CN101658049A - 风噪声抑制装置 - Google Patents
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Abstract
一种用于减小风噪声的设备,由电声转换器装置组成,所述电声转换器装置具有至少一个转换器元件。为外露的结构覆盖至少一个耐风材料薄层,所述耐风材料薄层是网状物形式的,并且可选地包括由毡、泡沫、和/或网状物以任何组合形式组成的一个或更多个其他层。在提供多个元件的情况下,可以将这些元件的电输出加在一起,以提供具有更高的信号对风噪声比的输出信号。可以对该信号进行附加的信号处理,如滤波和/或位电平感信号抑制。
Description
技术领域
本发明涉及电声转换器的使用,更具体地,涉及在麦克风情况下减少风噪声影响的装置。
背景技术
与麦克风有关的风噪声问题是熟知的,已经提出了许多解决方案。这样的提议通常需要使用复杂的信号处理设备,这相当大地提高了麦克风及关联系统的成本。还提出了较简单的解决方案,如为麦克风提供某种挡风板,这可以是行之有效的,但是却太占空间。
发明内容
本发明提供了一种装置,包括覆盖有用于预先减弱风的耐风材料层的至少一个转换器元件。所述耐风材料包括单独的网状物或与一个或更多个薄泡沫和/或毡层相组合的网状物,并且可以可选地包括附加的网状物层。优选地,耐风材料的外表面是特殊地被定形的,且由无缝地接合的多个凸面组成。发明人已发现,在将外表面定形为形成立体双曲线形状时,可以达到最佳效果。该转换器元件或每个转换器元件位于由定形后的耐风材料所限定的、以便完全的外露于风中的容积内。
该技术同样适用于全向麦克风,并且效果较差地适用于双向及单向麦克风。
实际上,优选的装置使用最少三个麦克风,尽管所描述的耐风材料网状物在与一个或两个麦克风一起使用时也提供了有利的风噪声减小的效果。
本发明的优点是无需存在所需的声源即可使本发明运作。
附图说明
为了使本发明更容易地被理解,将参考附图以示例的方式来描述本发明的实施例,附图中:
图1图示意性地示出了根据本发明的麦克风装置的第一实施例;
图2图示意性地示出了本发明的第二实施例;以及
图3示出了根据本发明的、包含修改后电路的另一装置的方块图。此改进的目的是检测产生最大风噪声的麦克风,并防止其输出达到累加电路。
具体实施方式
本发明的实施例包括一个或更多个转换器元件。在提供了多于一个的转换器元件的情况下,通过将转换器元件的输出累加以产生单个输出,可以实现进一步的风噪声减小效果。优选的是,使用全向转换器元件,然而也可以使用单向或双向元件,但是性能水平较低。全向转换器元件是以下这样元件:在该元件中,在外壳中存在单个端口,其中在外壳内布置膜片,使得所述膜片对来自不同方向的声音作出等同的响应。彼此之间相对的元件的布置不是重要的,因为可以通过将输出累加来实现进一步的风噪声减小效果,而与元件相对于声源所面向的方向无关,尽管在元件面向不同方向时实现了最佳的性能。然而,可能存在以下情况:在该情况下,将元件相对于彼此地布置,使得这些元件的端口与所需的声源距离相等。在一个这样的装置中,元件可以位于虚球表面,使得这些元件都与期望的声源距离相等。
此外,应当利用薄的耐风材料为麦克风挡风,所述耐风材料可以包围这些麦克风或至少被置于所有麦克风元件所共有的所有外露的孔上。该材料可以由具有大小为大约125微米或更小的孔洞的网状物组成,所述网状物可以与薄毡或泡沫相组合。泡沫可以类似于用来覆盖头戴耳机的耳机的材料,尽管其它装置也是有效的。优选地,该材料不应对这些元件的频率响应造成显著的不利影响。
现在参考图1,图1示出了一种装置,包括多个全向转换器元件,这多个全向转换器元件覆盖有网状物形式的耐风材料层10,所述网状物具有大约小于125微米(优选地小于大约75微米,更优选地40-50微米)的孔。网状物例如可以由线制成。应注意,具有单个转换器单元的装置中可以使用相同类型的耐风材料。如果需要,该网状物可以与由薄毡或吸声泡沫(与用来覆盖头戴耳机的耳机的材料相类似)组成的层相组合。可以采用多种不同方式来将定形后的网状物与毡或泡沫层相组合,而不是简单地如图2所示利用网状物覆盖毡或泡沫。举例而言,毡或泡沫可以覆盖网状物,或可以存在由网状物和毡或泡沫以任何组合形式组成的交替的层,以在以增大体积为代价的情况下实现更好的风噪声抑制。因而,材料10并不影响元件的频率响应。
在本实施例中,提供了多个转换器元件,这些元件的输出通过缓冲电路16来馈送并由累加电路17加在一起。在累加之后,在被馈送至输出缓冲器19之前,由高通或带通滤波电路对这些信号进行滤波。应注意的是,元件的端口应面向不同的方向。在提供单个转换器元件的情况下,可以对单个元件的输出信号(而不是对上述累加后的输出)应用相同的滤波技术。
