公开(公告)号：US20180014121A1

公开(公告)日：2018-01-11

申请号：US15547850

申请日：2016-02-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason William LAWRENCE ,  Roberto NAPOLI ,  Roger SERWY ,  Jie SU ,  Stefan WILLIAMS ,  Rong HU ,  Firas AZRAI

IPC: H04R3/00 ,  G10L21/0272 ,  H04R3/04 ,  H04R29/00

CPC classification number: H04R3/007 ,  G10L21/0272 ,  H04R3/04 ,  H04R29/001 ,  H04R2430/01

Abstract: This application describes methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) is described having a first frequency band-splitter (102) for splitting an input audio signal (Vin) into a plurality of audio signals (v1, v2 . . . , vn) in different respective frequency bands (ω1, ω2 . . . , ωn). A first gain block (103) is configured to apply a respective frequency band gain (g1, g2 . . . , g3) to each of the audio signals in the different respective frequency bands and a gain controller (107, 108, 109) is provided for controlling the respective band gains. A displacement modeller (104, 105) determines a plurality of displacement signals (x1, x2 . . . , xn) based on the input audio signal (Vin) and a displacement model (104a) where each displacement signal corresponds to a modelled cone displacement for the loudspeaker for one of said different respective frequency bands. The gain controller (107, 108, 109) is configured to control the respective frequency band gains based on the plurality of displacement signals.

公开(公告)号：US20190116419A1

公开(公告)日：2019-04-18

申请号：US16161410

申请日：2018-10-16

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roberto NAPOLI ,  Jason William LAWRENCE

IPC: H04R3/00

Abstract: Embodiments described herein provide methods and apparatus for predicting the excursion of a transducer. The method comprises determining whether an input signal to the transducer is a periodic signal; and responsive to determining that the input signal is a periodic signal, calculating the predicted excursion based on a direct current (“DC”) offset associated with the transducer.

公开(公告)号：US20190124444A1

公开(公告)日：2019-04-25

申请号：US16226178

申请日：2018-12-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason William LAWRENCE ,  Roger David SERWY ,  Roberto NAPOLI

IPC: H04R3/00 ,  H04R3/04 ,  H04R29/00

Abstract: This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system receives a digital audio signal comprising a plurality of samples at an input node. A delay block delays the digital audio signal and a gain block applies a controlled gain to the delayed digital audio signal. An excursion predictor is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller controls a gain setting of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller is configured to determine at least one gain setting {ga gi} to be applied to a set of samples {Va . . . Vi} of the audio signal delayed by the delay block where the set of samples of the audio signal corresponds to a time-span which is less than an impulse response settling time of the loudspeaker.

公开(公告)号：US20190110145A1

公开(公告)日：2019-04-11

申请号：US16154984

申请日：2018-10-09

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason William LAWRENCE ,  Antonio Jesus DIEZ ELORZA

IPC: H04R29/00 ,  H04R3/00 ,  H03F1/30 ,  H03F1/52

CPC classification number: H04R29/003 ,  H03F1/30 ,  H03F1/52 ,  H03F3/181 ,  H03F2200/03 ,  H03F2200/447 ,  H03F2200/468 ,  H04R3/007 ,  H04R9/022

Abstract: Embodiments described herein provide a method in a thermal model based estimator and a thermal model based estimator for estimating a temperature of a transducer. The method comprises receiving a first signal wherein the first signal is representative of an impedance across the transducer; receiving an indication of a current across the transducer; determining an estimated thermal power based on the indication of the current and an estimated temperature signal, determining, based on the estimated thermal power, the estimated temperature signal using a thermal model of the transducer comprising states defined by a thermal state vector; comparing the first signal with a second signal derived from the estimated temperature signal; updating the thermal state vector of the thermal model based on the comparison; and; outputting the estimated temperature signal.

公开(公告)号：US20180367897A1

公开(公告)日：2018-12-20

申请号：US16006139

申请日：2018-06-12

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ylva Ellen Maria BJORK ,  Erik Vilhelm LINDAHL ,  Jason William LAWRENCE ,  Christopher EKBOM

IPC: H04R3/00 ,  H04R29/00 ,  G01K7/16

CPC classification number: H04R3/007 ,  G01K7/16 ,  G01K2217/00 ,  H04R29/001 ,  H04R29/003

Abstract: Methods and Apparatus for estimating a temperature of an electromechanical transducer. The method comprising receiving an audio signal (901); providing an output signal to the electromechanical transducer, based on the audio signal (902); and determining whether a first magnitude of the audio signal in a first frequency band is above a magnitude threshold (903). In response to the first magnitude being above or equal to the magnitude threshold, calculating a first impedance of the electromechanical transducer based on measurements of a first voltage and a first current of the electromechanical transducer within the first frequency band (905), and estimating the temperature of the electromechanical transducer based on the first impedance (907). In response to the first magnitude being below the magnitude threshold, inserting a pilot tone into the audio signal (909), wherein the pilot tone is at a pilot tone frequency, calculating a second impedance of the electromechanical transducer based on measurements of a second voltage and a second current of the electromechanical transducer at the pilot tone frequency (911), and estimating the temperature of the electromechanical transducer based on the second impedance (913).

