CN114501221B - Earphone noise reduction method and device, earphone equipment and storage medium - Google Patents
Earphone noise reduction method and device, earphone equipment and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000009432 framing Methods 0.000 claims description 53
- 230000000694 effects Effects 0.000 abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000006870 function Effects 0.000 description 7
- 230000005236 sound signal Effects 0.000 description 7
- 230000001629 suppression Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
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- 210000000613 ear canal Anatomy 0.000 description 1
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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
- G10K11/1785—Methods, e.g. algorithms; Devices
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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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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
- Headphones And Earphones (AREA)
Abstract
The invention discloses a method and a device for noise reduction of an earphone, earphone equipment and a storage medium, wherein the method comprises the following steps: branching signals picked up by a feedback microphone in the earphone equipment to obtain a first path of signals and a second path of signals; noise reduction processing is carried out on a first preset frequency band part of the first path of signals to obtain first noise reduction signals, and amplitude zero setting is carried out on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals; performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on the second path of signals to obtain a second cut-off signal; and adding the first cut-off signal and the second cut-off signal, and outputting the added signals by adopting a loudspeaker of the earphone device. The invention realizes the reduction of the extra noise caused by the water bed effect in the feedback noise reduction and improves the experience of users in using the active noise reduction function of the earphone.
Description
Technical Field
The present invention relates to the field of headphones technologies, and in particular, to a method and apparatus for noise reduction of headphones, a headphone device, and a storage medium.
Background
In recent years, active noise reduction headphones bring people with better hearing experience in a noise environment. Feedback noise reduction is one implementation of active noise reduction. The feedback noise reduction principle is that a noise signal at the human ear is picked up by a feedback microphone, then low-frequency noise reduction is carried out on the noise signal, and the noise signal is played by a loudspeaker so as to offset the noise signal at the human ear. Because the process is a closed loop process, there is a water bed effect, i.e. the low frequency part is suppressed, which can bring about the elevation of the high frequency part, thereby introducing additional noise and causing bad experience to the user.
Disclosure of Invention
The invention mainly aims to provide a headset noise reduction method, device, headset equipment and storage medium, and aims to provide a headset noise reduction scheme for reducing extra noise caused by a water bed effect in feedback noise reduction and improving the experience of a user in using a headset active noise reduction function.
In order to achieve the above object, the present invention provides a method for noise reduction of an earphone, the method is applied to an earphone device, and the method includes the following steps:
branching signals picked up by a feedback microphone in the earphone equipment to obtain a first path of signals and a second path of signals;
noise reduction processing is carried out on a first preset frequency band part of the first path of signals to obtain first noise reduction signals, and amplitude zero setting is carried out on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals;
Performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on the second path of signals to obtain a second cut-off signal;
and adding the first cut-off signal and the second cut-off signal, and outputting the added signals by adopting a loudspeaker of the earphone device.
Optionally, performing, based on the second signal, an amplitude zero setting process for a frequency band portion outside the second preset frequency band, and the step of obtaining a second truncated signal includes:
And carrying out noise reduction processing on a second preset frequency band part of the second path of signal to obtain a second noise reduction signal, and carrying out amplitude zero setting on a frequency band part outside the second preset frequency band in the second noise reduction signal to obtain a second cut-off signal.
Optionally, the step of performing noise reduction processing on a first preset frequency band portion of the first path of signal to obtain a first noise reduction signal, and performing amplitude zero setting on a second preset frequency band portion in the first noise reduction signal to obtain a first cut-off signal includes:
Carrying out framing and windowing processing on the first path of signals to obtain first path of framing signals, and converting the first path of framing signals from a time domain to a frequency domain to obtain first path of frequency domain signals;
Noise reduction processing is carried out on a first preset frequency band part of the first path of frequency domain signals to obtain first noise reduction signals, and amplitude zero setting is carried out on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals;
The step of performing amplitude zero setting processing for the frequency band part outside the second preset frequency band based on the second path signal to obtain a second cut-off signal comprises the following steps:
carrying out framing and windowing processing on the second channel of signals to obtain second channel of framing signals, and converting the second channel of framing signals from a time domain to a frequency domain to obtain second channel of frequency domain signals;
Performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on the second path of frequency domain signals to obtain a second cut-off signal;
the step of adding the first cut-off signal and the second cut-off signal and outputting the added first cut-off signal and the added second cut-off signal by using a speaker of the earphone device comprises the following steps:
The first truncated signal and the second truncated signal are added and then converted from a frequency domain to a time domain, and then output by a loudspeaker of the earphone device.
Optionally, the step of performing frame-division windowing processing on the first path of signal to obtain a first path of frame-division signal includes:
And carrying out framing and windowing processing on the first path of signals by adopting a non-rectangular window to obtain first path of framing signals.
Optionally, the step of adding the first truncated signal and the second truncated signal and outputting the first truncated signal by using a speaker of the earphone device includes:
adding the first truncated signal and the second truncated signal to obtain a mixed signal;
Carrying out noise tracking on the mixed signal by adopting a recursive minimum average algorithm to obtain a secondary noise reduction signal;
a speaker of the earphone device is used for outputting a secondary noise reduction signal.
