CN105723447A - 通过对内部白噪声进行自适应整形以训练辅助路径的自适应消噪系统及方法 - Google Patents

通过对内部白噪声进行自适应整形以训练辅助路径的自适应消噪系统及方法 Download PDF

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CN105723447A
CN105723447A CN201480058153.XA CN201480058153A CN105723447A CN 105723447 A CN105723447 A CN 105723447A CN 201480058153 A CN201480058153 A CN 201480058153A CN 105723447 A CN105723447 A CN 105723447A
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阿里·阿卜杜拉扎德·米拉尼
路阳
周大勇
李宁
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Cirrus Logic Inc
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    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
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    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
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Abstract

一种处理电路可包括：(i)自适应滤波器，具有响应，从参考麦克风信号生成抗噪信号，其中所述响应被整形成与所述参考麦克风信号和回放校正误差一致；(ii)辅助路径估计滤波器，被构成为对源音频信号的电声路径进行建模，且具有响应，从所述源音频信号生成辅助路径估计；(iii)辅助系数控制方块，通过调适所述辅助路径估计滤波器的响应以使回放校正误差最小化，将所述辅助路径估计滤波器的响应整形成与所述源音频信号和所述回放校正误差一致；和(iv)噪声注入部，用于将噪声信号注入至所述源音频信号中，其中所述噪声信号基于所述回放校正误差被整形。

Description

通过对内部白噪声进行自适应整形以训练辅助路径的自适应消噪系统及方法
技术领域
本发明大体上涉及与声换能器有关的自适应消噪，更特定地，涉及存在于声换能器附近的周围噪声的检测与消除，包括对通过自适应消噪生成的抗噪的抗噪电平进行偏置。
背景技术
无线电话(诸如移动电话/蜂窝式电话、无绳电话)及其他消费音频设备(诸如mp3播放器)被广泛应用。使用麦克风来测量周围声事件，然后使用信号处理将抗噪信号注入至设备输出中以消除周围声事件，通过提供消噪，此类设备的性能就清晰度而论可得到改良。因为根据所存在的噪声源及设备自身的位置，在个人音频设备(诸如无线电话)周围的声环境可发生很大变化，所以期望调适消噪以考虑此类环境变化。
典型自适应消噪(ANC)系统可包括：参考麦克风，用于提供表示靠近个人音频设备的周围音频声音的参考麦克风信号；和误差麦克风，靠近换能器，用于提供表示换能器的声输出及换能器处周围音频声音的误差麦克风信号。典型ANC系统还可包括自适应前馈滤波器，通过基于回放校正误差调适对参考麦克风的输出进行滤波的自适应滤波器的响应以使在误差麦克风信号中的周围音频声音最小化，所述自适应前馈滤波器从参考麦克风信号生成抗噪信号，以应对在换能器的声输出处的周围音频声音的影响，其中回放校正误差基于误差麦克风信号与辅助路径估计之差。此外，典型ANC系统可包括自适应辅助路径估计滤波器，用于对源音频信号的电声路径进行建模，通过调适辅助路径估计自适应滤波器的响应以使回放校正误差最小化，所述自适应辅助路径估计滤波器从源音频信号生成辅助路径估计，其中回放校正误差基于误差麦克风信号与辅助路径估计之差。典型ANC系统可将抗噪信号与源音频信号进行组合以生成提供给换能器的音频信号。
