CN110351625A - A kind of physics denoising device, method and application based on gas bleeder valve - Google Patents

Abstract

The invention discloses a physical noise reduction device, method and application based on an air release valve in the technical field of audio noise reduction. By reducing the size of the air pressure flow entering the human ear, the physical noise reduction of noise is carried out. The channel connected with the ears, the channel has a tightening port, and the channel is covered with a vent valve with a vent hole. The outer diameter of the vent valve is larger than the inner diameter of the tightening port. Slide between the air intake holes of the device; the device is applied on the earphones. In the environment of high noise and high air pressure, the present invention first effectively attenuates the noise by setting a vent valve at the front end of the noise, and then reversely cancels the sound by changing the effective volume of the rear cavity, and then cooperates with the earplug (or earmuff) physical Noise reduction, forming an overall noise reduction system, improving the ability of noise reduction devices and earphones to resist high noise and high pressure, and can effectively protect human hearing.

Description

A physical noise reduction device, method and application based on a vent valve

technical field

The present invention relates to the technical field of audio noise reduction, and in particular, relates to a physical noise reduction device, method and application based on a vent valve.

Background technique

With the development of science and technology, people's living standards continue to improve, and more noise will be generated. In order to ensure a good living and working environment, it is necessary to reduce the noise entering the human ear. Therefore, noise-cancelling headphones have emerged as the times require. Noise canceling headphones are the most common.

Physical noise-cancelling headphones are based on the principle of physical isolation. They use simple physical methods to create a closed space by designing the shape of the headphones or the in-ear type close to the ear canal, and to block the extra sound from the outside of the headphones to achieve noise reduction. Effect. For example, in the process of realizing the physical noise reduction effect of in-ear headphones, special-shaped rubber is used to cling to the ear canal to play the role of sound isolation; , and then fill the earmuffs with high-density sound-absorbing cotton or silica gel, and wrap them with protein leather materials to meet people's requirements for wearing comfort. These methods all say that the noise of the outside world is blocked outside the earphone, and then realize the purpose of protecting the hearing of the human ear.

However, the existing physical noise reduction earphones can only achieve a certain noise reduction effect in the noise environment below 105 decibels (civilian market). The current physical noise reduction methods are helpless in environments such as driving and flying personnel taking off and landing. Because when the noise is 10 decibels higher, the energy of the noise increases exponentially, and the noise of 140 decibels can directly impact and bleed and rupture the eardrum of a person without protection, causing permanent deafness.

The above deficiencies are worth addressing.

Contents of the invention

In order to overcome the deficiencies of the existing technologies, the present invention provides a physical noise reduction device, method and application based on a vent valve.

Technical scheme of the present invention is as follows:

A physical noise reduction device based on an air release valve, comprising a device body, the device body is set in the ear canal of the human ear, or is coated on the outside of the human ear, and is characterized in that,

The inside of the device body is provided with an inner cavity and an outer cavity, the inner cavity communicates with the ear canal, the outer cavity is a channel with a tightening mouth, one end communicates with the inner cavity, and the other end passes through The air inlet on the device body communicates with the outside;

A vent valve is set inside the outer cavity, and several vent holes are arranged on the vent valve. The outer diameter of the vent valve is larger than the inner diameter of the tightening port, and the air pressure difference on both sides of the vent valve drives the vent A valve slides between the cinch and the air inlet.

The present invention according to the above solution is characterized in that the tightening opening is located in the middle of the outer cavity.

The present invention according to the above solution is characterized in that a filter is provided at the air inlet.

The present invention according to the above solution is characterized in that the air release valve is a sphere with a smooth surface.

The present invention according to the above solution is characterized in that the air release valve is provided with four air release holes.

On the other hand, a physical noise reduction method based on the air release valve is characterized in that a channel for noise reduction is provided on the body of the physical noise reduction device worn by the human ear, and by reducing the size of the air pressure flow entering the human ear, To perform physical noise reduction of noise.

According to the present invention of the above-mentioned scheme, it is characterized in that a deaeration valve for noise reduction is provided in the passage, a deaeration hole is provided on the deaeration valve, and when the device body is located in a noisy environment, the deaeration valve is close to the On the inner wall of the channel, the boosted airflow from the outside enters the human ear after being depressurized through the vent hole.

According to the above solution, the present invention is characterized in that while reducing the size of the airflow entering the human ear, the effective volume of the cavity connected to the human ear is reduced, so that the output sound pressure of the device body is reduced.

Further, an air release valve for noise reduction is provided in the channel, and by controlling the position of the air release valve in the channel, the effective volume of the cavity communicating with the human ear is reduced.

An earphone using a physical noise reduction device based on an air release valve, characterized in that the above-mentioned physical noise reduction device based on an air release valve is set in the earphone.

According to the above solution of the present invention, it is characterized in that the earphone using the physical noise reduction device based on the air release valve is an in-ear earphone or a headset.

