公开(公告)号：US20170094408A1

公开(公告)日：2017-03-30

申请号：US14867758

申请日：2015-09-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roberto Napoli ,  Jason William Lawrence

IPC: H04R3/00 ,  H03G3/00 ,  H04R29/00 ,  H03G3/20

CPC classification number: H04R3/007 ,  H03F1/52 ,  H03G3/001 ,  H03G3/20 ,  H03G3/3005 ,  H03G7/002 ,  H04R29/003 ,  H04R2430/01

Abstract: This application relates to methods and apparatus for thermal protection of a loudspeaker (102). A controller (106) is configured to generate a control signal (Gmod) for modulating the gain of a signal processing chain (101) that drives the loudspeaker. The controller is configured such that the control signal is generated as a function of each of: an indication of voice coil temperature of the loudspeaker (TVC); an indication of power dissipation in the voice coil of the loudspeaker (PVC); and an indication of a reservoir temperature (Tres) of a thermal reservoir for heat flow from the voice coil. The reservoir temperature may be an ambient temperature of the environment or a temperature of a component of the loudspeaker or apparatus that acts as a heat sink.

公开(公告)号：US11949382B2

公开(公告)日：2024-04-02

申请号：US17894799

申请日：2022-08-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Philip Clarkin ,  Ivan Perry ,  Mark H. Tovell ,  Roberto Napoli ,  David Rhodes

IPC: H03F1/02 ,  H03F3/217 ,  H03M1/12 ,  H04R3/00

CPC classification number: H03F1/0227 ,  H03F3/217 ,  H03M1/12 ,  H04R3/007 ,  H03F2200/03

Abstract: The present disclosure relates to circuitry comprising: amplifier circuitry configured to receive a variable supply voltage, wherein the supply voltage varies according to an output signal of the amplifier circuitry; monitoring circuitry configured to monitor one or more parameters of an output signal of the amplifier circuitry; and processing circuitry configured to receive an indication of the voltage of the variable supply voltage and an indication of the monitored parameters from the monitoring circuitry and to apply a correction to one or more of the monitored parameters to compensate for coupling between the variable supply voltage and the monitoring circuitry.

公开(公告)号：US10728660B2

公开(公告)日：2020-07-28

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：US10356521B2

公开(公告)日：2019-07-16

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

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：US10341768B2

公开(公告)日：2019-07-02

申请号：US15805901

申请日：2017-11-07

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Rong Hu ,  Roberto Napoli ,  Jie Su

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

Abstract: A speaker model may implement a direct voltage-to-excursion model in an adaptive filter for modeling the speaker without developing a first electrical-only model and then converting the model to a mechanical model. The voltage-to-excursion model may allow for modeling of different kinds of speakers, such as sealed, ported, or vented speakers. A transfer function may be developed in the adaptive filter for the voltage-to-excursion model, and that transfer function re-used for prediction of excursion values based on an audio signal. Speaker protection may be performed to take steps to prevent speaker damage when a predicted excursion value exceeds safe limits. The voltage-to-excursion model may operate in displacement or displacement-related domains (e.g., velocity and back emf).

公开(公告)号：US10284950B2

公开(公告)日：2019-05-07

申请号：US15878976

申请日：2018-01-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roberto Napoli ,  Rong Hu ,  Jie Su

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

Abstract: The reliability and resilience of a speaker in a portable device may be improved by enabling the device to determine a status of an enclosure of a transducer. The impedance profiles of transducers vary depending on the enclosure status, whether the enclosure is leaky, ported, or sealed. Determination of parameters related to an impedance of a transducer may aid in a determination of the status of the enclosure. Once an enclosure status is determined, that information may be used to determine an excursion model for the transducer. Adapting the excursion model or other audio processing parameters can improve protection and performance of the transducer.

公开(公告)号：US20180220233A1

公开(公告)日：2018-08-02

申请号：US15878976

申请日：2018-01-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roberto Napoli ,  Rong Hu ,  Jie Su

IPC: H04R3/00 ,  H04R29/00

CPC classification number: H04R3/007 ,  H04R3/00 ,  H04R29/00 ,  H04R29/001 ,  H04R29/003 ,  H04R2499/11

Abstract: The reliability and resilience of a speaker in a portable device may be improved by enabling the device to determine a status of an enclosure of a transducer. The impedance profiles of transducers vary depending on the enclosure status, whether the enclosure is leaky, ported, or sealed. Determination of parameters related to an impedance of a transducer may aid in a determination of the status of the enclosure. Once an enclosure status is determined, that information may be used to determine an excursion model for the transducer. Adapting the excursion model or other audio processing parameters can improve protection and performance of the transducer.

公开(公告)号：US20180160228A1

公开(公告)日：2018-06-07

申请号：US15805901

申请日：2017-11-07

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Rong Hu ,  Roberto Napoli ,  Jie Su

IPC: H04R3/00 ,  H04R29/00

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

Abstract: A speaker model may implement a direct voltage-to-excursion model in an adaptive filter for modeling the speaker without developing a first electrical-only model and then converting the model to a mechanical model. The voltage-to-excursion model may allow for modeling of different kinds of speakers, such as sealed, ported, or vented speakers. A transfer function may be developed in the adaptive filter for the voltage-to-excursion model, and that transfer function re-used for prediction of excursion values based on an audio signal. Speaker protection may be performed to take steps to prevent speaker damage when a predicted excursion value exceeds safe limits. The voltage-to-excursion model may operate in displacement or displacement-related domains (e.g., velocity and back emf).