-
公开(公告)号：US20130237285A1
公开(公告)日：2013-09-12
申请号：US13869726
申请日：2013-04-24
Applicant: WOLFSON MICROELECTRONICS PLC
Inventor： David Sinai
IPC: H04M1/02
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.
-
公开(公告)号：US09473098B2
公开(公告)日：2016-10-18
申请号：US14182445
申请日：2014-02-18
Applicant: Wolfson Microelectronics plc
Inventor： John Paul Lesso
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 comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier; and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal.
Abstract translation: 放大器电路包括用于接收待放大的输入信号的输入端; 前置放大器，用于基于可变增益放大输入信号; 用于放大从前置放大器输出的信号的功率放大器; 以及用于向功率放大器提供一个或多个电源电压的可变电压电源。 电源电压根据可变增益或输入数字信号进行调整。 根据本发明的其他方面，使用时钟信号对放大器电路的电源进行定时，由此时钟信号具有根据音量信号或输入信号而变化的频率。
-
公开(公告)号：US09300212B2
公开(公告)日：2016-03-29
申请号：US13953317
申请日：2013-07-29
Applicant: Wolfson Microelectronics plc
CPC classification number: H02M3/1588 , H02M1/38 , H02M2001/0009 , H02M2001/0032 , Y02B70/1466
Abstract: Methods and apparatus for control of DC-DC converters, especially in valley current mode. The DC-DC converter is operable so that a low side supply switch may be turned off, before the high side supply switch is turned on. During the period when both switches are off the current loop control remains active and the change in inductor (L) current is emulated. One embodiment uses a current sensor for lossless current sensing and emulates the change in inductor current by holding the value of the output of the current sensor (ISNS) at the time that the low side switch turns off and adding an emulated ramp signal (VISLP) until the inductor current reaches zero. Embodiment employing a pulse-skip mode of operation based on a minimum conduction time are also disclosed. The invention enables a seamless transition from Continuous Conduction Mode the Discontinuous Conduction Mode and Pulse Skipping and provide converters that are efficient at low current loads.
-
公开(公告)号：US20150256925A1
公开(公告)日：2015-09-10
申请号：US14437685
申请日：2013-10-10
Applicant: WOLFSON MICROELECTRONICS PLC
Inventor： John Paul Lesso
Abstract: This application relates to digital-to-analogue conversion with improved noise performance. Embodiments relate to digital-to-analogue conversion circuits (300) for converting a digital audio signal to an analogue audio signal having a digital-to-analogue converter (104) operable at a plurality of DAC clock rates. A first clock controller (301-1) controls the DAC clock rate based on an indication of the amplitude of the audio signal. The DAC clock rate (CK1) may be increased for low amplitude signal, where noise is important, to reduce the in-band thermal noise of the DAC. At higher amplitudes, when noise is less audible, the DAC clock rate may be reduced to avoid distortion. The amplitude of the audio signal may be monitored by a digital level detector (302) or in some cases by an analogue level detector (303). The DAC may be an oversampling DAC with an input interpolator (101) The conversion circuit may also include a word-length reduction module (102) and a dynamic error matching module (103) whose clock rates may also be varied based on the signal.
Abstract translation: 该应用涉及具有改进的噪声性能的数模转换。 实施例涉及用于将数字音频信号转换为模拟音频信号的数模转换电路（300），模拟音频信号具有可以多个DAC时钟速率工作的数模转换器（104）。 第一时钟控制器（301-1）基于音频信号的幅度的指示来控制DAC时钟速率。 对于噪声很重要的低幅度信号，DAC时钟频率（CK1）可能会增加，以降低DAC的带内热噪声。 在较高的幅度下，当噪声较小时，DAC时钟频率可能会降低，以避免失真。 音频信号的幅度可以由数字电平检测器（302）监视，或者在某些情况下由模拟电平检测器（303）监视。 DAC可以是具有输入内插器的过采样DAC（101）。转换电路还可以包括字长减小模块（102）和动态误差匹配模块（103），其时钟速率也可以基于该信号而变化。
-
公开(公告)号：US09020157B2
公开(公告)日：2015-04-28
申请号：US13796120
申请日：2013-03-12
Applicant: Wolfson Microelectronics plc
Inventor： Julian Penketh , Abid Rashid
IPC: A61F11/06 , G10K11/16 , H03B29/00 , G10K11/175 , G10K11/178
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。
-
Patent Agency Ranking
公开(公告)号：US09019012B2
公开(公告)日：2015-04-28
申请号：US13677182
申请日：2012-11-14
Applicant: Wolfson Microelectronics plc
Inventor： John Paul Lesso
IPC: H03F3/217
CPC classification number: H03F3/217
Abstract: Methods and apparatus for Class-D amplifier circuits with D.C. offset control/correction. A Class-D amplifier is described having an output stage, such as a full H-bridge or half bridge, with a plurality of switches operable to provide a plurality of output states comprising at least a positive output state and a negative output state. Control circuitry is configured to receive a first signal based on the input signal and produce a digital control signal, which is used to determine the switch state of the output stage. A digital integrator is configured to receive a feedback signal indicative of the output state of the output stage and to sample the feedback signal at a sample rate and produce an integrated output signal (INT, IVC) indicating the difference in number of instances of the positive output state and the negative output state. Correction circuitry subtracts the integrated output signal from the input signal to produce a D.C. offset corrected signal.
