CN114157957A - 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
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- 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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- 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
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Abstract
The application discloses an earphone active noise reduction method, an earphone active noise reduction device, electronic equipment and a readable storage medium, wherein the earphone active noise reduction method comprises the following steps: collecting a first feedback noise signal through a sound 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 opposite phase infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the opposite phase 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 apparatus for an earphone, an electronic device, and a readable storage medium.
Background
Along with the improvement of living standard and the acceleration of work rhythm of people, the demand for the active noise reduction earphone is also increasing day by day, the requirement is also higher and higher, the active noise reduction earphone can realize effectively eliminating noise in the external noisy environment, better auditory experience is realized, better enjoyment tone quality and communication of people are facilitated, however, when a user wears the active noise reduction earphone to start the noise reduction function, the sound wave of a main frequency band is counteracted, the daily frequency of negative feelings such as oppression, palpitation and anxiety to a human body is less than 20Hz (Hertz) infrasound noise signals to be highlighted, the infrasound wave of low frequency is not easy to attenuate, and is not easy to be absorbed by water and air, and the active noise reduction earphone also has strong penetrating power and is easy to cause resonance. Although the noise reduction earphone does not increase the component of the infrasonic wave, the obvious effect of the infrasonic wave greatly influences the overall effect of active noise reduction and the comfort level of the active noise reduction earphone, and the noise reduction earphone is worn for a long time and even can cause harm to the body.
Disclosure of Invention
The application mainly aims to provide an earphone active noise reduction method, an earphone active noise reduction device, electronic equipment and a readable storage medium, and aims to solve the technical problem that the earphone active noise reduction effect is poor in the prior art.
In order to achieve the above object, the present application provides an active noise reduction method for a headphone, where the active noise reduction method for a headphone includes:
collecting a first feedback noise signal through a sound 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 opposite phase infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the opposite phase infrasound noise signal.
Optionally, the step of generating an inverse 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 a ratio of the infrasound noise signal in the first feedback noise signal;
and if the initial gain value is in a preset gain value range, generating an inverse 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 reverse-phase feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first reverse-phase feedback noise signal through a loudspeaker of an earphone;
collecting a third feedback noise signal through a sound 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 opposite-phase infrasound noise signal corresponding to the target infrasound noise signal.
Optionally, the step of generating a 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 reverse phase 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 an initial noise reduction parameter 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 range.
Optionally, the step of actively reducing noise based on the inverse 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 actively reduce noise.
The application also provides a device of making an uproar falls in earphone initiative, and the device of making an uproar falls in earphone initiative includes:
the signal acquisition module is used for acquiring a first feedback noise signal through a sound wave sensor of the earphone;
the infrasound wave 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 wave generation module is used for generating an inverse infrasound noise signal according to the infrasound noise signal and actively reducing noise based on the inverse infrasound noise signal.
The present application further provides an electronic device, the electronic device is an entity device, the electronic device includes: a memory, a processor and a program of the active noise reduction method for a headphone, stored on the memory and executable on the processor, which program, when executed by the processor, may implement the steps of the active noise reduction method for a headphone as described above.
The application also provides a readable storage medium, on which a program for implementing the active noise reduction method of the earphone is stored, and the program for implementing the active noise reduction method of the earphone is executed by a processor to implement the steps of the active noise reduction method of the earphone.
The application provides an earphone active noise reduction method, an earphone active noise reduction device, electronic equipment and a readable storage medium, wherein a first feedback noise signal is acquired by a sound wave sensor of an earphone, an infrasound noise signal is separated from the first feedback noise signal according to a preset frequency range, the pickup and separation of the infrasound noise signal are realized, an inverse infrasound noise signal is generated according to the infrasound noise signal, active noise reduction is carried out based on the inverse infrasound noise signal, active elimination of infrasound noise is realized by offsetting the generated inverse infrasound noise signal and the originally existing infrasound noise signal, the infrasound noise signal sensed by a human body is effectively reduced, particularly when the infrasound noise signal is highlighted due to the opening of an earphone active noise reduction function, the intensity of the infrasound noise signal can be effectively reduced, and discomfort generated by the infrasound noise signal is greatly reduced, the technical problem of poor active noise reduction effect of the earphone in the prior art is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flowchart of an embodiment of an active noise reduction method for a headphone according to the present application;
fig. 2 is a schematic flowchart of another embodiment of an active noise reduction method for a headphone according to the present application;
fig. 3 is a schematic view of a scene of an embodiment of an active noise reduction method for an earphone according to the present application;
fig. 4 is a schematic device structure diagram of a hardware operating environment related to an active noise reduction method for a headset in an embodiment of the present application.
