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WO2020051769A1 - Procédé de suppression active de bruit et casque d'écoute - Google Patents

Procédé de suppression active de bruit et casque d'écoute Download PDF

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Publication number
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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WO
WIPO (PCT)
Prior art keywords
noise
signal
noise reduction
active noise
audio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/105035
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English (en)
Chinese (zh)
Inventor
王鑫山
李国梁
朱虎
郭红敬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Goodix Technology Co Ltd
Original Assignee
Shenzhen Goodix Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Goodix Technology Co Ltd filed Critical Shenzhen Goodix Technology Co Ltd
Priority to PCT/CN2018/105035 priority Critical patent/WO2020051769A1/fr
Priority to CN201880001602.5A priority patent/CN109314814B/zh
Publication of WO2020051769A1 publication Critical patent/WO2020051769A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Headphones And Earphones (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

La présente invention se rapporte au domaine des techniques de suppression de bruit. La présente invention concerne un procédé de suppression active de bruit et un casque d'écoute. Le procédé de suppression active du bruit comprend les étapes suivantes consistant à : lors de la lecture d'un fichier audio, acquérir une fuite de signal audio, et utiliser un appareil de collecte de son positionné au niveau d'un boîtier d'un casque d'écoute pour acquérir des signaux de bruit externe (101) ; éliminer la fuite de signal audio des signaux de bruit externe pour acquérir des signaux de bruit réels (102) ; et effectuer une suppression de bruit en temps réel en fonction des signaux de bruit réels (103). La mise en œuvre d'un mode de réalisation de la présente invention permet à un casque d'écoute d'effectuer une suppression active de bruit sur la base de signaux de bruit réels qui reflètent des scénarios réels, améliorant ainsi la qualité de lecture.
PCT/CN2018/105035 2018-09-11 2018-09-11 Procédé de suppression active de bruit et casque d'écoute Ceased WO2020051769A1 (fr)

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PCT/CN2018/105035 WO2020051769A1 (fr) 2018-09-11 2018-09-11 Procédé de suppression active de bruit et casque d'écoute
CN201880001602.5A CN109314814B (zh) 2018-09-11 2018-09-11 主动降噪方法及耳机

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