CN109474865B - Wind noise prevention method, earphone and storage medium - Google Patents
Wind noise prevention method, earphone and storage medium Download PDFInfo
- Publication number
- CN109474865B CN109474865B CN201811274916.0A CN201811274916A CN109474865B CN 109474865 B CN109474865 B CN 109474865B CN 201811274916 A CN201811274916 A CN 201811274916A CN 109474865 B CN109474865 B CN 109474865B
- Authority
- CN
- China
- Prior art keywords
- noise signal
- noise
- wind
- feedforward
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Headphones And Earphones (AREA)
Abstract
The embodiment of the application provides a wind noise prevention method, an earphone and a storage medium, wherein the method comprises the following steps: acquiring a first noise signal and a second noise signal which are respectively acquired by a feedforward microphone and a reference microphone of the earphone, wherein the windward surface of the reference microphone is covered with a wind-proof layer; determining a wind noise signal contained in the first noise signal according to a difference between the first noise signal and the second noise signal; and stopping the feedforward noise reduction processing of the useful signal output by the loudspeaker in the earphone when the wind noise signal does not meet the feedforward noise reduction condition. In this embodiment, the wind noise signal included in the first noise signal may be determined, and when the wind noise signal does not satisfy the feedforward noise reduction condition, the feedforward noise reduction function of the headphone may be stopped, so as to avoid an influence of the wind noise signal on the feedforward noise reduction function of the headphone, thereby improving the hearing experience of the user.
Description
Technical Field
The application relates to the technical field of noise reduction, in particular to a wind noise prevention method, an earphone and a storage medium.
Background
The basic principle of feedforward noise reduction is that a feedforward microphone arranged outside an earphone collects an environmental noise signal, the environmental noise is subjected to phase reversal processing through a noise reduction filter, and a noise reduction signal with the same phase as the environmental noise signal is played through a loudspeaker inside the earphone so as to counteract the environmental noise signal.
Since the feedforward microphone is directly exposed to the external environment, it is susceptible to interference from the external environment, especially wind noise. This results in the feedforward noise reduction process being greatly affected by wind noise, resulting in poor noise reduction.
Disclosure of Invention
Aspects of the present application provide a wind noise prevention method, an earphone, and a storage medium to improve an influence of wind noise on a feedforward noise reduction process.
The embodiment of the application provides a wind noise prevention method, which is suitable for an earphone, and comprises the following steps:
acquiring a first noise signal and a second noise signal which are respectively acquired by a feedforward microphone and a reference microphone of the earphone, wherein the windward surface of the reference microphone is covered with a wind-proof layer;
determining a wind noise signal contained in the first noise signal according to a difference between the first noise signal and the second noise signal;
and stopping the feedforward noise reduction processing of the useful signal output by the loudspeaker in the earphone when the wind noise signal does not meet the feedforward noise reduction condition.
The embodiment of the application also provides an earphone which comprises a shell, a feedforward microphone, a reference microphone, a control circuit and a loudspeaker;
the feedforward microphone and the reference microphone are arranged on the shell, and the windward surface of the reference microphone is covered with a windproof layer;
the feedforward microphone is used for sending a collected first noise signal to the control circuit, and the reference microphone is used for sending a collected second noise signal to the control circuit;
the control circuit is used for acquiring the first noise signal and the second noise signal; determining a wind noise signal contained in the first noise signal according to a difference between the first noise signal and the second noise signal; and stopping the feedforward noise reduction processing of the useful signal output by the loudspeaker when the wind noise signal does not meet the feedforward noise reduction condition.
Embodiments of the present application also provide a computer-readable storage medium storing computer instructions, which, when executed by one or more processors, cause the one or more processors to perform the wind noise prevention method performed by the aforementioned headset.
