CN110244833B - 麦克风组件 - Google Patents
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Abstract
本公开涉及麦克风组件。具体地,该麦克风包括微机电系统(MEMS)电路和集成电路。所述MEMS电路被构造成将语音信号转换为电信号,并且所述集成电路耦接到所述MEMS电路并被构造成接收该电信号。所述集成电路和所述MEMS电路从外部主机接收时钟信号。所述时钟信号用于使所述MEMS电路和所述集成电路第一时间段在全系统操作模式下操作并且在第二时间段在操作的语音活动模式下操作。所述语音活动模式具有第一功率消耗,所述全系统操作模式具有第二功率消耗。所述第一功率消耗小于所述第二功率消耗。所述集成电路被构造成在检测到语音活动时产生中断并且向主机发送所述中断。
Description
本申请是原案申请号为201480029545.3的发明专利申请(申请日:2014年5月20日,PCT申请号:PCT/US2014/038790,发明名称:麦克风、麦克风系统及操作麦克风的方法)的分案申请。
技术领域
本申请涉及麦克风,更具体地涉及使用这种麦克风的语音活动检测(VAD)方法。
背景技术
麦克风用于从扬声器获取语音信号。所述信号一旦被获得可以以多种不同的方式被处理。多种不同的功能可以被用于今天的麦克风中,并且他们可以交互并利用多种不同的算法。
语音触发,例如在移动系统中使用的,是客户所希望使用的逐渐流行的特征。例如,用户可能希望对移动装置说出命令并且使该装置对该命令进行反应。这些情况下,可编程数字信号处理器(DSP)将会首先使用语音活动检测算法检测是否有语音存在于麦克风所捕获的音频信号中,随后对该信号进行分析以预测接收到的音频信号中所说的文字是什么。不同的语音活动检测(VAD)方法已经被发展并在如便携式电话和个人计算机的不同类型的装置中采用。
在这些方案的使用中,功率消耗成为关注点。低功率消耗带来较长的待机时间。对今天的智能手机(尤其是)来说,电能的使用是关键因素。不幸的是,目前操作麦克风的方法使用并浪费了很多电能。这导致用户对这些先前方法和系统的不满。
发明内容
根据本公开的一方面,提供了一种麦克风,该麦克风包括:微机电系统(MEMS)换能器,所述MEMS换能器被构造成将语音信号转换为电信号,耦接到该MEMS换能器的集成电路,所述集成电路包括振荡器和语音活动检测器,所述集成电路被构造成当所述集成电路由所述振荡器进行时钟控制时在语音活动模式期间确定所述电信号中语音活动的存在;其中,所述麦克风被构造成响应于在所述麦克风的主机接口处提供中断信号经由所述主机接口从外部主机装置接收时钟信号,该时钟信号用于使所述麦克风在第一时间段期间在全系统操作模式下操作,所述麦克风被构造成在所述时钟信号缺失的情况下在第二时间段期间在所述语音活动模式下操作,该语音活动模式具有第一功率消耗并且该全系统操作模式具有第二功率消耗,该第一功率消耗小于该第二功率消耗,其中,所述集成电路被构造成在所述语音活动模式期间在检测到语音活动时产生所述中断信号。
根据本公开的另一方面,提供了一种麦克风系统,该麦克风系统包括:微机电系统MEMS换能器,其被构造成将语音信号转换为电信号,集成电路,该集成电路耦接到所述MEMS换能器,并被构造成接收所述电信号;其中,所述集成电路从外部主机装置接收时钟信号,该时钟信号用于使所述集成电路在第一时间段期间在全系统操作模式下操作并且在第二时间段期间在语音活动模式下操作,在所述语音活动模式中所述麦克风由所述麦克风的振荡器进行时钟控制,该语音活动模式具有第一功率消耗并且该全系统操作模式具有第二功率消耗,该第一功率消耗小于该第二功率消耗,其中,所述集成电路被构造成在检测到语音活动时产生中断,并且向所述麦克风的主机接口发送该中断。
