WO2020051769A1 - Active noise cancelling method and headset - Google Patents
Active noise cancelling method and headset Download PDFInfo
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- WO2020051769A1 WO2020051769A1 PCT/CN2018/105035 CN2018105035W WO2020051769A1 WO 2020051769 A1 WO2020051769 A1 WO 2020051769A1 CN 2018105035 W CN2018105035 W CN 2018105035W WO 2020051769 A1 WO2020051769 A1 WO 2020051769A1
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- noise reduction
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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
- H04R1/1041—Mechanical or electronic switches, or control elements
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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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
- H04R2410/00—Microphones
- H04R2410/05—Noise reduction with a separate noise microphone
Definitions
- the present application relates to the technical field of noise reduction, and in particular, to an active noise reduction method and headphones.
- the purpose of some embodiments of the present application is to provide an active noise reduction method and earphones, which are designed to filter out leaked audio signals in external noise signals, so that the earphones can actively perform noise reduction based on actual noise signals that are more pure and closer to the real situation. To improve playback quality.
- An embodiment of the present application provides an active noise reduction method, including:
- An embodiment of the present application further provides an active noise reduction earphone, which includes: at least one processor, a sound collection device communicatively connected to the at least one processor, and a memory communicatively connected to the at least one processor; wherein,
- the sound collection device is located in the shell of the headset and is used to obtain external noise signals
- the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the foregoing active noise reduction method.
- the embodiment of the present application acquires a leaked audio signal when the active noise reduction headset plays audio, so as to process the external noise signal acquired by the sound collection device according to the acquired leaked audio signal. Filter out the leaked audio signal in the external noise signal, so as to obtain a more pure and actual noise signal closer to the real situation.
- the headset can perform real-time noise reduction based on the acquired actual noise signal, thereby avoiding as much as possible the audio damage caused by the noise reduction, and improving the playback quality.
- acquiring the leaked audio signal specifically includes: acquiring an audio audio playback signal; acquiring a leak transfer function, and acquiring the leaked audio signal according to the leak transfer function and the audio playback signal. In this way, a specific implementation form of acquiring the leaked audio signal is provided.
- obtaining the leak transfer function specifically includes: adopting the Least Mean Square LMS (Least Mean Square, "LMS") principle and the initial setting of the array H m (i), according to the formula
- LMS Least Mean Square
- err (m) n music (m) -n ' music (m)
- H m + 1 (i) H m (i) + ⁇ S music (m-N + i) * err (m), err (m) satisfies H m (i) corresponding to the preset condition as the value of the leakage transfer function at time m
- n ' music (m) represents the estimated leakage audio signal at time m
- N is a positive integer
- i represents the i-th value in N
- S music (m-N + i) represents the audio amplitude of the audio playback signal at time m-N + i
- H m (i) represents the ith leakage transfer function at time m Err (m) represents the error between
- the array H m (i) is continuously modified to obtain the most suitable leak transfer function in the current situation, which provides a basis for obtaining a more accurate leaked audio signal, thereby enabling Get an actual noise signal closer to the real situation to further improve playback quality.
- the method before real-time noise reduction based on the actual noise signal, the method further includes: obtaining the intensity of the noise actually transmitted to the eardrum corresponding to the actual noise signal; and determining whether the intensity of the noise actually transmitted to the eardrum is greater than or equal to a preset noise value. In this way, it provides a basis for real-time noise reduction for active noise reduction headphones when the intensity of the noise actually transmitted to the eardrum is large, thereby reducing power consumption.
- the active noise reduction method also includes: obtaining product parameter information of the headset; and setting a working clock for real-time noise reduction according to the product parameter information of the headset. In this way, not only the good playback quality of the headphones can be guaranteed, but also the power consumption can be reduced.
- FIG. 1 is a flowchart of an active noise reduction method according to a first embodiment of the present application
- FIG. 2 is a schematic diagram of a functional module of an active noise reduction earphone according to the first embodiment of the present application
- FIG. 3 is a schematic diagram of functional modules of the noise control unit 12 according to the first embodiment of the present application.
- FIG. 4 is a flowchart of an active noise reduction method according to a third embodiment of the present application.
- FIG. 5 is a schematic structural diagram of an active noise reduction earphone according to a fifth embodiment of the present application.
- the first embodiment of the present application relates to an active noise reduction method.
- the specific process is shown in FIG. 1.
- the active noise reduction method in this embodiment is implemented on an active noise reduction headset.
- the active noise reduction headset includes at least one processor, a sound collection device communicatively connected to the at least one processor, and a communication connection connected to the at least one processor.
- Memory wherein the sound collection device is located in the shell of the headset and used to obtain external noise signals; the memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor to enable the at least one processor to execute the implementation Active noise reduction method in the example.
- step 101 when audio is played, a leaked audio signal is obtained, and an external noise signal is obtained through a sound collection device located in a headphone shell.
- the sound collection device of the earphone shell may be a microphone or a microphone array.
- the audio playback signal of the audio to be played is known information for the active noise reduction headphones. Therefore, the way for the active noise reduction headphones to obtain the leaked audio signal can be: the active noise reduction headphones obtain the audio audio playback signals, and Obtain a leaked transfer function, so as to obtain a leaked audio signal according to the leaked transfer function and the audio playback signal.
- a technician can use a professional instrument (such as a frequency response analyzer) in advance to measure and obtain the leakage transfer function of the active noise reduction headset, and store the obtained leakage transfer function in the memory of the active noise reduction headset in advance. , So that the active noise-cancelling headphones can obtain the leakage transfer function.
- a professional instrument such as a frequency response analyzer
- n music M * H.
- Step 102 Filter out the leaked audio signal in the external noise signal to obtain the actual noise signal.
- the relationship between the actual noise signal, the leaked audio signal, and the external noise signal conforms to the following formula:
- n ref n mic -M * H.
- the leaked audio signal obtained by the active noise reduction headphones may be n music in the digital domain, and the active noise reduction headphones may be provided with an analog-to-digital conversion device and a filter to facilitate active noise reduction.
- the active noise reduction headset when the active noise reduction headset obtains the actual noise signal n ref in the digital domain, it can send the leaked audio signal n music in the digital domain and n mic in the digital domain to a filter for filtering to obtain the actual noise signal n ref .
- the analog-to-digital conversion device can be a Digital Signal Processing (DSP) device, a Field Programmable Gate Array (FPGA) device, or a special-purpose integration.
- Circuit ASIC device Application Specific Integrated Circuit (referred to as "ASIC"), etc.
- the filter can be FIR (Finite Impulse Response (FIR)) filter, or IIR (Infinite Impulse Response (IIR)) .
- FIR Finite Impulse Response
- IIR Intelligent Impulse Response
- active noise-cancelling earphones are generally provided with filters, so technicians can directly use the original filters of active noise-cancelling earphones to filter out leaked audio signals, or they can add a separate filter for leakage. Filtering of audio signals. This embodiment does not limit this in any way.
- Step 103 Perform real-time noise reduction based on the actual noise signal.
- the active noise reduction headset inverts the actual noise signal and superimposes it with the playback audio to achieve active noise reduction.
- the active noise reduction headset includes: a sound collection device 11, a noise control unit 12, an audio receiving unit 13, a reverse noise generation unit 14, an error processing unit 15, a speaker system 16, and an error microphone collection unit 17.
- the sound collection device 11 is located in the earphone shell, and is used to obtain an external noise signal.
- the noise control unit 12 is configured to process an external noise signal, filter out a leaked audio signal in the external noise signal, and obtain an actual noise signal that is relatively pure and close to a real situation.
- the audio receiving unit 13 is configured to receive an audio playback signal.
- the reverse noise generating unit 14 is configured to reverse the actual noise signal, so that the reversed signal is superimposed on the audio playback signal obtained by the audio acquisition unit 13 to obtain an anti-noise frequency signal.
- the speaker system 16 is located inside the earphone and is used for playing anti-noise frequency signals.
- the error microphone acquisition unit 17 is located inside the headset and is used to pick up the audio signal that is actually played by the speaker system 16 (the noise here refers to the part of the noise 202 leaking to the inside of the headset), so that the error processing unit 15 generates an error signal and transmits the error signal to the reverse noise generating unit 14, so that the reverse noise generating unit 14 obtains a more accurate anti-noise frequency signal according to the error signal.
