公开(公告)号：US20240365034A1

公开(公告)日：2024-10-31

申请号：US18643261

申请日：2024-04-23

Applicant: ALPS ALPINE CO., LTD.

Inventor： Ryosuke TACHI ,  Ryo ITO

IPC: H04R1/02 ,  H04R1/34

CPC classification number: H04R1/023 ,  H04R1/345 ,  H04R2217/03 ,  H04R2499/13

Abstract: A speaker that is configured to emit ultrasonic waves includes an ultrasonic emission unit, a reflector, and a louver unit. The ultrasonic emission unit is configured to emit ultrasonic waves in an emission direction. The reflector is disposed at a side of the ultrasonic emission unit from which the ultrasonic waves are emitted. The reflector is configured to reflect the ultrasonic waves emitted from the ultrasonic emission unit in a predetermined direction. The louver unit is disposed between the ultrasonic emission unit and the reflector. The louver unit includes slits formed therein in a manner such that the slits do not change a direction of the ultrasonic waves between the ultrasonic emission unit and the reflector, and do not change a direction of the ultrasonic waves reflected by the reflector. The louver unit is configured to inhibit entry of foreign matter into the ultrasonic emission unit.

公开(公告)号：US20220312135A1

公开(公告)日：2022-09-29

申请号：US17656026

申请日：2022-03-23

Applicant: ALPS ALPINE CO., LTD.

Inventor： Ryosuke TACHI ,  Masashi KANEKO ,  Tadashi SAKASHITA ,  Arata TADA

IPC: H04R29/00 ,  H04R9/02 ,  H04R9/06 ,  H04R7/12 ,  H04R9/04

Abstract: A speaker includes a yoke configured to form a magnetic circuit, a first magnet provided in a fixed manner, a voice coil provided in a gap through which a magnetic flux of the magnetic circuit is configured to pass, a diaphragm connected to the voice coil and configured to vibrate with the voice coil, a second magnet provided on a diaphragm unit including the voice coil and the diaphragm, and a magnetic sensor provided at a position through which both of a first magnetic flux generated by the first magnet and a second magnetic flux generated by the second magnet are configured to pass, wherein a direction of the first magnetic flux and a direction of the second magnetic flux are different from each other.

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：US20230274723A1

公开(公告)日：2023-08-31

申请号：US18113225

申请日：2023-02-23

Applicant: Alps Alpine Co., LTD.

Inventor： Ryosuke TACHI

IPC: G10K11/178 ,  B60N2/005 ,  B60N2/90

CPC classification number: G10K11/17817 ,  B60N2/005 ,  B60N2/90 ,  G10K11/17815 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17881 ,  G10K2210/1282 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3044 ,  G10K2210/3046 ,  G10K2210/3055 ,  G10K2210/505

Abstract: A noise canceling adaptive filter outputs, from a front seat speaker, a noise canceling sound generated by applying a transfer function X(z) adapted by an adaptive operation using an output of a front seat microphone as an error to an output sound of a sound source apparatus. An output of the front seat microphone is added to an output of an audio feedback canceling filter by a second adder, added to an output sound of the sound source apparatus by a third adder, and output from a rear seat speaker. The audio feedback canceling filter applies a transfer function X′(z) and a transfer function C^(z) on an output of the second adder and outputs a resultant. The transfer function C^(z) corresponds to a transfer function C(z) from the front seat speaker to the front seat microphone. In synchronization control, the transfer function X(z) is set as the transfer function X′(z).

公开(公告)号：US20230396922A1

公开(公告)日：2023-12-07

申请号：US18196014

申请日：2023-05-11

Applicant: Alps Alpine Co., LTD.

Inventor： Ryosuke TACHI

IPC: H04R3/04 ,  H04R1/10 ,  G10K11/178

CPC classification number: H04R3/04 ,  H04R1/1083 ,  G10K11/17854

Abstract: An assist band is set to a standard band when there is no large road noise, and is set to a treble band not including a low frequency band but including a high frequency band as compared with the standard band when there is a large road noise. In audio data of a front seat microphone, components outside the assist band are cut by an IIR filter, downsampled by a downsampling unit to a sampling frequency that is twice the upper limit of the assist band, processed by an echo canceller and a howling canceller, upsampled by an upsampling unit, and output to a rear seat speaker. When there is a large road noise, the operation of the howling canceller is invalidated, and the input is output as it is.

公开(公告)号：US20230292044A1

公开(公告)日：2023-09-14

申请号：US18113238

申请日：2023-02-23

Applicant: Alps Alpine Co., LTD.

Inventor： Ryosuke TACHI

IPC: H04R3/04

CPC classification number: H04R3/04

Abstract: One form of an audio signal processing apparatus adds a low-frequency sound sensation enhancement signal for enhancing a low-frequency sound sensation of an audio source signal to the audio source signal output by an audio source device, and outputs a resultant signal to a loudspeaker. The audio signal processing apparatus generates the low-frequency sound sensation enhancement signal with a frequency range from f0 to f1 (where f0

公开(公告)号：US20230140328A1

公开(公告)日：2023-05-04

申请号：US17977078

申请日：2022-10-31

Applicant: Alps Alpine Co., LTD.

Inventor： Ryosuke TACHI

IPC: H04R1/32 ,  H04R5/04

Abstract: A magnetic angle sensor outputs a component Vs in a Y direction where a vibration system of a synthetic vector of a magnetic vector of a magnetic circuit of a speaker and a magnetic vector of a displacement detection magnet fixed on the vibration system and a component Vc in an X direction orthogonal to the Y direction. A test signal is applied to the speaker, and collection of (Vs, Vc) and a measurement of a Y-direction displacement of the vibration system by a displacement meter are performed. A conversion equation “z=a1xVs+a2xVc” for the first principle component is obtained by principle component analysis on collected (Vs, Vc), and a conversion equation “y=b1xz2+b2xz+b3” for conversion to a displacement y is obtained by polynomial regression on the Y-direction displacement y of the displacement detection magnet obtained from a measurement value of the displacement meter and z calculated from collected (Vs, Vc).