CN217546225U - Loudspeaker and active noise reduction earphone - Google Patents

Abstract

The application provides a speaker and an active noise reduction earphone. The utility model provides a loudspeaker is provided with the microphone along loudspeaker monomer sound field propagation direction before its vibrating diaphragm to set up between this microphone and the loudspeaker monomer through linking arm fixed connection. The loudspeaker of the application can directly utilize the microphone to measure and correct the frequency response characteristic of the acoustic path. In addition, the speaker of this application can also assemble in most initiative noise reduction earphone simply, it is little to have to occupy earphone inner chamber space, the assembly degree of difficulty is low, and the accessible sets up the length and the angle of linking arm in order to guarantee that the assembly relation is identical completely between loudspeaker monomer and the microphone in the initiative noise reduction earphone in batches, thereby improve the hardware uniformity, thereby make each earphone homoenergetic uniformity revise earphone two secondary path frequency response according to the standard, thereby further improve the earphone and use experience.

Description

Loudspeaker and active noise reduction earphone

Technical Field

The application relates to the field of electroacoustic equipment, in particular to a loudspeaker and an active noise reduction earphone.

Background

The loudspeakers are common sound generating devices, have substantially the same structure, and are only used for converting electric signals into sound signals to be played.

Under application scenes of acoustic testing, product model selection and the like, the frequency response characteristic of a corresponding acoustic path can be restored by calculating only by adding a sound signal acquisition device in the acoustic path of the loudspeaker. For example, when the existing speaker is used for an active noise reduction earphone, a feedback microphone is generally required to be further installed in the earphone. The assembly tolerance between the loudspeaker and the independently arranged feedback microphone can cause the deviation between the actual acoustic path and the calibrated acoustic path, thereby influencing the consistency of the noise reduction effect of the earphone products in batch production. Thus, the application of the existing speaker has obvious limitation.

SUMMERY OF THE UTILITY MODEL

This application provides a speaker and initiative noise reduction earphone to prior art's not enough, and this application passes through the linking arm with loudspeaker monomer and microphone to be connected as a whole, can directly realize the survey of acoustics route frequency response characteristic through the speaker. The technical scheme is specifically adopted in the application.

First, in order to achieve the above object, there is provided a speaker including: the loudspeaker single body is vibrated to produce sound through a vibrating diaphragm; the microphone is arranged on the front side of the vibrating diaphragm along the propagation direction of the sound field of the loudspeaker monomer; and the connecting arm is connected between the loudspeaker monomer and the microphone and fixes the microphone.

Optionally, the speaker as described in any of the above, wherein the connecting arm includes: one end of the fixed arm is fixedly connected with the horn monomer; and the telescopic arm is connected between the fixed arm and the microphone in a telescopic manner along the other end of the fixed arm.

Optionally, the speaker as described in any of the above, wherein a steering lock shaft is further connected between the connecting arm and the microphone, and the steering lock shaft has rotational degrees of freedom in three directions, and is used to adjust a relative angle between the single speaker diaphragm surface and the microphone sound collecting surface.

Optionally, in the speaker according to any of the above descriptions, the steering lock shaft and the telescopic arm are respectively provided with a locking portion, and in a locked state, a telescopic length of the connecting arm and a connecting angle of the steering lock shaft are respectively kept fixed.

Optionally, the speaker as described in any of the above, wherein the three rotational degrees of freedom include: the diaphragm is rotated forward or backward with respect to the diaphragm face, rotated leftward or rightward with respect to the diaphragm face, and rotated upward or downward with respect to the diaphragm face.

Meanwhile, in order to achieve the above purpose, the present application further provides an active noise reduction earphone, which includes the speaker as described in any one of the above.

Optionally, the active noise reduction earphones as described in any one of the above, wherein the telescopic length of the connecting arm and the locking angle of the steering lock shaft in each active noise reduction earphone are all kept consistent.

Optionally, the active noise reduction earphone as described in any of the above, wherein the microphone is disposed in an inner cavity of the earphone at a position close to the sound outlet, and is fixedly disposed between the diaphragm surface of the speaker unit and the sound outlet.

Optionally, the active noise reduction earphone as described in any of the above, wherein the active noise reduction earphone is provided with a secondary path frequency response correction unit, which is connected to the microphone, receives the feedback signal collected by the microphone, and outputs a secondary path frequency response characteristic correction signal for adjusting the noise reduction parameter of the earphone.

