CN215818538U - Earphone with feedback enhancement design - Google Patents
Earphone with feedback enhancement design Download PDFInfo
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- CN215818538U CN215818538U CN202121743662.XU CN202121743662U CN215818538U CN 215818538 U CN215818538 U CN 215818538U CN 202121743662 U CN202121743662 U CN 202121743662U CN 215818538 U CN215818538 U CN 215818538U
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Abstract
The utility model discloses an earphone with a feedback enhancement design, which comprises an earshell assembly and an active noise reduction ANC system, wherein the earshell assembly comprises an earshell, a loudspeaker and a loudspeaker cover; at least two feedback microphones are arranged in the earshell assembly, and the at least two feedback microphones are connected with the ANC system after being connected in parallel. The earphone with the feedback enhancement design can further improve the performance of the earphone and is beneficial to reducing the cost.
Description
Technical Field
The utility model relates to the technical field of earphones, in particular to an earphone with a feedback enhancement design.
Background
Some headsets now begin to employ active noise reduction designs to reduce noise in the external environment. The Active Noise reduction earphone is provided with an ANC (Active Noise reduction) system and a microphone, wherein the microphone acquires Noise in the environment, and the ANC system enables an earphone loudspeaker to generate sound waves opposite to the ambient Noise after operation so as to offset the Noise in the environment. The active noise reduction earphone has an obvious effect of reducing the noise of the middle and low frequency bands. Active noise reduction headphones can be classified into the following categories:
firstly, feedforward type active noise reduction: exposing the microphone to noise and isolated from the horn;
secondly, feedback type active noise reduction: placing a microphone proximate to the horn;
thirdly, feedforward and feedback combined type: there are two microphones simultaneously, one isolated from the horn and the other close to the horn.
SUMMERY OF THE UTILITY MODEL
The utility model mainly solves the technical problem of providing an earphone with a feedback enhancement design so as to further improve the performance of the earphone.
The earphone with the feedback enhancement design comprises an earshell assembly and an active noise reduction ANC system, wherein the earshell assembly comprises an earshell, a loudspeaker and a loudspeaker cover; the ear shell component is characterized in that at least two feedback microphones are arranged in the ear shell component, and the at least two feedback microphones are connected with the ANC system after being connected in parallel.
In a possible implementation manner, the feedback microphone is vertically placed relative to the loudspeaker, and the sound pickup surface of the feedback microphone is perpendicular or nearly perpendicular to the sound production surface of the loudspeaker.
In a possible implementation manner, the back surface of the speaker cover covers the ear shell, the speaker is installed on the back surface of the speaker cover and contained in the cavity of the ear shell, and the feedback microphone is installed on the front surface of the speaker cover.
In a possible implementation manner, the speaker cover includes a peripheral connection area and an intermediate fixing plate provided with a sound transmission hole, the peripheral connection area is connected with the ear shell, and the speaker and the feedback microphone are respectively installed on two sides of the intermediate fixing plate; the intermediate fixing plate is recessed into the ear shell relative to the peripheral connecting region, and a space for accommodating the feedback microphone is formed in the recessed position.
In a possible implementation manner, the speaker is installed in the center of the back surface of the middle fixing plate, and at least two feedback microphones are arranged around the speaker at the edge of the front surface of the middle fixing plate.
In one possible implementation, the intermediate fixing plate is inclined at an angle with respect to the peripheral connecting region such that the sound emitting surface of the speaker is perpendicular to the ear canal of the human ear when the earphone is worn on the human ear.
In a possible implementation, the earshell assembly further comprises an ear pad connected to the front surface of the speaker cover, when the earphone is worn on the ear of a person, the ear pad is attached to the ear of the person, the ear pad and the speaker cover jointly enclose a front cavity, and the feedback microphone is located in the front cavity.
According to the technical scheme, the embodiment of the utility model has the following advantages:
1. the earphone of the application adopts the feedback enhancement design scheme that at least two feedback microphones are connected in parallel, and compared with the existing single feedback microphone scheme, the earphone can effectively enhance the openloop transfer function of the feedback microphone, thereby increasing the intensity of the feedback ANC and having better induction on the ANC listening feeling.
2. The prior art single feedback microphone approach requires excessive emphasis on the low frequency part of the headphone energy, or increases the SPL (sensitivity) of the speaker, which can cause some undesirable problems: firstly, harmonic distortion is very difficult to control, and secondly, the earphone is very inaudible after the low frequency is excessively increased, especially under the conditions of no electricity and incapability of starting up. The feedback enhancement design scheme of this application need not deliberately promote the gain of low frequency part, and this has very good help to the definition of earphone, makes the earphone realize the requirement of HiFi tone quality more easily, improves the degree of restitution of sound.
