WO2018149073A1

WO2018149073A1 - Noise-cancelling headphone and electronic device

Info

Publication number: WO2018149073A1
Application number: PCT/CN2017/089577
Authority: WO
Inventors: 赵燕鹏; 谢萍
Original assignee: 歌尔股份有限公司
Priority date: 2017-02-14
Filing date: 2017-06-22
Publication date: 2018-08-23
Also published as: CN106658265B; CN106658265A

Abstract

Provided are a noise-cancelling headphone and an electronic device. The noise-cancelling headphone comprises a headphone housing, a main microphone (15), a noise-cancelling microphone (16) and a main control chip (22). The main microphone (15), the noise-cancelling microphone (16) and the main control chip (22) are provided inside the headphone housing. The main microphone (15) and the noise-cancelling microphone (16) are in communication connection with the main control chip (22). The main microphone (15) is in communication with an external environment by means of a first sound-conducting tube (18). The noise-cancelling microphone (16) is in communication with the external environment by means of a second sound-conducting tube (20). The first sound-conducting tube (18) and the second sound-conducting tube (20) are isolated from each other. In the noise-cancelling headphone, a distance between the main microphone (15) and the noise-cancelling microphone (16) can be increased, thereby increasing a signal-to-noise ratio. The electronic device comprises the noise-cancelling headphone.

Description

Noise canceling headphones and electronic devices

Technical field

The present invention relates to the field of earphone technology, and more particularly to a noise canceling earphone and an electronic device to which the noise canceling earphone is applied.

Background technique

At present, wireless earphones generally have an uplink noise reduction function, and uplink noise reduction is call noise reduction. For example, when making a call in a noisy environment, the microphone receives the speech signal of the speaker and the noise signal of the surrounding environment, and the above two signals are transmitted to the noise reduction chip, and the noise reduction algorithm is used to filter out the environmental noise signal to ensure that the other party can still listen. To a clear voice signal.

The call noise reduction function is usually implemented by a single microphone/double microphone noise reduction algorithm.

The principle of the dual-mike noise reduction algorithm is as follows: the microphone close to the speaker's mouth is the main microphone, which is mainly used to pick up the human voice signal; the microphone near the human ear is the secondary microphone, which is mainly used for picking up noise and voice signals. The time when the speech signal reaches the main and sub-microphones is different due to the difference in distance, and the noise reduction algorithm performs noise suppression according to the time difference.

There are two key parameters for the noise reduction performance of the microphone array: one is the distance between the primary and secondary microphones, and the other is the angle between the secondary microphone array connection and the voice source (such as the mouth) to be enhanced. The distance between the main and sub-microphones is large, and the angle between the main and sub-microphones is small, so the noise reduction performance is good, and vice versa.

Due to the wireless earphone wearing and product design, the current wireless earphones are difficult to make a big breakthrough in the noise reduction performance of the call. The main reasons are: 1. The distance from the product to the mouth is far, and the conventional distance from the external ear canal to the center of the lips is about 130mm. This is also the distance between the center of the earphone wireless microphone or the microphone array to the center of the lip; 2. The center of the microphone or microphone array is almost picked up from the center of the lip, and the microphone array is connected to the microphone due to the stability requirements. The angle of the line between the array and the center of the lips is usually larger than 30 degrees.

The current wireless earphones are small in size, and the distance between the primary and secondary microphones is difficult to meet the minimum distance. From the request. Due to the size of the main microphone, the main microphone is far from the mouth and the call quality is not good.

Summary of the invention

It is an object of the present invention to provide a new technical solution for a noise canceling earphone.

According to a first aspect of the invention, a noise canceling earphone is provided. The earphone includes a headphone housing, a main microphone, a noise reduction microphone and a main control chip, the main microphone, the noise reduction microphone and the main control chip are disposed in the earphone housing, the main microphone and the main microphone a noise reduction microphone is communicatively coupled to the main control chip, the main microphone is in communication with an external environment through a first sound tube, and the noise reduction microphone is in communication with an external environment through a second sound tube, the first sound tube Separated from the second sound tube.

Optionally, a printed circuit board integrated with the main control chip is further included, and the main microphone and the noise reduction microphone are connected to the printed circuit board.

Optionally, the first open end of the first sound tube is located at the bottom of the earphone housing.

Optionally, the second open end of the second sound tube is located at the top of the earphone housing.

Optionally, an inner diameter of at least one of the first sound tube and the second sound tube is configured to gradually decrease from an open end to an end connected to the microphone.

Optionally, the noise reduction microphones are multiple, each of the noise reduction microphones is in communication with an external environment through a respective second sound tube, and the plurality of second sound tubes are isolated from each other.

