WO2019024393A1 - 耳机上行降噪方法 - Google Patents
耳机上行降噪方法 Download PDFInfo
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- WO2019024393A1 WO2019024393A1 PCT/CN2017/117477 CN2017117477W WO2019024393A1 WO 2019024393 A1 WO2019024393 A1 WO 2019024393A1 CN 2017117477 W CN2017117477 W CN 2017117477W WO 2019024393 A1 WO2019024393 A1 WO 2019024393A1
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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
- H04R1/1083—Reduction of ambient noise
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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
- H04R2410/01—Noise reduction using microphones having different directional characteristics
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- the present invention relates to the field of acoustic technology, and more particularly to a method for uplink noise reduction of a headphone.
- the headset is gradually converted to a digital mode, and an earphone with an ANC (Active Noise Control) function can be implemented on the digital earphone.
- ANC Active Noise Control
- the noise reduction function mainly has two implementation modes, one is to realize the uplink noise reduction function through the call microphone; the other is realized by multiplexing the microphones respectively arranged in the earphones of the left and right sides.
- Upstream noise reduction Although multiplexing the microphones respectively disposed in the earphones of the left and right earphones for uplink noise reduction can better eliminate the noise of the left and right sides of the user, but the audio signals received by the microphones disposed in the earphones of the left and right sides are received.
- the noise on the back side of the user can not be basically eliminated; and since the call microphone is usually set on the wire control box of the earphone, its position cannot be effectively fixed, and the uplink noise reduction function of a single microphone is not ideal. .
- an earphone and a noise reduction method thereof are disclosed, specifically, a noise reduction microphone is respectively disposed in two earpieces of the earphone, and a call microphone is fixedly arranged on the earphone line, The call microphone and the two noise reduction microphones cooperate to achieve the uplink noise reduction function of the earphone.
- a noise reduction microphone is respectively disposed in two earpieces of the earphone, and a call microphone is fixedly arranged on the earphone line, The call microphone and the two noise reduction microphones cooperate to achieve the uplink noise reduction function of the earphone.
- it is merely a superposition of the noise reduction function of the noise canceling microphone and the talk microphone, which also fluctuates the performance of the headphone up noise reduction due to the unfixed position of the talk microphone.
- an object of the present invention is to provide an uplink noise reduction method for a headset to solve the problem that the uplink noise reduction performance of the existing uplink noise reduction method is unstable.
- the earphone uplink noise reduction method provided by the present invention, wherein the earphone comprises a noise reduction microphone respectively disposed in the earphones on the left and right sides of the earphone, and a call microphone disposed on the earphone line; the uplink noise reduction method of the earphone comprises: multiplexing the earphone left The noise reduction microphone in the side or the right earpiece is used as the first uplink noise reduction microphone, and the call microphone is used as the second uplink noise reduction microphone; the voice signal picked up by the second uplink noise reduction microphone is acquired, and the voice signal is compared with a preset threshold.
- the first uplink noise reduction microphone and the second uplink noise reduction microphone are used to pick up the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the voice signal is used for noise cancellation; otherwise, the second uplink noise reduction microphone is used to perform noise cancellation on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone; wherein the preset threshold is preset The energy value or sensitivity value of the voice signal picked up by the second uplink noise reduction microphone.
- the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone are analyzed, and the first uplink is dropped according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the noise signal picked up by the noise microphone and the second uplink noise reduction microphone performs noise cancellation.
- the preferred manner is: the voice picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the first uplink noise reduction microphone and the second noise reduction microphone are picked up by comparing the voice signal picked up by the first uplink noise reduction microphone with the voice signal picked up by the second uplink noise reduction microphone.
- the voice signals of the same size in the received speech signal are eliminated, and the voice signals of different sizes are reserved.
- the preferred manner is: the voice picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the first uplink noise reduction microphone and the second noise reduction microphone are picked up by comparing the voice signal picked up by the first uplink noise reduction microphone with the voice signal picked up by the second uplink noise reduction microphone.
