Test sound source with positioning function for sound school calibration

Abstract

The utility model relates to the technical field of acoustic calibration discloses a kind of testing sound source with positioning function for acoustic calibration, including the first laser that can emit cross light, second laser and third laser, the first laser is set on the vertical plane of the reference axis of the sound center of testing sound source, the third laser is set on the horizontal plane of the reference axis of the sound center of testing sound source, the vertical light ray of second laser and first laser coincides, to make the distance between the test point of the equipment to be calibrated and the sound center of testing sound source be calibration requirement distance, the vertical light ray all intersects with the horizontal light ray of third laser, and its intersection point coincides with test point, to realize the positioning indication of the equipment to be calibrated. With the aid of the testing sound source of the utility model, the positioning of test point of the equipment to be calibrated can be directly used in acoustic measurement, without relying on anechoic chamber positioning device, and laser positioning can be realized in anechoic chamber, with high accuracy.

Description

Technical Field

[0001] This utility model belongs to the technical field of acoustic calibration, specifically relating to a test sound source for acoustic calibration with positioning function. Background Technology

[0002] Test sound sources are commonly used standard devices in the field of acoustic calibration. They are generally used to emit standard test sounds of 20Hz to 20kHz to a specified location inside an anechoic chamber or anechoic box. They are usually used in conjunction with a reference microphone to perform calibration using substitution or comparison methods.

[0003] Existing calibration methods, such as JJF 1520-2015 "Calibration Specification for Acoustic Head and Torso Simulators", JJG188-2017 "Verification Procedure for Sound Level Meters", and JJG 1172-2019 "Verification Procedure for Working Standard Microphones (Free Field Comparison Method)", all require that the reference microphone and the calibrated measuring device be tested separately at the same location, and the measurement is performed by comparing the results. However, the specific method for achieving spatial position reproduction is not specified. The positioning accuracy of the microphone has a significant impact on the calibration results. Existing test sound sources and microphones do not have positioning functions, and it is necessary to rely on anechoic chambers or anechoic boxes to add vertical lines or laser positioning devices to complete the calibration. For anechoic chambers or anechoic boxes without pre-set positioning functions, the calibration uncertainty is very large.

[0004] In addition, the positioning device reserved in the anechoic chamber or anechoic box requires the test sound source to be fixed in the installation position of the anechoic chamber or anechoic box and not to change. Once the position of the test sound source or the object under test changes, or the shape of the object being calibrated changes, it is necessary to remeasure and adjust, which is a very cumbersome process and has low work efficiency. Utility Model Content

[0005] To address the aforementioned technical problems, this invention provides a test sound source for acoustic calibration with a positioning function. By installing a laser positioning device and a positioning scale on the test sound source, positioning at any spatial location within an anechoic chamber or anechoic box can be achieved. For anechoic chambers or anechoic boxes without a positioning device, measurements can also be performed using the free field comparison method or the substitution method.

[0006] Technical solution An acoustic calibration test sound source with positioning function includes a first laser, a second laser, and a third laser capable of emitting cross-shaped rays. The first laser is positioned on a vertical plane where the reference axis of the sound center of the test sound source is located, and the third laser is positioned on a horizontal plane where the reference axis of the sound center of the test sound source is located. The vertical rays of the second laser and the first laser coincide, so that the distance between the test point of the device under calibration and the sound center of the test sound source is the required calibration distance. All the vertical rays intersect with the horizontal rays of the third laser, and their intersection points coincide with the test points, thereby achieving positioning indication of the device under calibration.

[0007] Furthermore, the horizontal ray of the third laser and the vertical ray of the first and second lasers are all perpendicular to the reference axis of the sound center, and the horizontal ray of the third laser is at the same height as the reference axis of the sound center.

[0008] Furthermore, a cross-shaped positioning scale is provided on the side of the test sound source opposite to the device being calibrated. The horizontal line of the positioning scale is at the same height as the reference axis, and both its horizontal and vertical lines are perpendicular to the reference axis. The intersection point of the scale coincides with the projection point of the reference axis on the side of the device being calibrated opposite to the device being calibrated. The first laser is positioned on the plane containing the vertical line and the reference axis, and the third laser is positioned on the plane containing the horizontal line and the reference axis.

[0009] Furthermore, the test sound source is configured as a rectangular speaker box, with the first laser and the second laser positioned on the top surface of the test sound source, and the first laser positioned on the vertical plane where the vertical line of the marking positioning scale is located. The third laser is positioned on the side of the test sound source and on the horizontal plane where the horizontal line of the positioning scale is located.