- the dashed line 201 indicates the propagation path of Noise 2 to the sound collection device 11
- 202 indicates the transmission path of Noise 2 to the human eardrum
- 203 indicates the leakage path of the speaker system 16 to the sound collection device 11.
- the functions of the sound collection device 11 and the error microphone collection unit 17 can be implemented by a traditional microphone (which can be an analog microphone or a digital microphone).
- the noise control unit 12, the audio receiving unit 13, and the reverse noise generating unit 14 The functions of the error processing unit 15 can be realized by digital devices, such as DSP, FPGA, MCU (Microcontroller Unit, "MCU” for short) and so on.
- the noise control unit 12 may be considered to include the following sub-units: an audio playback detection sub-unit 121, a leakage signal acquisition unit 122, and a leakage signal elimination unit 123.
- the audio playback detection sub-unit 121 is configured to detect the state of the speaker system 16 and determine whether the speaker system 16 is playing audio. If the speaker system 16 is playing audio, the leakage signal acquisition unit 122 acquires the leakage audio signal, so that the leakage signal cancellation unit 123 filters out the leakage audio signal in the external noise signal.
- the above-mentioned feed-forward active noise-cancelling headphones belong to a closed-loop system and achieve the purpose of noise reduction through a feedback method. Since the reverse noise generating unit 14 in this application is based on a relatively pure and close to real The actual noise signal of the situation is inverted, so the active noise reduction method in this application can also solve the problem of instability of the active noise reduction headphones in the prior art, and improve the stability of the active noise reduction headphones.
- the active noise reduction headset acquires a leaked audio signal when playing audio, so as to process and filter the external noise signal acquired by the sound collection device according to the acquired leaked audio signal. Eliminate the leaked audio signal in the external noise signal, so as to obtain a purer and closer to the actual noise signal.
- the headset can perform real-time noise reduction based on the acquired actual noise signal, thereby avoiding as much as possible the audio damage caused by the noise reduction, and improving the playback quality.
- each unit involved in this embodiment is a logical unit.
- a logical unit may be a physical unit, or a part of a physical unit, or multiple physical units. Implementation of the combination.
- no unit that is not closely related to solving the technical problem proposed by the present invention is introduced, but this does not indicate that there are no other units in this embodiment.
- the second embodiment of the present application relates to an active noise reduction method.
- the second embodiment is substantially the same as the first embodiment, and the main difference is that the leak transfer function is obtained in different ways, which are described below in detail:
- the active noise-cancelling earphone uses the principle of minimum equalization algorithm LMS and the initial setting of the array H m (i), according to the formula
- n ' music (m) represents the estimated leaked audio signal at time m; N is a positive integer; i represents the i-th value in N; S music (m-N + i) represents the m-N + i moment Audio amplitude of the audio playback signal; H m (i) represents the ith leakage transfer function at time m; err (m) represents the actual leaked audio signal n music (m) and the estimated leaked audio signal n ' music (m ), ⁇ represents the update step.
- the preset conditions can be set in advance by a technician.
- the preset conditions can be that the ratio of err (m) to n music (m) is less than the preset threshold, or err (m) 2 and n music The ratio of (m) 2 is less than a preset threshold.
- the preset threshold may be 0.001.
- the value of N can be set in advance by a technician and stored in the active noise reduction headset.
- the larger the value of N is, the larger the power consumption of the active noise-cancelling headphones is. Therefore, a technician can set the value of N according to actual power consumption requirements, for example, N can be 40.
- the active noise reduction earphone uses the minimum equalization algorithm LMS to continuously modify the initially set H m (i), so as to obtain the H m (i) that best matches the current actual situation.
- the audio played by the active noise-cancelling headphones can be preset audio, so that when the active noise-cancelling headphones play the preset audio, H m (i) can be modified to obtain the H m (i.e. i) for subsequent playback of other audio. In this way, not only can a better-quality playback effect be obtained, but also the H m (i) correction need not be performed when other audios are subsequently played, thereby reducing power consumption.
- the audio played by the active noise-cancelling headphones can also be the audio requested by the user.
- the active noise-cancelling headphones can modify H m (i) within a period of time to play the audio, and can also obtain better-quality playback effects, and To achieve the purpose of reducing power consumption.
- the active noise-cancelling headphones can also modify H m (i) in real time, so as to provide the best playback effect that current headphones can provide. This embodiment does not make any limitation on when the active noise-cancelling headphones modify H m (i).
- the active noise-cancelling headphones in this embodiment can obtain a leakage matching function that is more suitable in the current situation, and provides a basis for obtaining a more accurate leaked audio signal, so that it can obtain an actual closer to the real situation. Noise signal to further improve playback quality.
- the third embodiment of the present application relates to an active noise reduction method.
- the specific process is shown in FIG. 4.
- the third embodiment is improved on the basis of the first and second embodiments.
- the main improvement is that in the third embodiment of the present application, when the intensity of the noise actually transmitted to the eardrum by the active noise reduction earphone is large, Only real-time noise reduction can reduce power consumption.
- the specific description is as follows:
- Steps 301 to 302 in this embodiment are substantially the same as steps 101 to 102 in the first embodiment, and step 305 is substantially the same as step 103 in the first embodiment. In order to reduce repetition, details are not repeated here. The different parts are explained:
- Step 303 Acquire the noise intensity actually transmitted to the eardrum corresponding to the actual noise signal.
- the active noise reduction earphone obtains frequency information and intensity information of the actual noise signal, and calculates the noise intensity actually transmitted to the eardrum according to preset noise path loss information, frequency information and intensity information of the actual noise signal.
- a technician can measure the relationship between the intensity of the actual noise signal In ref and the intensity of the noise actually transmitted to the eardrum In ear on a professional device in advance.
- the technician can use linear or logarithmic frequency modulation to change the frequency range [f L , f H ] is divided into several parts, and are numbered, i.e., determining a plurality of frequency F, so that the relationship between in and in REF in ear get different frequency point, the relationship between in and in REF ear on different frequency points as the acquired Noise path loss information NPL f (where NPL is short for Noise Path Loss).
- NPL f is the ratio between the intensity of the actual noise signal In ref at different frequency points and the intensity of the noise actually transmitted to the eardrum In ear
- NPL f is equal to Since NPL f is stored in the active noise reduction headphones as noise path loss information in advance, In ear is equal to Thereby, it is possible to obtain the intensity of the noise actually transmitted to the eardrum corresponding to the actual noise signal.
- f L and f H can be selected by a technician according to actual needs.
- the technician can select f L and f H according to the characteristics of the headset and the noise reduction index.
- Step 304 Determine whether the intensity of the noise actually transmitted to the eardrum is greater than or equal to a preset noise value. If the output result of step 304 is YES, step 305 is performed, and if the output result of step 304 is no, then this process ends.
- the preset noise value is input by a technician in advance and stored in the active noise reduction headset.
- the technician can set the preset noise value according to the comfort of the human ear.
- the preset noise value can be set to be less than or equal to 15 decibels.
- this embodiment is equivalent to setting two working modes for an active noise reduction headset: an energy saving mode (without real-time noise reduction), and a noise reduction mode (with real-time noise reduction).
- the active noise reduction earphone determines the working mode according to the intensity of the noise actually transmitted to the eardrum, which can reduce power consumption and extend the use time of a single charge of the portable device under the same power.
- the fourth embodiment of the present application relates to an active noise reduction method.
- the fourth embodiment is improved on the basis of the first, second, or third embodiment.
- the main improvement is that in the fourth embodiment of the present application, the active noise reduction headset also adjusts some clocks according to the actual situation of the headset. Setting parameters can not only ensure good playback quality of the headphones, but also reduce power consumption. The specific description is as follows:
- the active noise reduction headset also obtains product parameter information of the headset, and sets a working clock for real-time noise reduction according to the product parameter information of the headset.
- the product parameter information of the headset includes one or any combination of the following information: device form, power supply method.
- the earphones of different device forms have different times when noise is transmitted to the eardrum of a human.
- the earphones of different power supply modes for example, battery power supply and external device power supply
- the active noise reduction headset can set a working clock for real-time noise reduction, so that the longer the noise is transmitted to the eardrum, the smaller the corresponding working clock of the headset, thereby reducing power consumption and extending portability under the same power. Device usage time on a single charge.
- the active noise reduction headset can set a working clock for real-time noise reduction, so that the working clock corresponding to the battery-powered headset is smaller, thereby reducing power consumption and extending the use time of a single charge of the portable device under the same power. .
