CN112954530B - Earphone noise reduction method, device and system and wireless earphone - Google Patents
Earphone noise reduction method, device and system and wireless earphone Download PDFInfo
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- CN112954530B CN112954530B CN202110217606.0A CN202110217606A CN112954530B CN 112954530 B CN112954530 B CN 112954530B CN 202110217606 A CN202110217606 A CN 202110217606A CN 112954530 B CN112954530 B CN 112954530B
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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
Abstract
The invention discloses a method, a device and a system for reducing noise of an earphone and a wireless earphone, wherein the method comprises the following steps: acquiring sound signals collected by a feedback microphone; acquiring a cancellation signal corresponding to the loudspeaker playing signal according to an original audio signal and a dynamic filtering parameter corresponding to the loudspeaker playing signal; the dynamic filtering parameters correspond to an original audio signal and a noise reduction result signal corresponding to the original audio signal; calculating the difference between the sound signal and the counteracting signal to obtain a feedback input signal; according to the feedback input signal, carrying out noise reduction on the loudspeaker playing of the earphone; according to the invention, the original audio signal and the noise reduction result signal are taken as references, and the components of the signal broadcast by the loudspeaker in the sound signal collected by the feedback microphone are offset, so that a purer noise signal is reserved in the feedback input signal, thereby reducing the influence of feedback noise reduction on the low-frequency component in the sound broadcast by the earphone loudspeaker, improving the noise reduction performance of the earphone and improving the user experience.
Description
Technical Field
The invention relates to the technical field of portable listening equipment, in particular to a method, a device and a system for reducing noise of an earphone and a wireless earphone.
Background
With the improvement of living standard and the acceleration of work rhythm of people, the demand of earphones is greatly increased, for example, TWS earphones (real wireless interconnection stereo Bluetooth earphones) are popular with people due to the tone quality and the gorgeous appearance of the TWS earphones. Higher requirements are also provided for the use scene of the earphone, for example, more and more people wear the earphone to listen to songs and work in noisy public places such as stations, docks, airports, supermarkets and the like, so that the sound quality experience of the earphone in these noisy environments presents greater challenges, and an active noise reduction (ANC) earphone is brought forward.
In the prior art, the feedback noise reduction (or called feedback noise reduction) process of the active noise reduction earphone is to directly send the signal collected by the feedback microphone to the feedback filter to generate anti-noise (inverted noise signal), and then feed back the inverted noise signal to the DSP (digital signal processor) to cancel the noise component in the signal heard by human ears; in the actual use process, the existing feedback noise reduction process is found to cause the low-frequency components of the music heard by the user to be lost.
Therefore, how to reduce the feedback and fall the influence of making an uproar to the low frequency component in the sound of earphone loudspeaker broadcast, promote the performance of making an uproar that falls of earphone, promote user experience, be the problem that needs to solve now urgently.
Disclosure of Invention
The invention aims to provide an earphone noise reduction method, an earphone noise reduction device, an earphone noise reduction system and a wireless earphone, so as to reduce the influence of feedback noise reduction on low-frequency components in sound played by an earphone speaker, improve the noise reduction performance of the earphone and improve user experience.
In order to solve the above technical problem, the present invention provides a method for reducing noise of an earphone, including:
acquiring a sound signal collected by a feedback microphone; wherein the sound signal comprises a noise signal and a loudspeaker playing signal;
acquiring a cancellation signal corresponding to the loudspeaker playing signal according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal; wherein the dynamic filtering parameters correspond to the original audio signal and a noise reduction result signal corresponding to the original audio signal;
calculating the difference between the sound signal and the counteracting signal to obtain a feedback input signal;
and according to the feedback input signal, carrying out noise reduction on the loudspeaker play of the earphone.
Optionally, the obtaining a cancellation signal corresponding to the loudspeaker playing signal according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal includes:
and outputting the original audio signal to an adaptive filter corresponding to the dynamic filtering parameters to obtain the cancellation signal output by the adaptive filter.