In the embodiment of the application, the feedforward microphone and the reference microphone of the earphone are placed in the same noise environment, and the windward side of the reference microphone is covered with a windproof layer; according to the difference between the first noise signal and the second noise signal respectively collected by the feedforward microphone and the reference microphone, the wind noise signal contained in the first noise signal can be determined, and when the wind noise signal does not meet the feedforward noise reduction condition, the feedforward noise reduction function of the earphone can be stopped, so that the influence of the wind noise signal on the feedforward noise reduction function of the earphone is avoided, and the hearing experience of a user is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1a is a schematic structural diagram of an earphone according to an embodiment of the present application;
fig. 1b is a schematic structural diagram of another earphone according to an embodiment of the present application
FIG. 2 is a schematic diagram of an assembly structure of a feedforward microphone and a reference microphone according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a wind noise prevention method according to another embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, the feedforward microphone is directly exposed to the external environment, so that the feedforward microphone is easily interfered by the external environment, especially wind noise. This results in the feedforward noise reduction process being greatly affected by wind noise, resulting in poor noise reduction. To solve the technical problem, the embodiment of the present application provides a solution, and the main principle is as follows: the feedforward microphone and the reference microphone of the earphone are placed in the same noise environment, and the windward side of the reference microphone is covered with a wind-proof layer; according to the difference between the first noise signal and the second noise signal respectively collected by the feedforward microphone and the reference microphone, the wind noise signal contained in the first noise signal can be determined, and when the wind noise signal does not meet the feedforward noise reduction condition, the feedforward noise reduction function of the earphone can be stopped, so that the influence of the wind noise signal on the feedforward noise reduction function of the earphone is avoided, and the hearing experience of a user is improved.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1a is a schematic structural diagram of an earphone according to an embodiment of the present application. As shown in fig. 1a, the headset comprises: a housing 00, a feedforward microphone 10, a reference microphone 20, a control circuit 30 and a loudspeaker 40.
The earphone may be a headphone, a neckband earphone, or an in-ear earphone, which is not limited in this embodiment. The shape of the shell 00 can be flexibly adjusted for different types of earphones, for example, the shell 00 corresponding to a headphone can be in the shape of an earmuff, and the shell 00 corresponding to an in-ear earphone can be in the shape of an earplug.
The inventor finds in research that, because the feedforward microphone is usually exposed to the external environment, when wind noise exists in the external environment, the environmental noise signal collected by the feedforward microphone at least includes a wind noise signal and a general noise signal. The normal noise signal is a noise signal transmitted to the earphone through a medium such as air, and the wind noise signal is a turbulent noise signal generated by collision of flowing air against a sound hole of the earphone. Based on the feedforward noise reduction principle, the environmental noise collected by the feedforward microphone is subjected to phase inversion processing by the earphone through the feedforward noise reduction filter, and a feedforward noise reduction signal with equivalent phase inversion to the environmental noise signal is played through a loudspeaker in the earphone so as to offset the environmental noise signal. However, since the wind noise signal is mainly concentrated in the low frequency band, most of the wind noise signal can be blocked by the housing of the earphone, so that the normal noise signal will enter the housing, but the wind noise signal does not enter the housing, from the environmental noise signal collected by the feedforward microphone. This causes the feedforward noise reduction filter to produce a feedforward noise reduction signal in which the portion of the feedforward noise reduction signal corresponding to the wind noise signal is not cancelled. The part of the feed-forward noise reduction signal that cannot be cancelled forms a new noise signal instead, which undoubtedly greatly reduces the user's hearing experience.
In the present embodiment, the feedforward microphone 10 and the reference microphone 20 are disposed on the housing 00, and the feedforward microphone 10 and the reference microphone 20 are in the same noise environment. In order to make the wind noise effects felt by the feedforward microphone 10 and the reference microphone 20 consistent, the reference microphone 20 and the windward side of the feedforward microphone 10 may optionally be arranged to be coplanar, which may ensure that the wind directions felt by the feedforward microphone 10 and the reference microphone 20 are consistent. Further, the distance between the reference microphone 20 and the feedforward microphone 10 can be set to be less than a predetermined value, and in some practical applications, the reference microphone 20 and the feedforward microphone 10 can be installed adjacently, so that the reference microphone 20 and the feedforward microphone 10 are close enough, which further ensures that the wind speeds sensed by the reference microphone 20 and the feedforward microphone 10 are consistent. Of course, since the surface area of the housing 00 of the earphone is not large, the difference of the wind speed sensed by the reference microphone 20 and the feedforward microphone 10 when there is a distance therebetween is also negligible, and this embodiment does not limit this.
