公开(公告)号：US20230147894A1

公开(公告)日：2023-05-11

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: G01R35/00 ,  G01R27/02

CPC classification number: G01R35/005 ,  G01R27/02

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：US20170133000A1

公开(公告)日：2017-05-11

申请号：US15337223

申请日：2016-10-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jon D. HENDRIX ,  Jeffrey D. ALDERSON ,  Chin Huang YONG ,  Ryan A. HELLMAN

IPC: G10K11/178

CPC classification number: G10K11/17833 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3056 ,  G10K2210/506 ,  H04R1/1083 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01

Abstract: An integrated circuit may include an output for providing an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer, an ambient microphone input for receiving an ambient microphone signal indicative of the ambient audio sounds; an error microphone input for receiving an error microphone signal indicative of the output of the transducer and the ambient audio sounds at the transducer; and a processing circuit that implements a feedback path having a feedback response that generates a feedback anti-noise signal from the error microphone signal, wherein a signal gain of the feedback path is a function of the ambient microphone signal, and wherein the anti-noise signal comprises at least the feedback anti-noise signal.