Optionally, the method further comprises:
acquiring a feedforward signal picked up by a feedforward microphone in the earphone device;
Noise reduction processing is carried out on the feedforward signal to obtain a third noise reduction signal;
the step of adding the first cut-off signal and the second cut-off signal and outputting the added first cut-off signal and the added second cut-off signal by using a speaker of the earphone device comprises the following steps:
and adding the first cut-off signal, the second cut-off signal and the third noise reduction signal, and outputting the added signals by adopting a loudspeaker of the earphone device.
Optionally, the step of performing noise reduction processing on a first preset frequency band portion of the first path signal to obtain a first noise reduction signal includes:
acquiring a noise reduction frequency band and a noise reduction grade which are set in the earphone equipment, and taking the noise reduction frequency band as a first preset frequency band;
performing noise reduction processing on a first preset frequency band part of the first path of signals according to the noise reduction level to obtain first noise reduction signals;
The method further comprises the steps of:
and taking the frequency band outside the first preset frequency band as a second preset frequency band.
In order to achieve the above object, the present invention further provides a device for noise reduction of an earphone, where the device is disposed in an earphone device, the device includes:
the branching module is used for branching signals picked up by the feedback microphone in the earphone equipment to obtain a first path of signals and a second path of signals;
The first cut-off module is used for carrying out noise reduction processing on a first preset frequency band part of the first path of signal to obtain a first noise reduction signal, and carrying out amplitude zero setting on a second preset frequency band part in the first noise reduction signal to obtain a first cut-off signal;
The second cut-off module is used for carrying out amplitude zero setting processing on frequency band parts outside a second preset frequency band based on a second path of signals to obtain second cut-off signals;
And the output module is used for outputting the first truncated signal and the second truncated signal by adopting a loudspeaker of the earphone device after adding the first truncated signal and the second truncated signal.
To achieve the above object, the present invention also provides an earphone device including: the device comprises a memory, a processor and a headset noise reduction program stored on the memory and capable of running on the processor, wherein the headset noise reduction program realizes the steps of the headset noise reduction method when being executed by the processor.
In addition, in order to achieve the above object, the present invention also proposes a computer-readable storage medium, on which a headset noise reduction program is stored, which when executed by a processor implements the steps of the headset noise reduction method as above.
According to the invention, the signals picked up by the feedback microphone of the earphone equipment are divided into two paths, the first path of signals are subjected to noise reduction processing aiming at a first preset frequency band, and the amplitude of a second preset frequency band part is set to zero, so that a first cut-off signal is obtained, the closed loop process of the second preset frequency band is blocked while the first preset frequency band in the first path of signals is subjected to noise reduction, and the second preset frequency band part is prevented from being lifted due to the suppression of the first preset frequency band; and the amplitude of the frequency band part outside the second preset frequency band is set to zero based on the second path of signals, so that a second cut-off signal is obtained, the signals of the second preset frequency band part which are absent in the first cut-off signal are supplemented through the second cut-off signal, and the first cut-off signal and the second cut-off signal are added and then played through a loudspeaker, so that the noise suppression on the first preset frequency band is finally realized, the generation of a water bed effect is avoided, and the experience of a user using the earphone is improved.
Drawings
FIG. 1 is a flowchart of a first embodiment of a method for noise reduction of an earphone according to the present invention;
fig. 2 is a schematic functional block diagram of a headset noise reduction device according to a preferred embodiment of the invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a first embodiment of a method for noise reduction of an earphone according to the present invention.
Embodiments of the present invention provide embodiments of methods of earphone noise reduction, it being noted that although a logical sequence is shown in the flow chart, in some cases the steps shown or described may be performed in a different order than that shown or described herein. The earphone noise reduction method is applied to earphone equipment, and when the earphone equipment comprises two earphones, the event reminding method can be applied to any earphone. In this embodiment, the earphone noise reduction method includes:
Step S10, branching signals picked up by a feedback microphone in the earphone equipment to obtain a first path of signals and a second path of signals;
In this embodiment, in order to reduce extra noise caused by a water bed effect in feedback noise reduction, improve the experience of a user using an active noise reduction function of an earphone, the signals picked up by a feedback microphone in the earphone device may be processed in two paths, and the corresponding frequency band portions of the two paths of signals may be truncated and then added and output, so as to avoid the situation that another part of frequency band is raised when the partial frequency band is suppressed in a blocking closed loop manner.
In particular, a feedback microphone in the earphone device is typically disposed in a position closer to the user's ear canal to represent sound received by the user's ear by a sound signal picked up by the feedback microphone. When the earphone device performs feedback noise reduction or hybrid noise reduction, a feedback microphone is required to be adopted to pick up a sound signal, and noise reduction processing is performed on the sound signal to obtain a noise reduction signal for reducing noise of sound received by the ears of the user, namely, the noise signal leaked into the auditory canal and audible by the ears of the user is expected to be counteracted by playing the noise reduction signal, so that the effect of active noise reduction is achieved.
In this embodiment, after the earphone device picks up the sound signal through the feedback microphone, the picked-up sound signal is split to obtain a first path of signal and a second path of signal. That is, the original signal is duplicated to obtain the same two paths of signals.