The objectives, features, and advantages of the present application will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
In an embodiment of the active noise reduction method for a headphone, referring to fig. 1, the active noise reduction method for a headphone includes:
step S10, collecting a first feedback noise signal through a sound wave sensor of the earphone;
in this embodiment, it should be noted that the earphone includes a sound wave sensor, a filter, a speaker, and the like, where the sound wave sensor is a sensor capable of receiving at least infrasound and audible sound, the sound wave sensor is disposed in a position close to the ear canal in the earphone and is capable of receiving sound wave signals in the ear canal (for example, audio signals played by the earphone, echo signals generated by the audio signals, noise signals generated by the earphone and the ear, audible noise signals flowing into the ear canal from an external environment, infrasound wave signals flowing into the ear canal from the external environment, and the like), the filter is a filter circuit composed of a capacitor, an inductor, a resistor, and the like, and the filter is capable of effectively filtering a frequency point of a specific frequency in a power line or frequencies other than the frequency point to obtain a power signal of the specific frequency, or eliminate a power signal after the specific frequency is eliminated, the loudspeaker be in the earphone with the electroacoustic component of signal of telecommunication conversion sound signal, loudspeaker can export infrasonic wave and audible sound wave at least, loudspeaker set up in the earphone near the position of duct, can be same loudspeaker with the loudspeaker of earphone broadcast audio signal, also can be the loudspeaker that is used for making an uproar that resets, do not put the restriction to this embodiment.
Specifically, a first initial sound wave signal in an ear canal is collected through a sound wave sensor of the earphone, the first initial sound wave signal is filtered according to an audio signal of playing audio, and a first feedback noise signal after the audio signal is filtered and removed is obtained, wherein the first feedback noise signal comprises an infrasound noise signal and an audible noise signal.
Step S20, separating infrasound noise signals from the first feedback noise signals according to a preset frequency range;
in this embodiment, specifically, the audible noise signal is filtered from the first feedback noise signal according to a preset frequency range by a frequency divider or a low-pass filter, and the infrasound noise signal is separated, for example: if infrasonic waves need to be separated, the preset frequency range can be set to be less than or equal to 20Hz, signals larger than 20Hz are filtered, and if 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, a reverse phase infrasound noise signal having the same amplitude as the infrasound noise signal is generated by a feedback filter, and the reverse phase infrasound noise signal is output to the ear canal through a speaker of an earphone so as to superimpose the reverse phase infrasound noise signal and the infrasound noise signal, thereby canceling and eliminating the infrasound noise signal, and thus realizing active noise reduction.
In one practical implementation manner, the step of generating an inverse infrasound noise signal according to the infrasound noise signal further includes:
detecting an initial gain value of the infrasound noise signal, wherein the initial gain value is a ratio of the infrasound noise signal in the first feedback noise signal;
if the initial gain value is within a preset gain value range, generating an inverse 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 a sound 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 opposite-phase 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 a microphone near an ear canal of the earphone, 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, and the like), where the preset gain value range is an occupation ratio range of the infrasound noise signal in the first feedback noise signal when the infrasound noise signal can be perceived by a human body, and the preset gain value range may be determined in advance through testing or data analysis and the like according to a perception degree of the infrasound wave by the human body.
Specifically, the manner of denoising 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 reverse-phase feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter, and outputting the first reverse-phase feedback noise signal through a loudspeaker of an earphone.
