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公开(公告)号：US09786264B2
公开(公告)日：2017-10-10
申请号：US13919743
申请日：2013-06-17
Applicant: Wolfson Microelectronics plc
Inventor： Alastair Sibbald
IPC: A61F11/06 , G10K11/178 , H04R1/10
CPC classification number: G10K11/178 , G10K11/17857 , H04R1/1083
Abstract: A feedforward ambient noise reduction arrangement includes, within a housing, a loudspeaker device for directing sound energy into an ear of a listener. Disposed externally of the housing, and positioned to sense ambient noise on its way to the listener's ear, are plural microphone devices capable of converting the sensed ambient noise into electrical signals for application to the loudspeaker to generate an acoustic signal opposing the ambient noise. Importantly, the overall arrangement is such that the acoustic signal is generated by said loudspeaker means in substantial time alignment with the arrival of said ambient noise at the listener's ear.
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公开(公告)号：US09716476B2
公开(公告)日：2017-07-25
申请号：US14142276
申请日：2013-12-27
Applicant: Wolfson Microelectronics plc
Inventor： John Paul Lesso
CPC classification number: H03F3/181 , H03F1/304 , H03F3/183 , H03F2200/03 , H03K3/013
Abstract: An apparatus and method for DC offset compensation. An amplifier receives an input signal (AIN) and provides an amplified output signal (SOUT) and a feedback path provides DC offset compensation. The feedback path comprises at least one voltage controlled oscillator (VCO) and a counter. The VCO provides, over time, a first VCO output signal based on said amplified output signal and a second VCO output signal based on a reference signal (VREF). The counter generates first pulse counts based upon the first VCO output signal and second pulse counts based upon the second VCO output signal and provides a compensation signal based on a comparison of the first and second pulse counts. One voltage controlled oscillator may sequentially receive a signal based on said amplifier output signal and the reference signal from a multiplexer so as to sequentially produce the first and second VCO output signals.
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13.发明授权Apparatus and method for testing a capacitive transducer and/or associated electronic circuitry 有权用于测试电容式换能器和/或相关电子电路的装置和方法公开(公告)号：US09575116B2
公开(公告)日：2017-02-21
申请号：US14156723
申请日：2014-01-16
Applicant: Wolfson Microelectronics plc
Inventor： Colin Findlay Steele , John L. Pennock
CPC classification number: G01R31/2829 , B81B7/008 , B81C99/004 , G01R31/2884 , H01L2224/05554 , H01L2224/48091 , H01L2224/48137 , H04R19/005 , H04R29/004 , H04R2201/003 , H01L2924/00014
Abstract: A method of testing a capacitive transducer circuit, for example a MEMS capacitive transducer, by applying a test signal via one or more capacitors provided in the transducer circuit.
Abstract translation: 通过经由设置在换能器电路中的一个或多个电容器施加测试信号来测试电容式换能器电路，例如MEMS电容换能器的方法。
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公开(公告)号：US20150263686A1
公开(公告)日：2015-09-17
申请号：US14436648
申请日：2013-10-10
Applicant: WOLFSON MICROELECTRONICS PLC
Inventor： John Paul Lesso
CPC classification number: H03G3/001 , H03M1/0624 , H03M1/0626 , H03M1/0863 , H03M1/66 , H03M1/70
Abstract: The application relates to digital to analogue conversion circuits having dynamic gain control. A digital variable gain element (102) may apply gain to an input digital signal (DIN) upstream of a DAC (101) to make better use of the input range of the DAC and an analogue variable gain element (103) applies a compensating analogue gain. Again controller (201) has a gain allocation module (204) for controlling the allocation of gain between said digital and analogue variable gain elements in response to changes in a signal level of the input digital audio signal. In the present invention the gain allocation module is operable in first and second modes of operation where the response to reductions in signal level is slower in the first mode than in the second mode of operation. A low-level detector (202) monitors the input digital audio signal so as to detect a low-level part of the signal and the gain controller changes from the first mode to the second mode following detection of a low-level part of the input digital audio signal. The response of the gain allocation module in the second mode is preferably fast enough such that the digital gain can be changed to a target setting suitable for the low-level part of the signal before it is received at the digital gain element.