According to the present invention of the above-mentioned scheme, its beneficial effect is that, in the environment of high noise and high air pressure, the present invention performs air release and pressure relief through the air release valve device at the front end of the noise, so as to release part of the noise energy in advance, and the movement of the air release valve changes The effective cavity volume of the earphone can then change the curve of the sound and sound, reduce the frequency response and sound pressure curve of the noise in the earphone cavity, improve the ability to resist high noise and high air pressure, and can effectively protect the hearing of the human ear. The whole structure and device are simple and no need The complex peripheral structure can achieve a good noise reduction effect, reducing the corresponding cost and weight of the finished product of the noise reduction earphone.

Description of drawings

Fig. 1 is a schematic structural diagram of a specific embodiment of the present invention.

In the figure, 1. inner chamber; 21. first outer chamber; 22. second outer chamber; 3. air inlet; 4. air release valve; 5. air release hole; 6. tightening mouth.

Detailed ways

The present invention is further described below in conjunction with accompanying drawing and embodiment:

As shown in Figure 1, a physical noise reduction device based on a vent valve includes a device body, which is placed in the ear canal of the human ear, or wrapped around the outside of the human ear, to achieve noise reduction for the sound entering the human ear.

The device body is provided with an inner cavity 1 and an outer cavity. The inner cavity 1 communicates with the ear canal, and the outer cavity is a channel with a tightening port 6. One end communicates with the inner cavity 1, and the other end passes through the air intake on the device body. Hole 3 communicates with the outside. In this embodiment, the tightening port 6 is located in the middle of the outer cavity, and the specific location of the tightening port 6 can be adjusted according to different usage environments. The volume of the external cavity inside the tightening port 6 (ie, the first external cavity 21 ) is smaller than the volume outside the tightening port 6 (ie, the second external cavity 22 ), and the volume of the first external cavity 21 is preferably the same as that of the second external cavity 22 The volume ratio is 1:1.25, which makes the channel air pressure change value of the outer cavity more suitable for the air pressure level caused by the noise borne by the human body.

The outer cavity is covered with a vent valve 4, and the vent valve 4 is provided with a number of vent holes 5. The outer diameter of the vent valve 4 is larger than the inner diameter of the tightening port 6, and the pressure difference on both sides of the vent valve 4 drives the vent valve 4 in the tightening port. 6 slides between air intake hole 3. After the number of vent holes 5 is modeled according to the cavity acoustics, the simulation calculation shows that the number of vent holes 5 increases with the increase of the air pressure difference inside and outside the tightening port 6 . In this embodiment, the air release valve 4 is provided with four air release holes 5, so that the sound response system of the entire noise reduction device coincides with the pressure difference balance time, so that the noise reduction treatment effect is better.

Preferably, the air release valve 4 is a sphere with a smooth surface, which is beneficial for the air release valve 4 to slide in the outer cavity, so that when noise occurs, the air release valve can respond in time.

Preferably, a filter screen is provided at the air inlet 5, which can filter out impurities in the use environment. Preferably, the filter is detachably connected to the device body, which facilitates replacement of the filter and ensures the service life of the entire earphone.

A physical noise reduction method based on the air release valve. A channel for noise reduction is provided on the body of the physical noise reduction device worn by the human ear, and the physical noise reduction of the noise is performed by reducing the air pressure flow entering the human ear. Specifically: a vent valve for noise reduction is installed in the passage, and a vent hole is arranged on the vent valve. When the device body is in a noisy environment, the vent valve is close to the inner wall of the passage, and the boosted airflow from the outside enters the human ear through the vent hole.

In the present invention, the realization principle of physical noise reduction of noise by reducing the air pressure flow entering the human ear is as follows:

As we all know, high-noise environments are often accompanied by strong air pressure. Under the action of gravity in the original state, the air release valve is located at the position of the air intake hole. When strong external pressure (such as an airplane landing) acts, a strong air pressure difference is formed in the space inside and outside the air release valve. The strong air flow enters the intake hole and pushes the air release valve to move inward to the narrowest part of the passage (that is, the tightening mouth). At this time, the air release valve divides the outer cavity into the first outer cavity and the second outer cavity (the second outer cavity is connected External), only a small part of the strong air flow can enter the first outer cavity and inner cavity through the vent hole, and then the effect on the strong air flow can be effectively buffered and weakened, so as to weaken the strong air flow to the human eardrum. pressure effect. When the pressure difference between the first outer cavity and the second outer cavity decreases, the air release valve will fall back to the position of the air intake hole.

Preferably, while reducing the size of the airflow entering the human ear, the effective volume of the cavity connected to the human ear is reduced, so that the sound pressure output by the device body is reduced, and further noise reduction processing is performed on the noise. Specifically: a vent valve for noise reduction is provided in the channel, and the effective volume of the cavity connected to the human ear is reduced by controlling the position of the vent valve in the channel.

