CN103765505B - 在适应性噪音消除个人音频设备中的扬声器损坏阻止 - Google Patents

在适应性噪音消除个人音频设备中的扬声器损坏阻止 Download PDF

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CN103765505B
CN103765505B CN201280027297.XA CN201280027297A CN103765505B CN 103765505 B CN103765505 B CN 103765505B CN 201280027297 A CN201280027297 A CN 201280027297A CN 103765505 B CN103765505 B CN 103765505B
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N·卡瓦特拉
J·D·亨德里克斯
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Abstract

一种个人音频设备，例如无线电话，包括噪音消除电路，其适应性地从参考麦克风信号产生抗噪音信号，并且将该抗噪音信号注入到扬声器或其他传感器输出以导致周围音频声音的消除。处理电路监控抗噪音信号的位准，确定抗噪音信号会导致损坏传感器并且调整抗噪音信号的产生以便阻止损坏传感器。

Description

在适应性噪音消除个人音频设备中的扬声器损坏阻止
技术领域
本发明总体上涉及包括噪音消除的人音频设备例如无线电话，并且更具体地，涉及一种在其中当仍然提供适应性噪音消除时阻止对输出传感器的损坏的个人音频设备。
背景技术
无线电话例如移动电话/蜂窝式电话、无绳电话及其他消费性音频装置例如mp3播放器应用广泛。可通过使用麦克风量测周围声音事件及随后使用信号处理将抗噪音信号插入至装置的输出中以消除周围声音事件以提供噪音消除而改进这些装置在清晰度方面的效能。
由于围绕个人音频设备例如无线电话的声音环境取决于所存在的噪音源及装置本身的位置可能发生极大变化，故需调适噪音消除以考虑这些环境变化。但是，适应性噪音消除电路可能是复杂的，消耗额外电力且在特定情况下可能产生非所要的结果。
因此，需提供一种在可变声环境中提供噪音消除的个人音频设备，包含无线电话。
发明内容
以一种个人音频设备、一种操作方法及一种集成电路完成提供在可变声音环境中提供噪音消除的个人音频设备的上述目的。
个人音频设备包含外壳，传感器安装在外壳上用于重现包含用于对听者重播的源音频及用于对抗周围音频声音在传感器的声音输出中的影响的抗噪音信号两者的音频信号。参考麦克风安装在外壳上以提供指示周围音频声音的参考麦克风信号。个人音频装置进一步包含外壳内的适应性噪音消除(ANC)处理电路，用于适应性地从参考麦克风信号产生抗噪音信号以便抗噪音信号导致周围音频声音的显著消除。ANC处理电路监控抗噪音信号的位准，确定抗噪音信号会导致损坏传感器并且调整抗噪音信号的产生以便阻止对传感器的损坏。集成电路包括执行该监控和调整的处理电路，并且所述方法是操作该集成电路的方法。
如附图所示，可更具体地从本发明的优选实施例的下列描述中了解本发明的上述及其他目的、特征及优点。
附图说明
图1为根据本发明的实施例的无线电话10的图解。
图2为根据本发明的实施例的无线电话10内的电路的方框图。
图3为描绘根据本发明的实施例的图2的编解码器(CODEC)集成电路20的ANC电路30内的信号处理电路及功能块的方框图。
图4为描绘根据本发明的实施例的图3的扬声器损坏阻止电路60的细节的方框图。
图5为描绘根据本发明的集成电路内的信号处理电路及功能块的方框图。
具体实施方式