Abstract translation: 该应用涉及具有动态增益控制的数模转换电路。 数字可变增益元件（102）可以对DAC（101）上游的输入数字信号（DIN）施加增益，以更好地利用DAC的输入范围，并且模拟可变增益元件（103）应用补偿模拟 获得。 再次，控制器（201）具有增益分配模块（204），用于响应于输入数字音频信号的信号电平的变化来控制所述数字和模拟可变增益元件之间的增益分配。 在本发明中，增益分配模块可在第一和第二操作模式中操作，其中对第一模式的信号电平降低的响应比在第二操作模式中更慢。 低电平检测器（202）监视输入数字音频信号，以便在检测到输入的低电平部分之后检测信号的低电平部分，并且增益控制器从第一模式改变到第二模式 数字音频信号。 增益分配模块在第二模式中的响应优选地足够快，使得数字增益可以在其在数字增益元件被接收之前被改变为适合于信号的低电平部分的目标设置。
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公开(公告)号：US20150256924A1
公开(公告)日：2015-09-10
申请号：US14430466
申请日：2013-09-19
Applicant: WOLFSON MICROELECTRONICS PLC
Inventor： Tsjerk Hoekstra , Mark Hesketh
CPC classification number: H04R19/005 , B81B3/0021 , B81B2201/0257 , H04R1/222 , H04R1/2892 , H04R7/20 , H04R19/04 , H04R31/003 , H04R2201/003 , H04R2207/021
Abstract: This application relates to MEMS devices, especially MEMS capacitive transducers and to processes for forming such MEMS transducer that provide increased robustness and resilience to acoustic shock. The application describes a MEMS transducer having a flexible membrane (101) supported relative to a first surface of a substrate (105) which has one or more cavities therein, e.g. to provide an acoustic volume. A stop structure (401, 402) is positioned so as to be contactable by the membrane when deflected so as to limit the amount of deflection of the membrane. The stop structure defines one or more openings to the one or more substrate cavities and comprises at least one narrow support element (401, 402) within or between said one or more openings. The stop structure thus limits the amount of membrane deflection, thus reducing the stress experienced at the edges and prevents the membrane from contacting a sharp edge of a substrate cavity. As the stop structure comprises narrow support elements any performance impact on the transducer is limited.
Abstract translation: 本申请涉及MEMS器件，特别是MEMS电容式换能器，以及用于形成这样的MEMS换能器的方法，其提供对声学冲击的增强的鲁棒性和弹性。 该应用描述了一种MEMS传感器，其具有相对于其中具有一个或多个空腔的衬底（105）的第一表面支撑的柔性膜（101）。 以提供声音体积。 定位结构（401,402）被定位成当偏转时能够被膜接触，以限制膜的偏转量。 止挡结构限定了一个或多个开口到一个或多个基底空腔，并且包括在所述一个或多个开口之内或之间的至少一个窄支撑元件（401,402）。 因此，止挡结构限制了膜偏转的量，从而减小了边缘处的应力，并且防止了膜接触衬底腔的尖锐边缘。 由于止动结构包括窄支撑元件，所以对换能器的任何性能影响都受到限制。
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Patent Agency Ranking
公开(公告)号：US08843227B2
公开(公告)日：2014-09-23
申请号：US13869726
申请日：2013-04-24
Applicant: Wolfson Microelectronics plc
Inventor： David Sinai
CPC classification number: G10L19/008 , G06F3/162 , H03M1/12 , H03M1/66 , H04B7/2653 , H04B7/2659 , H04L5/14 , H04M1/0202
Abstract: A wireless cellular telephone with an audio codec for converting digital audio signals to analog audio signals. The audio codec comprises two digital audio bus interfaces for coupling to respective digital audio buses, and a digital-only signal path between the two digital audio bus interfaces, such that no analog processing of the audio signals occurs in the digital-only signal path.
Abstract translation: 一种具有将数字音频信号转换为模拟音频信号的音频编解码器的无线蜂窝电话。 音频编解码器包括用于耦合到相应数字音频总线的两个数字音频总线接口和两个数字音频总线接口之间的仅数字信号路径，使得在仅数字信号路径中不发生音频信号的模拟处理。
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公开(公告)号：US20140153733A1
公开(公告)日：2014-06-05
申请号：US14024436
申请日：2013-09-11
Applicant: Wolfson Microelectronics plc
Inventor： Steven Llewellyn
CPC classification number: G10K11/16 , G10K11/178 , G10K2210/1081 , G10K2210/3045 , G10K2210/3214 , H04R1/10 , H04R1/1033 , H04R1/1083
Abstract: An earphone has a housing, with a speaker mounted within the housing. A cable inlet contains a cable that includes a wire connected to the speaker. The cable and the cable inlet have different cross-sectional shapes, such that the cable is in contact with the inner surface of the cable inlet over a substantial portion of their length, while a rear volume of the speaker is vented through the cable inlet. This ensures that the cross-sectional area through which the rear volume is vented through the cable inlet remains relatively constant. The earphone may further comprise a microphone, positioned to detect ambient noise approaching the ear of a wearer of the earphone, and the cable may then further include a wire connected to the microphone.
