公开(公告)号：WO2009136196A2

公开(公告)日：2009-11-12

申请号：PCT/GB2009/050473

申请日：2009-05-07

Applicant: WOLFSON MICROELECTRONICS PLC ,  McMULLEN, Robert Errol ,  LAMING, Richard Ian ,  TRAYNOR, Anthony Bernard ,  HOEKSTRA, Tsjerk Hans

Inventor： McMULLEN, Robert Errol ,  LAMING, Richard Ian ,  TRAYNOR, Anthony Bernard ,  HOEKSTRA, Tsjerk Hans

IPC: B81B7/04

CPC classification number: B06B1/0292

Abstract: A MEMS device comprises a substrate having at least a first transducer optimized for transmitting pressure waves, and at least a second transducer optimized for detecting pressure waves. The transducers can be optimised for transmitting or receiving by varying the diameter, thickness or mass of the membrane and/or electrode of each respective transducer. Various embodiments are described showing arrays of transducers, with different configurations of transmitting and receiving transducers. Embodiments are also disclosed having an array of transmitting transducers and an array of receiving transducers, wherein elements in the array of transmitting and /or receiving transducers are arranged to have different resonant frequencies. At least one of said first and second transducers may comprise an internal cavity that is sealed from the outside of the transducer.

Abstract translation: MEMS器件包括具有至少第一传感器的衬底，该第一传感器优化用于传送压力波，以及至少第二传感器，其优化用于检测压力波。 可以通过改变每个相应换能器的膜和/或电极的直径，厚度或质量来优化传感器的传播或接收。 描述了各种实施例，其示出了具有不同配置的发射和接收换能器的换能器阵列。 还公开了具有发射换能器阵列和接收换能器阵列的实施例，其中发射和/或接收换能器阵列中的元件布置成具有不同的谐振频率。 所述第一和第二换能器中的至少一个可以包括从换能器的外部密封的内部空腔。

公开(公告)号：WO2009081184A1

公开(公告)日：2009-07-02

申请号：PCT/GB2008/051176

申请日：2008-12-11

Applicant: WOLFSON MICROELECTRONICS PLC ,  MAGRATH, Anthony James

Inventor： MAGRATH, Anthony James

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3028

Abstract: There is provided a noise cancellation system, comprising: an input, for receiving a digital signal; a digital filter, having at least a high pass filter characteristic, for receiving the digital signal and generating a filter output signal; and an amplitude detector, for generating a detection signal based on an amplitude of a representation of said filter output signal, wherein the detection signal is applied to the digital filter to control a cut- off frequency thereof.

Abstract translation: 提供了一种噪声消除系统，包括：用于接收数字信号的输入; 具有至少高通滤波器特性的数字滤波器，用于接收数字信号并产生滤波器输出信号; 以及幅度检测器，用于基于所述滤波器输出信号的表示的幅度产生检测信号，其中所述检测信号被施加到所述数字滤波器以控制其截止频率。

公开(公告)号：WO2009013451A1

公开(公告)日：2009-01-29

申请号：PCT/GB2008/002169

申请日：2008-06-25

Applicant: WOLFSON MICROELECTRONICS PLC ,  McLEOD, Gordon, Richard

Inventor： McLEOD, Gordon, Richard

IPC: G06F3/16

CPC classification number: G06F3/162

Abstract: An audio codec (100) is provided with a control sequencer (110) interposed between control interface logic (120) and control registers (130) of the codec. A memory (114, 116) associated with the control sequencer (110) enables a burst of operations to be preloaded into the audio codec. In response to a single command from an external control processor (20), the sequencer (110) can then execute the burst with precise delays between each operation and without further direction from the processor. This frees the processor (20) to concentrate on other tasks within the system, and/or to enter a low-power mode to conserve energy. The system may be a personal media player.

