CN108322845B

CN108322845B - Noise reduction earphone

Info

Publication number: CN108322845B
Application number: CN201810393841.1A
Authority: CN
Inventors: 赵燕鹏; 房晓斐; 荆都; 史剑峰
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2020-05-15
Anticipated expiration: 2038-04-27
Also published as: CN108322845A

Abstract

The invention discloses a noise reduction earphone which comprises a left earphone, a right earphone and a noise reduction unit, wherein the left earphone and the right earphone respectively comprise earphone shells, a main microphone and an auxiliary microphone which are positioned outside an ear canal of a person, and a built-in microphone which is positioned inside the ear canal of the person, the main microphone and the auxiliary microphone pick up a first voice signal which is propagated through air, and after the noise reduction unit carries out noise reduction on the first voice signal, the noise reduction unit superposes the first voice signal with a second voice signal which is picked up by the built-in microphone and is propagated through a human body, so that a signal to be sent is generated. The noise reduction earphone of the invention performs noise reduction processing on the first voice signals picked up by the main microphone and the auxiliary microphone, and then superposes the first voice signals with the low-frequency second voice signals picked up by the built-in microphone, thereby obtaining high-quality voice signals.

Description

Noise reduction earphone

Technical Field

The invention relates to the technical field of earphones. And more particularly to a noise reducing headphone.

Background

At present, wireless earphones are generally provided with an uplink noise reduction function, and uplink noise reduction is realized, namely, conversation noise reduction is realized. When people make a call in the open air or in a noisy environment, if the noise is large, the sound of a user can be covered, so that the voice of the user cannot be heard by people at the other end of the call. However, when the noise of the noise reduction earphone is large on one side and small on the other side, it is often difficult to achieve a good noise reduction effect. For example, when a user uses such a noise reduction earphone to communicate in outdoor windy weather, the microphone of the earphone on the windward side picks up a large wind noise, but the wind noise on the windward side is small, which results in poor noise reduction effect of the earphone.

Therefore, there is a need to provide a noise reduction earphone to overcome the drawbacks of the prior art.

Disclosure of Invention

The invention aims to provide a noise reduction earphone with high conversation quality.

According to one aspect of the present invention, a noise reduction earphone is provided, including a left earphone, a right earphone and a noise reduction unit, where the left earphone and the right earphone each include an earphone housing, a main microphone and an auxiliary microphone located outside a human ear canal, and a built-in microphone located inside the human ear canal, the main microphone and the auxiliary microphone pick up a first voice signal propagated through air, and the noise reduction unit performs noise reduction on the first voice signal, and then superimposes the first voice signal with a second voice signal, which is picked up by the built-in microphone and is transmitted through a human body, so as to generate a signal to be transmitted.

Preferably, the primary microphone and the secondary microphone are both disposed on the earphone handle.

Preferably, the noise reduction unit performs noise reduction processing on the first voice signals picked up by the main microphone and the auxiliary microphone according to the phase difference.

Preferably, the distance between the main microphone and the auxiliary microphone is 20-30 mm.

Preferably, after the noise reduction unit detects that the noise signal at one side of the left receiver or the right receiver is greater than a preset threshold value, the main microphone and the auxiliary microphone at the corresponding side are closed, the built-in microphone is reserved to pick up the second voice signal, and the second voice signal is superposed with the noise-reduced voice signal at the other side to generate a signal to be sent.

Preferably, after the noise reduction unit detects that the noise signals on the two sides of the left receiver and the right receiver are both greater than a preset threshold value, the main microphones and the auxiliary microphones on the two sides are closed, the built-in microphones on the two sides are reserved, and second voice signals are picked up and superposed to generate signals to be sent.

Preferably, the noise reduction unit is accommodated in the earphone shell of the left earphone and/or the right earphone, and the left earphone is electrically connected with the right earphone through a cable.

The invention has the following beneficial effects:

the noise reduction earphone of the invention performs noise reduction processing on the first voice signals picked up by the main microphone and the auxiliary microphone, and then superposes the first voice signals with the low-frequency second voice signals picked up by the built-in microphone, thereby obtaining high-quality voice signals.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 shows a schematic structural diagram of the present invention.

Fig. 2 shows a partial schematic view of the invention.

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

As shown in fig. 1 and fig. 2, a noise reduction earphone includes a left earphone 1, a right earphone 2, and a noise reduction unit, where the left earphone 1 and the right earphone 2 each include an earphone housing 3, a main microphone 4, an auxiliary microphone 5, and a built-in microphone 6. The main microphone 4, the sub microphone 5, the built-in microphone 6, and the noise reduction unit are disposed in the earphone housing. The main microphone 4, the auxiliary microphone 5 and the built-in microphone 6 are electrically connected with the noise reduction unit. The main microphone 4 and the auxiliary microphone 5 are disposed outside the human ear canal to pick up a first voice signal propagated through air, the first voice signal including a noise signal of an external environment, and the built-in microphone 6 is disposed inside the human ear canal to pick up a second voice signal transmitted through a human skeleton. The noise reduction unit receives the first voice signals of the main microphone 4 and the auxiliary microphone 5, performs noise reduction according to a noise reduction algorithm, strengthens the voice signals, and then performs superposition processing on the voice signals and the second voice signals of the built-in microphone 6 to generate signals to be sent. The noise reduction unit is also used for sending the signal to be sent to the mobile terminal and broadcasting the signal through the mobile terminal. E.g., to a smartphone, tablet, etc. The noise reduction unit may be a DSP (digital signal processing) chip, or may be another chip with a storage function, and the corresponding algorithm is written into the chip.