Optionally, the method further includes:
and adjusting parameters of the self-adaptive filter according to the original audio signal and the noise reduction result signal so as to adjust the dynamic filtering parameters.
Optionally, the reducing noise of the speaker playing of the earphone according to the feedback input signal includes:
outputting the feedback input signal to a feedback filter to obtain a feedback output signal output by the feedback filter;
outputting an external environment signal acquired by a feedforward microphone to a feedforward filter to obtain a feedforward output signal output by the feedforward filter;
and reducing noise of the loudspeaker playing of the earphone by using the feedback output signal and the feedforward output signal.
Optionally, the method further includes:
and adjusting the feedforward noise reduction parameter of the feedforward filter according to the external environment signal and the feedback output signal.
The invention also provides a noise reduction device for the earphone, which comprises:
the acquisition module is used for acquiring sound signals acquired by the feedback microphone; wherein the sound signal comprises a noise signal and a loudspeaker playing signal;
the offset acquisition module is used for acquiring an offset signal corresponding to the loudspeaker playing signal according to the original audio signal corresponding to the loudspeaker playing signal and the dynamic filtering parameter; wherein the dynamic filtering parameters correspond to the original audio signal and a noise reduction result signal corresponding to the original audio signal;
the calculating module is used for calculating the difference between the sound signal and the counteracting signal to obtain a feedback input signal;
and the noise reduction module is used for reducing noise of the loudspeaker play of the earphone according to the feedback input signal.
The invention also provides a noise reduction system for an earphone, comprising:
the feedback microphone is used for collecting sound signals; wherein the sound signal comprises a noise signal and a loudspeaker playing signal;
the adaptive filter is used for acquiring a cancellation signal corresponding to the loudspeaker playing signal according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal; wherein the dynamic filtering parameters correspond to the original audio signal and a noise reduction result signal corresponding to the original audio signal;
the first adder is connected with the feedback microphone and the cancellation filter and used for calculating the difference between the sound signal and the cancellation signal to obtain a feedback input signal;
and the feedback filter is connected with the first adder and is used for acquiring a feedback output signal according to the feedback input signal so as to reduce the noise of the loudspeaker playing of the earphone by using the feedback input signal.
Optionally, the system further comprises:
and the digital signal processor is used for adjusting the parameters of the self-adaptive filter according to the original audio signal and the noise reduction result signal so as to adjust the dynamic filtering parameters.
Optionally, the system further comprises:
the feedforward microphone is used for acquiring an external environment signal;
the feedforward filter is connected with the feedforward microphone and used for acquiring a feedforward output signal according to the external environment signal;
the second adder is connected with the feedforward microphone and the feedback microphone and used for acquiring a noise reduction initial signal according to the feedforward output signal, the feedback output signal and the current original audio signal;
and the amplifier is connected with the second adder and used for amplifying the noise reduction initial signal and acquiring a noise reduction result signal played by a loudspeaker of the earphone.
In addition, the present invention also provides a wireless headset, comprising: the device comprises a loudspeaker, a feedback microphone, a memory and a processor; wherein the memory is used for storing a computer program, and the processor is used for implementing the steps of the earphone noise reduction method when executing the computer program.
