公开(公告)号：US20140003613A1

公开(公告)日：2014-01-02

申请号：US13919743

申请日：2013-06-17

Applicant: Wolfson Microelectronics plc

Inventor： Alastair Sibbald

IPC: G10K11/178

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.

Abstract translation: 前馈环境噪声降低装置包括在壳体内的用于将声能引导到收听者的耳朵中的扬声器装置。 设置在外壳外部，并被定位成在到达听众耳朵的途中感测环境噪声，是能够将感测到的环境噪声转换成电信号以应用于扬声器的多个麦克风装置，以产生与环境噪声相反的声信号。 重要的是，整体布置使得声音信号由所述扬声器装置在与所述环境噪声到达所述收听者的耳朵的实质时间对准中产生。

公开(公告)号：US20130308786A1

公开(公告)日：2013-11-21

申请号：US13952035

申请日：2013-07-26

Applicant: Wolfson Microelectronics Plc

Inventor： Alastair Sibbald ,  Martin Howle

IPC: H04R3/00

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 provided with a seal intended to contact or surround the ear of a user. The seal is 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, 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 are rendered relatively unimportant. In a preferred embodiment, the device further includes 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 relatively located so that sounds exiting from them tend to cancel each other, reducing sound emissions from the device.

Abstract translation: 一种戴有扬声器的扬声器承载装置（“ESD”），其包括有效的环境降噪电路，其设置有用于接触或围绕用户耳朵的密封。 密封件旨在呈现出向耳朵或从耳朵传出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，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相对不重要。 在优选实施例中，该装置还包括连接到扬声器的后表面以将外部环境排放的声导管，并且用于声通道和声导管的相应出口孔相对定位，使得从它们出来的声音往往彼此抵消 ，减少设备的声音排放。

公开(公告)号：US20130243214A1

公开(公告)日：2013-09-19

申请号：US13796120

申请日：2013-03-12

Applicant: WOLFSON MICROELECTRONICS PLC

Inventor： Julian Penketh ,  Abid Rashid

IPC: G10K11/175

CPC classification number: G10K11/175 ,  G10K11/178 ,  G10K11/17823 ,  G10K11/17833 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3056 ,  G10K2210/503

Abstract: A noise cancellation system generates a noise cancellation signal from a signal representing ambient noise by signal processing. The signal processing applies a controllable gain value, and includes a high pass filter with a controllable cut-off frequency. A control block detects a wind amplitude. The cut-off frequency of the high pass filter is controlled based on the detected wind amplitude. A low pass function is applied to the detected wind amplitude, and the controllable gain is adjusted based on the output of the low pass function.

Abstract translation: 噪声消除系统通过信号处理从表示环境噪声的信号产生噪声消除信号。 信号处理应用可控增益值，并且包括具有可控截止频率的高通滤波器。 控制块检测风振幅。 基于检测到的风振幅来控制高通滤波器的截止频率。 对检测到的风振幅应用低通功能，并根据低通功能的输出调整可控增益。

公开(公告)号：US09363610B2

公开(公告)日：2016-06-07

申请号：US14452067

申请日：2014-08-05

Applicant: Wolfson Microelectronics plc

Inventor： Anthony Bernard Traynor ,  Richard Ian Laming ,  Tsjerk H. Hoekstra

IPC: H01L29/84 ,  H04R23/00 ,  B81B3/00 ,  H04R19/04 ,  H01L27/00 ,  H04R19/00 ,  H04R31/00

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 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背部体积部分，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。

公开(公告)号：US09236794B2

公开(公告)日：2016-01-12

申请号：US13854707

申请日：2013-04-01

Applicant: Wolfson Microelectronics plc

Inventor： John P. Lesso

IPC: H02M3/07

CPC classification number: H02M3/07 ,  H02M2003/072

Abstract: A charge pump circuit, and associated method and apparatuses, for providing a split-rail voltage supply, the circuit having a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of said states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage and centered on the voltage at the common terminal.

Abstract translation: 一种电荷泵电路及相关的方法和装置，用于提供分路电压电源，所述电路具有可在多个不同状态下操作的开关网络和用于以所述状态的顺序操作所述开关的控制器 以将正和负输出电压一起产生，跨越大约等于输入电压的电压并以公共端的电压为中心。

公开(公告)号：US20150008962A1

公开(公告)日：2015-01-08

申请号：US14322747

申请日：2014-07-02

Applicant: Wolfson Microelectronics plc

Inventor： Malcolm Blyth ,  Graeme Gordon Mackay

IPC: G01R19/04

CPC classification number: H03F1/0227 ,  H03F3/183 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/102

Abstract: Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input. Using the first digital signal provides an early indication of any increases in signal envelope whereas the second digital signal can allow a more accurate estimation.