- the active noise reduction headset in this embodiment sets a working clock for real-time noise reduction according to the product parameter information of the headset, which can not only ensure good playback quality of the headset, but also reduce power consumption.
- a fifth embodiment of the present application relates to an active noise-cancelling earphone, as shown in FIG. 5, including: at least one processor, a sound acquisition device communicatively connected to the at least one processor, and a memory communicatively connected to the at least one processor;
- the sound collection device is located in the shell of the headset and is used to obtain external noise signals.
- the memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor to enable the at least one processor to execute the foregoing method embodiment Active noise reduction method in.
- the memory 402 and the processor 401 are connected in a bus manner.
- the bus may include any number of interconnected buses and bridges.
- the bus connects one or more processors 401 and various circuits of the memory 402 together.
- the processor 401 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
- the memory 402 may be used to store data used by the processor 401 when performing operations.
- the embodiment of the present invention is equivalent to the prior art.
- the earphone can actively reduce noise based on an actual noise signal that is more pure and closer to the real situation to improve playback quality.
- a sixth embodiment of the present invention relates to a computer-readable storage medium storing a computer program.
- the computer program is executed by the processor, the above method embodiment is implemented.
- the embodiment of the present invention is equivalent to the prior art.
- the earphone can actively reduce noise based on an actual noise signal that is more pure and closer to the real situation to improve playback quality.
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Abstract
The present invention relates to the field of noise cancelling techniques. Provided are an active noise cancelling method and a headset. The active noise cancelling method comprises: upon playing an audio file, acquiring a leaked audio signal, and using a sound collection apparatus positioned at a housing of a headset to acquire external noise signals (101); removing the leaked audio signal from the external noise signals to acquire actual noise signals (102); and performing real-time noise cancelling according to the actual noise signals (103). Implementing an embodiment of the present invention enables a headset to perform active noise cancelling based on actual noise signals that reflect real scenarios, thereby enhancing play quality.
Description
本申请涉及降噪技术领域，特别涉及一种主动降噪方法及耳机。The present application relates to the technical field of noise reduction, and in particular, to an active noise reduction method and headphones.
随着电子产品市场的不断发展，人们对耳机音质的要求越来越高。然而，城市的噪声污染越来越严重，在室外使用普通的耳机很多时候都不能听到音乐，人们只有提高耳机播放音乐的音量来盖过噪声，才能够听到音乐。但是，这种提高耳机播放音量的方法会对听力造成损伤，因此，主动降噪耳机应运而生。With the continuous development of the electronic product market, people have higher and higher requirements for the sound quality of headphones. However, the noise pollution in cities is getting more and more serious, and ordinary headphones cannot be used to listen to music outdoors. People can only listen to music by increasing the volume of music played by the headphones to cover the noise. However, this method of increasing the playback volume of the headphones will cause hearing damage. Therefore, active noise reduction headphones came into being.
目前的主动降噪耳机大多是利用位于耳机外壳的声音采集设备获取外部噪声信号，并将采集到的外部噪声信号进行反相后与播放的音频信号进行叠加来实现主动降噪的。但是，本专利申请的发明人发现现有技术至少存在以下问题：At present, most active noise reduction headphones use active sound collection equipment located in the earphone shell to obtain external noise signals, and invert the collected external noise signals and superimpose the played audio signals to achieve active noise reduction. However, the inventor of this patent application found that the prior art has at least the following problems:
在主动降噪耳机播放音频的过程中，难免会有一部分音频信号泄露到耳机外部被声音采集设备获取到，因此声音采集设备获取的外部噪声信号是掺杂有这部分泄露的音频信号的，对掺杂有泄露音频信号的外部噪声信号进行反相、并与播放的音频信号进行叠加，反而会降低音频的音质，播放质量并不理想。During the process of active noise reduction headphones playing audio, it is inevitable that a part of the audio signal is leaked to the outside of the headphones and obtained by the sound acquisition device. Therefore, the external noise signal obtained by the sound acquisition device is doped with this part of the leaked audio signal. External noise signals doped with leaked audio signals are inverted and superimposed with the audio signals being played. Instead, the audio quality is degraded and the playback quality is not ideal.
发明内容Summary of the Invention
本申请部分实施例的目的在于提供一种主动降噪方法及耳机，旨在滤除外部噪声信号中的泄漏音频信号，令耳机能够基于更纯净、更接近真实情况的 实际噪声信号进行主动降噪，以提高播放质量。The purpose of some embodiments of the present application is to provide an active noise reduction method and earphones, which are designed to filter out leaked audio signals in external noise signals, so that the earphones can actively perform noise reduction based on actual noise signals that are more pure and closer to the real situation. To improve playback quality.
本申请实施例提供了一种主动降噪方法，包括：An embodiment of the present application provides an active noise reduction method, including:
播放音频时，获取泄漏音频信号，并通过位于耳机外壳的声音采集设备获取外部噪声信号；When playing audio, obtain leaked audio signals and obtain external noise signals through a sound collection device located in the headphone housing;
滤除外部噪声信号中的泄漏音频信号，获取实际噪声信号；Filter out the leaked audio signal in the external noise signal to obtain the actual noise signal;
基于实际噪声信号进行实时降噪。Real-time noise reduction based on actual noise signals.
本申请实施例还提供了一种主动降噪耳机，包括：至少一个处理器、与至少一个处理器通信连接的声音采集设备、以及与至少一个处理器通信连接的存储器；其中，An embodiment of the present application further provides an active noise reduction earphone, which includes: at least one processor, a sound collection device communicatively connected to the at least one processor, and a memory communicatively connected to the at least one processor; wherein,
声音采集设备位于耳机的外壳，用于获取外部噪声信号；The sound collection device is located in the shell of the headset and is used to obtain external noise signals;
存储器存储有可被至少一个处理器执行的指令，指令被至少一个处理器执行，以使至少一个处理器能够执行上述的主动降噪方法。The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the foregoing active noise reduction method.
本申请实施例相对于现有技术而言，主动降噪耳机在播放音频时，会获取泄漏音频信号，以便于根据所获取的泄漏音频信号，对声音采集设备所获取的外部噪声信号进行处理，滤除外部噪声信号中的泄漏音频信号，从而获取更纯净的、更接近真实情况的实际噪声信号。这样，耳机便能够基于所获取的实际噪声信号进行实时降噪，从而尽可能地避免了因降噪所导致的音频受损的情况，能够提高播放质量。Compared with the prior art, the embodiment of the present application acquires a leaked audio signal when the active noise reduction headset plays audio, so as to process the external noise signal acquired by the sound collection device according to the acquired leaked audio signal. Filter out the leaked audio signal in the external noise signal, so as to obtain a more pure and actual noise signal closer to the real situation. In this way, the headset can perform real-time noise reduction based on the acquired actual noise signal, thereby avoiding as much as possible the audio damage caused by the noise reduction, and improving the playback quality.
另外，获取泄漏音频信号，具体包括：获取音频的音频播放信号；获取泄漏传递函数，并根据泄漏传递函数以及音频播放信号，获取泄漏音频信号。这样，提供了获取泄漏音频信号的一种具体实现形式。In addition, acquiring the leaked audio signal specifically includes: acquiring an audio audio playback signal; acquiring a leak transfer function, and acquiring the leaked audio signal according to the leak transfer function and the audio playback signal. In this way, a specific implementation form of acquiring the leaked audio signal is provided.