In the present embodiment, the windward side of the reference microphone 20 is covered with the wind-proof layer 60. Fig. 2 is a schematic view showing an assembly structure of the feedforward microphone 10 and the reference microphone 20, and as shown in fig. 2, the feedforward microphone 10 and the reference microphone 20 may be assembled in a sound hole of the casing 00, and the wind-proof layer 60 may be sealed in the sound hole where the reference microphone 20 is located, so that the wind-proof layer 60 covers the windward side of the reference microphone 20. It should be noted that the assembling structure of the feedforward microphone 10 and the reference microphone 20 shown in fig. 2 is only an example, which should not limit the scope of the present application, and the assembling structure of the feedforward microphone 10 and the reference microphone 20 may be other types, which is not limited by the present embodiment. In addition, only one feedforward microphone 10 and one reference microphone 20 are shown in fig. 2, but the number of feedforward microphones 10 and reference microphones 20 is not limited in the present embodiment.
The wind-proof layer 60 is effective in suppressing wind noise signals, and at the same time, the wind-proof layer 60 may also suppress general noise signals. This makes the signals picked up by the feedforward microphone 10 and the reference microphone 20 different for the same noise environment. The windproof layer 60 may be made of windproof material such as windproof foam, which is not limited in this embodiment.
In this embodiment, the signal collected by the feedforward microphone 10 is referred to as a first noise signal, and the signal collected by the reference microphone 20 is referred to as a second noise signal. The feedforward microphone 10 and the reference microphone 20 may send the first noise signal and the second noise signal, respectively, to the control circuit 30.
The control circuit 30 may determine a wind noise signal included in the first noise signal according to a difference between the acquired first noise signal and the acquired second noise signal. When wind noise exists in a noise environment outside the earphone, the first noise signal collected by the feedforward microphone 10 includes a wind noise signal; since the wind-proof layer 60 has a suppressing effect on the wind noise signal, the second noise signal collected by the reference microphone 20 will be different from the first noise signal collected by the feedforward microphone 10. In this embodiment, the wind noise signal may be determined based on a difference between the first noise signal and the second noise signal.
When the wind noise signal does not satisfy the feedforward noise reduction condition, the control circuit 30 may stop the feedforward noise reduction processing of the useful signal output by the speaker 40, that is, stop the feedforward noise reduction function of the headphone. Alternatively, the feedforward microphone 10 and the reference microphone 20 may continuously collect signals, and the control circuit 30 may restart the feedforward noise reduction function of the headphone when the wind noise signal included in the first noise signal satisfies the feedforward noise reduction condition. That is, when the wind noise in the noisy environment becomes sufficiently small or disappears, the headphone can restart the feedforward noise reduction function, whereby the headphone can adaptively adjust the feedforward noise reduction function to obtain a better noise reduction effect.
Fig. 1b is a schematic structural diagram of another earphone provided in an embodiment of the present application. As shown in fig. 1b, the headphone further comprises a feedforward noise reduction filter 50, the feedforward noise reduction filter 50 is connected to the control circuit, and the control circuit 30 can control the feedforward noise reduction filter 50 to generate the feedforward noise reduction signal according to the first noise signal collected by the feedforward microphone 10.
In this embodiment, the control circuit 30 may control the feedforward noise reduction filter 50 of the headphone to stop generating the feedforward noise reduction signal when the wind noise signal does not satisfy the feedforward noise reduction condition, so as to stop performing the feedforward noise reduction processing on the useful signal output by the speaker 40 in the headphone. Of course, the control circuit 30 may also stop the feedforward noise reduction function of the earphone in other manners, for example, control the speaker 40 of the earphone to stop outputting the feedforward noise reduction signal, and the like, which is not limited in this embodiment.
In the present embodiment, the feedforward microphone 10 and the reference microphone 20 of the earphone are placed in the same noise environment, and the windward side of the reference microphone 20 is covered with the wind-proof layer 60; according to the difference between the first noise signal and the second noise signal respectively collected by the feedforward microphone 10 and the reference microphone 20, the wind noise signal contained in the first noise signal can be determined, and when the wind noise signal does not meet the feedforward noise reduction condition, the feedforward noise reduction function of the earphone can be stopped to avoid the influence of the wind noise signal on the feedforward noise reduction function of the earphone, so as to improve the hearing experience of the user.
In the above or below embodiments, the control circuit 30 may perform fourier transform on the first noise signal and the second noise signal, respectively, to obtain the frequency spectrum of the first noise signal and the frequency spectrum of the second noise signal; calculating the difference between the frequency spectrum of the first noise signal and the frequency spectrum of the second noise signal as the total noise suppression amount corresponding to the wind-proof layer 60; the normal noise suppression amount corresponding to the wind-proof layer 60 is subtracted from the total noise suppression amount corresponding to the wind-proof layer 60 to obtain the frequency spectrum of the wind noise signal.
