CN103039090A - 带有监视功能的降噪电路 - Google Patents
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Abstract
这里公开了用于头戴式耳机(100)的降噪电路(200)。在所描述的实施例中,头戴式耳机(100)包括扬声器驱动器(110)并且电路(200)包括麦克风(112),麦克风(112)被配置用于将环境声音转换成相应的电环境信号并被部署为邻近扬声器驱动器的隔膜。电路(200)还包括:有源降噪路径,其被配置用于基于相应的电环境信号提供环境声音的有源降噪;以及声音信号补偿路径,其被配置用于恢复相应的电环境信号在音域内的衰减信号,以提高环境声音的声音信号的可听性。电路(200)还包括切换装置(204、210),被布置用于将相应的电环境信号选择性地传送到有源降噪路径或声音信号补偿路径。
Description
技术领域
本发明涉及带有监视功能的降噪电路,特别是但不限于头戴式耳机。
背景技术
带有无源降噪的头戴式耳机通常配备有完全包围耳朵(即,罩耳式)耳垫,并且耳垫提供对环境噪声的无源降低或隔离。降低的程度在很大程度上取决于环境噪声的性质以及头戴式耳机的耳垫的声学特性。由于耳垫的特性,大多数无源降噪头戴式耳机衰减环境噪声的较高频率分量(约从200Hz开始及更高),并且头戴式耳机用户仍然会听到较低频率分量。结果,这种无源头戴式耳机在某些嘈杂环境中不能提供充分或有效降噪。
为解决以上问题,已在头戴式耳机中提供了有源降噪电路,并且这种电路被配置用于消除或衰减环境噪声的较低频率分量以引起更加有效的噪声衰减。理想的是,检测到环境噪声波形,并且产生幅度相等但极性相反的相同抗噪波形。噪声波形和抗噪波形的互相作用引起噪声波形的消除。
本发明的目的在于提供带有监视功能的降噪电路,其提供了对类似的已知电路的有用备选。
发明内容
在本发明的第一个方面中,提供了一种用于头戴式耳机的带有监视功能的降噪电路,所述头戴式耳机具有至少一个扬声器驱动器,所述电路包括:
麦克风,被配置用于将环境声音转换成相应的电环境信号,所述麦克风被部署为邻近扬声器驱动器的隔膜;
有源降噪路径,其被配置用于基于相应的电环境信号提供环境声音的有源降噪;
声音信号补偿路径,其被配置用于恢复相应的电环境信号的在音域内的衰减信号,以提高环境声音的声音信号的可听性;以及
切换装置,被布置用于将相应的电环境信号选择性地传送到有源降噪路径或声音信号补偿路径。
优选地,声音信号补偿路径包括声音清晰度补偿器,该声音清晰度补偿器被配置用于增强在音域内的衰减信号的频率响应。声音清晰度补偿器可以包括带通滤波器和耦合到该带通滤波器的输出端的信号放大器。可选地,声音清晰度补偿器可以包括多于一个以并联方式级联的带通滤波器。进一步可选地,声音清晰度补偿器可以包括高通滤波器。
所述频率响应可取决于头戴式耳机的耳罩的构造和设计,所述频率响应在音域的200Hz和1KHz之间。
优选地,降噪电路还包括麦克风放大器,该麦克风放大器被布置用于放大相应的电环境信号,并且其中,切换装置被布置用于接收放大后的相应的电环境信号。
有利地,有源降噪路径包括有源去噪滤波器。麦克风可被布置为面对用户。此外或者作为替代,麦克风可被布置在扬声器驱动器的各膜的前面。
可想到,上述降噪电路可并入在头戴式耳机中,并且这形成本发明的第二个方面。
附图说明
下面将以示例的方式结合附图对本发明的实施例进行描述,其中:
图1是包括本发明的有源降噪电路的头戴式耳机100的示意图;
图2是示出图1的有源降噪电路的框图,其中包括声音清晰度补偿器;
图3示出图1的头戴式耳机100提供的普通无源隔离频率响应;
图4是图2的声音清晰度补偿器的示意图;
图5是示出图2的声音清晰度补偿器的效果的曲线图;并且
图6是图4的声音清晰度补偿器的变体的示意图。
具体实施方式