[0010] Furthermore, the vertical light beam from the first laser passes through the vertical line of the marking and positioning scale, and the horizontal light beam from the third laser passes through the horizontal line of the marking and positioning scale.

[0011] Furthermore, the position of the second laser is adjustable, and by adjusting the position of the second laser, its vertical light beam can be made to coincide with the vertical light beam of the first laser.

[0012] Technical effect 1. The test sound source of this utility model has a built-in positioning scale and laser, which can be directly used to locate the test point of the equipment being calibrated during acoustic metrology. It does not rely on the positioning device of the anechoic chamber or anechoic box, and laser positioning can be achieved in the anechoic chamber or anechoic box. The calibration accuracy is high. The positioning can change synchronously with the installation change of the test sound source. Therefore, the movement of the test sound source will not affect the metrology results.

[0013] 2. By setting a first laser on the vertical plane of the reference axis of the sound source's sound center and a third laser on the horizontal plane of the reference axis, and by adjusting the second laser so that its vertical beam coincides with the vertical beam of the first laser, the distance between the device under test and the sound source meets the calibration requirements. Then, the intersection of the horizontal beam of the third laser and the vertical beams of the other two lasers is made to coincide with the test point, which serves as the positioning indicator point. In this way, as long as the test point of the device under test is placed at this positioning indicator point, the distance between the device under test and the sound source can be adjusted, thereby greatly reducing the complexity of operation and improving work efficiency. At the same time, compared with manual positioning of the test point, laser positioning is more accurate and more practical.

[0014] In summary, by using the test sound source of this utility model, the calibration accuracy and convenience of the free field substitution method or comparison method in acoustic metrology can be improved, and the positioning of the device being calibrated in space can be quickly completed by relying on the test sound source. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the positioning scale on the speaker of the device being calibrated according to this utility model; Figure 3 This is a schematic diagram of the light projection of the first, second, and third lasers of this utility model onto the microphone of the device being calibrated. Detailed Implementation

[0016] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

[0017] like Figure 1As shown, this utility model provides a test sound source for acoustic calibration with positioning function, including a first laser, a second laser, and a third laser capable of emitting cross-shaped rays. The first laser is set on the vertical plane where the reference axis of the sound center of the test sound source is located, and the third laser is set on the horizontal plane where the reference axis of the sound center of the test sound source is located. The vertical rays of the second laser and the first laser coincide, so that the distance between the test point of the device under calibration and the sound center of the test sound source is the required calibration distance. The vertical rays all intersect with the horizontal rays of the third laser, and their intersection point coincides with the test point, so as to realize the positioning indication of the device under calibration. In this way, by using the vertical beams of the first and second lasers, the distance between the test point and the sound center of the test sound source meets the calibration requirements. Furthermore, since the intersection of the horizontal beam of the third laser and the vertical beams of the other two lasers coincides with the test point, this serves as a positioning indicator. After the device being calibrated is replaced, as long as the test point of the new device coincides with the positioning indicator, there is no need to readjust the relative position between the test sound source and the device being calibrated. This greatly reduces the complexity of the operation and improves work efficiency. At the same time, compared with manual positioning of the test point, laser positioning is more accurate and more practical.

[0018] Specifically as follows: The horizontal beam of the third laser and the vertical beams of the first and second lasers are all perpendicular to the reference axis of the sound center, with the horizontal beam of the third laser at the same height as the reference axis. This ensures that the device under test is on the extension line of the reference axis of the sound center of the test sound source. The position of the second laser is adjustable and not fixed initially. Adjusting the position of the second laser according to the required calibration distance ensures that its vertical beam coincides with the vertical beam of the first laser, guaranteeing that the distance between the device under test and the sound center meets the calibration requirements. Finally, the intersection of the horizontal beam of the third laser and the vertical beams of the other two lasers is used as the positioning indicator point, aligning it with the test point of the device under test. This completes the position adjustment between the device under test and the test sound source. The entire operation is simple and efficient. Therefore, when the device under test is replaced, its shape changes, or the test point position changes, simply placing the new test point at the positioning indicator point allows for position adjustment between the test sound source and the device under test, enabling subsequent calibration work.

[0019] To facilitate determining the precise positions of the first, second, and third lasers on the test sound source, a cross-shaped positioning scale can be installed on the side of the test sound source opposite to the device under test. The horizontal line of this positioning scale is at the same height as the reference axis of the sound center, and both its horizontal and vertical lines are perpendicular to the reference axis of the sound center. The intersection of these lines coincides with the projection point of the reference axis on the side of the device under test. The first laser can be placed on the plane containing the vertical line and the reference axis, the third laser can be placed on the plane containing the horizontal line and the reference axis, and the second laser can be set according to the distance requirements between the device under test and the test sound source. This allows us to determine the positions of the three lasers on the test sound source.