另外，获取泄漏传递函数，具体包括：采用最小均分算法LMS(Least mean square，简称“LMS”)原理以及数组H
m(i)的初始设置，根据公式
公式err(m)＝n
music(m)-n'
music(m)以及公式H
m+1(i)＝H
m(i)+μS
music(m-N+i)*err(m)，将err(m)满足预设条件所对应的H
m(i)作为时刻m的泄漏传递函数的值；其中，n'
music(m)表示时刻m的预估泄漏音频信号；N为正整数；i表示N中的第i个数值；S
music(m-N+i)表示第m-N+i时刻音频播放信号的音频幅值；H
m(i)表示时刻m中的第i个泄漏传递函数的值；err(m)表示实际泄漏音频信号n
music(m)与预估泄漏音频信号n'
music(m)间的误差，μ表示更新步进。这样，基于初始设置的数组H
m(i)，对数组H
m(i)进行不断修正，以获取当前情况下最为匹配的泄漏传递函数，为获取更准确地泄漏音频信号提供了基础，从而能够获取更接近真实情况的实际噪声信号，以便于进一步地提高播放质量。
In addition, obtaining the leak transfer function specifically includes: adopting the Least Mean Square LMS (Least Mean Square, "LMS") principle and the initial setting of the array H m (i), according to the formula The formula err (m) = n music (m) -n ' music (m) and the formula H m + 1 (i) = H m (i) + μS music (m-N + i) * err (m), err (m) satisfies H m (i) corresponding to the preset condition as the value of the leakage transfer function at time m; where n ' music (m) represents the estimated leakage audio signal at time m; N is a positive integer; i Represents the i-th value in N; S music (m-N + i) represents the audio amplitude of the audio playback signal at time m-N + i; H m (i) represents the ith leakage transfer function at time m Err (m) represents the error between the actual leaked audio signal n music (m) and the estimated leaked audio signal n ' music (m), and μ represents the update step. In this way, based on the initially set array H m (i), the array H m (i) is continuously modified to obtain the most suitable leak transfer function in the current situation, which provides a basis for obtaining a more accurate leaked audio signal, thereby enabling Get an actual noise signal closer to the real situation to further improve playback quality.
另外，基于实际噪声信号进行实时降噪前，还包括：获取实际噪声信号对应的实际传递至耳膜处的噪声强度；判断实际传递至耳膜处的噪声强度是否大于或等于预设噪声值。这样，为主动降噪耳机在实际传递至耳膜处的噪声强度较大时，才进行实时降噪提供了基础，从而能够降低功耗。In addition, before real-time noise reduction based on the actual noise signal, the method further includes: obtaining the intensity of the noise actually transmitted to the eardrum corresponding to the actual noise signal; and determining whether the intensity of the noise actually transmitted to the eardrum is greater than or equal to a preset noise value. In this way, it provides a basis for real-time noise reduction for active noise reduction headphones when the intensity of the noise actually transmitted to the eardrum is large, thereby reducing power consumption.
另外，主动降噪方法还包括：获取耳机的产品参数信息；根据耳机的产品参数信息，设置实时降噪的工作时钟。这样，不仅能够保证耳机的良好播放质量，而且能够降低功耗。In addition, the active noise reduction method also includes: obtaining product parameter information of the headset; and setting a working clock for real-time noise reduction according to the product parameter information of the headset. In this way, not only the good playback quality of the headphones can be guaranteed, but also the power consumption can be reduced.
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表 示为类似的元件，除非有特别申明，附图中的图不构成比例限制。One or more embodiments are exemplified by the pictures in the accompanying drawings. These exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the drawings in the drawings do not constitute a limitation on scale.
图1是根据本申请第一实施例中的主动降噪方法的流程图；1 is a flowchart of an active noise reduction method according to a first embodiment of the present application;
图2是根据本申请第一实施例中主动降噪耳机的功能模块示意图；2 is a schematic diagram of a functional module of an active noise reduction earphone according to the first embodiment of the present application;
图3是根据本申请第一实施例中噪声控制单元12的功能模块示意图；FIG. 3 is a schematic diagram of functional modules of the noise control unit 12 according to the first embodiment of the present application;
图4是根据本申请第三实施例中的主动降噪方法的流程图；4 is a flowchart of an active noise reduction method according to a third embodiment of the present application;
图5是根据本申请第五实施例中的主动降噪耳机的结构示意图。FIG. 5 is a schematic structural diagram of an active noise reduction earphone according to a fifth embodiment of the present application.
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请部分实施例进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。In order to make the purpose, technical solution, and advantages of the present application clearer, some embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.
本申请第一实施例涉及一种主动降噪方法，具体流程如图1所示。本实施例中的主动降噪方法在主动降噪耳机上进行实施，主动降噪耳机包括：至少一个处理器、与至少一个处理器通信连接的声音采集设备、以及与至少一个处理器通信连接的存储器；其中，声音采集设备位于耳机的外壳，用于获取外部噪声信号；存储器存储有可被至少一个处理器执行的指令，指令被至少一个处理器执行，以使至少一个处理器能够执行本实施例中的主动降噪方法。The first embodiment of the present application relates to an active noise reduction method. The specific process is shown in FIG. 1. The active noise reduction method in this embodiment is implemented on an active noise reduction headset. The active noise reduction headset includes at least one processor, a sound collection device communicatively connected to the at least one processor, and a communication connection connected to the at least one processor. Memory; wherein the sound collection device is located in the shell of the headset and used to obtain external noise signals; the memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor to enable the at least one processor to execute the implementation Active noise reduction method in the example.
以下对本实施例中的主动降噪方法进行具体说明，步骤如下：The active noise reduction method in this embodiment is described in detail below. The steps are as follows:
步骤101，播放音频时，获取泄漏音频信号，并通过位于耳机外壳的声音采集设备获取外部噪声信号。In step 101, when audio is played, a leaked audio signal is obtained, and an external noise signal is obtained through a sound collection device located in a headphone shell.
具体地说，耳机外壳的声音采集设备可以为麦克风或者麦克风阵列。其中，所需播放的音频的音频播放信号对于主动降噪耳机而言是已知的信息，因 此主动降噪耳机获取泄漏音频信号的方式可以为：主动降噪耳机获取音频的音频播放信号，并获取泄漏传递函数，以便于根据泄漏传递函数以及音频播放信号，获取泄漏音频信号。Specifically, the sound collection device of the earphone shell may be a microphone or a microphone array. Among them, the audio playback signal of the audio to be played is known information for the active noise reduction headphones. Therefore, the way for the active noise reduction headphones to obtain the leaked audio signal can be: the active noise reduction headphones obtain the audio audio playback signals, and Obtain a leaked transfer function, so as to obtain a leaked audio signal according to the leaked transfer function and the audio playback signal.
更具体地说，技术人员可以预先使用专业仪器(如，频率响应分析仪)，测量获取主动降噪耳机的泄漏传递函数，并将所获取的泄漏传递函数预先存储在主动降噪耳机的存储器中，以便于主动降噪耳机获取泄漏传递函数。More specifically, a technician can use a professional instrument (such as a frequency response analyzer) in advance to measure and obtain the leakage transfer function of the active noise reduction headset, and store the obtained leakage transfer function in the memory of the active noise reduction headset in advance. , So that the active noise-cancelling headphones can obtain the leakage transfer function.
需要注意的是，假设泄漏传递函数记为H，音频播放信号记为M，泄漏音频信号记为n
music，则可以根据公式n
music＝M*H，计算获取泄漏音频信号。
It should be noted that if the leaked transfer function is recorded as H, the audio playback signal is recorded as M, and the leaked audio signal is recorded as n music , the leaked audio signal can be calculated and obtained according to the formula n music = M * H.
步骤102，滤除外部噪声信号中的泄漏音频信号，获取实际噪声信号。Step 102: Filter out the leaked audio signal in the external noise signal to obtain the actual noise signal.
具体地说，假设实际噪声信号记为n
ref，外部噪声信号记为n
mic，则实际噪声信号、泄漏音频信号与外部噪声信号的关系符合如下公式：
Specifically, assuming that the actual noise signal is recorded as n ref and the external noise signal is recorded as n mic , the relationship between the actual noise signal, the leaked audio signal, and the external noise signal conforms to the following formula:
n
ref＝n
mic-M*H。
n ref = n mic -M * H.
更具体地说，n
music＝M*H，主动降噪耳机获取的泄漏音频信号可以为数字域的n
music，并且，主动降噪耳机可以设有模数转换器件以及滤波器，以便于主动降噪耳机利用模数转换器件把采集到的外部噪声信号转换为数字域的n
mic，并使用上述公式n
ref＝n
mic-M*H，获取数字域的实际噪声信号n
ref。其中，主动降噪耳机在获取数字域的实际噪声信号n
ref时，可以将数字域的泄漏音频信号n
music以及数字域的n
mic发送至滤波器进行滤波，从而获取实际噪声信号n
ref。
More specifically, n music = M * H, the leaked audio signal obtained by the active noise reduction headphones may be n music in the digital domain, and the active noise reduction headphones may be provided with an analog-to-digital conversion device and a filter to facilitate active noise reduction. The noise earphone uses an analog-to-digital conversion device to convert the collected external noise signal into n mic in the digital domain, and uses the above formula n ref = n mic -M * H to obtain the actual noise signal n ref in the digital domain. Among them, when the active noise reduction headset obtains the actual noise signal n ref in the digital domain, it can send the leaked audio signal n music in the digital domain and n mic in the digital domain to a filter for filtering to obtain the actual noise signal n ref .