- the speech signals of the same frequency in the received speech signal are eliminated, and the speech signals having different frequencies are reserved.
- a preferred manner is: the difference between the first uplink noise reduction microphone and the second uplink noise reduction microphone according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone During the noise cancellation process, the voice signal picked up by the first uplink noise reduction microphone and the voice signal picked up by the second uplink noise reduction microphone are compared, and the first uplink is lowered. The voice signal of the same size and frequency in the voice signal picked up by the noise microphone and the second noise-reduction microphone is eliminated, and the voice signals with the same frequency, the same frequency, the same frequency, and different frequency and different frequency are reserved.
- the preferred method is: in the process of performing noise cancellation on the voice signal picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone by using the second uplink noise reduction microphone, the second uplink noise reduction microphone pair
- the picked speech signal is analyzed to determine the direction of the speech signal and eliminate the beam located behind the head, leaving the beam in front of the head to eliminate noise in the speech signal.
- the second uplink noise reduction microphone passes the voice.
- the noise signal in the signal is different from the frequency band of the speech signal, eliminating noise in the speech signal.
- the preferred manner is: using the first uplink noise reduction microphone and the second uplink noise reduction microphone, or the second uplink noise reduction microphone to pick up the voice signals of the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- noise cancellation is performed on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone through a filter.
- the noise reduction microphone in the left or right earpiece of the earphone is used as the first uplink noise reduction microphone, and the call microphone is used as the second uplink noise reduction microphone, and then the second The voice signal picked up by the uplink noise reduction microphone is compared with a preset threshold, which is a preset value of the energy value or sensitivity value of the voice signal picked up by the second uplink noise reduction microphone; when the second uplink noise reduction microphone When the picked-up voice signal is less than the preset threshold, the first uplink noise reduction microphone and the second uplink noise reduction microphone are used to perform noise cancellation on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone; otherwise, The second uplink noise reduction microphone is used to perform noise cancellation on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the invention can avoid the problem that the performance of the uplink noise reduction of the earphone fluctuates due to the position of the
- FIG. 1 is a schematic flow chart of a method for uplink noise reduction of a headset according to an embodiment of the invention.
- the above-mentioned existing headphone uplink noise reduction method has the problem that the uplink noise reduction performance is unstable.
- the present invention uses the noise reduction microphone in the left or right earpiece of the earphone as the first uplink noise reduction microphone, and the call microphone is used as the first The second uplink noise reduction microphone, and then comparing the voice signal picked up by the second uplink noise reduction microphone with a preset threshold, where the preset threshold is a preset value of the energy value of the voice signal picked up by the second uplink noise reduction microphone or Sensitivity value; when the voice signal picked up by the second uplink noise reduction microphone is less than a preset threshold, the first uplink noise reduction microphone and the second uplink noise reduction microphone are used for the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the picked-up voice signal performs noise cancellation; otherwise, the second uplink noise reduction microphone is used to perform noise cancellation on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the invention can avoid the problem that the performance of the headphone uplink noise reduction fluctuates due to the position of the call microphone is not fixed, thereby improving the voice quality of the call.
- the earphone in the present invention includes a noise reduction microphone respectively disposed in the earpieces on the left and right sides of the earphone, and a call microphone disposed on the earphone line.
- the call microphone (the second uplink noise reduction microphone described below) may be fixed on the left ear line or the right ear line.
- the dual-microphone or single-microphone wind is used to implement the uplink noise reduction function of the earphone according to different voice environments.
- the noise reduction microphone in the earpiece on one side of the left and right sides of the multiplexed earphone is used as one of the uplink noise reduction microphones
- the call microphone is used as another one of the uplink noise reduction microphones.
- FIG. 1 shows a flow of a method for uplink noise reduction of a headset according to an embodiment of the present invention.
- S120 Acquire a voice signal picked up by the second uplink noise reduction microphone, and compare the voice signal with a preset threshold.
