WO2019134115A1

WO2019134115A1 - Active noise reduction method and apparatus, and earphones

Info

Publication number: WO2019134115A1
Application number: PCT/CN2018/071531
Authority: WO
Inventors: 谢冠宏; 黎懋紘; 王辉
Original assignee: 万魔声学科技有限公司
Priority date: 2018-01-05
Filing date: 2018-01-05
Publication date: 2019-07-11
Also published as: CN108235818A; CN108235818B

Abstract

An active noise reduction method for reducing noise in a cavity formed by a coupling between a housing and a user. The method comprises: acquiring first noise information in a cavity; dividing, according to preset frequency bands, the first noise information into noise information of at least two frequency bands that do not overlap with each other; adjusting, according to the noise information of the frequency bands that do not overlap with each other, at least two noise filtering parameters corresponding to the noise information of the frequency bands that do not overlap with each other; acquiring second noise information outside the cavity; and receiving the adjusted at least two noise filtering parameters, and processing the second noise information according to the same, so as to output audio data having reduced noise. A rough noise filtering parameter is configured first, and then feedback-based correction is performed on the noise filtering parameter during use, such that a large number of early stage calculations for obtaining a universally applicable noise filtering parameter are eliminated, and adaptive correction is performed for different use environments, thereby improving the adaptability of noise filtering parameters to different environments.

Description

Active noise reduction method, device and earphone

Technical field

The present invention relates to the field of noise reduction technology, and in particular to an active noise reduction device and an earphone, and an active noise reduction method.

Background technique

In real life, when the user wears the earphone, the casing of the earphone is coupled with the human body to form a cavity. On the one hand, external noise can be transmitted into the cavity through the housing, and the housing has a certain filtering effect on the external noise. As the shape of the housing and the material are different, the filtering effect on the external noise is also different. On the other hand, the external noise can also leak into the cavity through the gap between the housing and the human ear. As the degree of coupling between the housing and the human body is different, the degree of external noise leaking into the cavity is also different. The closer the coupling is, the less noise is leaking into the cavity. Therefore, the noise heard by the human ear is not equal to the external noise. In fact, some noise that the outside noise propagates through the casing or leaks into the cavity through the gap is heard. Therefore, the values of the noise filtering parameters in the active noise reduction technology can be derived from external noise, the material of the casing, the shape of the casing, and the degree of coupling between the casing and the human body. In the conventional technology, the process of obtaining a generally applicable filter noise parameter is complicated and the filter noise effect is poor.

Summary of the invention

Based on this, it is necessary to provide an active noise reduction method based on feedback adjustment for the problem of poor filtering effect of noise filtering parameters.

In addition, an active noise reduction device and headphones are provided.

An active noise reduction method for reducing noise in a cavity formed by coupling a housing and a human body, including:

Obtain the first noise information in the cavity.

The first noise information is divided into noise information of at least two frequency segments that do not overlap each other according to the preset frequency segment.

At least two filter parameters corresponding to the noise information of the mutually non-overlapping frequency segments are respectively adjusted according to the noise information of the frequency segments that do not overlap each other.

Obtaining second noise information outside the cavity.

Receiving and processing the second noise information according to the adjusted at least two filter parameters to output audio data having a noise reduction effect.

In one embodiment, the step of dividing the first noise information into the noise information of the at least two non-overlapping frequency segments according to the preset frequency segment comprises:

The first noise information is divided into noise information of at least two non-overlapping frequency segments by at least two frequency dividing filters.

In one embodiment, the step of respectively adjusting at least two filter parameters corresponding to the noise information of the frequency segments that do not overlap each other according to the noise information of the frequency segments that do not overlap each other includes:

The at least two filtering parameters are adjusted according to noise information of mutually non-overlapping frequency segments by a control module that connects at least two frequency dividing filters.

In one embodiment, the step of receiving the second noise information according to the adjusted at least two filtering parameters to output the audio data having the noise reduction effect comprises:

The second noise information is received by the at least two processing filters connected to the control module and correspondingly processed according to the at least two filter parameters to output audio data having a noise reduction effect.