As described above, the wind shielding layer 60 has a suppression effect on both the wind noise signal and the general noise signal, and therefore, in the present embodiment, the difference between the frequency spectrum of the first noise signal and the frequency spectrum of the second noise signal can be used as the total amount of noise suppression corresponding to the wind shielding layer 60. The total noise suppression amount will include the amount of wind noise suppression and the amount of ordinary noise suppression corresponding to the wind-proof layer 60. The inventor finds in research that the wind-proof layer 60 has a relatively weak and stable suppression effect on the common noise signal, so that the common noise suppression amount corresponding to the wind-proof layer 60 can be taken as a known amount in the calculation process, and the common noise suppression amount is an invariant for the same wind-proof layer 60. The amount of general noise suppression can be predetermined, and the specific process will be described in detail later.
Accordingly, the control circuit 30 can subtract the normal noise suppression amount corresponding to the wind-proof layer 60 from the total noise suppression amount, and the obtained difference is the wind noise suppression amount corresponding to the wind-proof layer 60. The control circuit 30 may use the amount of wind noise suppression corresponding to the wind-proof layer 60 as the frequency spectrum of the wind noise signal. To this end, the control circuit 30 may determine a wind noise signal included in the first noise signal collected by the feedforward microphone 10.
In this embodiment, the normal noise suppression amount corresponding to the wind-proof layer 60 may be determined in advance. Specifically, the control circuit 30 may obtain a first test noise signal and a second test noise signal respectively collected by the feedforward microphone 10 and the reference microphone 20 in a windless experimental environment; performing Fourier transform on the first test noise signal and the second test noise signal respectively to obtain a frequency spectrum of the first test noise signal and a frequency spectrum of the second test noise signal; the difference between the frequency spectrum of the first test noise signal and the frequency spectrum of the second test noise signal is calculated as the amount of ordinary noise suppression corresponding to the wind-proof layer 60.
Under windless experimental conditions, ordinary noise can be played as a test sound source, whereby the feedforward microphone 10 and the reference microphone 20 will be placed in the same noise environment, and no wind noise is present in this noise environment. Since the wind-proof layer 60 has a suppressing effect on the normal noise signal, the difference between the first test noise signal collected by the feedforward microphone 10 and the second test noise signal collected by the reference microphone 20 may represent the suppression of the normal noise signal by the wind-proof layer 60.
In this embodiment, the frequency spectrums of the first test noise signal and the second test noise signal are obtained by performing fourier transform on the first test noise signal and the second test noise signal, and the difference between the frequency spectrums of the first test noise signal and the second test noise signal is used as the common noise suppression amount corresponding to the wind-proof layer 60. Accordingly, the normal noise suppression amount corresponding to the wind-proof layer 60 can be determined in advance. For the earphone, under the condition that the structure of the windproof layer 60 is unchanged, the common noise suppression amount corresponding to the windproof layer 60 is invariable.
In the above or below described embodiments, the control circuit 30 may calculate a similarity between the frequency spectrum of the wind noise signal and the frequency spectrum of the standard wind noise signal; and when the similarity is larger than a preset threshold value, stopping performing feedforward noise reduction processing on the useful signal output by the loudspeaker 40 in the earphone. The preset threshold may be determined according to actual needs, for example, the preset threshold may be set to 0.7. Of course, the preset threshold may also be other values, for example, 0.8, 0.6, etc., which is not limited in this embodiment.
The inventor finds in research that the wind noise signal is mainly concentrated in a low frequency band and has a specific spectral shape, from which the spectrum of the standard wind noise signal can be determined. In this embodiment, the frequency spectrum of the wind noise signal determined by the control circuit 30 may be compared with the frequency spectrum of the standard wind noise signal, so as to determine whether the wind noise signal determined by the control circuit 30 through calculation meets the characteristics of the wind noise signal. In some practical applications, the formula can be used
Calculating a similarity between a spectrum of the wind noise signal and a spectrum of a standard wind noise signal, wherein W represents the spectrum of the standard wind noise signal, Δ P2 represents the spectrum of the wind noise signal contained in the first noise signal, Cov is a covariance function, and D is a variance function.
