公开(公告)号：US10720888B2

公开(公告)日：2020-07-21

申请号：US15336995

申请日：2016-10-28

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi ,  Aaron J. Brennan ,  John L. Melanson ,  Mikel Ash

IPC: H03F3/185 ,  H03F3/217 ,  H03K7/08 ,  H03F1/02 ,  H03F1/30

Abstract: An integrated circuit may have two signal paths: an open-loop modulator (which may comprise a digital-input Class-D amplifier) and a closed-loop modulator (which may comprise an analog-input Class-D amplifier). A control subsystem may be capable of selecting either of the open-loop modulator or the closed-loop modulator as a selected path based on one or more characteristics (e.g., signal magnitude) of an input audio signal. For example, for higher-magnitude signals, the closed-loop modulator may be selected while the open-loop modulator may be selected for lower-magnitude signals. In some instances, when the open-loop modulator is selected as the selected path, the closed-loop modulator may power off, which may reduce power consumption. In addition, one or more techniques may be applied to reduce or eliminate user-perceptible audio artifacts caused by switching between the open-loop modulator and the closed-loop modulator, and vice versa.

公开(公告)号：US20180048295A1

公开(公告)日：2018-02-15

申请号：US15790863

申请日：2017-10-23

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Paul Lesso

IPC: H03K3/011

CPC classification number: H03K3/011 ,  H03F1/303 ,  H03F3/2171 ,  H03K7/08 ,  H03M1/822

Abstract: Noise introduced in an output signal of a pulse-width modulator (PWM) may be reduced by changing the time duration that a switch is driving the output node. Because the power supplies coupled to the switches are the source of noise in the output signal of the PWM, the time duration that the power supplies are driving the output may be reduced to obtain a subsequent reduction in noise in the output signal. For example, when a small signal is desired to be output by the PWM, the switches may be operated for shorter time durations. Thus, the switches couple the noise sources to ground for a duration of a cycle to reduce contribution of noise to the output. But, when a larger signal is desired to be output by the PWM, the switches may be operated for longer time durations or the conventional time durations described above.

公开(公告)号：US20170179895A1

公开(公告)日：2017-06-22

申请号：US15451882

申请日：2017-03-07

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  Christophe J. Amadi ,  John L. Melanson

IPC: H03F3/217 ,  H03F3/185

CPC classification number: H03F3/2175 ,  H03F1/0277 ,  H03F1/083 ,  H03F3/181 ,  H03F3/185 ,  H03F3/217 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/2178 ,  H03F2200/03 ,  H03F2200/231

Abstract: A method for producing an output voltage to a load may include, in a power stage comprising power converter having a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, and an output for producing the output voltage comprising a first output terminal and a second output terminal, controlling the linear amplifier to transfer electrical energy from the input source of the power stage to the load in accordance with one or more least significant bits of a digital input signal, and controlling the power converter in accordance with bits of the digital input signal other than the one or more least significant bits to sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from the input source of the power stage to the load.

公开(公告)号：US09613622B1

公开(公告)日：2017-04-04

申请号：US14324286

申请日：2014-07-07

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson

IPC: H03G3/20 ,  G10L15/20

CPC classification number: G10L15/20 ,  H03G3/32 ,  H03G9/005 ,  H03G9/025

Abstract: A personal audio device that detects speech provides for improved interaction with others. When speech is detected in a microphone output signal of a microphone that measures ambient audio sounds, the audio program being reproduced by the personal audio device may be altered, by attenuating, muting or interrupting the program material. The speech may be provided to a headset that reproduces the program material. The direction of the speech can be used to determine whether the speech is from a person other than the use of the personal audio device.

公开(公告)号：US09595868B2

公开(公告)日：2017-03-14

申请号：US14612734

申请日：2015-02-03

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric J. King

IPC: H02M3/158 ,  H03F1/02 ,  H03F3/185 ,  H03F3/217 ,  H04R1/00 ,  H03F3/181

CPC classification number: H02M3/1582 ,  H02M3/1588 ,  H03F1/0227 ,  H03F3/181 ,  H03F3/217

Abstract: A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based on a measured parameter associated with the switching power stage, select a selected operational mode of the power converter from a plurality of operational modes, and sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from an input source of the power converter to the load in accordance with the selected operational mode.A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based at least on an input signal to the switching power stage, determine the differential output voltage to be driven at the load, and based on the differential output voltage to be driven at the load, apply a switch configuration from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to generate the differential output voltage.A method may include sequentially applying a plurality of switch configurations in a power converter to selectively activate or deactivate each of the plurality of switches in order operate the power converter as a differential output buck converter, such that: during a charging phase of the power converter, the power inductor is coupled between (i) one of a first terminal of a power source and a second terminal of the power source and (ii) one of a first terminal of the output load and a second terminal of the output load; during a transfer phase of the power converter, at least one of the plurality of switches is activated in order to couple the power inductor between the first terminal of the output load and a second terminal of the output load; and the output voltage is a differential voltage between the first and second terminal of the output load.