这样的ANC系统需要源音频信号，以便正确地调适或“训练”辅助路径估计滤波器的响应。然而，利用源音频信号进行训练的缺点可能在于这样的信号可能不具有有效地训练辅助路径估计滤波器的响应所需的暂留时间或频谱密度，原因在于源音频信号可能具有静默时间间隔或可能缺乏在特定频率范围内的含量。这样的缺点可能尤其存在立体声回放模式下，因为立体声信号的各声道可能只传送源音频信号的一部分。
发明内容
根据本发明的教示，与自适应消噪的现有方法相关联的缺点和问题可减少或消除。
根据本发明的实施例，一种个人音频设备可包括个人音频设备壳体、换能器、参考麦克风、误差麦克风和处理电路。换能器可耦接至壳体，用于再现音频信号，所述音频信号既包括回放给收听者的源音频信号又包括抗噪信号，所述抗噪信号用于应对在换能器的声输出中的周围音频声音的影响。参考麦克风可耦接至壳体，用于提供表示周围音频声音的参考麦克风信号。误差麦克风可耦接至壳体，靠近换能器，用于提供表示换能器的声输出及换能器处周围音频声音的误差麦克风信号。处理电路可包括自适应滤波器，具有响应，从参考麦克风信号生成抗噪信号，其中所述响应被整形成与参考麦克风信号和回放校正误差一致，以及其中回放校正误差基于误差麦克风信号与辅助路径估计之差。处理电路还可包括：辅助路径估计滤波器，被构成为对源音频信号的电声路径进行建模且具有响应，从源音频信号生成辅助路径估计；辅助系数控制方块，通过调适辅助路径估计滤波器的响应以使回放校正误差最小化，所述辅助系数控制方块将辅助路径估计滤波器的响应整形成与源音频信号和回放校正误差一致；和噪声注入部，用于将噪声信号注入至源音频信号中，其中噪声信号基于回放校正误差被整形。
根据本发明的这些和其他实施例，一种方法，用于消除在个人音频设备的换能器附近的周围音频声音，可包括接收表示周围音频声音的参考麦克风信号。所述方法还可包括接收表示换能器的输出及换能器处周围音频声音的误差麦克风信号。所述方法还可包括生成回放给收听者的源音频信号。所述方法还可包括通过调适对参考麦克风的输出进行滤波的自适应滤波器的响应以使在误差麦克风信号中的周围音频声音最小化，从参考麦克风的测量结果生成抗噪信号，应对在换能器的声输出处的周围音频声音的影响。所述方法还可包括通过利用辅助路径估计自适应滤波器对源音频信号进行滤波并调适辅助路径估计自适应滤波器的响应以使回放校正误差最小化，从源音频信号生成辅助路径估计，所述辅助路径估计自适应滤波器被构成为对源音频信号的电声路径进行建模，其中回放校正误差基于误差麦克风信号与辅助路径估计之差。所述方法还可包括将噪声信号注入至源音频信号中，其中噪声信号基于回放校正误差被整形。所述方法还可包括将抗噪信号与源音频信号进行组合以生成提供给换能器的音频信号。
根据本发明的这些和其他实施例，一种集成电路，用于实现个人音频设备的至少一部分，可包括输出、参考麦克风输入、误差麦克风输入和处理电路。输出可用于提供信号给换能器，所述信号既包括回放给收听者的源音频信号又包括抗噪信号，所述抗噪信号用于应对在换能器的声输出中的周围音频声音的影响。参考麦克风输入可用于接收表示周围音频声音的参考麦克风信号。误差麦克风输入可用于接收表示换能器的输出及换能器处周围音频声音的误差麦克风信号。处理电路可包括自适应滤波器，具有响应，从参考麦克风信号生成抗噪信号，其中所述响应被整形成与参考麦克风信号和回放校正误差一致，以及其中回放校正误差基于误差麦克风信号与辅助路径估计之差。处理电路还可包括：辅助路径估计滤波器，被构成为对源音频信号的电声路径进行建模且具有响应，从源音频信号生成辅助路径估计；辅助系数控制方块，通过调适辅助路径估计滤波器的响应以使回放校正误差最小化，所述辅助系数控制方块将辅助路径估计滤波器的响应整形成与源音频信号和回放校正误差一致；和噪声注入部，用于将噪声信号注入至源音频信号中，其中噪声信号基于回放校正误差被整形。
本发明的技术优势对于本领域技术人员而言从本文中所包括的图式、说明书和权利要求可以显而易见。实施例的目的和优点将至少通过在权利要求中特别指出的元件、功能及组合来实现和完成。
应当理解，前述大致说明和以下详细说明都为举例说明，且不限制本发明中所提出的权利要求。
附图说明
通过结合附图参考以下说明，可更完整地理解本发明实施例及其优点，其中相同附图标记表示相同功能，以及其中：
图1示出了根据本发明的实施例的无线移动电话；
图2为根据本发明的实施例在图1所示的无线电话内的选定电路的方块图；以及