Further, in an embodiment, an active noise reduction function may be set in the earphone device, and when the active noise reduction function is detected to be turned on, the earphone device picks up a signal through the feedback microphone and performs a branching process.
Step S20, carrying out noise reduction processing on a first preset frequency band part of a first path of signal to obtain a first noise reduction signal, and carrying out amplitude zero setting on a second preset frequency band part in the first noise reduction signal to obtain a first cut-off signal;
After obtaining the first path of signal and the second path of signal, the earphone device may perform noise reduction processing on a first preset frequency band portion of the first path of signal to obtain a noise reduction signal (hereinafter referred to as a first noise reduction signal to show distinction). The first preset frequency band may be a preset frequency band, which indicates a frequency band that needs to be noise reduced, and may be set to 0-1kHz, for example. The specific process of performing the noise reduction process for the first preset frequency band of the first path signal may refer to the noise reduction process in the feedback noise reduction, which is not limited herein. For example, in an embodiment, the earphone device may perform phase inversion on a signal in a first preset frequency band in the first path of signal by 180 ° to obtain a first noise reduction signal; or when the loudspeaker of the earphone device plays the audio signal, the audio signal in the first path of signal can be removed, and then the phase of the signal in the first preset frequency band is turned 180 degrees, so as to obtain the first noise reduction signal.
After the earphone device obtains the first noise reduction signal, the amplitude of the second preset frequency band part in the first noise reduction signal can be set to zero, and the obtained signal is called a first cut-off signal to show distinction. That is, the amplitude of the signal of the second preset frequency band in the first noise reduction signal is set to zero, and the closed loop process of the second preset frequency band in the first path of signal is blocked, so that the signal of the second preset frequency band is prevented from being lifted when the signal of the first preset frequency band in the first path of signal is restrained.
The second preset frequency band may be a frequency band in which the signal is raised after the first preset frequency band is suppressed. For example, if the first preset frequency band is a low frequency, the second preset frequency band is a medium-high frequency, and the numerical range of the specific frequency band can be set according to the needs, which is not limited herein. Further, in an embodiment, to avoid introducing new noise after the two signals are added last, the frequency band outside the first preset frequency band may be set to a second preset frequency band, for example, the first preset frequency band is 0-1kHz (including 1 kHz), and then the second preset frequency band may be set to be greater than 1kHz.
Further, in an embodiment, the step of performing noise reduction processing on the first preset frequency band portion of the first path signal in step S20 to obtain a first noise reduction signal includes:
step a, obtaining a noise reduction frequency band and a noise reduction grade which are set in earphone equipment, and taking the noise reduction frequency band as a first preset frequency band;
The noise reduction frequency band and the noise reduction grade of the active noise reduction function can be set in the earphone equipment, and when the earphone equipment needs to perform noise reduction processing on the first path of signals, the noise reduction frequency band and the noise reduction grade can be obtained, and the noise reduction frequency band is used as a first preset frequency band. In an embodiment, the noise reduction level may be custom set by a user in the headset device by voice commands or key commands.
Step b, performing noise reduction processing on a first preset frequency band part of the first path of signals according to the noise reduction level to obtain first noise reduction signals;
When the earphone device performs noise reduction processing on the first preset frequency band part of the first path of signal, the earphone device may perform noise reduction processing according to the obtained noise reduction level to obtain a first noise reduction signal.
The method further comprises the steps of:
And c, taking the frequency band outside the first preset frequency band as a second preset frequency band.
After the first preset frequency band is set, the earphone device can take the frequency band outside the first preset frequency band as a second preset frequency band so as to avoid introducing new noise after the last addition of the two paths of signals.
Step S30, performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on a second path of signal to obtain a second cut-off signal;
Since the second preset frequency band portion is truncated in the first path signal, the earphone device can supplement the signal of the second preset frequency band portion through the second path signal. Specifically, the amplitude zero setting process for the frequency band portion outside the second preset frequency band may be performed based on the second path signal, and the resulting signal is referred to as a second truncated signal to show distinction. In an embodiment, the earphone device may directly perform amplitude zero setting processing on signals of the frequency band portion outside the second preset frequency band in the second path of signals to obtain a second truncated signal. In other embodiments, the earphone device may perform noise reduction processing on a second preset frequency band portion in the second signal, and then perform amplitude zero setting on a frequency band portion other than the second preset frequency band portion. It can be understood that, when the second preset frequency band is set to a frequency band other than the first preset frequency band, the earphone device performs the amplitude zero setting process for the first preset frequency band portion based on the second path signal to obtain the second cut-off signal.
Step S40, the first cut-off signal and the second cut-off signal are added and then output through a loudspeaker of the earphone device.
After obtaining the first cut-off signal, the earphone device adds the first cut-off signal and the second cut-off signal and outputs the first cut-off signal and the second cut-off signal by adopting a loudspeaker of the earphone device. The specific implementation process of adding the two signals is not limited herein, and reference may be made to a conventional signal superposition method. In a specific embodiment, the earphone device may directly output the first truncated signal and the second truncated signal through a speaker after adding the first truncated signal and the second truncated signal, or may output the first truncated signal and the second truncated signal through a speaker after adding the first truncated signal and the second truncated signal and further processing the first truncated signal.