根据本公开的又一方面,提供了一种用于操作麦克风的方法,该麦克风包括被构造成将语音信号转换为电信号的微机电系统MEMS换能器、和耦接到该MEMS换能器并被构造成接收该电信号的集成电路,该方法包括以下步骤:在所述集成电路处从外部主机装置接收时钟信号,该时钟信号用于使得麦克风在第一时间段期间在全系统操作模式下操作并且在第二时间段期间在操作的语音活动模式下操作,在所述语音活动模式中所述麦克风由所述麦克风的振荡器进行时钟控制,以第一功率消耗在所述语音活动模式下操作并且在以第二功率消耗在所述全系统操作模式下操作,该第一功率消耗小于该第二功率消耗;以及在检测到语音活动时由所述集成电路产生中断,并向所述麦克风的主机接口发送该中断。
附图说明
为了对公开内容的更完整理解,可以参照下面的具体描述和附图,其中:
图1包括具有使用VAD算法并包括节电特征的麦克风的系统框图;
图2包括使用了使用了VAD算法并包括节电特征的麦克风的系统的不同状态的图;
图3包括使用了VAD算法并包括节电特征的麦克风的框图;
图4包括专用集成电路(ASIC)的框图;
图5包括主机的框图;以及
图6包括示出了使用了VAD算法并包括节电特征的麦克风的操作的时序图。
本领域技术人员将会明白附图中的元素被简单和清楚的阐述。还会明白某个动作和/或步骤可能被按照特殊的发生顺序描述或描写,同时那些本领域技术人员将会明白这种关于顺序的特性没有被精确地要求。还可以明白的是,这里所使用的具有通常含义的术语和表述是分别与调查和学习领域相关的这类术语和表述,除了在这之前另有特殊含义被提出。
具体实施方式
现有的方法改变了现有移动系统被划分的方式,麦克风的功能、和其能运行的模式。为此,出现了具有语音或事件检测块的麦克风,这使得麦克风能产生中断信号来唤醒系统。
在某些方面,这里所描述的麦克风包括五个外部连接(或接触部)。第一连接可以是电源连接,并且第二连接可以是接地连接。第三连接、第四连接和第五连接是连接该麦克风与主机装置(例如,在安装有该麦克风的装置中的主机电路)。更具体地,第三连接可以是数据连接,第四连接可以是中断(由麦克风向主机发送),第五连接可以是时钟信号(由主机向麦克风发送)。
该麦克风可以具有多种操作模式并受时钟信号的控制。所述主机从麦克风接收数据信号和中断信号。该主机具有多个受由该麦克风产生的中断信号控制的电源模式。该主机产生用于麦克风的时钟信号,从而控制麦克风的操作模式。在一个示例中,时钟的缺失使得麦克风进入语音活动检测(VAD)模式。
在一个示例中,所述麦克风包括VAD操作模式。在这种操作模式中,麦克风具有很低的功率消耗,并且运行在相对低的时钟频率上,该时钟频率可以由外部(来自主机)提供或来自片上振荡器。
这种操作支持非常的低功率消耗水平,因为在这种模式中仅激活最必要的信号处理。在一方面,麦克风的模拟信号处理块(诸如,麦克风的前置放大器、模数转换器、电压调节器和为微机电系统(MEMS)麦克风提供偏压的电荷泵)以低功率运行。在这种模式中,这些块以降低的功率运行,该功率足以获得使VAD或事件检测器运行所需的带宽和信噪比(SNR)。例如,可以获得抽取(decimation)之后大约为8kHz的运行带宽和大约为60dB的SNR。
可以使用公知的技术实现上述VAD或事件检测器。例如,短期能量计与长期能量计、零交叉等等可以被用于检测语音信号。
还应该注意的是,接口(主机与麦克风之间的连接)不局限于这里所描述的精确的信号。为此,可以使用其他信号或信号的其他组合。该接口的实体实现方式可以变更。例如,可以是单个实体双向线或多个单向线。
在其他方面,麦克风还包括延迟缓冲器。在其它示例中,在唤醒时,缓冲数据通过第一传输线传输并且实时数据通过独立的第二输出线被同时传输。在进一步其他示例中,在模式切换时,缓冲数据被刷新或丢弃。