需要注意的是，模数转换器件可以为数字信号处理DSP(Digital Signal Processing，简称“DSP”)器件、现场可编程逻辑门阵列FPGA(Field Programmable Gate Array，简称“FPGA”)器件、特定用途集成电路ASIC器件(Application Specific Integrated Circuit，简称“ASIC”)等，滤波器可以为FIR(Finite Impulse Response，简称“FIR”)滤波器，也可以为IIR(Infinite Impulse Response，简称“IIR”)滤波器。并且，现有技术中的主动降噪耳机一般都设有滤波器，因而技术人员可以直接使用主动降噪耳机原有的滤波器进行泄漏音频信号的滤除，也可以单独增设一滤波器进行泄漏音频信号的滤除。本实施例并不对此做任何限定。It should be noted that the analog-to-digital conversion device can be a Digital Signal Processing (DSP) device, a Field Programmable Gate Array (FPGA) device, or a special-purpose integration. Circuit ASIC device (Application Specific Integrated Circuit (referred to as "ASIC"), etc., the filter can be FIR (Finite Impulse Response (FIR)) filter, or IIR (Infinite Impulse Response (IIR)) . In addition, in the prior art, active noise-cancelling earphones are generally provided with filters, so technicians can directly use the original filters of active noise-cancelling earphones to filter out leaked audio signals, or they can add a separate filter for leakage. Filtering of audio signals. This embodiment does not limit this in any way.
步骤103，基于实际噪声信号进行实时降噪。Step 103: Perform real-time noise reduction based on the actual noise signal.
具体地说，主动降噪耳机对实际噪声信号进行反相后，与播放音频进行叠加，从而实现主动降噪。Specifically, the active noise reduction headset inverts the actual noise signal and superimposes it with the playback audio to achieve active noise reduction.
以下以主动降噪耳机为前馈式主动降噪耳机为例，从功能模块的角度对主动降噪耳机实现本实施例中主动降噪方法进行说明：The following uses active noise reduction headphones as a feedforward active noise reduction headphones as an example to describe the method for implementing active noise reduction in active noise reduction headphones in this embodiment from the perspective of a functional module:
如图2所示，主动降噪耳机包括：声音采集设备11、噪声控制单元12、音频接收单元13、反向噪声生成单元14、误差处理单元15、扬声器***16、误差麦克风采集单元17。其中，声音采集设备11位于耳机外壳，用于获取外部噪声信号。噪声控制单元12用于对外部噪声信号进行处理，滤除外部噪声信号中的泄漏音频信号，获取较为纯净、接近真实情况的实际噪声信号。音频接收单元13用于接收音频播放信号。反向噪声生成单元14用于对实际噪声信号进行反向，以便于反向后的信号与音频获取单元13获取的音频播放信号进行叠加，获取抗噪音频信号。扬声器***16位于耳机内部，用于播放抗噪音频信号。误差麦克风采集单元17位于耳机内部，用于拾取扬声器***16实际播放的声音和噪声(这里的噪声是指外界噪声泄漏到耳机内部那部分噪声202)抵消后 的音频信号，以便于令误差处理单元15产生一个误差信号，并将误差信号传输给反向噪声生成单元14，令反向噪声生成单元14根据误差信号，得到更加准确的抗噪音频信号。其中，虚线201表示噪声2到声音采集设备11的传播路径，202表示噪声2到人耳膜的传输路径，203表示扬声器***16到声音采集设备11的泄漏路径。As shown in FIG. 2, the active noise reduction headset includes: a sound collection device 11, a noise control unit 12, an audio receiving unit 13, a reverse noise generation unit 14, an error processing unit 15, a speaker system 16, and an error microphone collection unit 17. Wherein, the sound collection device 11 is located in the earphone shell, and is used to obtain an external noise signal. The noise control unit 12 is configured to process an external noise signal, filter out a leaked audio signal in the external noise signal, and obtain an actual noise signal that is relatively pure and close to a real situation. The audio receiving unit 13 is configured to receive an audio playback signal. The reverse noise generating unit 14 is configured to reverse the actual noise signal, so that the reversed signal is superimposed on the audio playback signal obtained by the audio acquisition unit 13 to obtain an anti-noise frequency signal. The speaker system 16 is located inside the earphone and is used for playing anti-noise frequency signals. The error microphone acquisition unit 17 is located inside the headset and is used to pick up the audio signal that is actually played by the speaker system 16 (the noise here refers to the part of the noise 202 leaking to the inside of the headset), so that the error processing unit 15 generates an error signal and transmits the error signal to the reverse noise generating unit 14, so that the reverse noise generating unit 14 obtains a more accurate anti-noise frequency signal according to the error signal. Among them, the dashed line 201 indicates the propagation path of Noise 2 to the sound collection device 11, 202 indicates the transmission path of Noise 2 to the human eardrum, and 203 indicates the leakage path of the speaker system 16 to the sound collection device 11.
其中，声音采集设备11、误差麦克风采集单元17的功能可以由传统意义上的麦克风(可以是模拟麦克风也可以是数字麦克风)实现，噪声控制单元12、音频接收单元13、反向噪声生成单元14、误差处理单元15的功能可以利用数字器件实现，如，DSP、FPGA、微控制单元MCU(Microcontroller Unit，简称“MCU”)等。Among them, the functions of the sound collection device 11 and the error microphone collection unit 17 can be implemented by a traditional microphone (which can be an analog microphone or a digital microphone). The noise control unit 12, the audio receiving unit 13, and the reverse noise generating unit 14 The functions of the error processing unit 15 can be realized by digital devices, such as DSP, FPGA, MCU (Microcontroller Unit, "MCU" for short) and so on.
本实施例中，可以认为噪声控制单元12包含以下子单元：音频播放检测子单元121、泄漏信号获取单元122以及泄露信号消除单元123。音频播放检测子单元121用于检测扬声器***16的状态，判断扬声器***16是否在播放音频。若扬声器***16在播放音频，则泄漏信号获取单元122获取泄漏音频信号，以便泄露信号消除单元123滤除外部噪声信号中的泄漏音频信号。In this embodiment, the noise control unit 12 may be considered to include the following sub-units: an audio playback detection sub-unit 121, a leakage signal acquisition unit 122, and a leakage signal elimination unit 123. The audio playback detection sub-unit 121 is configured to detect the state of the speaker system 16 and determine whether the speaker system 16 is playing audio. If the speaker system 16 is playing audio, the leakage signal acquisition unit 122 acquires the leakage audio signal, so that the leakage signal cancellation unit 123 filters out the leakage audio signal in the external noise signal.
需要注意的是，上述所举例的前馈式主动降噪耳机属于闭环路***，是通过反馈方式来达到降噪目的的，由于本申请中的反向噪声生成单元14是基于较为纯净、接近真实情况的实际噪声信号进行反相的，因此本申请中的主动降噪方法还可以解决现有技术中主动降噪耳机的不稳定问题，提高主动降噪耳机的稳定性。It should be noted that the above-mentioned feed-forward active noise-cancelling headphones belong to a closed-loop system and achieve the purpose of noise reduction through a feedback method. Since the reverse noise generating unit 14 in this application is based on a relatively pure and close to real The actual noise signal of the situation is inverted, so the active noise reduction method in this application can also solve the problem of instability of the active noise reduction headphones in the prior art, and improve the stability of the active noise reduction headphones.
本实施例相对于现有技术而言，主动降噪耳机在播放音频时，会获取泄漏音频信号，以便于根据所获取的泄漏音频信号，对声音采集设备所获取的外 部噪声信号进行处理，滤除外部噪声信号中的泄漏音频信号，从而获取更纯净的、更接近真实情况的实际噪声信号。这样，耳机便能够基于所获取的实际噪声信号进行实时降噪，从而尽可能地避免了因降噪所导致的音频受损的情况，能够提高播放质量。Compared with the prior art, in this embodiment, the active noise reduction headset acquires a leaked audio signal when playing audio, so as to process and filter the external noise signal acquired by the sound collection device according to the acquired leaked audio signal. Eliminate the leaked audio signal in the external noise signal, so as to obtain a purer and closer to the actual noise signal. In this way, the headset can perform real-time noise reduction based on the acquired actual noise signal, thereby avoiding as much as possible the audio damage caused by the noise reduction, and improving the playback quality.