It can be understood that the first cut-off signal includes a first noise reduction signal for a first preset frequency band, does not include a signal of a second preset frequency band, the closed loop of the signal of the second preset frequency band in the first cut-off signal is blocked, and no water bed effect is generated, and the second cut-off signal includes only the signal of the second preset frequency band, so that the signal of the second preset frequency band lacking in the first cut-off signal can be supplemented, and therefore, after the first cut-off signal and the second cut-off signal are added, the loudspeaker of the earphone device is adopted to output, the effect that the noise of the first preset frequency band is suppressed, and the noise of the second preset frequency band is not raised is achieved, namely, the generation of the water bed effect is avoided, and the experience of a user using the earphone is improved.
Further, the method further comprises:
Step S50, acquiring a feedforward signal picked up by a feedforward microphone in the earphone equipment;
when the active noise reduction mode in the earphone device is hybrid noise reduction, the earphone device may pick up a signal by a feedforward microphone, hereinafter referred to as a feedforward signal to show distinction. The feedforward microphone is generally disposed at a side of the earphone device housing structure, where the side contacts with the external environment, and is configured to receive an external environment noise signal.
Step S60, noise reduction processing is carried out on the feedforward signal, and a third noise reduction signal is obtained;
The headphone device performs noise reduction processing on the feedforward signal to obtain a noise reduction signal (hereinafter referred to as a third noise reduction signal to show distinction). The noise reduction processing for the feedforward signal may refer to the noise reduction processing procedure in feedforward noise reduction, and is not particularly limited herein.
Step S40 includes:
step S401, adding the first truncated signal, the second truncated signal and the third noise reduction signal, and outputting the added signals by using a speaker of the earphone device.
After obtaining the first cut-off signal, the second cut-off signal and the third noise reduction signal, the earphone device can add the three signals and output the three signals through a loudspeaker of the earphone device. The third noise reduction signal is used for counteracting external environment noise, the first cut-off signal and the second cut-off signal are used for counteracting external environment noise which is not completely counteracted by the third noise reduction signal, so that the noise reduction effect is improved, and the experience of a user in using the noise reduction earphone is improved.
In this embodiment, by dividing the signal picked up by the feedback microphone of the earphone device into two paths, performing noise reduction processing on the first path of signal aiming at the first preset frequency band, and performing amplitude zero setting on the second preset frequency band portion to obtain a first cut-off signal, so as to block the closed loop process of the second preset frequency band while performing noise reduction on the first preset frequency band in the first path of signal, and avoid the second preset frequency band portion from being raised due to the suppression of the first preset frequency band; and the amplitude of the frequency band part outside the second preset frequency band is set to zero based on the second path of signals, so that a second cut-off signal is obtained, the signals of the second preset frequency band part which are absent in the first cut-off signal are supplemented through the second cut-off signal, and the first cut-off signal and the second cut-off signal are added and then played through a loudspeaker, so that the noise suppression on the first preset frequency band is finally realized, the generation of a water bed effect is avoided, and the experience of a user using the earphone is improved.
Further, based on the above first embodiment, a second embodiment of the earphone noise reduction method of the present invention is proposed, in which step S30 includes:
Step S301, performing noise reduction processing on a second preset frequency band portion of the second path signal to obtain a second noise reduction signal, and performing amplitude zero setting on a frequency band portion outside the second preset frequency band in the second noise reduction signal to obtain a second truncated signal.
In order to further implement noise suppression on the first preset frequency band and also enable noise suppression on the second preset frequency band, in this embodiment, when performing amplitude zeroing processing on a frequency band portion other than the second preset frequency band based on the second path signal, specifically, noise reduction processing may be performed on the second preset frequency band portion of the second path signal to obtain a noise reduction signal (hereinafter referred to as a second noise reduction signal), and then amplitude zeroing is performed on the frequency band portion other than the second preset frequency band in the second noise reduction signal to obtain a second cut-off signal. It should be noted that, performing the noise reduction process on the second preset frequency band portion of the second signal may cause the raising of the signal in the portion (for example, the first preset frequency band) other than the second preset frequency band in the second signal, but after the second noise reduction signal is obtained, the amplitude of the frequency band portion other than the second preset frequency band in the second noise reduction signal is set to zero, so that the closed loop process of the frequency band other than the second preset frequency band is cut off in the second signal, and therefore, the water bed effect is not generated.
It can be understood that the first cut-off signal includes a first noise reduction signal for a first preset frequency band, does not include a signal of a second preset frequency band, a closed loop of the signal of the second preset frequency band in the first cut-off signal is blocked without generating a water bed effect, and the second cut-off signal includes a signal of the second noise reduction signal for the second preset frequency band, does not include a signal of a frequency band other than the second preset frequency band, and can supplement a signal of the second preset frequency band which is absent in the first cut-off signal and simultaneously achieve a suppression effect on noise of the second preset frequency band.