If the similarity between the wind noise signal determined by the control circuit 30 through calculation and the standard wind noise signal meets the preset requirement, it can be determined that the wind noise signal does exist in the first noise signal collected by the feedforward microphone 10; if the similarity between the wind noise signal determined by the control circuit 30 through calculation and the standard wind noise signal does not meet the preset requirement, it may be determined that the wind noise signal may not exist in the first noise signal collected by the feedforward microphone 10. In this embodiment, based on the frequency spectrum of the standard wind noise signal, the control circuit 30 can more accurately determine whether the first noise signal collected by the feedforward microphone 10 includes the wind noise signal, so as to avoid the erroneous determination.
When it is determined that the wind noise signal does exist in the first noise signal collected by the feedforward microphone 10, the control circuit 30 may stop the feedforward noise reduction function of the earphone; when it is determined that the wind noise signal does not exist in the first noise signal collected by the feedforward microphone 10, the control circuit 30 may turn on the feedforward noise reduction function of the earphone.
It is considered that a small amount of wind noise signals does not have a great influence on the feedforward noise reduction function of the headphone, and if the feedforward noise reduction function of the headphone is stopped, the noise reduction capability of the headphone is impaired. Therefore, in the present embodiment, the control circuit 30 may calculate the total energy value of the wind noise signal when determining that the wind noise signal does exist in the first noise signal collected by the feedforward microphone 10; and when the total energy value is larger than the preset energy threshold value, stopping performing the feedforward noise reduction processing on the useful signal output by the loudspeaker 40 in the earphone. The preset energy threshold may be determined according to actual needs, for example, the preset energy threshold may be set to 5 dB. Of course, the preset energy threshold may also be other values, such as 8dB, 6dB, etc., which is not limited in this embodiment.
In this embodiment, the total energy value of the wind noise signal may represent the degree of influence that the wind noise signal will have on the feedforward noise reduction process, as described above, the portion of the feedforward noise reduction signal corresponding to the wind noise signal cannot be cancelled and becomes a new noise signal, and therefore, the larger the total energy value of the wind noise signal is, the larger the total energy value of the feedforward noise reduction signal that cannot be cancelled is, and the larger the influence on the auditory experience is. In the embodiment, when the total energy value of the wind noise signal is smaller, the feedforward noise reduction function of the earphone is kept, so that the noise reduction effect of the earphone is ensured; and when the total energy value of the wind noise signal is large, stopping the feedforward noise reduction function of the earphone so as to avoid the wind noise signal from influencing the hearing experience of the earphone.
Fig. 3 is a schematic flow chart of a wind noise prevention method according to another embodiment of the present disclosure. The method is applicable to a headset, and as shown in fig. 3, the method comprises:
300. acquiring a first noise signal and a second noise signal which are respectively acquired by a feedforward microphone and a reference microphone of an earphone, wherein the windward side of the reference microphone is covered with a wind-proof layer;
301. determining a wind noise signal contained in the first noise signal according to a difference between the first noise signal and the second noise signal;
302. and stopping the feedforward noise reduction processing of the useful signal output by the loudspeaker in the earphone when the wind noise signal does not meet the feedforward noise reduction condition.
In the embodiment, the feedforward microphone and the reference microphone of the earphone are placed in the same noise environment, and the windward side of the reference microphone is covered with the windproof layer; according to the difference between the first noise signal and the second noise signal respectively collected by the feedforward microphone and the reference microphone, the wind noise signal contained in the first noise signal can be determined, and when the wind noise signal does not meet the feedforward noise reduction condition, the feedforward noise reduction function of the earphone can be stopped, so that the influence of the wind noise signal on the feedforward noise reduction function of the earphone is avoided, and the hearing experience of a user is improved.
In an alternative embodiment, step 301 comprises:
fourier transform is carried out on the first noise signal and the second noise signal respectively to obtain a frequency spectrum of the first noise signal and a frequency spectrum of the second noise signal;
calculating the difference value between the frequency spectrum of the first noise signal and the frequency spectrum of the second noise signal as the total noise suppression amount corresponding to the windproof layer;
and subtracting the common noise suppression amount corresponding to the wind-proof layer from the noise suppression total amount corresponding to the wind-proof layer to obtain the frequency spectrum of the wind noise signal.