在图1的实施例中,存在三个全向麦克风,并且这三个全向麦克风是相对于彼此而布置的,以使得这三个麦克风物理上定向于三维空间内。这些元件为如上述的材料10所覆盖。图1中的B和D元件物理上布置于相同的平面内,但是元件B和D的端口通常指向含有声源的区域。换句话说,这两个元件的端口在同一平面内但是指向不同角度。中间的元件C物理上在含有元件B和D的平面的上方,但它是倾斜的。因此,元件C同样指向含有声源的区域。
现在转向图2,图2示出了一种麦克风装置,其中在遮风屏内布置四个麦克风,该遮风屏是由如上所述包围薄毡或泡沫层12的类型的细网状物10的外层形成的,尽管可以与具有任何数目麦克风的装置一起使用相同的遮风屏。麦克风A、B、C及D被定向于三维空间内面向由点20表示的公共点,可以认为该点是纸平面内或纸平面外的空间中的任何点。
如在图1装置的情况下,以传统的方式对麦克风的输出进行缓冲并累加在一起,其中使用任何合适的模拟或数字技术进行相等的加权或增益。在累加之后,输出可以经过截止频率是大约200赫兹的高通或带通滤波器,以便进一步改进风噪声抑制。将滤波器输出馈送至驱动器和放大器电路。如果需要的话,或者在仅具有单个麦克风的装置中,在没有任何附加处理的情况下,也可以在相加过程之前执行滤波。
应注意的是,在麦克风不指向声源的情况下,也可以实现风抑制效应;麦克风指向不同方向就可以了。通过定向每个麦克风使得该麦克风的端口根据应用指向声源,可以实现进一步减小风噪声。
全向元件可以位于具有耐风材料层或由耐风材料层形成的外壳内。备选地,所述元件可以位于具有一个或更多个孔的箱中,在这种情况下仅需要为孔覆盖耐风材料,尽管此装置不是理想的。此外,这种材料可以是如上所描述的,从而这种材料不会加重本发明的实际可制造性的负担。包括网状物与毡或泡沫的组合在内的声障板的形状对风噪声抑制性能有影响,其中最佳性能是以多个凸形部分实现的。优选地,凸形部分构成三维(通常是双曲线)形状。具体地,已经发现利用定形后的部分之间的收缩部分形成屏幕能有效地扰乱风。
一个预期用法是,以某种方式安装麦克风元件,使得阵列相对于期望的声源处于相对固定的位置。在麦克风供一现场演说使用情况下,该麦克风可以附着在悬臂的末端,所述悬臂本身是耳机或头戴式耳机的一部分。在另一实例中,麦克风可被装在头罩上,该头罩可以具有产生内部有害风噪声源的氧气馈送口,或可以用于替换已有外部广播装置中的已有麦克风,其中麦克风位于笼内,该笼被布置为保持对著用户脸部,而麦克风本身与用户口部相隔限定的距离。助听器经历风噪声干扰,并且可以得益于本发明。应用包含但不限于与移动电话一起使用的有线或蓝芽PHF(个人免持)设备。麦克风可以与相机一起使用以使得所需的声音大致来自相机前方,或实质上可以用于捕获来自任何方向的声音。说话者可是不动的或在不对所需的风噪声抑制性能造成影响的情况下移动。
应强调的是,图1及图2所描述的麦克风元件将加强任何声音,而不论所需的声源是否位于一个霍格鞥多个元件的端口前方。因此,不需要相对于比方说口部精确地定位麦克风,已发现,如图1和图2所描述的麦克风元件的阵列将令人满意地工作,即使将该阵列非有利地定向在合适的声源附近并从而仅接收离轴信号。
图3示出了具有电子电路的麦克风阵列的框图,所述电子电路用于执行信号处理,如果这是任何具体应用所需要的,例如,如果一个或更多个元件制造出不适当的信号则最好将其从累加的输出中排除。有许多方法可以使用模拟或数字解决方案来实现这种功能。尽管未在此图中被显示,然而这些麦克风元件由前述公共的耐风材料薄层10所覆盖。将元件的输出馈送至可控缓冲器,可控缓冲器将这些信号与参考电压相比较,以抑制来自被影响最严重的元件的信号。尔后,在由滤波器电路18处理之后,将信号加在一起并馈送至输出缓冲器19,其中该滤波器电路18以大约200赫兹的截止频率应用高通或带通滤波。可以提供其它陷波和带通滤波器,以补偿语音保真度的任何轻微损失。可以对来自单个元件的输出应用类似的滤波技术,在这种情况下不需要累加。
麦克风元件阵列替换传统麦克风,因此通过在制造期间并入于设备中可用作该麦克风的直接替换。这是可以通过以下方式来实现的:在制造期间,并入麦克风元件及关联的信号加法电路作为更大设备的组件。备选地,麦克风元件可以与其关联的信号加法电路一起封装,或不与其关联的信号加法电路一起封装,并作为模块提供给制造商。
一个或更多个优选地全向转换器元件的阵列,不论是否为模块形式,均可被安装于外壳内,该外壳可为耐水的或防溅的,但是为该外壳提供被耐风材料层所覆盖的孔洞。可以为该外壳提供用于将该元件阵列附着到用户的另一件设备上的构件,例如利用弹簧夹。本发明可以具有广泛的应用,如,作为较大件设备的组件部分,或作为较大设备的模块。为了给出不同应用的一些指示,现在将描述多个实施例。这并不是穷举的清单。
