plane S1, as shown in FIG. Are converted (projected) into data P ₁ ′, P ₂ ′, P ₃ ′,... Of coordinates 1 ′, 2 ′, 3 ′,.
Data P ₁ ′ is data of coordinates existing in a predetermined area centered on coordinate 1 ′ among data P ₁ , P ₂ , P ₃ ,... (Data P of coordinate 1 in FIG. 6A). _1, obtained by interpolation processing based on such data P ₂₎ of the coordinates 2.

Data P ₂ ′ is data of coordinates existing in a predetermined area centered on coordinate 2 ′ among data P ₁ , P ₂ , P ₃ ,... (In FIG. 6A, data of coordinate 2). P2 etc.) is obtained by interpolation processing.
Similarly, the data P ₃ ′, P ₄ ′,... Are also obtained by interpolation processing based on any of the data P ₁ , P ₂ , P ₃ ,.

Note that when there is more data than necessary in the predetermined area, unnecessary data is thinned out.
The computer 16 applies the phase shift method to the data P ₁ ′, P ₂ ′, P ₃ ′,.
That is, the computer 16 phase-shifts the data P ₁ ′, P ₂ ′, P ₃ ′,... By shift amounts δ ₁ , δ ₂ , δ ₃ . Are converted (projected) to data P ₁ ″, P ₂ ″, P ₃ ″,... Of coordinates 1 ″, 2 ″, 3 ″,... Regularly arranged on a plane S 1 ′ inclined from the plane S _1. )

Further, the same transformation (projection) is performed by changing the inclination direction and position of the plane S1 ′, and the change of the data P ₁ ′, P ₂ ′, P ₃ ′,. Based on the change, the position of the sound source 11 is specified.
Next, the effect of this sound source search method will be described.
According to this sound source exploration method, the coordinates 1 ″, 2 ″, 3 ″, regularly arranged data P ₁ , P ₂ , P ₃ ,. Since the data P ₁ ″, P ₂ ″, P ₃ ″,... Are applied, the known phase shift method can be applied reliably, and the position of the sound source 11 can be reliably specified.

[Others]
In the third embodiment, the data P ₁ , P ₂ , P ₃ ,... Is subjected to interpolation and thinning processing and then phase-shifted, but the data P ₁ , P ₂ , P ₃ ,. However, phase shift, interpolation, and thinning may be performed simultaneously. In this case, the phase shift amounts δ ₁ , δ ₂ , δ ₃ ... Are corrected with different correction amounts.

In the third embodiment, the phase shift method is applied, but acoustic holography may be applied instead of the phase shift method.
In the first embodiment, the three LED markers 12b in which the XY coordinates of the center of gravity position coincide with the XY coordinates of the position of the sound receiving unit 12a are used. However, the XY coordinates of the center of gravity position are the positions of the sound receiving unit 12a. Four or more LED markers 12b that coincide with the XY coordinates may be used. However, it is desirable to use three because the number of LED markers 12b can be minimized.

In the first embodiment or the second embodiment, the main microphone 12 includes only the single sound receiving unit 12a. However, the main microphone 12 includes two or three sound receiving units 12a, "May be freely scanned. In this case, the distribution of the sound intensity of the sound source 11 can be measured as follows, and further, the total sound radiation power of the sound source 11 can be obtained.
The measurer scans the sound receiving unit group so as to surround the sound source 11. The sound pressure signal repeatedly output from the sound receiving unit group at this time represents not only the sound pressure P but also the particle velocity v.

The computer 16 determines the distribution of the sound pressure P and the particle velocity v in the same manner as the distribution of the sound pressure P in the first embodiment. Then, the distribution of the time integral value of P · v is obtained as the distribution of the sound intensity. Further, the computer 16 divides the sound intensity by area to obtain the total sound radiation power of the sound source 11.
In the first embodiment or the second embodiment, the sound field measurement using the microphone as the main sensor has been described. However, the present invention is also applicable to the measurement of a field other than the sound field. For example, the present invention can be applied to measurement of odor fields using odor sensors.

  In the third embodiment, the sound source search method has been described. However, the present invention is also applicable to a search method for wave sources other than the sound source. For example, the present invention can be applied to a light source search method.

