CN114157957B - Earphone active noise reduction method and device, electronic equipment and readable storage medium - Google Patents
Earphone active noise reduction method and device, electronic equipment and readable storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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Abstract
The application discloses an active noise reduction method and device for a headset, electronic equipment and a readable storage medium, wherein the active noise reduction method for the headset comprises the following steps: collecting a first feedback noise signal through an acoustic wave sensor of the earphone; separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range; and generating an inverse infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the inverse infrasound noise signal. The application solves the technical problem that the active noise reduction effect of the earphone in the prior art is poor.
Description
Technical Field
The present application relates to the field of audio playing technologies, and in particular, to an active noise reduction method and device for headphones, an electronic device, and a readable storage medium.
Background
Along with the improvement of the living standard of people and the acceleration of the work rhythm, the requirements for the active noise reduction earphone are also increased, the requirements are also higher and higher, the active noise reduction earphone can effectively eliminate noise in an environment with noisy environment, better hearing experience is realized, better enjoyment of sound quality and communication are facilitated, but when a user wears the active noise reduction earphone to start a noise reduction function, sound waves of a main frequency band are counteracted, the noise signals with negative feelings such as oppression feeling, palpitation, anxiety and the like on a human body are highlighted, the infrasound noise signals with low frequency are not easy to attenuate, are not easy to be absorbed by water and air, and have strong penetrating capacity and are easy to cause resonance. Although the noise reduction earphone does not increase the component of the infrasound wave, the prominence of the infrasound wave greatly influences the overall effect of active noise reduction and the comfort level of the active noise reduction earphone, and even the body can be hurt when the noise reduction earphone is worn for a long time.
Disclosure of Invention
The application mainly aims to provide an active noise reduction method and device for an earphone, electronic equipment and a readable storage medium, and aims to solve the technical problem that the active noise reduction effect of the earphone is poor in the prior art.
In order to achieve the above object, the present application provides an active noise reduction method for an earphone, the active noise reduction method for an earphone includes:
collecting a first feedback noise signal through an acoustic wave sensor of the earphone;
separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range;
and generating an inverse infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the inverse infrasound noise signal.
Optionally, the step of generating an inverted infrasound noise signal from the infrasound noise signal comprises:
detecting an initial gain value of the infrasound noise signal, wherein the initial gain value is the ratio of the infrasound noise signal to the first feedback noise signal;
And if the initial gain value is in a preset gain value range, generating an inverse-phase infrasound noise signal corresponding to the infrasound noise signal.
Optionally, after the step of detecting the initial gain value of the infrasound noise signal, the method further includes:
if the initial gain value is not in the preset gain value range, acquiring a second feedback noise signal through a feedback microphone of the earphone;
Generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first inverse feedback noise signal through a loudspeaker of the earphone;
collecting a third feedback noise signal through an acoustic wave sensor of the earphone;
separating a target infrasound noise signal from the third feedback noise signal according to a preset frequency range;
And generating an inverse infrasound noise signal corresponding to the target infrasound noise signal.
Optionally, the step of generating the first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value includes:
Determining a target noise reduction parameter of the second feedback noise signal according to the preset gain value range and the initial gain value;
and generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter.
Optionally, the step of determining the target noise reduction parameter of the second feedback noise signal according to the preset gain value range and the initial gain value includes:
Acquiring initial noise reduction parameters of the second feedback noise signal;
Determining a target noise reduction amount of the second feedback noise signal according to the difference value between the preset gain value range and the initial gain value;
and adjusting the initial noise reduction parameter to a target noise reduction parameter according to the target noise reduction amount so that the initial gain value is within the preset gain range.
Optionally, the step of actively reducing noise based on the inverted infrasound noise signal further includes:
Collecting a second feedback noise signal through a feedback microphone of the earphone;
Generating a second inverse feedback noise signal corresponding to the second feedback noise signal;
Coupling the inverted infrasound noise signal and the second inverted feedback noise signal to obtain a noise reduction signal;
and outputting the noise reduction signal through a loudspeaker of the earphone to perform active noise reduction.
The application also provides an active noise reduction device of the earphone, which comprises:
The signal acquisition module is used for acquiring a first feedback noise signal through an acoustic wave sensor of the earphone;
the infrasound separation module is used for separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range;
And the inverse infrasound generating module is used for generating an inverse infrasound noise signal according to the infrasound noise signal and performing active noise reduction based on the inverse infrasound noise signal.
The application also provides an electronic device, which is entity equipment, comprising: the system comprises a memory, a processor and a program of the earphone active noise reduction method, wherein the program of the earphone active noise reduction method is stored in the memory and can be run on the processor, and the program of the earphone active noise reduction method can realize the steps of the earphone active noise reduction method when being executed by the processor.