The invention provides a noise reduction method for an earphone, which comprises the following steps: acquiring a sound signal collected by a feedback microphone; the sound signals comprise noise signals and loudspeaker playing signals; acquiring a cancellation signal corresponding to the loudspeaker playing signal according to the original audio signal corresponding to the loudspeaker playing signal and the dynamic filtering parameter; the dynamic filtering parameters correspond to an original audio signal and a noise reduction result signal corresponding to the original audio signal; calculating the difference between the sound signal and the counteracting signal to obtain a feedback input signal; according to the feedback input signal, carrying out noise reduction on the loudspeaker playing of the earphone;
therefore, according to the invention, the offset signal corresponding to the loudspeaker playing signal is obtained according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal, and the component of the signal broadcast by the loudspeaker in the sound signal collected by the feedback microphone is offset by taking the original audio signal and the noise reduction result signal as reference, so that a purer noise signal is reserved in the feedback input signal, thereby reducing the influence of feedback noise reduction on the low-frequency component in the sound broadcast by the loudspeaker of the earphone, improving the noise reduction performance of the earphone, and improving the user experience. In addition, the invention also provides an earphone noise reduction device, an earphone noise reduction system and a wireless earphone, and the earphone noise reduction device, the earphone noise reduction system and the wireless earphone also have the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a noise reduction method for an earphone according to an embodiment of the present invention;
fig. 2 is a schematic view of an earphone structure of another earphone noise reduction method according to an embodiment of the present invention;
fig. 3 is a signal flow diagram illustrating another noise reduction method for a headphone according to an embodiment of the present invention;
fig. 4 is a block diagram of a structure of a noise reduction apparatus for an earphone according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Referring to fig. 1, fig. 1 is a flowchart of a noise reduction method for an earphone according to an embodiment of the present invention. The method can comprise the following steps:
step 101: acquiring a sound signal collected by a feedback microphone; the sound signal comprises a noise signal and a loudspeaker playing signal.
Specifically, the feedback microphone in this embodiment may be a microphone provided in the earphone and used for collecting noise signals leaked into the ear of the user wearing the earphone. The present embodiment does not limit the specific setting position of the Feedback microphone in the earphone, and may be implemented in the same or similar manner as the setting position of the Feedback microphone in the existing Feedback (or Feedback, FB) type noise reduction earphone or Feed-Forward (FF) + Feedback mixed noise reduction earphone, as shown in fig. 2, the Feedback microphone (FB Mic) may be arranged near the speaker in the earphone.
It can be understood that the signal collected by the feedback microphone is not only a noise signal; and also the signal played by the earphone speaker (i.e. the speaker playing signal), the sound signal collected by the feedback microphone in this step may include a noise signal and a speaker playing signal.
Specifically, the noise reduction method for the earphone provided by the embodiment can be applied to a feedback noise reduction earphone and can also be applied to a hybrid noise reduction earphone. Correspondingly, when the method is applied to the hybrid noise reduction earphone, the processor (such as a DSP, an active noise reduction chip and the like) in the step can also acquire signals (namely external environment signals) acquired by the feedforward microphone; for example, the processor may obtain the external environment signal and the sound signal acquired by the feedforward microphone and the feedback microphone at the same time.
Correspondingly, the feedforward microphone may be a microphone (such as FF Mic in fig. 2) provided in the earphone in the prior art for collecting external environment noise. The specific arrangement position of the feedforward microphone in the earphone is not limited in this example, for example, the feedforward microphone may be arranged outside the earphone shell so as to collect and pick up an external noise signal, since the installation positions of the feedforward microphone and the feedback microphone in the hybrid noise reduction earphone have a large influence on the noise reduction effect, the arrangement position of the feedforward microphone may enable the feedforward microphone to be as close to the pinna of the user as possible when the user wears the earphone, and the feedforward microphone may be as far away from the feedback microphone as possible in the arrangement position.
Step 102: acquiring a cancellation signal corresponding to the loudspeaker playing signal according to an original audio signal and a dynamic filtering parameter corresponding to the loudspeaker playing signal; wherein the dynamic filtering parameter corresponds to the original audio signal and the noise reduction result signal corresponding to the original audio signal.
It should be noted that the loudspeaker playing signal in the sound signal collected by the feedback microphone may be an audio signal actually received by the feedback microphone and played by the earpiece speaker, that is, a playback (1), which is not exactly the same as an original audio signal (playback) played by the earpiece speaker, and the original audio signal is collected by the feedback microphone through a response of S (z), that is, the playback (1) = playback S (z). S (z) is a secondary variable function (secondary path), and this variable may vary due to many factors, including the wearing manner of the user, the shape of the user' S pinna, etc.; the sound signal collected by the feedback microphone may be playback (1) (speaker playing signal) + noise (noise signal).