图3为方块图，示出了根据本发明的实施例在图2编码解码器(CODEC)集成电路的实例性自适应消噪(ANC)电路内的选定信号处理电路和功能方块。
具体实施方式
本发明包括可在个人音频设备中实现的消噪技术及电路，诸如无线电话。个人音频设备包括ANC电路，所述ANC电路可测量周围声环境并生成信号，所述信号被注入喇叭(或其他换能器)输出中以消除周围声事件。参考麦克风可被设置为测量周围声环境，且个人音频设备可包括误差麦克风，用于控制抗噪信号的调适以消除周围音频声音以及用于校正自处理电路的输出通过换能器的电声路径。
现在参考图1，如根据本发明的实施例所示的无线电话10被示出为靠近人耳5。无线电话10为可采用根据本发明的实施例的技术的设备实例，但应当理解，在所示无线电话10中或在后续插图中所示的电路中呈现的元件或构成并非全部需要，以便实施在权利要求中陈述的本发明。无线电话10可包括换能器，诸如喇叭SPKR，所述喇叭SPKR再现由无线电话10接收的远距离语音，连同其他本地音频事件，诸如铃声、所存储的音频节目资料、注入以提供平衡会话感觉的近端语音(即，无线电话10的用户的语音)，以及需要通过无线电话10再现的其他音频(诸如网页源或由无线电话10接收的其他网络通信)及音频指示(诸如电池电量低指示及其他系统事件通知)。近距离语音麦克风NS可被设置为捕捉近端语音，所述近端语音自无线电话10发送至另一个(多个)会话参与者。
无线电话10可包括ANC电路和功能，所述ANC电路和功能将抗噪信号注入至喇叭SPKR中，以改良远距离语音及由喇叭SPKR再现的其他音频的清晰度。参考麦克风R可被设置用于测量周围声环境，且可被定位成远离用户嘴巴的典型位置，使得近端语音可在由参考麦克风R产生的信号中被最小化。另一个麦克风，误差麦克风E，可被设置为当无线电话10紧靠耳朵5时，通过测量与由最接近耳朵5的喇叭SPKR再现的音频组合的周围音频，进一步改良ANC操作。在无线电话10内的电路14可包括：音频CODEC集成电路(IC)20，所述音频CODEC集成电路20接收来自参考麦克风R、近距离语音麦克风NS和误差麦克风E的信号；及与其他集成电路的接口，诸如具有无线电话收发器的射频(RF)集成电路12。在本发明的一些实施例中，本文中所公开的电路和技术可并入单个集成电路中，所述单个集成电路包括控制电路及用于实现整个个人音频设备的其他功能，诸如MP3播放器单芯片集成电路。在这些和其他实施例中，本文中所公开的电路和技术可部分地或完全地以软件和/或固件实现，所述软件和/或固件具体表现为计算机可读介质且可由控制器或其他处理设备执行。
通常，本发明的ANC技术测量撞击在参考麦克风R上的周围声事件(相对于喇叭SPKR的输出和/或近端语音)，且通过还测量撞击在误差麦克风E上的相同周围声事件，无线电话10的ANC处理电路调适在喇叭SPKR的输出处从参考麦克风R的输出生成的抗噪信号以具有使在误差麦克风E处周围声事件的振幅最小化的特性。因为声路径P(z)自参考麦克风R延伸至误差麦克风E，所以ANC电路在消除电声路径S(z)的影响的同时有效地估计声路径P(z)，所述电声路径S(z)表示CODEC集成电路20的音频输出电路的响应及喇叭SPKR的声/电传递函数，包括在特定声环境下在喇叭SPKR与误差麦克风E之间的耦合，当无线电话10未紧贴着耳朵5时，所述耦合可能受到耳朵5的靠近及结构以及可靠近无线电话10的其他物理对象和人头结构影响。虽然所示无线电话10包括具有第三近距离语音麦克风NS的双麦克风ANC系统，但是本发明的一些方面可在未包括单独误差麦克风和参考麦克风的系统中或在使用近距离语音麦克风NS来执行参考麦克风R的功能的无线电话中实施。此外，在仅为音频回放而设计的个人音频设备中，通常不会包括近距离语音麦克风NS，且在不更改本发明范围的情况下，在下文更详细说明的电路中的近距离语音信号路径可以省略，绝不是使为输入而设的选项限于麦克风覆盖范围检测方案。此外，虽然图1中只示出了一个参考麦克风R和一个误差麦克风E，但是在不更改本发明范围的情况下，本文中所公开的电路和技术可适合于包括多个参考麦克风和/或误差麦克风的个人音频设备。
