CN117596536B - Device and method for switching incident angle during microphone frequency weighting test - Google Patents
Device and method for switching incident angle during microphone frequency weighting test Download PDFInfo
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- CN117596536B CN117596536B CN202410071699.4A CN202410071699A CN117596536B CN 117596536 B CN117596536 B CN 117596536B CN 202410071699 A CN202410071699 A CN 202410071699A CN 117596536 B CN117596536 B CN 117596536B
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- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000030279 gene silencing Effects 0.000 claims abstract description 7
- 230000008030 elimination Effects 0.000 claims description 4
- 238000003379 elimination reaction Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000012795 verification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses an incidence angle switching device for a microphone frequency weighting test, which comprises a silencing chamber, wherein a sound source and a test platform are arranged in the silencing chamber, the test platform comprises a rotating base and rotates around a first axis, and the first axis is perpendicular to the sound source axis of the sound source; the bracket rod is arranged along the first axis; the microphone fixing structure is used for fixing the microphone on the bracket rod, and the fixed microphone is positioned on the sound source axis of the sound source; one end of the bracket rod is rotatably connected to the rotary base around a second axis, and the second axis is perpendicular to the sound source axis of the sound source and the first axis. The invention aims to solve the technical problems in the prior art and provides an incident angle switching device and method for a microphone frequency weighting test, which can rapidly realize accurate positioning between a microphone and a sound source of a noise monitor, save test time and improve measurement accuracy.
Description
Technical Field
The invention relates to the technical field of verification equipment of automatic noise detectors, in particular to an incident angle switching device and method during microphone frequency weighting test.
Background
An important one of the noise automatic detector's certification is the certification of the frequency meter (acoustic signal), which is generally recommended in the JJG 1095 environmental noise automatic detector certification protocol to be performed at 90 degrees of incidence, as in fig. 1.
The basic flow of the monitor frequency weighting verification is as follows: firstly, placing a reference microphone and a reference preamplifier according to the requirement of zero-degree incidence, keeping a fixed distance (more than or equal to 1 m) from a sound source, and collecting standard signals; after the acquisition of the standard signals is completed, the reference microphone and the reference preamplifier are replaced by the monitor microphone and the monitor preamplifier, and meanwhile, the angle between the reference microphone and the sound source axis is adjusted to 90 degrees, so that the upper plane of the monitor microphone and the sound source axis are on the same plane, and the axial distance of the monitor microphone and the distance of the sound source are still kept. And acquiring the frequency weighing of the microphone of the monitor after the position adjustment is qualified, and comparing the acquired data with acquired reference microphone data to judge whether the frequency weighing of the monitor is qualified or not.
When the frequency weighting test is performed after the monitor microphone and the monitor preamplifier are replaced, how to adjust the monitor microphone to be perpendicular to the axis of the sound source is required, and the distance between the upper plane of the monitor microphone and the axis of the sound source is required to be adjusted to coincide, so that accurate position adjustment is difficult in the anechoic chamber. In addition, through practical verification, if the monitor microphone cannot be guaranteed to be perpendicular to the sound source axis in the same plane (namely, 90-degree included angle), larger errors can be generated in high-frequency weighting verification.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the technical problems in the prior art and provides an incident angle switching device and method for a microphone frequency weighting test, which can rapidly realize accurate positioning between a microphone and a sound source of a noise monitor, save test time and improve measurement accuracy.
2. Technical proposal
In order to solve the problems, the technical scheme provided by the invention is as follows:
the utility model provides an incident angle auto-change over device when microphone frequency meter weight tests, includes the anechoic room, be equipped with sound source and test platform in the anechoic room, test platform includes rotating base, rotates around first axis, first axis is perpendicular to the sound source axis of sound source; the bracket rod is arranged along the first axis; the microphone fixing structure is used for fixing the microphone on the bracket rod, and the fixed microphone is positioned on the sound source axis of the sound source; one end of the bracket rod is rotatably connected to the rotary base around a second axis, and the second axis is perpendicular to the sound source axis of the sound source and the first axis.
Optionally, a limiting surface is arranged on a side surface of the support rod, and when the limiting surface is abutted with the rotating base, the support rod rotates 90 degrees around the second axis.
Optionally, the rotating base is an electric turntable.
Optionally, a lifting device for controlling the height of the sound source is further arranged in the silencing chamber.
Optionally, a sliding rail parallel to the sound source axis of the sound source is further arranged in the sound elimination chamber, and the sound source and/or the test platform are/is slidably connected to the sliding rail.