Abstract translation: 音频编解码器（100）设置有插入在编解码器的控制接口逻辑（120）和控制寄存器（130）之间的控制定序器（110）。 与控制定序器（110）相关联的存储器（114,116）使得能够将突发的操作预加载到音频编解码器中。 响应于来自外部控制处理器（20）的单个命令，定序器（110）然后可以在每个操作之间具有精确的延迟并且没有来自处理器的进一步的方向来执行突发。 这使得处理器（20）能够集中于系统内的其他任务，和/或进入低功耗模式以节省能量。 该系统可以是个人媒体播放器。

公开(公告)号：WO2008090342A3

公开(公告)日：2008-10-30

申请号：PCT/GB2008000237

申请日：2008-01-23

Applicant: WOLFSON MICROELECTRONICS PLC ,  SIBBALD ALASTAIR ,  HOWLE MARTIN

Inventor： SIBBALD ALASTAIR ,  HOWLE MARTIN

IPC: H04R3/00 ,  G10K11/178

CPC classification number: H04R3/00 ,  G10K11/178 ,  G10K2210/1081 ,  H04R1/1083

Abstract: The invention provides improved ambient noise reduction for ear-worn devices, such as earphones and headphones and for other devices worn upon or used in close proximity to the ear, such as cellular telephone handsets, and it provides, in particular, improvements to "feed-forward" ambient noise-reduction systems. Most feed-forward noise-reduction systems available hitherto purport to operate only below about 1 kHz and, even then, provide only relatively modest amounts of noise reduction. In accordance with this invention, predetermined filter parameters, such as the gain and cut-off frequency of a selected filter stage used in the noise-reduction processing, are mathematically modelled and the model is adjusted in real-time, in response to user-interpretation of a graphical display of a predicted residual noise amplitude spectrum. This allows the user to inspect the predicted residual noise level amplitude spectrum and to iteratively adjust the filter parameters to minimise residual noise in a chosen environment. Instead of being made manually by a user, the iterative adjustments may be automated and implemented under computer control, using known data-fitting methods and/or neural networks.

Abstract translation: 本发明为诸如耳机和头戴式耳机之类的耳戴式设备以及佩戴在耳朵上或靠近耳朵使用的其他设备（诸如蜂窝式电话手持设备）提供了改善的环境噪声降低，并且特别地提供了对“馈送 前向“环境降噪系统。 迄今为止，大多数可用的前馈降噪系统只能在约1kHz以下工作，即使这样，也只能提供相对适中的降噪量。 根据本发明，响应于用户定义的参数，在数学上建模预定的滤波器参数（例如在降噪处理中使用的选定滤波器级的增益和截止频率）并且实时调节模型， 解释预测的残余噪声振幅谱的图形显示。 这允许用户检查预测的残余噪声电平幅度谱并且迭代地调整滤波器参数以最小化所选环境中的残余噪声。 使用已知的数据拟合方法和/或神经网络，代替由用户手动进行，迭代调整可以被自动化并且在计算机控制下实现。

公开(公告)号：WO2007107736A2

公开(公告)日：2007-09-27

申请号：PCT/GB2007/000972

申请日：2007-03-20

Applicant: WOLFSON MICROELECTRONICS PLC ,  LAMING, Richard Ian ,  BEGBIE, Mark ,  TRAYNOR, Anthony

Inventor： LAMING, Richard Ian ,  BEGBIE, Mark ,  TRAYNOR, Anthony

IPC: B81C1/00

CPC classification number: B81C1/00158 ,  B81B2201/0257 ,  B81B2203/0127 ,  B81C99/004 ,  B81C2201/0109 ,  H04R7/10 ,  H04R7/18 ,  H04R19/005 ,  H04R2307/207 ,  Y10S977/733

Abstract: A MEMS device, for example a capacitive microphone, comprises a flexible membrane 11 that is free to move in response to pressure differences generated by sound waves. A first electrode 13 is mechanically coupled to the flexible membrane 11 , and together form a first capacitive plate of the capacitive microphone device. A second electrode 23 is mechanically coupled to a generally rigid structural layer or back-plate 14, which together form a second capacitive plate of the capacitive microphone device. The capacitive microphone is formed on a substrate 1 , for example a silicon wafer. A back- volume 33 is provided below the membrane 11 , and is formed using a "back-etch" through the substrate 1. A first cavity 9 is located directly below the membrane 11 , and is formed using a first sacrificial layer during the fabrication process. Interposed between the first and second electrodes 13 and 23 is a second cavity 17, which is formed using a second sacrificial layer during the fabrication process. A plurality of bleed holes 15 connect the first cavity 9 and the second cavity 17. Acoustic holes 31 are arranged in the back-plate 14 so as to allow free movement of air molecules, such that the sound waves can enter the second cavity 17. The first and second cavities 9 and 17 in association with the back-volume 33 allow the membrane 11 to move in response to the sound waves entering via the acoustic holes 31 in the back-plate 14. The provision of first and second sacrifjciaj layers has the advantage of protecting the membrane during manufacture, and disassociating the back etch process from the definition of the membrane. The bleed holes 15 aid with the removal of the first and second sacrificial layers. The bleed holes 15 also contribute to the operating characteristics of the microphone.