The present application also provides a readable storage medium having stored thereon a program for implementing the earphone active noise reduction method, the program for implementing the earphone active noise reduction method being executed by a processor to implement the steps of the earphone active noise reduction method as described above.
The application provides an active noise reduction method, device, electronic equipment and readable storage medium of an earphone, which are characterized in that a first feedback noise signal is acquired through an acoustic sensor of the earphone, an infrasound noise signal is separated from the first feedback noise signal according to a preset frequency range, so that the pickup and separation of the infrasound noise signal are realized, an inverted infrasound noise signal is generated according to the infrasound noise signal, active noise reduction is performed based on the inverted infrasound noise signal, the generated inverted infrasound noise signal is counteracted with the existing infrasound noise signal, active elimination of the infrasound noise is realized, the infrasound noise signal perceived by a human body is effectively reduced, especially when the infrasound noise signal is highlighted due to the starting of an active noise reduction function of the earphone, the intensity of the infrasound noise signal is effectively reduced, the uncomfortable feeling generated by the infrasound noise signal is greatly reduced, and the technical problem of poor active noise reduction effect of the earphone in the prior art is overcome.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of an embodiment of an active noise reduction method for an earphone according to the present application;
FIG. 2 is a flowchart of an active noise reduction method for an earphone according to another embodiment of the present application;
FIG. 3 is a schematic diagram of a scenario in which an active noise reduction method for an earphone according to an embodiment of the present application;
Fig. 4 is a schematic device structure diagram of a hardware operating environment related to an active noise reduction method of a tympanic machine according to an embodiment of the present application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the following description of the embodiments accompanied with the accompanying drawings will be given in detail. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In an embodiment of the active noise reduction method for headphones according to the present application, referring to fig. 1, the active noise reduction method for headphones includes:
Step S10, collecting a first feedback noise signal through an acoustic wave sensor of the earphone;
In this embodiment, it should be noted that, the earphone includes an acoustic wave sensor, a filter, a loudspeaker, and the like, where the acoustic wave sensor is a sensor capable of receiving infrasound and audible sound at least, the acoustic wave sensor is disposed at a position in the earphone near an ear canal, and can receive an acoustic wave signal in the ear canal (for example, an audio signal played by the earphone, an echo signal generated by the audio signal, a noise signal generated by the earphone and an ear, an audible noise signal flowing into the ear canal from an external environment, an infrasonic wave signal flowing into the ear canal from an external environment, and the like), the filter is a filter circuit composed of a capacitor, an inductor, a resistor, and the like, the filter can effectively filter a frequency point of a specific frequency in a power line or a frequency other than the frequency point to obtain a power signal of the specific frequency, or eliminate a power signal of the specific frequency, the loudspeaker is an electroacoustic element converting an electrical signal into an acoustic signal in the earphone, the loudspeaker can output an acoustic wave and an acoustic wave, and the loudspeaker is disposed at least near the ear canal in the earphone, and the loudspeaker can be used for noise reduction.
Specifically, a first initial sound wave signal in an auditory canal is collected through a sound wave sensor of an earphone, and is subjected to filtering processing according to an audio signal of playing audio, so that a first feedback noise signal after the audio signal is filtered out is obtained, wherein the first feedback noise signal comprises an infrasound noise signal and an audible noise signal.
Step S20, separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range;
In this embodiment, specifically, the audible noise signal is filtered out from the first feedback noise signal by a frequency divider or a low-pass filter according to a preset frequency range, and the infrasound noise signal is separated, for example: if the infrasound wave needs to be separated, the preset frequency range can be set to be smaller than or equal to 20Hz, signals larger than 20Hz are filtered, if the low-frequency signals need to be separated, a low-frequency range with lower frequency can be set, and signals outside the low-frequency range are filtered.
And step S30, generating an inverse infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the inverse infrasound noise signal.
In this embodiment, specifically, an inverted infrasound noise signal having an equal amplitude to the infrasound noise signal is generated by a feedback filter, and the inverted infrasound noise signal is output into the ear canal by the horn of the earphone, so that the inverted infrasound noise signal and the infrasound noise signal are superimposed, and the infrasound noise signal is cancelled and eliminated, thereby realizing active noise reduction.
In one embodiment, the step of generating an inverted infrasound noise signal from the infrasound noise signal further comprises:
detecting an initial gain value of the infrasound noise signal, wherein the initial gain value is the ratio of the infrasound noise signal to the first feedback noise signal;
If the initial gain value is in a preset gain value range, generating an inverse phase infrasound noise signal corresponding to the infrasound noise signal;
if the initial gain value is not in the preset gain value range, acquiring a second feedback noise signal through a feedback microphone of the earphone;
Denoising the second feedback noise signal according to the initial gain value;
collecting a third feedback noise signal through an acoustic wave sensor of the earphone;
separating a target infrasound noise signal from the third feedback noise signal according to a preset frequency range;
And generating an inverse infrasound noise signal corresponding to the target infrasound noise signal.