Optionally, the active noise reduction earphone as described in any one of the above, wherein the sound receiving surface of the microphone is disposed approximately parallel to the sound emitting direction of the speaker unit.

Advantageous effects

The utility model provides a speaker is provided with the microphone along its free sound field propagation direction of loudspeaker further before its vibrating diaphragm to set up between this microphone and the loudspeaker monomer through linking arm fixed connection. The loudspeaker of the application can directly utilize the microphone to measure and correct the frequency response characteristic of the acoustic path. In addition, the loudspeaker of this application can also assemble in most of initiatively falling the noise earphones simply, and it is little, the assembly degree of difficulty is low to occupy earphone inner chamber space to the accessible sets up the length and the angle of linking arm in order to guarantee that the assembly relation is completely unanimous between loudspeaker monomer and the microphone in the initiatively falling the noise earphone in batches, thereby improves the noise reduction effect uniformity, further improves the earphone and uses experience.

Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the present application.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:

fig. 1 is a schematic view of the overall structure of a speaker of the present application;

fig. 2 is a schematic view of a loudspeaker of the present application in a second state of use;

fig. 3 is a diagram of the loudspeaker of the present application in a third state of use;

fig. 4 is a diagram of a loudspeaker of the present application in a fourth use state;

fig. 5 is a schematic diagram of an internal structure in the active noise reduction headphone of the present application;

fig. 6 is a schematic diagram of a speaker unit and a microphone structure in the speaker of the present application;

in the figure, 1 represents a horn unit; 2 denotes a microphone; 3 denotes a linking arm; 31 denotes a fixing arm; 32 denotes a telescopic arm; and 33, a steering lock shaft.

Detailed Description

In order to make the purpose and technical solutions of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without inventive effort, are within the scope of protection of the application.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "inside and outside" in this application means that the direction from its housing to the internal acoustic cavity is inside and vice versa, relative to the active noise reduction earphone itself; and not as a specific limitation on the mechanism of the device of the present application.

The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.

The meaning of "front and back" in this application means that, relative to the diaphragm surface of the speaker unit, the direction from the center point of the microphone to the center point of the microphone is front, otherwise, the direction is back; the meaning of 'left and right' refers to that relative to the vibrating diaphragm surface of the loudspeaker monomer, the direction in which the center point of the microphone is fixed and the outer normal line of the sound receiving surface and the vibrating diaphragm surface form an acute angle is the left, and vice versa; the meaning of "up and down" means that the microphone sound-receiving surface is up in the direction of raising the center point of the microphone in the current plane relative to the diaphragm surface of the speaker unit, whereas the opposite is down, and is not a specific limitation to the mechanism of the device of the present application.

Fig. 1 is a loudspeaker according to the present application, comprising:

one or more loudspeaker single bodies 1, each loudspeaker single body is vibrated by a vibrating diaphragm to produce sound;

one or more microphones 2, each microphone can be arranged on the front side of the loudspeaker single body vibrating diaphragm along the sound field propagation direction of the corresponding loudspeaker single body, and can also be arranged in front of each loudspeaker single body vibrating diaphragm along the sound field propagation direction of the sound source array formed by the loudspeaker single bodies 1;

wherein, the horn unit 1 is connected with the microphone 2 through the connecting arm 3, and provides a fixation to keep the setting distance and the relative angle between the microphone 2 and the horn unit constant.

Therefore, in the acoustic test, the loudspeaker provided by the application can independently complete the determination of the frequency response characteristic of the acoustic path without additionally arranging a microphone in any test scene.

In the measuring process, the length size and the connecting angle of the connecting arm can be correspondingly set according to the starting/stopping point, the distance, the track and the like of the path to be measured; then inputting a horn monomer electric signal x to obtain a signal y acquired by a microphone; frequency spectrum X (f) of analysis signal X and conjugate frequency spectrum X thereof ^* (f) The conjugate spectrum Y of the signal Y ^* (f) Obtaining the acoustic frequency response of the path to be measured

For the convenience adjust angle, distance between loudspeaker monomer and the microphone according to the start/stop point in the route that awaits measuring, distance, orbit etc. this application can further set up linking arm 3 between loudspeaker monomer and the microphone through fig. 2, fig. 3 or fig. 4 mode to include:

a fixed arm 31, one end of which is fixedly connected with the horn single body 1 and the other end extends along the sound field propagation direction of the horn single body;

and a telescopic arm 32 telescopically coupled to the fixing arm 31 along the other end of the fixing arm 31, and coupling the fixing arm and the microphone 2 to adjust an acoustic path interval distance between the microphone 2 and the speaker unit.

