公开(公告)号：US20230154482A1

公开(公告)日：2023-05-18

申请号：US17973651

申请日：2022-10-26

Applicant: Alps Alpine Co., LTD.

Inventor： Nozomu SAITO ,  Keita TANNO

IPC: G10L21/0232 ,  H04R1/26

CPC classification number: G10L21/0232 ,  H04R1/26 ,  H04R2499/13 ,  G10L2021/02166

Abstract: A voice output from an i-th audio source apparatus is adjusted with a frequency transfer function Wii(f) set in an i-th noise reduction filter and is output from an i-th speaker. In the noise reduction filter, a frequency transfer function Wii(f) is set in which the sound is made smaller at frequencies where the gain of the frequency transfer function Cim(f) from the SPKi to a user tends to be relatively larger than the gain of the frequency transfer function Cii(f) from the SPKi to the user, and the sound is increased at frequencies where the gain of Cim(f) tends to be relatively smaller than the gain of Cii(f), where m is an integer excluding i from 1 to n.

公开(公告)号：US20230410783A1

公开(公告)日：2023-12-21

申请号：US18196008

申请日：2023-05-11

Applicant: Alps Alpine Co., LTD.

Inventor： Ryosuke TACHI ,  Keita TANNO

IPC: G10K11/178

CPC classification number: G10K11/17825 ,  G10K11/17881 ,  G10K11/17823 ,  G10K2210/3046 ,  G10K2210/3026 ,  G10K2210/3055 ,  G10K2210/3056 ,  G10K2210/3044 ,  G10K2210/1282 ,  G10K2210/3027 ,  G10K2210/3028

Abstract: An active noise control system includes an error adder that generates an error signal by adding an output of a left-seat left microphone and an output of a left-seat right microphone, an adaptive filter that generates a noise canceling sound from a reference signal by performing an adaptive operation using the reference signal and the error signal, a left channel gain adjustment section that adjusts a gain of the noise canceling sound to be output to a left-seat left speaker, and a right channel gain adjustment section that adjusts a gain of the noise canceling sound to be output to the left-seat right speaker. A ratio between the gains of the left channel gain adjustment section and the right channel gain adjustment section matches a ratio between loudness levels of noise transmitted to the output of the left-seat left microphone and the output of the left-seat right microphone.

公开(公告)号：US20230379651A1

公开(公告)日：2023-11-23

申请号：US18143164

申请日：2023-05-04

Applicant: ALPS ALPINE CO., LTD.

Inventor： Keita TANNO ,  Osamu SHINOHARA

IPC: H04S7/00 ,  H04R3/12

CPC classification number: H04S7/307 ,  H04S7/302 ,  H04R3/12 ,  H04R2499/13

Abstract: A sound output by an i-th audio source device is adjusted by an i-th sound leakage reduction filter with a frequency transfer function set in the i-th sound leakage reduction filter and is output from an i-th speaker toward a user. The frequency transfer function relatively reduces the volume of the sound at a frequency where a first gain of a frequency transfer function from the speaker to one or multiple predetermined sound leakage reference positions outside the vehicle tends to be high relative to a second gain of a frequency transfer function from the speaker to the user, and relatively increases the volume of the sound at a frequency where the first gain tends to be low relative to the second gain.