In this embodiment, it should be noted that, the earphone further includes a feedback microphone, where the feedback microphone is disposed in the earphone and is near to a microphone at a position of the ear canal, and is configured to receive an audible sound wave signal in the ear canal (for example, an audio signal played by the earphone, an echo signal generated by the audio signal, a noise signal generated by the earphone and the ear, an audible noise signal flowing into the ear canal from an external environment, etc.), where the preset gain value range is a ratio range of the infrasound noise signal in the first feedback noise signal when the human body can sense the infrasound noise signal, and the preset gain value range can be determined in advance according to a sensing degree of the infrasound wave by the human body through a test or a data analysis mode.
Specifically, the noise reduction method for the second feedback noise signal according to the initial gain value includes: determining a target noise reduction parameter of the second feedback noise signal according to the preset gain value range and the initial gain value; and generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter, and outputting the first inverse feedback noise signal through a loudspeaker of the earphone.
In an ideal state, when a user wears the earphone, the earphone is completely attached to the ear, a feedback noise signal of the auditory canal can be completely picked up by the feedback microphone, an anti-phase feedback noise signal which is in equal amplitude anti-phase with the feedback noise signal is generated by the filter and is output by the loudspeaker, at the moment, the content of infrasonic waves in the auditory canal is highest, the content of the infrasonic noise signal which can be separated out is highest, however, the attaching state of the human ear and the earphone can directly influence the accuracy of picking up the noise signal in the auditory canal, a noise leakage phenomenon occurs, the infrasonic wave signal is further interfered by the audible noise signal, the perception capability of a human body is reduced, the occupancy ratio of the separated infrasonic noise signal is reduced, and because in a general active noise reduction process, noise reduction parameters cannot be dynamically changed due to the environment and the wearing mode, when the coupling state is poor, more noise signals are picked up by the feedback microphone, the noise reduction quantity is reduced under the condition that the noise reduction parameters are unchanged, and the active noise reduction effect is reduced.
In this embodiment, by detecting the gain value of the infrasound noise signal and comparing the gain value with the preset gain value range, the bonding state of the current earphone and the ear can be effectively determined, so as to determine whether the noise reduction amount of the current active noise reduction needs to be increased, if the initial gain value is not in the preset gain value range, the bonding of the current earphone and the ear is not tight, and a noise leakage phenomenon is caused, further, according to the initial gain value, the noise reduction parameter of the second feedback noise signal is adjusted, according to the noise reduction parameter, the first inverse feedback noise signal corresponding to the second feedback noise signal is generated, and the noise reduction amount of the second feedback noise signal is increased, so that the further noise reduction of the audible noise in the auditory canal is realized, when the gain value of the infrasound noise signal in the auditory canal is adjusted to be within the preset gain value range, at this moment, the infrasound noise signal in the auditory canal needs to be detected again due to the reduction of the audible noise, and according to the detected target infrasound noise signal, the corresponding inverse noise signal is generated, and the noise reduction effect of the infrasound noise signal in the auditory canal is realized more well.
Optionally, the step of actively reducing noise based on the inverted infrasound noise signal further includes:
step A10, collecting a second feedback noise signal through a feedback microphone of the earphone;
In this embodiment, it should be noted that the earphone further includes a feedback microphone, where the feedback microphone is disposed in the earphone and near the position of the ear canal, and is configured to receive an audible sound wave signal in the ear canal (for example, an audio signal played by the earphone, an echo signal generated by the audio signal, a noise signal generated by the earphone and the ear, an audible noise signal flowing into the ear canal from the external environment, etc.).
Specifically, a feedback microphone of the earphone is used for collecting a second initial sound wave signal in the auditory canal, and filtering processing is carried out on the second initial sound wave signal according to an audio signal of playing audio, so that a second feedback noise signal after the audio signal is filtered is obtained.
Step A20, generating a second inverse feedback noise signal corresponding to the second feedback noise signal;
In this embodiment, specifically, an inverted second inverted feedback noise signal having a constant amplitude with the second feedback noise signal is generated by a feedback filter, and the second inverted feedback noise signal is used to overlap with the second feedback noise signal to cancel out the second feedback noise signal.
Step A30, coupling the inverse infrasound noise signal and the second inverse feedback noise signal to obtain a noise reduction signal;
and step A40, outputting the noise reduction signal through a loudspeaker of the earphone to perform active noise reduction.
In this embodiment, specifically, the inverse infrasound noise signal is received through the feedback filter, the inverse infrasound noise signal and the second inverse feedback noise signal are coupled to obtain a noise reduction signal, the noise reduction signal is output into the ear canal through the loudspeaker of the earphone, so that the noise reduction signal is overlapped with the infrasound noise signal and the second feedback noise signal to cancel and eliminate the infrasound noise signal and the second feedback noise signal, and therefore active noise reduction adjustment of noise signals in two frequency ranges of infrasound waves and audible waves is achieved at the same time, and the overall noise reduction effect of active noise reduction of the earphone is improved.
