The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2018
Filed:
Jun. 20, 2016
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Jason William Lawrence, Austin, TX (US);
Roger David Serwy, Austin, TX (US);
Roberto Napoli, Edinburgh, GB;
Cirrus Logic, Inc., Austin, TX (US);
Abstract
This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system () receives a digital audio signal comprising a plurality of samples at an input node (IN). A delay block () delays the digital audio signal and a gain block () applies a controlled gain to the delayed digital audio signal. An excursion predictor () 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 () 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 () is configured to determine at least one gain setting {gg} to be applied to a set of samples {V. . . V} 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.