本发明涵盖噪音消除技术及可在例如无线电话的个人音频设备中实施的电路。个人音频设备包含适应性噪音消除(ANC)电路，该适应性噪音消除(ANC)电路测量周围声音环境并产生注入扬声器(或其他传感器)输出中以消除周围声音事件的信号。ANC电路监控抗噪音信号的位准以确定对扬声器或其他传感器的损坏是否最小并且如果万一发生扬声器损坏调整抗噪音信号。
现参考图1，根据本发明的实施例所示的无线电话10展示为邻近人的耳部5。所示的无线电话10为可采用根据本发明的实施例的技术的装置的实例，但是应了解并非需要所示的无线电话10或后续图解中所描绘的电路中所体现的元件或组态的全部以实践申请专利范围中所述的本发明。无线电话10包含传感器，例如扬声器SPKR，该传感器重现无线电话10所接收的远端语音连同其他本端源音频例如铃声、所储存的音频节目材料、近端语音(即无线电话10的使用者的语音)的注入以提供平衡的会话感知及需通过无线电话10重现的其他音频，例如来自网页的源或无线电话10所接收的其他网络通信及音频指示，例如电池低及其他系统事件通告。提供近端语音麦克风NS以捕捉近端语音，该近端语音从无线电话10传输至其他会话参与者。
无线电话10包含适应性噪音消除(ANC)电路及特征，它们将抗噪音信号注入至扬声器SPKR中以改进远端语音及扬声器SPKR所重现的其他音频的清晰度。参考麦克风R被提供用于测量周围声音环境且为定位为远离使用者的嘴部的典型位置，使得近端语音在参考麦克风R所产生的信号中最小化。提供第三麦克风(误差麦克风E)以通过当无线电话10紧邻耳部5时提供周围音频与靠近耳部5的扬声器SPKR所重现的音频的组合的测量而进一步改进ANC操作。无线电话10内的例示性电路14包含一音频CODEC集成电路20，该音频CODEC集成电路20接收来自参考麦克风R、近端语音麦克风NS及误差麦克风E的信号并与其他集成电路例如含有无线电话收发器的射频(RF)集成电路12对接。在本发明的其他实施例中，本文所揭示的电路及技术可结合到单个集成电路，该单个集体电路含有用于实施整个个人音频设备，例如MP3播放器单晶片集成电路的控制电路及其他功能性。
一般而言，本发明的ANC技术测量影响参考麦克风R的环境声音事件(与扬声器SPKR和/或近端语音的输出相反)，且也通过测量影响误差麦克风E上的相同环境声音事件，所示的无线电话10的ANC处理电路将从参考麦克风R的输出产生的抗噪音信号调适为具有使误差麦克风E上的环境声音事件的振幅最小化的特性。由于声音路径P(z)从参考麦克风R延伸至误差麦克风E，所以ANC电路实质上估计声音路径P(z)结合去除电声路径S(z)的影响。电声路径S(z)代表CODEC集成电路20的音频输出电路的响应及扬声器SPKR的声/电转移函数(包含特定声环境中扬声器SPKR与误差麦克风E之间的耦合)，其受耳部5的近接性和结构和当无线电话未牢固地压至耳部5时可能邻近无线电话10的其他实物和人的头部结构的影响。虽然所示的无线电话10包含具有第三近端语音麦克风NS的双麦克风ANC系统，但是本发明的一些方面可实践为不包含单独误差麦克风及参考麦克风的系统，或者无线电话使用近端语音麦克风NS以执行参考麦克风R的功能。此外，在仅设计用于音频播放的个人音频设备中，通常不包含近端语音麦克风NS且在不改变本发明的范畴的情况下可省略下文更详细描述的电路中的近端语音信号路径。
现参考图2，无线电话10内的电路以方框图展示。CODEC集成电路20包含：模数转换器(ADC)21A，其用于接收参考麦克风信号及产生参考麦克风信号的数位表示ref；ADC 21B，其用于接收误差麦克风信号及产生误差麦克风信号的数位表示err：及ADC 21C，其用于接收近端语音麦克风信号及产生近端语音麦克风信号的数位表示ns，CODEC集成电路20从放大器A1产生用于驱动扬声器SPKR的输出，该放大器A1放大接收组合器26的输出的数模转换器(DAC)23的输出。组合器26组合来自内部音频源24的音频信号和ANC电路30所产生的抗噪音信号(该抗噪音信号已知具有与参考麦克风信号ref中的噪音相同的极性且因此被组合器26减除)。组合器26还注入近端语音信号ns的一部分以便无线电话10的使用者听到其自己与下行链路语音ds成适当关联的声音，该下行链路语音ds为接收自射频(RF)集成电路22且也被组合器26组合。近端语音信号也提供至RF集成电路22且作为上行链路语音经由天线ANT传输给移动电话服务提供者。
