公开(公告)号：US12154536B2

公开(公告)日：2024-11-26

申请号：US17978239

申请日：2022-11-01

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi ,  Shih-Kai He

IPC: G10K11/178

Abstract: An active noise control (ANC) circuit is used for generating an anti-noise signal, and has a plurality of filters including at least one first filter and at least one second filter. The at least one first filter generates at least one first filter output, wherein each of the at least one first filter has a first filter type. The at least one second filter generates at least one second filter output, wherein each of the at least one second filter has a second filter type different from the first filter type. The anti-noise signal is jointly controlled by the at least one first filter output and the at least one second filter output. The at least one first filter and the at least one second filter are connected in a parallel fashion.

公开(公告)号：US11875772B2

公开(公告)日：2024-01-16

申请号：US17697919

申请日：2022-03-17

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi

IPC: G10K11/178

CPC classification number: G10K11/17854 ,  G10K11/1783 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17881 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3044

Abstract: An adaptive active noise control (ANC) system includes an ANC circuit and a control circuit. The ANC circuit generates an anti-noise signal, and includes at least one adaptive filter. The control circuit receives a first input signal derived from a reference signal output by a reference microphone that picks up ambient noise, receives a second input signal derived from an error signal output by an error microphone that picks up remnant noise resulting from noise reduction, and performs a comparison operation based on a first characteristic value of the first input signal and a second characteristic value of the second input signal to control the at least one adaptive filter.

公开(公告)号：US20230335100A1

公开(公告)日：2023-10-19

申请号：US17978239

申请日：2022-11-01

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi ,  Shih-Kai He

IPC: G10K11/178

CPC classification number: G10K11/17815 ,  G10K11/17881 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17817 ,  G10K2210/3044 ,  G10K2210/3028 ,  G10K2210/3027 ,  G10K2210/3026 ,  G10K2210/30232 ,  G10K2210/1081

Abstract: An active noise control (ANC) circuit is used for generating an anti-noise signal, and has a plurality of filters including at least one first filter and at least one second filter. The at least one first filter generates at least one first filter output, wherein each of the at least one first filter has a first filter type. The at least one second filter generates at least one second filter output, wherein each of the at least one second filter has a second filter type different from the first filter type. The anti-noise signal is jointly controlled by the at least one first filter output and the at least one second filter output. The at least one first filter and the at least one second filter are connected in a parallel fashion.

公开(公告)号：US11955108B2

公开(公告)日：2024-04-09

申请号：US17689436

申请日：2022-03-08

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/17881 ,  G10K11/17854 ,  H04R1/1083 ,  G10K2210/1081

Abstract: The invention relates to an adaptive active noise cancellation apparatus and an audio playback system using the same. The adaptive active noise cancellation apparatus shapes an error signal and a noise signal according to a shape of an ideal noise. After that, the shaped noise signal and the shaped error signal are sent into a parameter adjusting unit to perform an adaptive parameter adjustment. Thus, the adaptive noise filter unit is not only can adaptively suppress noise and minimize the error signal, but also can suppress specific frequencies that are sensitive to the human ear.

公开(公告)号：US11942068B2

公开(公告)日：2024-03-26

申请号：US17696901

申请日：2022-03-17

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi

IPC: G10K11/178

CPC classification number: G10K11/17854 ,  G10K11/17815 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17881 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3044

Abstract: An adaptive active noise control (ANC) system includes an ANC circuit and a control circuit. The ANC circuit generates an anti-noise signal for noise reduction, wherein the ANC circuit includes at least one adaptive filter. The control circuit receives a first input signal derived from a reference signal output by a reference microphone that picks up ambient noise, receives a second input signal derived from an error signal output by an error microphone that picks up remnant noise resulting from the noise reduction, and performs a transfer function variation detection based on the first input signal and the second input signal to control the at least one adaptive filter.

