A noise-canceling microphone

Abstract

The present invention relates to a noise reduction microphone, comprising a cylindrical shell and a sleeve disposed at the front end of the shell, a baffle being integrally disposed transversely in the middle of the inner cavity of the shell, the baffle dividing the inner cavity into a front cavity and a rear cavity, the rear cavity being filled with a rear sound-absorbing sponge, a hollow support rod being inserted in the middle of the rear sound-absorbing sponge, a mounting seat for suspending and mounting a microphone assembly being disposed at the front end of the support rod, a front sound-absorbing sponge being disposed in the front cavity, and the front sound-absorbing sponge being connected to the external environment through the sound inlet of the sleeve. The beneficial effects of the present invention are: simple structure, noise reduction by means of a physical structure, not easy to damage, low cost, and significant noise reduction effect, which greatly simplifies noise reduction measures in places such as customer service centers and saves a large amount of equipment and decoration costs.

Description

Technical Field

[0001] The present invention relates to a microphone, in particular to a noise reduction microphone. Background Art

[0002] Currently, call centers, due to their dense staffing and numerous devices, have numerous sources of noise. The clatter of each agent's keyboard, the operation of electrical systems like air conditioners, and other noise sources all contribute to the noise. When a customer service agent speaks with a customer through a headset, the voices of nearby agents and surrounding background noise are picked up by the microphone and transmitted to the customer's end, often resulting in difficulty for the customer to hear the agent's voice. To eliminate this noise, call centers often install sound-absorbing walls, purchase expensive electronic noise-canceling headsets, and even install specialized silencers. This significantly increases the cost of building a call center, making it unaffordable for small and medium-sized centers. Summary of the Invention

[0003] An object of the present invention is to provide a noise reduction microphone.

[0004] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0005] A noise reduction microphone comprises a cylindrical shell and a sleeve arranged at the front end of the shell, a baffle is arranged in the middle of the inner cavity of the shell laterally, a through hole is arranged in the middle of the baffle, the baffle divides the inner cavity into a front cavity and a rear cavity, the rear cavity is filled with a rear sound-absorbing sponge, the rear end of the rear sound-absorbing sponge is inserted into the microphone wire tube and the front end contacts the baffle, a receiving cavity is arranged in the middle of the rear sound-absorbing sponge, the receiving cavity is connected to the through hole, a hollow support rod is inserted in the middle of the rear sound-absorbing sponge along the axial direction, the front end of the support rod is inserted into the receiving cavity and the front end of the support rod has a mounting seat for suspending the microphone assembly, and there is a gap between the mounting seat and the inner wall of the receiving cavity, a front sound-absorbing sponge is arranged in the front cavity, the front end of the sleeve has a sealing structure, the middle of the sealing structure has a sound inlet hole, and the front sound-absorbing sponge is connected to the external environment through the sound inlet hole.

[0006] Preferably, the sleeve is adjustably arranged at the front end of the shell along the front-to-back direction through a connecting structure, the connecting structure includes an external thread arranged at the front end of the shell and an internal thread arranged in the sleeve and screwed together with the external thread, and the sealing structure includes a sealing plate arranged at the front end of the sleeve and a pushing mechanism connected to the sealing plate.

[0007] Preferably, the pushing mechanism includes a push rod whose front end is connected to the sealing plate and a push plate connected to the rear end of the push rod, and the sound inlet hole passes through the push plate, the push rod and the sealing plate.

[0008] Preferably, the pushing mechanism is a columnar body with a front end connected to the sealing plate, and the sound inlet hole passes through the columnar body and the sealing plate.

[0009] Preferably, the housing comprises a large diameter section and a small diameter section, and the external thread is provided on the small diameter section.

[0010] Preferably, the sleeve is adjustably arranged at the front end of the shell along the front-to-back direction through a connecting structure, the connecting structure includes an internal thread arranged at the front end of the shell and an external thread arranged on the sleeve, and the sealing structure is a sealing plate.

[0011] Preferably, the microphone assembly is a unidirectional electret microphone.

[0012] Preferably, the rear sound-absorbing sponge is pasted in the rear cavity.

[0013] The present invention has the following beneficial effects: the inner cavity of the housing is provided with a rear sound-absorbing sponge and a front sound-absorbing sponge, respectively, to reduce noise transmitted from the housing; the microphone assembly is suspended in the accommodating cavity of the rear sound-absorbing sponge via a support rod and a mounting base, preventing the microphone assembly from directly contacting the housing, thereby preventing external noise from being transmitted into the microphone assembly through the housing. The support rod is a hollow structure, and the output line of the microphone assembly is led from the inside of the support rod to the microphone conduit. The rear end of the rear sound-absorbing sponge is inserted into the microphone conduit, eliminating noise transmitted from the rear conduit of the housing. The customer service voice and noise enter together through the sound inlet, and the sound intensity is reduced after being absorbed by the front sound-absorbing sponge. Because the customer service mouth is very close to the microphone, the customer service voice intensity is much greater than the intensity of surrounding noise. After the noise is largely absorbed by the filled front sound-absorbing sponge, the customer service voice still remains relatively loud. When it is picked up by the microphone pickup assembly and transmitted to the customer, only the customer service voice is detected. This solution has a simple structure, uses a physical structure to reduce noise, is not easily damaged, is low-cost, and has a significant noise reduction effect. This greatly simplifies noise reduction measures in places such as customer service centers, saving a considerable amount of equipment and decoration costs.