现参考图3，根据本发明的实施例展示ANC电路30的细节。适应性滤波器32接收参考麦克风信号ref且在理想情况下调适它的转移函数W(z)为P(z)/S(z)以产生抗噪音信号。通过系数控制块31控制适应性滤波器32的系数，该系数控制块31使用两个信号的相关性判定适应性滤波器32的响应，该适应性滤波器32通常在最小均方意义上使在参考麦克风信号ref的这些分量与误差麦克风信号err之间的误差最小化。通过W系数控制块31比较的信号为如通过滤波器34B所提供的路径S(z)的响应的估计的拷贝而塑形的参考麦克风信号ref及包含误差麦克风信号err的另一信号。通过用路径S(z)的响应的估计的拷贝SECOPY(z)变换参考麦克风信号ref并且使所得信号与误差麦克风信号err之间的差异最小化，适应性滤波器32调适为P(z)/S(z)的所要的响应，通过调适以从参考麦克风信号ref中去除应用SECOPY(z)响应的影响。除误差麦克风信号err以外，通过W系数控制块31与滤波器34B的输出作比较的信号也包含已通过滤波器响应SE(z)处理的相反数量的下行链路音频信号ds，其中响应SECOPY(z)是一拷贝。通过注入相反数量的下行链路音频信号ds，防止适应性滤波器32调适为误差麦克风信号err中所存在的相对大量下行链路音频，且通过用路径S(z)的响应的估计变换下行链路音频信号ds的该相反拷贝，在比较前从误差麦克风信号err去除的下行链路音频应与误差麦克风信号err上重现的下行链路音频信号ds的预期版本匹配，因为S(z)的电路径及声音路径为下行链路音频信号ds到达误差麦克风E所采用的路径。
为了实施上述内容，适应性滤波器34A具有由SE系数控制块33控制的系数，该SE系数控制块33在上述经过滤的下行链路音频信号ds去除后比较下行链路音频信号ds和误差麦克风信号err，该下行链路音频信号ds已通过适应性滤波器34A过滤以代表递送至误差麦克风E的预期下行链路音频且通过组合器36A从适应性滤波器34A的输出去除。SE系数控制块33使实际下行链路语音信号ds与误差麦克风信号err中所存在的下行链路音频信号ds的分量相关联。适应性滤波器34A由此经调适以从下行链路音频信号ds产生一信号，在从误差麦克风信号err减除时，该信号含有并非归因于下行链路音频信号ds的误差麦克风信号err的含量。如下文更详细地揭示，事件监督控制逻辑电路38响应于与本发明的各种实施例一致的各种事件来执行各种动作。
因为适应性滤波器32可以具有取决于W系数控制31调适适应性滤波器32的响应的环境的在不同频率处的宽泛增益范围，所以由ANC电路30产生的抗噪音信号会呈现导致损坏扬声器SPKR的较高幅度，尤其是在扬声器SPKR具有较差音频响应的低频率处。会发生较高的幅度是因为W系数控制31通常将不管扬声器SPKR的频率响应，试图通过升高适应性滤波器32在那些频率带中的增益，消除任何低频率周围声音事件。并且较低频率信号分量会比较高频率分量激励对扬声器SPKR更大损坏的共振。因此，扬声器损坏阻止电路60包括在ANC处理20中以处理抗噪音信号以便阻止对扬声器SPKR的损坏。