In an ideal state, when a user wears the earphone, the earphone is completely attached to the ear, the feedback noise signal of the auditory canal can be completely picked up by the feedback microphone, the filter generates an inverse feedback noise signal with the same amplitude and inverse phase as the feedback noise signal and outputs the inverse feedback noise signal through the loudspeaker, at the moment, the content of infrasonic waves in the auditory canal is highest, the content of infrasonic noise signals capable of being separated is highest, however, the attaching state of the human ear and the earphone directly influences the accuracy of picking up the noise signal in the auditory canal, the sound leakage phenomenon occurs, the infrasonic signals are further interfered by audible noise signals, the perception capability of a human body is reduced, the occupation ratio of the separated infrasonic noise signals is reduced, because in the general active noise reduction process, the noise reduction parameters are written and cannot reduce the noise amount due to the dynamic change of the environment and the wearing mode, when the coupling state is not good, more external noise signals are picked up by the feedback microphone, the noise reduction amount is reduced under the condition that the noise reduction parameters are not changed, and the active noise reduction effect is weakened accordingly.
In this embodiment, the gain value of the infrasound noise signal is detected and compared with the preset gain value range, so as to effectively determine the bonding state of the current earphone and the ear, thereby determining 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, it indicates that the current earphone and the ear are not tightly bonded and have a sound leakage phenomenon, 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, the noise reduction amount of the second feedback noise signal is increased, thereby further noise reduction of audible noise in the ear canal is realized, when the gain value of the infrasound noise signal in the ear canal is adjusted to the preset gain value range, the active noise reduction effect reaches the best, at this time, since the audible noise is reduced and more infrasound waves are highlighted, the infrasound noise signals in the auditory canal need to be detected again, and corresponding opposite-phase infrasound noise signals are generated according to the detected target infrasound noise signals, so that a better noise reduction effect is realized on the audible noise and the infrasound noise.
Optionally, the step of actively reducing noise based on the inverse 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, which is disposed in a microphone near the ear canal of the earphone, and is used for receiving 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 sound noise signal flowing into the ear canal from the external environment, etc.).
Specifically, a second initial sound wave signal in the ear canal is collected through a feedback microphone of the earphone, and the second initial sound wave signal is filtered according to an audio signal of the playing audio, so that a second feedback noise signal with the audio signal filtered is obtained.
Step a20, generating a second inverted feedback noise signal corresponding to the second feedback noise signal;
in this embodiment, specifically, a second inverse feedback noise signal with the same amplitude as the second feedback noise signal is generated by a feedback filter, and the second inverse feedback noise signal is used for being superimposed with the second feedback noise signal to cancel and eliminate the second feedback noise signal.
Step A30, coupling the inverted infrasound noise signal and the second inverted feedback noise signal to obtain a noise reduction signal;
and step A40, outputting the noise reduction signal through a loudspeaker of the earphone to actively reduce noise.
In this embodiment, specifically, through feedback filter will receive anti-phase infrasound noise signal, will anti-phase infrasound noise signal with the coupling of second anti-phase feedback noise signal obtains the signal of making an uproar, exports in the duct through the loudspeaker of earphone the signal of making an uproar falls, with through fall the signal of making an uproar with infrasound noise signal with the superposition of second feedback noise signal offsets and eliminates infrasound noise signal with second feedback noise signal to realized simultaneously and fallen the adjustment of making an uproar voluntarily of making an uproar to the noise signal of two frequency ranges of infrasound wave and audible sound wave, improved the whole noise reduction effect that earphone initiative was fallen the noise.
Optionally, the step of coupling the inverse infrasound noise signal and the second inverse 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 inverted infrasound noise signal, the second inverted feedback noise signal and the inverted feedforward noise signal to obtain a noise reduction signal.
In this embodiment, it should be noted that the earphone further includes a feedforward microphone, which is disposed outside the earphone and near the microphone of the external environment, and is used for receiving the audible sound wave signal of the external environment (for example, the audible sound noise signal in the external environment, the audio signal played by the earphone leaking into the external environment and being received by the feedforward microphone, etc.).