Correspondingly, the purpose of this step may be to generate a signal (i.e., a cancellation signal) for canceling the loudspeaker play signal in the sound signal collected by the feedback microphone, for using the dynamic filtering parameter and the original audio signal corresponding to the loudspeaker play signal, so that the loudspeaker play signal in the sound signal may be cancelled by using the cancellation signal close to the loudspeaker play signal, and a relatively pure feedback input signal is obtained to perform subsequent noise reduction processing.
Specifically, in this step, the original audio signal corresponding to the speaker playing signal may be an original audio signal (playback) used when the speaker playing signal collected by the speaker playing feedback microphone of the earphone is played, that is, the original audio signal corresponding to the speaker playing signal is played through the noise reduction result signal after noise reduction before the speaker of the earphone, so that the speaker playing signal is collected by the speaker playing microphone. The dynamic filtering parameter in this step may be a self-adaptive filtering parameter, which may be referred to as SE (Secondary mapping); this step estimates S (z) using SE so that Playback SE (i.e., the cancellation signal) can be close to Playback S (z).
It should be noted that, for the specific manner in which the processor obtains the cancellation signal corresponding to the loudspeaker playing signal according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal in this step, the specific manner may be set by a designer, and the processor may estimate the loudspeaker playing signal through an adaptive algorithm by using the original audio signal to obtain the cancellation signal close to the loudspeaker playing signal, that is, the processor may calculate the cancellation signal according to the original audio signal corresponding to the loudspeaker playing signal and the adaptive algorithm corresponding to the dynamic filtering parameter in this step; the processor can also calculate a cancellation signal close to the loudspeaker playing signal by using the original audio signal corresponding to the loudspeaker playing signal through other algorithms. The processor can also utilize the adaptive filter corresponding to the dynamic filtering parameter to obtain a cancellation signal which is output by the adaptive filter and is close to the loudspeaker playing signal by outputting the original audio signal corresponding to the loudspeaker playing signal to the adaptive filter; as shown in fig. 2, the original Audio signal (playback Audio) corresponding to the speaker playing signal may obtain a cancellation signal of the estimated speaker playing signal (playback (1)) through the adaptive filter (SE). The present embodiment does not set any limit to this.
Specifically, the dynamic filtering parameter in this step may correspond to the original audio signal and the noise reduction result signal corresponding to the original audio signal, that is, the dynamic filtering parameter may be obtained by comparing the difference between the original audio signal and the noise reduction result signal of the original audio signal after noise reduction; correspondingly, the method provided by the embodiment of the invention may further include the step of adjusting, by the processor, the dynamic filtering parameter according to the original audio signal and the noise reduction result signal corresponding to the original audio signal; that is, the processor may adjust the dynamic filtering parameters by comparing the difference between the original audio signal and the noise reduction result signal after the noise reduction of the original audio signal. For example, the processor may adjust the parameters of the adaptive filter by using the original audio signal and the noise reduction result signal corresponding to the original audio signal before outputting the original audio signal corresponding to the speaker playing signal to the adaptive filter corresponding to the dynamic filtering parameters to obtain the cancellation signal corresponding to the speaker playing signal output by the adaptive filter, thereby adjusting the dynamic filtering parameters; as shown in fig. 3, the processor (DSP 1) may configure parameters of the Adaptive filter (Adaptive SE filter) to compare differences between the original audio signal (playback) and the noise reduction result signal, so as to adjust the dynamic filter parameters (SE), so that the cancellation signal (playback SE) is closer to the loudspeaker playback signal (playback (1)) in the sound signal (FB MIC signal) collected by the feedback microphone, and in fig. 3, the original audio signal (playback) is defaulted to be the loudspeaker playback signal (playback (1)) through the noise reduction result signal after noise reduction.
Step 103: and calculating the difference between the sound signal and the cancellation signal to obtain a feedback input signal.