In an optional embodiment, before the step of subtracting the common noise suppression amount corresponding to the wind shield layer from the total noise suppression amount corresponding to the wind shield layer, the method further includes:
in a windless experiment environment, acquiring a first test noise signal and a second test noise signal which are respectively acquired by a feedforward microphone and a reference microphone;
performing Fourier transform on the first test noise signal and the second test noise signal respectively to obtain a frequency spectrum of the first test noise signal and a frequency spectrum of the second test noise signal;
and calculating the difference between the frequency spectrum of the first test noise signal and the frequency spectrum of the second test noise signal as the common noise suppression amount corresponding to the windproof layer.
In an alternative embodiment, step 302 includes:
calculating the similarity between the frequency spectrum of the wind noise signal and the frequency spectrum of the standard wind noise signal;
and when the similarity is larger than a preset threshold value, stopping performing feedforward noise reduction processing on the useful signal output by the loudspeaker in the earphone.
In an alternative embodiment, the step of stopping the feedforward noise reduction processing on the useful signal output by the speaker in the earphone when the similarity is greater than the preset similarity threshold includes:
when the similarity is larger than a preset threshold value, calculating the total energy value of the wind noise signal;
and when the total energy value is larger than a preset energy threshold value, stopping performing feedforward noise reduction processing on the useful signal output by the loudspeaker in the earphone.
In an alternative embodiment, the step of stopping the feed-forward noise reduction processing of the desired signal output by the speaker in the headset comprises:
the feedforward noise reduction filter of the headset is controlled to stop generating the feedforward noise reduction signal.
Accordingly, the present invention also provides a computer readable storage medium storing a computer program, which when executed can implement the above steps performed by the headset.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A wind noise prevention method applicable to earphones, the method comprising:
acquiring a first noise signal acquired by a feedforward microphone of the earphone and a second noise signal acquired by a reference microphone, wherein the windward surface of the reference microphone is covered with a windproof layer;
determining a wind noise signal contained in the first noise signal according to a difference between the first noise signal and the second noise signal;
when the similarity between the wind noise signal and a standard wind noise signal does not meet a preset requirement, stopping carrying out feedforward noise reduction processing on a useful signal output by a loudspeaker in the earphone;
wherein, the similarity of the wind noise signal and the standard wind noise signal is calculated by a formula, and the formula is as follows:
w denotes a spectrum of a standard wind noise signal, Δ P2 denotes a spectrum of a wind noise signal contained in the first noise signal, Cov is a covariance function, D is a variance function;
wherein the determining a wind noise signal contained in the first noise signal according to a difference of the first noise signal and the second noise signal comprises:
performing fourier transform on the first noise signal and the second noise signal, respectively, to obtain a spectrum of the first noise signal and a spectrum of the second noise signal;
calculating a difference value between the frequency spectrum of the first noise signal and the frequency spectrum of the second noise signal as a total noise suppression amount corresponding to the windproof layer;
in a windless experimental environment, acquiring a first test noise signal acquired by the feedforward microphone and a second test noise signal acquired by the reference microphone;
performing fourier transform on the first test noise signal and the second test noise signal, respectively, to obtain a frequency spectrum of the first test noise signal and a frequency spectrum of the second test noise signal;
calculating a difference value between the frequency spectrum of the first test noise signal and the frequency spectrum of the second test noise signal to be used as a common noise suppression amount corresponding to the windproof layer;
and subtracting the common noise suppression amount corresponding to the windproof layer from the noise suppression total amount corresponding to the windproof layer to obtain the frequency spectrum of the wind noise signal.
2. The method of claim 1, wherein stopping the feedforward noise reduction processing of the useful signal output by the speaker in the earphone when the similarity between the wind noise signal and the standard wind noise signal does not meet a preset requirement comprises:
calculating the similarity between the frequency spectrum of the wind noise signal and the frequency spectrum of a standard wind noise signal;
and when the similarity is larger than a preset threshold value, stopping performing feedforward noise reduction processing on the useful signal output by the loudspeaker in the earphone.
3. The method of claim 2, wherein stopping the feedforward noise reduction processing of the useful signal output by the speaker in the headset when the similarity is greater than a preset threshold comprises:
when the similarity is larger than a preset threshold value, calculating the total energy value of the wind noise signal;
and when the total energy value is larger than a preset energy threshold value, stopping performing feedforward noise reduction processing on the useful signal output by the loudspeaker in the earphone.