[0014] Furthermore, the sleeve can be adjusted in the front-to-back direction through the thread, thereby driving the pushing mechanism in contact with the front sound-absorbing sponge to compress or expand the front sound-absorbing sponge to change the density of the front sound-absorbing sponge, and then adjust the strength of sound absorption. Through adjustment, noise of different intensities in different scenarios can be filtered and absorbed, and the scope of application is greatly increased.

[0015] Furthermore, the pushing mechanism of this structure is more lightweight.

[0016] Furthermore, the pushing mechanism of this structure is simpler and easier to manufacture.

[0017] Furthermore, the shell includes a large diameter section and a small diameter section, and the external thread is provided on the small diameter section. This arrangement allows the outer diameters of the shell and the sleeve to be set to be consistent after the threaded connection, which is more beautiful.

[0018] Furthermore, the connection structure includes an internal thread provided at the front end of the shell and an external thread provided on the sleeve. The sealing structure is a sealing plate. The end of the external thread of the sleeve of this structure is the pushing part for pushing the front sound-absorbing sponge.

[0019] Furthermore, the microphone assembly is a unidirectional electret microphone. The microphone of this structure has the best sensitivity to sounds coming from the front and the highest degree of restoration, and the worst sensitivity and the lowest degree of restoration to sounds coming from the back. It can effectively pick up the sound coming into the sound hole, and can exclude and suppress irrelevant noise from the opposite direction, further enhancing the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the noise reduction microphone in the embodiment. DETAILED DESCRIPTION

[0021] An embodiment of a noise reduction microphone, such as Figure 1 As shown, it includes a cylindrical shell 1 and a sleeve 16 provided at the front end of the shell. A baffle 8 is provided in the middle of the inner cavity of the shell, and a through hole 18 is provided in the middle of the baffle. The baffle divides the inner cavity into a front cavity and a rear cavity. The rear sound-absorbing sponge 6 is in the rear cavity and is bonded and fixed to the inner wall of the rear cavity. The rear end of the rear sound-absorbing sponge 6 is inserted into the microphone wire tube 3 and the front end contacts the baffle 8. A accommodating cavity 19 is provided in the middle of the rear sound-absorbing sponge. The accommodating cavity 19 and the through hole 18 are connected. The front end of the sleeve has a sealing structure with a sound inlet in the middle. Specifically, the sealing structure includes a sealing plate 14 at the front end of the sleeve and a push mechanism connected to the sealing plate. The push mechanism includes a push rod 13 connected to the sealing plate at the front end and a push plate 11 connected to the rear end of the push rod. The sound inlet 12 passes through the push plate 11, push rod 13, and sealing plate 14. The front sound-absorbing sponge is connected to the external environment through the sound inlet. The sleeve is adjustably arranged at the front end of the shell in the front-to-back direction through a connecting structure. The connecting structure includes an external thread 10 provided at the front end of the shell and an internal thread 15 provided in the sleeve and screwed together with the external thread. In order to ensure that the outer diameter of the shell is consistent with the outer diameter of the sleeve and to increase the aesthetics, the shell includes a large diameter section 2 and a small diameter section 17. The external thread 10 is provided on the small diameter section 17, and the large diameter section is integrally connected to the microphone wire tube 3 through a tapered closing.

[0022] It should be noted that the front sound-absorbing sponge adopts medium-density or low-density sponge, and the rear sound-absorbing sponge adopts high-density sponge. The density of the rear sound-absorbing sponge is higher than that of the front sound-absorbing sponge. In addition, the microphone assembly and the unidirectional electret microphone specifically used in this embodiment are existing products and can be purchased on the market, so they will not be elaborated here.

