CN112399301B - Earphone and noise reduction method - Google Patents
Earphone and noise reduction method Download PDFInfo
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- CN112399301B CN112399301B CN202011299885.1A CN202011299885A CN112399301B CN 112399301 B CN112399301 B CN 112399301B CN 202011299885 A CN202011299885 A CN 202011299885A CN 112399301 B CN112399301 B CN 112399301B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
Abstract
The application discloses an earphone and a noise reduction method, wherein the earphone comprises a first microphone, a second microphone, an ENC module, an ANC module, a first multiplexing module and a second multiplexing module; the first multiplexing module is used for respectively inputting the first audio signals collected by the first microphone into the ENC module and the ANC module; the second multiplexing module is used for respectively inputting a second audio signal acquired by the second microphone into the ENC module and the ANC module; the ENC module is used for analyzing and processing the first audio signal and the second audio signal, filtering noise except the voice in the first audio signal and the second audio signal, and outputting a third audio signal conforming to the voice model; and the ANC module is used for generating and outputting a noise reverse phase signal based on the input first audio signal and the input second audio signal.
Description
Technical Field
The application relates to the technical field of earphones, in particular to an earphone and a noise reduction method.
Background
The Environmental Noise Control (ENC) refers to a call Noise reduction technology that reduces environmental Noise after data collected by a single or multiple microphones at a call uplink end is processed by an algorithm, and keeps the voice of a wearer to be transmitted to a far end, so that the opposite party can listen more clearly during a call. In the related art, in order to obtain a good ENC performance of a True Wireless Stereo (TWS) headphone, at least two audio signals are required, and thus, at least two Microphones (MICs), for example, a Voice (Voice) MIC and a FeedForward (FF) noise reduction MIC, need to be provided on the TWS headphone.
However, since both Voice MIC and FF MIC are exposed to the outside when in use and are greatly influenced by wind Noise, in order to improve the wind Noise resisting effect of the TWS headset, an Active Noise Control (ANC) technology may be used on the TWS headset, that is, a Noise reduction technology in which ambient Noise is collected by a microphone, and Anti-Noise sound waves with the same frequency and amplitude and opposite phase to Noise are emitted through a headset speaker to interfere with the Noise to achieve phase cancellation is provided, so as to reduce the influence of external Noise on a wearer. For better ANC effect, hybrid (Hybrid) noise reduction, i.e., feedforward noise reduction and Feedback (FB) noise reduction, are used in the related art, and therefore, at least two microphones FF MIC and FB MIC need to be provided on the TWS headset.
It can be seen that in the related art, in order to use both ENC and ANC functions, at least three microphones need to be arranged on the TWS headset, resulting in high cost and power consumption of the TWS headset.
Disclosure of Invention
The embodiment of the application aims to provide an earphone and a noise reduction method, which can reduce the corresponding cost and power consumption of the earphone.
In order to solve the technical problem, the following technical scheme is adopted in the application:
in a first aspect, an embodiment of the present application discloses an earphone, including: the system comprises a first microphone, a second microphone, an Environmental Noise Control (ENC) module, an Active Noise Control (ANC) module, a first multiplexing module and a second multiplexing module; the first multiplexing module is connected with the first microphone, and the first multiplexing module is respectively connected with the ENC module and the ANC module; the second multiplexing module is connected with the second microphone, and the second multiplexing module is respectively connected with the ENC module and the ANC module; the first multiplexing module is used for inputting the first audio signal collected by the first microphone into the ENC module and the ANC module respectively; the second multiplexing module is used for inputting a second audio signal collected by the second microphone into the ENC module and the ANC module respectively; the ENC module is used for analyzing and processing the first audio signal and the second audio signal, filtering noise except human voice in the first audio signal and the second audio signal, and outputting a third audio signal conforming to a human voice model; the ANC module is used for generating and outputting a noise inverse signal based on the input first audio signal and the input second audio signal.
In a second aspect, an embodiment of the present application discloses a noise reduction method, including: when active noise reduction is executed, analyzing and processing are carried out according to a first audio signal collected by a first microphone of the earphone and a second audio signal collected by a second microphone of the earphone, noise except human voice in the first audio signal and the second audio signal is filtered, and a third audio signal conforming to a human voice model is output; generating a noise inverted signal based on the first audio signal and the second audio signal when performing ambient noise reduction.
In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method according to the second aspect.
