公开(公告)号：US20230421951A1

公开(公告)日：2023-12-28

申请号：US17847319

申请日：2022-06-23

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Dayong ZHOU ,  Brad ZWERNEMANN ,  Kaichow LAU ,  Dana J. TAIPALE ,  John L. MELANSON

IPC: H04R3/02

CPC classification number: H04R3/02

Abstract: Circuitry for acoustic crosstalk cancellation between first and second acoustic signals, the circuitry comprising: crosstalk cancellation circuitry configured to: receive a first audio signal and, based on the received first audio signal, generate a first crosstalk cancellation signal; receive a second audio signal and, based on the received second audio signal, generate a second crosstalk cancellation signal; combine the first crosstalk cancellation signal with a signal indicative of the second audio signal to generate a first crosstalk cancellation circuitry output signal; and combine the second crosstalk cancellation signal with a signal indicative of the first audio signal to generate a second crosstalk cancellation circuitry output signal; and output stage circuitry configured to: receive the first crosstalk cancellation circuitry output signal and, based on the received first crosstalk cancellation circuitry, generate a first drive signal for driving a first speaker to generate the first acoustic signal; and receive the second crosstalk cancellation circuitry output signal and, based on the received second crosstalk cancellation circuitry, generate a second drive signal for driving a second speaker to generate the second acoustic signal, wherein a parameter of the crosstalk cancellation circuitry is variable based on one or more of: a position of a user of a host device incorporating the circuitry with respect to the host device; a volume setting of the host device; a level of the first and/or second crosstalk cancellation signal; and an operational parameter of the output stage circuitry.

公开(公告)号：US20220303673A1

公开(公告)日：2022-09-22

申请号：US17205352

申请日：2021-03-18

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Dayong ZHOU ,  Brad ZWERNEMANN

IPC: H04R1/40 ,  G06F17/14 ,  H04R3/00 ,  H04R29/00

Abstract: A method of obtaining a directional microphone signal, the method comprising: receiving first and second microphone signals from first and second microphones separated by a distance; obtaining a combined microphone signal based on one or more of the first and second microphone signals; obtaining a difference microphone signal by subtracting the second microphone signal from the first microphone signal; obtaining a transformed combined microphone signal by applying a Hilbert transform to the combined microphone signal; combining the transformed combined microphone signal with the difference microphone signal to obtain the directional microphone signal.

公开(公告)号：US20200348249A1

公开(公告)日：2020-11-05

申请号：US16842482

申请日：2020-04-07

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Emmanuel MARCHAIS ,  Carl Lennart STÅHL ,  Eric LINDEMANN ,  Jason W. LAWRENCE ,  Dayong ZHOU

IPC: G01N25/18 ,  G01R27/16

Abstract: A method for determining a direct current impedance of a transducer may include receiving an input signal indicative of an electrical power consumed by the transducer and calculating, by a thermal model of the transducer, the direct current impedance based on the electrical power.

公开(公告)号：US20190103090A1

公开(公告)日：2019-04-04

申请号：US15720407

申请日：2017-09-29

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Sang-Ik CHO ,  Dayong ZHOU

IPC: G10K11/178

Abstract: An integrated circuit for implementing at least a portion of a personal audio device may include a processing circuit to implement an adaptive filter having a response that generates an anti-noise signal to reduce the presence of the ambient audio sounds at an error microphone, implement a coefficient control block that shapes the response of the adaptive filter in conformity with the error microphone signal by computing coefficients that determine the response of the adaptive filter to minimize the ambient audio sounds at the error microphone, and responsive to detecting a condition that triggers a reset of the adaptive filter, increment the coefficients in a plurality of steps from initial values of the coefficients at a time of triggering the reset to final values of the coefficients at a conclusion of the reset.