一种实施方案是,如前面指示的替换外部广播麦克风。另一实施方案是,替换移动电话或移动电话的PHF器材的一部分中的麦克风。另一实施方案是,替换便携式记录设备内的麦克风。
另外的实施方案是,替换相机或摄影机、摄影手机、或其它便携式通信设备内的麦克风。这可以被指向用户的麦克风,以使得该用户可以对正在拍摄或录制的场景作出评论。尽管上述装置都是参考风和麦克风而公开的,然而同样的原则可以应用于诸如水之类的其它流体,在这种情况下转换器通常称作水听器。
此外,可以使用允许元件阵列占据非常小空间的半导体技术来制造全向转换器元件。MEM麦克风有时称作SiMIC(硅麦克风)。以适当阵列的形式使用一个或更多个微型全向转换器元件使得本发明的方案可以应用在助听器中,所述助听器适用于微风或大风条件下(例如,户外)的用户。尽管图中示出了针对耐风材料的简单形状,然而研究已显示,针对该耐风材料使用特殊形状是有利的。如图2所示,所述一个或更多个麦克风元件位于细网状物的相对刚性的机壳内,其中所述细网状物从平面看具有多个凸形部分。
Claims (22)
1.一种电声转换器装置,包括至少一个转换器元件、以及覆盖所述转换器元件的耐风材料,其中,所述耐风材料是网状物形式的,所述网状物具有尺寸上小于大约125微米的孔并且被定形为形成封闭容积,所述封闭容积可以外露于风中并且被布置为包含该转换器元件或每个转换器元件。
2.根据权利要求1所述的转换器装置,其中,所述网状物具有40-50微米的孔。
3.根据权利要求2所述的转换器装置,其中,所述该转换器元件或每个转换器元件是全向元件。
4.根据权利要求1、2或3所述的转换器装置,其中,所述耐风材料包括毡或泡沫材料层。
5.根据权利要求1至4中任一项所述的转换器装置,其中,所述耐风材料被定形为形成多个凸面部分。
6.根据权利要求1至5中任一项所述的转换器装置,其中,所述耐风材料被定形为形成总体上三维双曲线形状。
7.根据权利要求5或6所述的转换器装置,其中,所述耐风材料的外表面是以收缩部分形成的。
8.根据权利要求1至7中任一项所述的转换器装置,其中,存在多个转换器元件,以及对所述元件的输出进行累加,其中每个转换器元件面向唯一的方向。
9.根据权利要求1至8中任一项所述的转换器装置,其中,所述该转换器元件或每个转换器元件是麦克风元件,并且位于附着到用户头部的悬臂上以被定位成指向用户口部。
10.根据权利要求1至8中任一项所述的转换器装置,其中,所述该转换器元件或每个转换器元件是麦克风元件,并且位于头罩上以指向用户口部。
11.根据权利要求1至10中任一项所述的转换器装置,其中,有多个元件是使用半导体微型制造技术而制造的。
12.根据权利要求1至8中任一项所述的转换器装置,其中,对所述该元件或每个元件的输出进行滤波以减小噪声。
13.根据权利要求12所述的转换器装置,其中,所述滤波使用高通或带通滤波器。
14.根据权利要求12或13所述的转换器装置,其中,所述滤波器使大约200赫兹以上的频率通过。
15.一种转换器模块,包括外壳,在所述外壳内提供如前述或后续任一权利要求所述的转换器装置,其中,所述外壳的外表面在一个方向上是半透性的,并且是防溅的或防水的。
16.根据权利要求15所述的模块,其中,在所述防溅的或防水的外壳内邻近每个麦克风提供孔洞阵列。
17.根据权利要求15或16所述的模块,其中,以超模制封装体形式提供安装构件。
18.一种相机,包含根据前述权利要求中任一项所述的转换器装置或模块。
19.一种便携式通信设备,包含根据权利要求1至17中任一项所述的转换器装置或模块。
20.根据权利要求19所述的便携式通信设备,其中,所述设备传递数据以及声音。
21.一种助听器,包含根据权利要求1至17中任一项所述的转换器装置或模块。
22.一种记录设备,包含根据权利要求1至17中任一项所述的转换器装置或模块。
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GB0703059A GB2446619A (en) | 2007-02-16 | 2007-02-16 | Reduction of wind noise in an omnidirectional microphone array |
GB0703059.6 | 2007-02-16 | ||
GB0704682A GB2446620A (en) | 2007-02-16 | 2007-03-09 | A microphone wind shield or wind screen |
GB0704682.4 | 2007-03-09 | ||
PCT/GB2008/000545 WO2008099199A1 (en) | 2007-02-16 | 2008-02-18 | Wind noise rejection apparatus |
