CN-117395588-A - Sound field testing method and system for directional sound production equipment

CN117395588ACN 117395588 ACN117395588 ACN 117395588ACN-117395588-A

Abstract

The invention discloses a sound field testing method and a sound field testing system of directional sound production equipment, wherein the method comprises the steps of setting a testing range which at least covers a sound production surface of the directional sound production equipment, wherein the testing range comprises a plurality of testing points; the corresponding test data are obtained by carrying out sweep frequency test on all test points one by one; and reading the test data in real time, and generating a sound field distribution diagram according to the test data in real time. According to the invention, the sound energy distribution of the directional sound production equipment in the plane or the space is tested, and the sound field distribution situation is visually displayed in an image form, so that the sound field distribution situation, the uniformity of the sound field, the deflection direction of sound waves and the like can be intuitively obtained from the image, and the method has important reference significance for performance analysis, verification and improvement of the directional sound production equipment.

Inventors

PAN HAO
GU ZHENRONG
NIU ZHIQIANG
MAO JUNWEI

Assignees

AUDFLY TECH CO LTD

Dates

Publication Date: 20240112
Application Date: 20231211
Priority Date: 20231211

Claims (10)

1. A method of sound field testing of a directional sound emitting device, the method comprising: s1, setting a test range which at least covers a sound emitting surface of directional sound emitting equipment, wherein the test range comprises a plurality of test points; s2, carrying out sweep frequency test on all the test points one by one to obtain corresponding test data; s3, the test data are read in real time, and a sound field distribution diagram is generated in real time according to the test data, wherein the sound field distribution diagram is used for displaying the distribution condition of the sound field in the test range.
2. The sound field testing method of a directional sound generating apparatus according to claim 1, wherein the testing range is a two-dimensional testing plane or a three-dimensional testing space.
3. The sound field testing method of a directional sound emitting apparatus according to claim 2, wherein when the test range is a two-dimensional test plane, the setting of the test range in S1 includes: s11, determining the position of the test plane by determining the characteristic parameters of the test plane, wherein the characteristic parameters comprise the vertex position of the test plane or the circle center and the radius of the test plane; s12, resetting the position of the test point in the test plane.
4. The sound field testing method of directional sound generating apparatus according to claim 3, wherein when the testing range is a three-dimensional testing space, the setting the testing range in S1 further comprises: s13, resetting a plurality of test positions in the direction perpendicular to the test plane.
5. The sound field testing method of directional sounding apparatus of claim 4, wherein when the testing range is a two-dimensional testing plane, the step S2 comprises the step S21 of performing sweep frequency test on all the testing points in the testing plane one by one according to a set testing path, obtaining point testing data corresponding to the testing points every time one testing point is tested, and forming the testing data of one testing plane by all the point testing data.
6. The method for testing the sound field of directional sound equipment according to claim 5, wherein when said testing range is a three-dimensional space, said S2 further comprises S22, after testing one testing plane, sequentially moving to each of said testing positions perpendicular to said testing plane, and repeatedly executing said S21 at each of said testing positions, thereby obtaining test data of a plurality of testing planes, said test data of a plurality of testing planes constituting test data of said space.
7. The sound field testing method of a directional sound emitting apparatus as claimed in claim 1, wherein said S3 comprises: and obtaining a pixel map of a corresponding number of pixel points from the test data, amplifying the pixel map by adopting a numerical calculation method, coloring the amplified pixel map, and marking different colors for the pixel points with different sound pressure levels, thereby generating the sound field distribution map by marking the distribution condition of a sound field within a test range by using colors.
8. A sound field testing system for a directional sound emitting device, the system comprising: the control device is used for setting a test range which at least covers the sound emitting surface of the directional sound emitting device, and the test range comprises a plurality of test points; the test equipment is connected with the control equipment and is fixedly provided with a pickup equipment, and the pickup equipment is used for driving the pickup equipment to each test point of the test range to pick up sound of the directional sound equipment after the control equipment sets the test range; the electric cabinet is connected with the testing equipment and is used for carrying out sweep frequency testing on sound signals obtained by pickup of the pickup equipment to obtain corresponding testing data, reading the testing data in real time and generating a sound field distribution diagram in real time according to the testing data, wherein the sound field distribution diagram is used for displaying the distribution condition of sound fields in the testing range.
9. The sound field testing system of directional sound production equipment according to claim 8, wherein the testing equipment comprises an X-axis module, a Z-axis module and a Y-axis module, the sound pickup equipment is slidably connected with the Z-axis module, and moves back and forth along the Z-axis direction under the driving of the Z-axis module; the Z-axis module is connected with the X-axis module in a sliding way and drives the pickup device to move back and forth along the X-axis direction; the X-axis module is in sliding connection with the Y-axis module, the X-axis module and the pick-up equipment are driven to integrally move back and forth along the X-axis direction, each shaft module comprises a driving motor and a sliding assembly connected with the driving motor, and the driving motor is connected with the control equipment.
10. The sound field testing system of directional sound production equipment according to claim 8, wherein the electric cabinet comprises an audio analyzer and a sound field image generating system, the audio analyzer is used for carrying out sweep frequency test on sound signals obtained by pickup of the sound pickup equipment to obtain corresponding test data; the audio analyzer is used for reading the test data in real time, obtaining pixel images of a corresponding number of pixel points from the test data, amplifying the pixel images by adopting a numerical calculation method, coloring the amplified pixel images, and marking different colors on the pixel points with different sound pressure levels, so as to generate the sound field distribution diagram of the distribution condition of the sound field in the test range marked by the colors.