The first noise information is sequentially separated according to the preset frequency segment by noise information of at least two frequency segments that do not overlap each other.

In one embodiment, the step of respectively adjusting at least two filter parameters corresponding to the noise information of the at least two non-overlapping frequency segments according to the noise information of the at least two non-overlapping frequency segments comprises:

The at least two filter parameters corresponding to the noise information of the at least two non-overlapping frequency segments are sequentially adjusted in time according to the noise information of the at least two frequency segments that do not overlap each other.

In one embodiment, the step of receiving and processing the second noise information according to the adjusted at least two filter parameters includes:

Receiving and processing the second noise information according to the adjusted at least two filtering parameters in time order.

In one of the embodiments, before the step of acquiring the first noise information in the cavity, the method further includes:

Receive digital audio signals intermittently generated by external devices.

A step of detecting whether the digital audio signal is received and not acquiring the first audio information in the cavity is performed when the digital audio signal is not received. When the digital audio signal is received, the step of acquiring the first noise information in the cavity is suspended.

In one of the embodiments, it is detected whether a digital audio signal is received, and when the digital audio signal is not received, the step of acquiring first noise information in the cavity is performed. When the digital audio signal is received, the step of acquiring the first noise information in the cavity is suspended, including:

A digital stream of the digital audio signal is detected to determine whether a digital audio signal is received.

An active noise reduction device, comprising:

a housing for coupling with the human body to form a cavity.

The first sensor is configured to acquire first noise information in the cavity.

The frequency dividing module is electrically connected to the first sensor, and is configured to divide the first noise information into noise information of at least two non-overlapping frequency segments according to the preset frequency segment.

The control module is connected to the frequency division module, and is configured to respectively adjust at least two filter parameters corresponding to the noise information of the at least two non-overlapping frequency segments according to the noise information of the at least two non-overlapping frequency segments.

The second sensor is configured to acquire second noise information outside the cavity.

The audio processing module is respectively connected to the control module and the second sensor, and is configured to receive and process the second noise information according to the adjusted at least two filtering parameters to output the audio data having the noise reduction effect.

In one of the embodiments, the frequency division module includes at least two frequency division filters corresponding to at least two frequency segments that do not overlap each other.

In one of the embodiments, the audio processing module includes at least two processing filters that are coupled to the control module. A processing filter is used to process the second noise information.

In one embodiment, the frequency dividing module is configured to sequentially divide the first noise information into the noise information of the 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 filters corresponding to noise information of at least two non-overlapping frequency segments according to time information in accordance with noise information of at least two non-overlapping frequency segments. Noise parameters.

In one embodiment, the audio processing module is configured to receive and sequentially process the second noise information according to the adjusted at least two filter parameters in order of time to output audio data having a noise reduction effect.

In one of the embodiments, further comprising an audio signal input module coupled to the control module. The audio signal input module is configured to receive a digital audio signal intermittently generated by an external device. among them,

When the control module detects that the audio signal input module has not received the digital audio signal, the control module controls the frequency division module to operate. 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 suspend operation.

In one embodiment, the control module further includes a digital stream detecting unit configured to detect whether the audio signal input module receives the digital stream of the digital audio signal to determine whether the digital audio signal is received.

An active noise canceling headset, including:

a housing for coupling with the human body to form a cavity.

The control module is connected to the frequency dividing module, and is configured to respectively adjust at least two filtering parameters corresponding to the noise information of the frequency segments that do not overlap each other according to the noise information of the frequency segments that do not overlap each other.

In one of the embodiments, the earphone comprises a headset or an in-ear earphone.

The active noise reduction method firstly sets a rough filter noise parameter, and then feedback corrects the filter noise parameter during use, thereby eliminating a large amount of calculations for obtaining a generally applicable filter noise parameter in the early stage, and also for different use environments. Adaptability is made to improve the adaptability of the filter parameters to different environments.

DRAWINGS

1 is a flow chart of an active noise reduction method in an embodiment;

2 is a flow chart of an active noise reduction method in an embodiment;

3 is a flow chart of an active noise reduction method in an embodiment;

4 is a flow chart of an active noise reduction method in an embodiment;

5 is a schematic block diagram of an active noise reduction device in an embodiment;

FIG. 6 is a schematic structural diagram of an active noise reduction device in an embodiment.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are given in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be more fully understood.