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EP (2) | EP2138006A1 (zh) |
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CN (2) | CN101658048A (zh) |
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-
2008
- 2008-02-15 TW TW099115862A patent/TW201038084A/zh unknown
- 2008-02-15 TW TW097105466A patent/TW200904221A/zh unknown
- 2008-02-18 EP EP08709433A patent/EP2138006A1/en not_active Withdrawn
- 2008-02-18 US US12/527,195 patent/US20100166215A1/en not_active Abandoned
- 2008-02-18 CN CN200880005054A patent/CN101658048A/zh active Pending
- 2008-02-18 CN CN200880005095A patent/CN101658049A/zh active Pending
- 2008-02-18 EP EP08709437A patent/EP2127465A1/en not_active Withdrawn
- 2008-02-18 JP JP2009549474A patent/JP2010519800A/ja active Pending
- 2008-02-18 JP JP2009549475A patent/JP2010519801A/ja active Pending
- 2008-02-18 KR KR1020097019316A patent/KR20090110946A/ko not_active Application Discontinuation
- 2008-02-18 KR KR1020097019321A patent/KR20090110947A/ko not_active Application Discontinuation
- 2008-02-18 US US12/527,197 patent/US20100128901A1/en not_active Abandoned
- 2008-02-18 WO PCT/GB2008/000549 patent/WO2008099200A1/en active Application Filing
- 2008-02-18 WO PCT/GB2008/000545 patent/WO2008099199A1/en active Application Filing
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WO2008099200A1 (en) | 2008-08-21 |
US20100128901A1 (en) | 2010-05-27 |
JP2010519800A (ja) | 2010-06-03 |
GB2446619A (en) | 2008-08-20 |
TW201038084A (en) | 2010-10-16 |
GB0703059D0 (en) | 2007-03-28 |
GB2446620A (en) | 2008-08-20 |
GB0704682D0 (en) | 2007-04-18 |
EP2127465A1 (en) | 2009-12-02 |
JP2010519801A (ja) | 2010-06-03 |
KR20090110947A (ko) | 2009-10-23 |
WO2008099199A1 (en) | 2008-08-21 |
EP2138006A1 (en) | 2009-12-30 |
US20100166215A1 (en) | 2010-07-01 |
KR20090110946A (ko) | 2009-10-23 |
TW200904221A (en) | 2009-01-16 |
CN101658048A (zh) | 2010-02-24 |
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Application publication date: 20100224 |