The purpose of this step can be for the treater with the acoustic signal and the offset signal of feedback microphone collection subtract, utilize the estimation to obtain with the loudspeaker broadcast signal in the acoustic signal close offset signal, offset loudspeaker broadcast signal, obtain comparatively pure feedback input signal, loudspeaker broadcast signal in the acoustic signal can be cancelled by totally or most promptly in this step for feedback input signal does not contain loudspeaker broadcast signal or only contains few loudspeaker broadcast signal, reduce the feedback and fall the influence of making an uproar to the low frequency component in the sound of earphone loudspeaker broadcast.
It can be understood that, in this embodiment, the processor in the earphone may directly use the original audio signal and the noise reduction result signal corresponding to the sound signal collected by the feedback microphone as the reference signal, and cancel the speaker playing signal in the sound signal collected by the feedback microphone, that is, the processor directly obtains the sound signal, the original audio signal and the noise reduction result signal, and calculates to obtain the feedback input signal. The earphone may also be provided with an earphone noise reduction system as shown in fig. 3, and a feedback input signal (playback (1) + noise-playback SE) output to the feedback Filter (FB ANC Filter) is calculated by using an adaptive Filter and an adder (or subtractor). The present embodiment does not set any limit to this.
Step 104: and according to the feedback input signal, the loudspeaker playing of the earphone is subjected to noise reduction.
It is understood that the purpose of this step may be to utilize the acoustic signal (i.e. the feedback input signal) for canceling the loudspeaker play signal to perform noise reduction on the loudspeaker play of the earphone, i.e. to utilize the feedback input signal to perform noise reduction on the subsequent original audio signal (e.g. feedback noise reduction and hybrid noise reduction). The specific way of the processor for denoising the loudspeaker playing of the earphone according to the feedback input signal in the step can be set by a designer, if the feedback denoising is adopted, the processor can output the feedback input signal to the feedback filter, and perform the feedback denoising on the loudspeaker playing of the earphone by using the feedback output signal and the original audio signal output by the feedback filter; when the mixed noise reduction is adopted, the feedback input signal can be output to the feedback filter, the external environment signal collected by the feedforward microphone (such as FF Mic in fig. 2) is output to the feedforward filter (such as W1 in fig. 2), and the loudspeaker playing of the earphone is subjected to mixed noise reduction by using the feedback output signal output by the feedback filter, the feedforward output signal output by the feedforward microphone and the original audio signal. This embodiment does not set any limit to this.
That is, in this step, the processor may output the feedback input signal to the feedback filter to obtain a feedback output signal output by the feedback filter; outputting an external environment signal acquired by a feedforward microphone to a feedforward filter to obtain a feedforward output signal output by the feedforward filter; and the loudspeaker playing of the earphone is subjected to noise reduction by utilizing the feedback output signal and the feedforward output signal. As to a specific way of processing the respective input signals by the feedforward filter and the feedback filter in this embodiment, the method may be implemented in a manner the same as or similar to a hybrid noise reduction method in the prior art, as shown in fig. 3, the feedback filter may output a feedback output signal (anti-noise) according to a feedback input signal (playback (1) + noise-playback SE), the feedforward filter (W1) may output a feedforward output signal (noise (1)) according to an external environment signal (noise) collected by the feedforward microphone, and the adder may superimpose the feedforward output signal, the feedback output signal, and the original audio signal that needs noise reduction, and a noise reduction result signal corresponding to the original audio signal that needs noise reduction is obtained after passing through the amplifier (PA), and is output to a speaker of the headphone for playing.
Further, the processor in this embodiment may also adjust the feedforward noise reduction parameter of the feedforward filter according to the external environment signal and the feedback output signal. Because the conventional feedforward filter performs feedforward noise reduction on the external environment signal acquired by the feedforward microphone by using a preset fixed feedforward noise reduction parameter, in this embodiment, the processor dynamically configures the feedforward noise reduction parameter of the feedforward filter by comparing the difference between the external environment signal acquired by the feedforward microphone and the feedback output signal output by the feedback filter, so as to achieve the optimal noise reduction effect. As shown in fig. 3, in this embodiment, the processor (DSP) may configure a parameter of the adjusting feedforward filter (i.e., a feedforward noise reduction parameter) according to a comparison result between the external environment signal (noise) collected by the previous feedforward microphone and the feedback output signal (anti-noise) corresponding to the external environment signal output by the feedback filter, so as to perform feedforward noise reduction on the external environment signal collected by the subsequent feedforward microphone by using the adjusted parameter of the feedforward filter, and obtain a feedforward output signal (noise (1)); the processor (DSP) may also configure and adjust parameters of the feedforward filter according to a comparison result between the external environment signal collected by the current feedforward microphone and the feedback output signal corresponding to the external environment signal output by the feedback filter, so as to perform feedforward noise reduction on the external environment signal collected by the current feedforward microphone by using the adjusted parameters of the feedforward filter, thereby obtaining a feedforward output signal.