图1是示出头戴式耳机100的示意图,头戴式耳机100包括由头箍104连接的一对耳罩102a、102b。每个耳罩102a、102b包括罩耳式耳垫106a、106b,并且被布置成适合于围绕耳朵。每个耳罩102a、102b包括具有隔膜110的扬声器驱动器108(为避免图中的杂乱,图1中只示出一个)。头戴式耳机100还包括带有监视功能的有源降噪电路200(图1中未示出),有源降噪电路200包括麦克风112。麦克风112被部署为邻近隔膜110的前面,并被布置成面对用户的耳朵。麦克风112被安置成面对用户的耳朵以便检测用户耳朵可听到的环境噪声。从扬声器驱动器108发出的音频输出可通过有源去噪电路200利用相位反转来消除,有源去噪电路200在说明书的后续部分中更为详细地描述。
麦克风112被布置在扬声器驱动器的隔膜110前面并且十分靠近扬声器驱动器的隔膜110,并且被布置成面对耳朵以便更加准确地拾取耳朵将会拾取的不期望的环境噪声。在监视模式期间,麦克风112也用于拾取期望环境声音,例如语音或话音通信。下面对本发明优选实施例进行更详细的描述,使得通过使用麦克风112,准确地拾取不期望的环境噪声,并且仍然令人满意地补偿了期望环境声音。
图2是并入在头戴式耳机100的一个耳罩102b内的有源降噪电路200的框图。有源降噪电路200被容纳在耳罩102b的壳体内,并且包括麦克风预放大器202、第一切换装置204、抗噪消除ANC滤波器206、声音清晰度补偿器208、第二切换装置210、加法器212以及头戴式耳机放大器214。
如前所述,麦克风112被布置成接收不期望的和期望的声波。麦克风112将声波转换成电能,并将其作为反馈信号提供给麦克风预放大器202,麦克风预放大器202在将信号传送给第一切换装置204之前,提升反馈信号的增益。第一切换装置204包括开关204a和两个连接端204b、204c。当开关204a与第一连接端204b接触时,这产生有源降噪路径以便增强的反馈信号传送到ANC滤波器206。当开关204a与第二连接端204c接触时,这产生声音信号补偿路径,以便增强的反馈信号被引导至声音清晰度补偿器208。
ANC滤波器206被配置用于补偿无源耳垫106b在消除环境噪声低频分量方面的不足。就这一点而言,ANC滤波器206被布置成对提升后的反馈信号进行滤波和放大,以使得不期望的环境声音(即噪声)的低频分量传送到第二切换装置210。第二切换装置210可具有与第一切换装置204相同的配置,并且其包括开关210a和两个连接端210b、210c。当开关210a与第一连接端210b接触时,这将滤波后的反馈信号从ANC滤波器206传送到加法器212。
加法器212具有两个输入端212a、212b和一输出端212c,第一输入端212a被配置为正极性,而第二输入端21b被配置为负输入端。第一输入端212a连接到音频补偿器216,音频补偿器216又连接到音频源218,音频源218向耳罩102a、102b传送或者流传输音频信号,例如音乐或视频的声轨。由于在实现有源去噪的情况下,音频源218的一部分可能失真或丢失(对质量产生不利影响),因此音频补偿器216将音频输入恢复成其原来的波形,并提供此作为加法器212的第一输入端212a的音频输入。
第二输入端212b连接到第二切换装置210,并且由于其负极性,这将来自ANC滤波器206的滤波反馈信号的极性反转,以创建抗噪信号。加法器212的输出是包括音频输入和抗噪信号的组合信号,该组合输入然后被传送到头戴式耳机放大器214。头戴式耳机放大器214被布置成提升组合信号的增益以便由头戴式耳机驱动器108进行处理。收到组合信号后,头戴式耳机驱动器108将组合信号转换成音频输入和抗噪信号的声波。抗噪信号意图消除未被耳垫106a、106b衰减的、由耳朵拾取的低频噪声分量。这样,有源降噪或去噪得以实现。
