CN210858107U

CN210858107U - Microphone acoustics test complete anechoic chamber

Info

Publication number: CN210858107U
Application number: CN201920628010.8U
Authority: CN
Inventors: 曹伟; 姜博; 李百儆; 张威
Original assignee: Dongguan Iac Acoustics Equipment Co ltd
Current assignee: Dongguan Iac Acoustics Equipment Co ltd
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2020-06-26
Anticipated expiration: 2029-05-05

Abstract

The utility model discloses a complete anechoic room of microphone acoustic test, including the sound insulating board, the sound insulating board upper end is provided with wedge string groove, wedge string groove upper end is provided with the wedge, an inner wall adjacent sound insulation jacket wiring board and the sound base of being provided with in the sound insulating board, sound base one end with sound insulating board fixed connection, the stereo set has been placed to sound base upper end, the sound base is provided with the support outward, the support both ends with sound insulating board fixed connection, be fixed with the microphone removal frame on the support. Compared with the prior art, the utility model has the advantages of structural configuration is simple, and is small, and the quality is light, and the sound insulation is effectual, and the measuring accuracy is higher, accords with the test requirement of national sound field, and the cost is lower, economical and practical, and adaptability is stronger.

Description

Microphone acoustics test complete anechoic chamber

Technical Field

The utility model relates to an acoustics test technical field, in particular to microphone acoustics test complete anechoic chamber.

Background

With the improvement of living standard, the microphone becomes visible everywhere, and the requirements of users on the microphone are not only usable, but also increasingly stringent, so that the requirements on the performance and the tone quality of the microphone are more and more important, the testing and debugging of the acoustic performance of the microphone are particularly important, and the quality of the testing and debugging results directly influence the acceptance of customers on microphone products and brands. At present, a more mature test scheme is a sound insulation room or a foam wedge type anechoic chamber.

The anechoic chamber produces a typical sound field environment during acoustic measurements, i.e. a free sound field (direct sound only, no reflected sound). In order to make the indoor condition of the anechoic chamber approach to a free sound field, a sound absorption structure (generally a common wedge) needs to be installed indoors, and the sound absorption coefficient above the cut-off frequency in the anechoic chamber is larger than 0.99. The complete anechoic chamber is provided with sound-absorbing wedges on six surfaces in the chamber, and a six-surface complete-absorption complete-free sound field is provided in an acoustic test.

However, in the practical use of the anechoic chamber, the anechoic chamber is often restricted by some factors, for example, the occupied area of the full anechoic chamber is large, the manufacturing cost is high, the foam wedge needs to be additionally arranged in the simple anechoic chamber, but the sound insulation effect is unstable, the test precision of a sound field is not high, the wiring of the full anechoic chamber is complicated, and the fireproof performance is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a complete anechoic room of microphone acoustics test to the simple and easy anechoic room effect of mentioning in solving the background art is poor, and the complete anechoic room takes up an area of great, the problem of the cost is higher, the performance is unstable.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a full anechoic room of microphone acoustics test, includes the acoustic baffle, the acoustic baffle upper end is provided with wedge string groove, wedge string groove upper end is provided with the wedge, an inner wall the sound insulation jacket wiring board and sound base are adjacently provided with in the acoustic baffle, sound base one end with acoustic baffle fixed connection, the stereo set has been placed to sound base upper end, the sound base is provided with the support outward, the support both ends with acoustic baffle fixed connection, be fixed with the microphone on the support and remove the frame. The utility model discloses in, the stereo set can be customized according to customer's demand.

In order to ensure the sound field testing precision and the sound insulation effect, the sound insulation plate further comprises an outer plate and an inner plate, a framework is arranged between the outer plate and the inner plate, and sound absorption cotton is filled in the sound insulation plate.

In order to guarantee sound field test accuracy and guarantee the sound insulation effect, it is further, the wedge includes the perforated plate, two liang of interconnect of perforated plate is in the same place, the periphery of perforated plate is fixed with the non-woven fabrics, the wedge is inside to be stuffed with the sound absorption cotton, the perforated plate bottom is provided with the couple.