In this embodiment, according to the original audio signal and the dynamic filtering parameter corresponding to the speaker playing signal, the cancellation signal corresponding to the speaker playing signal is obtained, and the original audio signal and the noise reduction result signal are used as references to cancel components of a signal played by the speaker in a sound signal collected by the feedback microphone, so that a more pure noise signal is retained in a feedback input signal, and therefore, the influence of feedback noise reduction on low-frequency components in the sound played by the speaker of the earphone is reduced, the noise reduction performance of the earphone is improved, and the user experience is improved.
Referring to fig. 4, fig. 4 is a block diagram of a noise reduction apparatus for an earphone according to an embodiment of the present invention. The apparatus may include:
the acquisition module 10 is used for acquiring sound signals acquired by the feedback microphone; the sound signals comprise noise signals and loudspeaker playing signals;
the offset obtaining module 20 is configured to obtain an offset signal corresponding to the loudspeaker playing signal according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal; the dynamic filtering parameters correspond to an original audio signal and a noise reduction result signal corresponding to the original audio signal;
a calculating module 30, configured to calculate a difference between the sound signal and the cancellation signal to obtain a feedback input signal;
and the noise reduction module 40 is used for reducing noise of the loudspeaker playing of the earphone according to the feedback input signal.
Optionally, the cancellation obtaining module 20 may be specifically configured to output the original audio signal to an adaptive filter corresponding to the dynamic filtering parameter, so as to obtain a cancellation signal output by the adaptive filter.
Optionally, the apparatus may further include:
and the adjusting module is used for adjusting the parameters of the self-adaptive filter according to the original audio signal and the noise reduction result signal so as to adjust the dynamic filtering parameters.
Optionally, the noise reduction module 40 may be specifically configured to output the feedback input signal to the feedback filter, and obtain a feedback output signal output by the feedback filter; outputting an external environment signal acquired by a feedforward microphone to a feedforward filter to obtain a feedforward output signal output by the feedforward filter; and the loudspeaker playing of the earphone is subjected to noise reduction by utilizing the feedback output signal and the feedforward output signal.
Optionally, the apparatus may further include:
and the feedforward adjusting module is used for adjusting the feedforward noise reduction parameters of the feedforward filter according to the external environment signal and the feedback output signal.
In this embodiment, according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal, the cancellation signal corresponding to the loudspeaker playing signal is obtained by the cancellation obtaining module 20, and the component of the signal broadcasted by the loudspeaker in the sound signal collected by the feedback microphone is cancelled by taking the original audio signal and the noise reduction result signal as reference, so that a purer noise signal is reserved in the feedback input signal, thereby reducing the influence of feedback noise reduction on the low-frequency component in the sound broadcasted by the earphone loudspeaker, improving the noise reduction performance of the earphone, and improving the user experience.
The invention also provides a noise reduction system for an earphone, comprising:
the feedback microphone is used for collecting sound signals; the sound signals comprise noise signals and loudspeaker playing signals;
the adaptive filter is used for acquiring a cancellation signal corresponding to the loudspeaker playing signal according to the original audio signal corresponding to the loudspeaker playing signal and the dynamic filtering parameter; the dynamic filtering parameters correspond to an original audio signal and a noise reduction result signal corresponding to the original audio signal;
the first adder is connected with the feedback microphone and the cancellation filter and used for calculating the difference between the sound signal and the cancellation signal to obtain a feedback input signal;
and the feedback filter is connected with the first adder and is used for acquiring a feedback output signal according to the feedback input signal so as to reduce the noise of the loudspeaker playing of the earphone by using the feedback input signal.