As shown in FIG. 1 , an active noise reduction method may specifically include the following steps:

Step S100: Acquire first noise information in the cavity.

Step S200: The first noise information is divided into noise information of at least two frequency segments that do not overlap each other according to the preset frequency segment.

Step S300: Adjust at least two filter parameters corresponding to the noise information of the frequency segments that do not overlap each other according to the noise information of the frequency segments that do not overlap each other.

Step S400: Acquire second noise information outside the cavity.

Step S500: Receive and process the second noise information according to the adjusted at least two filter parameters to output audio data having a noise reduction effect.

Step S100: Acquire first noise information in the cavity.

The first noise information in the cavity includes the frequency, phase, amplitude, etc. of the noise. The first noise information in the cavity can be obtained by a feedback microphone disposed in the cavity. Preferably, the feedback microphone can be placed at a distance close to the driver that generates the antiphase noise, and the noise in the cavity around the driver is received to the greatest extent, thereby better restoring the noise information around the driver, so that the driver generates the inversion. Noise can more accurately offset the noise in the cavity.

The frequency segment is divided into a plurality of preset frequency segments by a frequency division point, and the frequency segments do not overlap 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 segment distribution of the second noise information.

In one embodiment, the frequency division points may be arranged in a concentrated frequency segment of the noise concentration distribution, and the frequency division points may be arranged in the remaining frequency segments without even dividing the frequency division points, thereby saving components and not affecting active noise reduction. effect. For example, 4KHz, 2KHz, 1KHz, and 500Hz are used as preset frequency dividing points, and can be divided into preset frequency segments of 4KHz-2KHz, 2KHz-1KHz, and 1KHz-500Hz. If the noise is concentrated in the frequency range of 4KHz-1KHz, the crossover point of 500Hz can be omitted. The newly set crossover point is 4KHz, 2KHz, 1KHz, and the corresponding new preset frequency range is 4KHz-2KHz, 2KHz. -1KHz. In this way, the frequency dividing filter corresponding to the frequency range of 1 kHz to 500 Hz can be omitted, thereby achieving the purpose of saving components.

In one embodiment, the preset frequency segment selects the low frequency frequency segment, because the soundproof material of the outer casing can largely isolate the medium and high frequency noise of the environment, and the first noise propagated into the cavity formed by the coupling of the human ear and the earphone is mainly The low-frequency noise is difficult to filter out by the sound-insulating material, so the active noise-reducing device can selectively reduce the noise of the low-frequency noise, thereby saving the frequency-dividing filter, reducing the calculation amount when adjusting the filtering parameters, and improving the detection equipment. Detection speed.

Preferably, the preset frequency dividing points may be selected from 8 KHz, 4 KHz, 2 KHz, 1 KHz, 750 Hz, 500 Hz, 250 Hz, and 125 Hz. Thereby, the first noise information is divided into eight pieces of noise information of mutually non-overlapping frequency segments.

In one embodiment, as shown in FIG. 2, step S200 includes step S210: dividing the first noise information into noise information of at least two non-overlapping frequency segments by at least two frequency dividing filters.

In an embodiment, if the preset frequency dividing point selects 8KHz, 4KHz, 2KHz, 1KHz, 750Hz, 500Hz, 250Hz, and 125Hz, the first noise information is divided into 8 mutual through the corresponding 8 frequency dividing filters. Noise information for frequency segments that do not overlap.

In an embodiment, as shown in FIG. 3, step S200 includes step S220: sequentially dividing the first noise information into noise information of at least two non-overlapping frequency segments according to a preset frequency segment.

