CN108235818A - Active denoising method, equipment and earphone - Google Patents
Active denoising method, equipment and earphone Download PDFInfo
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- CN108235818A CN108235818A CN201880000003.1A CN201880000003A CN108235818A CN 108235818 A CN108235818 A CN 108235818A CN 201880000003 A CN201880000003 A CN 201880000003A CN 108235818 A CN108235818 A CN 108235818A
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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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Abstract
A kind of active denoising method, the noise in cavity formed for reducing housing and body-coupled, including：Obtain the first noise information in cavity.First noise information is divided into the noise information of the frequency band of at least two non-overlapping copies according to predeterminated frequency section.According to the noise information of the frequency band of non-overlapping copies, adjustment respectively is made an uproar parameter corresponding at least two filters of the noise information of the frequency band of non-overlapping copies.Obtain the second noise information outside cavity.It receives and is made an uproar parameter according at least two filters after adjustment, handle the second noise information, to export the audio data with noise reduction.It is made an uproar parameter by first setting a filter substantially, then parameter of making an uproar when in use to the filter carries out feedback modifiers, it is the blanket a large amount of calculating for filtering parameter of making an uproar of acquisition so as to save early period, can be also directed to different use environments and carry out adaptability amendment, improve and filter adaptability of the parameter to varying environment of making an uproar.
Description
Technical Field
The invention relates to the technical field of noise reduction, in particular to an active noise reduction device, an earphone and an active noise reduction method.
Background
In real life, when a user wears the earphone, the shell of the earphone is coupled with a human body to form a cavity. On the one hand, in external noise accessible casing propagated into the cavity, the casing had certain filtering action to external noise, along with the shape of casing and the difference of material, the filtering action to external noise is also different. On the other hand, external noise can also leak into the cavity through the gap between the shell and the human ear, along with the difference of the coupling degree of the shell and the human body, the degree of the external noise leaking into the cavity is different, and the closer the coupling degree of the shell and the human body is, the less the noise leaking into the cavity is. Therefore, the noise heard by the human ear is not equal to the external noise, and actually the external noise is heard and is transmitted through the shell or leaked into the cavity through the gap. Therefore, the numerical value of the noise filtering parameter in the active noise reduction technology can be deduced according to the conditions of external noise, the material of the shell, the shape of the shell, the coupling degree of the shell and a human body and the like. In the conventional technology, the process of acquiring the commonly applicable noise filtering parameters is complicated in calculation and poor in noise filtering effect.
Disclosure of Invention
Therefore, it is necessary to provide an active noise reduction method based on feedback adjustment for solving the problem of poor noise filtering effect of the noise filtering parameters.
In addition, an active noise reduction device and an earphone are also provided.
An active noise reduction method for reducing noise in a cavity formed by coupling a shell and a human body, comprising the following steps:
first noise information within the cavity is obtained.
And dividing the first noise information into noise information of at least two frequency bands which are not overlapped with each other according to a preset frequency band.
And respectively adjusting at least two noise filtering parameters corresponding to the noise information of the frequency bands which do not overlap with each other according to the noise information of the frequency bands which do not overlap with each other.
Second noise information outside the cavity is obtained.
And receiving and processing the second noise information according to the adjusted at least two noise filtering parameters to output audio data with noise reduction effect.
In one embodiment, the step of dividing the first noise information into noise information of at least two non-overlapping frequency bands according to a predetermined frequency band comprises:
the first noise information is divided into at least two noise information of frequency bands which are not overlapped with each other by at least two frequency division filters.
In one embodiment, the step of adjusting at least two noise filtering parameters corresponding to the noise information of the frequency bands that do not overlap with each other according to the noise information of the frequency bands that do not overlap with each other includes:
and adjusting at least two noise filtering parameters according to the noise information of the frequency bands which do not overlap with each other by a control module connected with at least two frequency division filters.
In one embodiment, the step of receiving and processing the second noise information according to the adjusted at least two noise filtering parameters to output audio data with noise reduction effect includes:
and receiving and correspondingly processing the second noise information according to the at least two noise filtering parameters through at least two processing filters connected with the control module so as to output the audio data with the noise reduction effect.