需要强调的是，本实施例中所涉及到的各单元均为逻辑单元，在实际应用中，一个逻辑单元可以是一个物理单元，也可以是一个物理单元的一部分，还可以以多个物理单元的组合实现。此外，为了突出本发明的创新部分，本实施例中并没有将与解决本发明所提出的技术问题关系不太密切的单元引入，但这并不表明本实施例中不存在其它的单元。It should be emphasized that each unit involved in this embodiment is a logical unit. In practical applications, a logical unit may be a physical unit, or a part of a physical unit, or multiple physical units. Implementation of the combination. In addition, in order to highlight the innovative part of the present invention, in this embodiment, no unit that is not closely related to solving the technical problem proposed by the present invention is introduced, but this does not indicate that there are no other units in this embodiment.
本申请第二实施例涉及一种主动降噪方法。第二实施例与第一实施例大致相同，主要区别之处在于：泄漏传递函数的获取方式不同，以下进行具体说明：The second embodiment of the present application relates to an active noise reduction method. The second embodiment is substantially the same as the first embodiment, and the main difference is that the leak transfer function is obtained in different ways, which are described below in detail:
本实施例中，主动降噪耳机获取泄漏传递函数的方式为：主动降噪耳机采用最小均分算法LMS原理以及数组H
m(i)的初始设置，根据公式
公式err(m)＝n
music(m)-n'
music(m)以及公式H
m+1(i)＝H
m(i)+μS
music(m-N+i)*err(m)，将err(m)满足预设条件所对应的H
m(i)作为时刻m的泄漏传递函数；
In this embodiment, the way for the active noise-cancelling earphone to obtain the leakage transfer function is: the active noise-cancelling earphone uses the principle of minimum equalization algorithm LMS and the initial setting of the array H m (i), according to the formula The formula err (m) = n music (m) -n ' music (m) and the formula H m + 1 (i) = H m (i) + μS music (m-N + i) * err (m), err (m) satisfies H m (i) corresponding to the preset condition as the leakage transfer function at time m;
其中，n'
music(m)表示时刻m的预估泄漏音频信号；N为正整数；i表示N中的第i个数值；S
music(m-N+i)表示第m-N+i时刻音频播放信号的音频幅值；H
m(i)表示时刻m中的第i个泄漏传递函数；err(m)表示实际泄漏音频信号n
music(m)与预估泄漏音频信号n'
music(m)间的误差，μ表示更新步进。
Among them, n ' music (m) represents the estimated leaked audio signal at time m; N is a positive integer; i represents the i-th value in N; S music (m-N + i) represents the m-N + i moment Audio amplitude of the audio playback signal; H m (i) represents the ith leakage transfer function at time m; err (m) represents the actual leaked audio signal n music (m) and the estimated leaked audio signal n ' music (m ), Μ represents the update step.
需要注意的是，预设条件可以由技术人员预先设置，如，预设条件可以 为err(m)与n
music(m)的比值小于预设阈值，也可以为err(m)
2与n
music(m)
2的比值小于预设阈值。如，预设阈值可以为0.001。
It should be noted that the preset conditions can be set in advance by a technician. For example, the preset conditions can be that the ratio of err (m) to n music (m) is less than the preset threshold, or err (m) 2 and n music The ratio of (m) 2 is less than a preset threshold. For example, the preset threshold may be 0.001.
具体地说，N的值可以由技术人员预先设置并保存在主动降噪耳机中。其中，由于N的值设置的越大，主动降噪耳机的功耗越大，因此技术人员可以根据实际功耗需求设置N的值，如，N可以为40。Specifically, the value of N can be set in advance by a technician and stored in the active noise reduction headset. Wherein, the larger the value of N is, the larger the power consumption of the active noise-cancelling headphones is. Therefore, a technician can set the value of N according to actual power consumption requirements, for example, N can be 40.
本实施例中，主动降噪耳机利用最小均分算法LMS，对初始设置的H
m(i)进行不断修正，从而能够获取与当前实际情况最为匹配的H
m(i)。如，主动降噪耳机播放的音频可以为预设音频，以便于主动降噪耳机在播放预设音频时，能够进行H
m(i)的修正，从而获取与当前实际情况最为匹配的H
m(i)，供后续播放其他音频时使用。这样，不仅能够获取质量较佳的播放效果，而且能够令后续播放其他音频时不需要进行H
m(i)的修正，从而能够降低功耗。或者，主动降噪耳机播放的音频也可以为用户请求的音频，但主动降噪耳机在播放音频的一段时间内，对H
m(i)进行修正，也能获取质量较佳的播放效果，并达到降低功耗的目的。当然，主动降噪耳机也可以实时地对H
m(i)进行修正，从而能够提供当前耳机所能提供的最佳播放效果。本实施例并不对主动降噪耳机何时修正H
m(i)做任何限定。
In this embodiment, the active noise reduction earphone uses the minimum equalization algorithm LMS to continuously modify the initially set H m (i), so as to obtain the H m (i) that best matches the current actual situation. For example, the audio played by the active noise-cancelling headphones can be preset audio, so that when the active noise-cancelling headphones play the preset audio, H m (i) can be modified to obtain the H m (i.e. i) for subsequent playback of other audio. In this way, not only can a better-quality playback effect be obtained, but also the H m (i) correction need not be performed when other audios are subsequently played, thereby reducing power consumption. Alternatively, the audio played by the active noise-cancelling headphones can also be the audio requested by the user. However, the active noise-cancelling headphones can modify H m (i) within a period of time to play the audio, and can also obtain better-quality playback effects, and To achieve the purpose of reducing power consumption. Of course, the active noise-cancelling headphones can also modify H m (i) in real time, so as to provide the best playback effect that current headphones can provide. This embodiment does not make any limitation on when the active noise-cancelling headphones modify H m (i).
与第一实施例相比，本实施例中的主动降噪耳机能够获取当前情况下较为匹配的泄漏传递函数，为获取更准确地泄漏音频信号提供了基础，从而能够获取更接近真实情况的实际噪声信号，以便于进一步地提高播放质量。Compared with the first embodiment, the active noise-cancelling headphones in this embodiment can obtain a leakage matching function that is more suitable in the current situation, and provides a basis for obtaining a more accurate leaked audio signal, so that it can obtain an actual closer to the real situation. Noise signal to further improve playback quality.
本申请第三实施例涉及一种主动降噪方法，具体流程如图4所示。第三实施例在第一、第二实施例的基础上加以改进，主要改进之处在于：在本申请第三实施例中，主动降噪耳机在实际传递至耳膜处的噪声强度较大时，才进行 实时降噪，能够降低功耗。以下进行具体说明：The third embodiment of the present application relates to an active noise reduction method. The specific process is shown in FIG. 4. The third embodiment is improved on the basis of the first and second embodiments. The main improvement is that in the third embodiment of the present application, when the intensity of the noise actually transmitted to the eardrum by the active noise reduction earphone is large, Only real-time noise reduction can reduce power consumption. The specific description is as follows:
本实施例中的步骤301至步骤302与第一实施例中步骤101至步骤102大致相同，步骤305与第一实施例中步骤103大致相同，为减少重复，在此不再赘述，以下仅对不同部分进行说明： Steps 301 to 302 in this embodiment are substantially the same as steps 101 to 102 in the first embodiment, and step 305 is substantially the same as step 103 in the first embodiment. In order to reduce repetition, details are not repeated here. The different parts are explained:
步骤303，获取实际噪声信号对应的实际传递至耳膜处的噪声强度。Step 303: Acquire the noise intensity actually transmitted to the eardrum corresponding to the actual noise signal.
具体地说，主动降噪耳机获取实际噪声信号的频率信息以及强度信息，根据预设的噪声路径损耗信息、实际噪声信号的频率信息以及强度信息，计算实际传递至耳膜处的噪声强度。Specifically, the active noise reduction earphone obtains frequency information and intensity information of the actual noise signal, and calculates the noise intensity actually transmitted to the eardrum according to preset noise path loss information, frequency information and intensity information of the actual noise signal.