Optionally, the system may further include:
and the digital signal processor is used for adjusting the parameters of the self-adaptive filter according to the original audio signal and the noise reduction result signal so as to adjust the dynamic filtering parameters.
Optionally, the system may further include:
the feedforward microphone is used for acquiring external environment signals;
the feedforward filter is connected with the feedforward microphone and used for acquiring a feedforward output signal according to an external environment signal;
the second adder is connected with the feedforward microphone and the feedback microphone and used for acquiring a noise reduction initial signal according to the feedforward output signal, the feedback output signal and the current original audio signal;
and the amplifier is connected with the second adder and is used for amplifying the noise reduction initial signal and acquiring a noise reduction result signal played by a loudspeaker of the earphone.
Optionally, the digital signal processor may further be configured to adjust a feedforward noise reduction parameter of the feedforward filter according to the external environment signal and the feedback output signal.
In this embodiment, according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal, the cancellation signal corresponding to the loudspeaker playing signal is obtained through the adaptive filter, and the original audio signal and the noise reduction result signal are taken as references to cancel the component of the signal played by the loudspeaker in the sound signal collected by the feedback microphone, so that a purer noise signal is reserved in the feedback input signal, thereby reducing the influence of feedback noise reduction on the low-frequency component in the sound played by the loudspeaker of the earphone, improving the noise reduction performance of the earphone, and improving the user experience.
An embodiment of the present invention further provides a wireless headset, including: the device comprises a loudspeaker, a feedback microphone, a memory and a processor; wherein, the memory is used for storing the computer program, and the processor is used for implementing the steps of the earphone noise reduction method provided by the above embodiment when executing the computer program.
Optionally, the wireless headset provided in this embodiment may further include a feed-forward microphone.
Optionally, the wireless headset provided in this embodiment may be specifically a TWS headset.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the earphone noise reduction method provided in the foregoing embodiment are implemented.
The embodiments are described in a progressive mode in the specification, the emphasis of each embodiment is on the difference from the other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device, the system, the wireless headset and the computer-readable storage medium disclosed in the embodiments correspond to the method disclosed in the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
The method, device and system for reducing noise of an earphone and the wireless earphone provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A method for reducing noise in a headphone, comprising:
acquiring a sound signal collected by a feedback microphone; wherein the sound signal comprises a noise signal and a loudspeaker playing signal;
acquiring a cancellation signal corresponding to the loudspeaker playing signal according to the original audio signal and the dynamic filtering parameter corresponding to the loudspeaker playing signal; wherein the dynamic filtering parameters correspond to the original audio signal and a noise reduction result signal corresponding to the original audio signal;
calculating the difference between the sound signal and the counteracting signal to obtain a feedback input signal;
according to the feedback input signal, carrying out noise reduction on the loudspeaker playing of the earphone;
wherein, according to the feedback input signal, fall making an uproar to the loudspeaker broadcast of earphone, include:
outputting the feedback input signal to a feedback filter to obtain a feedback output signal output by the feedback filter;
outputting an external environment signal acquired by a feedforward microphone to a feedforward filter to obtain a feedforward output signal output by the feedforward filter;
and superposing the feedback output signal, the feedforward output signal and the current original audio signal by using an adder, and obtaining a noise reduction result signal corresponding to the current original audio signal through an amplifier to realize noise reduction of the loudspeaker playing of the earphone.
2. The method of claim 1, wherein the obtaining a cancellation signal corresponding to the speaker playing signal according to the original audio signal and the dynamic filtering parameter corresponding to the speaker playing signal comprises:
and outputting the original audio signal to an adaptive filter corresponding to the dynamic filtering parameters to obtain the cancellation signal output by the adaptive filter.