3. The feedback enhancement design scheme can reduce the adjustment gain of an ANC system (generally realized by using a DSP), and allows a low-cost chip to realize better ANC performance, thereby reducing the cost of the earphone.
Drawings
Reference will now be made briefly to the embodiments and drawings that are needed for use in the description of the prior art.
FIG. 1 is an exploded view of an earshell assembly of a headset in accordance with one embodiment of the present invention;
fig. 2 is a schematic view of a back side of an earshell assembly in accordance with an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, and in the above-described drawings, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The following will explain details by way of specific examples.
Referring to fig. 1 and 2, one embodiment of the present invention provides a feedback enhanced design of a headset. The headset includes a pair of earshell assemblies and an ear band connecting the pair of earshell assemblies. The earshell assembly comprises an earshell 1, a horn 2 and a horn cover 3. The earmuff 1 is internally provided with a cavity, the horn is positioned in the cavity and is fixedly arranged on the horn cover 3, and the horn cover 3 is connected on the earmuff 1 in a covering manner and seals the cavity.
As a noise reducing headphone, the headphone further comprises an active noise reducing ANC system (not shown in the figure) and a feedback microphone 4 arranged between the loudspeaker 2 and the ear of the wearer. The feedback microphone 4 is used for acquiring the ambient noise of the ear, and the ANC system calculates the ambient noise and outputs a signal to the loudspeaker 2, so that the loudspeaker 2 generates sound waves opposite to the ambient noise to counteract the noise in the environment. The ANC system may typically be implemented using a DSP (digital signal processor) within which the filters are formed.
In order to improve the noise reduction performance and improve the sound quality of the earphone, in this embodiment, at least two feedback microphones 4 are disposed in the earmuff component, and at least two feedback microphones 4 are connected in parallel and then connected to the ANC system, so that the signals picked up by at least two feedback microphones 4 are output to the ANC system after being enhanced in parallel. The multi-feedback microphone design adopting at least two feedback microphones is a feedback enhancement design scheme, and compared with a single-feedback microphone scheme, the multi-feedback microphone design can effectively enhance the open loop transfer function of the feedback microphones, increase the intensity of feedback ANC and have better induction on ANC listening feeling.
In order to further improve the performance, the feedback microphone can be vertically placed relative to the loudspeaker, so that the sound pickup surface of the feedback microphone is perpendicular or nearly perpendicular to the sound production surface of the loudspeaker. For parallel placement mode, the pick-up face of feedback microphone is parallel with the sound production face of loudspeaker or is located the coplanar's placement mode promptly, adopts vertical the placing, distinguishes the difference of the sound that sends of loudspeaker and ambient noise more easily, avoids the sound that is close with ambient noise that loudspeaker sent to be handled to avoid causing the distortion.
As shown in the figure, the back of the speaker cover 3 covers the ear shell 1, the speaker 2 is installed on the back of the speaker cover 3 and accommodated in the cavity of the ear shell 1, and the feedback microphone 4 is installed on the front of the speaker cover 3, so that the feedback microphone 4 is located in the front cavity between the speaker 2 and the ear.
Optionally, the speaker cover 3 includes a peripheral connection area 31 and an intermediate fixing plate 33 provided with a sound-transmitting hole 32, the peripheral connection area 31 is connected to the ear shell 1, and the speaker 2 and the feedback microphone 4 are respectively mounted on two sides of the intermediate fixing plate 33; the intermediate fixing plate 33 is recessed into the ear shell 1 with respect to the peripheral connecting region 31, and a space for accommodating the feedback microphone 4 is formed in the recessed position. By accommodating the feedback microphone 4 in the formed concave space, the discomfort of wearing caused by the fact that the feedback microphone is pressed against the ear of a wearer when the feedback microphone is worn is avoided.
Optionally, the speaker 2 is installed in the center of the back surface of the middle fixing plate 33, and at least two feedback microphones 4 are disposed around the speaker 2 at the edge of the front surface of the middle fixing plate 33. Further, at least two feedback microphones 4 may be circumferentially and uniformly arranged around the horn 2.
Alternatively, for the reason of the shape of the human ear, the middle fixing plate 33 may be disposed obliquely at an angle relative to the peripheral connecting area 31, so that when the earphone is worn on the human ear, the sound emitting surface of the speaker 2 is perpendicular to the ear canal of the human ear. The inclination angle can be designed to be between 5 and 15 degrees according to the shape of the human ear part.
Further, the earmuff component is still including connect in the ear pad 5 of the front of loudspeaker cover 3, when the earphone was worn in the people's ear, the laminating of ear pad 5 was at people's ear position, with loudspeaker cover 3 encloses synthetic front cavity jointly, feedback microphone 4 then is located in the front cavity. The ear pad 5 is made of soft material and surrounds the human ear, and is also called an earmuff.