Specifically, a feedforward noise signal in the external environment is collected by a feedforward microphone of the earphone, an inverted feedforward noise signal having the same amplitude as the feedforward noise signal and having an inverted phase is generated by a feedforward filter, further coupling the inverse infrasound noise signal, the second inverse feedback noise signal and the inverse feedforward noise signal to obtain a noise reduction signal, outputting the noise reduction signal to the ear canal through a speaker of an earphone so as to offset and eliminate the infrasound noise signal, the second feedback noise signal and the feedforward noise signal through superposition of the noise reduction signal and the infrasound noise signal, the second feedback noise signal and the feedforward noise signal, therefore, feedforward and feedback mixed active noise reduction adjustment of noise signals in two frequency ranges of infrasonic waves and audible sound waves is realized simultaneously, and the overall noise reduction effect of active noise reduction of the earphone is improved.
In an implementation manner, as shown in a scene diagram of fig. 3, a Feed-Forward noise signal in an external environment is picked up by an FF MIC (Feed-Forward Microphone), and is converted into a Feed-Forward noise digital signal by an ADC (analog-to-digital converter), and then a constant amplitude inverse signal of the Feed-Forward noise signal is generated by an FF Filter, and then a Gain module is used to perform volume Gain adjustment to obtain an inverse Feed-Forward 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), 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 the ADC (analog to 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 to generate a constant-amplitude reverse phase signal, and performing volume Gain adjustment through a Gain module to obtain a reverse phase feedback noise signal; after the inverse feedforward noise signal and the inverse feedback noise signal are coupled, the signals are converted into noise reduction signals through a digital to analog converter (DAC), and the noise reduction signals are output through a loudspeaker to realize active noise reduction.
In the embodiment, the average volume value representing the integral volume value of the audio is realized by collecting the target audio signals of the preset number of preset time periods and generating the average volume value of all the target audio signals; the volume values of different sizes are distinguished through the division of the volume intervals; then, the integral volume value of the audio can be distinguished by determining the volume interval corresponding to the average volume value; and then, the gain values corresponding to the average volume values are generated according to different volume intervals, and the gain values corresponding to the average volume values are used as the gain values of the volume values of all audio signals of the audio, so that the automatic equalization of the volume values of all audio signals of the audio is realized, and all audio signals of the whole audio are adjusted by using uniform gain values, thereby not only avoiding the problem that the volume of a sound source cannot ensure that the volume of the output audio signals is too high or too low, realizing the effective equalization of the audio with different volume values, but also keeping the original difference of the volume values of the audio, retaining the dynamic characteristics of the sound, and enabling the information transfer to be more accurate.
Further, in another embodiment of the active noise reduction method for a headphone of the present application, referring to fig. 2, the step of generating an inverse infrasound noise signal according to the infrasound noise signal includes:
step S31, detecting an initial gain value of the infrasound noise signal, where the initial gain value is a ratio of the infrasound noise signal in 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 the ear canal, where the audible noise signal in the ear canal can be collected by a feedback microphone of an earphone, and a gain value of the infrasound noise signal is a ratio of the infrasound noise signal to the first feedback noise signal, it is easy to understand that, if there are many audible noise signals in the earphone, the infrasound noise signal may be superimposed or not superimposed by the audible noise signal, resulting in a constant or reduced infrasound noise signal component, then the gain value of the detected infrasound noise signal is greatly reduced, the active noise reduction effect is poor, the perception capability of the human body on the infrasound noise signal is reduced, the influence of the infrasound wave on the human body is correspondingly reduced, if there are few audible noise signals in the earphone, the gain value of the detected infrasound noise signal is high, the infrasound noise signal is prominent, and the human body senses the formation of the ear pressure after the infrasound wave, so that the human body can feel uncomfortable.
Specifically, a ratio of the infrasound noise signal in the first feedback noise signal is detected by a filter, and the ratio is used as an initial gain value of the infrasound noise signal.
Step S32, if the initial gain value is within a preset gain value range, generating an inverse 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 value range of the infrasound noise signal in the first feedback noise signal when the human body can perceive the infrasound noise signal, and the preset gain value range may be determined in advance through testing or data analysis and the like according to a perception degree of the human body to the infrasound wave.