- the preset threshold is a preset voice energy of the voice signal picked up by the second uplink noise reduction microphone. Value or sensitivity value; if the voice signal is less than the preset threshold, proceed to step S130, otherwise proceed to step S140.
- S130 Perform noise cancellation on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone by using the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- S140 Perform noise cancellation on the voice signal picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone by using the second uplink noise reduction microphone.
- the user usually has two modes when wearing the earphone, one is the normal wearing mode, that is, the left ear earpiece and the right ear earpiece are normally worn in the ear, and the earphone wire is in a normal drooping state.
- the call microphone is away from the microphone.
- the distance between the mouth is far, the voice signal of the user picked up by the call microphone is relatively weak; the other is the wearing mode of the call microphone close to the mouth (the near mouth mode described below), that is, the distance from the microphone to the mouth of the call is relatively small.
- the left ear earpiece or the right ear earpiece can be worn normally, and can also hang naturally. In this state, the voice signal of the user picked up by the call microphone is relatively strong. Therefore, in the present invention, different uplink noise reduction methods are used according to different voice environments to effectively guarantee the voice quality of the call.
- the wearing mode of the earphone is determined by recognizing the voice signal picked up by the call microphone (the second uplink noise canceling microphone described below), thereby further determining the noise reduction scheme according to the wearing mode.
- a distance of 2 cm from the mouth is set as a critical value, and when the distance is less than 2 cm, it is determined as a near-mouth mode, and when the distance is greater than 2 cm, it is a normal wearing mode.
- the energy or sensitivity of the voice signal picked up by the call microphone can be tested at a distance of 2 cm, and the preset threshold value is determined according to the energy value or sensitivity value of the picked up voice signal.
- the preset threshold may be determined according to the test environment of the laboratory, or may be determined according to a voice signal actually generated by the user during the use of the earphone, or may be periodically corrected according to the user's recent historical voice signal.
- the voice signal of the user picked up by the call microphone is smaller than the preset threshold.
- the dual microphone is used for uplink noise reduction, which is implemented based on the difference of the voice signals picked up by the two microphones (the first uplink noise reduction microphone and the second uplink noise reduction microphone).
- the first uplink noise reduction is performed.
- the voice signal picked up by the microphone and the second uplink noise reduction microphone is analyzed, and according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone, the first uplink noise reduction microphone and the second The voice signal picked up by the upstream noise reduction microphone performs noise cancellation.
- the first uplink noise reduction microphone and the second uplink noise reduction microphone are picked up.
- the magnitude of the noise signal is based on uniformity, so the difference in magnitude between the two signals picked up by the two microphones can be utilized to eliminate noise in the speech signal.
- noise cancellation is performed on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the voice signals picked up by the first uplink noise reduction microphone and the second noise reduction microphone are compared.
- the same size of the voice signal is eliminated, and the voice signals of different sizes are reserved.
- the speech signals of different sizes can also be subjected to speech enhancement, thereby further eliminating noise in the speech signals.
- the frequency of the voice signal picked up by the second uplink noise reduction microphone is greater than the frequency of the voice signal picked up by the first uplink noise reduction microphone, and for the surrounding noise, the first uplink is lowered.
- the frequency of the noise signal picked up by the noise microphone and the second up-rower noise canceling microphone is based on the coincidence, and therefore, the frequency difference between the two signals picked up by the two microphones can be utilized, thereby eliminating the noise in the voice signal.
- noise cancellation is performed on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone.
- the voice signals picked up by the first uplink noise reduction microphone and the second noise reduction microphone are compared.
- the same frequency of the speech signal is eliminated, and the speech signals of different frequencies are reserved.
- the speech signals having different frequencies can be subjected to speech enhancement, thereby further eliminating noise in the speech signals.