Further, based on the first and/or second embodiments, a third embodiment of the earphone noise reduction method of the present invention is provided, in which step S20 includes:
step S201, framing and windowing processing is carried out on a first path of signals to obtain first path of framing signals, and the first path of framing signals are converted from a time domain to a frequency domain to obtain first path of frequency domain signals;
When the earphone device processes the first path of signals, in order to achieve the effect of more real-time processing, the first path of signals can be subjected to framing and windowing processing to obtain framing signals with a period of time (hereinafter referred to as first path framing signals). The duration span of the first framing signal of a frame can be set according to the needs, for example, the real-time requirement is higher, and the duration span can be set to be shorter. In one embodiment, to reduce spectral leakage due to truncation effects, non-rectangular windows, such as hanning windows, hamming windows, etc., may be added during windowing.
After the first channel framing signal is obtained, the earphone equipment performs time domain to frequency domain conversion on the first channel framing signal to obtain a first channel frequency domain signal so as to facilitate subsequent noise reduction and amplitude zero setting. The conversion of the first framing signal to the frequency domain may use short-time fourier transform, which is not limited herein.
Step S202, performing noise reduction processing on a first preset frequency band part of a first path of frequency domain signal to obtain a first noise reduction signal, and performing amplitude zero setting on a second preset frequency band part in the first noise reduction signal to obtain a first cut-off signal;
After the earphone device obtains the first path of frequency domain signal, noise reduction processing can be performed on a first preset frequency band part of the first path of frequency domain signal to obtain a first noise reduction signal, and then amplitude setting is performed on a second preset frequency band part in the first noise reduction signal to obtain a first cut-off signal. It can be understood that after the signal is converted to the frequency domain, the noise reduction processing and the amplitude zero setting processing are more facilitated for a part of frequency bands.
Step S30 includes:
step S302, framing and windowing are carried out on the second path of signals to obtain second path of framing signals, and the second path of framing signals are converted from a time domain to a frequency domain to obtain second path of frequency domain signals;
the earphone device may also perform framing and windowing processing on the second channel signal to obtain a framing signal (hereinafter referred to as a second channel framing signal to show distinction). The visual spans of the first and second signals are set the same for framing and windowing so that the two signals can be aligned when added.
After the earphone device obtains the second channel framing signal, the second channel framing signal can be converted from the time domain to the frequency domain, so that the second channel frequency domain signal is obtained, and the amplitude zero setting process can be conveniently carried out subsequently.
Step S303, performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on the second path of frequency domain signals to obtain second cut-off signals;
After obtaining the second path of frequency domain signals, the earphone device can perform amplitude zero setting processing on frequency band parts outside a second preset frequency band based on the second path of frequency domain signals to obtain second cut-off signals. In a specific embodiment, the amplitude of the frequency band part outside the second preset frequency band in the second path of frequency domain signal may be set to zero directly to obtain the second truncated signal, or the amplitude of the part of the frequency band outside the second preset frequency band in the second path of frequency domain signal may be set to zero after the second noise reduction processing is performed on the second preset frequency band in the second path of frequency domain signal to obtain the second noise reduction signal, so as to obtain the second truncated signal. Step S40 includes:
Step S402, the first truncated signal and the second truncated signal are added and then converted from the frequency domain to the time domain, and then outputted by a speaker of the earphone device.
Since the processing is performed on the first path of frequency domain signal in the frequency domain, the obtained first cut-off signal is also in the frequency domain, and the second cut-off signal is also in the frequency domain. After the first truncated signal and the second truncated signal are added, the frequency domain needs to be converted into the time domain, and then the output of the speaker of the earphone device is adopted.
Further, in an embodiment, the step of performing frame windowing processing on the first path of signal in step S201 to obtain a first path of frame signal includes:
in step S2011, a non-rectangular window is used to perform frame-dividing and windowing processing on the first path of signals, so as to obtain first path of frame-dividing signals.
To reduce spectral leakage due to truncation effects, non-rectangular windows, such as hanning windows, hamming windows, etc., may be added during the windowing. Further, in an embodiment, to reduce a range side lobe of a time domain after pulse compression, a hanning window may be used to perform frame windowing processing on the first path of signal, so as to obtain a first path of frame signal. Similarly, in an embodiment, a hanning window may be used to perform frame windowing on the second channel signal to obtain a second channel frame signal.
Further, in an embodiment, step S40 includes:
Step S403, adding the first truncated signal and the second truncated signal to obtain a mixed signal;
Step S404, adopting a recursive minimum average algorithm to carry out noise tracking on the mixed signal so as to obtain a secondary noise reduction signal;
step S405, a speaker of the earphone device is used to output a secondary noise reduction signal.
In order to avoid that additional noise is introduced after the two paths of signals are added, the earphone device can track the noise after adding the first cut-off signal and the second cut-off signal, so as to perform secondary noise reduction and further improve the noise reduction effect. Specifically, a signal obtained by adding the first truncated signal and the second truncated signal is called a mixed signal, and a recursive minimum average algorithm is adopted to carry out noise tracking on the mixed signal so as to obtain a secondary noise reduction signal. The specific process of noise tracking the signal by the recursive least average algorithm may refer to a conventional noise tracking process, and is not limited herein. The earphone device adopts the loudspeaker to output the secondary noise reduction signal, so that the noise reduction effect of the active noise reduction of the earphone device can be further improved, and the use experience of a user is improved.