公开(公告)号：US20180184201A1

公开(公告)日：2018-06-28

申请号：US15905319

申请日：2018-02-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason William LAWRENCE ,  Roger David SERWY ,  Roberto NAPOLI

IPC: H04R3/00 ,  H04R29/00 ,  H04R3/04

CPC classification number: H04R3/007 ,  H04R3/04 ,  H04R29/003

Abstract: This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) receives a digital audio signal comprising a plurality of samples at an input node (IN). A delay block (15) delays the digital audio signal and a gain block (14) applies a controlled gain to the delayed digital audio signal. An excursion predictor (12) is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller (23) controls a gain setting (g) of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller (23) is configured to determine at least one gain setting {ga gi} to be applied to a set of samples {Va . . . Vi} of the audio signal delayed by the delay block where the set of samples of the audio signal corresponds to a time-span which is less than an impulse response settling time of the loudspeaker.

公开(公告)号：US20180014120A1

公开(公告)日：2018-01-11

申请号：US15547836

申请日：2016-02-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason William LAWRENCE ,  Roberto NAPOLI ,  Roger David SERWY ,  Jie SU ,  Stefan WILLIAMS ,  Rong HU ,  Firas AZRAI

IPC: H04R3/00 ,  G10L21/0272 ,  H04R3/04 ,  H04R29/00

CPC classification number: H04R3/007 ,  G10L21/0272 ,  H04R3/04 ,  H04R29/001 ,  H04R2430/01

Abstract: This application describes methods and apparatus for loudspeaker protection. A loudspeaker protection system (1100) is described having a first frequency band-splitter (102) for splitting an input audio signal (Vin) into a plurality of audio signals (v1, v2 . . . ,vn) in different respective frequency bands (ω1, ω2 . . . ωη). A first gain block (103) is configured to apply a respective frequency band gain (gt1, gt2 . . . ,gt3) to each of the audio signals in the different respective frequency bands and a gain controller (109; 1101) is provided for controlling the respective band gains. A thermal controller (1101) determines, for each of a plurality of the different respective frequency bands, a power dissipation for the loudspeaker in that frequency band and also determines a respective thermal gain setting based on the determined power dissipation for that frequency band. The gain controller is configured to control the respective frequency band gains based on the thermal gain settings.

公开(公告)号：US20160373858A1

公开(公告)日：2016-12-22

申请号：US15186992

申请日：2016-06-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason William LAWRENCE ,  Roger David SERWY ,  Roberto NAPOLI

IPC: H04R3/00 ,  H04R3/04 ,  H04R29/00

CPC classification number: H04R3/007 ,  H04R3/04 ,  H04R29/003

Abstract: This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) receives a digital audio signal comprising a plurality of samples at an input node (IN). A delay block (15) delays the digital audio signal and a gain block (14) applies a controlled gain to the delayed digital audio signal. An excursion predictor (12) is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller (23) controls a gain setting (g) of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller (23) is configured to determine at least one gain setting {ga gi} to be applied to a set of samples {Va . . . Vi} of the audio signal delayed by the delay block where the set of samples of the audio signal corresponds to a time-span which is less than an impulse response settling time of the loudspeaker.

Abstract translation: 本申请涉及用于扬声器保护的方法和装置。 扬声器保护系统（100）在输入节点（IN）处接收包括多个样本的数字音频信号。 延迟块（15）延迟数字音频信号，并且增益块（14）对延迟的数字音频信号施加受控增益。 偏移预测器（12）被配置为从延迟块的上游的信号路径接收音频信号的版本，并且基于音频信号确定扬声器的预测偏移。 增益控制器（23）响应于预测的偏移和第一扬声器脉冲响应模型和预定的偏移极限来控制增益块的增益设置（g）。 增益控制器（23）被配置为确定要应用于一组样本{Va的增益设置{ga gi} 。 。 其中音频信号的样本集合对应于小于扬声器的脉冲响应建立时间的时间跨度的延迟块延迟的音频信号的Vi。