- the above two methods may be combined. Specifically, the voice picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone according to the difference of the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone During the noise cancellation process, comparing the voice signal picked up by the first uplink noise reduction microphone with the voice signal picked up by the second uplink noise reduction microphone, the first uplink noise reduction microphone and the The speech signal of the same size and frequency in the speech signal picked up by the second noise-reduction microphone is eliminated, and the speech signals with the same frequency and different frequency, the same frequency and the same frequency and different frequency are reserved.
- the voice signal picked up by the second uplink noise canceling microphone is significantly increased, and the voice signal of the user picked up by the calling microphone is relatively greater than or equal to a preset threshold.
- a single microphone that is, only the second uplink noise reduction microphone is used) performs uplink noise reduction to avoid problems such as voice breakage distortion when the second uplink noise reduction microphone approaches the mouth.
- the second uplink noise reduction microphone pairs the picked up voice
- the signal is analyzed to determine the direction of the speech signal and to eliminate the beam located behind the head, leaving the beam in front of the head to eliminate noise in the speech signal.
- the second uplink noise reduction microphone passes the noise signal in the voice signal.
- the difference in frequency band from the speech signal eliminates noise in the speech signal.
- the process of performing noise cancellation on the voice signals picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone by using the first uplink noise reduction microphone and the second uplink noise reduction microphone or the second uplink noise reduction microphone The noise signal picked up by the first uplink noise reduction microphone and the second uplink noise reduction microphone is cancelled by a filter.
- the first noise reduction microphone may be an ANC microphone
- the second noise reduction microphone may be an ANC microphone, a condenser microphone, or an electric microphone