In one embodiment, the step of dividing the first noise information into noise information of at least two non-overlapping frequency bands according to a predetermined frequency band comprises:
and sequentially separating the first noise information into the noise information of at least two non-overlapping frequency sections according to the preset frequency section.
In one embodiment, the step of adjusting at least two noise filtering parameters corresponding to the noise information of at least two non-overlapping frequency bands respectively according to the noise information of at least two non-overlapping frequency bands comprises:
and respectively and sequentially adjusting at least two noise filtering parameters of the noise information corresponding to the at least two non-overlapping frequency bands according to the noise information of the at least two non-overlapping frequency bands according to time sequence.
In one embodiment, the step of receiving and processing the second noise information according to the adjusted at least two noise filtering parameters includes:
and receiving and processing the second noise information according to the adjusted at least two noise filtering parameters in time sequence.
In one embodiment, before the step of acquiring the first noise information in the cavity, the method further includes:
receiving digital audio signals intermittently generated by an external device.
And detecting whether the digital audio signal is received or not, and executing the step of acquiring the first noise information in the cavity when the digital audio signal is not received. And when the digital audio signal is received, suspending the step of acquiring the first noise information in the cavity.
In one embodiment, whether the digital audio signal is received or not is detected, and when the digital audio signal is not received, the step of acquiring the first noise information in the cavity is executed. When receiving the digital audio signal, suspend the step of obtaining the first noise information in the cavity, including:
whether a digital code stream of the digital audio signal is received or not is detected to judge whether the digital audio signal is received or not.
An active noise reduction device comprising:
the shell is used for being coupled with a human body to form a cavity.
The first sensor is used for acquiring first noise information in the cavity.
And the frequency division module is electrically connected with the first sensor and is used for dividing the first noise information into noise information of at least two non-overlapping frequency bands according to a preset frequency band.
And the control module is connected with the frequency division module and used for respectively adjusting at least two noise filtering parameters corresponding to the noise information of at least two non-overlapping frequency bands according to the noise information of at least two non-overlapping frequency bands.
And the second sensor is used for acquiring second noise information outside the cavity.
And the audio processing module is respectively connected with the control module and the second sensor and is used for receiving and processing the second noise information according to the adjusted at least two noise filtering parameters so as to output audio data with the noise reduction effect.
In one embodiment, the frequency division module comprises at least two frequency division filters corresponding to at least two frequency segments that do not overlap with each other.
In one embodiment, the audio processing module comprises at least two processing filters connected to the control module. The processing filter is used for processing the second noise information.
In one embodiment, the frequency division module is configured to sequentially divide the first noise information into the noise information of at least two non-overlapping frequency segments according to a preset frequency segment.
In one embodiment, the control module is configured to sequentially adjust at least two noise filtering parameters corresponding to the noise information of the at least two non-overlapping frequency segments according to time sequence according to the noise information of the at least two non-overlapping frequency segments.
In one embodiment, the audio processing module is configured to receive and process the second noise information according to the adjusted at least two noise filtering parameters in time sequence, so as to output audio data with a noise reduction effect.
In one embodiment, the control module further comprises an audio signal input module connected with the control module. The audio signal input module is used for receiving digital audio signals intermittently generated by external equipment. Wherein,
when the control module detects that the audio signal input module does not receive the digital audio signal, the control module controls the frequency division module to work. When the control module detects that the audio signal input module receives the digital audio signal, the control module controls the frequency division module to pause.
In one embodiment, the control module further includes a digital code stream detection unit, and the digital code stream detection unit is configured to detect whether the audio signal input module receives a digital code stream of the digital audio signal, so as to determine whether the digital audio signal is received.
An active noise reducing headphone, comprising:
the shell is used for being coupled with a human body to form a cavity.
The first sensor is used for acquiring first noise information in the cavity.