In order to ensure the sound field testing precision and the sound insulation effect, the microphone moving frame further comprises a sliding rail slider and a tray, the tray is fixed at the upper end of the sliding rail slider, and the sliding rail slider is connected with the support in a sliding manner.

In order to ensure the sound insulation effect, the lower end of the sound insulation plate on the ground of the full-anechoic chamber is further provided with a vibration damping pad. The utility model discloses in, the system of building has been built to the floating to damping pad 9 for isolated frequency is at the influence of the vibration of more than 10Hz to the anechoic chamber.

Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are as follows:

(1) the utility model has small volume and light weight, can be suitable for floors with limited load such as office buildings and offices, and has strong adaptability;

(2) the utility model has simple and effective indoor and outdoor wiring structure layout, good sound insulation effect, higher sound field test precision of the complete anechoic chamber, and accordance with the test requirements of national sound field;

(3) the utility model discloses compact structure, the cost is lower, economical and practical.

Drawings

Fig. 1 is a schematic top view of the cross-sectional structure of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure A-A of the present invention;

fig. 3 is a schematic sectional structure view of the sound insulation board 4 of the present invention;

fig. 4 is a schematic front view of wedge 2 of the present invention;

fig. 5 is a schematic side view of wedge 2 of the present invention;

fig. 6 is a schematic top view of wedge 2 according to the present invention.

In the figure:

1. f, groove; 2. a wedge; 3. a wedge hanging groove; 4. a sound insulation plate; 5. a sound insulation jacket wiring board; 6. sounding; 7. a sound base; 8. a microphone moving stand; 9. a vibration damping pad; 10. h groove; 11. a slide rail slider; 12. a support; 13. a tray; 14. an outer plate; 15. a framework; 16. sound absorbing cotton; 17. An inner plate; 18. a perforated plate; 19. hooking; 20. non-woven fabrics; 21. silencing chamber door.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: the utility model provides a full anechoic room of microphone acoustics test, including acoustic baffle 4, acoustic baffle 4 is fixed on the indoor wall of full anechoic room, 4 upper ends of acoustic baffle are provided with wedge string groove 3, wedge string groove 3 upper ends are provided with wedge 2, the adjacent sound insulation jacket wiring board 5 and the sound base 7 that are provided with in the acoustic baffle 4 of an inner wall, 7 one end of sound base and 4 fixed connection of acoustic baffle, stereo set 6 has been placed to sound base 7 upper end, sound base 7 is provided with support 12 outward, 12 both ends of support and 4 fixed connection of acoustic baffle, and the support is fixed with microphone removal frame 8 on 12, and stereo set 6 can be customized according to customer's demand.

In this embodiment, the sound insulation board 4 links together through F groove 1, H groove 10 and rivet and microphone acoustics test total anechoic chamber's major structure, and wedge hanging groove 3 has chooseed for use galvanized sheet metal component, and wedge 2 material is the aluminum alloy, and sound base 7 is the stainless steel sheet metal component that thickness is 3 mm. The sound insulation jacket wiring board 5 and the support 12 are fixed on the sound insulation board 4 through cross countersunk head screws, and the sound equipment base 7 is fixed on the sound insulation board 4 through self-tapping screws.

In order to ensure the sound field testing precision and the sound insulation effect, the sound insulation plate 4 further comprises an outer plate 14 and an inner plate 17, a framework 15 is arranged between the outer plate 14 and the inner plate 17, and sound absorption cotton 16 is filled in the sound insulation plate 4.

In this embodiment, the outer panel 14 is made of a galvanized steel sheet with a thickness of 1.0mm, the inner panel 17 is made of a galvanized steel sheet with a thickness of 0.8mm, the frame 15 is made of a bent piece of a galvanized steel sheet with a thickness of 0.8mm, and the sound absorption cotton 16 is made of 40kg/m³And (4) centrifuging the glass wool. The outer panel 14 is fixed to the inner panel 17 by butt welding and blind riveting via the framework 15.

