公开(公告)号：US20220293080A1

公开(公告)日：2022-09-15

申请号：US17689327

申请日：2022-03-08

Applicant: Alps Alpine Co., LTD

Inventor： Ryosuke Tachi

IPC: G10K11/178 ,  G10L21/0208 ,  H04R3/00 ,  H04R1/40 ,  G10L25/84

Abstract: In some implementations, an output of a first channel of an echo cancellation variable filter having an output of a first microphone output from a second speaker as an input is added to an output of a second microphone. An echo cancellation coefficient updating unit updates the filter coefficient of the first channel so that the error that is the output of a second adder is minimized. Using the output of the second channel that uses the output of a sound source device output from the first speaker as an input and shares the filter coefficient with the first channel as a reference signal, and the output of the second microphone as an error, the noise cancellation coefficient updating unit updates the filter coefficient of the noise cancellation variable filter that generates a noise-canceling sound to be output from the output of the sound source device to the second speaker.

公开(公告)号：US20220007109A1

公开(公告)日：2022-01-06

申请号：US17363228

申请日：2021-06-30

Applicant: ALPS ALPINE CO., LTD. ,  A School Corporation Kansai University

Inventor： Ryosuke Tachi ,  Yoshinobu Kajikawa

IPC: H04R3/04 ,  H04R3/12 ,  H04R3/00 ,  H04R5/04 ,  H04S7/00 ,  B60R11/02

Abstract: Adaptive operations of a first noise control system and a second noise control system may include a speaker that outputs noise cancellation sound, a microphone that detects an error signal, an auxiliary filter that generates, from a noise signal, a correction signal that corrects the error signal so that a difference in a position between the microphone and a noise cancellation position is compensated, and an adaptive filter that performs an adaptive operation using the corrected error signal to generate the noise cancellation sound from the noise signal are alternately performed. A transfer function learned in a state in which the second noise control system is stopped is set in the auxiliary filter of the first noise control system, and a transfer function learned in a state in which the adaptive operation of the first noise control system is stopped is set in the auxiliary filter of the second noise control system.

公开(公告)号：US20220005453A1

公开(公告)日：2022-01-06

申请号：US17362413

申请日：2021-06-29

Applicant: ALPS ALPINE CO., LTD. ,  A School Corporation Kansai University

Inventor： Ryosuke Tachi ,  Yuji Saito ,  Yoshinobu Kajikawa

IPC: G10K11/178

Abstract: In a first system signal processing unit, a first system auxiliary filter generates a correction signal for correcting an error signal from a noise signal, a first system subtractor subtracts the correction signal from an output of a first microphone to obtain an error signal, an adaptive filter performs an adaptive operation using the error signal to generate a cancel sound output from a first speaker, and a DMS detects a position of a user's ear. When the position of the user's ear moves, the controller stops the adaptive operation, updates the transfer function of the first system auxiliary filter to the transfer function corresponding to the noise cancel position matching the position of the user's ear, gradually changes the transfer function of the adaptive filter to the transfer function corresponding to the matching noise cancel position, and resumes the adaptive operation after the change is completed.

公开(公告)号：US20220005452A1

公开(公告)日：2022-01-06

申请号：US17361979

申请日：2021-06-29

Applicant: ALPS ALPINE CO., LTD. ,  A School Corporation Kansai University

Inventor： Ryosuke Tachi ,  Yoshinobu Kajikawa

IPC: G10K11/178 ,  H04R3/00

Abstract: A first variable filter receives a sound of a second seat audio source as an input and generates a cancel sound for canceling the sound of the second seat audio source at a first seat. The transfer functions of the first variable filter and the second variable filter are updated such that the level of a signal obtained by subtracting the output of the auxiliary filter that generates a correction signal for correcting the difference between the positions of the first seat microphone and the first seat and the output of the second variable filter that receives the sound of the first seat audio source from the output of the first seat microphone is minimized. While the level of the signal exceeds a threshold, the signal is relayed to the second seat as a spoken voice.

公开(公告)号：US20220005450A1

公开(公告)日：2022-01-06

申请号：US17362287

申请日：2021-06-29

Applicant: ALPS ALPINE CO., LTD. ,  A School Corporation Kansai University

Inventor： Ryosuke Tachi ,  Yoshinobu Kajikawa

IPC: G10K11/178

Abstract: In a first system signal processing unit, an adaptive filter generates a noise cancel sound, a first system selector selects an output of a first system auxiliary filter corresponding to a noise cancel position matching a detected position of a right ear of a user from a plurality of first system auxiliary filters corresponding to different noise cancel positions, and a first system subtractor subtracts the selected output from an output of a first microphone and outputs the subtracted result as an error signal to a first system adaptive filter and a second system adaptive filter of a second system signal processing unit. The noise cancel positions are arranged at predetermined intervals in a space where the user can move the right ear due to turning and side bending of the head within a predetermined range in the up-down and front-back directions.