And the frequency division module is electrically connected with the first sensor and is used for dividing the first noise information into noise information of at least two non-overlapping frequency bands according to a preset frequency band.
And the control module is connected with the frequency division module and used for respectively adjusting at least two noise filtering parameters corresponding to the noise information of the frequency bands which do not overlap with each other according to the noise information of the frequency bands which do not overlap with each other.
And the second sensor is used for acquiring second noise information outside the cavity.
And the audio processing module is respectively connected with the control module and the second sensor and is used for receiving and processing the second noise information according to the adjusted at least two noise filtering parameters so as to output audio data with the noise reduction effect.
In one embodiment, the headset comprises a headphone or an in-ear headphone.
According to the active noise reduction method, a rough noise filtering parameter is set firstly, and then the noise filtering parameter is subjected to feedback correction when in use, so that a large amount of calculation for obtaining the commonly applicable noise filtering parameter in the early stage is omitted, adaptability correction can be performed aiming at different use environments, and the adaptability of the noise filtering parameter to different environments is improved.
Drawings
FIG. 1 is a flow diagram of an active noise reduction method in one embodiment;
FIG. 2 is a flow diagram of an active noise reduction method in one embodiment;
FIG. 3 is a flow diagram of an active noise reduction method in one embodiment;
FIG. 4 is a flow diagram of an active noise reduction method in one embodiment;
FIG. 5 is a functional block diagram of an active noise reduction device in one embodiment;
fig. 6 is a schematic structural diagram of an active noise reduction device in an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As shown in fig. 1, an active noise reduction method may specifically include the following steps:
step S100: first noise information within the cavity is obtained.
Step S200: and dividing the first noise information into noise information of at least two frequency bands which are not overlapped with each other according to a preset frequency band.
Step S300: and respectively adjusting at least two noise filtering parameters corresponding to the noise information of the frequency bands which do not overlap with each other according to the noise information of the frequency bands which do not overlap with each other.
Step S400: second noise information outside the cavity is obtained.
Step S500: and receiving and processing the second noise information according to the adjusted at least two noise filtering parameters to output audio data with noise reduction effect.
According to the active noise reduction method, a rough noise filtering parameter is set firstly, and then the noise filtering parameter is subjected to feedback correction when in use, so that a large amount of calculation for obtaining the commonly applicable noise filtering parameter in the early stage is omitted, adaptability correction can be performed aiming at different use environments, and the adaptability of the noise filtering parameter to different environments is improved.
Step S100: first noise information within the cavity is obtained.
The first noise information in the cavity includes frequency, phase, amplitude, etc. of the noise. First noise information within the cavity may be acquired by a feedback microphone disposed within the cavity. Preferably, the feedback microphone can be arranged at a position close to the driver generating the phase-inversion noise, so as to receive the noise in the cavity around the driver to the maximum extent, thereby better restoring the noise information around the driver, and enabling the phase-inversion noise generated by the driver to more accurately offset the noise in the cavity.
Step S200: and dividing the first noise information into noise information of at least two frequency bands which are not overlapped with each other according to a preset frequency band.
Dividing a full frequency band or a certain frequency band into a plurality of preset frequency bands through a frequency division point, wherein the frequency bands are not overlapped with each other. The setting of the frequency dividing point is not limited, and the frequency dividing point can be selectively set according to the frequency band distribution of the second noise information.
In one embodiment, the frequency bands in which noise is concentrated and distributed can be selected to be concentrated and distributed with frequency dividing points, and the rest frequency bands are less distributed with frequency dividing points or even not distributed with frequency dividing points, so that components are saved, and the active noise reduction effect is not influenced. For example, 4KHz, 2KHz, 1KHz, 500Hz are used as preset frequency dividing points, and the preset frequency division points can be divided into preset frequency bands of 4KHz-2KHz, 2KHz-1KHz, 1KHz-500 Hz. If the noise is intensively distributed on the frequency band of 4KHz-1KHz, the frequency division point of 500Hz can be omitted, the newly set frequency division points are 4KHz, 2KHz and 1KHz, and the corresponding new preset frequency band is 4KHz-2KHz and 2KHz-1 KHz. Therefore, a frequency division filter corresponding to a frequency section of 1KHz-500Hz can be omitted, and the purpose of saving components is achieved.