现在参考图2，在无线电话10内的选定电路如方块图所示。CODEC集成电路20可包括：模拟-数字转换器(ADC)21A，用于接收参考麦克风信号并生成参考麦克风信号的数字表示ref；ADC21B，用于接收误差麦克风信号并生成误差麦克风信号的数字表示err；和ADC21C，用于接收近距离语音麦克风信号并生成近距离语音麦克风信号的数字表示ns。CODEC集成电路20可从放大器A1生成输出，用于驱动喇叭SPKR，所述放大器A1可对数字-模拟转换器(DAC)23的输出进行放大，所述数字-模拟转换器(DAC)23接收组合器26的输出。组合器26可将来自内部音频源24的音频信号ia、由ANC电路30生成的抗噪信号(通过转换，所述抗噪信号具有与在参考麦克风信号ref中的噪声相同的极性且因此通过组合器26被减去)、来自ANC电路30的注入噪声以及近距离语音麦克风信号ns的一部分进行组合，使得无线电话10的用户可听到他或她自己与下行链路语音ds相关的声音，所述下行链路语音ds可从射频(RF)集成电路22被接收，且还可通过组合器26被组合。近距离语音麦克风信号ns还可被提供给RF集成电路22并可作为上行链路语音经由天线ANT发送至服务提供商。
现在参考图3，根据本发明的实施例，示出了ANC电路30的细节。自适应滤波器32可接收参考麦克风信号ref，且在理想情况下，可调适其传递函数W(z)为P(z)/S(z)以生成抗噪信号，所述抗噪信号可被提供给输出组合器，所述输出组合器将抗噪信号与将由换能器(以图2组合器26举例说明)再现的音频进行组合。自适应滤波器32的系数可由W系数控制方块31控制，所述W系数控制方块31使用信号的相关性来判定自适应滤波器32的响应，所述自适应滤波器32就最小均方意义来说通常使存在误差麦克风信号err中的参考麦克风信号ref的这些分量之间的误差最小化。通过W系数控制方块31比较的信号可为参考麦克风信号ref以及在图3中被标记为“PBCE”的回放校正误差，所述参考麦克风信号ref通过由滤波器34B提供的路径S(z)的响应的估计的副本进行整形，所述回放校正误差至少部分基于误差麦克风信号err。如下文更详细说明，可生成回放校正误差。
通过利用滤波器34B的路径S(z)的响应的估计的副本(响应SECOPY(z))来变换参考麦克风信号ref，并使所得信号与误差麦克风信号err之差最小化，自适应滤波器32可适应P(z)/S(z)的期望响应。除了误差麦克风信号err，通过W系数控制方块31与滤波器34B的输出进行比较的信号可包括已经通过滤波器响应SE(z)进行处理的大量反相修正的源音频信号(例如，下行链路音频信号ds和/或内部音频信号ia，所述下行链路音频信号ds和/或内部音频信号ia可与由噪声注入部40生成的噪声信号进行组合)，响应SECOPY(z)为响应SE(z)的副本。通过注入大量反相源音频信号，可防止自适应滤波器32适应存在误差麦克风信号err中的数量较大的源音频信号。然而，通过利用路径S(z)的响应估计来变换源音频信号的反相副本，从误差麦克风信号err中去除的源音频应当与在误差麦克风信号err处再现的源音频信号的预期形式相适应，因为电声路径S(z)为源音频信号到达误差麦克风E所选取的路径。滤波器34B本身可能不是自适应滤波器，但可具有可调节响应，所述可调节响应被调谐为与自适应滤波器34A的响应相适应，使得滤波器34B的响应跟踪自适应滤波器34A的调适。
为了实现以上所述，自适应滤波器34A可具有由SE系数控制方块33控制的系数，所述SE系数控制方块33可比较修正的源音频信号与回放校正误差。修正的源音频信号可包括具有由噪声注入部40生成的注入噪声且通过组合器42与总和源音频信号进行组合的源音频信号(例如，下行链路音频信号ds和/或内部音频信号ia)。回放校正误差可等于在通过组合器36去除源音频信号(通过自适应滤波器34A进行滤波以表示传送给误差麦克风E的期望回放音频)之后的误差麦克风信号err。SE系数控制方块33可使实际修正的源音频信号与存在误差麦克风信号err中的修正的源音频信号的分量相关。自适应滤波器34A可由此由修正的源音频信号自适应生成辅助估计信号，当从误差麦克风信号err中减去以生成回放校正误差时，所述辅助估计信号包括误差麦克风信号err中未归因于修正的源音频信号的含量。
如图2所示，ANC电路30还可生成注入噪声信号，所述注入噪声信号可与近距离语音信号ns、源音频信号和抗噪信号进行组合(例如，通过组合器26)。下文就图3而言更详细讨论所述注入噪声信号的生成。
