公开(公告)号：US20230379624A1

公开(公告)日：2023-11-23

申请号：US17750271

申请日：2022-05-20

Applicant: Apple Inc.

Inventor： Thomas M. JENSEN ,  Andrew P. BRIGHT ,  Ariel A. MASSIAS ,  Ethan R. DUNI ,  Hannes BREITSCHAEDEL ,  Max RASMUSSEN

IPC: H04R3/00 ,  H04R29/00

CPC classification number: H04R3/007 ,  H04R29/001

Abstract: Aspects of the subject technology relate to electronic devices having speakers. An electronic device may include speaker control circuitry for a speaker. The speaker control circuitry may include multiple parallel prediction blocks that share a single look-ahead delay, and that feed, in parallel, a single controller. The single controller can generate a joint modification to an audio signal based on the parallel outputs of the prediction blocks. The joint modification can then be applied to the audio signal to generate a speaker-protection audio signal that can be output by the speaker. The speaker control circuitry may also include a system modeler that models the speaker system of the electronic device based on feedback measured physical characteristics. In this way, a reduced control safety margin can be achieved by more accurate model predictors, which can allow the controller to safely drive the speaker system to its full capability.