头戴式耳机100的用户能够在需要时(例如在用户使用头戴式耳机100的时候与另一个人进行对话时)收听环境声音是有利的。这提高了头戴式耳机100的易用性和语音(对话)可听性。第一和第二切换装置204、210用作拨动开关,以使得头戴式耳机100的用户能够选择将反馈信号传送到环境声音被阻挡/降低的有源降噪路径,还是传送到加强环境声音(例如语音)以提高用户可听性的声音信号补偿路径。由于麦克风112的位置,这使得麦克风112很难拾取头戴式耳机100外部的期望环境声音。然而,这通过声音清晰度补偿器208得以解决。
声音清晰度补偿器208具有连接到第一切换装置204的第二连接端204c的输入端和连接到第二切换装置210的第二连接端210c的输出端。为了激活声音清晰度补偿器208,用户通过选择第一切换装置204的开关204a和第二切换装置210的开关210a分别与第二连接端204c和210c接触来激活监视模式。应当认识到,经过声音清晰度补偿器208的信号是异相的,因此,需要第二切换装置210使得经过音频补偿器216的信号和经过声音清晰度补偿器208的信号是同相的。
声音清晰度补偿器208的配置是基于对图1的有源降噪头戴式耳机100的无源隔离频率响应的研究的。在图3中示出普通的无源隔离频率响应。环境噪声的低于f0的低频分量不被耳罩102a、102b的无源隔离(由耳垫106a、106b提供)阻挡。环境噪声的高于f0的较高频率分量通过无源隔离而被极大地减少。在频率f1处,音频电平的降低可能是比f0处的音频电平低-20dB。正常对话期间的人类音域通常在90Hz到400Hz之间。基本语音频率及其更高次谐波展现出人的完整声音概况。因此,在没有声音清晰度补偿器208的情况下,在用户正在使用头戴式耳机100时发生正常对话并不是理想的。例如,如果无源隔离仅从200Hz开始衰减,显然,只有人类音域的一部分被听到,并且语音将是不清晰的。结果,声音清晰度补偿器208被配置用于针对由头戴式耳机100用户接收的在对话期间的可听语音,将f0和f1之间的环境噪声的衰减电平恢复到0dB(见图3的虚线)。
由于亥姆霍兹(Helmholtz)谐振,典型的反馈有源去噪头戴式耳机在频率f1处连续产生高音噪声。应注意的是,f0和f1的值取决于耳罩102a、102b的构造和设计。然而,很有可能f0和f1的值会落在90Hz到400Hz之间的人类音域内。因此,应当认识到,在声音清晰度补偿器208恢复声音信号的过程中,建议滤除f1及更高的频率。为了得到最佳性能,声音清晰度补偿器208在从f0到f1的区域内工作,以便恢复衰减的音频电平。这有效地扩宽了可听频率带宽,将音域基本频率以及其二次或三次谐波包括在内。结果,这保持了音域的完整性,并且用户能够享受稳定而清晰的对话。
声音清晰度补偿器208的示意图在图4中示出,并且其包括多重反馈(MFB)带通滤波器220和信号放大器222。MFB滤波器220包括具有负极性输入端226、接地的正极性输入端228和滤波器输出端230的运算放大器U100。负极性输入端226通过电容器C100、C102和电阻器R100、R101电耦合到补偿器输入端224。补偿器输入端224连接到第一切换装置204的第二连接端204c。MFB滤波器220包括反馈电阻器R102和反馈电容器C101,反馈电阻器R102和反馈电容器C101耦合在滤波器输出端230和负极性输入端226之间。
信号放大器222包括运算放大器U101,其被配置为反相放大器。运算放大器U101具有负极性输入端232、接地的正极性输入端234和电耦合到第二切换装置210的第二连接端210c的放大器输出端236。电阻器R104耦合在放大器输出端236和负极性输入端232之间,并且与电阻器R103一起为运算放大器U101提供增益。负极性输入端232通过直流阻挡电容器C103耦合到MFB带通滤波器220的滤波器输出端230。
MFB带通滤波器220被如此配置:基于头戴式耳机100的无源隔离概况,对于以所选频率为中心的中间频率,具有高增益和高品质因数。中间频率的中心在f0和f1之间,如图3所示,以避免亥姆霍兹谐振。表1列出了图4所示电路中使用的部件及其相应值,以便获得如下的滤波器增益、品质因数和中间频率:
滤波器增益,K=-16.7
品质因数,Q=8.1
中间频率,fm=915Hz
部件 | 值 |
R100 | 5.6KΩ |
R101 | 1.2KΩ |
R102 | 300KΩ |
R103 | 1.7KΩ |
R104 | 47KΩ |
C100 | 1.0μF |
C101 | 15nF |
C102 | 6.8nF |
C103 | 1.0μF |
表1:图4所示电路的部件值
应当认识到,表1中的各种部件的值仅仅是说明性的,不应视为任何形式或方式的限制。
当头戴式耳机100的用户想要选择监视模式时,用户相应地选择开关204a、210a,使得来自麦克风放大器202的提升后的反馈信号现在被传送到声音清晰度补偿器208,并且ANC滤波器206的ANC功能相应地被关闭。这就意味着麦克风112拾取的环境信号或声音被传送到声音清晰度补偿器208而非ANC滤波器206。如上面所说明的,声音清晰度补偿器208被配置用于恢复由无源隔离引起的衰减信号,特别是声音频带内的信号。
图5是示出声音清晰度补偿器208的效果的曲线图。该曲线图包括不经过声音清晰度补偿器208的第一语音信号的第一频率响应238(虚线),并且可以看到,环境信号从大约200Hz起开始被无源隔离(被耳罩106a、106b)衰减。该曲线图还包括经过声音清晰度补偿器208的第二语音信号的第二频率响应240。第一和第二语音信号都被麦克风112拾取,并且可以认识到,声音清晰度补偿器208能够在200Hz和1KHz频率之间提升或扩展第二语音信号的频率响应240,并且具体地,声音带宽在用节点A示出的大约700Hz标记处恢复到0dB。这样,声音清晰度补偿器208能够补偿无源隔离的衰减。
在使用时,当头戴式耳机100的用户正在收听从音源218向耳罩102a、102b流传输的音频时,第一切换装置204的开关204a和第二切换装置210的开关210a被选为连接到各自的第一连接端204b、210b。麦克风112拾取环境信号,由于高频分量被耳垫106a、106b提供的无源隔离所阻挡,因此这些环境信号将主要是低频分量。麦克风112然后将拾取的环境信号作为反馈信号传送到麦克风放大器202,再到ANC滤波器206,以使得产生反馈信号的反相信号来消除麦克风112拾取的环境信号。
当用户想要在不必摘除头戴式耳机100的情况下进行对话或收听环境声音时,用户选择第一切换装置204的开关204a和第二切换装置210的开关210a连接到各自的第二触头204c、210c,然后来自麦克风112的反馈信号被传送到声音清晰度补偿器208而非ANC滤波器206。声音清晰度补偿器208处理反馈信号(来自麦克风放大器202)以提升反馈信号的增益,使得用户能听到更为清晰的环境声音并因而具有更加稳定的对话。
作为对图4的配置的替代,如果使用级联的MFB带通滤波器,则可恢复更宽的声音带宽,并且图6示出了一个示例。参照图6进行详述,图4的两个MFB带通滤波器220'、220"并联级联,其输入端耦合到第一切换装置204的第二连接端204c。级联的MFB滤波器220'、220"的输出端耦合到信号放大器222',信号放大器222'与图4的信号放大器222具有相似配置,并且也用作求和器/加法器。与图4所示单个滤波器配置相比,级联的MFB滤波器220'、220"能够提供增强的语音清晰度。级联的MFB滤波器220'、220"和信号放大器222的各个部件的值是基于期望效果选择的,并且这将在本领域技术人员的知识范围内。具体地,每个带通滤波器220'、220"具有其自己的参数,以使得中间频率的中心在频带中的不同位置处。这样,电路设计能够补偿较宽带宽,并且恢复声音清晰度。此外,当MFB带通滤波器220'、220"以并联连接的方式级联时,每个滤波器补偿所选的中间频率,甚至可恢复更宽的带宽。