在进一步其他方面,麦克风被超频以使缓存数据赶上实时数据。麦克风还可以被用于多麦克风语音触发应用。在一个示例中,麦克风唤醒并且在缓冲或实时模式下使第二麦克风能够数据同步。
参照图1,描述了使用具有VAD算法并包括节能特征的麦克风102的系统100。该麦克风102可以在一个示例中是MEMS芯片(具有MEMS晶片(die),振动膜和电荷板)和专用集成电路(ASIC)。该系统还包括主机104。该主机104可以包括多种处理功能并可以是装有该麦克风102的装置(例如,个人计算机或便携电话、移动手持机或平板电脑)的一部分。
VDD电源信号112和接地信号114被耦接到麦克风102。中断信号108和数据信号110从麦克风102向主机104发送。时钟信号106从主机104向麦克风102发送。
在图1的系统100的操作的一个示例中,麦克风102具有多种操作模式,且这些操作模式由时钟信号106控制。主机104从麦克风102接收数据信号110以及中断信号108。主机104具有受控于中断信号108的多种电源模式,该中断信号108由麦克风102在检测到语音活动或某个语音事件(例如,所说的特定词汇)时产生。主机104产生用于麦克风102的时钟信号106从而控制麦克风102的操作模式。
在一个示例中,麦克风102包括VAD操作模式。在这种模式中,麦克风102具有非常低的功率消耗,并且运行在相对低的时钟频率上,该时钟频率可以由外部(从主机104提供的时钟信号106)提供或来自麦克风102中的内部片上振荡器。因此,当进行中断时,低电能操作可以被改变成高电能操作模式。可知,该中断允许系统在低电能操作模式和高电能操作模式下操作。
在某些方面,集成电路和MEMS电路从外部主机接收时钟信号。该时钟信号使得MEMS电路和集成电路能在第一时间段在全系统操作模式下操作并且第二时间段在操作的语音活动模式下操作。该语音活动模式具有第一功率消耗或水平,该全系统操作模式具有第二功率消耗或水平。该第一功率消耗小于该第二功率消耗。集成电路被构造成在检测到语音活动时产生中断并向主机发送该中断。时钟的缺失使得麦克风进入到语音活动检测模式。时钟电路可以与其他部件设置在同一芯片上或设置在外部。
在其他方面,本方案提供了在第三功率消耗或水平操作内部时钟并且之后产生外部数据流和时钟以向系统通知使其在第四功率消耗或水平操作。第三功率水平小于第四功率水平,并且第四功率水平小于第一功率水平。
在进一步其他方面,外部时钟可以被检测并可以在检测到语音活动之后施加。然后,内部时钟被同步到所述外部时钟。进而,VAD信号处理在同步后也被同步到外部时钟。
在又一些其它方面,当外部时钟被移除以降低整个系统的功率时,为了在第一或第二功率水平节能,所述系统还可以退回到内部时钟。
在另一个示例中,外部信号可以由时钟和声学活动检测的内部组合来产生,其作为信号和时钟的组合以向主机通知中断/唤醒并且识别语音信号。缓冲后的输入信号的带宽在一个示例中可以大约为8kHz。其他例子也是可能的。数据可以以PCM或PDM格式提供。格式的其他示例也是可能的。
现在参照图2,描述了使用了使用了VAD算法的麦克风的系统的不同操作状态。图2的方法具有三种操作模式:VAD模式202、(部分)唤醒主机模式204和全系统操作模式206。
在VAD模式202中,没有数据从麦克风中传出。主机在这种模式中是睡眠的。在一个方面,当主机睡眠时,仅对来自麦克风的所产生的中断信号必要反应的功能被使能。在这种模式下,主机低频运行以降低功率消耗,并且所有非必要的功能都被停止。这种模式具有可能的绝对低功率消耗,因为所有非必要块都被停止并且没有时钟或数据信号切换的发生。换句话说,模式202是低功率模式,其中VAD被使能并且不从主机接收外部时钟。
在(部分)唤醒主机模式204中,从主机接收外部时钟。数据被从麦克风中传出。由于检测到关键字和/或语音活动,主机被部分地唤醒。随后,用于麦克风的外部时钟被以对应于足以进行可靠的关键字检测的较高的性能水平的时钟频率使能。