Specifically, if the initial gain value is within a preset gain value range, an inverse infrasound noise signal having an inverse phase with an amplitude equal to that of the infrasound noise signal is generated through a feedback filter, and if the initial gain value is not within the preset gain value range, an inverse infrasound noise signal having an inverse phase with an amplitude equal to that of the infrasound noise signal may be generated or not.
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, which is disposed in the earphone near the ear canal, and is used for receiving 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 sound noise signal flowing into the ear canal from the external environment, etc.).
Specifically, if the initial gain value is not within the preset gain value range, an inverse 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, it is easy to understand that since the position of the feedback microphone is close to that of the sound wave sensor, and both the position of the feedback microphone and the position of the sound wave sensor are close to the ear canal, audible sound wave signals in the ear canal can be received, that is, the second feedback noise signal is close to the audible sound noise signal 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 speaker of an earphone;
in this embodiment, specifically, according to that the initial gain value is not within the preset gain value range, it is determined that the noise reduction amount of the second feedback noise signal is decreased, the noise reduction algorithm of the feedback filter in the earphone is adjusted to increase the noise reduction amount, the first inverse feedback noise signal corresponding to the second feedback noise signal is generated according to the adjusted noise reduction algorithm, and the first inverse feedback noise signal is output into the ear canal through the speaker of the earphone, so that adaptive active noise reduction is achieved, and the overall active noise reduction effect of the earphone is greatly improved.
Optionally, the step of generating a first inverse feedback noise signal corresponding to the second feedback noise signal according to the initial gain value includes:
step C10, determining a target noise reduction parameter of the second feedback noise signal according to the preset gain value range and the initial gain value;
in this embodiment, specifically, the target noise reduction parameter of the second feedback noise signal is determined according to the numerical relationship between the preset gain value range and the initial gain value, where the method for 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, use 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 infrasonic noise signal after the audible noise signal is subjected to noise reduction by the initial noise reduction parameter, use the current noise reduction parameter as the target noise reduction parameter of the second feedback noise signal if the current gain value is within the preset gain value range, and further adjust the current noise reduction parameter if the current gain value is still not within the preset gain value range, until the current gain value is detected to be within the preset gain value range, taking the corresponding current noise reduction parameter when the current gain value is within the preset gain value range as a target noise reduction parameter of the second feedback noise signal; the target noise reduction parameter of the second feedback noise signal may also be determined by determining a noise reduction amount required to be increased for the second feedback noise signal according to a difference between the preset gain value range and the initial gain value, and determining the target noise reduction parameter of the second feedback noise signal 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, acquiring an initial noise reduction parameter 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 tight fit state where the earphone and the ear are in a good fit state, it is easy to understand that, in the tight fit state where the earphone and the ear are in a good fit state, the second feedback noise signal is reduced in noise based on the initial noise reduction parameter, at this time, the audible sound in the ear canal is eliminated well enough, and then the infrasound noise signal is caused to be highlighted, so that the 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 in the preset gain range.
In this embodiment, specifically, the second feedback noise signal is substituted and calculated as an audible noise signal in the first feedback noise signal, a target noise reduction amount of a target audible noise signal corresponding to a current audible noise signal reduced to the preset gain value range is determined according to a difference 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 headphone is adjusted according to the noise reduction parameter to increase a 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 a sound wave sensor of the earphone;
in this embodiment, specifically, a third initial sound wave signal in the ear canal is collected by a sound wave sensor of the earphone, and the third initial sound wave signal is filtered according to an audio signal of the playing audio, so as to obtain a third feedback noise signal after the audio signal is filtered and removed.
Step S36, separating a target infrasound noise signal from the third feedback noise signal according to a preset frequency range;
in this embodiment, specifically, according to a preset frequency range, an audible noise signal is filtered from the third feedback noise signal through a frequency divider or a low-pass filter, and a target infrasound noise signal is obtained through separation.
Step S37 is to generate an inverted infrasound noise signal corresponding to the target infrasound noise signal.
In the present embodiment, specifically, an inverted infrasound noise signal of an opposite phase having the same amplitude as the target infrasound noise signal is generated by the feedback filter.
