公开(公告)号：WO2009024762A3

公开(公告)日：2009-07-16

申请号：PCT/GB2008002772

申请日：2008-08-15

Applicant: WOLFSON MICROELECTRONICS PLC ,  TRAYNOR ANTHONY BERNARD ,  LAMING RICHARD IAN ,  HOEKSTRA TSJERK HANS

Inventor： TRAYNOR ANTHONY BERNARD ,  LAMING RICHARD IAN ,  HOEKSTRA TSJERK HANS

IPC: B81B3/00

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 (5) on a substrate (3), 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 (7a) and a second back-volume portion (7b), the first back-volume portion (7a) being separated from the second back-volume portion (7b) by a step in a sidewall of the back-volume. The cross-sectional area of the second back-volume portion (7b) can be made greater than the cross-sectional area of the membrane (5), thereby enabling the back-volume to be increased without being constrained by the cross-sectional area of the membrane (5). 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: 一种制造微机电系统（MEMS）换能器的方法包括以下步骤：在衬底（3）上形成膜（5）;以及在衬底中形成回流体积。 在衬底中形成后体积的步骤包括形成第一后体积部分（7a）和第二后体积部分（7b）的步骤，第一后体积部分（7a）与第二后体积部分 后体积部分（7b）通过后体积的侧壁中的台阶。 第二后体积部分（7b）的横截面积可以大于膜（5）的横截面积，由此使得后体积能够增加而不受横截面积的限制 的膜（5）。 后部空间可以包括第三后部空间部分。 第三后部容积部分能够更精确地形成膜的有效直径。

公开(公告)号：WO2009083713A1

公开(公告)日：2009-07-09

申请号：PCT/GB2008/004269

申请日：2008-12-23

Applicant: WOLFSON MICROELECTRONICS PLC ,  LESSO, John, Paul

Inventor： LESSO, John, Paul

IPC: H03L7/16

CPC classification number: H03L7/18 ,  G06F1/08 ,  H03L7/093 ,  H03L7/0995 ,  H03L7/16

Abstract: A frequency synthesiser comprises an oscillator, for example a numerically controller oscillator, for generating a first signal having a first frequency. An edge combiner is provided for generating a second signal derived from the first signal, for example using two or more tap signals from the oscillator, the second signal having a frequency that is greater than the first signal. A detector receives an input reference signal and a feedback signal, and generates an output signal that is used to provide an input to the oscillator, such that the oscillator operates in a locked loop mode of operation. The feedback signal to the detector is taken from the output of the edge combiner rather than directly from the output of the oscillator. This has the advantage of enabling the edge combiner to be designed more robustly. The frequency synthesiser may include a sigma-delta modulator which is clocked by either the first signal or the second signal depending on power requirements.

Abstract translation: 频率合成器包括用于产生具有第一频率的第一信号的振荡器，例如数字控制器振荡器。 边缘组合器被提供用于产生从第一信号导出的第二信号，例如使用来自振荡器的两个或更多抽头信号，第二信号具有大于第一信号的频率。 检测器接收输入参考信号和反馈信号，并且产生用于向振荡器提供输入的输出信号，使得振荡器以锁定环路操作模式工作。 来自检测器的反馈信号取自边缘组合器的输出，而不是直接从振荡器的输出。 这具有使得边缘组合器更加鲁棒地被设计的优点。 频率合成器可以包括根据功率要求由第一信号或第二信号计时的Σ-Δ调制器。

公开(公告)号：WO2009081193A1

公开(公告)日：2009-07-02

申请号：PCT/GB2008/051189

申请日：2008-12-15

Applicant: WOLFSON MICROELECTRONICS PLC ,  AL-NAIMI, Khaldoon ,  MAGRATH, Anthony James ,  SIBBALD, Alastair

Inventor： AL-NAIMI, Khaldoon ,  MAGRATH, Anthony James ,  SIBBALD, Alastair

IPC: G10K11/178

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

Abstract: There is provided a noise cancellation system, comprising an input for a digital signal, the digital signal having a first sample rate; a digital filter, including a fixed filter and an adaptive filter; and control circuitry, for generating at least one control signal based on the input digital signal, wherein said at least one control signal is applied to the adaptive filter to control a filter characteristic thereof.

Abstract translation: 提供了一种噪声消除系统，包括用于数字信号的输入，该数字信号具有第一采样率; 数字滤波器，包括固定滤波器和自适应滤波器; 以及用于基于所述输入数字信号产生至少一个控制信号的控制电路，其中所述至少一个控制信号被施加到所述自适应滤波器以控制其滤波器特性。

公开(公告)号：WO2009081192A1

公开(公告)日：2009-07-02

申请号：PCT/GB2008/051188

申请日：2008-12-15

Applicant: WOLFSON MICROELECTRONICS PLC ,  AL-NAIMI, Khaldoon ,  ALCOCK, Robert, David

Inventor： AL-NAIMI, Khaldoon ,  ALCOCK, Robert, David

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3051

Abstract: There is provided a noise cancellation system, comprising: an adaptive filter, for receiving a digital noise signal at a first sample rate and generating a noise cancellation signal; and control circuitry, for generating a control signal having a second sample rate for application to the adaptive filter to adjust a filter characteristic thereof. The second sample rate is lower than the first sample rate but is higher than a Nyquist sampling rate required to sample signals up to a desired cut-off frequency within the audio frequency range.