In one embodiment, the low-frequency band is selected as the preset frequency band, because the shell is made of sound insulation materials, the middle-high frequency noise of the environment can be isolated to a great extent, and the first noise transmitted to the cavity formed by coupling the human ear and the earphone is mainly low-frequency noise which is difficult to filter by the sound insulation materials, so that the active noise reduction device can selectively perform noise reduction processing on the low-frequency noise, thereby saving a frequency division filter, reducing the calculation amount during noise filtering parameter adjustment and improving the detection speed of the detection device.
Preferably, the preset frequency dividing point can be selected from 8KHz, 4KHz, 2KHz, 1KHz, 750Hz, 500Hz, 250Hz and 125 Hz. Thereby dividing the first noise information into 8 non-overlapping frequency bins.
In one embodiment, as shown in FIG. 2, step S200 includes step S210: the first noise information is divided into at least two noise information of frequency bands which are not overlapped with each other by at least two frequency division filters.
In one embodiment, if the preset frequency division point selects 8KHz, 4KHz, 2KHz, 1KHz, 750Hz, 500Hz, 250Hz, and 125Hz, the first noise information is divided into 8 non-overlapping frequency bands by corresponding 8 frequency division filters.
In one embodiment, as shown in FIG. 3, step S200 includes step S220: and sequentially separating the first noise information into the noise information of at least two non-overlapping frequency sections according to the preset frequency section.
The process of sequentially separating the noise information of different frequency segments according to time sequence may be sequentially separating the noise information of each preset frequency segment according to a preset sequence. The preset sequence can be from a low frequency band to a high frequency band, or from the high frequency band to the low frequency band, or can perform frequency division according to a random sequence. For example, first, noise information in a frequency band of 4KHz to 2KHz in the first noise information is separated, and a frequency division result is pushed to a corresponding device. Then, noise information of a 2KHz-1KHz frequency range in the first noise information is separated, a frequency division result is pushed to a corresponding device, then, noise information of a 1KHz-500Hz frequency range in the first noise information is separated, and a detection result is pushed to the corresponding device. The calculation amount in the same time period can be reduced by sequentially separating the noise information of each frequency band, and the quick response of the active noise reduction process is facilitated. The reduction of the calculation amount also helps to reduce the number of components and reduces the cost.
Step S300: and respectively adjusting at least two noise filtering parameters corresponding to the noise information of the frequency bands which do not overlap with each other according to the noise information of the frequency bands which do not overlap with each other.
In an embodiment, the correspondence between the noise filtering parameters and the separated noise information of the frequency segments that do not overlap with each other may be a one-to-one correspondence, or the noise information of a plurality of frequency segments may correspond to one noise filtering parameter, or the noise information of one frequency segment may correspond to a plurality of noise filtering parameters.
In one embodiment, as shown in FIG. 2, step S300 includes step S310: and adjusting at least two noise filtering parameters according to the noise information of the frequency bands which do not overlap with each other by a control module connected with at least two frequency division filters.
The noise filtering parameter includes a filter coefficient of the processing filter. In one embodiment, the filter coefficients of the 5 processing filters may be adjusted according to the noise information of the 5 non-overlapping frequency bands separated by the 5 frequency division filters. And the filter coefficients of 3 or 5 processing filters can be correspondingly adjusted according to the noise information of 8 non-overlapping frequency bands separated by 8 frequency division filters.
In one embodiment, as shown in FIG. 3, step S300 includes step S320: and respectively and sequentially adjusting at least two noise filtering parameters of the noise information corresponding to the at least two non-overlapping frequency bands according to the noise information of the at least two non-overlapping frequency bands according to time sequence.
The noise filtering parameters can be adjusted in the same time period, and can also be adjusted in time sequence.