3. The headphone noise reduction method according to claim 2, further comprising:
and adjusting parameters of the self-adaptive filter according to the original audio signal and the noise reduction result signal so as to adjust the dynamic filtering parameters.
4. The headphone noise reduction method according to claim 3, further comprising:
and adjusting the feedforward noise reduction parameters of the feedforward filter according to the external environment signal and the feedback output signal.
5. An apparatus for reducing noise in a headphone, comprising:
the acquisition module is used for acquiring sound signals acquired by the feedback microphone; wherein the sound signal comprises a noise signal and a loudspeaker playing signal;
the offset acquisition module is used for acquiring an offset signal corresponding to the loudspeaker playing signal according to the original audio signal corresponding to the loudspeaker playing signal and the dynamic filtering parameter; wherein the dynamic filtering parameters correspond to the original audio signal and a noise reduction result signal corresponding to the original audio signal;
the calculating module is used for calculating the difference between the sound signal and the counteracting signal to obtain a feedback input signal;
the noise reduction module is used for reducing noise of the loudspeaker playing of the earphone according to the feedback input signal;
the noise reduction module is specifically configured to output the feedback input signal to a feedback filter, and obtain a feedback output signal output by the feedback filter; outputting an external environment signal acquired by a feedforward microphone to a feedforward filter to obtain a feedforward output signal output by the feedforward filter; and superposing the feedback output signal, the feedforward output signal and the original audio signal by using an adder, and obtaining a noise reduction result signal corresponding to the original audio signal through an amplifier, so as to realize noise reduction on the loudspeaker playing of the earphone.
6. A headphone noise reduction system, comprising:
the feedback microphone is used for collecting sound signals; wherein the sound signal comprises a noise signal and a loudspeaker playing signal;
the adaptive filter is used for acquiring a cancellation signal corresponding to the loudspeaker playing signal according to an original audio signal and a dynamic filtering parameter corresponding to the loudspeaker playing signal; wherein the dynamic filtering parameters correspond to the original audio signal and a noise reduction result signal corresponding to the original audio signal;
the first adder is connected with the feedback microphone and the cancellation filter and used for calculating the difference between the sound signal and the cancellation signal to obtain a feedback input signal;
the feedback filter is connected with the first adder and is used for acquiring a feedback output signal according to the feedback input signal so as to reduce noise of loudspeaker playing of an earphone by using the feedback input signal;
the feedforward microphone is used for acquiring external environment signals;
the feedforward filter is connected with the feedforward microphone and used for acquiring a feedforward output signal according to the external environment signal;
the second adder is connected with the feedforward microphone and the feedback microphone and is used for superposing the feedforward output signal, the feedback output signal and the current original audio signal to obtain a noise reduction initial signal;
and the amplifier is connected with the second adder and used for amplifying the noise reduction initial signal and acquiring a noise reduction result signal played by a loudspeaker of the earphone.
7. The headphone noise reduction system of claim 6, further comprising:
and the digital signal processor is used for adjusting the parameters of the self-adaptive filter according to the original audio signal and the noise reduction result signal so as to adjust the dynamic filtering parameters.
8. A wireless headset, comprising: the device comprises a loudspeaker, a feedback microphone, a memory and a processor; wherein the memory is configured to store a computer program, and the processor is configured to implement the steps of the headphone noise reduction method as claimed in any one of claims 1 to 4 when executing the computer program.
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| CN114040289A (en) * | 2021-11-08 | 2022-02-11 | 广州由我科技股份有限公司 | Earphone noise reduction method and earphone |
| CN114143653A (en) * | 2021-11-30 | 2022-03-04 | 深圳市科奈信科技有限公司 | Earphone reception mode switching method and earphone |
| CN116528099A (en) * | 2022-01-24 | 2023-08-01 | Oppo广东移动通信有限公司 | Audio signal processing method and device, earphone device and storage medium |
| CN117459875A (en) * | 2023-12-21 | 2024-01-26 | 荣耀终端有限公司 | Headset noise reduction method, headset and computer readable storage medium |
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