1 is an overall configuration diagram of a sound field measurement system according to a first embodiment. 2 is an exploded view of a transmitter 13c of the video camera 13. FIG. It is a figure which shows the schematic cross section which cut | disconnected the video camera 13 by the surface containing optical axis AX, and the advancing direction of an ultrasonic wave. It is the figure which looked at the main microphone 12 from the position facing the sound receiving part 12a. It is a circuit block diagram of the video camera 13 and the main microphone 12 to which the sing-around method of 2nd Embodiment was applied. It is a figure explaining the sound source search method of 3rd Embodiment. (A) is a conceptual diagram showing a state of conversion from random data P ₁ , P ₂ , P ₃ ,... To regular data P ₁ ′, P ₂ ′, P ₃ ′,. (B) is a conceptual diagram which shows the mode of a phase shift.

Explanation of symbols

11 Sound source 12 Main microphone 12a Sound receiver 12b LED marker 12c Filter 12d Trigger circuit 12e Frequency counter 13 Video camera 13a Camera body 13b Lens barrel 13c Transmitter 13c-1 Piezoelectric vibrator 13c-2 Reflector 13e Drive circuit 13d Light receiver 14 Reference microphone 16 Computer 16a Screen AX Optical axis O Wave source

Claims (7)

A main sensor that can move arbitrarily in the test area and detects the test amount;
A video camera that is fixed at a position where the subject field can be photographed and detects coordinates in a plane perpendicular to the optical axis of the main sensor;
A field measurement system comprising: a transmitter that is fixed to the video camera and transmits a measurement wave for detecting coordinates in the optical axis direction of the main sensor toward the test field;
The wave source of the transmitter is
A field measurement system characterized by being on the optical axis of the video camera. The field measurement system according to claim 1,
The transmitter is
A vibrator that generates a sound wave for coordinate detection;
The vibrator is
A field measurement system comprising a cylindrical vibrator having a central axis aligned with an optical axis of the video camera. The field measurement system according to claim 2,
The main sensor is
A field measurement system, wherein the field detection system is a microphone that detects sound pressure as the amount to be measured, and also serves as a sensor that receives the sound waves for coordinate detection and detects coordinates in the optical axis direction of the main sensor. A main sensor that can move arbitrarily in the test area and detects the test amount;
A video camera that is fixed at a position where the test field can be photographed and detects coordinates in a plane perpendicular to the optical axis of the main sensor;
A field measurement system comprising: a light emitting portion fixed to the main sensor for signing to the video camera;
The arrangement pattern of the light emitting parts is as follows:
The field measurement system, characterized in that the arrangement pattern is symmetric with respect to the sensor portion of the main sensor. A microphone that can arbitrarily move in the test area and detects the sound pressure as the test quantity;
A video camera that is fixed at a position where the subject field can be photographed and detects coordinates in a plane perpendicular to the optical axis of the microphone;
A field measurement system comprising: a transmitter fixed to the video camera and transmitting a sound wave for detecting coordinates in the optical axis direction of the microphone toward the test field;
The microphone is
It also serves as a sensor that receives the sound waves for coordinate detection and detects coordinates in the optical axis direction,
Between the microphone and the video camera,
A field measurement system, wherein a sing-around method in which a transmission timing and a reception timing of a sound wave for coordinate detection are associated is applied. A main sensor capable of arbitrarily moving in the test field, and detecting a complex amplitude of the test wave with reference to a predetermined position in the test field,
A wave source exploration method applied to a field measurement system comprising: a detecting means for detecting a position coordinate of the main sensor in the test field,
Associating the detected complex amplitude data with the position coordinates detected at the same timing;
A procedure for interpolating and / or thinning out the data associated with the position coordinates so as to become data of each coordinate regularly arranged in the test field;
And a procedure for searching for a wave source in the test site based on the processed data. A main sensor capable of arbitrarily moving in the test field, and detecting a complex amplitude of the test wave with reference to a predetermined position in the test field,
A sound source exploration program for a computer applied to a field measurement system comprising: a detecting means for detecting a position coordinate of the main sensor in the test field,
Associating the detected complex amplitude data with the position coordinates detected at the same timing;
A procedure for interpolating and / or thinning out the data associated with the position coordinates so as to become data of each coordinate regularly arranged in the test field;
And a procedure for searching for a wave source in the test site based on the processed data.

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