如图3所示，与源音频信号组合的噪声信号可由噪声注入部40生成。噪声注入部40可包括白噪声源44，用于生成白噪声(例如，跨所有所关注频率具有恒定振幅的音频信号，诸如在人类听觉范围内的这些频率)。通过对白噪声信号进行滤波，频率整形滤波器46可生成噪声信号，其中频率整形滤波器的响应通过频率整形滤波器系数控制方块48整形成与回放校正误差一致。在一些实施例中，系数控制方块48实现自适应线性预测系数系统，所述自适应线性预测系数系统对回放校正误差的频谱进行估计。因此，由频率整形滤波器46生成的噪声信号可包括白噪声信号，所述白噪声信号经滤波使得白噪声信号在回放校正误差的频谱内的这些频率中被衰减或消除。
在一些实施例中，噪声注入部40可包括增益元件50，所述增益元件50被构成为使噪声信号衰减为基本上低于误差麦克风信号err的振幅的振幅，使得收听者基本上察觉不到噪声信号。在这些和其他实施例中，噪声注入部40可包括反相辅助路径估计滤波器52，具有与辅助路径估计滤波器的响应反相的响应，其中反相辅助路径估计滤波器52在噪声信号注入至源音频信号中之前将其响应施加于噪声信号，以消除对滤波器34A的辅助路径S(z)和辅助路径估计SE(z)的噪声信号的影响。
因此，由于注入噪声信号，包括噪声信号的修正的源音频信号可具有在所有所关注频率范围内的频谱含量，但是注入噪声信号可能强度足够低，使得收听者不会察觉到它，从而提供宽带信号，SE系数控制方块33可使用所述宽带信号来调适响应SE(z)，同时最低限度地影响收听者体验。
虽然图2和图3所示的实施例考虑了源音频信号、注入噪声信号和抗噪信号在组合器26处进行组合，但是在一些实施例中，修正的源音频信号(包括源音频信号和注入噪声的组合)却可与抗噪信号在组合器26处进行组合。
本领域普通技术人员应当明白，本发明包括对于本文中示范性实施例的所有更改、替换、变动、变形和修改。同样地，本领域普通技术人员应当明白，在适当的情况下，所附权利要求包括对于本文中示范性实施例的所有更改、替换、变动、变形和修改。此外，在所附权利要求中对于装置或系统或装置或系统的组件的引用包括所述装置、系统或组件，所述装置、系统或组件适应执行特定功能，被安排为执行特定功能，可执行特定功能，被构成为执行特定功能，能够执行特定功能，可操作为执行特定功能或操作为执行特定功能，无论它或所述特定功能是否启动、打开或开启，只要所述装置、系统或组件适应执行特定功能，被安排为执行特定功能，可执行特定功能，被构成为执行特定功能，能够执行特定功能，可操作为执行特定功能或操作为执行特定功能。
本文中陈述的所有实例和条件性语言旨在教学目的，以帮助读者理解本发明及发明者深化技术所提供的概念，且被解释为并不限于此类具体陈述的实例和条件。虽然已经详细说明本发明的实施例，但是应当理解，在不脱离本发明的精神和范围的情况下，可对本发明的实施例进行各种更改、替换和变形。
权利要求书(按照条约第19条的修改)
1.(取消)
2.一种个人音频设备，包括：
个人音频设备壳体；
换能器，耦接至所述壳体，用于再现音频信号，所述音频信号既包括回放给收听者的源音频信号又包括抗噪信号，所述抗噪信号用于应对在所述换能器的声输出中的周围音频声音的影响；
参考麦克风，耦接至所述壳体，用于提供表示所述周围音频声音的参考麦克风信号；
误差麦克风，耦接至所述壳体，靠近所述换能器，用于提供表示所述换能器的所述声输出及在所述换能器处的所述周围音频声音的误差麦克风信号；和
处理电路，所述处理电路包括：
自适应滤波器，具有响应，从所述参考麦克风信号生成抗噪信号，其中所述响应被整形成与所述参考麦克风信号和回放校正误差一致，以及其中所述回放校正误差基于所述误差麦克风信号与辅助路径估计之差；
辅助路径估计滤波器，被构成为对所述源音频信号的电声路径进行建模且具有响应，从所述源音频信号生成辅助路径估计；
辅助系数控制方块，通过调适所述辅助路径估计滤波器的响应以使回放校正误差最小化，所述辅助系数控制方块将所述辅助路径估计滤波器的响应整形成与所述源音频信号和所述回放校正误差一致；和
噪声注入部，用于将噪声信号注入至所述源音频信号中，其中所述噪声信号基于所述回放校正误差被整形，以及其中所述噪声注入部包括：
噪声源，用于生成白噪声信号；
频率整形滤波器，具有响应，从所述白噪声信号生成所述噪声信号；和
系数控制方块，所述系数控制方块将所述频率整形滤波器的响应整形成与所述回放校正误差一致。
3.根据权利要求2所述的个人音频设备，其中所述系数控制方块实现自适应线性预测系数系统，所述自适应线性预测系数系统对所述回放校正误差的频谱进行估计。