现在参考图4，根据本发明的实施例展示出扬声器损坏阻止电路60的细节。从适应性滤波器32的输出接收输入信号in，并且乘法器66A应用信号位准检测器64A确定的可变衰减值atten1，该信号位准检测器64A检测由低通滤波器62产生的输入信号in的已过滤版本的位准。低通滤波器62从输入信号in去除较高频率分量，例如大于500Hz的频率分量，并且因此几乎完全由在位于小于500Hz的频率范围内的输入信号in中的能量确定衰减值atten1。乘法器66A提供增益控制块，该增益控制块不过滤输入信号in地调整输入信号in的位准，即不改变输入信号in的频谱，仅改变整个增益。另一个乘法器66B提供第二增益控制单元，该控制单位根据由第二信号位准检测器64B从第一乘法器66A的未过滤的输出确定的衰减值atten2，调整第一乘法器66A的输出的位准。在示出实施例中的信号位准检测器64A和64B是阈值检测器，即一旦到达信号位准检测器64A和64B的相应信号位准超过预定阈值时，应用衰减值atten1和atten2。并且，衰减值atten1和atten2随着位准的变化是这样的，应用无限压缩比，即衰减值atten1和atten2改变来确保相应信号位准不超过相应阈值。因此，低通滤波器62、信号位准检测器64A和乘法器66A构成第一软限制器，而信号位准检测器64B和乘法器66B构成第二软限制器，在本发明的其他实施例中，压缩比可以是小于无限的，并且可以省略阈值检测，以便应用纯压缩，而非有限压缩。
此外，当第一和第二限制器任意一个或两者有效时，并且因为适应性滤波器控制方程不再适用，事件检测和控制块38作用来冻结W(z)的调适，即给W系数控制块31发送信号来停止改变适应性滤波器32的系数值直到两个信号位准检测器64A和64B指示不再应用限制到抗噪音信号。
现参考图5，展示根据本发明的实施例的ANC系统的方框图，如可以在CODEC集成电路20内实施。通过△-∑ADC 41A产生参考麦克风信号ref，该△-∑ADC 41A以64倍超取样操作且其输出通过取样器(decimator)42A降低取样至一半以产生32倍超取样信号。△-∑塑形器43A在频带外散布影像的能量，其中并列一对滤波器级44A及44B的所待响应将具有显著响应。滤波器级44B具有固定响应WFIXED(Z)，该固定响应WFIXED(Z)通常经预定以提供针对典型使用者的无线电话10的特定设计的P(z)/S(z)的估计下的起始点。通过适应性滤波器级44A提供P(z)/S(z)的估计的响应的适应性部分WADAPT(Z)，该适应性滤波器级44A为通过泄漏最小均方(LMS)系数控制器54A控制。当未提供误差输入导致泄漏LMS系数控制器54A调适时，泄漏LMS系数控制器54A泄漏，这是因为响应随时间而正规化为平坦或另外预定的响应。提供泄漏控制器以防止在特定环境状况下可能出现的长期不稳定且一般使系统针对ANC响应的特定敏感性方面更稳健。
如在图3的示例中，通过作为路径S(z)的估计的拷贝的过滤器响应SECOPY(z)以及通过具有响应SECOPY(z)的滤波器51过滤参考麦克风信号ref，该滤波器51的输出通过取样器52A降低到1/32以产生基频音频信号，该基频音频信号经由无限脉冲响应(IIR)滤波器53A提供至泄漏LMS 54A。通过△-∑ADC 41C产生误差麦克风信号err，该△-∑ADC 41C以64倍超取样操作且其输出通过取样器42B取样两倍至一半以产生32倍超取样信号。如图3的系统中，通过组合器46C将已通过适应性滤波器过滤以施加路径S(z)的估计响应的数量的下行链路音频ds从误差麦克风信号err去除，该组合器46C的输出通过取样器52C取样至1/32倍以产生基频音频信号，该基频音频信号经由无限脉冲响应(IIR)滤波器53B提供至泄漏LMS 54A。通过另外并列的一组适应性滤波器级55A及55B产生响应S(z)，其中滤波器级55B具有固定响应SEFIXED(z)，且其中另一滤波器级55A具有通过泄漏LMS系数控制器54B控制的适应性响应SEADAPT(z)。