In summary, the embodiment of the utility model discloses an earphone with a feedback enhancement design. By adopting the technical scheme, the earphone has the following advantages:
1. the earphone of the application adopts the feedback enhancement design scheme of at least two feedback microphones and parallel connection, and compared with the existing single feedback microphone scheme, the earphone can effectively enhance the Open Loop (OL) Transfer Function (TF) of the feedback microphone, thereby increasing the intensity of the feedback ANC and having better induction on the ANC listening feeling.
The design principle of a Feedback (FB) Filter (Filter) in an ANC system is as follows:
FB Filter＝OL(TF)*(-1)
OL (TF) > > measured open loop response;
FB > > ideal NC filter gain.
2. The prior art single feedback microphone approach requires excessive emphasis on the low frequency part of the headphone energy, or increases the SPL (sensitivity) of the speaker, which can cause some undesirable problems: firstly, harmonic distortion is very difficult to control, and secondly, the earphone is very inaudible after the low frequency is excessively increased, especially under the conditions of no electricity and incapability of starting up. The feedback enhancement design scheme of this application need not deliberately promote the gain of low frequency part, and this has very good help to the definition of earphone, makes the earphone realize the requirement of HiFi tone quality more easily, improves the degree of restitution of sound.
3. The feedback enhancement design scheme can reduce the adjustment gain of an ANC system (generally realized by using a DSP), and allows a low-cost chip to realize better ANC performance, thereby reducing the cost of the earphone.
The technical solution of the present invention is explained in detail by the specific embodiments above. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same. The technical solutions described in the above embodiments can be modified or part of the technical features can be equivalently replaced by those skilled in the art; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. An earphone of a feedback enhanced design, comprising a concha assembly and an active noise reduction (ANC) system, wherein the concha assembly comprises a concha, a horn and a horn cover; the ear shell component is characterized in that at least two feedback microphones are arranged in the ear shell component, and the at least two feedback microphones are connected with the ANC system after being connected in parallel.
2. The feedback-enhanced design of headphones of claim 1,
the feedback microphone is vertical to the loudspeaker, the pickup surface of the feedback microphone is perpendicular to or close to perpendicular to the sound production surface of the loudspeaker.
3. The feedback-enhanced design of earphone according to claim 1, wherein the back of the speaker cover covers the ear shell, the speaker is mounted on the back of the speaker cover and is received in the cavity of the ear shell, and the feedback microphone is mounted on the front of the speaker cover.
4. The feedback-enhanced design of earphone according to claim 3,
the loudspeaker cover comprises a peripheral connecting area and a middle fixing plate provided with sound transmission holes, the peripheral connecting area is connected with the earshell, and the loudspeaker and the feedback microphone are respectively arranged on two surfaces of the middle fixing plate; the intermediate fixing plate is recessed into the ear shell relative to the peripheral connecting region, and a space for accommodating the feedback microphone is formed in the recessed position.
5. The feedback-enhanced design earphone of claim 4, wherein the speaker is mounted in the center of the back of the middle fixing plate, and at least two of the feedback microphones are disposed around the speaker at the edge of the front of the middle fixing plate.
6. The feedback-enhanced design of earphone according to claim 4,
the middle fixing plate is inclined relative to the peripheral connecting area, so that when the earphone is worn on the ear of a person, the sound production surface of the loudspeaker is perpendicular to the auditory canal of the ear of the person.
7. A feedback-enhanced designed earphone according to any one of claims 1-6,
the earlap subassembly still including connect in the positive ear pad of horn cover, when the earphone was worn in the people's ear, the ear pad laminating at people's ear position, with the horn cover encloses synthetic front cavity jointly, the feedback microphone is located the front cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121743662.XU CN215818538U (en) | 2021-07-29 | 2021-07-29 | Earphone with feedback enhancement design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121743662.XU CN215818538U (en) | 2021-07-29 | 2021-07-29 | Earphone with feedback enhancement design |
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| CN215818538U true CN215818538U (en) | 2022-02-11 |
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| CN202121743662.XU Active CN215818538U (en) | 2021-07-29 | 2021-07-29 | Earphone with feedback enhancement design |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024099268A1 (en) * | 2022-11-11 | 2024-05-16 | 歌尔科技有限公司 | Noise reduction method and apparatus, earphone device, and computer-readable storage medium |
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2021
- 2021-07-29 CN CN202121743662.XU patent/CN215818538U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024099268A1 (en) * | 2022-11-11 | 2024-05-16 | 歌尔科技有限公司 | Noise reduction method and apparatus, earphone device, and computer-readable storage medium |
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