4.根据权利要求2所述的个人音频设备，其中所述噪声注入部包括增益元件，所述增益元件被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
5.根据权利要求2所述的个人音频设备，其中所述噪声注入部包括反相辅助路径估计滤波器，具有与所述辅助路径估计滤波器的响应反相的响应，其中所述反相辅助路径估计滤波器在所述噪声信号注入至所述源音频信号中之前将其响应施加于所述噪声信号。
6.根据权利要求5所述的个人音频设备，其中所述噪声注入部包括增益元件，所述增益元件被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
7.(取消)
8.一种方法，用于消除在个人音频设备的换能器附近的周围音频声音，所述方法包括：
接收表示周围音频声音的参考麦克风信号；
接收表示所述换能器的输出及在所述换能器处的所述周围音频声音的误差麦克风信号；
生成回放给收听者的源音频信号；
通过调适对所述参考麦克风的输出进行滤波的自适应滤波器的响应以使在所述误差麦克风信号中的周围音频声音最小化，由所述参考麦克风信号生成抗噪信号，应对在所述换能器的声输出处的周围音频声音的影响；
通过利用辅助路径估计自适应滤波器对所述源音频信号进行滤波并调适所述辅助路径估计自适应滤波器的响应以使回放校正误差最小化，从所述源音频信号自适应生成辅助路径估计，所述辅助路径估计自适应滤波器被构成为对所述源音频信号的电声路径进行建模，其中所述回放校正误差基于所述误差麦克风信号与所述辅助路径估计之差；
通过利用频率整形滤波器对白噪声信号进行滤波来生成所述噪声信号，其中所述频率整形滤波器的响应通过系数控制方块整形成与所述回放校正误差一致；
将噪声信号注入至所述源音频信号中，其中所述噪声信号基于所述回放校正误差被整形；以及
将所述抗噪信号与所述源音频信号进行组合以生成提供给所述换能器的音频信号。
9.根据权利要求8所述的方法，其中所述频率整形滤波器的响应基于自适应线性预测系数系统被整形，所述自适应线性预测系数系统对所述回放校正误差的频谱进行估计。
10.根据权利要求8所述的方法，还包括使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
11.根据权利要求8所述的方法，还包括在所述噪声信号注入至所述源音频信号中之前将反相辅助路径估计滤波器的响应施加于所述噪声信号，其中所述反相辅助路径估计滤波器的响应与所述辅助路径估计滤波器的响应反相。
12.根据权利要求8所述的方法，还包括使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
13.(取消)
14.一种集成电路，用于实现个人音频设备的至少一部分，所述集成电路包括：
输出，用于提供信号给换能器，所述信号既包括回放给收听者的源音频信号又包括抗噪信号，所述抗噪信号用于应对在所述换能器的声输出中的周围音频声音的影响；
参考麦克风输入，用于接收表示所述周围音频声音的参考麦克风信号；
误差麦克风输入，用于接收表示所述换能器的输出及在所述换能器处的所述周围音频声音的误差麦克风信号；和
处理电路，所述处理电路包括：
自适应滤波器，具有响应，从所述参考麦克风信号生成抗噪信号，其中所述响应被整形成与所述参考麦克风信号和回放校正误差一致，以及其中所述回放校正误差基于所述误差麦克风信号与辅助路径估计之差；
辅助路径估计滤波器，被构成为对所述源音频信号的电声路径进行建模且具有响应，从由所述源音频信号生成辅助路径估计；
辅助系数控制方块，通过调适所述辅助路径估计滤波器的响应以使回放校正误差最小化，所述辅助系数控制方块将所述辅助路径估计滤波器的响应整形成与所述源音频信号和所述回放校正误差一致；和
噪声注入部，用于将噪声信号注入至所述源音频信号中，其中所述噪声信号基于所述回放校正误差被整形，以及其中所述噪声注入部包括：
噪声源，用于生成白噪声信号；
频率整形滤波器，具有响应，从所述白噪声信号生成所述噪声信号；和
系数控制方块，所述系数控制方块将所述频率整形滤波器的响应整形成与所述回放校正误差一致。
15.根据权利要求14所述的集成电路，其中所述系数控制方块实现自适应线性预测系数系统，所述自适应线性预测系数系统对所述回放校正误差的频谱进行估计。