In this embodiment, the gain value of the infrasound noise signal is detected and compared with the preset gain value range, so as to effectively determine the bonding state of the current earphone and the ear, thereby determining 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, it indicates that the current earphone and the ear are not tightly bonded and have a sound leakage phenomenon, and further, according to the initial gain value, a first inverse feedback noise signal after the noise reduction amount is increased is generated, thereby realizing further noise reduction of the audible noise in the ear canal, when the gain value of the infrasound noise signal in the ear canal is adjusted to the preset gain value range, the active noise reduction effect reaches the best, at this time, as the audible noise is reduced, more infrasound waves are highlighted, so that the infrasound noise signal in the ear canal needs to be detected again, and generating a corresponding opposite phase infrasound noise signal according to the detected target infrasound noise signal, thereby realizing better noise reduction effect on both audible noise and infrasound noise.
Further, the present application also provides an active noise reduction device for a headphone, the active noise reduction device for a headphone comprising:
the signal acquisition module is used for acquiring a first feedback noise signal through a sound wave sensor of the earphone;
the infrasound wave 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 wave generation module is used for 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 inverse infrasonic wave generating module is further configured to:
detecting an initial gain value of the infrasound noise signal, wherein the initial gain value is a ratio of the infrasound noise signal in the first feedback noise signal;
and if the initial gain value is in a preset gain value range, generating an inverse infrasound noise signal corresponding to the infrasound noise signal.
Optionally, the inverse 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 reverse-phase feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first reverse-phase feedback noise signal through a loudspeaker of an earphone;
collecting a third feedback noise signal through a sound 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 opposite-phase infrasound noise signal corresponding to the target infrasound noise signal.
Optionally, the inverse 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 reverse phase feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter.
Optionally, the inverse infrasonic wave generating module is further configured to:
acquiring an initial noise reduction parameter 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 range.
Optionally, the inverse 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 actively reduce noise.
Optionally, the inverse infrasonic wave generating module is further configured to:
collecting a feedforward noise signal through a feedforward microphone of the headset;
generating an inverted feedforward noise signal corresponding to the feedforward noise signal;
and coupling the inverted infrasound noise signal, the second inverted feedback noise signal and the inverted feedforward noise signal to obtain a noise reduction signal.
The active noise reduction device for the earphone provided by the invention adopts the active noise reduction method for the earphone in the embodiment, so that the technical problem of poor active noise reduction effect of the earphone in the prior art is solved. 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 the beneficial effects 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 for the embodiment, which are not repeated herein.
Further, an embodiment of the present invention provides an electronic device, where the electronic device includes: 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, the instructions being executable by the at least one processor to enable the at least one processor to perform the earphone active noise reduction method in the above embodiments.
Referring now to FIG. 4, shown is a schematic diagram of an electronic device suitable for use in implementing embodiments of the present disclosure. 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., car navigation terminals), and the like, and fixed terminals such as digital TVs, desktop computers, and the like. The electronic device shown in fig. 3 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present disclosure.
As shown in fig. 4, the electronic device may include a processing means (e.g., a central processing unit, a graphic processor, etc.) that can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) or a program loaded from a storage means into a Random Access Memory (RAM). In the RAM, various programs and data necessary for the operation of the electronic apparatus are also stored. The processing device, the ROM, and the RAM are connected to each other by a bus. An input/output (I/O) interface is also connected to the bus.
Generally, 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, and the like; output devices including, for example, Liquid Crystal Displays (LCDs), speakers, vibrators, and the like; storage devices including, for example, magnetic tape, hard disk, etc.; and a communication device. The communication means may allow the electronic device to communicate wirelessly or by wire with other devices to exchange data. While the figures illustrate an electronic device with various systems, it is to be understood that not all illustrated systems are required to be implemented or provided. More or fewer systems may alternatively be implemented or provided.
In particular, according to an embodiment of the present disclosure, the processes described above with reference to the 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 illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication means, or installed from a storage means, or installed from a ROM. The computer program, when executed by a processing device, performs the above-described functions defined in the methods of the embodiments of the present disclosure.