In one embodiment, the noise information separated first may be processed preferentially to improve the response speed of adjusting the noise filtering parameter. For example, after the noise information of the 4KHz-2KHz frequency segment in the first noise information is separated, the noise filtering parameter corresponding to the 4KHz-2KHz frequency segment is corrected according to the noise information. And then adjusting the noise filtering parameters corresponding to the 2KHz-1KHz frequency section according to the noise information of the 2KHz-1KHz frequency section in the separated first noise information. The response speed of the noise filtering parameter adjusting process is improved by carrying out priority processing on the noise information detected in advance.
Step S400: second noise information outside the cavity is obtained.
The second noise information includes frequency, phase, amplitude, etc. of the noise. The second noise information may be acquired by a feedforward microphone disposed outside the cavity. Preferably, the feedforward microphone may be located at a distance from the driver generating the opposite-phase noise to avoid interference with the opposite-phase noise emitted from the driver when acquiring the second noise information.
Step S500: and receiving and processing the second noise information according to the adjusted at least two noise filtering parameters to output audio data with noise reduction effect.
And processing the second noise information according to the noise filtering parameters to generate audio data with noise reduction effect, and driving a driver positioned in the cavity to generate an opposite-phase noise sound wave with a phase difference of 180 degrees with the first noise sound wave in the cavity through the audio data to neutralize the first noise in the cavity, thereby achieving the purpose of active noise reduction. The driver may be a speaker, and specifically may be a moving coil speaker, a pneumatic speaker, an electromagnetic speaker, or the like.
In one embodiment, as shown in FIG. 2, step S500 includes step S510: and receiving and correspondingly processing the second noise information according to the at least two noise filtering parameters through at least two processing filters connected with the control module so as to output the audio data with the noise reduction effect.
The noise filtering parameters specifically correspond to the processing filters of the frequency bands, and the noise filtering parameters are adjusted by adjusting the filter coefficients of the processing filters. A plurality of processing filters corresponding to different noise filtering parameters may be provided, and the plurality of processing filters process the noise information of different frequency bands in the second noise information, respectively. For example, the noise filtering parameters may include a medium frequency noise filtering parameter and a low frequency noise filtering parameter. The medium-frequency noise filtering parameter corresponds to the filtering coefficient of the first processing filter, the low-frequency noise filtering parameter corresponds to the filtering coefficient of the second processing filter, the medium-frequency noise filtering parameter is adjusted by adjusting the filtering coefficient of the first processing filter, and the low-frequency noise filtering parameter is adjusted by adjusting the filtering coefficient of the second processing filter. At the moment, processing the low-frequency noise information in the second noise information according to the low-frequency noise filtering parameter to generate reversed-phase low-frequency noise; and processing the intermediate-frequency noise information in the second noise information according to the intermediate-frequency noise filtering parameter to generate reversed-phase intermediate-frequency noise. It should be noted that the noise filtering parameter may further include a high-frequency noise filtering parameter.
In one embodiment, as shown in FIG. 3, step S500 includes step S520: and receiving and processing the second noise information according to the adjusted at least two noise filtering parameters in time sequence.
In an embodiment, the sequentially adjusting according to time sequence may be sequentially adjusting noise filtering parameters corresponding to different frequency bands according to a preset sequence, where the preset sequence may be from a low frequency band to a high frequency band, or from the high frequency band to the low frequency band, or may be adjusted according to a random sequence.
In one embodiment, as shown in fig. 4, step S100 further includes, before:
step S610: receiving digital audio signals intermittently generated by an external device.
Step S620: it is detected whether a digital audio signal is received. When the digital audio signal is not received, executing the step of acquiring first noise information in the cavity; and when the digital audio signal is received, suspending the step of acquiring the first noise information in the cavity. As shown in fig. 4, step S620 further skips to the step of accepting the digital audio signal intermittently generated by the external device while suspending the execution of step S100, and continues to detect the digital audio signal in real time.