Since the low frequency part (<1500Hz) of the human voice is mainly transmitted through the human body, and meanwhile, since the built-in microphone 6 is located inside the human ear canal isolating the external environment, the external wind noise is effectively shielded from entering the built-in microphone 6, and the built-in microphone 6 only picks up the low frequency part of the human voice, that is, the second voice signal only contains the low frequency part of the human voice. Therefore, after the noise reduction unit superposes the noise-reduced signal and the second voice signal picked up by the built-in microphone 6, a high-quality voice signal can be obtained, and the communication quality of the noise reduction earphone is improved.

As shown in fig. 2, in the present embodiment, the main microphone 4 and the sub-microphone 5 are further provided on the earphone handle, and the main microphone 4 and the sub-microphone 5 are spaced apart from each other by a predetermined distance. Because the main microphone 4 and the auxiliary microphone 5 have different distances from the mouth of a person, the first voice signals picked up by the main microphone 4 and the auxiliary microphone 5 have phase difference, and the noise signals basically have no phase difference, the noise reduction unit can identify the voice signals and the noise signals through the phase difference, and then eliminate the noise signals to obtain clear voice signals. In order to make the first voice signals picked up by the main microphone 4 and the auxiliary microphone 5 have a relatively significant phase difference, the distance between the main microphone 4 and the auxiliary microphone 5 is 20-30 mm. When the noise reduction earphone works, the noise reduction unit respectively carries out noise reduction processing on first voice signals picked up by the main microphone 4 and the auxiliary microphone 5 on the left receiver and the right receiver, and then the first voice signals are superposed with second voice signals picked up by the built-in microphones 6 on the two sides to obtain high-quality voice signals.

The noise reduction earphone of the present embodiment further sets a noise signal threshold in advance in the noise reduction unit, and when the noise reduction unit detects that the noise signal on one side is greater than the threshold, the noise reduction unit shields the first voice signal picked up by the main microphone 4 and the auxiliary microphone 5 on the side, and only receives the second voice signal picked up by the built-in microphone 6 on the side. And signals picked up by the main microphone 4 and the auxiliary microphone 5 at the other side which are smaller than the threshold value are subjected to noise reduction processing and then are superposed with second voice signals picked up by the built-in microphones 6 at the two sides to generate signals to be sent. The noise reduction unit shields signals picked up by the main microphone 4 and the auxiliary microphone 5 on the side with larger noise, so that the switching of noise reduction schemes due to different sizes of noise signals on two sides can be avoided, and the complexity of the noise reduction unit is reduced. The noise reduction earphone can avoid the occurrence of the condition that the noise reduction effect is obviously reduced when the noise signal at one side is overlarge due to the adoption of a noise reduction scheme.

Further, when the noise reduction unit detects that the noise signals on both sides are greater than the preset noise signal threshold, the noise reduction unit shields the first voice signals picked up by the main microphones 4 and the auxiliary microphones 5 on both sides, and only superimposes the second voice signals picked up by the built-in microphones 6 on both sides to generate a signal to be transmitted. The noise reduction earphone can avoid the occurrence of the condition that the noise reduction effect is obviously reduced due to the fact that the overall noise signal is larger when a noise reduction scheme is adopted.

Furthermore, the noise reduction unit can be accommodated in the left earpiece 1 or the right earpiece 2, and the left earpiece 1 and the right earpiece 2 are electrically connected through the cable 7.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims

1. A noise reduction earphone comprises a left earphone, a right earphone and a noise reduction unit, and is characterized in that the left earphone and the right earphone respectively comprise earphone shells, a main microphone and an auxiliary microphone which are positioned outside an ear canal of a person, and a built-in microphone which is positioned inside the ear canal of the person, the main microphone and the auxiliary microphone pick up a first voice signal propagated through the air, the noise reduction unit reduces the noise of the voice signal, the signal is superposed with a second voice signal which is picked up by the built-in microphone and is transmitted by the human body to generate a signal to be transmitted, after the noise reduction unit detects that the noise signal at one side of the left receiver or the right receiver is larger than a preset threshold value, and closing the main microphone and the auxiliary microphone on the corresponding sides, keeping the built-in microphone to pick up the second voice signal, and overlapping the second voice signal with the voice signal subjected to noise reduction on the other side to generate a signal to be sent.

2. The noise reducing headset of claim 1, wherein the primary microphone and the secondary microphone are both disposed on a headset stem.

3. The noise reduction headphone according to claim 2, wherein the noise reduction unit performs noise reduction processing on the first voice signals picked up by the main microphone and the auxiliary microphone according to the phase difference.

4. The noise reducing headset of claim 3, wherein the primary microphone is 20-30mm from the secondary microphone.

5. The noise reduction earphone according to claim 1, wherein after the noise reduction unit detects that the noise signals of both sides of the left earphone and the right earphone are greater than the preset threshold, the main microphone and the auxiliary microphone on both sides are turned off, and the built-in microphones on both sides are retained to pick up the second voice signal for superposition, thereby generating a signal to be transmitted.

6. The noise reduction earphone according to claim 1, wherein the noise reduction unit is accommodated in the earphone housing of the left earphone and/or the right earphone, and the left earphone and the right earphone are electrically connected through a cable.