- the present invention can implement the uplink noise reduction function of the earphone according to different voice environments and adopt different uplink noise reduction schemes, thereby avoiding the problem that the uplink noise reduction performance is unstable due to the position uncertainty of the call microphone. Moreover, it is possible to avoid the problem of distortion of the voice broken when the microphone is near the mouth, thereby greatly improving the voice quality of the call.
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Abstract
本发明提供了一种耳机上行降噪方法，包括：复用耳机左侧或者右侧听筒内的降噪麦克风作为第一上行降噪麦克风，将通话麦克风作为第二上行降噪麦克风；获取第二上行降噪麦克风所拾取的语音信号，将语音信号与预设阈值进行比较，预设阈值为预先设定的第二上行降噪麦克风所拾取的语音信号的能量值或者灵敏度值；如果语音信号小于预设阈值，采用第一上行降噪麦克风和第二上行降噪麦克风对语音信号进行噪音消除；否则，采用第二上行降噪麦克风对语音信号进行噪音消除。通过本发明能够避免因通话麦克风的位置不固定而使耳机上行降噪的性能出现波动的问题，从而提高通话的语音质量。
Description
本发明涉及声学技术领域，更为具体地，涉及一种耳机上行降噪方法。
随着高品质智能手机、Pad等便携式电子产品的广泛应用，人们对可与其配合应用的耳机的声学参数的要求也越来越高。随着TypeC和Lightning接口的引入，耳机逐渐向数字模式转换，具备ANC(Active Noise Control，主动噪声控制系统)功能的耳机得以在数字耳机上实现。
在目前的ANC耳机中，其降噪功能主要有两种实现方式，一种是通过通话麦克风来实现上行降噪功能；另一种是通过复用分别设置在左右两侧耳机听筒内的麦克风实现上行降噪。虽然复用分别设置在左右两侧耳机听筒内的麦克风进行上行降噪的方式能够对使用者左右的噪音消除效果较好，但由于设置在左右两侧耳机听筒内的麦克风所接收到的音频信号相对稳定，因此，其对于使用者后侧的噪音则基本无法消除；而由于通话麦克风通常设置在耳机的线控盒上，其位置无法有效进行固定，且单个麦克风的上行降噪功能并不理想。
在申请号为201610147513.4的中国发明专利中，其公布了一种耳机及其降噪方法，具体为在耳机两个听筒内分别设置有一颗降噪麦克风，在耳机线上固定设置有一通话麦克风，通过通话麦克风与两颗降噪麦克风的配合来实现对耳机的上行降噪功能。然而，其仅仅只是降噪麦克风和通话麦克风的降噪功能的叠加，其同样会由于通话麦克风的位置的不固定而使耳机上行降噪的性能出现波动。
发明内容
鉴于上述问题，本发明的目的是提供一种耳机上行降噪方法，以解决现有的上行降噪方法存在的上行降噪性能不稳定的问题。
本发明提供的耳机上行降噪方法，其中，耳机包括分别设置在耳机左右两侧听筒内的降噪麦克风，以及设置在耳机线上的通话麦克风；该耳机上行降噪方法包括：复用耳机左侧或者右侧听筒内的降噪麦克风作为第一上行降噪麦克风，将通话麦克风作为第二上行降噪麦克风；获取第二上行降噪麦克风所拾取的语音信号，将语音信号与预设阈值进行比较；如果第二上行降噪麦克风所拾取的语音信号小于预设阈值，采用第一上行降噪麦克风和第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除；否则，采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除；其中，预设阈值为预先设定的第二上行降噪麦克风所拾取的语音信号的能量值或者灵敏度值。
此外，优选的方式为：在采用第一上行降噪麦克风和第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行分析，根据第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
此外，优选的方式为：在根据第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比第一上行降噪麦克风所拾取到的语音信号与第二上行降噪麦克风所拾取到的语音信号，将第一上行降噪麦克风和第二降噪麦克风所拾取到的语音信号中的大小相同的语音信号进行消除，保留大小不相同的语音信号。