When a user listens to music through the earphone, external equipment such as a loudspeaker can play music in the cavity intermittently. If the first noise information in the cavity is acquired in the time period of playing music, the music information cannot be avoided being mixed, and at the moment, extra complex equipment is required to be added to filter the acquired music information. And through obtaining first noise information when not receiving digital audio signal (when not playing the music), can avoid increasing extra complicated equipment and filter audio information in the cavity that detects, practice thrift the cost.
In one embodiment, the detecting means may detect whether a digital stream of the digital audio signal is received to determine whether the digital audio signal is received. The digital code stream is a data stream formed by the digital codes of the digital audio signals, the audio frequency gap can be judged more accurately and rapidly by detecting the digital code stream, and the components and parts required by detection are simpler.
Based on the same inventive concept, an active noise reduction device is provided as follows. As shown in fig. 5, the active noise reduction apparatus includes:
a housing (not shown) for coupling with a human body to form a cavity.
The first sensor 610 is used for acquiring first noise information in the cavity.
And a frequency dividing module 620, electrically connected to the first sensor 610, for dividing the first noise information into noise information of at least two frequency bands that do not overlap with each other according to a preset frequency band.
And a control module 630, connected to the frequency dividing module 620, for adjusting at least two noise filtering parameters corresponding to the noise information of at least two non-overlapping frequency bands, respectively, according to the noise information of at least two non-overlapping frequency bands.
And a second sensor 640 for acquiring second noise information outside the cavity.
And the audio processing module 650 is respectively connected to the control module 630 and the second sensor 640, and is configured to receive and process the second noise information according to the adjusted at least two noise filtering parameters, so as to output audio data with a noise reduction effect.
The housing is part of an audio device such as a headset, the first sensor 610 may be a feedback microphone, and the second sensor 640 may be a feed-forward microphone. The processing steps of the frequency dividing module 620 can refer to step S200 of the above-described embodiment. The processing steps of the control module 630 can refer to steps S300 and S310 of the above embodiments. The processing steps of the audio processing module 650 can refer to step S500 of the above-described embodiment. And will not be described in detail herein.
In one embodiment, the crossover module 620 includes at least two crossover filters corresponding to at least two frequency bins that do not overlap with each other. The processing step of the crossover filter can refer to step S210 of the above-described embodiment.
In an embodiment, the frequency dividing module 620 is configured to sequentially divide the first noise information into noise information of at least two non-overlapping frequency segments according to a preset frequency segment. The processing step of the crossover filter can refer to step S220 of the above-described embodiment.
In an embodiment, the control module 630 is configured to sequentially adjust at least two noise filtering parameters corresponding to the noise information of the at least two non-overlapping frequency segments according to a time sequence according to the noise information of the at least two non-overlapping frequency segments. The processing steps of the control module 630 can refer to step S320 of the above-described embodiment.
In one embodiment, the audio processing module 650 includes at least two processing filters coupled to the control module 630. The processing filter is used for processing the second noise information. The processing step of processing the filter may refer to step S510 of the above-described embodiment.
In an embodiment, the audio processing module 650 is configured to receive and process the second noise information according to the adjusted at least two noise filtering parameters in time sequence to output audio data with noise reduction effect. The processing steps of the audio processing module 650 can refer to step S520 of the above-described embodiment.
In one embodiment, as shown in fig. 6, the active noise reduction apparatus includes a housing 710 for coupling with a human body to form a cavity, the housing 710 being part of an audio device such as a headphone or an in-ear headphone. A part of the noise outside the housing 710 leaks into the housing 710, the noise inside the housing 710 is referred to as a first noise, and the noise outside the housing 710 is referred to as a second noise. First sensor 720 is the feedback microphone, first sensor 720 acquires the first noise information in the cavity, first noise information transmits to frequency dividing module 730 through the form of audio stream 1, frequency dividing module 730 divides first noise information into the noise information of a plurality of non-overlapping frequency segments according to the preset frequency segment and then forms control flow 4 to transmit to control module 740, control module 740 receives and processes control flow 4 to adjust the noise filtering parameters of at least two different frequency segments, and the noise filtering parameters include filtering coefficients. The control module 740 then transmits the adjusted noise filtering parameter to the audio processing module 750 through the control stream 2, and the audio processing module 750 adjusts the filter coefficient of its own processing filter according to the adjusted noise filtering parameter, and the processing filter processes the second noise information acquired by the second sensor 760 to output the audio data with noise reduction effect to the driver 770. The driver 770 plays the audio data to generate noise reduction sound.
