A loudspeaker three-dimensional directivity measuring device

Abstract

The utility model discloses a loudspeaker three -dimensional directivity measuring device, and the device includes the revolving stage, the sound box and the microphone, and the sound box sets up with the revolving stage, and the microphone is with the sound box as the center and is provided with a plurality of 90 degree arc shapes, and with the sound box as the original point, with the arc plane as XOZ plane, and the two microphones of outermost side are located on X -axis and Z -axis, the revolving stage can rotate 360 degrees around Z -axis in horizontal direction, and the rotation interval is 5 degrees each time. After using the microphone to gather the sound box impulse response, and through mirror image, the whole 180 degree longitudinal parameter can be obtained, and a total of 72 times parameter test obtains the sound box three -dimensional original curve. The utility model increases the microphone, and makes the test speed to accelerate 37 times, and the utility model does not need longitudinal rotation, reduces the requirement to revolving stage, and ordinary horizontal shaft revolving stage can satisfy the requirement.

Description

Technical Field

[0001] This utility model belongs to the field of professional audio speaker parameter acquisition, and in particular relates to a three-dimensional directivity measurement device for loudspeakers. Background Technology

[0002] Current methods for acquiring the 3D parameters of a speaker typically involve using a three-axis turntable to rotate the speaker, then rotating it in space at 5° intervals, and using a microphone to collect signals and calculate the speaker's 3D parameters. Generally, 2664 data points are needed: (360 / 5) × (180 / 5 + 1) = 2664. Figure 1 A commonly used 3D parameter measurement device is the ELF turntable from FOURAUDIO, which uses a 2-axis measurement system. Because it requires 2664 data points to collect a large amount of data, the measurement speed is slow. For heavy speakers, the turntable is troublesome due to the increased load, especially since speakers are getting heavier and heavier. Either the turntable is very expensive, or the turntable measures a speaker weight that is too light, with a maximum weight of only 50kg. It is not easy to measure speakers weighing more than 50kg. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a three-dimensional directivity measurement device for loudspeakers.

[0004] The objective of this invention is achieved through the following technical solution: a three-dimensional directivity measuring device for loudspeakers, comprising: Turntable; The speaker is mounted on the turntable; Multiple microphones are arranged in a 90° arc around the speaker. With the speaker as the origin and the plane of the arc as the XOZ plane, the two outermost microphones are located on the X and Z axes.

[0005] Furthermore, 19 microphones are provided, arranged at equal intervals along the arc.

[0006] Furthermore, the turntable is capable of rotating 360° around the Z-axis in the horizontal direction, with each rotation interval being 5°.

[0007] Furthermore, the microphone is mounted on a lifting bracket, allowing for height adjustment.

[0008] The beneficial effects of this utility model are: 1. Compared with the existing technology, the device designed in this utility model adds a microphone, which speeds up the testing speed by 37 times.

[0009] 2. Compared with the prior art, this utility model does not require longitudinal rotation, which reduces the requirements for the turntable. A common horizontal axis turntable can meet the requirements. Attached Figure Description

[0010] Figure 1 It is a traditional three-dimensional parameter measurement device.

[0011] Figure 2 This invention relates to a three-dimensional directivity measuring device for loudspeakers. Figure 3 A schematic diagram of the microphone arrangement for a loudspeaker three-dimensional directivity measurement device; Figure 4 A schematic diagram of the turntable and speaker enclosure arrangement for a loudspeaker three-dimensional directivity measurement device; Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the single embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0013] like Figure 2-4 As shown, this utility model provides a three-dimensional directivity measurement device for loudspeakers. According to the AES56-2008 standard for the measurement of three-dimensional directivity of loudspeakers in speaker cabinet measurement, if it is necessary to test the three-dimensional directivity of loudspeakers, the loudspeaker needs to be rotated on three axes and 2664 points need to be measured. This utility model uses a simplified device, selects multi-microphone measurement on one axis, selects only the Z-axis rotation, and uses a mirror method in the horizontal direction. As long as the speaker is rotated 360° in the horizontal direction, a total of 73 data acquisitions can be performed to obtain the three-dimensional directivity measurement of the loudspeaker.

[0014] In this utility model, there is a height-adjustable lifting bracket 1, on which 19 microphones 2 are arranged at equal intervals, arranged in a 90-degree arc with the speaker 3 as the center, with the speaker 3 as the origin, and the plane of the arc as the XOZ plane, and the two outermost microphones are located on the X-axis and Z-axis.

[0015] The specific implementation method of this utility model is as follows: Nineteen microphones were used to collect the speaker's impulse response, and the entire 180° longitudinal parameters could be obtained through mirroring. The turntable 4 was automatically controlled to rotate the speaker around the Z-axis in the horizontal plane, and the speaker parameters were measured every 5°. A total of 73 parameters were tested to obtain the speaker's three-dimensional original curve.

[0016] The above embodiments are used to explain and illustrate the present utility model, and are not intended to limit the present utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A three-dimensional directivity measuring device for loudspeakers, characterized in that, The device includes: Turntable; The speaker is mounted on the turntable; Multiple microphones are arranged in a 90° arc around the speaker. With the speaker as the origin and the plane of the arc as the XOZ plane, the two outermost microphones are located on the X and Z axes.

2. The loudspeaker three-dimensional directivity measuring device according to claim 1, characterized in that, Nineteen microphones are provided and arranged at equal intervals along an arc.

3. The loudspeaker three-dimensional directivity measuring device according to claim 1, characterized in that, The turntable can rotate 360° around the Z-axis in the horizontal direction, with each rotation interval being 5°.

4. The loudspeaker three-dimensional directivity measuring device according to claim 1, characterized in that, The microphone is mounted on a height-adjustable support.

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