In a fourth aspect, the present embodiments provide a computer-readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the second aspect.
In a fifth aspect, the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the second aspect.
The technical scheme adopted by the application can achieve the following beneficial effects:
according to the earphone disclosed by the embodiment of the application, only two microphones need to be arranged, the first multiplexing module and the second multiplexing module copy audio signals collected by the two microphones into two paths of same electric signals respectively, and the two paths of same electric signals are input into the ENC module and the ANC module respectively to be processed by related algorithms. Therefore, the ENC effect and the ANC effect can be simultaneously realized through the two microphones, and the corresponding cost and power consumption of the earphone are reduced.
Drawings
Fig. 1 is a schematic structural diagram of a headset disclosed in an embodiment of the present application;
fig. 2 is a schematic structural diagram of an earphone disclosed in the embodiment of the present application;
fig. 3 is a schematic structural diagram of a headset disclosed in the embodiment of the present application;
fig. 4 is a schematic external view of a headset according to an embodiment of the present application;
FIG. 5 is a flow chart of a noise reduction method disclosed in an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. 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 application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.
The following describes an earphone provided in the embodiments of the present application in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a headset disclosed in an embodiment of the present application, and as shown in fig. 1, the headset mainly includes a first microphone 110, a second microphone 120, an ENC module 310, an ANC module 320, a first multiplexing module 210, and a second multiplexing module 220. One end of the first multiplexing module 210 is connected to the first microphone 110, and the other end is connected to the ENC module 310 and the ANC module 320, respectively; the second multiplexing module 220 has one end connected to the second microphone 120 and the other end connected to the ENC module 310 and the ANC module 320, respectively.
The headset in the embodiment of the present application only needs two microphones, and therefore, the headset may be referred to as a dual microphone.
In this embodiment, the first microphone 110 is used for collecting a first audio signal and inputting the first audio signal to the first multiplexing module 210. The first multiplexing module 210 is connected to the first microphone 110, and is configured to input the first audio signal collected by the first microphone 110 to the ENC module 310 and the ANC module 320, respectively. For example, the first multiplexing module 210 may generate two identical signals from the received first audio signal, i.e., two first audio signals, one input to the ENC module 310 and one input to the ANC module 320. The second microphone 120 is configured to collect a second audio signal, and input the collected second audio signal to the second multiplexing module 220. The second multiplexing module 220 is connected to the second microphone 120, and configured to input the second audio signal collected by the second microphone 120 to the ENC module 310 and the ANC module 320, respectively. For example, the second multiplexing module 220 may generate two identical signals from the received second audio signal, i.e., two second audio signals, one input to the ENC module 310 and one input to the ANC module 320.
The ENC module 310 is configured to analyze and process the received first audio signal and the second audio signal, filter noise other than the voice in the first audio signal and the second audio signal, and output a third audio signal conforming to a voice model, thereby implementing uplink noise reduction in the call. The ANC module 320 is configured to generate and output a noise inverse signal based on the input first audio signal and the second audio signal.
In a specific application, the ENC module 310, the ANC module 320, the first multiplexing module 210, and the second multiplexing module 220 may be implemented by a Digital Signal Processing (DSP) chip, but the present invention is not limited thereto.
In the embodiment of the present application, two microphones, namely, the first microphone 110 and the second microphone 120, may be used to implement both the ENC call noise reduction of a dual-microphone headset and the hybrid ANC function, so as to reduce the headset cost and power consumption.
In this embodiment, the first multiplexing module 210 and the second multiplexing module 220 may be a Multiplexer (MUX), and the MUX is configured to copy an input signal and output two identical electrical signals.
In a possible implementation manner, as shown in fig. 2, the earphone may further include a codec module 500 and a speaker module 600, where the codec module 500 is connected to the ANC module 320, the speaker module 600 is connected to the codec module 500, and the codec module 500 is configured to perform digital-to-analog conversion on a noise inverse signal generated and output by the ANC module 320, and transmit the converted noise inverse signal to the speaker module 600 for playing. Through this possible implementation manner, the noise-inverted signal is output to the speaker module 600 for playing, so that the speaker module 600 can play a signal inverted to the noise, and further cancel the noise in the audio signal played by the speaker module 600.
In practical applications, the speaker module 600 can be a playing device such as a speaker.
In the foregoing possible implementation manner, optionally, as shown in fig. 3, the headset may further include a wireless transmission module 410, where the wireless transmission module 410 is connected to the codec module 500 and the ENC module 310, and is configured to receive a fourth externally transmitted audio signal, transmit the fourth audio signal to the codec module 500, and transmit the fourth audio signal to the ENC module 310; the ENC module 310 may be further configured to perform echo cancellation on the first audio signal and the second audio signal using the received fourth audio signal as an echo reference signal. In this possible implementation manner, the codec module 500 may be further configured to perform digital-to-analog conversion on the fourth audio signal and transmit the fourth audio signal to the speaker module 600 for playing. That is to say, in this optional implementation manner, when noise other than human voice in the first audio signal and the second audio signal is filtered, the echoes in the first audio signal and the second audio signal may also be cancelled according to the fourth audio signal, so that noise in the output third audio signal is smaller.
Optionally, the wireless transmission module 410 may be a bluetooth module, and certainly, the wireless transmission module 410 is not limited thereto, and in practical application, the wireless transmission module 410 may also be other short-distance wireless transmission modules, and the embodiment of the present application is not limited thereto.
The fourth audio signal may be an audio signal transmitted to the headset by the terminal connected to the headset through the transmission module 410, for example, the fourth audio signal may be music played by the terminal through an audio playing application program, or an audio signal transmitted to the terminal by the opposite terminal in a call, and the like.
In a possible implementation manner, the ENC module 310 may be further configured to output a third audio signal to the codec module 500, where the codec module 500 performs digital-to-analog conversion on the third audio signal, and outputs the converted third audio signal to the speaker module 600 for playing. In this possible implementation manner, the third audio signal subjected to the noise reduction processing by the ENC module 310 is transmitted to the speaker module 600 for playing, so that the user can hear a clearer sound input by the user.
In a possible implementation manner of the embodiment of the present application, the wireless transmission module 410 is further configured to receive a third audio signal output by the ENC module 310 and transmit the third audio signal to an external device. For example, the third audio signal may be a voice signal input by a user and subjected to noise reduction by the ENC module 310 during a call, and the wireless transmission module 410 transmits the third audio signal to an external device, such as a call terminal, and the call terminal sends the third audio signal to a call peer end, so that the definition of the audio signal received by the call peer end may be improved.
In one possible implementation, the first microphone 110 may be disposed at an ear inlet of the headset and the second microphone 120 may be disposed at an ear stem of the headset, as shown in fig. 4. In this possible implementation, since the first microphone 110 is in the ear canal when the earphone is worn, the wind noise interference is small, and therefore, with this possible implementation, it is possible to make the noise reduction by ENC resistant to stronger wind noise interference.
The first microphone 110 may be an FB microphone in the related art.
In the related art, the FF microphone of the hybrid ANC is used to collect the ambient noise outside the ear canal, and the FF microphone and the Voice microphone are located in a similar sound field, so in the embodiment of the present application, the Voice microphone (i.e., the second microphone 120) is used to collect the ambient noise instead of the FF microphone for ANC noise reduction.
In the above possible implementation, the second microphone 120 may not be located at the same position as the Voice microphone in the related art, but may be located at a middle position between the FF microphone and the Voice microphone in the related art, and thus, the second microphone 120 may be optionally disposed at a middle position of the ear stem. By placing the second microphone 120 in the middle of the ear stem, both ENC and ANC effects can be achieved.
Alternatively, the second microphone 120 may be disposed at a position where the rear end of the earphone is as close as possible to the mouth of the wearer, and may achieve both ANC and ENC effects. In this possible scheme, the ANC and ENC effects can be considered simultaneously by two microphones, i.e., the first microphone 110 and the second microphone 120, so that the corresponding cost and power consumption of the headset are reduced, and the noise reduction and wind noise resistance of the call are improved.
In the embodiment of the present application, the first microphone 110 transmits the collected first audio signal to the first multiplexing module 210, the first multiplexing module 210 generates two identical signals from the first audio signal, one signal is transmitted to the ANC module 320, the other signal is transmitted to the ENC module 310, the ENC module 310 analyzes and processes the collected sound, a model conforming to human voice is reserved, and uplink noise reduction in the call is achieved. The ANC module 320 generates and outputs a noise inverse signal based on the input first and second audio signals, thereby implementing active noise reduction. Therefore, by adopting the earphone provided by the embodiment of the application, the environmental noise reduction and the active noise reduction can be realized through the two microphones, so that the cost and the process complexity of the earphone can be reduced.
The embodiment of the application also provides a noise reduction method, which can be applied to the earphones in the above embodiments.
Fig. 5 is a flowchart of a noise reduction method according to an embodiment of the present application, and as shown in fig. 5, the noise reduction method mainly includes the following steps.
S510, when active noise reduction is executed, analyzing and processing are carried out according to a first audio signal collected by a first microphone of the earphone and a second audio signal collected by a second microphone of the earphone, noise except for human voice in the first audio signal and the second audio signal is filtered, and a third audio signal which accords with a human voice model is output.
In a specific application, step S510 may be performed by the ENC module 310 shown in fig. 1 to fig. 3, and a specific implementation manner may refer to the description in the foregoing earphone embodiment, which is not described herein again.
And S520, generating a noise inverted signal based on the first audio signal and the second audio signal when environmental noise reduction is executed.
In a specific application, step S520 may be performed by the ANC module 320 shown in fig. 1 to 3, and a specific implementation manner may refer to the description in the above earphone embodiment, which is not described herein again.
By the noise reduction method provided by the embodiment of the application, the ambient noise reduction and the active noise reduction can be performed according to the first audio signal and the second audio signal acquired by the first microphone and the second microphone. Therefore, by adopting the scheme provided by the embodiment of the application, the environment noise reduction and the active noise reduction can be realized by only arranging two microphones through the earphone, so that the cost and the process complexity of the earphone can be reduced.
In one possible implementation, after generating the noise-inverted signal, the method may further include: and after the noise reversed-phase signal is subjected to digital-to-analog conversion, the converted noise reversed-phase signal is transmitted to a loudspeaker module of the earphone to be played. Through the possible implementation mode, when the loudspeaker module plays audio, noise in the played audio is offset by simultaneously playing the noise phase-inverted signal, and active noise reduction is realized.
In one possible implementation, the method may further include:
step 1, receiving a fourth audio signal transmitted from the outside;
for example, the earphone receives an audio signal (which may be played music or voice of the opposite end during a call) sent by the connected terminal.
After receiving the fourth audio signal, the fourth audio signal may also be subjected to digital-to-analog conversion, and then the converted audio signal is transmitted to the speaker module for playing.
And 2, taking the fourth audio signal as an echo reference signal, and performing echo cancellation on the first audio signal and the second audio signal.
In the possible implementation manner, when noise other than human voice in the first audio signal and the second audio signal is filtered, the echo in the first audio signal and the second audio signal may also be cancelled according to the fourth audio signal, so that noise in the output third audio signal is smaller.
In one possible implementation, the method may further include: and D/A conversion is carried out on the third audio signal, and the converted noise reversed-phase signal is transmitted to a loudspeaker module of the earphone to be played. In the possible implementation mode, the third audio signal subjected to the noise reduction processing is transmitted to the loud speaker module to be played, so that a user can hear clearer sound input by the user.
Optionally, an electronic device is further provided in this embodiment of the present application, as shown in fig. 6, the electronic device may include a processor 610, a memory 609, and a program or an instruction stored in the memory 609 and capable of running on the processor 610, where the program or the instruction is executed by the processor 610 to implement each process of the noise reduction method embodiment, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the process of the embodiment of the noise reduction method is implemented, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the above noise reduction method embodiment, and can achieve the same technical effect, and the details are not repeated here to avoid repetition.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. An earphone, comprising: the system comprises a first microphone, a second microphone, an ambient noise control ENC module, an active noise control ANC module, a first multiplexing module and a second multiplexing module;
the first multiplexing module is connected with the first microphone, and the first multiplexing module is respectively connected with the ENC module and the ANC module; the second multiplexing module is connected with the second microphone, and the second multiplexing module is respectively connected with the ENC module and the ANC module; wherein, the first and the second end of the pipe are connected with each other,
the first multiplexing module is used for inputting the first audio signal collected by the first microphone into the ENC module and the ANC module respectively;
the second multiplexing module is used for inputting a second audio signal collected by the second microphone into the ENC module and the ANC module respectively;
the ENC module is used for analyzing and processing the first audio signal and the second audio signal, filtering noise except the human voice in the first audio signal and the second audio signal, and outputting a third audio signal conforming to a human voice model;
the ANC module is used for generating and outputting a noise reverse phase signal based on the input first audio signal and the input second audio signal;
the first multiplexing module and the second multiplexing module are multiplexers.
2. The headset of claim 1, further comprising: a coding and decoding module and a loudspeaker module, wherein,
the encoding and decoding module is connected with the ANC module, and the speaker module and the encoding and decoding module are connected to the encoding and decoding module;
and the coding and decoding module is used for carrying out digital-to-analog conversion on the noise reversed-phase signal and transmitting the converted noise reversed-phase signal to the loudspeaker module for playing.
3. The headset of claim 2, further comprising: a wireless transmission module, wherein,
the wireless transmission module is connected with the coding and decoding module and the ENC and is used for receiving a fourth audio signal transmitted from the outside, transmitting the fourth audio signal to the coding and decoding module and transmitting the fourth audio signal to the ENC module;
the ENC module is further configured to perform echo cancellation on the first audio signal and the second audio signal by using the fourth audio signal as an echo reference signal.
4. The headset of claim 2,
the ENC module is further configured to output the third audio signal to the codec module;
the coding and decoding module is further configured to perform digital-to-analog conversion on the third audio signal, and output the converted third audio signal to the speaker module for playing.
5. The headset of any one of claims 1 to 4, wherein the first microphone is disposed at an ear inlet of the headset and the second microphone is disposed at an ear stem of the headset.
6. The headset of claim 5, wherein the second microphone is disposed at a medial position of the ear stem.
7. The headset of claim 5, wherein the first microphone 110 is proximate to a speaker module of the headset.
8. A noise reduction method applied to the earphone according to any one of claims 1 to 7, wherein the method comprises:
when environmental noise reduction is executed, analyzing and processing are carried out according to a first audio signal collected by a first microphone of the earphone and a second audio signal collected by a second microphone of the earphone, noise except human voice in the first audio signal and the second audio signal is filtered, and a third audio signal conforming to a human voice model is output;
in performing active noise reduction, a noise-inverted signal is generated based on the first audio signal and the second audio signal.
9. The method of claim 8, wherein after generating the noise inverted signal, the method further comprises:
and after the noise reversed-phase signal is subjected to digital-to-analog conversion, the converted noise reversed-phase signal is transmitted to a loudspeaker module of the earphone to be played.
10. The method of claim 9, further comprising:
receiving an externally transmitted fourth audio signal;
and taking the fourth audio signal as an echo reference signal, and performing echo cancellation on the first audio signal and the second audio signal.
11. The method of any one of claims 8 to 10, further comprising: and D/A conversion is carried out on the third audio signal, and the converted noise reversed-phase signal is transmitted to a loud-speaking module of the earphone to be played.
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| CN202011299885.1A CN112399301B (en) | 2020-11-18 | 2020-11-18 | Earphone and noise reduction method |
| PCT/CN2021/130377 WO2022105690A1 (en) | 2020-11-18 | 2021-11-12 | Earphone and noise reduction method |
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| CN112399301B (en) * | 2020-11-18 | 2023-03-17 | 维沃移动通信有限公司 | Earphone and noise reduction method |
| CN113611320B (en) * | 2021-04-07 | 2023-07-04 | 珠海市杰理科技股份有限公司 | Wind noise suppression method, device, audio equipment and system |
| CN113132846A (en) * | 2021-04-13 | 2021-07-16 | 北京安声科技有限公司 | Active noise reduction method and device of earphone and semi-in-ear active noise reduction earphone |
| CN113676816A (en) * | 2021-09-26 | 2021-11-19 | 惠州市欧迪声科技有限公司 | Echo eliminating method for bone conduction earphone and bone conduction earphone |
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| CN206698401U (en) * | 2017-04-18 | 2017-12-01 | 恒玄科技（上海）有限公司 | A kind of earphone for realizing diamylose gram noise reduction |
| CN108429950A (en) * | 2018-03-22 | 2018-08-21 | 恒玄科技（上海）有限公司 | The high-efficient noise-reducing earphone and noise reduction system of low-power consumption |
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| CN211406245U (en) * | 2020-03-17 | 2020-09-01 | 广州由我科技股份有限公司 | Earphone of single microphone |
| CN112399301B (en) * | 2020-11-18 | 2023-03-17 | 维沃移动通信有限公司 | Earphone and noise reduction method |
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