全系统操作模式206是麦克风的高功率或标准操作模式。
在图2的状态转换图的操作的一个示例中,系统开始于模式202。VAD算法检测触发从VAD模式202转换到部分唤醒/唤醒模式204的事件。
在模式204中,主机检测关键字/讲话并判断关键字、短语或句子被识别。这种确定触发从模式204转换到全系统唤醒206。
在模式206中,主机关键字检测/讲话识别算法判断没有识别出关键字、短语或句子,其触发回到VAD模式202。这里,另一个模式或状态(未在图2中示出)确定系统应该进入部分唤醒/唤醒模式204或直接进入VAD模式202。
现在参见图3,描述了使用VAD算法并包括节能特征的麦克风300。所述麦克风300包括麦克风芯片或装置302。麦克风芯片302包括MEMS晶片、振动膜和电荷板。所述系统还包括ASIC 304。ASIC 304可以包括各种处理功能。MEMS芯片302从ASIC 304接收电荷泵信号315以MEMS芯片302供电。
VDD电源信号312和接地信号314被耦接到ASIC 304。中断信号308和数据信号310被ASIC 304发送到主机(例如,图1中的主机104)。被从主机发送的时钟信号306被ASIC 304接收。
在图3的麦克风300的操作的示例中,麦克风300有多种操作模式,并且这些操作模式受控于时钟信号306。语音信号被MEMS芯片302接收,并且这个声音被转换成电信号并通过数据引线311被发送到ASIC 304。ASIC 304将该电信号处理成数据信号,然后将该数据信号310从ASIC 304传输出去,并且产生中断信号308。主机(如,图1中的主机104)产生时钟信号306,并且该时钟信号306控制麦克风300的操作模式。
在一个示例中,麦克风300包括VAD操作模式。在这种模式下,麦克风300有非常低的功率消耗,并在可以由外部(来自由主机提供的时钟信号306)提供或来自麦克风300中的内部片上振荡器的相对低的时钟频率上运行。从而,当进行中断时,低功率操作可以被转换到较高功率操作。该中断允许系统被操作在低功率操作模式和高功率操作模式。
现在参照图4,描述了专用集成电路(ASIC)400的框图。ASIC 400包括电荷泵(CHP)402、放大器404、模数转换器406、语音活动检测器(VAD)408、控制块410(具有振荡器412)和开关414。
电荷泵CHP 402对MEMS元件(例如图3的MEMS芯片302)充电从而将电容的变化转化成电压。放大器404缓冲MEMS元件(例如图3的MEMS芯片302)的电信号并随后用增益A放大该信号。
A/D转换器406将来自放大器404的模拟信号转换为数字信号。如果语音被检测到,则VAD 408处理来自A/D转换器406的数字信号并产生中断信号411。该控制块410响应于外部时钟信号413(从主机接收)和来自VAD 408的中断信号411,控制ASIC 400的内部状态。该转换器414受控制块410的控制以允许数据415被发送到外部主机。
数据缓冲器可以被包括在A/D转换器406的输出端处。缓冲器可以缓冲表示音频信号的数据,并与VAD 408(例如,10ms-360ms以提及一个示例范围,其他范围也是可能的)的延迟对应或相近似。抽取滤波级可以被包括在A/D转换器的输出端处,从而减少缓冲器尺寸(取样器RAM)和功率,这将限制带宽。在此情况下,在缓冲器输出端处的插值级必须也被加上。在此情况下,延迟可以大约为200毫秒。在另一个示例中,延迟可以为大约360毫秒。延迟值的其他示例也是可能的。缓冲器被提供以允许任何识别算法具有对唤醒主机、收集足够的背景噪音统计并且识别环境噪音中的关键短语需要的延迟。
缓冲数据可以经由一些连接(诸如中断线411或数据线415)发送到主机。如果经由数据线415发送数据,那么可以在比采样时钟增大的时间频率上被发送。