此外，优选的方式为：在根据第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比第一上行降噪麦克风所拾取到的语音信号与第二上行降噪麦克风所拾取到的语音信号，将第一上行降噪麦克风和第二降噪麦克风所拾取到的语音信号中的频率相同的语音信号进行消除，保留频率不相同的语音信号。
此外，优选的方式为：在根据所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比所述第一上行降噪麦克风所拾取到的语音信号与所述第二上行降噪麦克风所拾取到的语音信号，将所述第一上行降噪麦克风和所述第二降噪麦克风所拾取到的语音信号中的大小和频率均相同的语音信号进行消除，保留频率相同大小不同、频率不同大小相同以及频率不同大小不同的语音信号。
此外，优选的方式为：在采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，第二上行降噪麦克风对所拾取到的语音信号进行分析，判断语音信号的方向，并消除位于头部后方的波束，保留位于头部前方的波束，以消除语音信号中的噪音。
此外，优选的方式为：在采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，第二上行降噪麦克风通过语音信号中的噪音信号与语音信号的频段差异，消除语音信号中的噪音。
此外，优选的方式为：在采用第一上行降噪麦克风和第二上行降噪麦克风、或第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，通过滤波器对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
利用上述根据本发明的耳机上行降噪方法，通过复用耳机左侧或者右侧听筒内的降噪麦克风作为第一上行降噪麦克风，将通话麦克风作为第二上行降噪麦克风，然后将第二上行降噪麦克风所拾取的语音信号与预设阈值进行比较，该预设阈值为预先设定的第二上行降噪麦克风所拾取的语音信号的能量值或者灵敏度值；当第二上行降噪麦克风所拾取的语音信号小于预设阈值时，采用第一上行降噪麦克风和第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取的语音信号进行噪音消除；否则，采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。通过本发明能够避免因通话麦克风的位置不固定而使耳 机上行降噪的性能出现波动的问题，从而提高通话的语音质量。
为了实现上述以及相关目的，本发明的一个或多个方面包括后面将详细说明特别指出的特征。下面的说明以及附图详细说明了本发明的某些示例性方面。然而，这些方面指示的仅仅是可使用本发明的原理的各种方式中的一些方式。此外，本发明旨在包括所有这些方面以及它们的等同物。
通过参考以下结合附图的说明内容，并且随着对本发明的更全面理解，本发明的其它目的及结果将更加明白及易于理解。在附图中：
图1为根据本发明实施例的耳机上行降噪方法的流程示意图。
在所有附图中相同的标号指示相似或相应的特征或功能。
以下将结合附图对本发明的具体实施例进行详细描述。
针对前述现有的耳机上行降噪方法存在上行降噪性能不稳定的问题，本发明通过复用耳机左侧或者右侧听筒内的降噪麦克风作为第一上行降噪麦克风，将通话麦克风作为第二上行降噪麦克风，然后将第二上行降噪麦克风所拾取的语音信号与预设阈值进行比较，该预设阈值为预先设定的第二上行降噪麦克风所拾取的语音信号的能量值或者灵敏度值；当第二上行降噪麦克风所拾取的语音信号小于预设阈值时，采用第一上行降噪麦克风和第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取的语音信号进行噪音消除；否则，采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。通过本发明能够避免因通话麦克风的位置不固定而使耳机上行降噪的性能出现波动的问题，从而提高通话的语音质量。
需要说明的是，本发明中的耳机包括分别设置在耳机左右两侧听筒内的降噪麦克风，以及设置在耳机线上的通话麦克风。其中，通话麦克风(下述的第二上行降噪麦克风)可以固定在左耳分线或者右耳分线上。在本发明提供的耳机上行降噪方法中，是根据不同的语音环境，采用双麦克风或者单麦 克风来实现耳机的上行降噪功能。在采用双麦克风进行上行降噪时，是复用的耳机左右两侧其中一侧的听筒内的降噪麦克风作为上行降噪麦克风的其中一颗，将通话麦克风作为上行降噪麦克风的另一颗。
具体地，为说明本发明提供的耳机上行降噪方法，图1示出了根据本发明实施例的耳机上行降噪方法的流程。
S110：复用耳机左侧或者右侧听筒内的降噪麦克风作为第一上行降噪麦克风，将通话麦克风作为第二上行降噪麦克风。
S120：获取第二上行降噪麦克风所拾取的语音信号，将该语音信号与预设阈值进行比较；其中，该预设阈值为预先设定的第二上行降噪麦克风所拾取的语音信号的能量值或者灵敏度值；如果该语音信号小于预设阈值时，进入步骤S130，否则进入步骤S140。
S130：采用第一上行降噪麦克风和第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
S140：采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