In the present invention, by reducing the effective volume of the cavity connected to the human ear, the realization principle of physical noise reduction of noise is as follows:

When the air release valve is placed at the tightening port position, the effective volume of the device body communicating with the human ear becomes smaller (that is, the sum of the first outer cavity and the inner cavity), and at this time, the rear cavity of the device body (that is, the first outer cavity and the inner cavity) and) become smaller and change the frequency response curve of the device body. When strong noise and strong air pressure act on the rear cavity, the smaller volume (that is, the volume of the first external cavity) shows stronger pressure resistance, and a part of the noise energy It can be effectively reflected back; at the same time, in a high-noise environment, when the back cavity of the device body becomes smaller, the low-frequency part of the frequency response curve of the sound rises and the high-frequency part sinks, and the sound pressure level and output volume output by the device body decrease, which is even worse. It is beneficial to meet the setting of the noise reduction curve, the noise reduction effect is deeper and more obvious, the sound heard by the human ear will be reduced, and it is more conducive to protecting people's hearing.

The number of holes in the relief valve directly determines the time required for the pressure difference inside and outside the relief valve to balance, that is, the system response time. When strong noise and strong air pressure enter the air inlet and act on the outer cavity, due to the strong pressure difference between the inner cavity and the outer cavity, according to the pressure and pressure calculation formula F=p×s (F is pressure, p is pressure, s is force area), when the pressure is constant, the area of the stressed cavity will decrease rapidly to weaken the effect of the pressure difference, and the pressure difference will prompt the vent valve to move quickly to the tightening port. At this time, the number of openings will directly affect the vent valve. Moving speed.

In this embodiment, when the number of vent holes on the vent valve is 4, the system response time coincides with the pressure difference balance time to ensure the best system response time, thereby protecting the human ear from the strong noise environment in time.

The above-mentioned device body can be set in the earphone, and the sound noise reduction can be realized by wearing the earphone. The earphone may be an in-ear earphone or a headset, or may be a device worn by other people's ears, or the like.

In the present invention, when the earphone with the device body is located in a strong noise and strong air pressure environment, the air release valve first effectively attenuates the noise, and then reversely cancels the sound by changing the effective volume of the rear cavity, and then cooperates with earplugs (or earmuffs) Physical noise reduction, forming an overall noise reduction system, can reduce noise by 20 decibels, greatly improving the hearing of personnel working in high-noise environments. personnel, etc.) to provide absolutely safe and effective hearing protection, directly prolonging the time of eardrum aging.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

The patent of the present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the implementation of the patent of the present invention is not limited by the above-mentioned method, as long as the method concept and technical solutions of the patent of the present invention are adopted. Various improvements are made, or there is no improvement Directly applying the concepts and technical solutions of the patent of the present invention to other occasions is within the protection scope of the present invention.

Claims (10)

1. A physical noise reduction device based on the air release valve, comprising a device body, the device body is enclosed in the ear canal of the human ear, or is coated on the outside of the human ear, characterized in that, The inside of the device body is provided with an inner cavity and an outer cavity, the inner cavity communicates with the ear canal, the outer cavity is a channel with a tightening mouth, one end communicates with the inner cavity, and the other end passes through The air inlet on the device body communicates with the outside; A vent valve is set inside the outer cavity, and several vent holes are arranged on the vent valve. The outer diameter of the vent valve is larger than the inner diameter of the tightening port, and the air pressure difference on both sides of the vent valve drives the vent A valve slides between the cinch and the air inlet. 2 . The physical noise reduction device based on the air release valve according to claim 1 , wherein the tightening port is located in the middle of the outer cavity. 3 . 3 . The physical noise reduction device based on the air release valve according to claim 1 , wherein a filter is provided at the air inlet. 4 . 4. The physical noise reduction device based on the air release valve according to claim 1, characterized in that, the air release valve is provided with four air release holes. 5. A physical noise reduction method based on the air release valve, characterized in that a channel for noise reduction is set on the body of the physical noise reduction device worn by the human ear, and the air pressure flow entering the human ear is reduced to perform Physical noise reduction for noise. 6. The physical noise reduction method based on the air release valve according to claim 5, characterized in that, an air release valve for noise reduction is set in the passage, an air release hole is arranged on the air release valve, and the device body is located at the noise level. In ambient conditions, the air release valve is in close contact with the inner wall of the channel, and the boosted air flow from outside enters the human ear after being depressurized through the air release hole. 7. The physical noise reduction method based on the air release valve according to claim 5, characterized in that while reducing the size of the airflow entering the human ear, the effective volume of the cavity connected to the human ear is reduced, so that the output of the device body sound pressure drop. 8. The physical noise reduction method based on the air release valve according to claim 7, characterized in that, an air release valve for noise reduction is set in the passage, and by controlling the position of the air release valve in the passage, reducing The effective volume of the cavity communicating with the human ear. 9. An earphone using a physical noise reduction device based on an air release valve, characterized in that the physical noise reduction device based on an air release valve according to any one of claims 1 to 4 is set in the earphone. 10. The earphone applying the physical noise reduction device based on the air release valve according to claim 9, wherein the earphone using the physical noise reduction device based on the air release valve is an in-ear earphone or a headphone.