Optionally, the step of coupling the inverted infrasound noise signal and the second inverted feedback noise signal to obtain a noise reduction signal further includes:
Step B10, acquiring a feedforward noise signal through a feedforward microphone of the earphone;
Step B20, generating an inverse feedforward noise signal corresponding to the feedforward noise signal;
And step B30, coupling the inverse infrasound noise signal, the second inverse feedback noise signal and the inverse feedforward noise signal to obtain a noise reduction signal.
In this embodiment, it should be noted that the earphone further includes a feedforward microphone, where the feedforward microphone is disposed outside the earphone and near a position of the external environment, and is configured to receive an audible sound wave signal of the external environment (for example, an audible noise signal in the external environment, an audio signal played by the earphone leaks into the external environment and is received by the feedforward microphone, etc.).
Specifically, a feedforward noise signal in the external environment is collected through a feedforward microphone of the earphone, an inverted feedforward noise signal which is in equal amplitude with the feedforward noise signal is generated through a feedforward filter, the inverted infrasound noise signal, the second inverted feedback noise signal and the inverted feedforward noise signal are further coupled, a noise reduction signal is obtained, the noise reduction signal is output into an ear canal through a loudspeaker of the earphone, so that the noise reduction signal is overlapped with the infrasound noise signal, the second feedback noise signal and the feedforward noise signal, and the infrasound noise signal, the second feedback noise signal and the feedforward noise signal are cancelled and eliminated, thereby realizing feedforward and feedback mixed active noise reduction of noise signals in two frequency ranges of the infrasound wave and the audible wave, and improving the overall noise reduction effect of active noise reduction of the earphone.
In one implementation manner, as shown in the schematic view of the scenario in fig. 3, a feedforward noise signal in an external environment is picked up by an FF MIC (Feed Forward Microphone ), converted into a feedforward noise digital signal by an ADC (analog to digital converter, analog-digital converter), and then a constant-amplitude inverted signal of the feedforward noise signal is generated by an FF Filter (Feed Forward Filter ), and then volume Gain adjustment is performed by a Gain module, so as to obtain an inverted feedforward noise signal; picking up a first feedback noise signal through an FB MIC (Feed Back Microphone ), converting the first feedback noise signal into a first feedback noise digital signal through an ADC (analog to digital converter, analog-digital converter), picking up a second feedback noise signal containing an infrasonic wave range through an infrasonic wave sensor, converting the second feedback noise signal into a second feedback noise digital signal through an ADC (analog to digital converter, analog-digital converter), separating the infrasonic noise digital signal through a Filter, coupling the second feedback noise digital signal and the infrasonic noise digital signal through the FB Filter, generating a constant-amplitude inversion signal, and performing volume Gain adjustment through a Gain module to obtain an inversion feedback noise signal; after the inverse feedforward noise signal and the inverse feedback noise signal are coupled, the noise signal is converted into a noise reduction signal through a DAC (digital to analog converter, a digital-to-analog converter), and the noise reduction signal is output through a loudspeaker to realize active noise reduction.
In this embodiment, by collecting a preset number of target audio signals in a preset time period and generating average volume values of all the target audio signals, it is realized that the average volume values represent the overall volume value of the audio; through the division of volume intervals, the distinction of volume values with different sizes is realized; then, the volume interval corresponding to the average volume value is determined, so that the volume value of the whole audio can be distinguished; and then, generating gain values corresponding to the average volume values according to different volume intervals, taking the gain values corresponding to the average volume values as the gain values of the volume values of all audio signals of the audio, realizing automatic equalization of the volume values of all audio signals of the audio, and adjusting all audio signals of the whole audio by using the uniform gain values, thereby avoiding the problem that the volume of the audio source cannot ensure that the volume of the output audio signals is too high or too low, realizing effective equalization of the audio signals with different volume values, keeping the original volume difference of the audio, preserving the dynamic characteristics of the sound and ensuring more accurate information transmission.
Further, in another embodiment of the active noise reduction method of the earphone of the present application, referring to fig. 2, the step of generating an inverted infrasound noise signal according to the infrasound noise signal includes:
Step S31, detecting an initial gain value of the infrasound noise signal, wherein the initial gain value is the ratio of the infrasound noise signal to the first feedback noise signal;
In this embodiment, it should be noted that, the first feedback noise signal includes an infrasound noise signal and an audible noise signal in an ear canal, where the audible noise signal in the ear canal may also be collected by a feedback microphone of an earphone, a gain value of the infrasound noise signal is a ratio of the infrasound noise signal in the first feedback noise signal, it is easy to understand that if the audible noise signal in the earphone is more, the infrasound noise signal may be overlapped or not overlapped by the audible noise signal, so that the infrasound noise signal component is unchanged or reduced, a gain value of the detected infrasound noise signal is greatly reduced, an active noise reduction effect is poor, a perception capability of a human body on the infrasound noise signal is reduced, an influence of an infrasound wave on a human body is correspondingly reduced, if the audible noise signal in the earphone is less, a gain value of the detected infrasound noise signal is higher, the infrasound noise signal is highlighted, and an ear pressure is formed after the human body perceives the infrasound noise, and discomfort occurs.