[0020] For example, the test sound source is set to a speaker with a rectangular structure, such as... Figure 1 As shown, the reference axis is the central axis of the speaker, i.e., the horizontal line. The device being calibrated is a microphone. The first laser can be set on the top surface of the test sound source, on the vertical plane where the vertical line of the positioning scale is located, and its vertical light rays pass through the vertical line of the positioning scale. The third laser can be set on the side of the test sound source, on the horizontal plane where the horizontal line of the positioning scale is located, and its horizontal light rays pass through the horizontal line of the positioning scale. The second laser can also be set on the top surface of the test sound source, at a position where the distance between the device being calibrated and the speaker meets the calibration requirements, such as 1 meter, so that the vertical light rays of the second laser coincide with the vertical light rays of the first laser, thereby determining the position of the second laser on the top surface of the test sound source.

[0021] When using the acoustic calibration test sound source with positioning function of this utility model for calibration, the microphone is calibrated using a rectangular speaker box. First, a cross-shaped positioning scale is drawn on the side of the test sound source opposite to the device being calibrated, such as... Figure 2 As shown, find the intersection of the vertical line of the positioning scale and the plane containing the reference axis of the test sound source with the top surface of the test sound source. Place the first laser on this intersection line, ensuring its vertical light beam crosses the vertical line. Then, find the intersection of the horizontal line of the positioning scale and the plane containing the reference axis of the test sound source with the side surface of the test sound source. Place the third laser on this intersection line, ensuring its horizontal light beam crosses the horizontal line. Using the distance between the calibrated device and the test sound source meeting the calibration requirements, align the vertical light beam of the second laser with the vertical light beam of the first laser to determine the position of the second laser on the test sound source speaker. Finally, use the intersection of the horizontal light beam of the third laser with the vertical light beams of the other two lasers as the positioning indicator point. Figure 3 As shown, simply place the test point of the device to be calibrated at the positioning indicator point, and then perform calibration on the device according to the calibration specifications.

[0022] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples. Various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the scope of protection of the present invention is defined by the appended claims.

Claims

1. A test sound source for acoustic calibration with positioning function, characterized in that: The device includes a first laser, a second laser, and a third laser capable of emitting cross-shaped rays. The first laser is positioned on a vertical plane where the reference axis of the sound center of the test sound source is located, and the third laser is positioned on a horizontal plane where the reference axis of the sound center of the test sound source is located. The vertical rays of the second laser and the first laser coincide, so that the distance between the test point of the device under test and the sound center of the test sound source is the required calibration distance. All the vertical rays intersect with the horizontal rays of the third laser, and their intersection points coincide with the test points, thereby achieving positioning indication of the device under test.

2. The acoustic calibration test sound source with positioning function according to claim 1, characterized in that: The horizontal ray from the third laser and the vertical ray from the first and second lasers are all perpendicular to the reference axis of the sound center, and the horizontal ray from the third laser is at the same height as the reference axis of the sound center.

3. The acoustic calibration test sound source with positioning function according to claim 2, characterized in that: A cross-shaped positioning scale is provided on the side of the test sound source opposite to the device being calibrated. The horizontal line of the positioning scale is at the same height as the reference axis, and both the horizontal and vertical lines are perpendicular to the reference axis. The intersection point of the scale coincides with the projection point of the reference axis on the side of the device being calibrated. The first laser is positioned on the plane containing the vertical line and the reference axis, and the third laser is positioned on the plane containing the horizontal line and the reference axis.

4. The acoustic calibration test sound source with positioning function according to claim 3, characterized in that: The test sound source is configured as a rectangular speaker box. The first laser and the second laser are located on the top surface of the test sound source, and the first laser is located on the vertical plane where the vertical line of the marking positioning scale is located. The third laser is positioned on the side of the test sound source and on the horizontal plane where the horizontal line of the positioning scale is located.

5. The acoustic calibration test sound source with positioning function according to claim 4, characterized in that: The vertical beam of the first laser passes through the vertical line of the marking and positioning scale, and the horizontal beam of the third laser passes through the horizontal line of the marking and positioning scale.

6. The acoustic calibration test sound source with positioning function according to claim 1, characterized in that: The position of the second laser is adjustable, and by adjusting the position of the second laser, its vertical light beam can be made to coincide with the vertical light beam of the first laser.

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