In order to further provide measurement of sound field distribution at different angle positions on a sound field propagation path, one or a plurality of steering locking shafts 33 can be further connected between the connecting arm 3 and the microphone 2, and the steering locking shafts are set to have rotational freedom degrees in three different dimensional directions, so that the relative angle between the diaphragm surface of the speaker unit 1 and the sound receiving surface of the microphone 2 can be flexibly adjusted. Therefore, the front and back distances of the microphone arranged at the front end of the speaker unit of the loudspeaker can be flexibly adjusted according to test requirements or limitations of device assembling space, and the microphone can flexibly rotate forwards or backwards relative to the vibrating diaphragm surface in a mode of fig. 2, or rotate upwards or downwards relative to the vibrating diaphragm surface in a mode of fig. 3, or rotate leftwards or rightwards relative to the vibrating diaphragm surface in a mode of fig. 4. Therefore, after the telescopic distance and the rotating angle of the connecting arm are locked and clamped, the loudspeaker can measure the path acoustic frequency response S (f) according to the starting point, the stopping point, the distance and the track of the acoustic path corresponding to the specific angle/distance position. Thereby enabling the acoustic device in which the loudspeaker is installed to perform sound field optimization in accordance with the acoustic frequency response characteristics of the path.

In order to ensure that the distance and the track of the corresponding acoustic path between the speaker unit and the microphone have high consistency in the testing process of a plurality of speakers, one or a plurality of locking parts can be further arranged on the steering locking shaft 33 and the telescopic arm 32 respectively. In the locked state, the telescopic length of the connecting arm 3 and the connecting angle with the steering lock shaft 33 can be kept fixed according to the same length scale and the same angle scale, respectively. From this, with the linking arm locking of different speakers under same angle, same distance state, can guarantee to have highly uniform between distance, the orbit in the acoustics route between loudspeaker monomer and the microphone when measuring to guarantee test effect.

The speaker provided above with the microphone integrally connected thereto can also be mounted in an earphone in the manner shown in fig. 5, using the microphone therein as a feedback microphone of the earphone. The active noise reduction earphone can correspondingly adjust the noise reduction parameters of the earphone according to the frequency response characteristic of the secondary path of the earphone measured by the loudspeaker so as to provide better noise reduction effect.

When specifically setting up, this application can be close to the position in the sound hole with microphone 2 setting in the earphone inner chamber, lies in between loudspeaker monomer 1's vibrating diaphragm face and the sound hole with its fixed setting, is close to earphone sound hole one side.

For the same earphone, the assembly space in the shell is kept consistent, and the telescopic length of the connecting arm 3 and the locking angle of the steering locking shaft 33 in each active noise reduction earphone can also be accurately set and kept consistent through the scales. Therefore, after the connection distance and the angle relation between the loudspeaker single body and the microphone are fixed, a set of secondary path frequency response parameters and noise reduction parameters matched with the sound field path can be calibrated on a production line uniformly, relative consistency during structure assembly is realized through the design of the loudspeaker, and the same noise reduction effect and the same acoustic rendering effect are realized among all earphones according to the same standard. Under other implementation manners, the speaker unit 1 and the microphone 2 shown in fig. 6 can also be fixedly installed in the direction of the sound production path of the earphone, so as to achieve a similar noise reduction effect.

In practice, the present application may further embed an independent operation unit or add a corresponding control program in the control module of the active noise reduction earphone equipped with the above speaker to modify the earphone control parameters according to the secondary path frequency response. The secondary path frequency response correction unit is connected with and receives the feedback signal y collected by the microphone 2, and can acquire the signal spectrum X (f) input into the loudspeaker unit 1 through a system internal signal path or directly calling the loudspeaker unit driving data. Therefore, the secondary path frequency response correction unit can correct the secondary path frequency response characteristic of the earphone and correspondingly adjust the noise reduction parameter of the earphone according to the received feedback signal collected by the microphone 2 in the following ways: firstly, the conjugate frequency spectrum X corresponding to the speaker monomer 1 is calculated ^* (f) And the conjugate spectrum Y of the feedback signal Y ^* (f) (ii) a The secondary path frequency response of the earphone is then corrected to

And correspondingly adjusting the earphone noise reduction parameters according to the frequency response characteristics of the earphone secondary path determined in real time to obtain an audio output effect matched with the current sound field environment.