In addition, an embodiment of the present invention further provides an earphone noise reduction device, where the device is disposed in an earphone device, and referring to fig. 2, the device includes:
The branching module 10 is configured to branch a signal picked up by the feedback microphone in the earphone device to obtain a first path of signal and a second path of signal;
The first cut-off module 20 is configured to perform noise reduction processing on a first preset frequency band portion of the first path signal to obtain a first noise reduction signal, and perform amplitude zero setting on a second preset frequency band portion in the first noise reduction signal to obtain a first cut-off signal;
A second cut-off module 30, configured to perform, based on the second signal, an amplitude zero setting process for a frequency band portion outside the second preset frequency band, to obtain a second cut-off signal;
And an output module 40, configured to add the first truncated signal and the second truncated signal and output the first truncated signal through a speaker of the earphone device.
Further, the second truncation module 30 is further configured to:
And carrying out noise reduction processing on a second preset frequency band part of the second path of signal to obtain a second noise reduction signal, and carrying out amplitude zero setting on a frequency band part outside the second preset frequency band in the second noise reduction signal to obtain a second cut-off signal.
Further, the first truncation module 20 is further configured to:
Carrying out framing and windowing processing on the first path of signals to obtain first path of framing signals, and converting the first path of framing signals from a time domain to a frequency domain to obtain first path of frequency domain signals;
Noise reduction processing is carried out on a first preset frequency band part of the first path of frequency domain signals to obtain first noise reduction signals, and amplitude zero setting is carried out on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals;
The second truncation module 30 is further configured to:
carrying out framing and windowing processing on the second channel of signals to obtain second channel of framing signals, and converting the second channel of framing signals from a time domain to a frequency domain to obtain second channel of frequency domain signals;
Performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on the second path of frequency domain signals to obtain a second cut-off signal;
The output module 40 is also for:
The first truncated signal and the second truncated signal are added and then converted from a frequency domain to a time domain, and then output by a loudspeaker of the earphone device.
Further, the first truncation module 20 is further configured to:
And carrying out framing and windowing processing on the first path of signals by adopting a non-rectangular window to obtain first path of framing signals.
Further, the output module 40 is further configured to:
adding the first truncated signal and the second truncated signal to obtain a mixed signal;
Carrying out noise tracking on the mixed signal by adopting a recursive minimum average algorithm to obtain a secondary noise reduction signal;
a speaker of the earphone device is used for outputting a secondary noise reduction signal.
Further, the apparatus further comprises:
the acquisition module is used for acquiring a feedforward signal picked up by a feedforward microphone in the earphone equipment;
The noise reduction module is used for carrying out noise reduction processing on the feedforward signal to obtain a third noise reduction signal;
The output module 40 is also for:
and adding the first cut-off signal, the second cut-off signal and the third noise reduction signal, and outputting the added signals by adopting a loudspeaker of the earphone device.
Further, the first truncation module 20 is further configured to:
acquiring a noise reduction frequency band and a noise reduction grade which are set in the earphone equipment, and taking the noise reduction frequency band as a first preset frequency band;
performing noise reduction processing on a first preset frequency band part of the first path of signals according to the noise reduction level to obtain first noise reduction signals;
The apparatus further comprises:
The determining module is used for taking the frequency band outside the first preset frequency band as a second preset frequency band.
The expansion content of the specific implementation mode of the earphone noise reduction device is basically the same as that of each embodiment of the earphone noise reduction method, and the details are not repeated here.
The earphone equipment comprises a structural shell, a communication module, a main control module (such as a micro control unit MCU), a loudspeaker, a microphone, a memory and the like. The main control module can comprise a microprocessor, an audio decoding unit, a power supply and power supply management unit, sensors and other active or passive devices required by the system and the like (can be replaced, deleted or added according to actual functions) so as to realize the functions of receiving and playing wireless audio. The earphone device can establish communication connection with the user terminal through the communication module. The earphone noise reduction program can be stored in the memory of the earphone, and the microprocessor can be used for calling the earphone noise reduction program stored in the memory and executing the following operations:
branching signals picked up by a feedback microphone in the earphone equipment to obtain a first path of signals and a second path of signals;
noise reduction processing is carried out on a first preset frequency band part of the first path of signals to obtain first noise reduction signals, and amplitude zero setting is carried out on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals;
Performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on the second path of signals to obtain a second cut-off signal;
and adding the first cut-off signal and the second cut-off signal, and outputting the added signals by adopting a loudspeaker of the earphone device.
Further, performing an amplitude zero setting process for a frequency band part outside a second preset frequency band based on the second path signal, and obtaining a second truncated signal includes:
And carrying out noise reduction processing on a second preset frequency band part of the second path of signal to obtain a second noise reduction signal, and carrying out amplitude zero setting on a frequency band part outside the second preset frequency band in the second noise reduction signal to obtain a second cut-off signal.
