公开(公告)号：US11644521B1

公开(公告)日：2023-05-09

申请号：US17690327

申请日：2022-03-09

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ryan A. Hellman ,  Viral Parikh ,  Siddharth Maru ,  Tejasvi Das

IPC: G01R27/08 ,  G01R35/00 ,  G01R27/02 ,  G01R27/14 ,  G01R1/20 ,  G01R19/00 ,  G01R27/16

CPC classification number: G01R35/005 ,  G01R1/203 ,  G01R19/0092 ,  G01R27/02 ,  G01R27/14 ,  G01R27/08 ,  G01R27/16

Abstract: Circuitry comprising: a voltage monitoring path; a current monitoring path; a reference element of a predefined impedance; and processing circuitry, wherein in operation of the circuitry in a calibration mode of operation: the voltage monitoring path is operative to output a signal indicative of a voltage across the reference element in response to a reference signal applied to the reference element; the current monitoring path is operative to output a signal indicative of a current through the reference element in response to the reference signal; and the processing circuitry is operative to: receive the signal indicative of the voltage across the reference element and the signal indicative of the current through the reference element; generate an estimate of an impedance of the reference element; and determine a compensation parameter for an element of the circuitry for compensating for a difference between the estimate of the impedance and the predefined impedance of the reference element.

公开(公告)号：US10923097B2

公开(公告)日：2021-02-16

申请号：US16539092

申请日：2019-08-13

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Viral Parikh ,  Jon D. Hendrix ,  Jeffrey D. Alderson ,  Vitaliy Sapozhnykov ,  Nafiseh Erfanian Saeedi ,  Thomas I. Harvey ,  Robert Luke

IPC: G10K11/178 ,  H04M1/02

Abstract: An integrated circuit for implementing at least a portion of a personal audio device may include an output for providing an output signal to a transducer, wherein the output signal includes a pilot signal, a microphone input for receiving a microphone signal from a microphone indicative of an output of the transducer, and a processing circuit. The processing circuit may be configured to implement a pilot signal control to apply an adjustment to the pilot signal as necessary to maintain the pilot signal at a substantially constant magnitude regardless of proximity of the transducer to a pinna and implement a proximity determination block configured to determine proximity of the transducer to the pinna based on the adjustment.

公开(公告)号：US12047757B2

公开(公告)日：2024-07-23

申请号：US17749473

申请日：2022-05-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Viral Parikh ,  Jaiminkumar Mehta ,  Ryan Hellman

IPC: H04R3/04 ,  G01R19/00 ,  G01R23/16 ,  G01R23/165 ,  G01R27/02 ,  G01R27/08 ,  H03F1/34 ,  H03F3/183 ,  H03F3/217 ,  H04R3/00 ,  H04R3/08 ,  H04R9/02 ,  H04R9/06 ,  H04R29/00

CPC classification number: H04R3/04 ,  G01R19/0007 ,  G01R23/16 ,  G01R23/165 ,  G01R27/02 ,  G01R27/08 ,  H03F1/34 ,  H03F3/183 ,  H03F3/217 ,  H04R3/002 ,  H04R3/08 ,  H04R9/02 ,  H04R9/06 ,  H04R29/001 ,  H04R2400/13

Abstract: A method may include measuring a physical quantity associated with a load driven by an amplifier, generating a windowing function having a variable length and based on a number of samples of the physical quantity to be processed, applying the windowing function to the physical quantity, performing a transform on the physical quantity as filtered by the windowing function, and determining a characteristic of the load based on the transform.