另外,VAD 408的参数或设置可以被改变或控制。例如,可以改变或控制VAD 408的寄存器和存储器(可擦除和不可擦除两者)的写或读设置,例如,将背景噪音的不同电平考虑在内。
VAD 408的功能可以被增强或改变。例如,可以使用语音或短语检测。其他功能也可以被包括在内。
现在参照图5,描述了主机500的框图。主机500包括接口块502、数字信号处理(DSP)块504(包括关键字检测块506和字/语音识别块508)、控制块510(由片上振荡器511定时)和存储器512。
接口块502提供对麦克风(例如,图1的麦克风102)的接口功能。接口块向麦克风发送时钟信号520,并从麦克风接收中断信号522和数据信号524。DSP块使用关键字检测块506(检测关键字)和字/语音识别块508(检测字或语音)在两个步骤中处理数据信号。
控制块510控制麦克风(例如,图1的麦克风102)的电源状态、主机500的块和包括位于主机和麦克风(未在图5中示出)之外的其他块和功能的整个系统。
存储器512存储系统状态、数据和其他信息。片上振荡器511可从控制块510控制并使能对应于至少两个电源模式的至少两个时钟模式。
现在参照图6,描述了示出了麦克风的操作的时序图,该麦克风使用了VAD算法并且包括节能特征。图6的信号示出了系统并且尤其是麦克风如何对语音/事件信号作出反应并产生中断信号。继中断信号之后,该图示出了主机如何通过改变模式并且后续改变时钟信号的频率以改变麦克风的模式来对中断信号作出反应。
信号602示出了音频信号。在检测到音频信号时,麦克风产生如信号604所示的中断。如信号606所示,麦克风还产生数据。如可以从信号608中看到,主机响应于中断而将时钟信号(向麦克风发送)从低频率信号改变为高频率信号。另选地(如信号610所示),在低电能模式(事件之前)下,主机可以不发送时钟信号,并且可以仅在检测到事件时开始高频率时钟信号。
这里描述了本公开的优选实施方式,包括发明人已知的最好模式。可以理解的是,例示的实施方式仅为是示例性的,不应当认为是对所附权利要求范围的限制。
Claims (16)
1.一种麦克风组件,该麦克风组件包括:
声传感器,其被配置为响应于感测到声信号而在所述声传感器的输出端处产生电信号;
电路,其包括声活动检测器,所述电路具有耦接到所述声传感器的输出端的输入端,所述电路被配置为处理所述电信号,所述电路包括内部时钟信号生成器;
主机接口,其具有耦接到所述电路的外接触部,所述外接触部包括用于外部时钟信号和数据的接触部;
所述麦克风组件具有声活动检测操作模式,在该声活动检测操作模式期间,所述电路通过内部时钟信号进行时钟控制,所述电路被配置为在所述电路检测到声活动时向所述主机接口提供中断信号,
所述麦克风组件具有第一操作模式,在该第一操作模式期间,所述电路响应于提供中断信号而由在所述主机接口处接收到的外部时钟信号进行时钟控制,
其中,所述电路被配置为当在所述主机接口处接收到外部时钟信号时,向所述主机接口提供表示所述电信号的数据。
2.根据权利要求1所述的麦克风组件,其中,所述麦克风组件在由本地振荡器用所述内部时钟信号进行时钟控制时的功耗低于用外部时钟信号进行时钟控制时的功耗。
3.根据权利要求2所述的麦克风组件,其中,所述电路包括数据缓存器,所述电路被配置为在所述声活动检测操作模式期间把表示所述电信号的数据缓存在所述数据缓存器中,并且所述电路被配置为在把所述中断信号提供给所述主机接口之后向所述主机接口提供缓存数据。
4.根据权利要求3所述的麦克风组件,其中,所述电路包括模数转换器,该模数转换器具有耦接到所述声传感器的输出端的输入端,并且所述模数转换器包括耦接到所述声活动检测器和所述数据缓存器的输出端。
5.根据权利要求4所述的麦克风组件,其中,所述声传感器是电容式微机电系统换能器,并且所述电路是集成电路,该集成电路包括电荷泵,该电荷泵具有耦接到所述声传感器的偏压信号输出。