[0023] The noise reduction microphone of this embodiment has a rear sound-absorbing sponge and a front sound-absorbing sponge in the inner cavity of the shell, respectively, to weaken the noise transmitted from the shell; the microphone assembly is suspended in the accommodating cavity of the rear sound-absorbing sponge by a support rod and a mounting base. The microphone assembly is not in direct contact with the shell, thereby preventing external noise from being transmitted into the microphone assembly through the shell; the support rod is a hollow structure, and the output line of the microphone assembly is led out from the inside of the support rod to the microphone wire tube, and the rear end of the rear sound-absorbing sponge is inserted into the microphone wire tube, eliminating the noise transmitted from the rear wire tube of the shell. The customer service voice and noise enter together from the sound inlet hole, and the sound intensity is weakened after being absorbed by the front sound-absorbing sponge. Because the customer service mouth is very close to the microphone, the customer service voice intensity is much greater than the intensity of the surrounding noise. After the noise is basically absorbed by the filled front sound-absorbing sponge, a relatively large customer service voice can still be retained. When it is picked up by the microphone pickup assembly and transmitted to the customer, only the customer service voice is heard. This solution has a simple structure, low cost, and obvious noise reduction effect. The sleeve can be adjusted forward and backward via a threaded mechanism, which in turn drives a push mechanism in contact with the front sound-absorbing sponge to compress or expand it, changing its density and, in turn, adjusting the sound absorption. This adjustment allows for filtering and absorbing noise of varying intensities in different scenarios, greatly expanding its range of applications. The microphone assembly is a unidirectional electret microphone. This structure is most sensitive to sound coming from the front, achieving the highest level of fidelity, while being least sensitive and achieving the lowest level of fidelity from the back. This effectively picks up sound coming from the sound hole while eliminating and suppressing irrelevant noise from the opposite direction, further enhancing the noise reduction effect.

[0024] In other embodiments, different from the above embodiments, the pushing mechanism is a columnar body with a front end connected to the sealing plate, and the sound inlet hole passes through the columnar body and the sealing plate. The pushing mechanism of this structure is simpler and easier to manufacture.

[0025] In other embodiments, unlike the above-described embodiments, a sleeve is adjustable in the front-to-back direction at the front end of the housing via a connecting structure. The connecting structure comprises an internal thread provided at the front end of the housing and an external thread provided on the sleeve, and the sealing structure is a sealing plate. The end of the external thread of the sleeve in this structure serves as a push portion for pushing the front sound-absorbing sponge. In this embodiment, a sleeve with a thicker barrel wall can be selected based on the pushing requirements.

[0026] In other embodiments, different from the above embodiments, the sleeve is slidably mounted on the outer shell, a claw is hingedly arranged on the side wall of the sleeve, the tail of the claw is connected to the side wall of the sleeve through an elastic member, the elastic member can be a compression spring, the head of the claw has a sharp claw, and a fixing hole for inserting the sharp claw is provided at a position corresponding to the claw on the side wall of the sleeve. When in use, press the tail of the claw, and then adjust the front and rear position of the sleeve on the shell, and then release the tail of the claw, so that the sharp claw of the claw is inserted into the fixing hole and pressed against the outer wall of the shell to achieve positioning. The sealing structure of the sleeve of this structure can adopt the sealing structure in the above embodiments.

Claims

1. A noise-canceling microphone, characterized in that: The invention comprises a cylindrical shell and a sleeve arranged at the front end of the shell, a baffle is arranged in the middle of the inner cavity of the shell in a horizontal direction, a through hole is arranged in the middle of the baffle, the baffle divides the inner cavity into a front cavity and a rear cavity, the rear cavity is filled with a rear sound-absorbing sponge, the rear end of the rear sound-absorbing sponge is inserted into the microphone wire tube and the front end contacts the baffle, a receiving cavity is arranged in the middle of the rear sound-absorbing sponge, the receiving cavity is connected to the through hole, a hollow support rod is inserted in the middle of the rear sound-absorbing sponge along the axial direction, the front end of the support rod is inserted into the receiving cavity and the front end of the support rod has a mounting seat for suspending and fixing the microphone assembly, there is a gap between the mounting seat and the inner wall of the receiving cavity, the rear end of the support rod is inserted into the microphone wire tube, the output line of the microphone assembly is led out from the inside of the support rod to the microphone wire tube, and a hole is arranged in the front cavity. The front sound-absorbing sponge, the front end of the sleeve has a sealing structure, the middle of the sealing structure has a sound inlet hole, the front sound-absorbing sponge is connected to the external environment through the sound inlet hole, the sleeve is adjustably arranged at the front end of the shell along the front and rear directions through the connecting structure, the connecting structure includes an external thread provided at the front end of the shell and an internal thread provided in the sleeve and screwed with the external thread, the sealing structure includes a sealing plate provided at the front end of the sleeve and a pushing mechanism connected to the sealing plate; the pushing mechanism includes a push rod connected to the sealing plate at the front end and a push plate connected to the rear end of the push rod, the sound inlet hole passes through the push plate, the push rod and the sealing plate; the sleeve is adjustably arranged at the front end of the shell along the front and rear directions through the connecting structure, the connecting structure includes an internal thread provided at the front end of the shell and an external thread provided on the sleeve, and the sealing structure is a sealing plate.

2. The noise-canceling microphone according to claim 1, wherein: The shell comprises a large diameter section and a small diameter section, and the external thread is provided on the small diameter section.

3. The noise-canceling microphone according to claim 1, wherein: The microphone assembly is a unidirectional electret microphone.

4. The noise-canceling microphone according to claim 1, wherein: The rear sound-absorbing sponge is pasted into the rear cavity.

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