Abstract translation: 具有D.C.偏移控制/校正的D类放大器电路的方法和装置。 描述了具有诸如全H桥或半桥的输出级的D类放大器，其中多个开关可操作以提供至少包括正输出状态和负输出状态的多个输出状态。 控制电路被配置为基于输入信号接收第一信号并产生用于确定输出级的开关状态的数字控制信号。 数字积分器被配置为接收指示输出级的输出状态的反馈信号，并以采样速率对反馈信号进行采样，并产生一个积分输出信号（INT，IVC），该信号表示正数的实例数 输出状态和负输出状态。 校正电路从输入信号中减去积分输出信号，产生D.C.偏移校正信号。
-
公开(公告)号：US08987844B2
公开(公告)日：2015-03-24
申请号：US14176811
申请日：2014-02-10
Applicant: Wolfson Microelectronics plc
Inventor： Colin Robert Jenkins , Tsjerk Hans Hoekstra , Euan James Boyd
CPC classification number: H04R19/005 , B81B3/0021 , B81B3/0075 , B81B2201/0257 , B81B2201/0264 , B81B2203/0127 , B81C1/00158 , H01L41/09 , H01L41/0926 , H01L2224/16225 , H01L2224/48091 , H01L2924/1461 , H01L2924/16151 , H01L2924/16152 , H04R1/222 , H04R23/006 , H04R2201/003 , Y10T29/49005 , H01L2924/00014
Abstract: A MEMS capacitive transducer with increased robustness and resilience to acoustic shock. The transducer structure includes a flexible membrane supported between a first volume and a second volume, and at least one variable vent structure in communication with at least one of the first and second volumes. The variable vent structure includes at least one moveable portion which is moveable in response to a pressure differential across the moveable portion so as to vary the size of a flow path through the vent structure. The variable vent may be formed through the membrane and the moveable portion may be a part of the membrane, defined by one or more channels, that is deflectable away from the surface of the membrane. The variable vent is preferably closed in the normal range of pressure differentials but opens at high pressure differentials to provide more rapid equalization of the air volumes above and below the membrane.
-
公开(公告)号：US20140307910A1
公开(公告)日：2014-10-16
申请号：US14244075
申请日：2014-04-03
Applicant: Wolfson Microelectronics plc
IPC: H04R3/00
CPC classification number: H04R3/00 , H03F3/183 , H03F2200/03 , H03G3/348 , H04R29/004 , H04R2420/03 , H04R2420/05
Abstract: A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias to a device microphone contact of the device connector via a biasing path. A capacitor is connected between a reference voltage node and a capacitor node of the biasing path. A first switch is located between the capacitor node and the device microphone contact. Detection circuitry detects disconnection of the peripheral connector and device connector; and control circuitry controls the switch to disable the biasing path.
Abstract translation: 用于与具有麦克风的可移动外围设备一起使用的主机设备，以及用于所述麦克风的偏置电路。 主机设备可以具有用于与相应的外围连接器形成配合连接的设备连接器。 偏置源被布置成经由偏置路径向设备连接器的设备麦克风接触件提供电偏压。 电容器连接在参考电压节点和偏置路径的电容器节点之间。 第一个开关位于电容器节点和设备麦克风接点之间。 检测电路检测外围连接器和设备连接器的断开; 并且控制电路控制开关以禁用偏置路径。
-
公开(公告)号：US08803261B2
公开(公告)日：2014-08-12
申请号：US14203131
申请日：2014-03-10
Applicant: Wolfson Microelectronics plc
Inventor： Anthony Bernard Traynor , Richard Ian Laming , Tsjerk H. Hoekstra
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.
-
公开(公告)号：US20140159816A1
公开(公告)日：2014-06-12
申请号：US14182445
申请日：2014-02-18
Applicant: WOLFSON MICROELECTRONICS PLC
Inventor： John Paul Lesso
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 comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier; and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal.
Abstract translation: 放大器电路包括用于接收待放大的输入信号的输入端; 前置放大器，用于基于可变增益放大输入信号; 用于放大从前置放大器输出的信号的功率放大器; 以及用于向功率放大器提供一个或多个电源电压的可变电压电源。 电源电压根据可变增益或输入数字信号进行调整。 根据本发明的其他方面，使用时钟信号对放大器电路的电源进行定时，由此时钟信号具有根据音量信号或输入信号而变化的频率。
-
-
-
-
-
-
-
-
-
Search Results
52
records
(took 0.025 seconds)