Optionally, the method includes the following steps of S1, fixing a reference microphone on the bracket rod through the microphone fixing structure, recording a distance from a connection position of the reference microphone and the bracket rod to the second axis as L1, recording a distance from a front end of the reference microphone to a connection position of the reference microphone and the bracket rod as L2, and adjusting L2 to be equal to L1; s2, after the reference microphone is tested, replacing the reference microphone with a monitor microphone, and recording the distance from the front end of the monitor microphone to the connection position of the reference microphone and the bracket rod as L2 again, wherein after replacement, the L2 is ensured to be equal to L1; and S3, enabling the support rod to rotate 90 degrees around the second axis, enabling the rotating base to rotate 180 degrees around the first axis, and thus completing position adjustment of the monitor microphone.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the incident angle switching device greatly saves the time of calibrating the frequency weight of the noise monitor by adopting the anechoic chamber method, accurately positions the positions of the microphone to be tested and the sound source, improves the accuracy of the test, and eliminates the error of the artificial pair position of the anechoic chamber.
Drawings
FIG. 1 is a schematic diagram of a conventional microphone frequency weighting test device according to the background of the invention;
fig. 2 is a schematic structural diagram of an incident angle switching device for microphone frequency weighting test according to an embodiment of the present invention;
fig. 3 to fig. 5 are schematic structural diagrams of steps of a switching device for switching an incident angle during a microphone frequency weighting test according to an embodiment of the present invention;
1. a sound source; 2. a test platform; 21. a rotating base; 22. a bracket rod; 23. a microphone fixing structure; 3. a slide rail; 4. a sliding table.
Detailed Description
The present invention will be further described in detail with reference to the drawings and the detailed description, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted," "positioned," "secured" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered as being "fixedly connected" to another element, the two elements may be fixed by a detachable connection manner, or may be fixed by a non-detachable connection manner, such as sleeving, clamping, integrally forming, or welding, which may be implemented in the prior art, and thus, the description is not further omitted. When an element is perpendicular or nearly perpendicular to another element, it is meant that the ideal conditions for both are perpendicular, but certain vertical errors may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The terms "first" and "second" as used herein do not denote a particular quantity or order, but rather are used to distinguish one element from another.
Referring to fig. 2-5, the device for switching incident angles during a microphone frequency weighting test according to this embodiment includes a silencing chamber, wherein a sound source 1 and a test platform 2 are disposed in the silencing chamber, the sound source 1 and the test platform 2 are disposed in the silencing chamber at intervals along a sound source axis of the sound source 1, the test platform 2 includes a rotating base 21, and rotates around a first axis, and the first axis is perpendicular to the sound source axis of the sound source 1; a bracket lever 22 disposed along a first axis, the lower end of the bracket lever 22 being rotatably connected to the rotary base 21 about a second axis perpendicular to the sound source axis of the sound source 1 and the first axis; and a microphone fixing structure 23, provided at an upper end of the support rod 22, for fixing a microphone to the support rod 22, the fixed microphone being located on a sound source axis of the sound source 1.
The switching method of the incident angle switching device during the frequency weighting test of the microphone comprises the following steps: s1, fixing a reference microphone on a support rod 22 through a microphone fixing structure 23, recording the distance from the connection position of the reference microphone and the support rod 22 to the second axis as L1, recording the distance from the front end of the reference microphone to the connection position of the reference microphone and the support rod 22 as L2, and adjusting the L2 to be equal to L1; s2, after the reference microphone test is completed, replacing the reference microphone with a monitor microphone, and recording the distance from the front end of the monitor microphone to the connection position of the reference microphone and the support rod 22 as L2 again, wherein after replacement, the L2 is ensured to be equal to L1; s3, as shown in fig. 4, the bracket rod 22 is rotated by 90 degrees around the second axis, as shown in fig. 5, and the rotating base 21 is rotated by 180 degrees around the first axis, so that the position adjustment of the monitor microphone can be completed.
Since the length of L1 is always equal to L2, the distance L3 between the axis of the monitor microphone and the sound source is always unchanged, and it is ensured that the plane on the monitor microphone and the axis of the sound source are on the same plane (i.e., L4 is equal to 0). The frequency weighting test of the monitor microphone can be carried out by opening the sound source, and the method is simple, accurate and efficient.