The process of sequentially separating the noise information of different frequency segments according to the time sequence may sequentially separate the noise information of each preset frequency segment according to a preset order. The preset order may be from a low frequency segment to a high frequency segment, or from a high frequency segment to a low frequency segment, and may be divided in a random order. For example, first, the noise information of the 4KHz-2KHz frequency band in the first noise information is separated, and the frequency division result is pushed to the corresponding device. Then, the noise information of the frequency band of 2KHz-1KHz in the first noise information is separated, and the frequency division result is pushed to the corresponding device, and then the noise information of the frequency band of 1KHz-500Hz in the first noise information is separated, and the detection result is pushed. Give the corresponding device. By sequentially dividing the noise information of each frequency segment, the calculation amount in the same time period can be reduced, which is helpful for the rapid response of the active noise reduction process. As the amount of calculation decreases, it also helps to reduce the number of components and reduce costs.

In one embodiment, the correspondence between the noise filtering parameter and the separated noise information of the frequency segments that do not overlap each other may be one-to-one correspondence, or the noise information of the plurality of frequency segments may correspond to one filtering parameter. The noise information of one frequency segment may correspond to a plurality of filter noise parameters.

In one embodiment, as shown in FIG. 2, step S300 includes step S310: adjusting at least two filter parameters according to noise information of mutually non-overlapping frequency segments by a control module that connects at least two frequency division filters.

The filter noise parameters include the filter coefficients of the processing filter. In one embodiment, the filter coefficients of the five processing filters may be adjusted correspondingly according to the noise information of the five non-overlapping frequency segments separated by the five frequency dividing filters. It is also possible to adjust the filter coefficients of three or five processing filters according to the noise information of eight mutually non-overlapping frequency segments separated by the eight frequency dividing filters.

In an embodiment, as shown in FIG. 3, step S300 includes step S320: sequentially adjusting, according to noise information of at least two mutually overlapping frequency segments, time-sequentially corresponding to at least two non-overlapping frequency segments. At least two filter parameters of the noise information.

In addition to adjusting the filter noise parameters at the same time period, the filter noise parameters can also be adjusted in time.

In one embodiment, the previously separated noise information may be prioritized to improve the response speed of the adjusted filter parameters. For example, after the noise information of the 4KHz-2KHz frequency segment in the first noise information is separated, the filter noise parameter corresponding to the 4KHz-2KHz frequency segment is preferentially corrected according to the noise information. Then, according to the noise information of the 2KHz-1KHz frequency segment in the first noise information, the corresponding filtering parameters of the 2KHz-1KHz frequency segment are adjusted. By prioritizing the previously detected noise information, the response speed of the process of adjusting the filtering parameters is improved.

Step S400: Acquire second noise information outside the cavity.

The second noise information includes the frequency, phase, amplitude, and the like of the noise. The second noise information can be obtained through the feedforward microphone, and the feedforward microphone is disposed outside the cavity. Preferably, the feedforward microphone can be placed at a distance from the driver that generates the inverting noise to avoid interference with the reversed noise emitted by the driver when acquiring the second noise information.

Processing the second noise information according to the filter noise parameter to generate audio data having a noise reduction effect, and driving the driver located in the cavity to generate an inverted noise sound wave that is 180° out of phase with the first noise sound wave in the cavity A noise is neutralized to achieve the purpose of active noise reduction. The driver can be a speaker, specifically a moving coil speaker, a pneumatic speaker, an electromagnetic speaker, or the like.

In an embodiment, as shown in FIG. 2, step S500 includes step S510: receiving, by the at least two processing filters connected to the control module, and processing the second noise information according to the at least two filtering parameters, so that the output has noise reduction. The audio data of the effect.

The filter noise parameter is specifically corresponding to the processing filter of each frequency segment, and the filter coefficient is adjusted by adjusting the filter coefficient of the processing filter. A plurality of processing filters corresponding to different filter parameters may be set, and the plurality of processing filters respectively process noise information of different frequency segments in the second noise information. For example, the noise filtering parameters may include an intermediate frequency filtering parameter and a low frequency filtering parameter. The IF filter parameter corresponds to the filter coefficient of the first processing filter, the low frequency filter parameter corresponds to the filter coefficient of the second process filter, and the MF filter parameter is adjusted by adjusting the filter coefficient of the first process filter, and the second process is adjusted by adjusting The filter coefficients of the filter are used to adjust the low frequency filter parameters. At this time, the low frequency noise information in the second noise information is processed according to the low frequency filtering parameter to generate the inverted low frequency noise; and the intermediate frequency noise information in the second noise information is processed according to the intermediate frequency filtering parameter to generate the inverted intermediate frequency noise. It should be noted that the noise filtering parameter may also include a high frequency filtering parameter.