Further, performing noise reduction processing on a first preset frequency band part of the first path of signal to obtain a first noise reduction signal, and performing amplitude zero setting on a second preset frequency band part in the first noise reduction signal to obtain a first cut-off signal, wherein the operation of obtaining the first cut-off signal comprises the following steps:
Carrying out framing and windowing processing on the first path of signals to obtain first path of framing signals, and converting the first path of framing signals from a time domain to a frequency domain to obtain first path of frequency domain signals;
Noise reduction processing is carried out on a first preset frequency band part of the first path of frequency domain signals to obtain first noise reduction signals, and amplitude zero setting is carried out on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals;
performing amplitude zero setting processing for a frequency band part outside a second preset frequency band based on a second path of signal, and obtaining a second truncated signal comprises the following steps:
carrying out framing and windowing processing on the second channel of signals to obtain second channel of framing signals, and converting the second channel of framing signals from a time domain to a frequency domain to obtain second channel of frequency domain signals;
Performing amplitude zero setting processing on a frequency band part outside a second preset frequency band based on the second path of frequency domain signals to obtain a second cut-off signal;
the operation of adding the first cut-off signal and the second cut-off signal and then outputting the added signals by using a speaker of the earphone device includes:
The first truncated signal and the second truncated signal are added and then converted from a frequency domain to a time domain, and then output by a loudspeaker of the earphone device.
Further, the framing and windowing processing is performed on the first path of signals, and the operation of obtaining the first path of framing signals comprises the following steps:
And carrying out framing and windowing processing on the first path of signals by adopting a non-rectangular window to obtain first path of framing signals.
Further, the operation of adding the first cut-off signal and the second cut-off signal and then outputting the added first cut-off signal and the added second cut-off signal by using the speaker of the earphone device includes:
adding the first truncated signal and the second truncated signal to obtain a mixed signal;
Carrying out noise tracking on the mixed signal by adopting a recursive minimum average algorithm to obtain a secondary noise reduction signal;
a speaker of the earphone device is used for outputting a secondary noise reduction signal.
Further, the microprocessor may be further configured to invoke a headset noise reduction program stored in the memory to perform the following operations:
acquiring a feedforward signal picked up by a feedforward microphone in the earphone device;
Noise reduction processing is carried out on the feedforward signal to obtain a third noise reduction signal;
the operation of adding the first cut-off signal and the second cut-off signal and then outputting the added signals by using a speaker of the earphone device includes:
and adding the first cut-off signal, the second cut-off signal and the third noise reduction signal, and outputting the added signals by adopting a loudspeaker of the earphone device.
Further, the noise reduction processing is performed on the first preset frequency band part of the first path signal, and the operation of obtaining the first noise reduction signal includes:
acquiring a noise reduction frequency band and a noise reduction grade which are set in the earphone equipment, and taking the noise reduction frequency band as a first preset frequency band;
performing noise reduction processing on a first preset frequency band part of the first path of signals according to the noise reduction level to obtain first noise reduction signals;
The microprocessor may also be used to invoke a headset noise reduction program stored in the memory to perform the following operations:
and taking the frequency band outside the first preset frequency band as a second preset frequency band.
Embodiments of the earphone device and the computer readable storage medium of the present invention may refer to embodiments of the earphone noise reduction method of the present invention, and will not be described herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A method of noise reduction for headphones, the method being applied to a headphone device, the method comprising the steps of:
Branching signals picked up by a feedback microphone in the earphone equipment to obtain a first path of signals and a second path of signals, wherein the first path of signals and the second path of signals are identical;
Carrying out noise reduction processing on a first preset frequency band part of the first path of signals to obtain first noise reduction signals, and carrying out amplitude zero setting on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals, wherein the second preset frequency band is a frequency band part outside the first preset frequency band;
Performing amplitude zero setting processing on the frequency band parts outside the second preset frequency band based on the second path of signals to obtain a second cut-off signal;
Adding the first cut-off signal and the second cut-off signal, and outputting the added signals by adopting a loudspeaker of the earphone device;
the step of performing noise reduction processing on the first preset frequency band part of the first path of signal to obtain a first noise reduction signal includes:
and acquiring a noise reduction frequency band set in the earphone equipment, and taking the noise reduction frequency band as the first preset frequency band.
2. The method for noise reduction of headphones as defined in claim 1, wherein the step of performing amplitude zero processing for the frequency band portion outside the second preset frequency band based on the second path signal to obtain a second truncated signal comprises:
and carrying out noise reduction processing on the second preset frequency band part of the second path of signal to obtain a second noise reduction signal, and carrying out amplitude zero setting on the frequency band part outside the second preset frequency band in the second noise reduction signal to obtain a second cut-off signal.
3. The method for noise reduction of headphones as set forth in claim 1, wherein the step of performing noise reduction processing on a first preset frequency band portion of the first path signal to obtain a first noise reduction signal, and performing amplitude zero setting on a second preset frequency band portion in the first noise reduction signal to obtain a first truncated signal includes:
Carrying out framing and windowing processing on the first path of signals to obtain first path of framing signals, and converting the first path of framing signals from a time domain to a frequency domain to obtain first path of frequency domain signals;
Carrying out noise reduction processing on a first preset frequency band part of the first path of frequency domain signals to obtain first noise reduction signals, and carrying out amplitude zero setting on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals;
the step of performing the amplitude zero setting processing for the frequency band part outside the second preset frequency band based on the second path signal to obtain a second truncated signal includes:
carrying out framing and windowing processing on the second path of signals to obtain second path of framing signals, and converting the second path of framing signals from a time domain to a frequency domain to obtain second path of frequency domain signals;
Performing amplitude zero setting processing on the frequency band part outside the second preset frequency band based on the second path of frequency domain signals to obtain a second cut-off signal;
The step of adding the first cut-off signal and the second cut-off signal and adopting a speaker of the earphone device to output includes:
and adding the first truncated signal and the second truncated signal, converting the first truncated signal from a frequency domain to a time domain, and outputting by adopting a loudspeaker of the earphone device.