Optionally, a distance between the first open end of the first sound tube and the second open end of the second sound tube is greater than or equal to 20 mm.

Optionally, the first open end of the first sound tube is disposed opposite to the second open end of the second sound tube.

Optionally, a sensor is further disposed on the earphone housing and communicatively coupled to the main control chip, the sensor being configured to contact a user's ear to pick up bone conduction speech The signal is sent to the master chip.

According to another aspect of the present invention, an electronic device is provided. The device includes the noise canceling earphone provided by the present invention.

The inventors of the present invention have found that in the prior art, the size of the wireless earphone is small, and the distance between the primary and secondary microphones is difficult to meet the minimum distance requirement. And subject to the size of the main microphone, The main microphone is far from the mouth and the call quality is not good. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.

The noise canceling earphone provided by the invention can improve the distance between the main microphone and the noise canceling microphone by setting the path and the length of the first sound guiding tube and the second sound guiding tube, thereby making the noise reduction effect of the noise canceling earphone Better, improve the signal to noise ratio.

In addition, by setting the positions of the first open end of the first sound tube and the second exit end of the second sound tube, the angle between the microphone array connection and the microphone-mouth connection can be made smaller. The noise reduction effect is further improved.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a schematic structural view of a noise canceling earphone according to an embodiment of the present invention.

2 is a schematic diagram of a noise canceling earphone when worn according to an embodiment of the present invention.

3 is a flow chart of a noise reduction process in accordance with an embodiment of the present invention.

Description of the reference signs:

11: earplug; 12: rear cavity; 13: front sound tube; 14: PCB; 15: main microphone; 16: noise canceling microphone; 17: sensor; 18: first sound tube; 19: first open end; 20: second sound tube; 21: second open end; 22: main control chip; 23: dustproof member; 24: skin inside the ear canal.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention unless otherwise specified.

The following description of at least one exemplary embodiment is merely illustrative and is in no way Any limitations to the invention and its application or use.

Techniques, methods and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but the techniques, methods and apparatus should be considered as part of the specification, where appropriate.

In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

According to an embodiment of the present invention, a noise canceling earphone is provided. For example, the noise canceling earphone can be a wireless earphone or a wired earphone. Since the setting space of the wireless earphone is smaller, the noise canceling earphone is particularly suitable for the wireless earphone. In terms of wearing form, the noise canceling earphone can be an in-ear earphone, an over-ear earphone or a headset.

The noise canceling earphone includes a headphone housing, a main microphone 15, a noise canceling microphone 16, and a main control chip 22. The main microphone 15, the noise reduction microphone 16, and the main control chip 22 are disposed in the earphone housing. The main microphone 15 and the noise reduction microphone 16 are communicatively coupled to the main control chip 22. The main microphone 15 is used to pick up a voice signal and transmit the signal to the master chip 22. The main microphone 15 inevitably picks up and transmits a noise signal. The noise reduction microphone 16 is used to pick up the voice signal and the noise signal of the surrounding environment, and send the two signals to the master chip 22. The master chip 22 receives signals from the main microphone 15 and the noise reduction microphone 16, performs noise reduction according to the noise reduction algorithm, and enhances the voice signal. The main control chip 22 is further configured to send the noise reduction processed voice signal to the mobile terminal for playing by the mobile terminal. For example, send it to a smartphone, tablet, etc.

The noise reduction algorithm is a conventional technical means in the art, and those skilled in the art can select a noise reduction algorithm according to actual needs, which will not be described in detail herein.

In the present invention, the main microphone 15 is in communication with the external environment through the first sound tube 18. The noise reduction microphone 16 communicates with the external environment through the second sound tube 20, and the first sound tube 18 and the second sound tube 20 are isolated from each other.

The noise canceling earphone provided by the present invention can increase the distance between the main microphone 15 and the noise canceling microphone 16 by setting the path and length of the first sound guiding tube 18 and the second sound guiding tube 20. Therefore, the noise reduction effect of the noise canceling earphone is better, and the signal to noise ratio is improved.

Preferably, the distance between the first open end 19 of the first sound tube 18 and the second open end 21 of the second sound tube 20 is greater than or equal to 20 mm. This distance ensures good noise reduction.

Furthermore, by arranging the positions of the first open end 19 of the first sound tube 18 and the second exit portion of the second sound tube 20, the angle between the microphone array connection and the microphone-mouth connection can be made. It becomes smaller and further improves the noise reduction effect.

Further, since the main microphone 15 and the noise reduction microphone 16 are respectively communicated with the outside through the sound tube, the arrangement of the main microphone 15 and the noise reduction microphone 16 can be free from the installation space.

