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。