4. The method for noise reduction of headphones as set forth in claim 3, wherein the step of performing frame windowing on the first path of signal to obtain a first path of frame signal comprises:
and carrying out framing windowing processing on the first path of signals by adopting a non-rectangular window to obtain first path of framing signals.
5. The method of earphone noise reduction according to claim 1, wherein the step of adding the first cut-off signal and the second cut-off signal and then employing a speaker output of the earphone device includes:
adding the first truncated signal and the second truncated signal to obtain a mixed signal;
Carrying out noise tracking on the mixed signal by adopting a recursive minimum average algorithm to obtain a secondary noise reduction signal;
And outputting the secondary noise reduction signal by adopting a loudspeaker of the earphone device.
6. The earphone noise reduction method according to claim 1, wherein the method further comprises:
Acquiring a feedforward signal picked up by a feedforward microphone in the earphone equipment;
noise reduction processing is carried out on the feedforward signal to obtain a third noise reduction signal;
The step of adding the first cut-off signal and the second cut-off signal and adopting a speaker of the earphone device to output includes:
And adding the first cut-off signal, the second cut-off signal and the third noise reduction signal, and outputting the added signals by adopting a loudspeaker of the earphone device.
7. The method for noise reduction of headphones according to any one of claims 1 to 6, wherein the step of performing noise reduction processing on the first preset frequency band portion of the first path signal to obtain a first noise reduction signal includes:
obtaining a noise reduction level set in the earphone equipment;
And carrying out noise reduction processing on the first preset frequency band part of the first path of signal according to the noise reduction level to obtain a first noise reduction signal.
8. A headset noise reduction device, the device being deployed in a headset apparatus, the device comprising:
The branching module is used for branching signals picked up by the feedback microphone in the earphone equipment to obtain a first path of signals and a second path of signals, and the first path of signals and the second path of signals are identical;
The first cut-off module is used for carrying out noise reduction processing on a first preset frequency band part of the first path of signals to obtain first noise reduction signals, carrying out amplitude zero setting on a second preset frequency band part in the first noise reduction signals to obtain first cut-off signals, wherein the second preset frequency band is a frequency band part outside the first preset frequency band part;
The second cut-off module is used for carrying out amplitude zero setting processing on the frequency band parts outside the second preset frequency band based on the second path of signals to obtain second cut-off signals;
The output module is used for outputting the first truncated signal and the second truncated signal by adopting a loudspeaker of the earphone device after adding the first truncated signal and the second truncated signal;
the first cut-off module is further configured to obtain a noise reduction frequency band set in the earphone device, and take the noise reduction frequency band as the first preset frequency band.
9. A headset device, characterized in that the headset device comprises: memory, a processor and a headset noise reduction program stored on the memory and executable on the processor, which headset noise reduction program when executed by the processor implements the steps of the headset noise reduction method of any of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a headset noise reduction program, which when executed by a processor, implements the steps of the headset noise reduction method of any of claims 1 to 7.
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| FR2983026A1 (en) * | 2011-11-22 | 2013-05-24 | Parrot | AUDIO HELMET WITH ACTIVE NON-ADAPTIVE TYPE NOISE CONTROL FOR LISTENING TO AUDIO MUSIC SOURCE AND / OR HANDS-FREE TELEPHONE FUNCTIONS |
| US9208773B2 (en) * | 2011-12-23 | 2015-12-08 | Bose Corporation | Headset noise-based pulsed attenuation |
| GB2506908B (en) * | 2012-10-12 | 2015-01-21 | Wolfson Microelectronics Plc | Noise cancellation |
| JP5630538B2 (en) * | 2013-07-01 | 2014-11-26 | ソニー株式会社 | Noise canceling system |
| FR3019961A1 (en) * | 2014-04-11 | 2015-10-16 | Parrot | AUDIO HEADSET WITH ANC ACTIVE NOISE CONTROL WITH REDUCTION OF THE ELECTRICAL BREATH |
| FR3021180B1 (en) * | 2014-05-16 | 2016-06-03 | Parrot | AUDIO ACTIVE ANC CONTROL AUDIO HELMET WITH PREVENTION OF THE EFFECTS OF A SATURATION OF THE MICROPHONE SIGNAL "FEEDBACK" |
| CN108882092A (en) * | 2018-07-03 | 2018-11-23 | 歌尔智能科技有限公司 | A kind of earphone noise-reduction method and feedback noise reduction system |
| CN108882094B (en) * | 2018-07-27 | 2020-03-13 | 歌尔科技有限公司 | Feedback noise reduction earphone and feedback circuit thereof |
| CN109040889B (en) * | 2018-07-27 | 2020-01-10 | 歌尔科技有限公司 | Feedback noise reduction earphone and feedback circuit thereof |
| CN113643682B (en) * | 2021-10-13 | 2022-07-15 | 展讯通信（上海）有限公司 | Noise reduction method, chip module and equipment |
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