In an embodiment, as shown in FIG. 3, step S500 includes step S520: receiving and sequentially processing the second noise information according to the adjusted at least two filter parameters in chronological order.

In an embodiment, the filtering parameters may be sequentially adjusted according to a time sequence, and the filtering parameters corresponding to different frequency segments may be sequentially adjusted according to a preset sequence. The preset sequence may be from a low frequency segment to a high frequency segment, or may be a high value. The frequency segment to the low frequency segment can also be adjusted in a random order.

In an embodiment, as shown in FIG. 4, before step S100, the method further includes:

Step S610: Receive a digital audio signal intermittently generated by an external device.

Step S620: detecting whether a digital audio signal is received. When the digital audio signal is not received, the step of acquiring first noise information in the cavity is performed; and when the digital audio signal is received, the step of acquiring the first noise information in the cavity is suspended. As shown in FIG. 4, further, step S620 skips the step of receiving the digital audio signal generated by the external device intermittently 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 a headset, an external device such as a speaker intermittently plays music in the cavity. If the first noise information in the cavity is acquired during the time period in which the music is played, the music information will be inevitably mixed. At this time, additional complicated equipment is needed to filter the obtained music information. By acquiring the first noise information when the digital audio signal is not received (when the music is not played), it is possible to avoid adding additional complicated equipment to filter out the detected audio information in the cavity, thereby saving cost.

In one embodiment, the detection may be by detecting whether a digital stream of digital audio signals is received to determine whether a digital audio signal is received. The digital stream is a digitally formed data stream of digital audio signals. By detecting the digital stream, the audio gap can be judged more accurately and quickly, and the components required for detection are relatively simple.

Based on the same inventive concept, an active noise reduction device is provided below. As shown in Figure 5, the active noise reduction device includes:

A housing (not shown) for coupling with the human body to form a cavity.

The first sensor 610 is configured to acquire first noise information in the cavity.

The frequency dividing module 620 is electrically connected to the first sensor 610, and is configured to divide the first noise information into noise information of at least two non-overlapping frequency segments according to the preset frequency segment.

The control module 630 is connected to the frequency dividing module 620, and is configured to respectively adjust at least two filtering parameters corresponding to noise information of at least two mutually non-overlapping frequency segments according to noise information of at least two mutually overlapping frequency segments. .

The second sensor 640 is configured to acquire second noise information outside the cavity.

The audio processing module 650 is connected to the control module 630 and the second sensor 640 respectively for receiving and processing the second noise information according to the adjusted at least two filtering parameters to output audio data having a noise reduction effect.

The housing is part of an audio device such as a headset, the first sensor 610 can be a feedback microphone and the second sensor 640 can be a feedforward microphone. The processing steps of the frequency dividing module 620 can be referred to step S200 of the above embodiment. For the processing steps of the control module 630, reference may be made to step S300 and step S310 of the foregoing embodiment. The processing steps of the audio processing module 650 can refer to step S500 of the above embodiment. I will not repeat them here.

In one embodiment, the frequency division module 620 includes at least two frequency division filters corresponding to at least two frequency segments that do not overlap each other. The processing steps of the frequency dividing filter can be referred to step S210 of the above embodiment.

In one embodiment, the frequency dividing module 620 is configured to sequentially divide the first noise information into the noise information of the at least two non-overlapping frequency segments according to a preset frequency segment. The processing steps of the frequency dividing filter can be referred to step S220 of the above embodiment.

In an embodiment, the control module 630 is configured to sequentially adjust at least two filters corresponding to noise information of at least two non-overlapping frequency segments according to time information in accordance with noise information of at least two non-overlapping frequency segments. Noise parameters. The processing steps of the control module 630 can refer to step S320 of the above embodiment.