As an alternative of the present invention, the side surface of the support rod 22 is provided with a limiting surface, when the support rod 22 rotates 90 degrees around the second axis, the limiting surface abuts against the rotating base 21, and at this time, the support rod 22 is parallel to the sound source axis of the sound source 1 and cannot rotate continuously, so as to ensure the rotation angle of the support rod 22.
As an alternative of the present invention, the bracket lever 22 is rotatably connected to the rotation base 21 by a locking screw, and the locking screw may be unscrewed when rotation is required.
As an alternative of the present invention, in order to control the rotation angle of the rotating base 21 conveniently, an automatic control is implemented, and the rotating base 21 is an electric turntable.
As an alternative scheme of the invention, a lifting device for controlling the height of the sound source 1 is further arranged in the sound-deadening chamber, a sliding rail 3 which is arranged parallel to the sound source axis of the sound source 1 is further arranged in the sound-deadening chamber, the sound source 1 and/or the test platform 2 is/are connected to the sliding rail 3 in a sliding way, in this embodiment, the bottom of the test platform 2 is connected to the sliding rail 3 in a sliding way through a sliding table 4, when in switching, as shown in fig. 2, the test platform 2 is moved to the opposite position of the sound source 1, the height of the sound source 1 is adjusted through the lifting device, so that the sound source 1 and the reference microphone are positioned on the same axis, after the distance alignment of the sound centers is completed, the sliding table is adjusted backwards, so that the distance of the L3 is more than or equal to 1m, and through the structure, the reference microphone can be ensured to be positioned on the sound source axis of the sound source 1.
As an alternative of the present invention, the microphone fixing structure is a hoop structure provided on the support rod 22.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (5)
1. An incident angle switching device for microphone frequency weighting test is characterized in that: the test device comprises a sound elimination chamber, wherein a sound source and a test platform are arranged in the sound elimination chamber, and the test platform comprises
A rotating base rotating about a first axis, the first axis being perpendicular to a sound source axis of the sound source;
the bracket rod is arranged along the first axis;
the microphone fixing structure is used for fixing the microphone on the bracket rod, and the fixed microphone is positioned on the sound source axis of the sound source;
one end of the bracket rod is rotatably connected to the rotary base around a second axis, and the second axis is perpendicular to the sound source axis of the sound source and the first axis;
the switching method of the incident angle switching device during the microphone frequency weighting test comprises the following steps of
S1, fixing a reference microphone on a bracket rod through the microphone fixing structure, recording the distance from the connection position of the reference microphone and the bracket rod to the second shaft as L1, recording the distance from the front end of the reference microphone to the connection position of the reference microphone and the bracket rod as L2, and adjusting the L2 to be equal to L1;
s2, after the reference microphone is tested, replacing the reference microphone with a monitor microphone, and recording the distance from the front end of the monitor microphone to the connection position of the reference microphone and the bracket rod as L2 again, wherein after replacement, the L2 is ensured to be equal to L1;
and S3, enabling the support rod to rotate 90 degrees around the second axis, enabling the rotating base to rotate 180 degrees around the first axis, and thus completing position adjustment of the monitor microphone.
2. The device for switching an incident angle during a microphone frequency weighting test according to claim 1, wherein: the side of the support rod is provided with a limiting surface, and when the limiting surface is abutted with the rotating base, the support rod rotates 90 degrees around the second axis.
3. The device for switching an incident angle during a microphone frequency weighting test according to claim 1, wherein: the rotating base is an electric turntable.
4. The device for switching an incident angle during a microphone frequency weighting test according to claim 1, wherein: and a lifting device for controlling the height of the sound source is also arranged in the silencing chamber.
5. The device for switching an incident angle during a microphone frequency weighting test according to any one of claims 1 to 4, wherein: the sound source testing device is characterized in that a sliding rail which is parallel to the sound source axis of the sound source is arranged in the sound elimination chamber, and the sound source and/or the testing platform are/is connected to the sliding rail in a sliding manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410071699.4A CN117596536B (en) | 2024-01-18 | 2024-01-18 | Device and method for switching incident angle during microphone frequency weighting test |
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| CN202410071699.4A CN117596536B (en) | 2024-01-18 | 2024-01-18 | Device and method for switching incident angle during microphone frequency weighting test |
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| CN117596536A CN117596536A (en) | 2024-02-23 |
| CN117596536B true CN117596536B (en) | 2024-04-09 |
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| CN118190146B (en) * | 2024-05-16 | 2024-08-06 | 杭州爱华仪器有限公司 | Frequency weighting adjusting device and method |
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