In conclusion, the front end of the sound field propagation direction of the loudspeaker single body is further fixedly provided with the microphone, so that the acoustic test can be independently completed.

After the loudspeaker is assembled on the earphone, the connecting arm in the form of the telescopic connecting rod can reduce the space of the inner cavity of the earphone, which is required to be occupied by the installation device, the assembly difficulty is reduced, and the consistency of the installation distance and the angle of the device in the assembly process is improved. Specifically, the method comprises the following steps: for active noise reduction earphones of different models, the loudspeaker can be adapted to the inner cavity structure of an earphone of any model by adjusting a plurality of degrees of freedom of the connecting arm; for the active noise reduction earphones of the same model, the loudspeaker avoids hardware errors such as assembly tolerance caused by the fact that the loudspeaker and the microphone are respectively installed through all degrees of freedom of the fixed connecting arm, and therefore batch earphone products have the consistent noise reduction effect. Besides, the active noise reduction earphone assembled with the loudspeaker can reduce noise based on parameters set in a unified mode when the earphone leaves a factory, and can further correct the frequency response characteristics of the secondary path of the earphone based on the sound field condition provided by the loudspeaker through a correction unit, so that under the condition that other non-uniformity factors still exist in the processes of structure assembly and the like, the influence of the non-uniformity of the structure on the noise reduction effect can be eliminated through correction parameters by each earphone, and the influence of the noise reduction parameters calibrated in batches when the earphone leaves the factory on the sound effect experience of a user due to the fact that the noise reduction parameters are not matched with the actual sound field path of the assembled earphone is avoided.

The above description is only an embodiment of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.

Claims (10)

1. A loudspeaker, comprising:

the loudspeaker unit (1) vibrates and produces sound through a vibrating diaphragm;

the microphone (2) is arranged on the front side of the vibrating diaphragm along the sound field propagation direction of the loudspeaker single body (1);

and the connecting arm (3) is connected between the horn single body (1) and the microphone (2) and fixes the microphone (2).

2. A loudspeaker according to claim 1, characterized in that the connecting arm (3) comprises:

a fixed arm (31), one end of which is fixedly connected with the horn single body (1);

and a telescopic arm (32) which is telescopically connected between the fixed arm (31) and the microphone (2) along the other end of the fixed arm (31).

3. A loudspeaker according to claim 2, characterised in that a steering lock shaft (33) is connected between the connecting arm (3) and the microphone (2) and has three rotational degrees of freedom for adjusting the relative angle between the diaphragm surface of the horn unit (1) and the sound-collecting surface of the microphone (2).

4. A loudspeaker according to claim 3, wherein the steering lock shaft (33) and the telescopic arm (32) are provided with respective locking portions, and in the locked state, the telescopic length of the link arm (3) and the link angle of the steering lock shaft (33) are kept fixed, respectively.

5. A loudspeaker according to claim 3, wherein the three directional rotational degrees of freedom comprise: the diaphragm is rotated forward or backward with respect to the diaphragm face, rotated leftward or rightward with respect to the diaphragm face, and rotated upward or downward with respect to the diaphragm face.

6. An active noise reducing headphone, comprising a loudspeaker according to any one of claims 1-5.

7. Active noise reducing earphone according to claim 6, characterized in that the telescopic length of the connecting arm (3) and the locking angle of the steering lock shaft (33) are kept the same in each active noise reducing earphone.

8. The active noise reduction earphone according to claim 6, wherein the microphone (2) is arranged in the inner cavity of the earphone close to the sound outlet, and is fixedly arranged between the diaphragm surface of the speaker unit (1) and the sound outlet.

9. The active noise reduction earphone according to claim 7, wherein a secondary path frequency response modification unit is disposed in the active noise reduction earphone, which is connected to the microphone (2), receives the feedback signal collected by the microphone (2), and outputs a secondary path frequency response modification signal for adjusting the earphone noise reduction parameters.

10. The active noise reduction earphone according to claim 6, wherein the sound collecting surface of the microphone (2) is arranged approximately perpendicular to the sound emitting direction of the speaker unit (1).

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