Specifically, a ratio of the infrasound noise signal in the first feedback noise signal is detected through a filter, and the ratio is taken as an initial gain value of the infrasound noise signal.
Step S32, if the initial gain value is within the preset gain value range, generating an inverted infrasound noise signal corresponding to the infrasound noise signal.
In this embodiment, it should be noted that, the preset gain value range is a ratio range of the infrasound noise signal in the first feedback noise signal when the human body can sense the infrasound noise signal, and the preset gain value range may be determined in advance according to the human body sensing degree of the infrasound wave through a test or a data analysis, etc.
Specifically, if the initial gain value is in a preset gain value range, an inverted infrasound noise signal with equal amplitude as the infrasound noise signal is generated through a feedback filter, and if the initial gain value is not in the preset gain value range, an inverted infrasound noise signal with equal amplitude as the infrasound noise signal may or may not be generated.
Optionally, after the step of detecting the initial gain value of the infrasound noise signal, the method further includes:
step S33, if the initial gain value is not in the preset gain value range, a second feedback noise signal is obtained through a feedback microphone of the earphone;
In this embodiment, it should be noted that the earphone further includes a feedback microphone, where the feedback microphone is disposed in the earphone and near the microphone in the ear canal, and is configured to receive audible sound wave signals in the ear canal (for example, an audio signal played by the earphone, an echo signal generated by the audio signal, a noise signal generated by the earphone and the ear, an audible noise signal flowing into the ear canal from the external environment, etc.).
Specifically, if the initial gain value is not in the preset gain value range, the inverse phase infrasound noise signal corresponding to the infrasound noise signal is not generated, and a second feedback noise signal is obtained through a feedback microphone of the earphone, and it is easy to understand that the positions of the feedback microphone and the acoustic wave sensor are similar, and are all positions close to the auditory canal, so that the audible acoustic wave signals in the auditory canal can be received, namely, the second feedback noise signal is similar to the audible noise signals in the first feedback noise signal;
step S34, generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first inverse feedback noise signal through a loudspeaker of the earphone;
In this embodiment, specifically, according to the fact that the initial gain value is not in the preset gain value range, it is determined that the noise reduction amount of the second feedback noise signal is reduced, a noise reduction algorithm of a feedback filter in the earphone is adjusted to increase the noise reduction amount, a first inverse feedback noise signal corresponding to the second feedback noise signal is generated according to the adjusted noise reduction algorithm, the first inverse feedback noise signal is output into an ear canal through a loudspeaker of the earphone, adaptive active noise reduction is achieved, and the overall active noise reduction effect of the earphone is greatly improved.
Optionally, the step of generating the first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value includes:
step C10, determining target noise reduction parameters of the second feedback noise signal according to the preset gain value range and the initial gain value;
In this embodiment, specifically, according to the numerical relation between the preset gain value range and the initial gain value, determining a target noise reduction parameter of the second feedback noise signal, where the manner of determining the target noise reduction parameter of the second feedback noise signal may be to obtain a current noise reduction parameter of the second feedback noise signal, take the second feedback noise signal as an audible noise signal in the first feedback noise signal, calculate, according to the current noise reduction parameter, a current gain value of the secondary noise signal after the audible noise signal is reduced by the initial noise reduction parameter, take, if the current gain value is within the preset gain value range, a current noise reduction parameter as a target noise reduction parameter of the second feedback noise signal, and if the current gain value is still not within the preset gain value range, further adjust the current noise reduction parameter until the current gain value is detected to be within the preset gain value range, and take, as the corresponding current noise reduction parameter when the current gain value is within the preset gain value range, as the target noise reduction parameter of the second feedback noise signal; the method for determining the target noise reduction parameter of the second feedback noise signal may also be that the noise reduction amount required to be increased by the second feedback noise signal is determined according to the difference value between the preset gain value range and the initial gain value, and the target noise reduction parameter of the second feedback noise signal is determined according to the noise reduction amount.
Optionally, the step of determining the target noise reduction parameter of the second feedback noise signal according to the preset gain value range and the initial gain value includes:
step C11, obtaining initial noise reduction parameters of the second feedback noise signal;
In this embodiment, specifically, an initial noise reduction parameter of the second feedback noise signal is obtained, where the initial noise reduction parameter is a noise reduction parameter that needs to be set for reducing noise of the second feedback noise signal in a close-fitting state where an ear-to-ear joint state of the earphone is good, it is easy to understand that in the close-fitting state where the ear-to-ear joint state of the earphone is good, noise reduction is performed on the second feedback noise signal based on the initial noise reduction parameter, at this time, audible sound in an ear canal can be better eliminated, and thus an infrasound noise signal is caused to be highlighted, so that a gain value of the infrasound noise signal detected at this time should be within a preset gain value range.
