公开(公告)号：US12185067B2

公开(公告)日：2024-12-31

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

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.