公开(公告)号：US10582300B2

公开(公告)日：2020-03-03

申请号：US16006139

申请日：2018-06-12

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ylva Ellen Maria Bjork ,  Erik Vilhelm Lindahl ,  Jason William Lawrence ,  Christopher Ekbom

IPC: H04R3/00 ,  G01K7/16 ,  H04R29/00

Abstract: Methods and Apparatus for estimating a temperature of an electromechanical transducer. The method comprising receiving an audio signal (901); providing an output signal to the electromechanical transducer, based on the audio signal (902); and determining whether a first magnitude of the audio signal in a first frequency band is above a magnitude threshold (903). In response to the first magnitude being above or equal to the magnitude threshold, calculating a first impedance of the electromechanical transducer based on measurements of a first voltage and a first current of the electromechanical transducer within the first frequency band (905), and estimating the temperature of the electromechanical transducer based on the first impedance (907). In response to the first magnitude being below the magnitude threshold, inserting a pilot tone into the audio signal (909), wherein the pilot tone is at a pilot tone frequency, calculating a second impedance of the electromechanical transducer based on measurements of a second voltage and a second current of the electromechanical transducer at the pilot tone frequency (911), and estimating the temperature of the electromechanical transducer based on the second impedance (913).

公开(公告)号：US10123116B2

公开(公告)日：2018-11-06

申请号：US15498831

申请日：2017-04-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ylva Ellen Maria Bjork ,  Erik Vilhelm Lindahl

IPC: H04R3/04 ,  G10L21/038 ,  H04R29/00 ,  H04R3/00 ,  H04R3/08

Abstract: A method for characterizing a loudspeaker comprises: filtering an input test signal by applying the inverse of a linear model describing an excursion of the loudspeaker in response to a given input signal, the linear model containing only linear terms; applying the filtered input test signal to the loudspeaker; measuring the excursion of the loudspeaker in response to the filtered input test signal; and, based on the measured excursion, determining one or more non-linear parameters for a non-linear model describing the excursion of the loudspeaker in response to a given input signal.

公开(公告)号：US10104473B2

公开(公告)日：2018-10-16

申请号：US15498800

申请日：2017-04-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ylva Ellen Maria Bjork ,  Erik Vilhelm Lindahl

IPC: H04R3/04 ,  G10L21/038 ,  H04R3/08 ,  H04R29/00

Abstract: Embodiments of the invention provide methods and apparatus for processing audio input signals, for example, so as to linearize the output of a given loudspeaker. An audio processor is provided, for modifying an audio signal to be provided to a loudspeaker, the audio processor comprising: a first filter stage, for applying to an audio signal a linear model describing an excursion of the loudspeaker in response to a given input signal, the linear model containing only linear terms, and for generating one or more excursion signals; a plurality of second filters for receiving the one or more excursion signals, each of the second filters configured to apply to a respective one of a plurality of frequency bands in the one or more excursion signals the inverse of a model describing an excursion of the loudspeaker in response to a given input signal; and a combiner for combining the outputs of each of the plurality of second filters. At least a first one of the plurality of second filters applies the inverse of a non-linear model describing an excursion of the loudspeaker in response to a given input signal, the non-linear model comprising one or more non-linear parameters.