公开(公告)号：US20230298560A1

公开(公告)日：2023-09-21

申请号：US17697919

申请日：2022-03-17

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi

IPC: G10K11/178

CPC classification number: G10K11/17854 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17881 ,  G10K11/1783 ,  G10K2210/3044 ,  G10K2210/3028 ,  G10K2210/3027 ,  G10K2210/3026

Abstract: An adaptive active noise control (ANC) system includes an ANC circuit and a control circuit. The ANC circuit generates an anti-noise signal, and includes at least one adaptive filter. The control circuit receives a first input signal derived from a reference signal output by a reference microphone that picks up ambient noise, receives a second input signal derived from an error signal output by an error microphone that picks up remnant noise resulting from noise reduction, and performs a comparison operation based on a first characteristic value of the first input signal and a second characteristic value of the second input signal to control the at least one adaptive filter.

公开(公告)号：US20240112665A1

公开(公告)日：2024-04-04

申请号：US18199972

申请日：2023-05-21

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi ,  Shih-Kai He

IPC: G10K11/178

CPC classification number: G10K11/17823 ,  G10K11/17825 ,  G10K11/17881 ,  G10K11/17815 ,  G10K11/17817 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3044 ,  G10K2210/3055

Abstract: An active noise control (ANC) circuit is used for generating an anti-noise signal, and has a plurality of filters including at least one first filter and at least one second filter. The at least one first filter generates at least one first filter output, wherein each of the at least one first filter has at least one non-static filter and at least one static filter connected in a series fashion. The at least one second filter generates at least one second filter output, wherein each of the at least one second filter has at least one adaptive filter. The anti-noise signal is jointly controlled by the at least one first filter output and the at least one second filter output. The at least one first filter and the at least one second filter are connected in a parallel fashion.

公开(公告)号：US20230298559A1

公开(公告)日：2023-09-21

申请号：US17696901

申请日：2022-03-17

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi

IPC: G10K11/178

CPC classification number: G10K11/17854 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17881 ,  G10K11/17815 ,  G10K2210/3044 ,  G10K2210/3028 ,  G10K2210/3027 ,  G10K2210/3026

Abstract: An adaptive active noise control (ANC) system includes an ANC circuit and a control circuit. The ANC circuit generates an anti-noise signal for noise reduction, wherein the ANC circuit includes at least one adaptive filter. The control circuit receives a first input signal derived from a reference signal output by a reference microphone that picks up ambient noise, receives a second input signal derived from an error signal output by an error microphone that picks up remnant noise resulting from the noise reduction, and performs a transfer function variation detection based on the first input signal and the second input signal to control the at least one adaptive filter.

公开(公告)号：US20230335104A1

公开(公告)日：2023-10-19

申请号：US18211288

申请日：2023-06-19

Applicant: Airoha Technology Corp.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi ,  Kai-Sheng Chen

IPC: G10K11/178

CPC classification number: G10K11/17853 ,  G10K11/17881 ,  G10K2210/1081

Abstract: The present invention relates to an active noise cancellation integrated circuit for stacking at least one anti-noise signal and at least one non-anti-noise signal, an associated method, and an active noise cancellation headphone using the same. The method is applicable to an audio playback device with at least one ANC filtering unit and at least one non-ANC filtering unit. The method includes: acquiring a non-anti-noise signal from a non-ANC filtering unit; generating a decoupled signal by processing the non-anti-noise signal with the transfer function of a physical channel and operations of an ANC filtering unit; performing a signal superposition, wherein an anti-noise signal from the ANC filtering unit is superposed with the decoupled signal; and performing an audio playback based on the superposed signal and an audio signal such that noise is eliminated.

公开(公告)号：US11721315B2

公开(公告)日：2023-08-08

申请号：US17699631

申请日：2022-03-21

Applicant: AIROHA TECHNOLOGY CORP.

Inventor： Chao-Ling Hsu ,  Li-Wen Chi ,  Kai-Sheng Chen

IPC: G10K11/178

CPC classification number: G10K11/17853 ,  G10K11/17825 ,  G10K11/17881

Abstract: The present invention relates to an active noise cancellation integrated circuit for stacking multiple anti-noise signals, an associated method, and an active noise cancellation headphone using the same. The method is applicable to an audio playback device with multiple ANC filtering units. The method includes: acquiring an anti-noise signal from an ANC filtering unit; generating a decoupled signal by processing the anti-noise signal with the transfer function of a physical channel and operations of other ANC filtering units; performing a signal superposition, wherein an anti-noise signal from another ANC filtering unit is superposed with the decoupled signal; and performing an audio playback based on the superposed signal and an audio signal such that noise is eliminated.