16.根据权利要求14所述的集成电路，其中所述噪声注入部包括增益元件，所述增益元件被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
17.根据权利要求14所述的集成电路，其中所述噪声注入部包括反相辅助路径估计滤波器，具有与所述辅助路径估计滤波器的响应反相的响应，其中所述反相辅助路径估计滤波器在所述噪声信号注入至所述源音频信号中之前将其响应施加于所述噪声信号。
18.根据权利要求14所述的集成电路，其中所述噪声注入部包括增益元件，所述增益元件被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。

Claims (18)

1.一种个人音频设备，包括：
个人音频设备壳体；
换能器，耦接至所述壳体，用于再现音频信号，所述音频信号既包括回放给收听者的源音频信号又包括抗噪信号，所述抗噪信号用于应对在所述换能器的声输出中的周围音频声音的影响；
参考麦克风，耦接至所述壳体，用于提供表示所述周围音频声音的参考麦克风信号；
误差麦克风，耦接至所述壳体，靠近所述换能器，用于提供表示所述换能器的所述声输出及在所述换能器处的所述周围音频声音的误差麦克风信号；和
处理电路，所述处理电路包括：
自适应滤波器，具有响应，从所述参考麦克风信号生成抗噪信号，其中所述响应被整形成与所述参考麦克风信号和回放校正误差一致，以及其中所述回放校正误差基于所述误差麦克风信号与辅助路径估计之差；
辅助路径估计滤波器，被构成为对所述源音频信号的电声路径进行建模，且具有响应，从所述源音频信号生成辅助路径估计；
辅助系数控制方块，通过调适所述辅助路径估计滤波器的响应以使回放校正误差最小化，将所述辅助路径估计滤波器的响应整形成与所述源音频信号和所述回放校正误差一致；和
噪声注入部，用于将噪声信号注入至所述源音频信号中，其中所述噪声信号基于所述回放校正误差被整形。
2.根据权利要求1所述的个人音频设备，其中所述噪声注入部包括：
噪声源，用于生成白噪声信号；
频率整形滤波器，具有响应，从所述白噪声信号生成所述噪声信号；和
系数控制方块，所述系数控制方块将所述频率整形滤波器的响应整形成与所述回放校正误差一致。
3.根据权利要求2所述的个人音频设备，其中所述系数控制方块实现自适应线性预测系数系统，所述自适应线性预测系数系统对所述回放校正误差的频谱进行估计。
4.根据权利要求2所述的个人音频设备，其中所述噪声注入部包括增益元件，所述增益元件被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
5.根据权利要求2所述的个人音频设备，其中所述噪声注入部包括反相辅助路径估计滤波器，具有与所述辅助路径估计滤波器的响应反相的响应，其中所述反相辅助路径估计滤波器在所述噪声信号注入至所述源音频信号中之前，将其响应施加于所述噪声信号。
6.根据权利要求2所述的个人音频设备，其中所述噪声注入部包括：
增益元件，被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号；和
反相辅助路径估计滤波器，具有与所述辅助路径估计滤波器的响应反相的响应，其中所述反相辅助路径估计滤波器在所述噪声信号注入至所述源音频信号中之前，将其响应施加于所述噪声信号。
7.一种方法，用于消除在个人音频设备的换能器附近的周围音频声音，所述方法包括：
接收表示周围音频声音的参考麦克风信号；
接收表示所述换能器的输出及在所述换能器处的所述周围音频声音的误差麦克风信号；
生成回放给收听者的源音频信号；
通过调适对所述参考麦克风的输出进行滤波的自适应滤波器的响应，以使在所述误差麦克风信号中的所述周围音频声音最小化，从所述参考麦克风信号生成抗噪信号，应对在所述换能器的声输出处的周围音频声音的影响；
通过利用辅助路径估计自适应滤波器对所述源音频信号进行滤波并调适所述辅助路径估计自适应滤波器的响应以使回放校正误差最小化，从所述源音频信号自适应生成辅助路径估计，所述辅助路径估计自适应滤波器被构成为对所述源音频信号的电声路径进行建模，其中所述回放校正误差基于所述误差麦克风信号与所述辅助路径估计之差；
将噪声信号注入至所述源音频信号中，其中所述噪声信号基于所述回放校正误差被整形；以及
将所述抗噪信号与所述源音频信号进行组合以生成提供给所述换能器的音频信号。