6.根据权利要求3所述的麦克风组件,其中,所述电路被配置为,当在所述主机接口处接收到外部时钟信号时向所述主机接口提供缓存数据。
7.根据权利要求6所述的麦克风组件,其中,所述电路被超频,以使提供给所述主机接口的缓存数据赶上实时情况。
8.根据权利要求3所述的麦克风组件,其中,在所述主机接口处没有外部时钟信号的情况下,所述电路由所述内部时钟信号生成器进行时钟控制,当在所述主机接口处接收到外部时钟信号时,所述电路由该外部时钟信号进行时钟控制。
9.一种麦克风组件,该麦克风组件包括:
声传感器;
电路,其具有耦接到所述声传感器的输出端的输入端,所述电路包括声活动检测器,所述电路包括内部时钟信号生成器;
主机接口,其具有耦接到所述电路的外接触部;
所述声活动检测器被配置为,当所述电路由来自所述内部时钟信号生成器的时钟信号来进行时钟控制时,在声活动检测模式下处理表示由所述声传感器输出的针对声活动的电信号的数据,
所述电路被配置为在检测到声活动之后向所述主机接口提供中断信号,并且所述电路被配置为响应于所述中断信号基于在所述主机接口处接收到的外部时钟信号来控制所述麦克风组件的操作模式,
其中,所述电路被配置为,当在所述主机接口处接收到外部时钟信号时向所述主机接口提供表示所述电信号的数据。
10.根据权利要求9所述的麦克风组件,所述电路包括数据缓存器,其中,所述电路被配置为,在声活动检测模式下的操作期间把表示所述电信号的数据缓存在所述数据缓存器中,并且所述电路被配置为在把所述中断信号提供给所述主机接口之后向所述主机接口提供缓存数据。
11.根据权利要求10所述的麦克风组件,所述电路被配置为,当在所述主机接口处接收到外部时钟信号时向所述主机接口提供缓存数据。
12.根据权利要求11所述的麦克风组件,其中,所述电路被超频,以使提供给所述主机接口的缓存数据赶上实时情况。
13.根据权利要求10所述的麦克风组件,其中,在所述主机接口处没有外部时钟信号的情况下,所述电路由内部时钟信号生成器进行时钟控制,并且当在所述主机接口处接收到外部时钟信号时,所述电路由该外部时钟信号进行时钟控制。
14.根据权利要求10所述的麦克风组件,所述声活动检测模式下的操作的功耗比所述麦克风组件的其他操作模式的功耗低。
15.根据权利要求10所述的麦克风组件,
所述电路包括模数转换器,该模数转换器具有耦接到所述声传感器的输出端的输入端,所述模数转换器包括耦接到所述声活动检测器和所述数据缓存器的输出端,以及
所述声传感器是微机电系统换能器,所述电路是集成电路。
16.一种麦克风组件,该麦克风组件包括:
微机电系统换能器;
电路,其包括声活动检测器、A/D转换器和数据缓存器,所述换能器的输出端耦接到所述A/D转换器的输入端,并且所述A/D转换器的输出端耦接到所述声活动检测器和所述数据缓存器;
内部时钟信号生成器;
主机接口,其具有耦接到所述电路的外接触部;
当在所述主机接口处没有外部时钟信号的情况下所述电路由内部时钟信号生成器进行时钟控制时,所述麦克风组件具有声活动检测模式,其中,在所述声活动检测模式期间,所述电路被配置为处理表示由所述换能器输出的针对声活动的电信号的数据,同时代表由所述换能器输出的电信号的数据被缓存在所述数据缓存器中,
所述电路被配置为,在检测到声事件之后向所述主机接口提供中断信号,并且所述电路被配置为响应于所述中断信号而基于在所述主机接口处接收到的外部时钟信号来控制所述麦克风组件的操作模式,所述麦克风组件具有多种不同的功耗模式,
其中,所述电路被配置为第二操作模式下向所述主机接口提供缓存数据,在该第二操作模式期间,在所述主机接口处接收到外部时钟信号。
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