公开(公告)号：US09942657B2

公开(公告)日：2018-04-10

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: H03G11/00 ,  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.

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：US10206038B2

公开(公告)日：2019-02-12

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 ,  H04R3/04 ,  H04R29/00

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.