Abstract translation: 方法可以包括在功率转换器中顺序地施加多个开关配置以选择性地激活或去激活多个开关中的每一个，以便将功率转换器作为差分输出降压转换器操作，使得：在功率转换器的充电阶段期间 功率电感器耦合在（i）电源的第一端和电源的第二端之一以及（ii）输出负载的第一端和输出负载的第二端之一; 在功率转换器的传送阶段期间，激活多个开关中的至少一个以便在输出负载的第一端子和输出负载的第二端子之间耦合功率电感器; 并且输出电压是输出负载的第一和第二端子之间的差分电压。

公开(公告)号：US09584911B2

公开(公告)日：2017-02-28

申请号：US14975015

申请日：2015-12-18

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  John L. Melanson

IPC: H03M1/00 ,  H04R3/04 ,  H03G7/00 ,  H03G9/00 ,  H03M1/12 ,  H04L1/20 ,  H04L27/26

CPC classification number: H04R3/04 ,  G10L19/167 ,  G10L21/0324 ,  H03G7/007 ,  H03G9/005 ,  H03M1/00 ,  H03M1/12 ,  H03M1/1225 ,  H03M1/18 ,  H03M2201/4135 ,  H04L1/20 ,  H04L27/2647 ,  H04R2430/01 ,  H04R2430/03

Abstract: In accordance with embodiments of the present disclosure, a multichip circuit for processing audio signals having dynamic range enhancement information over two or more integrated circuits may include a host integrated circuit and a client integrated circuit. The host integrated circuit may be configured to determine a dynamic range enhancement gain for a digital audio input signal, process the digital audio input signal in accordance with the dynamic range enhancement gain, and transmit audio data based on the processed digital audio input signal. The client integrated circuit may be coupled to the host integrated circuit and may be configured to receive the audio data and wherein the client integrated circuit is provided with the dynamic range enhancement gain and the client integrated circuit is configured to process the audio data with the dynamic range enhancement gain.

Abstract translation: 根据本公开的实施例，用于处理在两个或多个集成电路上具有动态范围增强信息的音频信号的多芯片电路可以包括主机集成电路和客户端集成电路。 主机集成电路可以被配置为确定用于数字音频输入信号的动态范围增强增益，根据动态范围增强增益处理数字音频输入信号，并且基于处理的数字音频输入信号发送音频数据。 客户端集成电路可以耦合到主机集成电路，并且可以被配置为接收音频数据，并且其中向客户端集成电路提供动态范围增强增益，并且客户端集成电路被配置为使用动态范围处理音频数据 范围增强增益。

公开(公告)号：US09578432B1

公开(公告)日：2017-02-21

申请号：US14259806

申请日：2014-04-23

Applicant: Cirrus Logic, Inc.

Inventor： Ali Abdollahzadeh Milani ,  John L. Melanson

IPC: H04R3/02 ,  H04R29/00 ,  H04R3/00

CPC classification number: H04R29/001 ,  H04R3/002 ,  H04R3/005 ,  H04R2410/05 ,  H04R2499/11

Abstract: The present invention provides a system and method encompassing a new metric and MATLAB tool box that phone makers may use to improve the design of the secondary path, in order to improve ANC performance. The metric measures how invertible the secondary path is and then evaluates ANC performance at a worst case scenario where P(z)=1 and W(z) becomes a complete predictor. The invention can be easily extended to a multi-channel ANC system.

Abstract translation: 本发明提供了一种系统和方法，其包括电话机制造商可用于改进辅助路径设计的新度量和MATLAB工具箱，以便提高ANC性能。 度量测量二次路径的可逆性，然后在最坏情况下评估ANC性能，其中P（z）= 1和W（z）成为一个完整的预测变量。 本发明可以容易地扩展到多通道ANC系统。

公开(公告)号：US09496855B2

公开(公告)日：2016-11-15

申请号：US14444087

申请日：2014-07-28

Applicant: Cirrus Logic, Inc.