Further, since it is not affected by the mounting position of the main microphone 15, the person skilled in the art can set the first open end 19 of the first sound guiding tube 18 to an arbitrary position to be close to the mouth of the user, thereby improving the pickup of the main microphone 15. The effect of the voice.

As shown in FIG. 1, the noise canceling earphone is a wireless earphone. In the noise canceling earphone, the earphone housing is an earplug. The inside of the earplug has a receiving space. The accommodation space is divided into a rear chamber 12 and a front sound tube 13 that communicates with the rear chamber 12. The rear chamber 12 is for accommodating various components and can improve the low frequency effect of the noise canceling headphone, and the front sound tube 13 communicates with a speaker (not shown) to transmit sound. A power supply assembly and a switch are also disposed within the rear chamber 12. For example, the power supply assembly includes a lithium ion battery. The lithium ion battery supplies power to the speaker, the main microphone 15, the noise reduction microphone 16, and the main control chip 22 through the power management circuit.

The noise canceling headphone further includes a printed wiring board (PCB 14) integrated with the master chip 22. The main microphone 15 and the noise reduction microphone 16 are connected to the printed wiring board. In this way, the integration degree of the noise canceling earphone is greatly improved, and the development trend of miniaturization and thinning of the electronic device is followed. Moreover, the PCB 14 makes the communication effect between the main microphone 15, the noise reduction microphone 16, and the main control chip 22 better.

For example, the main control chip 22 may select a DSP (Digital Signal Processing) chip, or another chip with a storage function, and the corresponding algorithm program may be written into the main control chip 22.

For example, the main microphone 15 and the noise reduction microphone 16 can be directly fixed at any position of the PCB 14 according to actual needs, thereby being free from the installation space. For example, two microphones are set Placed on the same side of the PCB 14 to facilitate the placement of two sound tubes in communication with the two microphones.

For example, the speaker is also integrated into the PCB 14 board, and the speaker is communicatively coupled to the master chip 22.

In one example, as shown in FIG. 1, the first sound tube 18 and the second sound tube 20 are each arranged in an arc shape. The curved structure has a smooth path to facilitate the transmission of sound signals (including speech signals and noise signals) in the two sound tubes. Further, in order to increase the distance between the main microphone 15 and the noise reduction microphone 16, the two sound tubes may also be provided in a shape such as a spiral shape, a polygonal line shape, a wavy line shape or the like.

In one example, the inner diameter of at least one of the first sound tube 18 and the second sound tube 20 is configured to gradually decrease from the open end to the end that is coupled to the microphone. As shown in FIG. 1, the first sound tube 18 and the second sound tube 20 are each provided in a structure having a reduced diameter. Both sound tubes are circular in cross section. The diameter of the first sound guiding tube 18 is gradually reduced from the first open end 19 toward the main microphone 15, and the diameter of the second sound guiding tube 20 is gradually reduced from the second open end 21 toward the noise canceling microphone 16. This structure is similar to a trumpet shape, which guarantees good sound and noise pickup quality.

In this example, when the main microphone 15 is picked up, the sound signal sequentially passes through the first open end 19, the first sound tube 18, and the main microphone 15 to reach the main control chip 22. When the noise reduction microphone 16 picks up, the sound signal sequentially passes through the second open end 21, the second sound tube 20, and the noise reduction microphone 16 to reach the main control chip 22. The main control chip 22 processes the two signals according to the built-in noise reduction algorithm, and finally reduces the noise to obtain a speech signal.

Further, a dustproof member 23 is provided in at least one of the first sound guiding tube 18 and the second sound guiding tube 20. For example, dustproof members 23 are provided in both of the sound tubes to prevent dust from entering. The dustproof member 23 may be, but not limited to, a foam, a sponge, or the like.

In one example, the first open end 19 of the first sound tube 18 is located at the bottom of the earphone housing. This position is close to the user's mouth, which makes the pickup of the voice better.

In one example, the second open end 21 of the second sound tube 20 is located at the top of the earphone housing. This position guarantees the quality of noise pickup. Moreover, when the first open end 19 is at the bottom, the distance between the second open end 21 and the first open end 19 is the largest, which avoids the mutual influence of the two, and can ensure a good noise reduction effect.

In one example, the first open end 19 of the first sound tube 18 is disposed opposite the second open end 21 of the second sound tube 20. This setting can effectively avoid the mutual influence of the two microphones.