Abstract translation: MEMS器件，例如电容麦克风，包括响应于由声波产生的压力差而自由移动的柔性膜11。 第一电极13机械耦合到柔性膜11，并且一起形成电容式麦克风装置的第一电容板。 第二电极23机械地耦合到大致刚性的结构层或背板14，它们一起形成电容式麦克风装置的第二电容板。 电容麦克风形成在基板1上，例如硅晶片。 背部体积33设置在膜11的下方，并且通过基底1的“背蚀刻”形成。第一腔9位于膜11的正下方，并且在制造期间使用第一牺牲层形成 处理。 介于第一和第二电极13和23之间的是第二腔17，其在制造过程中使用第二牺牲层形成。 多个排放孔15连接第一腔9和第二腔17.声孔31布置在背板14中，以便允许空气分子的自由运动，使得声波可以进入第二腔17。 与背部体积33相关联的第一和第二腔9和17允许膜11响应于通过背板14中的声孔31进入的声波而移动。提供第一和第二牺牲层具有 在制造过程中保护膜的优点，以及使背蚀刻工艺与膜的定义分离。 排出孔15有助于去除第一和第二牺牲层。 排放孔15也有助于麦克风的操作特性。

公开(公告)号：WO2015001325A1

公开(公告)日：2015-01-08

申请号：PCT/GB2014/051985

申请日：2014-06-30

Applicant: WOLFSON MICROELECTRONICS PLC

Inventor： JENKINS, Colin Robert ,  HOEKSTRA, Tsjerk ,  CARGILL, Scott

IPC: H04R19/00 ,  B81B3/00 ,  H04R7/10

CPC classification number: B81B3/0072 ,  B81B7/0061 ,  B81B2201/0257 ,  B81B2201/0264 ,  B81B2203/0127 ,  B81B2203/04 ,  H04R7/10 ,  H04R19/005 ,  H04R19/04 ,  H04R2201/003

Abstract: The application describes improvements to (MEMS) transducers (100) having a flexible membrane (301) with a membrane electrode (302), especially where the membrane is crystalline or polycrystalline and the membrane electrode is metal or a metal alloy. Such transducers may typically include a back-plate having at least one back-plate layer (304) coupled to a back-plate electrode (303), with a plurality of holes (314) in the back-plate electrode corresponding to a plurality back-plate holes (312) through the back-plate. In embodiments of the invention the membrane electrode has at least one opening (313) in the membrane electrode wherein, at least part of the area of the opening corresponds to the area of at least one back-plate hole, in a direction normal to the membrane, and there is no hole in the flexible membrane at said opening in the membrane electrode. There may be a plurality of such openings. The openings effectively allow a reduction in the amount of membrane electrode material, e.g. metal, that may undergo plastic deformation and permanently deform the membrane. The openings are at least partly aligned with the back-plate holes to minimise any loss of capacitance.

Abstract translation: 该应用描述了具有具有膜电极（302）的柔性膜（301）的（MEMS）换能器（100）的改进，特别是在膜是结晶或多晶的情况下，膜电极是金属或金属合金。 这样的换能器通常可以包括背板，其具有耦合到背板电极（303）的至少一个背板层（304），背板电极中的多个孔（314）对应于多个背面 通过背板的板孔（312）。 在本发明的实施例中，膜电极在膜电极中具有至少一个开口（313），其中至少一部分开口区域对应于至少一个背板孔的面积，沿垂直于 膜，并且在膜电极的所述开口处的柔性膜中没有孔。 可以有多个这样的开口。 这些开口有效地允许膜电极材料的量的减少，例如， 金属，可能会发生塑性变形并使膜永久变形。 这些开口至少部分地与背板孔对准，以最小化电容的任何损失。