Inventor： Siddharth Maru ,  John L. Melanson ,  Rahul Singh ,  Eric King ,  Thirumalai Rengachari ,  Ramin Zanbaghi ,  Arnab Kumar Dutta

IPC: H05B37/02 ,  H03K4/48 ,  H05B33/08

CPC classification number: H03K4/48 ,  H05B33/0815 ,  H05B37/02 ,  Y02B20/347

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as for LED-based light bulbs. The BJT may be switched on and off from a controller coupled to two terminals of the BJT. Through the two terminals, the control IC may dynamically adjust a reverse recovery time period of the BJT. The reverse recovery time period may be adjusted by changing an amount of base charge that accumulates on the BJT. Additional, the reverse recovery may be controlled through the use of a reverse base current source applied to the BJT after beginning switching off the BJT.

Abstract translation: 双极结型晶体管（BJT）可用于功率级DC-DC转换器，例如用于基于LED的灯泡。 BJT可以从耦合到BJT的两个端子的控制器接通和断开。 通过两个端子，控制IC可以动态地调整BJT的反向恢复时间段。 可以通过改变在BJT上积累的基本电荷的量来调整反向恢复时间段。 此外，可以通过在开始关闭BJT之后使用施加到BJT的反向基极电流源来控制反向恢复。

公开(公告)号：US09479860B2

公开(公告)日：2016-10-25

申请号：US14200458

申请日：2014-03-07

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra ,  John L. Melanson

IPC: H04R29/00 ,  H04R1/10 ,  H04R5/04

CPC classification number: H04R1/1083 ,  H04R5/04 ,  H04R2410/05 ,  H04R2460/01 ,  H04R2499/11

Abstract: Based on transducer status input signals indicative of whether headphones housing respective transducers are engaged with ears of a listener, a processing circuit may determine whether the headphones are engaged with respective ears of the listener. Responsive to determining that at least one of the headphones is not engaged with its respective ear, the processing circuit may modify at least one of a first output signal to the first transducer and a second output signal to the second transducer such that at least one of the first output signal and the second output signal is different than such signal would be if the headphones were engaged with their respective ears.

Abstract translation: 基于换能器状态输入信号，指示耳机是否包含各个换能器与收听者的耳朵接合，处理电路可以确定耳机是否与收听者的相应耳朵接合。 响应于确定耳机中的至少一个不与其相应的耳朵接合，处理电路可以将第一输出信号中的至少一个修改为第一换能器，并将第二输出信号修改为第二换能器，使得至少一个 第一输出信号和第二输出信号不同于这样的信号，如果耳机与它们各自的耳朵接合。

公开(公告)号：US09478212B1

公开(公告)日：2016-10-25

申请号：US14476471

申请日：2014-09-03

Applicant: Cirrus Logic, Inc.

Inventor： Bryant E. Sorensen ,  Jon D. Hendrix ,  John L. Melanson

IPC: G10K11/178 ,  H03G5/16 ,  H04R3/00 ,  H04R1/10 ,  H04R5/033

CPC classification number: H04R3/04 ,  G10K11/178 ,  G10K11/17815 ,  G10K11/17853 ,  G10K11/17879 ,  G10K2210/1081 ,  G10K2210/3014 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3045 ,  G10L21/0208 ,  H03G5/165 ,  H04R1/1083 ,  H04R3/005 ,  H04R5/033 ,  H04R2410/05 ,  H04R2499/11

Abstract: In accordance with embodiments of the present disclosure, an adjustable equalization filter may have a response that generates an equalized source audio signal from a source audio signal to account for effects of changes in an electro-acoustical path of the source audio signal to a transducer. An equalizer coefficient control block may adapt the response of the adjustable equalization filter in response to changes in a response of a secondary path estimate filter for modeling the electro-acoustical path of a source audio signal through the transducer, wherein a response of the secondary path estimate filter is adapted in conformity with an error microphone signal indicative of the acoustic output of the transducer.

Abstract translation: 根据本公开的实施例，可调平衡滤波器可以具有从源音频信号产生均衡的源音频信号以响应源音频信号的电声路径到换能器的影响的响应。 均衡器系数控制块可以响应于辅助路径估计滤波器的响应的变化来适应可调平衡滤波器的响应，用于通过换能器建模源音频信号的电声路径，其中次路径的响应 估计滤波器适应于指示换能器的声输出的误差麦克风信号。