In one example, the noise canceling microphone 16 also includes a sensor 17. The sensor 17 is disposed on the earphone housing and is communicatively coupled to the main control chip 22. The sensor 17 is configured to contact the ear of the user to pick up the bone conduction voice signal and transmit the voice signal to the master chip 22. For example, as shown in Figures 1 and 2, the sensor 17 is disposed within the front sound tube 13. When the earplug is inserted into the ear canal, the sensor 17 is in contact with the skin 24 inside the ear canal.

The user sends a voice signal, and the vibration of the vocal cords is transmitted to the human ear through bone conduction, which causes the capillary changes in the human ear to change accordingly. Then, the sensor 17 is in close contact with the human ear, picks up the change of the blood information caused by the voice utterance, and transmits the picked up blood information to the main control chip 22 in the earplug. The main control chip 22 analyzes the blood information to finally obtain the user's voice signal. Since the blood signal does not fluctuate due to strong external noise, the indirect acquisition of the speech signal by the sensor 17 can ensure the accurate transmission of the speech signal and avoid the influence of the external noise signal on the call quality.

The master chip 22 optimizes the voice signal picked up by the sensor 17 and the voice signal picked up by the main microphone 15, and finally obtains an accurate voice signal. This method improves the accuracy of voice signal pickup.

In one example, the noise reduction microphones 16 are plural, and each of the noise reduction microphones 16 is provided with a second sound guiding tube, and the plurality of second sound guiding tubes are isolated from each other. For example, a plurality of noise reduction microphones 16 are integrated onto the PCB 14. The second open ends 21 of the plurality of second sound guiding tubes are arranged on the same line, and the plurality of second open ends 21 are arranged on the same line as the first open end 19 of the first sound guiding tube. This makes the speech signal picked up by the noise canceling microphone 16 more accurate. The adjacent second open ends 21 are spaced apart by a set distance or a set angle to make the picked up noise signal and voice signal more accurate.

The noise signal and the voice signal picked up by the plurality of noise reduction microphones 16 are processed by the DSP to obtain a more accurate noise signal. Then through the DSP built-in noise reduction algorithm, the noise signal is finally eliminated, and a clearer and more accurate voice signal is obtained.

According to another embodiment of the present invention, an electronic device is provided. The electronic device includes the noise canceling earphone provided by the present invention. The electronic device can be, but is not limited to, a mobile phone, a notebook computer, Tablets, radios, smart watches, smart glasses, PSPs, virtual reality devices (VRs) or augmented reality devices (ARs).

The electronic device has the characteristics of good voice effect.

While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A noise canceling earphone, comprising: a headphone housing, a main microphone (15), a noise reduction microphone (16) and a main control chip (22), the main microphone (15), the noise reduction microphone (16) And the main control chip (22) is disposed in the earphone housing, the main microphone (15) and the noise reduction microphone (16) are communicatively connected with the main control chip (22), the main The microphone (15) is in communication with an external environment through a first sound tube (18), and the noise reduction microphone (16) is in communication with an external environment through a second sound tube (20), the first sound tube (18) Separated from the second sound tube (20).
The noise canceling earphone according to claim 1, further comprising a printed circuit board integrated with said main control chip (22), said main microphone (15) and said noise reduction microphone (16) The printed circuit boards are connected together.
The noise canceling earphone according to claim 1 or 2, characterized in that the first open end (19) of the first sound guiding tube (18) is located at the bottom of the earphone housing.
The noise canceling earphone according to any one of claims 1 to 3, characterized in that the second open end (21) of the second sound tube (20) is located at the top of the earphone housing.
The noise canceling earphone according to any one of claims 1 to 4, wherein an inner diameter of at least one of the first sound guiding tube (18) and the second sound guiding tube (20) is It is configured to gradually decrease from the open end to the end connected to the microphone.
The noise canceling earphone according to any one of claims 1 to 5, wherein the noise reduction microphone (16) is plural, and each of the noise reduction microphones (16) passes each of the first The two sound guiding tubes (20) are in communication with the external environment, and the plurality of the second sound guiding tubes (20) are isolated from each other.
The noise canceling earphone according to any one of claims 1 to 6, characterized in that the first open end (19) of the first sound guiding tube (18) and the second sound guiding tube (20) The distance between the second open ends (21) is greater than or equal to 20 mm.
The noise canceling earphone according to any one of claims 1 to 7, characterized in that the first open end (19) of the first sound guiding tube (18) and the second sound guiding tube (20) The second open ends (21) are disposed opposite each other.
A noise canceling earphone according to any one of claims 1-8, further comprising a sensor (17) disposed on the earphone housing and with the main The control chip (22) is communicatively coupled, the sensor (17) being configured to contact the ear of the user to pick up a bone conduction voice signal and transmit the voice signal to the master chip (22).
An electronic device comprising the noise canceling earphone of any one of claims 1-9.