Abstract translation: 提供了一种噪声消除系统，包括：自适应滤波器，用于以第一采样率接收数字噪声信号并产生噪声消除信号; 以及控制电路，用于产生具有第二采样率的控制信号以供应用于自适应滤波器以调整其滤波器特性。 第二采样率低于第一采样率，但是高于在音频范围内将信号采样到所需截止频率所需的奈奎斯特采样率。

公开(公告)号：WO2009081187A1

公开(公告)日：2009-07-02

申请号：PCT/GB2008/051182

申请日：2008-12-12

Applicant: WOLFSON MICROELECTRONICS PLC ,  MAGRATH, Anthony, James ,  CLEMOW, Richard

Inventor： MAGRATH, Anthony, James ,  CLEMOW, Richard

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3051 ,  H04R3/002

Abstract: There is provided a noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and a processor. The processor comprises: an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and a control circuit, for generating a control signal on the basis of the emulated filter output. The control signal is applied to the digital filter to control a filter characteristic thereof.

Abstract translation: 提供了一种噪声消除系统，包括：用于数字信号的输入端，所述数字信号具有第一采样率; 数字滤波器，连接到输入端以接收数字信号; 抽头，连接到输入端以接收数字信号并以低于第一采样率的第二采样率产生抽取信号; 和处理器。 处理器包括：数字滤波器的仿真，连接以接收抽取信号并产生仿真滤波器输出; 以及控制电路，用于根据仿真的滤波器输出产生控制信号。 控制信号被施加到数字滤波器以控制其滤波器特性。

公开(公告)号：WO2009081185A1

公开(公告)日：2009-07-02

申请号：PCT/GB2008/051177

申请日：2008-12-11

Applicant: WOLFSON MICROELECTRONICS PLC ,  SIBBALD, Alastair ,  ALCOCK, Robert David

Inventor： SIBBALD, Alastair ,  ALCOCK, Robert David

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3056

Abstract: A noise cancellation system is provided, for generating a noise cancellation signal to be added to a wanted signal to mitigate the effects of ambient noise. The system comprises: an input, for receiving an input signal representing ambient noise; a detector, for detecting a magnitude of said input signal; and a voice activity detector, for determining voiceless periods when said input signal does not contain a signal representing a voice. The detector is adapted to detect the magnitude of said input signal during said voiceless periods, and the system is adapted to operate in a first mode when said input signal is above a threshold value, and a second mode when said input signal is below the threshold value. The first mode comprises generating a noise cancellation signal with a first magnitude for at least partially cancelling the ambient noise. The second mode comprises generating a noise cancellation signal with a second magnitude that is less than the first magnitude.

Abstract translation: 提供了一种噪声消除系统，用于产生要添加到所需信号的噪声消除信号以减轻环境噪声的影响。 该系统包括：用于接收表示环境噪声的输入信号的输入; 检测器，用于检测所述输入信号的大小; 以及语音活动检测器，用于当所述输入信号不包含表示语音的信号时确定无声时段。 所述检测器适于在所述无声周期期间检测所述输入信号的幅度，并且当所述输入信号高于阈值时，所述系统适于在第一模式下操作，以及当所述输入信号低于所述阈值时，所述第二模式 值。 第一模式包括产生具有第一量值的噪声消除信号以至少部分地消除环境噪声。 第二模式包括产生具有小于第一量值的第二量值的噪声消除信号。

公开(公告)号：WO2009037480A2

公开(公告)日：2009-03-26

申请号：PCT/GB2008/003192

申请日：2008-09-18

Applicant: WOLFSON MICROELECTRONICS PLC ,  LAMING, Richard, Ian ,  JENKINS, Colin, Robert

Inventor： LAMING, Richard, Ian ,  JENKINS, Colin, Robert

IPC: B81B3/00

CPC classification number: B81B3/0072 ,  B81B2201/0257 ,  H04R19/04 ,  H04R2499/11

Abstract: A MEMS transducer comprises a substrate (124). A membrane layer (120) is supported by the substrate (124). A back-plate layer (110) is supported by the membrane layer (120), said back-plate layer comprising a respective sidewall portion and a respective raised portion. One or more columns (116) are provided separate from the sidewall portion of the back-plate layer, said columns (116) connecting the back-plate layer, the membrane layer and the substrate.