通过组合器46E组合适应性滤波器级55A与55B的输出。类似于上述滤波器响应W(z)的实施方案，滤波器响应SEFIXED(z)通常为已知在各种操作状况下针对电/声路径S(z)提供合适起始点的预定响应。在图5的系统中提供单独控制值以控制具有响应SECOPY(z)的适应性滤波器51，该适应性滤波器51展示为单个适应性滤波器级。但是，适应性滤波器51替代地可用两个并列级实施，且用于控制适应性滤波器级55A的相同控制值随后可用于控制在适应性滤波器51的实施方案中的可调适级。至泄漏LMS控制块54B的输入也为基频，该输入为由在组合器46C已去除从通过另一组合器46E组合的适应性滤波器级55A及滤波器级55B的组合输出产生的信号之后，通过降低至1/32取样的取样器52B取样的下行链路音频信号ds提供。组合器46C的输出代表去除具有归因于下行链路音频信号ds的分量的误差麦克风信号err，该误差麦克风信号err在通过取样器52B取样后提供至LMS控制块54B。至LMS控制块54B的另一输入为取样器52C所产生的基频信号。
基频及超取样信号的上述配置提供用于简化的控制及适应性控制块例如泄漏LMS控制器54A及54B中所消耗的电力的减小，同时提供经由在超取样速率下实施适应性滤波器级44A至44B、55A至55B及适应性滤波器51而赋予的分接头灵活性。图5的系统的其余部分包含组合器46D，该组合器46D将下行链路音频ds与内部音频ia及已经由∑-△ADC 41B产生并通过侧音衰减器56过滤的近端语音的一部分组合以防止回馈状况。组合器46D的输出为经由∑-△塑形器43B塑形，该∑-△塑形器43B提供输入到已塑形以偏移影像至频带之外的滤波器级55A及55B，其中滤波器级55A及55B将具有显著响应。
根据本发明的实施例，组合器46D的输出也与已通过控制链处理的适应性滤波器级44A至44B的输出组合，该控制链包含针对滤波器级每个的相应硬静音块45A、45B、组合硬静音块45A、45B的输出的组合器46A，当开始发生或结束ANC操作时渐升增益或渐降抗噪音通道的增益的软静音器47，及随后软限制器48以产生抗噪音信号。该抗噪音信号通过组合器46B从组合器46D的源音频输出中减除。在本发明中，软限制器48包括如上述关于图3和图4描述的扬声器损坏阻止电路。组合器46B的输出通过内插器49插入两倍且随后通过在64倍超取样速率下操作的∑-△DAC 50重现。DAC 50的输出被提供至放大器Al，该放大器A1产生递送至扬声器SPKRZ的信号。
事件检测和控制块38接收事件检测的各种输入，例如取样器52C的输出，其代表ANC系统如何良好地消除如在误差麦克风E处测量的音频噪音，取样器52A的输出，其代表由路径SE(z)塑形的周围声音环境、下行链路音频信号ds和近端语音信号ns。取决于检测的声音事件，或者其他环境因素例如无线电话10相对于耳部5的位置，事件检测和控制块38将产生各种输出，该输出为了简洁在图5中未示出，但是该输出在其他元件之中，可以控制是否应用硬静音块45A-45B，静音块47和限制块48的特性，是否冻结或复位泄漏LMS控制块54A和54B，并且在本发明的一些实施例中，选择什么样的固定响应应用适应性滤波器例如适应性滤波器级44B和55B的固定部分。
图5的系统以及图2至图4的例示性电路中的每个或一些元件可直接实施为逻辑电路或通过处理器例如执行程序指令的数字信号处理(DSP)核实施，这些程序指令执行例如适应性滤波及LMS系数计算的操作。虽然DAC及ADC级通常用专用混合信号电路实施，但是本发明的ANC系统的架构通常适用于混合方式，其中举例而言逻辑可用于设计的高度超取样区段，同时选择程序代码或微程序代码驱动的处理元件用于较复杂但是较低速率的操作，例如计算适应性滤波器的分接头和/或响应所检测的事件例如本文所述的事件。