Step C12, determining a target noise reduction amount of the second feedback noise signal according to the difference value between the preset gain value range and the initial gain value;
and step C13, adjusting the initial noise reduction parameter to a target noise reduction parameter according to the target noise reduction amount so that the initial gain value is within the preset gain range.
In this embodiment, specifically, the second feedback noise signal is substituted as an audible noise signal in the first feedback noise signal into calculation, a target noise reduction amount of reducing the current audible noise signal to a target audible noise signal corresponding to the preset gain value range is determined according to a difference value between the preset gain value range and the initial gain value, and the initial noise reduction parameter is adjusted to a target noise reduction parameter according to the target noise reduction amount, so that the initial gain value is within the preset gain range.
And step C20, generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter.
In this embodiment, specifically, a noise reduction algorithm of a feedback filter in the earphone is adjusted according to the noise reduction parameter to increase the noise reduction amount, and a first inverse feedback noise signal corresponding to the second feedback noise signal is generated according to the adjusted noise reduction algorithm.
Step S35, collecting a third feedback noise signal through an acoustic wave sensor of the earphone;
In this embodiment, specifically, a third initial sound wave signal in the ear canal is collected by the sound wave sensor of the earphone, and the third initial sound wave signal is filtered according to the audio signal of the playing audio, so as to obtain a third feedback noise signal after the audio signal is filtered.
Step S36, separating a target infrasound noise signal from the third feedback noise signal according to a preset frequency range;
In this embodiment, specifically, the audible noise signal is filtered from the third feedback noise signal by a frequency divider or a low-pass filter according to a preset frequency range, and the target infrasound noise signal is obtained by separation.
And step S37, generating an inverse infrasound noise signal corresponding to the target infrasound noise signal.
In the present embodiment, specifically, an inverted infrasound noise signal having an inverse amplitude equal to the target infrasound noise signal is generated by a feedback filter.
In this embodiment, by detecting the gain value of the noise signal and comparing the gain value with the preset gain value range, the bonding state of the current earphone and the ear can be effectively determined, so as to determine whether the noise reduction amount of the current active noise reduction needs to be increased, if the initial gain value is not in the preset gain value range, the bonding of the current earphone and the ear is not tight, and a noise leakage phenomenon exists, further, according to the initial gain value, a first inverse feedback noise signal after the noise reduction amount is increased is generated, so that further noise reduction of audible noise in the ear canal is realized, when the gain value of the noise signal in the ear canal is adjusted to be within the preset gain value range, the active noise reduction effect is optimal, at this time, due to the reduction of the audible noise, the noise signal in the ear canal is more prominent, so that the noise signal in the ear canal needs to be detected again, and a corresponding inverse noise signal is generated according to the target noise signal detected at this time, and a better noise reduction effect is realized on audible noise and noise.
Further, the present application also provides an active noise reduction device for headphones, including:
The signal acquisition module is used for acquiring a first feedback noise signal through an acoustic wave sensor of the earphone;
the infrasound separation module is used for separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range;
And the inverse infrasound generating module is used for generating an inverse infrasound noise signal according to the infrasound noise signal and performing active noise reduction based on the inverse infrasound noise signal.
Optionally, the inverted infrasonic wave generating module is further configured to:
detecting an initial gain value of the infrasound noise signal, wherein the initial gain value is the ratio of the infrasound noise signal to the first feedback noise signal;
And if the initial gain value is in a preset gain value range, generating an inverse-phase infrasound noise signal corresponding to the infrasound noise signal.
Optionally, the inverted infrasonic wave generating module is further configured to:
if the initial gain value is not in the preset gain value range, acquiring a second feedback noise signal through a feedback microphone of the earphone;
Generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first inverse feedback noise signal through a loudspeaker of the earphone;
collecting a third feedback noise signal through an acoustic wave sensor of the earphone;
separating a target infrasound noise signal from the third feedback noise signal according to a preset frequency range;
And generating an inverse infrasound noise signal corresponding to the target infrasound noise signal.
Optionally, the inverted infrasonic wave generating module is further configured to:
Determining a target noise reduction parameter of the second feedback noise signal according to the preset gain value range and the initial gain value;
and generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter.
Optionally, the inverted infrasonic wave generating module is further configured to:
Acquiring initial noise reduction parameters of the second feedback noise signal;
Determining a target noise reduction amount of the second feedback noise signal according to the difference value between the preset gain value range and the initial gain value;
and adjusting the initial noise reduction parameter to a target noise reduction parameter according to the target noise reduction amount so that the initial gain value is within the preset gain range.