从所描述的实施例可以认识到,通过具有安装或放置在扬声器驱动器108附近的麦克风112以拾取环境声音(不期望的环境噪声和期望的环境声音,例如语音通信),这简化了有源去噪电路200的电路。取决于有源去噪电路200的模式,所拾取的环境声音被用来创建反相信号以有源地消除环境声音,或者被用来提升环境声音的某些分量的频率响应。换言之,麦克风112实际提供两种用途:拾取不期望的和期望的环境声音。
所描述的实施例不应理解为限制性的。例如,尽管优选地麦克风112面对用户的耳朵,但是麦克风112也可布置于其他位置来拾取环境声音,而不管声音是期望的环境声音(如语音)还是不期望的环境声音。
声音清晰度补偿器208被描述为带通滤波器,但是高通滤波器也是可能的。所描述的实施例提供了MFB滤波器的两个示例,但会想到,多个MFB滤波器可被级联,以提供增强的声音清晰度。如果使用高通滤波器,则这同样适用。
耳垫106a、106b被描述为罩耳式,但也可包括诸如耳内和耳上等其他类型。
现在充分描述了本发明,本领域普遍技术人员应当明白,在不脱离所要求保护的范围的情况下,可对本发明进行多种修改。
Claims (11)
1.一种带有监视功能的降噪电路,用于具有至少一个扬声器驱动器的头戴式耳机,所述电路包括:
麦克风,其被配置用于将环境声音转换成相应的电环境信号,所述麦克风被部署为邻近所述扬声器驱动器的隔膜;
有源降噪路径,其被配置用于基于所述相应的电环境信号提供所述环境声音的有源降噪;
声音信号补偿路径,其被配置用于恢复所述相应的电环境信号在音域内的衰减信号,以提高所述环境声音的声音信号的可听性;以及
切换装置,其被布置用于将所述相应的电环境信号选择性地传送到所述有源降噪路径或所述声音信号补偿路径。
2.根据权利要求1所述的降噪电路,其中所述声音信号补偿路径包括声音清晰度补偿器,该声音清晰度补偿器被配置用于增强所述在音域内的衰减信号的频率响应。
3.根据权利要求2所述的降噪电路,其中所述声音清晰度补偿器包括带通滤波器和耦合到所述带通滤波器的输出端的信号放大器。
4.根据权利要求2所述的降噪电路,其中所述声音清晰度补偿器包括多个以并联方式级联的带通滤波器。
5.根据权利要求2所述的降噪电路,其中所述声音清晰度补偿器包括高通滤波器。
6.根据权利要求2所述的降噪电路,其中所述频率响应取决于所述头戴式耳机的耳罩的构造和设计,所述频率响应在音域的200Hz和1KHz之间。
7.根据权利要求1所述的降噪电路,还包括麦克风放大器,该麦克风放大器被布置用于放大所述相应的电环境信号,并且其中所述切换装置被布置用于接收放大后的相应的电环境信号。
8.根据权利要求1所述的降噪电路,其中所述有源降噪路径包括有源去噪滤波器。
9.根据权利要求1所述的降噪电路,其中所述麦克风被布置为面对用户。
10.根据权利要求1所述的降噪电路,其中所述麦克风被布置在所述扬声器驱动器的隔膜的前面。
11.一种头戴式耳机,包括权利要求1所述的降噪电路。
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SG184998A1 (en) | 2012-11-29 |
US8553900B2 (en) | 2013-10-08 |
WO2011142722A1 (en) | 2011-11-17 |
CN103039090B (zh) | 2016-02-17 |
US20110280411A1 (en) | 2011-11-17 |
EP2569954A1 (en) | 2013-03-20 |
JP5788972B2 (ja) | 2015-10-07 |
EP2569954B1 (en) | 2017-11-15 |
JP2013526798A (ja) | 2013-06-24 |
EP2569954A4 (en) | 2015-11-25 |
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