虽然已特别参考本发明的较佳实施例展示及描述本发明，但是本领域的技术人员了解可在不脱离本发明的精神及范围的情况下在其中进行上述及其他形式及细节的变化。

Claims (25)

1.一种个人音频设备，包括：
个人音频设备外壳；
传感器，其为安装在该外壳上用于重现一音频信号，该音频信号包含用于对听者播放的源音频及用于对抗周围音频声音在该传感器的声音输出中的影响的抗噪音信号两者；
参考麦克风，其为安装在该外壳上用于提供指示所述周围音频声音的参考麦克风信号；
误差麦克风，其安装在该外壳上，提供指示传感器的声音输出的误差麦克风信号；以及
处理电路，其在该外壳内用于从参考麦克风信号适应性地产生抗噪音信号以便抗噪音信号导致周围音频声音的显著消除，并且其中处理电路还监控抗噪音信号的位准，确定抗噪音信号会导致损坏传感器并且调整抗噪音信号的产生以便阻止损坏传感器；并且其中所述处理电路执行具有塑形抗噪音信号的响应以减少周围音频声音在误差麦克风信号中的存在的适应性滤波器，并且其中处理电路响应于确定抗噪音信号会导致损坏传感器而进一步冻结适应性滤波器的调适，以使得所述适应性滤波器的响应保持恒定，同时所述处理电路调整所述抗噪音信号的产生以防止损坏传感器。
2.如权利要求1所述的个人音频设备，其中所述处理电路响应于确定抗噪音信号已经超过第一阈值而限制或压缩抗噪音信号。
3.如权利要求2所述的个人音频设备，其中所述处理电路响应于确定抗噪音信号具有已经超过第一阈值的低频率分量而第一限制或第一压缩抗噪音信号以产生经处理的抗噪音信号，其中所述经处理的抗噪音信号被提供给所述传感器。
4.如权利要求3所述的个人音频设备，其中所述处理电路响应于确定经处理的抗噪音信号的全带宽量已经超过第二阈值而在提供所述经处理的抗噪音信号给传感器之前第二限制或第二压缩第一限制或第一压缩所述经处理的抗噪音信号的结果。
5.如权利要求4所述的个人音频设备，其中响应于确定所述抗噪音信号的低频率分量已经超过第一阈值，处理电路冻结适应性滤波器的调适。
6.如权利要求5所述的个人音频设备，其中如果所述经处理的抗噪音信号的全带宽已经超过第二阈值，那么处理电路也冻结适应性滤波器的调适。
7.如权利要求1所述的个人音频设备，其中所述处理电路响应于确定抗噪音信号具有已经超过第一阈值的低频率分量而第一限制或第一压缩抗噪音信号以产生经处理的抗噪音信号，并且响应于确定所述经处理的抗噪音信号的全带宽已经超过第二阈值而第二限制或第二压缩所述经处理的抗噪音信号，并且其中如果所述抗噪音信号已经超过第一阈值或所述经处理的抗噪音信号已经超过第二阈值，那么处理电路冻结适应性滤波器的调适。
8.如权利要求1所述的个人音频设备，其中所述个人音频设备是还包括用于接收作为下行链路音频信号的源音频的收发器的无线电话。
9.如权利要求1所述的个人音频设备，其中所述个人音频设备是音频录音重放设备，其中源音频是程序音频信号。
10.一种防止有适应性抗噪音的个人音频设备的传感器损坏的方法，所述方法包括：
用参考麦克风测量周围音频声音；
从所述测量的结果，适应性地产生抗噪音信号，用于对抗周围音频声音在传感器的声音输出中的效果；
将抗噪音信号与源音频信号组合；
提供所述组合的结果给传感器；
利用误差麦克风测量传感器的声音输出，其中所述适应性产生，执行适应性滤波器，所述适应性滤波器具有塑形抗噪音信号的响应以减少周围音频声音在测量传感器的声音输出的结果中的存在；
监控抗噪音信号的位准；
确定抗噪音信号会导致损坏传感器；以及
调整抗噪音信号以便阻止损坏传感器；以及
响应于确定抗噪音信号会导致损坏传感器，冻结适应性传感器的调适，以使得所述适应性滤波器的响应保持恒定，同时所述调整调整所述抗噪音信号的产生以防止损坏传感器。
11.如权利要求10所述的方法，其中所述调整包括响应于确定抗噪音信号已经超过第一阈值而限制或压缩抗噪音信号以产生经处理的抗噪音信号，且，其中所述组合将所述经处理的抗噪音信号与所述源音频信号组合。