由于使用者在佩戴耳机时通常会有两种模式，一种是正常佩戴模式，即：左耳听筒和右耳听筒均正常佩戴在耳朵内，耳机线处于正常下垂状态，此时，通话麦克风离嘴的距离较远，通话麦克风所拾取到的使用者的语音信号相对较弱；另一种是通话麦克风靠近嘴的佩戴模式(下述的近嘴模式)，即：通话麦克风到嘴的距离较近，左耳听筒或者右耳听筒可正常佩戴，亦可自然下垂，此种状态下通话麦克风所拾取到的使用者的语音信号相对较强。因此，在本发明中，根据不同的语音环境采用不同的上行降噪方法能够有效保证通话的语音质量。
在本发明耳机上行降噪方法中，通过对通话麦克风(下述的第二上行降噪麦克风)所拾取到的语音信号的识别，确定耳机的佩戴模式，从而进一步根据佩戴模式确定降噪方案。在本发明的一个具体实施方式中，设定距离嘴巴为2cm的距离为临界值，当距离小于2cm时确定为近嘴模式，距离大于2cm时为正常佩戴模式。根据耳机实际使用的通话麦克风的类型，可在2cm距离时，测试通话麦克风所拾取到的语音信号的能量或者灵敏度，根据所拾取到的语音信号的能量值或者灵敏度值确定预设阈值。当然，上述的预设阈值可 以根据实验室的测试环境而定，也可以根据使用者在使用耳机的过程中实际产生的语音信号确定，亦可以定期根据使用者的近期历史语音信号进行修正。
具体地，当通话麦克风(即上述的第二上行降噪麦克风)离嘴的距离较远，即正常佩戴模式时，通话麦克风所拾取到的使用者的语音信号相对于预设阈值较小，可采用双麦克风进行上行降噪，其是基于两个麦克风(第一上行降噪麦克风和第二上行降噪麦克风)所拾取到的语音信号的差异来实现的。
即：在采用第一上行降噪麦克风和第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行分析，根据第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
具体地，在正常佩戴模式下，由于第一上行降噪麦克风距离嘴巴的距离较远，而相对于第一上行降噪麦克风，第二上行降噪麦克风距离嘴巴的距离较近，当嘴巴发声时，第二上行降噪麦克风拾取到的语音信号会大于第一上行降噪麦克风拾取到的语音信号，而对于周围噪声来说，第一上行降噪麦克风和第二上行降噪麦克风所拾取到的噪音信号的大小基于一致，因此，可以利用两种信号被两个麦克风所拾取到的大小差异，从而将语音信号中的噪音消除。
即：在根据第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比第一上行降噪麦克风所拾取到的语音信号与第二上行降噪麦克风所拾取到的语音信号，将第一上行降噪麦克风和第二降噪麦克风所拾取到的语音信号中的大小相同的语音信号进行消除，保留大小不相同的语音信号。此外，在将大小不相同的语音信号保留之后，还可以对大小不相同的语音信号进行语音增强，从而进一步将语音信号中的噪音进行消除。
同样地，在正常佩戴模式下，第二上行降噪麦克风所拾取到的语音信号的频率会大于第一上行降噪麦克风拾取到的语音信号的频率，而对于周围噪声来说，第一上行降噪麦克风和第二上行降噪麦克风所拾取到的噪音信号的 频率基于一致，因此，可以利用两种信号被两个麦克风所拾取到的频率差异，从而将语音信号中的噪音消除。
即：在根据第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比第一上行降噪麦克风所拾取到的语音信号与第二上行降噪麦克风所拾取到的语音信号，将第一上行降噪麦克风和第二降噪麦克风所拾取到的语音信号中的频率相同的语音信号进行消除，保留频率不相同的语音信号。此外，在将频率不相同的语音信号保留之后，还可以对频率不相同的语音信号进行语音增强，从而进一步将语音信号中的噪音进行消除。
或者，也可以将上述两种方式结合。具体地，在根据所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比所述第一上行降噪麦克风所拾取到的语音信号与所述第二上行降噪麦克风所拾取到的语音信号，将所述第一上行降噪麦克风和所述第二降噪麦克风所拾取到的语音信号中的大小和频率均相同的语音信号进行消除，保留频率相同大小不同、频率不同大小相同以及频率不同大小不同的语音信号。
在通话麦克风靠近嘴的佩戴模式下，第二上行降噪麦克风所拾取到的语音信号会明显增大，通话麦克风所拾取到的使用者的语音信号相对大于等于预设阈值，此时，可采用单麦克风(即仅只采用第二上行降噪麦克风)进行上行降噪，以避免第二上行降噪麦克风靠近嘴时出现语音破音失真等问题的出现。
具体地，在采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，第二上行降噪麦克风对所拾取到的语音信号进行分析，判断语音信号的方向，并消除位于头部后方的波束，保留位于头部前方的波束，以消除语音信号中的噪音。
此外，在采用第二上行降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，第二上行降噪麦克风通过语音信号中的噪音信号与语音信号的频段差异，消除语音信号中的噪音。