更具体地说，技术人员可以预先在专业设备上测量获取实际噪声信号的强度In
ref与实际传递至耳膜处的噪声强度In
ear之间的关系。其中，考虑到不同频率成分的实际噪声信号的强度的差异性，假设频率范围为[f
L,f
H]，技术人员可以使用线性调频或者对数调频的方式将频率范围[f
L,f
H]分割成若干份，并进行编号，即，确定若干个频点f，以便于获取不同频点上In
ear与In
ref的关系，并将获取的不同频点上In
ear与In
ref的关系作为本实施例中的噪声路径损耗信息NPL
f(其中，NPL为噪声路径损耗Noise Path Loss的简写)。
More specifically, a technician can measure the relationship between the intensity of the actual noise signal In ref and the intensity of the noise actually transmitted to the eardrum In ear on a professional device in advance. Among them, considering the difference in the strength of the actual noise signal with different frequency components, assuming that the frequency range is [f L , f H ], the technician can use linear or logarithmic frequency modulation to change the frequency range [f L , f H ] is divided into several parts, and are numbered, i.e., determining a plurality of frequency F, so that the relationship between in and in REF in ear get different frequency point, the relationship between in and in REF ear on different frequency points as the acquired Noise path loss information NPL f (where NPL is short for Noise Path Loss).
更具体地说，假设NPL
f为不同频点处实际噪声信号的强度In
ref与实际传递至耳膜处的噪声强度In
ear之间比值，则NPL
f等于
由于NPL
f作为噪声路径损耗信息预先存储在主动降噪耳机中，因此In
ear等于
从而可以实现获取实际噪声信号对应的实际传递至耳膜处的噪声强度。
More specifically, assuming that NPL f is the ratio between the intensity of the actual noise signal In ref at different frequency points and the intensity of the noise actually transmitted to the eardrum In ear , then NPL f is equal to Since NPL f is stored in the active noise reduction headphones as noise path loss information in advance, In ear is equal to Thereby, it is possible to obtain the intensity of the noise actually transmitted to the eardrum corresponding to the actual noise signal.
需要注意的是，f
L以及f
H可以由技术人员根据实际需求进行选择，如，技术人员可以根据耳机特性以及降噪指标选择f
L以及f
H。
It should be noted that f L and f H can be selected by a technician according to actual needs. For example, the technician can select f L and f H according to the characteristics of the headset and the noise reduction index.
步骤304，判断实际传递至耳膜处的噪声强度是否大于或等于预设噪声 值。若步骤304的输出结果为是，则执行步骤305，若步骤304的输出结果为否，则结束本流程。Step 304: Determine whether the intensity of the noise actually transmitted to the eardrum is greater than or equal to a preset noise value. If the output result of step 304 is YES, step 305 is performed, and if the output result of step 304 is no, then this process ends.
具体地说，预设噪声值由技术人员预先输入并保存在主动降噪耳机中，如，技术人员可以根据人耳舒适度设置预设噪声值，如，预设噪声值可以设置为小于或等于15分贝。Specifically, the preset noise value is input by a technician in advance and stored in the active noise reduction headset. For example, the technician can set the preset noise value according to the comfort of the human ear. For example, the preset noise value can be set to be less than or equal to 15 decibels.
与第一、第二实施例相比，本实施例相当于为主动降噪耳机设置了两个工作模式：节能模式(不进行实时降噪)、降噪模式(进行实时降噪)。这样，主动降噪耳机根据实际传递至耳膜处的噪声强度来确定工作模式，能够降低功耗，延长同等电量下便携设备单次充电的使用时间。Compared with the first and second embodiments, this embodiment is equivalent to setting two working modes for an active noise reduction headset: an energy saving mode (without real-time noise reduction), and a noise reduction mode (with real-time noise reduction). In this way, the active noise reduction earphone determines the working mode according to the intensity of the noise actually transmitted to the eardrum, which can reduce power consumption and extend the use time of a single charge of the portable device under the same power.
本申请第四实施例涉及一种主动降噪方法。第四实施例在第一、第二或第三实施例的基础上加以改进，主要改进之处在于：在本申请第四实施例中，主动降噪耳机还根据耳机的实际情况对某些时钟参数进行设置，不仅能够保证耳机的良好播放质量，而且能够降低功耗。以下进行具体说明：The fourth embodiment of the present application relates to an active noise reduction method. The fourth embodiment is improved on the basis of the first, second, or third embodiment. The main improvement is that in the fourth embodiment of the present application, the active noise reduction headset also adjusts some clocks according to the actual situation of the headset. Setting parameters can not only ensure good playback quality of the headphones, but also reduce power consumption. The specific description is as follows:
具体地说，主动降噪耳机还获取耳机的产品参数信息，根据耳机的产品参数信息，设置实时降噪的工作时钟。其中，耳机的产品参数信息包括以下信息的其中之一或任意组合：设备形态、供电方式。Specifically, the active noise reduction headset also obtains product parameter information of the headset, and sets a working clock for real-time noise reduction according to the product parameter information of the headset. Among them, the product parameter information of the headset includes one or any combination of the following information: device form, power supply method.
更具体地说，不同设备形态的耳机(如，头戴式耳机、入耳式耳机)，其噪声传递至人耳膜处的时间是不同的。并且，不同供电方式的耳机(如，电池供电、外接设备供电)，其对功耗的要求也是不同的。因此，主动降噪耳机可以根据耳机的设备形态，设置实时降噪的工作时钟，令噪声传递到耳膜处的时间越长的耳机对应的工作时钟越小，从而降低功耗，延长同等电量下便携设备单次充电的使用时间。或者，主动降噪耳机可以根据耳机的供电状态，设置 实时降噪的工作时钟，令电池供电的耳机对应的工作时钟越小，从而降低功耗，延长同等电量下便携设备单次充电的使用时间。More specifically, the earphones of different device forms (for example, headphones and in-ear headphones) have different times when noise is transmitted to the eardrum of a human. In addition, the earphones of different power supply modes (for example, battery power supply and external device power supply) have different requirements on power consumption. Therefore, according to the device form of the headset, the active noise reduction headset can set a working clock for real-time noise reduction, so that the longer the noise is transmitted to the eardrum, the smaller the corresponding working clock of the headset, thereby reducing power consumption and extending portability under the same power. Device usage time on a single charge. Alternatively, according to the power supply status of the headset, the active noise reduction headset can set a working clock for real-time noise reduction, so that the working clock corresponding to the battery-powered headset is smaller, thereby reducing power consumption and extending the use time of a single charge of the portable device under the same power. .
本实施例相比于上述实施例而言，主动降噪耳机根据耳机的产品参数信息设置实时降噪的工作时钟，不仅能够保证耳机的良好播放质量，而且能够降低功耗。Compared with the above embodiment, the active noise reduction headset in this embodiment sets a working clock for real-time noise reduction according to the product parameter information of the headset, which can not only ensure good playback quality of the headset, but also reduce power consumption.
本申请第五实施例涉及一种主动降噪耳机，如图5所示，包括：至少一个处理器、与至少一个处理器通信连接的声音采集设备、以及与至少一个处理器通信连接的存储器；其中，声音采集设备位于耳机的外壳，用于获取外部噪声信号；存储器存储有可被至少一个处理器执行的指令，指令被至少一个处理器执行，以使至少一个处理器能够执行上述方法实施例中的主动降噪方法。A fifth embodiment of the present application relates to an active noise-cancelling earphone, as shown in FIG. 5, including: at least one processor, a sound acquisition device communicatively connected to the at least one processor, and a memory communicatively connected to the at least one processor; The sound collection device is located in the shell of the headset and is used to obtain external noise signals. The memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor to enable the at least one processor to execute the foregoing method embodiment Active noise reduction method in.
其中，存储器402和处理器401采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器401和存储器402的各种电路连接在一起。处理器401负责管理总线和通常的处理，还可以提供各种功能，包括定时，***接口，电压调节、电源管理以及其他控制功能。而存储器402可以被用于存储处理器401在执行操作时所使用的数据。The memory 402 and the processor 401 are connected in a bus manner. The bus may include any number of interconnected buses and bridges. The bus connects one or more processors 401 and various circuits of the memory 402 together. The processor 401 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 402 may be used to store data used by the processor 401 when performing operations.
本发明实施例相当于现有技术而言，耳机能够基于更纯净、更接近真实情况的实际噪声信号进行主动降噪，以提高播放质量。The embodiment of the present invention is equivalent to the prior art. The earphone can actively reduce noise based on an actual noise signal that is more pure and closer to the real situation to improve playback quality.