Abstract translation: 用于检测和跟踪信号包络的方法和装置。 电路包括被配置为接收数据样本并输出与所述数据样本的幅度对应的第一值的绝对值电路。 信封跟踪器保持包络输出值，并将第一值与当前包络输出值进行比较，并且基于所述比较修改包络输出值，以提供具有预定攻击和衰减特性的包络输出值。 绝对值电路具有用于以第一采样率接收第一数字信号的第一输入和用于以高于第一采样率的第二采样率接收第一数字信号的插值版本的第二输入，并输出第一采样率 基于在第一输入处接收的样本的大小和在第二输入处接收的样本的值。 使用第一数字信号提供信号包络的任何增加的早期指示，而第二数字信号可以允许更准确的估计。

公开(公告)号：US20140112492A1

公开(公告)日：2014-04-24

申请号：US14142329

申请日：2013-12-27

Applicant: Wolfson Microelectronics plc

Inventor： Richard Clemow

IPC: G10K11/16

CPC classification number: G10K11/178 ,  G10K11/16 ,  G10K2210/1081 ,  G10K2210/3051 ,  G10K2210/3217 ,  H04R1/1083 ,  H04R3/02

Abstract: A digital circuit arrangement for an ambient noise-reduction system affording a higher degree of noise reduction than has hitherto been possible. The arrangement converts the analog signals into N-bit digital signals at sample rate f0, and then subjects the converted signals to digital filtering. The value of N in some embodiments is 1 but, in any event, is no greater than 8, and f0 may be 64 times the Nyquist sampling rate but, in any event, is substantially greater than the Nyquist sampling rate. This permits digital processing to be used without incurring group delay problems that rule out the use of conventional digital processing in this context. Furthermore, adjustment of the group delay can readily be achieved, in units of a fraction of a micro-second, providing the ability to fine tune the group delay for feed forward applications.

Abstract translation: 用于环境降噪系统的数字电路装置提供比迄今为止可能更高程度的噪声降低的数字电路装置。 该装置将模拟信号以采样率f0转换为N位数字信号，然后将转换的信号转换为数字滤波。 在一些实施例中，N的值为1但是在任何情况下都不大于8，并且f0可以是奈奎斯特采样率的64倍，但是在任何情况下都大大地高于奈奎斯特采样率。 这允许使用数字处理，而不会导致在这种情况下排除使用常规数字处理的组延迟问题。 此外，可以容易地实现组延迟的调整，以微秒的一小部分为单位，提供微调前馈应用的组延迟的能力。

公开(公告)号：US20130314151A1

公开(公告)日：2013-11-28

申请号：US13854707

申请日：2013-04-01

Applicant: Wolfson Microelectronics Plc

Inventor： John P. Lesso

IPC: H02M3/07

CPC classification number: H02M3/07 ,  H02M2003/072

Abstract: A charge pump circuit, and associated method and apparatuses, for providing a split-rail voltage supply, the circuit having a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of said states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage and centered on the voltage at the common terminal.

Abstract translation: 一种电荷泵电路及相关的方法和装置，用于提供分路电压电源，所述电路具有可在多个不同状态下操作的开关网络和用于以所述状态的顺序操作所述开关的控制器 以将正和负输出电压一起产生，跨越大约等于输入电压的电压并以公共端的电压为中心。

公开(公告)号：US20130300508A1

公开(公告)日：2013-11-14

申请号：US13942303

申请日：2013-07-15

Applicant: Wolfson Microelectronics plc

Inventor： John Paul Lesso

IPC: H03F3/193

CPC classification number: H03G3/3015 ,  H03F1/0216 ,  H03F1/0227 ,  H03F1/0261 ,  H03F1/30 ,  H03F3/185 ,  H03F3/193 ,  H03F2200/03 ,  H03F2200/504 ,  H03G3/001

Abstract: An amplifier circuit, comprising: an input, for receiving an input signal to be amplified; a power amplifier, for amplifying the input signal; a switched power supply, having a switching frequency, for providing at least one supply voltage to the power amplifier; and a dither block, for dithering the switching frequency of the switched power supply. The dither block is controlled based on the input signal. Another aspect of the invention involves using first and second switches, each having different capacitances and resistances, and using the first or second switch depending on the input signal or volume signal. Another aspect of the invention involves controlling a bias signal provided to one or more components in the signal path based on the input signal or volume signal.

公开(公告)号：US20130256816A1

公开(公告)日：2013-10-03

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: 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 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背部体积部分，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。