Abstract translation: MEMS换能器包括基底（124）。 膜层（120）由衬底（124）支撑。 背板层（110）由膜层（120）支撑，所述背板层包括相应的侧壁部分和相应的凸起部分。 一个或多个柱（116）设置成与背板层的侧壁部分分离，所述柱（116）连接背板层，膜层和基板。

公开(公告)号：WO2009037458A3

公开(公告)日：2009-03-26

申请号：PCT/GB2008/003165

申请日：2008-09-18

Applicant: WOLFSON MICROELECTRONICS PLC ,  LAMING, Richard, Ian ,  JENKINS, Colin, Robert

Inventor： LAMING, Richard, Ian ,  JENKINS, Colin, Robert

IPC: B81B3/00 ,  H04R19/00

Abstract: A MEMS device comprises a back-plate (7) having an inner portion (7a) and an outer portion (7b), the inner portion (7a) connected to the outer portion (7b) by a sidewall (7c). A raised section or anchor ring (60) is formed in the outer portion (7b) of the back-plate, in a region of the back-plate near the inner perimeter of the outer portion. The anchor ring may comprise angled sidewalls. The thickness of the back-plate may be greater than the thickness of the material supporting the anchor ring. Embodiments are also disclosed in which a membrane comprises a raised portion and an outer portion connected by an angled sidewall.

公开(公告)号：WO2008139155A1

公开(公告)日：2008-11-20

申请号：PCT/GB2008/001601

申请日：2008-02-08

Applicant: WOLFSON MICROELECTRONICS PLC ,  SIBBALD, Alastair

Inventor： SIBBALD, Alastair

IPC: G10K11/178 ,  H04R3/00

CPC classification number: G10K11/16 ,  G10K11/178 ,  G10K2210/1081 ,  H04M1/6066 ,  H04M1/7253 ,  H04R1/1041 ,  H04R1/1083 ,  H04R5/033 ,  H04R2420/05 ,  H04R2499/11

Abstract: Noise reduction circuitry for a communication apparatus can apply different noise reduction transfer functions, depending on whether a listening device is connected to the apparatus. If no listening device is connected, the noise reduction transfer function can be adapted for use with microphones 12 and speakers 28 that form an integral part of the communication apparatus, which may be a cellular telephone. If a listening device is connected, the noise reduction transfer function can be adapted for use with microphones 12 and speakers 28 that form a part of the listening device. This allows the noise reduction circuitry to provide improved noise reduction performance.

Abstract translation: 用于通信设备的降噪电路可以根据听音设备是否连接到该设备来应用不同的降噪传递功能。 如果没有连接听音装置，则降噪传递功能可适用于形成通信装置的组成部分的麦克风12和扬声器28，麦克风12和扬声器28可以是蜂窝电话。 如果连接了听音装置，则降噪传递功能可适用于构成聆听装置一部分的麦克风12和扬声器28。 这允许降噪电路提供改进的降噪性能。

公开(公告)号：WO2008099137A1

公开(公告)日：2008-08-21

申请号：PCT/GB2008/000400

申请日：2008-02-06

Applicant: WOLFSON MICROELECTRONICS PLC ,  SIBBALD, Alastair ,  HOWLE, Martin

Inventor： SIBBALD, Alastair ,  HOWLE, Martin

IPC: H04R1/22 ,  H04R1/10

CPC classification number: H04R3/002 ,  H04R1/1008 ,  H04R1/1016 ,  H04R1/1083 ,  H04R1/2873

Abstract: An ear-worn speaker carrying device ("ESD") incorporating active ambient noise reduction circuitry is provided with a seal intended to contact or surround the ear of a user; the seal being intended to present a substantial impedance to inward or outward transmission of sound to or from the ear. At least one acoustic channel of predetermined dimensions bypasses the seal to providing an acoustic leakage path of known characteristics, thereby permitting predetermined levels of sound to enter and exit by way of the channel, such that minor variations in leakage, dependent, for example, upon precise mounting of the seal to the ear as used from time to time, are rendered relatively unimportant. In a preferred embodiment, the device further comprises an acoustic conduit connected to vent the speaker's rear surface to the external ambient, and respective exit apertures for the acoustic channel and the acoustic conduit are so relatively located that sounds exiting from them tend to cancel each other, reducing sound emissions from the device.

Abstract translation: 包含有效环境噪声降低电路的耳式扬声器承载装置（“ESD”）具有旨在接触或围绕使用者耳朵的密封件; 密封件旨在呈现对来自耳朵或从耳朵的声音的向内或向外传输的实质阻抗。 具有预定尺寸的至少一个声通道绕过密封件以提供已知特性的声学泄漏路径，从而允许预定水平的声音通过通道进入和离开，使得泄漏的微小变化依赖于例如 不时将密封件精确地安装到耳朵上是相对不重要的。 在优选实施例中，该装置还包括连接到扬声器后表面以将外部环境排放的声导管，并且用于声学通道和声导管的相应出口孔相对定位，使得从它们离开的声音倾向于彼此抵消 ，减少设备的声音排放。