In one embodiment, the audio processing module 650 includes at least two processing filters that are coupled to the control module 630. A processing filter is used to process the second noise information. The processing steps of the processing filter can be referred to step S510 of the above embodiment.

In one embodiment, the audio processing module 650 is configured to receive and sequentially process the second noise information according to the adjusted at least two filter parameters in time series to output audio data having a noise reduction effect. The processing steps of the audio processing module 650 can refer to step S520 of the above embodiment.

In one embodiment, as shown in FIG. 6, the active noise reduction device 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 headset or an in-ear earphone. A portion of the noise outside the casing 710 may leak into the casing 710. The noise inside the casing 710 is referred to as a first noise, and the noise outside the casing 710 is referred to as a second noise. The first sensor 720 is a feedback microphone, and the first sensor 720 acquires first noise information in the cavity. The first noise information is transmitted to the frequency dividing module 730 through the audio stream 1. The frequency dividing module 730 is first according to the preset frequency segment. The noise information is divided into a plurality of noise information of mutually non-overlapping frequency segments, and then the control flow 4 is transmitted to the control module 740. The control module 740 receives and processes the control flow 4 to adjust the filter noise parameters of at least two different frequency segments. The parameters include the filter coefficients. Then, the control module 740 passes the adjusted filter noise parameter to the audio processing module 750 through the control flow 2, and the audio processing module 750 adjusts the filter coefficient of the self processing filter according to the adjusted filter noise parameter, and the processing filter processes the second sensor. The second noise information acquired by 760 is to output audio data having a noise reduction effect to the driver 770. The driver 770 plays the audio data to generate a noise reduction sound.

Further, the control module 740 is connected to the audio input module 780. The audio input module 780 intermittently inputs a digital audio signal (such as inputting a plurality of music audio signals, and there is a time gap between each piece of music). The frequency dividing module 730 has a switching function, and performs frequency dividing work in each music gap. Specifically, the control module 740 is connected to the audio input module 780 to determine whether it is currently in a music gap by detecting a digital stream of the digital audio signal (ie, control stream 1). Control module 740 generates control flow 3 based on control flow 1 to control opening of frequency divider module 730 at the music gap.

The active noise reduction device realizes the first noise information remaining in the cavity on the basis of the original noise reduction processing, and adjusts the filtering noise parameter according to the first noise information frequency segment feedback, and the adjusted filter noise parameter can be used to eliminate the residual noise. Noise information to improve the accuracy of active noise reduction processing.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An active noise reduction method for reducing noise in a cavity formed by coupling a housing and a human body, including:

Obtaining first noise information in the cavity;

And dividing the first noise information into noise information of at least two frequency segments that do not overlap each other according to a preset frequency segment;

And adjusting, according to the noise information of the mutually non-overlapping frequency segments, at least two filter parameters corresponding to the noise information of the mutually non-overlapping frequency segments;

Obtaining second noise information outside the cavity;

Receiving and processing the second noise information according to the adjusted at least two filter noise parameters to output audio data having a noise reduction effect.
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 segments according to a preset frequency segment comprises:

The first noise information is divided into noise information of at least two non-overlapping frequency segments by at least two frequency dividing filters.
The active noise reduction method according to claim 2, wherein the at least two filtering noises corresponding to the noise information of the mutually non-overlapping frequency segments are respectively adjusted according to the noise information of the mutually non-overlapping frequency segments The steps of the parameters, including:

The at least two filter parameters are adjusted according to the noise information of the mutually non-overlapping frequency segments by connecting the control modules of the at least two frequency dividing filters.
The active noise reduction method according to claim 3, wherein said step of receiving and processing said second noise information to output audio data having a noise reduction effect according to said adjusted at least two filter noise parameters ,include:

The second noise information is received by at least two processing filters connected to the control module and correspondingly processed according to the at least two filter parameters to output audio data having a noise reduction effect.
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 segments according to a preset frequency segment comprises:

And the first noise information is sequentially divided according to the preset frequency segment into noise information of at least two frequency segments that do not overlap each other.
The active noise reduction method according to claim 1, wherein the noise information corresponding to the at least two non-overlapping frequency segments is respectively adjusted according to noise information of the at least two non-overlapping frequency segments The steps of at least two filtering parameters include:

And at least two filter parameters corresponding to the noise information of the at least two non-overlapping frequency segments are sequentially adjusted in time according to the noise information of the at least two non-overlapping frequency segments.
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 filtering parameters comprises:

Receiving and sequentially processing the second noise information according to the adjusted at least two filter noise parameters in time series.
The active noise reduction method according to claim 1, wherein the step of acquiring the first noise information in the cavity further comprises:

Receiving a digital audio signal intermittently generated by an external device;

Detecting whether the digital audio signal is received, and when the digital audio signal is not received, performing the step of acquiring first noise information in the cavity; and when receiving the digital audio signal, suspending performing the obtaining a step of first noise information within the cavity.
The active noise reduction method according to claim 8, wherein the detecting whether the digital audio signal is received, and when the digital audio signal is not received, performing the acquiring the first noise information in the cavity Step: when the digital audio signal is received, the step of acquiring the first noise information in the cavity is suspended, including:

A digital stream of the digital audio signal is detected to determine whether the digital audio signal is received.
An active noise reduction device, comprising:

a housing for coupling with the human body to form a cavity;

a first sensor, configured to acquire first noise information in the cavity;

The frequency dividing module is electrically connected to the first sensor, and is configured to divide the first noise information into noise information of at least two non-overlapping frequency segments according to a preset frequency segment;

a control module, configured to be connected to the frequency dividing module, configured to respectively adjust at least two noise information corresponding to the at least two non-overlapping frequency segments according to the noise information of the at least two non-overlapping frequency segments Filter noise parameters;

a second sensor, configured to acquire second noise information outside the cavity;

The audio processing module is respectively connected to the control module and the second sensor, and configured to receive and process the second noise information according to the adjusted at least two filtering parameters to output audio data with a noise reduction effect .
The active noise reduction apparatus according to claim 10, wherein said frequency dividing module comprises at least two frequency dividing filters corresponding to said at least two non-overlapping frequency segments.
The active noise reduction apparatus according to claim 10, wherein said audio processing module comprises at least two processing filters connected to said control module; said processing filter is operative to process said second noise information.
The active noise reduction device according to claim 10, wherein the frequency dividing module is configured to sequentially divide the first noise information into at least two non-overlapping frequency segments according to a preset frequency segment. information.
The active noise reduction device according to claim 10, wherein the control module is configured to sequentially adjust, according to the noise information of the at least two non-overlapping frequency segments, to the at least two mutual At least two filter parameters of the noise information of the non-overlapping frequency segments.
The active noise reduction device according to claim 10, wherein the audio processing module is configured to receive and sequentially process the second noise information according to the adjusted at least two filter noise parameters in time series to output Audio data with noise reduction effect.
The active noise reduction device according to claim 10, further comprising: an audio signal input module connected to the control module; the audio signal input module is configured to receive a digital audio signal intermittently generated by an external device;

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 operate; the control module detects that the audio signal input module receives the location When the digital audio signal is described, the control module controls the frequency dividing module to suspend operation.
The active noise reduction device according to claim 16, wherein the control module further comprises a digital stream detecting unit, wherein the digital stream detecting unit is configured to detect whether the audio signal input module receives the digital audio signal Streaming to determine whether the digital audio signal is received.
An active noise canceling headset, including:

a housing for coupling with the human body to form a cavity;

a first sensor, configured to acquire first noise information in the cavity;

The frequency dividing module is electrically connected to the first sensor, and is configured to divide the first noise information into noise information of at least two non-overlapping frequency segments according to a preset frequency segment;

The control module is connected to the frequency dividing module, and configured to respectively adjust at least two filter parameters corresponding to the noise information of the non-overlapping frequency segments according to the noise information of the mutually non-overlapping frequency segments;

a second sensor, configured to acquire second noise information outside the cavity;

The audio processing module is respectively connected to the control module and the second sensor, and configured to receive and process the second noise information according to the adjusted at least two filtering parameters to output audio data with a noise reduction effect .
The active noise canceling earphone of claim 18, wherein the earphone comprises a headset or an in-ear earphone.