Description

Sound field testing method and system for directional sound production equipment Technical Field The invention relates to the technical field of sound field testing, in particular to a sound field testing method of directional sound production equipment. Background Ultrasonic transducers refer to devices that convert electrical energy into acoustic energy, which can form a specific sound field distribution in a certain three-dimensional space. The distribution of the sound field of the ultrasonic transducer is related to the factors such as the shape, the size, the material, the frequency and the like of the transducer, and the sound beam shows complex sound field distribution characteristics under the influence of sound wave directivity, diffusion angle, interference and the like in a near field region and a far field region; on the other hand, in order to meet different detection requirements, ultrasonic transducer technologies and types are widely developed, such as planar unfocused transducers, point focused transducers, line focused transducers, phased array transducer arrays and the like, and different types of transducers have radiation sound fields with different characteristics, so that the sound fields of the ultrasonic transducers are intuitively and accurately tested, and the ultrasonic transducer has important significance in improving the performance of the transducers, understanding the sound production characteristics of the transducers and the like. However, the existing testing method of the ultrasonic transducer needs to build a complex and expensive testing system, and also cannot visually measure the sound field distribution of the sound field of the transducer, so that a novel sound field testing scheme is necessary to be provided to overcome the technical problems existing in the existing testing method. Disclosure of Invention The invention aims to provide a sound field testing method and system of directional sound equipment. In order to achieve the above object, in one aspect, the present invention provides a sound field testing method for a directional sound generating device, including: s1, setting a test range which at least covers a sound emitting surface of directional sound emitting equipment, wherein the test range comprises a plurality of test points; s2, carrying out sweep frequency test on all the test points one by one to obtain corresponding test data; s3, the test data are read in real time, and a sound field distribution diagram is generated in real time according to the test data, wherein the sound field distribution diagram is used for displaying the distribution condition of the sound field in the test range. In a preferred embodiment, the test range is a two-dimensional test plane or a three-dimensional test space. In a preferred embodiment, when the test range is a two-dimensional test plane, the setting the test range in S1 includes: s11, determining the position of the test plane by determining the characteristic parameters of the test plane, wherein the characteristic parameters comprise the vertex position of the test plane or the circle center and the radius of the test plane; s12, resetting the position of the test point in the test plane. In a preferred embodiment, when the test range is a three-dimensional test space, the setting the test range in S1 further includes: s13, resetting a plurality of test positions in the direction perpendicular to the test plane. In a preferred embodiment, when the test range is a two-dimensional test plane, the step S2 includes step S21 of performing sweep frequency test on all the test points in the test plane one by one according to a set test path, and obtaining point test data corresponding to the test points after each test point is tested, where all the point test data form the test data of one test plane. In a preferred embodiment, when the test range is a three-dimensional test space, the step S2 further includes step S22 of sequentially moving to each of the test positions perpendicular to the test plane after one test plane is tested, and repeating the step S21 at each test position to obtain test data of a plurality of test planes, where the test data of the plurality of test planes form test data of the three-dimensional test space. In a preferred embodiment, the step S3 includes: and obtaining a pixel map of a corresponding number of pixel points from the test data, amplifying the pixel map by adopting a numerical calculation method, coloring the amplified pixel map, and marking different colors for the pixel points with different sound pressure levels, thereby generating the sound field distribution map by marking the distribution condition of a sound field within a test range by using colors. In another aspect, the present invention provides a sound field testing system for a directional sound emitting device, including: the control device is used for setting a test range which at least covers the sound emit