另外，在采用第一上行降噪麦克风和第二上行降噪麦克风、或第二上行 降噪麦克风对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，通过滤波器对第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
在本发明的一个具体实施方式中，上述的第一降噪麦克风可以采用ANC麦克风，第二降噪麦克风可以采用ANC麦克风、电容式麦克风或者电动式麦克风等。
通过上述可知，本发明能够根据不同的语音环境，采用不同的上行降噪方案来实现耳机的上行降噪功能，从而既可以避免因通话麦克风的位置不确定而导致上行降噪性能不稳定的问题，又能够避免因通话麦克风近嘴时出现的语音破音失真的问题，从而极大提高通话的语音质量。
如上参照附图以示例的方式描述根据本发明的耳机上行降噪方法。但是，本领域技术人员应当理解，对于上述本发明所提出的耳机上行降噪方法，还可以在不脱离本发明内容的基础上做出各种改进。因此，本发明的保护范围应当由所附的权利要求书的内容确定。
Claims (10)
- 一种耳机上行降噪方法，其特征在于，所述耳机包括分别设置在耳机左右两侧听筒内的降噪麦克风，以及设置在耳机线上的通话麦克风；所述耳机上行降噪方法包括：复用耳机左侧或者右侧听筒内的降噪麦克风作为第一上行降噪麦克风，将所述通话麦克风作为第二上行降噪麦克风；获取所述第二上行降噪麦克风所拾取的语音信号，将所述语音信号与预设阈值进行比较；如果所述第二上行降噪麦克风所拾取的语音信号小于所述预设阈值，采用第一上行降噪麦克风和第二上行降噪麦克风对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除；否则，采用所述第二上行降噪麦克风对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除；其中，所述预设阈值为预先设定的所述第二上行降噪麦克风所拾取的语音信号的能量值或者灵敏度值。
- 如权利要求1所述的耳机上行降噪方法，其中，在采用第一上行降噪麦克风和第二上行降噪麦克风对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行分析，根据所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
- 如权利要求2所述的耳机上行降噪方法，其中，在根据所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比所述第一上行降噪麦克风所拾取到的语音信号与所述第二上行降噪 麦克风所拾取到的语音信号，将所述第一上行降噪麦克风和所述第二降噪麦克风所拾取到的语音信号中的大小相同的语音信号进行消除，保留大小不相同的语音信号。
- 如权利要求2所述的耳机上行降噪方法，其中，在根据所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比所述第一上行降噪麦克风所拾取到的语音信号与所述第二上行降噪麦克风所拾取到的语音信号，将所述第一上行降噪麦克风和所述第二降噪麦克风所拾取到的语音信号中的频率相同的语音信号进行消除，保留频率不相同的语音信号。
- 如权利要求2所述的耳机上行降噪方法，其中，在根据所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号的差异，对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，对比所述第一上行降噪麦克风所拾取到的语音信号与所述第二上行降噪麦克风所拾取到的语音信号，将所述第一上行降噪麦克风和所述第二降噪麦克风所拾取到的语音信号中的大小和频率均相同的语音信号进行消除，保留频率相同大小不同、频率不同大小相同以及频率不同大小不同的语音信号。
- 如权利要求1所述的耳机上行降噪方法，其中，在采用所述第二上行降噪麦克风对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，所述第二上行降噪麦克风对所拾取到的语音信号进行分析，判断所述语音信号的方向，并消除位于头部后方的波束，保留位于头部前方的波束，以消除所述语音信号中的噪音。
- 如权利要求1所述的耳机上行降噪方法，其中，在采用所述第二上行 降噪麦克风对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，所述第二上行降噪麦克风通过所述语音信号中的噪音信号与所述语音信号的频段差异，消除所述语音信号中的噪音。
- 如权利要求1所述的耳机上行降噪方法，其中，在采用第一上行降噪麦克风和第二上行降噪麦克风、或所述第二上行降噪麦克风对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除的过程中，通过滤波器对所述第一上行降噪麦克风和第二上行降噪麦克风所拾取到的语音信号进行噪音消除。
- 如权利要求1所述的耳机上行降噪方法，其中，所述第一降噪麦克风采用主动噪声控制系统麦克风；所述第二降噪麦克风采用主动噪声控制系统麦克风、电容式麦克风或者电动式麦克风。
- 如权利要求1所述的耳机上行降噪方法，其中，所述第二上行降噪麦克风固定在左耳分线或者右耳分线上。
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