公开(公告)号：US10397701B2

公开(公告)日：2019-08-27

申请号：US16175907

申请日：2018-10-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lars Risbo ,  Ryan Erik Lind ,  Jasjot Singh Chadha

IPC: H04R3/00 ,  H04R3/02 ,  H03F3/217 ,  H03F3/185 ,  H03F3/30 ,  H03F3/45

Abstract: A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.

公开(公告)号：US10313787B2

公开(公告)日：2019-06-04

申请号：US14827265

申请日：2015-08-14

Applicant: Texas Instruments Incorporated

Inventor： Lars Risbo ,  Anker Bjørn-Josefsen ,  Kim N. Madsen

IPC: H03G11/00 ,  H04R3/00 ,  H04R29/00

Abstract: A predictive back-emf protection methodology for an electromechanical system, including a signal processor that processes a source signal to provide a modified source signal, a driver that converts the modified source signal to a drive signal, and an electromechanical transducer that generates, from the drive signal, a transducer response, and a back-emf signal coupled back to the driver output. A predictive back-emf generator (such as a routine in the signal processor) is characterized by a back-emf transfer function (linear parameterized model of the electromechanical transducer) for transforming an input signal into a transform back-emf representation of a back-emf signal predicted by the back-emf transfer function as a response of the electromechanical transducer to such input signal. The signal processor processes the source signal based on the transform back-emf representation to generate the modified source signal input to the driver. An example application is limiting peaking current in an audio system.

公开(公告)号：US20160057533A1

公开(公告)日：2016-02-25

申请号：US14827265

申请日：2015-08-14

Applicant: Texas Instruments Incorporated

Inventor： Lars Risbo ,  Anker Bjørn-Josefsen ,  Kim N. Madsen

IPC: H04R3/00

CPC classification number: H04R3/007 ,  H04R3/00 ,  H04R29/001 ,  H04R2203/00

Abstract: A predictive back-emf protection methodology for an electromechanical system, including a signal processor that processes a source signal to provide a modified source signal, a driver that converts the modified source signal to a drive signal, and an electromechanical transducer that generates, from the drive signal, a transducer response, and a back-emf signal coupled back to the driver output. A predictive back-emf generator (such as a routine in the signal processor) is characterized by a back-emf transfer function (linear parameterized model of the electromechanical transducer) for transforming an input signal into a transform back-emf representation of a back-emf signal predicted by the back-emf transfer function as a response of the electromechanical transducer to such input signal. The signal processor processes the source signal based on the transform back-emf representation to generate the modified source signal input to the driver. An example application is limiting peaking current in an audio system.

Abstract translation: 一种用于机电系统的预测反电动势保护方法，包括处理源信号以提供修改的源信号的信号处理器，将修改的源信号转换为驱动信号的驱动器，以及从机电系统 驱动信号，换能器响应以及耦合回驱动器输出的反电动势信号。 预测的反电动势发生器（例如信号处理器中的例程）的特征在于用于将输入信号变换为后向电动势的变换反电动势表示的反电动势传递函数（机电变换器的线性参数化模型） emf信号由反电动势传递函数预测为机电换能器对这种输入信号的响应。 信号处理器基于变换反电动势表示来处理源信号，以产生输入到驱动器的修改的源信号。 示例应用程序限制音频系统中的峰值电流。

公开(公告)号：US20190069087A1

公开(公告)日：2019-02-28

申请号：US16175907

申请日：2018-10-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lars Risbo ,  Ryan Erik Lind ,  Jasjot Singh Chadha

IPC: H04R3/02 ,  H03F3/217 ,  H03F3/30 ,  H03F3/45 ,  H03F3/185 ,  H04R3/00

CPC classification number: H04R3/02 ,  H03F3/185 ,  H03F3/2173 ,  H03F3/3022 ,  H03F3/45192 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2200/411 ,  H04R3/00

Abstract: A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.