Optionally, the inverted infrasonic wave generating module is further configured to:
Collecting a second feedback noise signal through a feedback microphone of the earphone;
Generating a second inverse feedback noise signal corresponding to the second feedback noise signal;
Coupling the inverted infrasound noise signal and the second inverted feedback noise signal to obtain a noise reduction signal;
and outputting the noise reduction signal through a loudspeaker of the earphone to perform active noise reduction.
Optionally, the inverted infrasonic wave generating module is further configured to:
collecting feedforward noise signals through a feedforward microphone of the earphone;
Generating an inverse feedforward noise signal corresponding to the feedforward noise signal;
And coupling the inverse infrasound noise signal, the second inverse feedback noise signal and the inverse feedforward noise signal to obtain a noise reduction signal.
The active noise reduction device for the earphone provided by the invention solves the technical problem of poor active noise reduction effect of the earphone in the prior art by adopting the active noise reduction method for the earphone in the embodiment. Compared with the prior art, the beneficial effects of the active noise reduction device for the earphone provided by the embodiment of the invention are the same as those of the active noise reduction method for the earphone provided by the embodiment, and other technical features of the active noise reduction device for the earphone are the same as those disclosed by the method of the embodiment, so that details are omitted.
Further, an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the active noise reduction method of the earphone in the above embodiment.
Referring now to fig. 4, a schematic diagram of an electronic device suitable for use in implementing embodiments of the present disclosure is shown. The electronic devices in the embodiments of the present disclosure may include, but are not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and the like, and stationary terminals such as digital TVs, desktop computers, and the like. The electronic device shown in fig. 3 is merely an example and should not be construed to limit the functionality and scope of use of the disclosed embodiments.
As shown in fig. 4, the electronic device may include a processing means (e.g., a central processing unit, a graphic processor, etc.), which may perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) or a program loaded from the storage means into a Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the electronic device are also stored. The processing device, ROM and RAM are connected to each other via a bus. An input/output (I/O) interface is also connected to the bus.
In general, the following systems may be connected to the I/O interface: input devices including, for example, touch screens, touch pads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices including, for example, liquid Crystal Displays (LCDs), speakers, vibrators, etc.; storage devices including, for example, magnetic tape, hard disk, etc.; a communication device. The communication means may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. While electronic devices having various systems are shown in the figures, it should be understood that not all of the illustrated systems are required to be implemented or provided. More or fewer systems may alternatively be implemented or provided.
In particular, according to embodiments of the present disclosure, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from a network via a communication device, or installed from a storage device, or installed from ROM. The above-described functions defined in the methods of the embodiments of the present disclosure are performed when the computer program is executed by a processing device.
The electronic equipment provided by the invention adopts the earphone active noise reduction method in the embodiment or the second embodiment, and solves the technical problem that the earphone active noise reduction effect is poor in the prior art. Compared with the prior art, the beneficial effects of the electronic device provided by the embodiment of the invention are the same as those of the active noise reduction method of the earphone provided by the embodiment, and other technical features of the electronic device are the same as those disclosed by the method of the embodiment, so that the description is omitted herein.
It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Further, an embodiment of the present invention provides a computer readable storage medium having computer readable program instructions stored thereon for executing the method for active noise reduction of headphones in the above embodiment.
The computer readable storage medium according to the embodiments of the present invention may be, for example, a usb disk, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this embodiment, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, or device. Program code embodied on a computer readable storage medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, fiber optic cables, RF (radio frequency), and the like, or any suitable combination of the foregoing.
The above-described computer-readable storage medium may be contained in an electronic device; or may exist alone without being assembled into an electronic device.
The computer-readable storage medium carries one or more programs that, when executed by an electronic device, cause the electronic device to: collecting a first feedback noise signal through an acoustic wave sensor of the earphone; separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range; and generating an inverse infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the inverse infrasound noise signal.
Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The modules described in the embodiments of the present disclosure may be implemented in software or hardware. Wherein the name of the module does not constitute a limitation of the unit itself in some cases.
The computer readable storage medium provided by the invention stores the computer readable program instructions for executing the earphone active noise reduction method, and solves the technical problem of poor earphone active noise reduction effect in the prior art. Compared with the prior art, the beneficial effects of the computer readable storage medium provided by the embodiment of the invention are the same as those of the active noise reduction method for the earphone provided by the above embodiment or the second embodiment, and are not described herein.
Further, an embodiment of the present invention also provides a computer program product, which includes a computer program, where the computer program when executed by a processor implements the steps of the active noise reduction method for headphones as described above.
The computer program product provided by the application solves the technical problem that the active noise reduction effect of the earphone in the prior art is poor. Compared with the prior art, the beneficial effects of the computer program product provided by the embodiment of the present application are the same as those of the active noise reduction method for the earphone provided by the above embodiment or the second embodiment, and will not be described herein.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein, or any application, directly or indirectly, within the scope of the application.