本发明第六实施例涉及一种计算机可读存储介质，存储有计算机程序。计算机程序被处理器执行时实现上述方法实施例。A sixth embodiment of the present invention relates to a computer-readable storage medium storing a computer program. When the computer program is executed by the processor, the above method embodiment is implemented.
本发明实施例相当于现有技术而言，耳机能够基于更纯净、更接近真实情况的实际噪声信号进行主动降噪，以提高播放质量。The embodiment of the present invention is equivalent to the prior art. The earphone can actively reduce noise based on an actual noise signal that is more pure and closer to the real situation to improve playback quality.
本领域的普通技术人员可以理解，上述各实施例是实现本申请的具体实 施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。Those of ordinary skill in the art can understand that the foregoing embodiments are specific embodiments for implementing the present application, and in practical applications, various changes can be made in form and details without departing from the spirit and range.
Claims (10)
- 一种主动降噪方法，其特征在于，包括：An active noise reduction method, comprising:播放音频时，获取泄漏音频信号，并通过位于耳机外壳的声音采集设备获取外部噪声信号；When playing audio, obtain leaked audio signals and obtain external noise signals through a sound collection device located in the headphone housing;滤除所述外部噪声信号中的所述泄漏音频信号，获取实际噪声信号；Filtering the leaked audio signal from the external noise signal to obtain an actual noise signal;基于所述实际噪声信号进行实时降噪。Real-time noise reduction is performed based on the actual noise signal.
- 如权利要求1所述的主动降噪方法，其特征在于，所述获取泄漏音频信号，包括：The active noise reduction method according to claim 1, wherein the acquiring a leaked audio signal comprises:获取所述音频的音频播放信号；Obtaining an audio playback signal of the audio;获取泄漏传递函数，并根据所述泄漏传递函数以及所述音频播放信号，获取所述泄漏音频信号。A leak transfer function is obtained, and the leak audio signal is obtained according to the leak transfer function and the audio playback signal.
- 如权利要求2所述的主动降噪方法，其特征在于，所述获取泄漏传递函数，包括：The active noise reduction method according to claim 2, wherein the obtaining a leakage transfer function comprises:采用最小均分算法LMS原理以及数组H m(i)的初始设置，根据公式公式err(m)＝n music(m)-n' music(m)以及公式H m+1(i)＝H m(i)+μS music(m-N+i)*err(m)，将所述err(m)满足预设条件所对应的H m(i)作为时刻m的所述泄漏传递函数的值； Using the principle of the least equal division algorithm LMS and the initial setting of the array H m (i), according to the formula
The formula err (m) = n music (m) -n ' music (m) and the formula H m + 1 (i) = H m (i) + μS music (m-N + i) * err (m), That err (m) satisfies H m (i) corresponding to a preset condition as a value of the leakage transfer function at time m;其中，n' music(m)表示时刻m的预估泄漏音频信号；N为正整数；i表示N中的第i个数值；S music(m-N+i)表示第m-N+i时刻所述音频播放信号的音频幅值；H m(i)表示时刻m中的第i个泄漏传递函数的值；err(m)表示实际泄漏音频信号n music(m)与预估泄漏音频信号n' music(m)间的误差，μ表示更新步进。 Among them, n ' music (m) represents the estimated leaked audio signal at time m; N is a positive integer; i represents the i-th value in N; S music (m-N + i) represents the m-N + i moment Audio amplitude of the audio playback signal; H m (i) represents the value of the ith leakage transfer function at time m; err (m) represents the actual leaked audio signal n music (m) and the estimated leaked audio signal n ' Music (m) error, μ means update step. - 如权利要求3所述主动降噪方法，其特征在于，所述预设条件为err(m)与n music(m)的比值小于预设阈值；或者，所述预设条件为err(m) 2与n music(m) 2的比值小于预设阈值。 The active noise reduction method according to claim 3, wherein the preset condition is that a ratio of err (m) to n music (m) is smaller than a preset threshold; or the preset condition is err (m) The ratio of 2 to n music (m) 2 is less than a preset threshold.
- 如权利要求1所述的主动降噪方法，其特征在于，所述基于所述实际噪声信号进行实时降噪前，还包括：The active noise reduction method according to claim 1, before the real-time noise reduction based on the actual noise signal, further comprising:获取所述实际噪声信号对应的实际传递至耳膜处的噪声强度；Acquiring the intensity of the noise actually transmitted to the eardrum corresponding to the actual noise signal;判断所述实际传递至耳膜处的噪声强度是否大于或等于预设噪声值。Determine whether the intensity of the noise actually transmitted to the eardrum is greater than or equal to a preset noise value.
- 如权利要求5所述的主动降噪方法，其特征在于，所述获取所述实际噪声信号对应的实际传递至耳膜处的噪声强度，具体包括：The active noise reduction method according to claim 5, wherein the acquiring the intensity of the noise actually transmitted to the eardrum corresponding to the actual noise signal specifically comprises:获取所述实际噪声信号的频率信息以及强度信息；Acquiring frequency information and intensity information of the actual noise signal;根据预设的噪声路径损耗信息、所述实际噪声信号的频率信息以及强度信息，计算所述实际传递至耳膜处的噪声强度。According to preset noise path loss information, frequency information and intensity information of the actual noise signal, calculate the intensity of the noise actually transmitted to the eardrum.
- 如权利要求5或6所述的主动降噪方法，其特征在于，所述预设噪声值小于或等于15分贝。The active noise reduction method according to claim 5 or 6, wherein the preset noise value is less than or equal to 15 decibels.
- 如权利要求1所述的主动降噪方法，其特征在于，还包括：The active noise reduction method according to claim 1, further comprising:获取所述耳机的产品参数信息；Obtaining product parameter information of the headset;根据所述耳机的产品参数信息，设置所述实时降噪的工作时钟。Set the real-time noise reduction working clock according to the product parameter information of the headset.
- 如权利要求8所述的主动降噪方法，其特征在于，所述耳机的产品参数信息包括以下信息的其中之一或任意组合：设备形态、供电方式。The active noise reduction method according to claim 8, wherein the product parameter information of the earphone includes one or any combination of the following information: device form and power supply mode.
- 一种主动降噪耳机，其特征在于，包括：至少一个处理器、与所述至少一个处理器通信连接的声音采集设备、以及与所述至少一个处理器通信连接的存储器；其中，An active noise reduction headset, comprising: at least one processor, a sound collection device communicatively connected to the at least one processor, and a memory communicatively connected to the at least one processor; wherein,所述声音采集设备位于耳机的外壳，用于获取外部噪声信号；The sound collection device is located in a casing of the earphone, and is configured to obtain an external noise signal;所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如权利要求1至9中任一项所述的主动降噪方法。The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method as claimed in any one of claims 1 to 9. The active noise reduction method described above.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201880001602.5A CN109314814B (en) | 2018-09-11 | 2018-09-11 | Active noise reduction method and earphone |
| PCT/CN2018/105035 WO2020051769A1 (en) | 2018-09-11 | 2018-09-11 | Active noise cancelling method and headset |
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| PCT/CN2018/105035 WO2020051769A1 (en) | 2018-09-11 | 2018-09-11 | Active noise cancelling method and headset |
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| WO2020051769A1 true WO2020051769A1 (en) | 2020-03-19 |
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| PCT/CN2018/105035 WO2020051769A1 (en) | 2018-09-11 | 2018-09-11 | Active noise cancelling method and headset |
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| CN (1) | CN109314814B (en) |
| WO (1) | WO2020051769A1 (en) |
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| CN111757211B (en) * | 2020-07-23 | 2022-07-22 | 歌尔科技有限公司 | Noise reduction method, terminal device and storage medium |
| CN112002070B (en) * | 2020-09-03 | 2022-03-22 | 安声(重庆)电子科技有限公司 | Sharing method and sharing terminal of noise reduction earphone |
| CN111935589B (en) * | 2020-09-28 | 2021-02-12 | 深圳市汇顶科技股份有限公司 | Active noise reduction method and device, electronic equipment and chip |
| CN113132846B (en) * | 2021-04-13 | 2024-05-10 | 北京安声科技有限公司 | Active noise reduction method and device for earphone and semi-in-ear active noise reduction earphone |
| WO2024119397A1 (en) * | 2022-12-07 | 2024-06-13 | 深圳市韶音科技有限公司 | Open wearable acoustic device and active noise cancellation method |
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| CN109314814B (en) | 2020-11-27 |
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