8.根据权利要求7所述的方法，还包括通过利用频率整形滤波器对白噪声信号进行滤波来生成所述噪声信号，其中所述频率整形滤波器的响应被整形成与所述回放校正误差一致。
9.根据权利要求8所述的方法，其中所述频率整形滤波器的响应基于自适应线性预测系数系统被整形，所述自适应线性预测系数系统对所述回放校正误差的频谱进行估计。
10.根据权利要求8所述的方法，还包括使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
11.根据权利要求8所述的方法，还包括在所述噪声信号注入至所述源音频信号中之前，将反相辅助路径估计滤波器的响应施加于所述噪声信号，其中所述反相辅助路径估计滤波器的响应与所述辅助路径估计滤波器的响应反相。
12.根据权利要求8所述的方法，还包括：
使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号；以及
在所述噪声信号注入至所述源音频信号中之前，将反相辅助路径估计滤波器的响应施加于所述噪声信号，其中所述反相辅助路径估计滤波器的响应与所述辅助路径估计滤波器的响应反相。
13.一种集成电路，用于实现个人音频设备的至少一部分，所述集成电路包括：
输出，用于提供信号给换能器，所述信号既包括回放给收听者的源音频信号又包括抗噪信号，所述抗噪信号用于应对在所述换能器的声输出中的周围音频声音的影响；
参考麦克风输入，用于接收表示所述周围音频声音的参考麦克风信号；
误差麦克风输入，用于接收表示所述换能器的输出及在所述换能器处的所述周围音频声音的误差麦克风信号；和
处理电路，所述处理电路包括：
自适应滤波器，具有响应，从所述参考麦克风信号生成抗噪信号，其中所述响应被整形成与所述参考麦克风信号和回放校正误差一致，以及其中所述回放校正误差基于所述误差麦克风信号与辅助路径估计之差；
辅助路径估计滤波器，被构成为对所述源音频信号的电声路径进行建模且具有响应，从所述源音频信号生成辅助路径估计；
辅助系数控制方块，通过调适所述辅助路径估计滤波器的响应以使回放校正误差最小化，将所述辅助路径估计滤波器的响应整形成与所述源音频信号和所述回放校正误差一致；和
噪声注入部，用于将噪声信号注入至所述源音频信号中，其中所述噪声信号基于所述回放校正误差被整形。
14.根据权利要求13所述的集成电路，其中所述噪声注入部包括：
噪声源，用于生成白噪声信号；
频率整形滤波器，具有响应，从所述白噪声信号生成所述噪声信号；和
系数控制方块，所述系数控制方块将所述频率整形滤波器的响应整形成与所述回放校正误差一致。
15.根据权利要求14所述的集成电路，其中所述系数控制方块实现自适应线性预测系数系统，所述自适应线性预测系数系统对所述回放校正误差的频谱进行估计。
16.根据权利要求14所述的集成电路，其中所述噪声注入部包括增益元件，所述增益元件被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号。
17.根据权利要求14所述的集成电路，其中所述噪声注入部包括反相辅助路径估计滤波器，具有与所述辅助路径估计滤波器的响应反相的响应，其中所述反相辅助路径估计滤波器在所述噪声信号注入至所述源音频信号中之前，将其响应施加于所述噪声信号。
18.根据权利要求14所述的集成电路，其中所述噪声注入部包括：增益元件，被构成为使所述噪声信号衰减为基本上低于所述误差麦克风信号的振幅的振幅，使得收听者基本上察觉不到所述噪声信号；和反相辅助路径估计滤波器，具有与所述辅助路径估计滤波器的响应反相的响应，其中所述反相辅助路径估计滤波器在所述噪声信号注入至所述源音频信号中之前，将其响应施加于所述噪声信号。
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JP6408586B2 (ja) 2018-10-17
JP2016531329A (ja) 2016-10-06
US9666176B2 (en) 2017-05-30
WO2015038255A1 (en) 2015-03-19
CN105723447B (zh) 2020-02-18
US20150078572A1 (en) 2015-03-19
KR102150844B1 (ko) 2020-09-02

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