公开(公告)号：WO2014102530A1

公开(公告)日：2014-07-03

申请号：PCT/GB2013/053295

申请日：2013-12-13

Applicant: WOLFSON MICROELECTRONICS PLC

Inventor： MACKAY, Graeme ,  BOTHWELL, Andrew

IPC: H04R5/04 ,  G06F11/30 ,  H04M1/725

CPC classification number: H04R1/1091 ,  G06F11/3041 ,  G06F11/3051 ,  G06F11/3096 ,  H04M1/72527 ,  H04R1/1083 ,  H04R3/00 ,  H04R5/04 ,  H04R29/00 ,  H04R2201/107 ,  H04R2420/03 ,  H04R2420/05 ,  H04R2420/09

Abstract: Circuitry detects properties of an accessory removably connected thereto via a multi- pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. In the circuitry, first current sourcing circuitry is coupled to said first circuit terminal for providing a first current. A switch network comprises first, second, third and fourth switch network terminals, said first switch network terminal coupled to a reference potential, said second switch network terminal coupled to said second circuit terminal, and said third switch network terminal coupled to said third circuit terminal. Comparator circuitry provides a comparison signal, its first input terminal being coupled to said first circuit terminal. Second current sourcing circuitry having a monitor node coupled to said second comparator input terminal and an output node coupled to said fourth switch network terminal provides a second current to said switch network. At least one of said first current sourcing circuitry and said second current-sourcing circuitry is responsive to a digital control word for varying said first or said second current. Control logic is provided for operatively controlling the state of the interconnections of said switch network, for adjusting said digital control word in response to said comparison signal until a voltage at said first circuit terminal is equal to a voltage at said monitor node, and for supplying said adjusted digital control word associated with the state of the interconnections to said output as an evaluation value.

Abstract translation: 电路检测通过多极连接器可移除地连接到其上的附件的特性。 电路具有用于耦合到所述连接器的相应第一，第二和第三极的第一，第二和第三电路端子，并且具有用于提供评估值的输出，从该值可以导出附件的属性。 在电路中，第一电流源电路耦合到所述第一电路端子，用于提供第一电流。 交换网络包括第一，第二，第三和第四交换机网络终端，所述第一交换网络终端耦合到参考电位，所述第二交换网络终端耦合到所述第二电路终端，所述第三交换网络终端耦合到所述第三电路终端 。 比较器电路提供比较信号，其第一输入端耦合到所述第一电路端。 具有耦合到所述第二比较器输入端子的监视器节点和耦合到所述第四交换机网络终端的输出节点的第二电流源电路向所述交换网络提供第二电流。 所述第一电流源电路和所述第二电流源电路中的至少一个响应数字控制字来改变所述第一或所述第二电流。 提供控制逻辑用于可操作地控制所述开关网络的互连状态，用于响应于所述比较信号调整所述数字控制字，直到所述第一电路端子处的电压等于所述监视器节点处的电压，并且用于提供 所述调整后的数字控制字与作为评估值的与所述输出的互连的状态相关联。

公开(公告)号：WO2013076470A3

公开(公告)日：2013-07-25

申请号：PCT/GB2012052868

申请日：2012-11-20

Applicant: WOLFSON MICROELECTRONICS PLC

Inventor： LESSO JOHN PAUL

IPC: H03L7/099 ,  H03L7/23

CPC classification number: H03L7/0994 ,  H03L7/235

Abstract: A clock generator receives a first input clock signal and a second input clock signal. A first frequency comparator generates a first frequency comparison signal based on a ratio of a frequency of the output clock signal to a frequency of the first input clock signal, and a first subtractor forms a first error signal representing a difference between an input desired frequency ratio and the first frequency comparison signal. A first digital filter receives the first error signal and forms a filtered first error signal. A second frequency comparator generates a second frequency comparison signal based on a ratio of a frequency of the output clock signal to a frequency of the second input clock signal, and a second subtractor forms a second error signal representing a difference between the filtered first error signal and the second frequency comparison signal. A second digital filter receives the second error signal and forms a filtered second error signal. A numerically controlled oscillator receives the filtered second error signal and generates an output clock signal. As a result, the output clock signal has the jitter characteristics of the first input clock signal over a useful range of jitter frequencies and the frequency accuracy of the second input clock signal.