4. The method of any of claims 1-3, wherein stopping feed-forward noise reduction processing of the desired signal output by the speaker in the headset comprises:
controlling a feedforward noise reduction filter of the headset to stop generating a feedforward noise reduction signal.
5. An earphone comprising a housing, a feedforward microphone, a reference microphone, a control circuit and a speaker;
the feedforward microphone and the reference microphone are arranged on the shell, and the windward surface of the reference microphone is covered with a windproof layer;
the feedforward microphone is used for sending a collected first noise signal to the control circuit, and the reference microphone is used for sending a collected second noise signal to the control circuit;
the control circuit is used for acquiring the first noise signal and the second noise signal; determining a wind noise signal contained in the first noise signal according to a difference between the first noise signal and the second noise signal; when the similarity between the wind noise signal and a standard wind noise signal does not meet a preset requirement, stopping performing feedforward noise reduction processing on a useful signal output by the loudspeaker;
wherein, the similarity of the wind noise signal and the standard wind noise signal is calculated by a formula, and the formula is as follows:
w denotes a spectrum of a standard wind noise signal, Δ P2 denotes a spectrum of a wind noise signal contained in the first noise signal, Cov is a covariance function, D is a variance function;
wherein the control circuit, when determining a wind noise signal contained in the first noise signal from a difference of the first noise signal and the second noise signal, is configured to:
performing fourier transform on the first noise signal and the second noise signal, respectively, to obtain a spectrum of the first noise signal and a spectrum of the second noise signal;
calculating a difference value between the frequency spectrum of the first noise signal and the frequency spectrum of the second noise signal as a total noise suppression amount corresponding to the windproof layer;
in a windless experimental environment, acquiring a first test noise signal acquired by the feedforward microphone and a second test noise signal acquired by the reference microphone;
performing fourier transform on the first test noise signal and the second test noise signal, respectively, to obtain a frequency spectrum of the first test noise signal and a frequency spectrum of the second test noise signal;
calculating a difference value between the frequency spectrum of the first test noise signal and the frequency spectrum of the second test noise signal to be used as a common noise suppression amount corresponding to the windproof layer;
and subtracting the common noise suppression amount corresponding to the windproof layer from the noise suppression total amount corresponding to the windproof layer to obtain the frequency spectrum of the wind noise signal.
6. The headset of claim 5, wherein the control circuit is specifically configured to:
calculating the similarity between the frequency spectrum of the wind noise signal and the frequency spectrum of a standard wind noise signal;
and when the similarity is larger than a preset threshold value, stopping performing feedforward noise reduction processing on the useful signal output by the loudspeaker in the earphone.
7. The headset of claim 6, wherein the control circuit is specifically configured to:
when the similarity is larger than a preset threshold value, calculating the total energy value of the wind noise signal;
and when the total energy value is larger than a preset energy threshold value, stopping performing feedforward noise reduction processing on the useful signal output by the loudspeaker in the earphone.