Claims (9)
1. The active noise reduction method for the earphone is characterized by comprising the following steps of:
collecting a first feedback noise signal through an acoustic wave sensor of the earphone;
separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range;
generating an inverse infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the inverse infrasound noise signal;
wherein the step of generating an inverted infrasound noise signal from the infrasound noise signal comprises:
detecting an initial gain value of the infrasound noise signal, wherein the initial gain value is the ratio of the infrasound noise signal to the first feedback noise signal;
If the initial gain value is not in the preset gain value range, acquiring a second feedback noise signal through a feedback microphone of the earphone, wherein the preset gain value range is a ratio range of the infrasound noise signal in the first feedback noise signal when the human body perceives the infrasound noise signal;
Generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first inverse feedback noise signal through a loudspeaker of the earphone;
collecting a third feedback noise signal through an acoustic wave sensor of the earphone;
separating a target infrasound noise signal from the third feedback noise signal according to a preset frequency range;
And generating an inverse infrasound noise signal corresponding to the target infrasound noise signal.
2. The method of active noise reduction of headphones of claim 1, further comprising, after the step of detecting an initial gain value of the subsonic noise signal:
And if the initial gain value is in a preset gain value range, generating an inverse-phase infrasound noise signal corresponding to the infrasound noise signal.
3. The method of active noise reduction of headphones as defined in claim 1, wherein the step of generating a first inverted feedback noise signal corresponding to the second feedback noise signal from the initial gain value comprises:
Determining a target noise reduction parameter of the second feedback noise signal according to the preset gain value range and the initial gain value;
and generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter.
4. The method of active noise reduction of headphones as defined in claim 3, wherein the step of determining the target noise reduction parameter of the second feedback noise signal from the preset gain value range and the initial gain value comprises:
Acquiring initial noise reduction parameters of the second feedback noise signal;
Determining a target noise reduction amount of the second feedback noise signal according to the difference value between the preset gain value range and the initial gain value;
and adjusting the initial noise reduction parameter to a target noise reduction parameter according to the target noise reduction amount so that the initial gain value is in the preset gain value range.
5. The method of active noise reduction for headphones of claim 1, wherein the step of actively reducing noise based on the inverted infrasound noise signal further comprises:
Collecting a second feedback noise signal through a feedback microphone of the earphone;
Generating a second inverse feedback noise signal corresponding to the second feedback noise signal;
Coupling the inverted infrasound noise signal and the second inverted feedback noise signal to obtain a noise reduction signal;
and outputting the noise reduction signal through a loudspeaker of the earphone to perform active noise reduction.
6. The method of active noise reduction of headphones as defined in claim 5, wherein the step of coupling the inverted infrasound noise signal and the second inverted feedback noise signal to obtain a noise reduction signal comprises:
collecting feedforward noise signals through a feedforward microphone of the earphone;
Generating an inverse feedforward noise signal corresponding to the feedforward noise signal;
And coupling the inverse infrasound noise signal, the second inverse feedback noise signal and the inverse feedforward noise signal to obtain a noise reduction signal.
7. An active noise reduction device for an earphone, comprising:
The signal acquisition module is used for acquiring a first feedback noise signal through an acoustic wave sensor of the earphone;
the infrasound separation module is used for separating an infrasound noise signal from the first feedback noise signal according to a preset frequency range;
The inverse infrasound generating module is used for generating an inverse infrasound noise signal according to the infrasound noise signal and performing active noise reduction based on the inverse infrasound noise signal;
The inverse infrasound generating module is further configured to detect an initial gain value of the infrasound noise signal, where the initial gain value is a duty ratio of the infrasound noise signal in the first feedback noise signal; if the initial gain value is not in the preset gain value range, acquiring a second feedback noise signal through a feedback microphone of the earphone, wherein the preset gain value range is a ratio range of the infrasound noise signal in the first feedback noise signal when the human body perceives the infrasound noise signal; generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first inverse feedback noise signal through a loudspeaker of the earphone; collecting a third feedback noise signal through an acoustic wave sensor of the earphone; separating a target infrasound noise signal from the third feedback noise signal according to a preset frequency range; and generating an inverse infrasound noise signal corresponding to the target infrasound noise signal.
8. An electronic device, the electronic device comprising:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the earphone active noise reduction method of any one of claims 1 to 6.
9. A readable storage medium, wherein a program for implementing the earphone active noise reduction method is stored on the readable storage medium, and the program for implementing the earphone active noise reduction method is executed by a processor to implement the steps of the earphone active noise reduction method according to any one of claims 1 to 6.
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| CN111800688A (en) * | 2020-03-24 | 2020-10-20 | 深圳市豪恩声学股份有限公司 | Active noise reduction method and device, electronic equipment and storage medium |
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