The electronic device provided by the invention adopts the earphone active noise reduction method in the embodiment or the second embodiment, so that the technical problem of poor active noise reduction effect of the earphone in the prior art is solved. Compared with the prior art, the beneficial effects of the electronic device provided by the embodiment of the invention are the same as the beneficial effects of the earphone active noise reduction method provided by the embodiment, and other technical features of the electronic device are the same as those disclosed by the embodiment method, which are not repeated herein.
It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Further, embodiments of the present invention provide a computer-readable storage medium having computer-readable program instructions stored thereon for performing the method for active noise reduction of a headset in the above embodiments.
The computer readable storage medium provided by the embodiments of the present invention may be, for example, a USB flash disk, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or any combination thereof. 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 the present 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, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
The computer-readable storage medium may be embodied in an electronic device; or may be present alone without being incorporated into the electronic device.
The computer readable storage medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: collecting a first feedback noise signal through a sound 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 opposite phase infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the opposite phase infrasound noise signal.
Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of 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 type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The flowchart 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 by software or hardware. Wherein the names of the modules do not in some cases constitute a limitation of the unit itself.
The computer readable storage medium provided by the invention stores the computer readable program instruction for executing the earphone active noise reduction method, and solves the technical problem that the earphone active noise reduction effect in the prior art is poor. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the embodiment of the present invention are the same as the beneficial effects of the earphone active noise reduction method provided by the above embodiment or the second embodiment, and are not described herein again.
Further, an embodiment of the present invention also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the method for actively reducing noise of a headphone as described above are implemented.
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 invention are the same as the beneficial effects of the earphone active noise reduction method provided by the above embodiment or the second embodiment, and are not described herein again.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.
Claims (10)
1. An active noise reduction method for a headphone is characterized by comprising the following steps:
collecting a first feedback noise signal through a sound 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 opposite phase infrasound noise signal according to the infrasound noise signal, and actively reducing noise based on the opposite phase infrasound noise signal.
2. The headphone active noise reduction method of claim 1, wherein the step of generating an inverse 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 a ratio of the infrasound noise signal in the first feedback noise signal;
and if the initial gain value is in a preset gain value range, generating an inverse infrasound noise signal corresponding to the infrasound noise signal.
3. The headphone active noise reduction method of claim 2, wherein the step of detecting the initial gain value of the infrasound noise signal is followed by further comprising:
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 reverse-phase feedback noise signal corresponding to the second feedback noise signal according to the initial gain value, and outputting the first reverse-phase feedback noise signal through a loudspeaker of an earphone;
collecting a third feedback noise signal through a sound 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 opposite-phase infrasound noise signal corresponding to the target infrasound noise signal.
4. The active noise reduction method for headphones as claimed in claim 3, wherein the step of generating the first inverse feedback noise signal corresponding to the second feedback noise signal according to 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 reverse phase feedback noise signal corresponding to the second feedback noise signal according to the noise reduction parameter.
5. The method of claim 4, wherein 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 comprises:
acquiring an initial noise reduction parameter 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 range.
6. The headphone active noise reduction method of claim 1, wherein the step of actively reducing noise based on the inverse 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 actively reduce noise.
7. The active noise reduction method for headphones of claim 6, 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 a feedforward noise signal through a feedforward microphone of the headset;
generating an inverted feedforward noise signal corresponding to the feedforward noise signal;
and coupling the inverted infrasound noise signal, the second inverted feedback noise signal and the inverted feedforward noise signal to obtain a noise reduction signal.
8. An active noise reduction device for a headphone, the active noise reduction device comprising:
the signal acquisition module is used for acquiring a first feedback noise signal through a sound wave sensor of the earphone;
the infrasound wave 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 wave generation module is used for generating an inverse infrasound noise signal according to the infrasound noise signal and actively reducing noise based on the inverse infrasound noise signal.
9. An electronic device, characterized in that the electronic device comprises:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the headset active noise reduction method of any of claims 1 to 7.
10. A readable storage medium, characterized in that the readable storage medium has stored thereon a program for implementing the active noise reduction method for a headphone, the program for implementing the active noise reduction method for a headphone being executed by a processor to implement the steps of the active noise reduction method for a headphone according to any one of claims 1 to 7.
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