8. The earphone according to any one of claims 5 to 7, wherein the windproof layer is made of windproof foam.
9. A computer-readable storage medium storing computer instructions, which when executed by one or more processors, cause the one or more processors to perform the method of wind noise protection of any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811274916.0A CN109474865B (en) | 2018-10-30 | 2018-10-30 | Wind noise prevention method, earphone and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811274916.0A CN109474865B (en) | 2018-10-30 | 2018-10-30 | Wind noise prevention method, earphone and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109474865A CN109474865A (en) | 2019-03-15 |
| CN109474865B true CN109474865B (en) | 2021-03-09 |
Family
ID=65666386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811274916.0A Active CN109474865B (en) | 2018-10-30 | 2018-10-30 | Wind noise prevention method, earphone and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109474865B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992921B (en) * | 2019-10-31 | 2023-12-12 | 佳禾智能科技股份有限公司 | Method for dynamically selecting reference microphone in feedforward noise reduction system, electronic device and computer readable storage medium |
| CN111405406B (en) * | 2020-03-27 | 2021-12-24 | 歌尔股份有限公司 | Noise reduction method and device for hybrid noise reduction earphone, wireless earphone and storage medium |
| CN111741401B (en) * | 2020-08-26 | 2021-01-01 | 恒玄科技(北京)有限公司 | Wireless communication method for wireless headset assembly and wireless headset assembly |
| CN111935584A (en) * | 2020-08-26 | 2020-11-13 | 恒玄科技(上海)股份有限公司 | Wind noise processing method and device for wireless earphone assembly and earphone |
| CN112822593B (en) * | 2021-01-04 | 2023-03-31 | 泰凌微电子(上海)股份有限公司 | Adaptive noise reduction control method, adaptive noise reduction control device and earphone |
| CN114071309B (en) * | 2021-12-20 | 2023-08-25 | 歌尔科技有限公司 | Earphone noise reduction method, device, equipment and computer readable storage medium |
| CN115278438B (en) * | 2022-07-27 | 2024-08-27 | 北京爱德发科技有限公司 | Noise reduction earphone, noise reduction method and device, storage medium and processor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602163A (en) * | 2014-12-31 | 2015-05-06 | 歌尔声学股份有限公司 | Active noise reduction earphone, and noise reduction control method and system used on active noise reduction earphone |
| CN107039029A (en) * | 2015-12-16 | 2017-08-11 | 哈曼贝克自动系统股份有限公司 | There is the audio reproduction of Active noise control in the helmet |
| CN107517415A (en) * | 2016-06-16 | 2017-12-26 | 峰范（北京）科技有限公司 | Intelligent earphone |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8223986B2 (en) * | 2009-11-19 | 2012-07-17 | Apple Inc. | Electronic device and external equipment with digital noise cancellation and digital audio path |
| US9905216B2 (en) * | 2015-03-13 | 2018-02-27 | Bose Corporation | Voice sensing using multiple microphones |
-
2018
- 2018-10-30 CN CN201811274916.0A patent/CN109474865B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602163A (en) * | 2014-12-31 | 2015-05-06 | 歌尔声学股份有限公司 | Active noise reduction earphone, and noise reduction control method and system used on active noise reduction earphone |
| CN107039029A (en) * | 2015-12-16 | 2017-08-11 | 哈曼贝克自动系统股份有限公司 | There is the audio reproduction of Active noise control in the helmet |
| CN107517415A (en) * | 2016-06-16 | 2017-12-26 | 峰范（北京）科技有限公司 | Intelligent earphone |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109474865A (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109474865B (en) | Wind noise prevention method, earphone and storage medium | |
| CN109348322B (en) | Wind noise prevention method, feedforward noise reduction system, earphone and storage medium | |
| US20200389717A1 (en) | Headset on ear state detection | |
| CN109688498B (en) | Volume adjusting method, earphone and storage medium | |
| US11553286B2 (en) | Wearable hearing assist device with artifact remediation | |
| CN109257675B (en) | Wind noise prevention method, earphone and storage medium | |
| US9247337B2 (en) | Headphone and headset | |
| US20180225082A1 (en) | User Voice Activity Detection Methods, Devices, Assemblies, and Components | |
| US11134348B2 (en) | Method of operating a hearing aid system and a hearing aid system | |
| US11438711B2 (en) | Hearing assist device employing dynamic processing of voice signals | |
| US12014718B2 (en) | Feedback noise reduction method and system, and earphone | |
| EP2830324B1 (en) | Headphone and headset | |
| US11651759B2 (en) | Gain adjustment in ANR system with multiple feedforward microphones | |
| CN115278438B (en) | Noise reduction earphone, noise reduction method and device, storage medium and processor | |
| CN113507662B (en) | Noise reduction processing method, apparatus, device, storage medium, and program | |
| EP4021011B1 (en) | Method and apparatus for recognizing wind noise of earphone, and earphone | |
| CN113132880B (en) | Impact noise suppression method and system based on dual-microphone architecture | |
| CN112584266A (en) | Signal processing method and device and earphone | |
| CN113994423A (en) | Audio system and signal processing method for voice activity detection of ear-worn playing device | |
| US20230178063A1 (en) | Audio device having aware mode auto-leveler | |
| US20240055011A1 (en) | Dynamic voice nullformer | |
| Hayes | Real-time cancellation system offers advantages for controlling feedback | |
| WO2023107426A2 (en) | Audio device having aware mode auto-leveler | |
| CN118072709A (en) | Howling suppression for Active Noise Cancellation (ANC) systems and methods | |
| KR20240024638A (en) | Electronic apparatus and controlling method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |