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WO2011153779A1 - Procédé et terminal pour suppression de bruit à l'aide de deux microphones - Google Patents

Procédé et terminal pour suppression de bruit à l'aide de deux microphones Download PDF

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Publication number
WO2011153779A1
WO2011153779A1 PCT/CN2010/078093 CN2010078093W WO2011153779A1 WO 2011153779 A1 WO2011153779 A1 WO 2011153779A1 CN 2010078093 W CN2010078093 W CN 2010078093W WO 2011153779 A1 WO2011153779 A1 WO 2011153779A1
Authority
WO
WIPO (PCT)
Prior art keywords
microphone
terminal
noise
control chip
main control
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/CN2010/078093
Other languages
English (en)
Chinese (zh)
Inventor
刘斌
佘海波
董玲玲
刘凤鹏
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.)
ZTE Corp
Original Assignee
ZTE Corp
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 ZTE Corp filed Critical ZTE Corp
Publication of WO2011153779A1 publication Critical patent/WO2011153779A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and a terminal for suppressing noise using a dual microphone.
  • the method for suppressing the background noise of the call is mainly: using a special noise suppression chip, the main microphone for calling and the reference microphone for collecting noise are connected to the noise suppression chip, and the voice is suppressed after the noise suppression processing is performed inside the noise suppression chip.
  • the signal is transmitted to the terminal main chip.
  • the noise suppression chip is expensive, and has many interfaces, and needs to be configured with an I2C interface, a crystal, various RCs, and matching circuits, which will occupy a large amount of space on the motherboard, and take There are many lines, not only the cost rises, but also makes the motherboard layout line a bottleneck, which greatly limits the application of the program on many communication terminals such as mobile phones.
  • a primary object of the present invention is to provide a method and a terminal for suppressing noise by using a dual microphone, which can effectively reduce the communication background noise and reduce the wiring space of the motherboard, thereby effectively saving hardware costs.
  • the present invention provides a method of suppressing noise using a dual microphone, which includes: Detecting the current call state of the terminal, determining whether the terminal enters the headset call state; when the terminal enters the non-headphone call state, selecting an audio channel for the primary microphone and the reference microphone by means of time division multiplexing; collecting the call voice through the primary microphone and passing the reference microphone Collecting background noise; and using background noise to perform noise suppression processing on noise in the call sound.
  • the method further includes: accessing the reference microphone to the main control chip.
  • the method further includes: when the terminal enters the headset call state, the headset microphone is connected to the main control chip; the audio channel is selected for the headset microphone; The microphone collects the call sound.
  • the manner of performing the noise suppression processing includes: using a corresponding noise suppression processing algorithm according to the type of the microphone.
  • the present invention also provides a terminal for suppressing noise by using a dual microphone, comprising a main control chip, a main microphone connected to the main control chip, and a reference microphone, wherein the main control chip includes: a detection module, which is configured as: a detection terminal The current call state determines whether the terminal enters the headset call state; the switch module is configured to: when the terminal enters the non-headphone call state, select an audio channel for the main microphone and the reference microphone by means of time division multiplexing; For: collecting the call sound through the main microphone, and collecting the background noise through the reference microphone; and the noise suppression processing module, which is set to: perform noise suppression on the noise in the call sound by using the background noise when the terminal enters the non-phone headset state deal with.
  • a detection module which is configured as: a detection terminal The current call state determines whether the terminal enters the headset call state
  • the switch module is configured to: when the terminal enters the non-headphone call state, select an audio channel for the main microphone and the reference microphone by means of time division
  • the terminal further includes a selection switch, which is respectively connected to the main control chip and the reference microphone.
  • the selection switch is configured to: when the terminal enters the non-headphone conversation state, select an audio channel for the main microphone and the reference microphone by time division multiplexing. Previously, the reference microphone was connected to the main control chip.
  • the terminal further includes a headset microphone; the selection switch is further connected to the headset microphone, and the selection switch is further configured to: when the terminal enters the headset call state, the headset microphone is connected to the main control chip; To: Select an audio channel for the headset microphone; the collection module is further configured to: collect the call sound through the headset microphone.
  • the manner of performing the noise suppression processing includes: using a corresponding noise suppression processing algorithm according to the type of the microphone.
  • the main control chip is provided with a first microphone interface and a second microphone interface; the main microphone is connected to the main control chip through the first microphone interface; the selection switch passes the reference microphone or the earphone microphone through the second The microphone interface is selected to access the main control chip.
  • the main control chip is a baseband processor main control chip or an audio processing chip.
  • the method for using the dual microphone to suppress noise and the terminal through the terminal's own main control chip and the selection switch connected to the main control chip use the time division multiplexing method to collect the call sound of the main microphone and the call noise of the reference microphone to perform noise. Suppression processing, the device has a simple structure, can effectively suppress the background noise of the call, reduce the wiring space of the motherboard, and save hardware costs.
  • FIG. 1 is a schematic flow chart of an embodiment of a method for suppressing noise using dual microphones according to the present invention
  • FIG. 2 is a schematic flow chart of another embodiment of a method for suppressing noise using dual microphones according to the present invention
  • Schematic diagram of an embodiment of a terminal 4 is a schematic diagram showing the specific structure of the main control chip in the terminal using the dual microphone suppression noise shown in FIG. 3
  • FIG. 5 is a schematic diagram showing the circuit connection of the terminal using the dual microphone suppression noise according to the present invention.
  • FIG. 1 is a flow chart showing an embodiment of a method for suppressing noise using dual microphones according to the present invention. As shown in FIG.
  • a method for suppressing noise by using a dual microphone includes: Step 101: detecting a current call state of the terminal, determining whether the terminal enters a headset call state; the terminal first detecting a current call state, and detecting the manner thereof Specifically, the terminal is inserted into the terminal, and if the headset is inserted into the terminal, the terminal enters the headset call state, and the headset communicates with the headset; if no headset is inserted into the terminal, the terminal indicates that the terminal performs the call through the primary microphone.
  • Step 102 When the terminal enters the non-headphone call state, the audio channel is selected by the main microphone and the reference microphone by means of time division multiplexing; wherein the prior art is to collect the audio signals of the main microphone and the reference microphone at the same time, and the present invention applies
  • step 102 an audio channel is selected for the primary microphone and the reference microphone by means of time division multiplexing.
  • Step 103 collecting a call sound through the main microphone and collecting background noise through the reference microphone;
  • Step 104 Perform noise suppression processing on noise in the call sound by using background noise.
  • noise suppression is implemented inside the main control chip; however, the prior art generally processes noise inside the noise processing chip; in this step, after the terminal collects the call sound and the background noise, According to existing A processing algorithm for suppressing noise, using background noise to perform noise suppression processing on noise in the call sound.
  • the method for performing the noise suppression processing may specifically be: using a corresponding noise suppression processing algorithm according to the type of the microphone.
  • the operating environment of the method for using the dual microphone to suppress noise in this embodiment includes: a main control chip disposed in the communication terminal, and a main microphone, a headphone microphone, and a reference microphone disposed on the terminal.
  • the main control chip collects the call sound through the main microphone, and the call sound includes voice and noise.
  • the main control chip collects the voice of the earphone through the earphone microphone; the main control chip also collects the background noise through the reference microphone.
  • the solution of the embodiment is that the main control chip collects the call sound from the main microphone and the background noise of the reference microphone, and uses the background noise to perform noise suppression processing on the noise in the call sound of the main microphone, so as to achieve the purpose of clear call speech.
  • the terminal main control chip detects the current call state of the terminal, and determines whether the terminal enters the headset call state.
  • the terminal control chip controls the reference microphone and the main control chip, and
  • the main microphone and the reference microphone can be controlled by the main control chip to be connected to the shared audio channel inside the main control chip by means of time division multiplexing, and the main control chip collects the call sound through the main microphone and collects the background noise through the reference microphone.
  • the noise suppression processing is then performed on the noise in the call sound.
  • the terminal master chip detects that the terminal enters the headset call state, it is controlled by the terminal master chip, connects the earphone microphone with the master chip, and simultaneously disconnects the reference microphone from the master chip to ensure the earphone.
  • the normal conversation of the microphone is controlled by the terminal control chip of the terminal, and the audio channel is selected by the main microphone and the reference microphone by means of time division multiplexing, and the main microphone of the terminal itself collects the call of the main microphone.
  • Noise suppression processing is performed on the background noise of the sound and the reference microphone, which can effectively suppress the background noise of the call, reduce the wiring space of the motherboard, and save hardware costs.
  • Step 1020 Connect the reference microphone to the main control chip.
  • Step 1011 When the terminal enters the headset call state, the headset microphone is connected to the main control chip; Step 1012, selecting an audio channel for the headset microphone; Step 1013, collecting the call voice through the headset microphone.
  • the terminal main control chip detects the current call state of the terminal, and determines whether the terminal enters the headset call state.
  • the terminal control chip controls the reference microphone and the main control chip, and
  • the main microphone and the reference microphone are controlled by the main control chip to be connected to the shared audio channel inside the main control chip by means of time division multiplexing, and the main control chip collects the call sound of the main microphone and the background noise of the reference microphone, and then performs noise. Suppress processing.
  • This embodiment performs noise suppression processing, and the currently existing noise processing algorithm can be used. Depending on the type of microphone, there will be different noise suppression processing algorithms, so the corresponding noise suppression processing algorithm is used according to the type of the microphone.
  • the terminal main control chip detects that the terminal enters the headset call state
  • the terminal control chip controls the headset microphone to connect with the main control chip, and simultaneously disconnects the reference microphone from the main control chip to ensure the connection. The normal conversation of the headset microphone.
  • the terminal's own control chip detects the current call state of the terminal, and determines whether the terminal enters the headset call state.
  • the main control chip selects the headset microphone or the reference microphone to access the main control chip according to the current call state of the terminal.
  • the control chip collects the speech sound of the main microphone and the background noise of the reference microphone through time division multiplexing to perform noise suppression processing, which can effectively suppress the background noise of the call, reduce the wiring space of the motherboard, and save hardware costs.
  • FIG. 3 is a schematic structural view of an embodiment of a terminal for suppressing noise using dual microphones according to the present invention.
  • the present invention provides a terminal for suppressing noise by using a dual microphone, which includes a main control chip 301, a main microphone 302, a reference microphone 303, a headphone microphone 304, and a selection switch 305, wherein the main control chip 301 is provided.
  • the first microphone interface MIC1 and the second microphone interface MIC2 The main microphone 302 is connected to the main control chip 301 through the first microphone interface MIC1, and the output end of the selection switch 305 is connected to the main control chip 301 through the second microphone interface MIC2.
  • the selection switch 305 is provided with two input terminals, one input end and the earphone.
  • the microphone 304 is connected and its other input is connected to a reference microphone 303.
  • the main control chip 301 can be a baseband processor main control chip or other audio processing chip.
  • the main control chip 301 includes: a detecting module 3011, configured to: detect a current call state of the terminal, and determine whether the terminal enters a headset call state; and the switching module 3012 is configured to: when the terminal enters a non-headphone call state Selecting an audio path for the primary microphone 302 and the reference microphone 303 by way of time division multiplexing; and selecting an audio path for the headset microphone 304 when the terminal enters the headset call state; the collection module 3013 is configured to: when the terminal enters the non-earphone In the call state, the call sound is collected by the main microphone 302, and the background noise is collected by the reference microphone 303; and when the terminal enters the headset call state, the call sound is collected by the earphone microphone 304; the noise suppression processing module 3014 is set to : When the terminal enters the non-headphone call state, the background noise is used to perform noise suppression processing on the noise in the call sound.
  • the noise suppression processing module 3014 in this embodiment is a software package module in a main control chip, and the original audio signal enters the module and is processed by a software algorithm to output a noise-suppressed audio signal.
  • a special noise suppression chip is usually used. Therefore, the cost of the present invention is reduced as compared with the prior art.
  • the call voice collected by the collection module 3013 through the main microphone 302 is a non-headphone call voice, that is, a call voice collected when the headset is not in use.
  • the background noise collected by the collection module 3013 through the reference microphone 303 is background noise other than normal speech. For example, the sound in the background environment in which the network terminal is located, except for the speaker's voice.
  • the selection switch 305 is configured to: when the terminal enters the non-headphone conversation state, the reference microphone 303 is connected to the main control chip 301; and when the terminal enters the headset conversation state, the ear is The machine microphone 304 is connected to the main control chip 301.
  • the main microphone 302 is always connected to the main control chip 301 through the first microphone interface.
  • the terminal first detects the current call of the terminal through the detecting module 3011 in the main control chip 301. The state determines whether the terminal enters the headset call state.
  • the terminal enters the non-headphone call state, that is, when the terminal uses the main microphone 302 to make a call, the main control chip 301 controls the selection switch 305 to select, and the reference microphone 303 is connected to the main control chip.
  • the second mic interface of the 301, the switching module 3012 in the main control chip 301 selects the audio channel shared by the main control chip 301 by the main microphone 302 and the reference microphone 303 by means of time division multiplexing, that is, the main control chip 301 is scheduled.
  • the frequency of the primary microphone 302 and the reference microphone 303 switch to select an audio channel.
  • the collection module 3013 collects the call sound through the main microphone 302, and collects the background noise by referring to the microphone 303.
  • the noise suppression processing module 3014 performs noise suppression processing on the noise in the call sound by using the background noise. Noise suppression is applied to the existing noise processing algorithms.
  • the noise suppression processing module 3014 processes the noise, the normal call voice in the main control chip 301 is clear without background noise, which improves the call quality.
  • the terminal detecting module 3011 detects that the terminal enters the headset call state, for example, when the headset is inserted into the terminal, the master chip 301 controls the selection switch 305 to select, and the reference microphone 303 is disconnected from the second microphone of the master chip 301.
  • the switching module 3012 of the main control chip 301 disconnects the connection between the main microphone 302 and the audio path, and connects the earphone microphone 304 to the audio channel.
  • the module 3013 collects the call sound through the earphone microphone 304 to ensure a normal call of the earphone.
  • the terminal using the dual microphone to suppress noise according to the embodiment, the call sound and the reference microphone of the main microphone 302 are collected in a time division multiplexing manner by the terminal own control chip 301 and the selection switch 305 connected to the main control chip 301.
  • 303 background noise for noise suppression processing, simple structure Single can effectively reduce the background noise of the call, reduce the wiring space of the motherboard, and save hardware costs.
  • FIG. 5 is a schematic diagram showing the circuit connection of the terminal of the present invention using dual microphones to suppress noise.
  • the main control chip 301 is a baseband processor main control chip
  • the selection switch 305 is a double-pole double-throw analog switch. Specifically, the two pins of the output end of the selection switch 305 are respectively connected to the positive pole (Mic2p) and the negative pole (Mic2n) of the second microphone interface (MIC2) of the main control chip 301, and the two input ends of the selection switch 305 are respectively connected to the reference microphone.
  • a control line (the line shown by the control) and a power line (the Vcc in the figure) are connected between the main control chip 301 and the selection switch 305.
  • the baseband processor main control chip 301 controls the state of the selection switch 305, so that the reference microphone 303 is connected to the second microphone interface (MIC2), and
  • the switching control of the internal switching switch of the main control chip 301 selects the audio path of the main microphone 302 and the reference microphone 303 by means of time division multiplexing, so that the baseband processor collects the speech sound of the main microphone 302 and the background noise of the reference microphone 303.
  • the terminal circuit of the embodiment further includes a microphone matching circuit composed of components R1, R2, Cl, C2, and C3, and R3, C4, C5, and C6, which are not limited herein. description.