12.如权利要求11所述的方法，其中限制或压缩包括响应于抗噪音信号具有已经超过所述第一阈值的低频率分量的第一限制或第一压缩抗噪音信号以产生经处理的抗噪音信号。
13.如权利要求12所述的方法，还包括响应于确定所述经处理的抗噪音信号的全带宽量已经超过第二阈值而第二限制或第二压缩所述经处理的抗噪音信号。
14.如权利要求13所述的方法，其中响应于确定抗噪音信号的低频率分量已经超过第一阈值，执行所述冻结。
15.如权利要求14所述的方法，其中还响应于确定所述经处理的抗噪音信号的全带宽已经超过第二阈值而执行所述冻结。
16.如权利要求15所述的方法，其中响应于确定所述抗噪音信号已经超过第一阈值或所述经处理的抗噪音信号已经超过第二阈值来执行所述冻结。
17.如权利要求10所述的方法，其中所述个人音频设备是无线电话，并且其中所述方法还包括接收作为下行链路音频信号的源音频。
18.如权利要求10所述的方法，其中个人音频设备是音频录音重放设备，其中源音频是程序音频信号。
19.一种用于执行个人音频设备至少一部分的集成电路，包括：
输出，用于提供信号给传感器，该信号包含用于对听者重放的源音频及用于对抗周围音频声音在该传感器的声音输出中的影响的抗噪音信号两者；
参考麦克风输入，用于接收指示所述周围音频声音的参考麦克风信号；
误差麦克风输入，其用于接收指示传感器的声音输出的误差麦克风信号，以及
处理电路，其用于从参考麦克风信号适应性地产生抗噪音信号以便抗噪音信号导致周围音频声音的基本消除，并且其中处理电路还监控抗噪音信号的位准，确定抗噪音信号会导致损坏传感器并且调整抗噪音信号的产生以便阻止损坏传感器，其中所述处理电路执行适应性滤波器，所述适应性滤波器具有塑形抗噪音信号的响应以减少周围音频声音在误差麦克风信号中的存在，并且其中所述处理电路，响应于确定所述抗噪音信号可能损坏所述传感器而进一步冻结适应性滤波器的调适，以使得所述适应性滤波器的响应保持恒定，同时所述处理电路调整所述抗噪音信号的产生以防止损坏传感器。
20.如权利要求19所述的集成电路，其中所述处理电路响应于确定抗噪音信号已经超过第一阈值而限制或压缩抗噪音信号。
21.如权利要求20所述的集成电路，其中所述处理电路响应于确定抗噪音信号具有已经超过第一阈值的低频率分量而第一限制或第一压缩抗噪音信号，以产生经处理的抗噪音信号，其中所述经处理的抗噪音信号被提供给所述传感器。
22.如权利要求21所述的集成电路，其中处理电路在提供所述经处理的抗噪音信号给所述传感器之前，响应于确定所述经处理的抗噪音信号的全带宽幅度已经超过第二阈值而第二限制或第二压缩所述经处理的抗噪音信号。
23.如权利要求22所述的集成电路，其中所述处理电路响应于确定所述抗噪音信号的低频率分量已经超过第一阈值而冻结适应性滤波器的调适。
24.如权利要求23所述的集成电路，其中如果所述经处理的抗噪音信号的全带宽已经超过第二阈值，那么处理电路也冻结适应性滤波器的调适。
25.如权利要求19所述的集成电路，其中处理电路响应于确定抗噪音信号具有已经超过第一阈值的低频率分量而第一限制或第一压缩抗噪音信号以产生经处理的抗噪音信号，并且通过确定第一限制或第一压缩信号的结果的全带宽已经超过第二阈值而第二限制或第二压缩所述经处理的抗噪音信号，并且其中如果所述抗噪音信号已经超过第一阈值或所述经处理的抗噪音信号已经超过第二阈值，那么处理电路冻结适应性滤波器的调适。
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JP2014521988A (ja) 2014-08-28
US20120308021A1 (en) 2012-12-06
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