Abstract translation: 时钟发生器接收第一输入时钟信号和第二输入时钟信号。 第一频率比较器基于输出时钟信号的频率与第一输入时钟信号的频率的比率产生第一频率比较信号，第一减法器形成第一误差信号，其表示输入的期望频率比 和第一频率比较信号。 第一数字滤波器接收第一误差信号并形成滤波后的第一误差信号。 第二频率比较器基于输出时钟信号的频率与第二输入时钟信号的频率的比率产生第二频率比较信号，第二减法器形成表示滤波后的第一误差信号之间的差的第二误差信号 和第二频率比较信号。 第二数字滤波器接收第二误差信号并形成滤波后的第二误差信号。 数字振荡器接收经滤波的第二误差信号并产生输出时钟信号。 结果，输出时钟信号在抖动频率的有用范围和第二输入时钟信号的频率精度上具有第一输入时钟信号的抖动特性。

公开(公告)号：WO2013088174A1

公开(公告)日：2013-06-20

申请号：PCT/GB2012/053152

申请日：2012-12-14

Applicant: WOLFSON MICROELECTRONICS PLC

Inventor： LESSO, John Paul ,  FRITH, Peter John ,  PENNOCK, John Laurence

IPC: H04L25/49

CPC classification number: H04L25/4902 ,  H04L25/4904

Abstract: This application relates to methods and apparatus for transfer of multiple digital data streams, especially of digital audio data over a single communications link such as a single wire. The application describes audio interface circuitry comprising a pulse-length-modulator, PLM (103). The PLM is responsive to a plurality of data streams (PDM-R, PDM-L) of audio data samples at a sample rate, to generate a stream of data pulses (MPDM) at the sample rate. The length of each said data pulse is dependent upon on a combination of the then current audio data samples from the plurality of data streams. Circuitry for receiving and extracting the data is also disclosed. An interface (104) receives the stream of data pulses (MPDM) and data extraction circuitry (105, 106) determines the pulse length of said data pulse and determines a data value for each of the plurality of audio data streams.

Abstract translation: 本申请涉及用于通过单个通信链路（例如单线）传送多个数字数据流，特别是数字音频数据的方法和装置。 该应用描述了包括脉冲长度调制器PLM（103）的音频接口电路。 PLM以采样率对音频数据样本的多个数据流（PDM-R，PDM-L）进行响应，以采样率产生数据脉冲流（MPDM）。 每个所述数据脉冲的长度取决于来自多个数据流的当前当前音频数据样本的组合。 还公开了用于接收和提取数据的电路。 接口（104）接收数据脉冲流（MPDM），并且数据提取电路（105,106）确定所述数据脉冲的脉冲长度，并确定多个音频数据流中的每一个的数据值。

公开(公告)号：WO2013001316A1

公开(公告)日：2013-01-03

申请号：PCT/GB2012/051536

申请日：2012-06-29

Applicant: WOLFSON MICROELECTRONICS PLC ,  MARCHANT, Andrew ,  BRYAN-MERRETT, John

Inventor： MARCHANT, Andrew ,  BRYAN-MERRETT, John

IPC: H04R29/00

CPC classification number: H04R29/004

Abstract: An acoustic test apparatus, comprises an input, for receiving electrical signals; a first acoustically sealable enclosure; a second acoustically sealable enclosure; an acoustically sealable test volume, located between the first and second acoustically sealed enclosures; a first electroacoustic transducer, mounted between the first acoustically sealable enclosure and the acoustically sealable test volume; and a second electroacoustic transducer, mounted between the first acoustically sealable enclosure and the acoustically sealable test volume. The input is connected to the first and second electroacoustic transducers such that an electrical signal from the input causes each of the first and second electroacoustic transducers to generate variations in sound pressure in the test volume, and wherein said variations in sound pressure generated by the first and second electroacoustic transducers are in phase with each other.

Abstract translation: 声学测试装置，包括用于接收电信号的输入; 第一个可声学密封的外壳; 第二个声学可密封的外壳; 声学上可密封的测试体积，位于第一和第二声学密封的外壳之间; 第一电声换能器，安装在第一声可密封外壳和可声学密封的测试体积之间; 以及第二电声换能器，安装在第一可声学封闭的外壳和声学可密封的测试体积之间。 输入连接到第一和第二电声换能器，使得来自输入的电信号使得第一和第二电声换能器中的每一个产生测试体积中的声压变化，并且其中由第一和第二电声换能器产生的声压变化 并且第二电声换能器彼此同相。