Further, the control module 740 is connected to an audio input module 780. The audio input module 780 intermittently inputs digital audio signals (e.g., a plurality of music audio signals are input, and a time gap exists between each music) to the frequency dividing module 730, which has a switching function and performs frequency dividing operation in each music gap. Specifically, the control module 740 is connected to the audio input module 780, and determines whether the current music gap is present by detecting the digital code stream (i.e. control stream 1) of the digital audio signal. Control block 740 generates control flow 3 according to control flow 1 to control the opening of divide block 730 at the music gap.
This equipment of making an uproar falls in initiative realizes on the basis of former noise reduction processing, obtains the still remaining first noise information in the cavity, and according to the noise parameter of filtering of the feedback adjustment of first noise information frequency division, the noise parameter of filtering after the adjustment can be used to eliminate remaining noise information, improves the accuracy of the processing of making an uproar falls in the initiative.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (19)
1. An active noise reduction method for reducing noise in a cavity formed by coupling a shell and a human body, comprising the following steps:
acquiring first noise information in the cavity;
dividing the first noise information into noise information of at least two non-overlapping frequency bands according to a preset frequency band;
respectively adjusting at least two noise filtering parameters corresponding to the noise information of the non-overlapping frequency bands according to the noise information of the non-overlapping frequency bands;
acquiring second noise information outside the cavity;
and receiving and processing the second noise information according to the adjusted at least two noise filtering parameters so as to output audio data with noise reduction effect.
2. The active noise reduction method according to claim 1, wherein the step of dividing the first noise information into noise information of at least two non-overlapping frequency bands according to a predetermined frequency band comprises:
and dividing the first noise information into at least two noise information of frequency bands which are not overlapped with each other through at least two frequency division filters.
3. The active noise reduction method according to claim 2, wherein the step of adjusting at least two noise filtering parameters corresponding to the noise information of the non-overlapping frequency bands respectively according to the noise information of the non-overlapping frequency bands comprises:
adjusting the at least two noise filtering parameters according to the noise information of the non-overlapping frequency bands by a control module connected with the at least two frequency division filters.
4. The active noise reduction method according to claim 3, wherein the step of receiving and processing the second noise information according to the adjusted at least two noise filtering parameters to output audio data with noise reduction effect comprises:
and receiving and correspondingly processing the second noise information according to the at least two noise filtering parameters through at least two processing filters connected with the control module so as to output audio data with noise reduction effect.
5. The active noise reduction method according to claim 1, wherein the step of dividing the first noise information into noise information of at least two non-overlapping frequency bands according to a predetermined frequency band comprises:
and sequentially separating the first noise information into the noise information of at least two non-overlapping frequency sections according to a preset frequency section.
6. The active noise reduction method according to claim 1, wherein the step of adjusting at least two noise filtering parameters corresponding to the noise information of the at least two non-overlapping frequency bins according to the noise information of the at least two non-overlapping frequency bins comprises:
and respectively adjusting at least two noise filtering parameters corresponding to the noise information of the at least two non-overlapping frequency bands in sequence according to the noise information of the at least two non-overlapping frequency bands in time sequence.
7. The active noise reduction method according to claim 1, wherein the step of receiving and processing the second noise information according to the adjusted at least two noise filtering parameters comprises:
and receiving and processing the second noise information according to the adjusted at least two noise filtering parameters in time sequence.
8. The active noise reduction method of claim 1, wherein the step of obtaining first noise information within the cavity is preceded by:
receiving digital audio signals intermittently generated by an external device;
detecting whether the digital audio signal is received or not, and executing the step of acquiring first noise information in the cavity when the digital audio signal is not received; and when the digital audio signal is received, suspending the step of acquiring the first noise information in the cavity.