Abstract translation: 耳机具有外壳，扬声器安装在外壳内。 电缆入口包含一根电缆，其中包括连接到扬声器的电线。 电缆和电缆入口具有不同的横截面形状，使得电缆在其长度的大部分上与电缆入口的内表面接触，而扬声器的后部体积通过电缆入口排出。 这确保后部体积通过电缆入口排出的横截面积保持相对恒定。 耳机还可以包括麦克风，定位成检测接近耳机佩戴者的耳朵的环境噪声，并且电缆然后可以进一步包括连接到麦克风的导线。
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公开(公告)号：US20140152388A1
公开(公告)日：2014-06-05
申请号：US14174553
申请日：2014-02-06
Applicant: WOLFSON MICROELECTRONICS PLC
Inventor： John P. Lesso , John L. Pennock , Peter J. Frith
CPC classification number: H02M3/07 , H03F1/025 , H03F3/185 , H03F3/187 , H03F3/68 , H03F2200/507 , H03F2200/511 , H03G1/0017 , H03G1/0029 , H03G1/0088 , H03G1/0094
Abstract: A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.
Abstract translation: 一种信号放大电路及相关的方法和装置，所述电路包括：从输入端延伸到输出端的信号路径;增益控制器，被配置为响应于控制信号控制沿着信号路径施加的增益; 用于产生输出信号的信号路径内的输出级，输出级具有基本上与其电源电压无关的增益;以及可变电压电源，包括用于提供正和负输出电压的电荷泵，所述电荷泵包括 可操作于多个不同状态的开关网络和用于以一系列状态操作开关的控制器，以便将跨越大致等于输入电压的电压产生正和负输出电压。
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公开(公告)号：US08698256B2
公开(公告)日：2014-04-15
申请号：US13902344
申请日：2013-05-24
Applicant: Wolfson Microelectronics plc
Inventor： Anthony Bernard Traynor , Richard Ian Laming , Tsjerk Hans Hoekstra
IPC: H01L29/84
CPC classification number: H04R19/04 , B81B3/0021 , B81B3/0072 , B81B3/0094 , B81B2201/00 , B81B2201/0235 , B81B2201/0257 , B81B2201/0264 , H01L27/00 , H04R19/00 , H04R19/005 , H04R23/00 , H04R31/00 , H04R2499/11
Abstract: A method of fabricating a micro-electrical-mechanical system (MEMS) transducer comprises the steps of forming a membrane on a substrate, and forming a back-volume in the substrate. The step of forming a back-volume in the substrate comprises the steps of forming a first back-volume portion and a second back-volume portion, the first back-volume portion being separated from the second back-volume portion by a step in a sidewall of the back-volume. The cross-sectional area of the second back-volume portion can be made greater than the cross-sectional area of the membrane, thereby enabling the back-volume to be increased without being constrained by the cross-sectional area of the membrane. The back-volume may comprise a third back-volume portion. The third back-volume portion enables the effective diameter of the membrane to be formed more accurately.
Abstract translation: 制造微机电系统（MEMS）换能器的方法包括以下步骤：在衬底上形成膜，并在衬底中形成后体积。 在基板中形成后部体积的步骤包括以下步骤：形成第一后部体积部分和第二后部体积部分，第一后部体积部分与第二背部体积部分分离， 背部体积的侧壁。 第二后部容积部分的横截面面积可以大于膜的横截面面积，从而能够增加后部体积，而不受膜的横截面面积的约束。 背部容积可以包括第三后部体积部分。 第三后部体积部分能够更准确地形成膜的有效直径。
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公开(公告)号：US20140016798A1
公开(公告)日：2014-01-16
申请号：US13937067
申请日：2013-07-08
Applicant: Wolfson Microelectronics plc
Inventor： Richard Ian Laming , Anthony Traynor
CPC classification number: B81C1/00158 , B81B3/0027 , B81B2201/0257 , B81C1/00246 , B81C1/00904 , B81C2201/056 , G01L9/0073 , H04R3/005 , H04R19/005 , H04R19/04
Abstract: A method of fabricating a micro-electrical-mechanical system (MEMS) apparatus on a substrate comprises the steps of processing the substrate so as to fabricate an electronic circuit; depositing a first electrode that is operably coupled with the electronic circuit; depositing a membrane so that it is mechanically coupled to the first electrode; applying a sacrificial layer; depositing a structural layer and a second electrode that is operably coupled with the electronic circuit so that the sacrificial layer is disposed between the membrane and the structural layer so as to form a preliminary structure; singulating the substrate; and removing the sacrificial layer so as to form a MEMS structure, in which the step of singulating the substrate is carried out before the step of removing the sacrificial layer.
Abstract translation: 在基板上制造微电子机械系统（MEMS）装置的方法包括以下步骤：处理基板以制造电子电路; 沉积与电子电路可操作耦合的第一电极; 沉积膜，使得其机械耦合到第一电极; 施加牺牲层; 沉积与电子电路可操作地耦合的结构层和第二电极，使得牺牲层设置在膜和结构层之间，以便形成初步结构; 单片基片; 以及去除所述牺牲层以形成MEMS结构，其中在去除所述牺牲层的步骤之前执行所述衬底的单分离步骤。
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