公开(公告)号：US09967663B2

公开(公告)日：2018-05-08

申请号：US14956492

申请日：2015-12-02

Applicant: Texas Instruments Incorporated

Inventor： Anker Bjoern-Josefsen ,  Lars Risbo ,  Theis Christiansen

IPC: H04R3/00 ,  H04R29/00 ,  G10L19/018 ,  G10L21/034 ,  H03G7/00 ,  H03G9/02

CPC classification number: H04R3/007 ,  G10L19/018 ,  G10L21/034 ,  H03G7/002 ,  H03G9/025 ,  H04R3/002 ,  H04R29/001

Abstract: Systems and methods for loudspeaker protection against excessive excursion are described. In an illustrative, non limiting embodiment, a method may include splitting an input signal into two or more signals, each of the two or more signals within a given frequency band; independently selecting between a power attenuation or an excursion attenuation for each of the two or more signals; independently applying the selected power attenuation or excursion attenuation to each of the two or more signals; combining the attenuated two or more signals into an output signal; and providing the output signal to a loudspeaker.

公开(公告)号：US09930452B2

公开(公告)日：2018-03-27

申请号：US15395290

申请日：2016-12-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lars Risbo ,  Ryan Erik Lind ,  Jasjot Singh Chadha

IPC: H04B15/00 ,  H04R3/02 ,  H03F3/217 ,  H03F3/185

CPC classification number: H04R3/02 ,  H03F3/185 ,  H03F3/2173 ,  H03F3/3022 ,  H03F3/45192 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2200/411 ,  H04R3/00

Abstract: A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.

公开(公告)号：US20180176683A1

公开(公告)日：2018-06-21

申请号：US15897177

申请日：2018-02-15

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lars Risbo ,  Ryan Erik Lind ,  Jasjot Singh Chadha

IPC: H04R3/02 ,  H03F3/185 ,  H03F3/217

CPC classification number: H04R3/02 ,  H03F3/185 ,  H03F3/2173 ,  H03F3/3022 ,  H03F3/45192 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2200/411 ,  H04R3/00

Abstract: A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.

公开(公告)号：US09661430B2

公开(公告)日：2017-05-23

申请号：US14810199

申请日：2015-07-27

Applicant: Texas Instruments Incorporated

Inventor： Lars Risbo ,  Theis Harboe Christiansen

IPC: H04R29/00 ,  H04R1/28

CPC classification number: H04R29/001 ,  H04R1/2834

Abstract: Methods for modeling a loudspeaker having a passive radiator include applying a stimulus signal to a speaker within the cabinet, wherein the stimulus is applied over a frequency range. The sound pressure level (SPL) in the cabinet is measured as a function of frequency during application of the stimulus signal. At least one coefficient based on the measured SPL is derived, wherein at least one passive radiator parameter is a function of the at least one coefficient.

公开(公告)号：US10158942B2

公开(公告)日：2018-12-18

申请号：US15897177

申请日：2018-02-15

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lars Risbo ,  Ryan Erik Lind ,  Jasjot Singh Chadha

IPC: H04B15/00 ,  H04R3/02 ,  H03F3/217 ,  H03F3/185 ,  H03F3/30 ,  H03F3/45 ,  H04R3/00

Abstract: A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.

公开(公告)号：US20160192070A1

公开(公告)日：2016-06-30

申请号：US14956492

申请日：2015-12-02

Applicant: Texas Instruments Incorporated

Inventor： Anker Bjoern-Josefsen ,  Lars Risbo ,  Theis Christiansen

IPC: H04R3/00 ,  G10L19/018 ,  G10L19/02 ,  H04R29/00

CPC classification number: H04R3/007 ,  G10L19/018 ,  G10L21/034 ,  H03G7/002 ,  H03G9/025 ,  H04R3/002 ,  H04R29/001

Abstract: Systems and methods for loudspeaker protection against excessive excursion are described. In an illustrative, non limiting embodiment, a method may include splitting an input signal into two or more signals, each of the two or more signals within a given frequency band; independently selecting between a power attenuation or an excursion attenuation for each of the two or more signals; independently applying the selected power attenuation or excursion attenuation to each of the two or more signals; combining the attenuated two or more signals into an output signal; and providing the output signal to a loudspeaker.

Abstract translation: 描述用于扬声器防止过度偏移的系统和方法。 在说明性的非限制性实施例中，一种方法可以包括将输入信号分成两个或更多个信号，给定频带内的两个或更多个信号中的每一个; 在所述两个或更多个信号中的每一个上独立地选择功率衰减或偏移衰减; 独立地对所述两个或更多个信号中的每个信号施加所选择的功率衰减或偏移衰减; 将衰减的两个或更多个信号组合成输出信号; 并将输出信号提供给扬声器。