In order to guarantee the sound field test precision and guarantee the sound insulation effect, further, wedge 2 includes perforated plate 18, and perforated plate 18 two-by-two interconnect is in the same place, and perforated plate 18 inboard is fixed with non-woven fabrics 20, and wedge 2 is filled with absorbent cotton 16, and perforated plate 18 bottom is provided with couple 19.

In this embodiment, the perforated plate 18 is an aluminum alloy perforated plate with a thickness of 0.7mm, the perforation rate is 32%, and the hook 19 is a galvanized plate bending piece with a thickness of 2 mm. The perforated plate 18 is connected with the hook 19 through a rivet, and the perforated plate 18 is bonded with the non-woven fabric 20 through glue in the perforated plate 18.

In order to ensure the sound field testing precision and the sound insulation effect, the microphone moving frame 8 further comprises a sliding rail sliding block 11 and a tray 13, the tray 13 is fixed at the upper end of the sliding rail sliding block 11, and the sliding rail sliding block 11 is connected with the support 12 in a sliding mode. In this embodiment, a stainless steel slide block and a wooden tray are selected.

In order to ensure the sound insulation effect, the lower end of the sound insulation plate 4 on the ground of the full anechoic chamber is further provided with a vibration damping pad 9. In the present embodiment, a VF damping pad with a thickness of 25mm is selected as the damping pad 9.

In this embodiment, the sound insulation board 4 constitutes the main body of the microphone acoustical test total anechoic chamber, so as to ensure good sound insulation performance, the wedge 2 of the aluminum alloy greatly increases the sound absorption performance of the microphone acoustical test total anechoic chamber, the sound insulation jacket wiring board 5 provides a signal transfer port, the sound box 6 provides a sound source, the microphone moving frame 8 can ensure that the centers of the sounding body and the receiving body are in the same horizontal plane, the vibration damping pad 9 constructs a floating construction system of the total anechoic chamber, and the influence of the vibration with the frequency of more than 10Hz on the sound insulation chamber can be isolated.

Although preferred embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a microphone acoustics test complete anechoic chamber, its characterized in that, includes acoustic baffle (4), acoustic baffle (4) upper end is provided with wedge string groove (3), wedge string groove (3) upper end is provided with wedge (2), an inner wall sound insulation jacket wiring board (5) and sound base (7) are provided with to the adjacent in acoustic baffle (4), sound base (7) one end with acoustic baffle (4) fixed connection, stereo set (6) have been placed to sound base (7) upper end, sound base (7) are provided with support (12) outward, support (12) both ends with acoustic baffle (4) fixed connection, be fixed with microphone on support (12) and remove frame (8).

2. The microphone acoustic testing total anechoic chamber of claim 1, wherein: the sound insulation board (4) comprises an outer board (14) and an inner board (17), a framework (15) is arranged between the outer board (14) and the inner board (17), and sound absorption cotton (16) is filled in the sound insulation board (4).

3. The microphone acoustic testing total anechoic chamber of claim 2, wherein: wedge (2) are including perforated plate (18), two liang of interconnect of perforated plate (18) is in the same place, the periphery of perforated plate (18) is fixed with non-woven fabrics (20), non-woven fabrics (20) inside is clogged has sound absorption cotton (16), perforated plate (18) bottom is provided with couple (19).

4. The microphone acoustic testing total anechoic chamber of claim 3, wherein: microphone remove frame (8) include slide rail slider (11) and tray (13), tray (13) are fixed slide rail slider (11) upper end, slide rail slider (11) with support (12) sliding connection.

5. The microphone acoustic testing total anechoic chamber of claim 1, wherein: the lower end of the sound insulation plate (4) on the ground of the complete anechoic chamber is also provided with a vibration damping pad (9).