9. The active noise reduction method according to claim 8, wherein the step of obtaining first noise information within the cavity is performed when detecting whether the digital audio signal is received and the digital audio signal is not received; when the digital audio signal is received, the step of obtaining the first noise information in the cavity is suspended, and the step comprises the following steps:
and detecting whether the digital code stream of the digital audio signal is received or not to judge whether the digital audio signal is received or not.
10. An active noise reduction device comprising:
the shell is used for being coupled with a human body to form a cavity;
the first sensor is used for acquiring first noise information in the cavity;
the frequency division module is electrically connected with the first sensor and is used for dividing the first noise information into noise information of at least two frequency bands which are not overlapped with each other according to a preset frequency band;
the control module is connected with the frequency division module and used for respectively adjusting at least two noise filtering parameters corresponding to the noise information of the at least two non-overlapping frequency bands according to the noise information of the at least two non-overlapping frequency bands;
the second sensor is used for acquiring second noise information outside the cavity;
and the audio processing module is respectively connected with the control module and the second sensor and is used for receiving and processing the second noise information according to the adjusted at least two noise filtering parameters so as to output audio data with noise reduction effect.
11. The active noise reduction device of claim 10, wherein the crossover module comprises at least two crossover filters corresponding to the at least two non-overlapping frequency bins.
12. The active noise reduction device of claim 10, wherein the audio processing module comprises at least two processing filters connected to the control module; the processing filter is used for processing the second noise information.
13. The active noise reduction device of claim 10, wherein the frequency dividing module is configured to sequentially divide the first noise information into the noise information of at least two non-overlapping frequency segments according to a preset frequency segment.
14. The active noise reduction device according to claim 10, wherein the control module is configured to sequentially adjust at least two noise filtering parameters corresponding to the noise information of the at least two non-overlapping frequency bins according to the noise information of the at least two non-overlapping frequency bins.
15. The active noise reduction device according to claim 10, wherein the audio processing module is configured to receive and process the second noise information according to the at least two adjusted noise filtering parameters in time sequence to output audio data with noise reduction effect.
16. The active noise reduction device of claim 10, further comprising an audio signal input module connected to the control module; the audio signal input module is used for receiving digital audio signals intermittently generated by external equipment; wherein,
when the control module detects that the audio signal input module does not receive the digital audio signal, the control module controls the frequency division module to work; when the control module detects that the audio signal input module receives the digital audio signal, the control module controls the frequency dividing module to pause.
17. The active noise reduction device of claim 16, wherein the control module further comprises a digital stream detection unit, and the digital stream detection unit is configured to detect whether the audio signal input module receives the digital stream of the digital audio signal, so as to determine whether the digital audio signal is received.
18. An active noise reducing headphone, comprising:
the shell is used for being coupled with a human body to form a cavity;
the first sensor is used for acquiring first noise information in the cavity;
the frequency division module is electrically connected with the first sensor and is used for dividing the first noise information into noise information of at least two frequency bands which are not overlapped with each other according to a preset frequency band;
the control module is connected with the frequency division module and used for respectively adjusting at least two noise filtering parameters of the noise information corresponding to the frequency bands which do not overlap with each other according to the noise information of the frequency bands which do not overlap with each other;
the second sensor is used for acquiring second noise information outside the cavity;
and the audio processing module is respectively connected with the control module and the second sensor and is used for receiving and processing the second noise information according to the adjusted at least two noise filtering parameters so as to output audio data with noise reduction effect.
19. The active noise reducing headphone of claim 18, wherein the headphone comprises a headphone or an in-ear headphone.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2018/071531 WO2019134115A1 (en) | 2018-01-05 | 2018-01-05 | Active noise reduction method and apparatus, and earphones |
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| CN108235818A true CN108235818A (en) | 2018-06-29 |
| CN108235818B CN108235818B (en) | 2020-02-21 |
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| CN108235818B (en) | 2020-02-21 |
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