  • a microphone matching circuit composed of components R1, R2, Cl, C2, and C3, and R3, C4, C5, and C6, which are not limited herein. description.
  • R1, R2, Cl, C2, and C3, and R3, C4, C5, and C6, which are not limited herein. description.
  • the terminal circuit of the embodiment further includes a microphone matching circuit composed of components R1, R2, Cl, C2, and C3, and R3, C4, C5, and C6, which are not limited herein. description.
  • R1, R2, Cl, C2, and C3, and R3, C4, C5, and C6, which are not limited herein. description.
  • all or a portion of the steps above may be accomplished by a program to instruct the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk.
  • all or part of the steps of the above embodiments
  • the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or process changes made by the description of the invention and the drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.
  • INDUSTRIAL APPLICABILITY The present invention uses a dual microphone to suppress noise and a terminal through a terminal's own main control chip and a selection switch connected to the main control chip, and uses a time division multiplexing method to collect the call sound of the main microphone and the call noise of the reference microphone.
  • the device has a simple structure, can effectively suppress the background noise of the call, reduce the wiring space of the motherboard, and save hardware costs.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Telephone Function (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention porte sur un procédé de suppression de bruit à l'aide de deux microphones. Ledit procédé consiste à : vérifier l'état de communication courant d'un terminal, et déterminer si le terminal passe à un état de communication avec écouteur ou non ; lorsque le terminal passe à un état de communication sans écouteur, choisir des canaux audio pour un microphone principal et un microphone de référence en mode de multiplexage par répartition temporelle (TDM) ; collecter un signal vocal de communication par l'intermédiaire du microphone principal et collecter du bruit de fond par l'intermédiaire du microphone de référence ; et réaliser un traitement de suppression de bruit sur le bruit dans le signal vocal de communication à l'aide du bruit de fond. L'invention porte également sur un terminal pour suppression de bruit à l'aide de deux microphones. Dans l'invention, le signal vocal de communication du microphone principal et le bruit de communication du microphone de référence sont collectés en mode TDM afin de réaliser le traitement de suppression du bruit, et la structure de l'appareil est simple, ce qui réduit l'espace de routage dans la carte principale et réduit le coût en matériel, en supprimant efficacement en même temps le bruit de fond de communication.
PCT/CN2010/078093 2010-06-09 2010-10-25 Procédé et terminal pour suppression de bruit à l'aide de deux microphones Ceased WO2011153779A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010196193.4 2010-06-09
CN201010196193A CN101873363A (zh) 2010-06-09 2010-06-09 使用双麦克抑制噪声的方法及终端

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Publication Number Publication Date
WO2011153779A1 true WO2011153779A1 (fr) 2011-12-15

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CN (1) CN101873363A (fr)
WO (1) WO2011153779A1 (fr)

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CN102368793B (zh) * 2011-10-12 2014-03-19 惠州Tcl移动通信有限公司 手机及其通话信号处理方法
CN104394490A (zh) * 2014-10-30 2015-03-04 中名(东莞)电子有限公司 具有降噪效果的入耳式耳机
CN105100470A (zh) * 2015-07-22 2015-11-25 惠州Tcl移动通信有限公司 一种移动终端麦克风功能切换的方法及系统
CN107507622A (zh) * 2017-08-07 2017-12-22 维沃移动通信有限公司 声音信号的处理方法、移动终端及计算机可读存储介质
CN109087658A (zh) * 2018-07-16 2018-12-25 安徽国通亿创科技股份有限公司 一种在线互动直播噪声处理系统
CN114171040A (zh) * 2021-10-27 2022-03-11 歌尔科技有限公司 一种音频降噪方法及音频监控装置
CN114007157B (zh) * 2021-10-28 2025-04-01 中北大学 一种智能降噪通信耳机
CN113992223B (zh) * 2021-10-29 2022-11-25 江西扬声电子有限公司 一种基于麦克风阵列降噪的机内通话系统
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