公开(公告)号：US20220284881A1

公开(公告)日：2022-09-08

申请号：US17751250

申请日：2022-05-23

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kazuhisa KOTEGAWA ,  Mitsuhiro TANI

IPC: G10K11/178

Abstract: An active noise reduction device includes: a reference signal input terminal that receives a reference signal from a reference signal source attached to an automobile; a simulated vibration transfer characteristics filter unit that generates a second signal by correcting, using simulated vibration transfer characteristics, a first signal for outputting, from a loudspeaker attached to the automobile, a sound different from a canceling sound, the simulated vibration transfer characteristics simulating vibration transfer characteristics from the loudspeaker to the reference signal source; a first subtracter that outputs a corrected reference signal obtained by subtracting the second signal generated, from the reference signal received by the reference signal input terminal; and an adaptive filter unit that applies an adaptive filter to the corrected reference signal outputted from the first subtracter to generate a canceling signal to be used to output the canceling sound.

公开(公告)号：US20220223134A1

公开(公告)日：2022-07-14

申请号：US17573079

申请日：2022-01-11

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Mitsuhiro TANI

IPC: G10K11/178

Abstract: An active noise reduction device includes a first adaptive filter, a first filter coefficient updater, and a controller that determines, based on a first parameter of the first adaptive filter, whether first noise control based on a first cancelling sound is in a stable state or an unstable state. The controller transitions the first filter coefficient updater to a restriction state in which an effect of reducing first noise is smaller than in a normal state when it is determined that the first noise control is in the unstable state while the first filter coefficient updater is updating a coefficient of the first adaptive filter in the normal state, and transitions the first filter coefficient updater back to the normal state when it is determined that the first noise control is in the stable state while the first filter coefficient updater is in the restriction state.

公开(公告)号：US20220230617A1

公开(公告)日：2022-07-21

申请号：US17574234

申请日：2022-01-12

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Mitsuhiro TANI

IPC: G10K11/178

Abstract: An active noise reduction device includes: an adaptive filter that generates a cancelling signal by applying an adaptive filter to a reference signal that has a correlation with noise in a space in an automobile, the cancelling signal being used to output a cancelling sound for reducing the noise; and a filter coefficient updater that calculates a coefficient of the adaptive filter based on a predetermined update equation. At a first timing at which the output of the cancelling sound is started, the filter coefficient updater uses a first coefficient as an initial value of the update equation, the first coefficient being the coefficient of the adaptive filter calculated by the filter coefficient updater at a second timing that is prior to the first timing.

公开(公告)号：US20190130890A1

公开(公告)日：2019-05-02

申请号：US16166402

申请日：2018-10-22

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Mitsuhiro TANI

IPC: G10K11/178

CPC classification number: G10K11/17835 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17833 ,  G10K2210/1282 ,  G10K2210/503

Abstract: An active noise control device reduces noise inside a cabin of a car. The active noise control device includes: a controller that decreases a signal level of a canceling signal when a signal level of a received reference signal is lower than a threshold; and a threshold controller that changes the threshold based on at least one of a signal level of an error signal and information on the car.

公开(公告)号：US20240071360A1

公开(公告)日：2024-02-29

申请号：US18232044

申请日：2023-08-09

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Mitsuhiro TANI

IPC: G10K11/178

CPC classification number: G10K11/17879 ,  G10K11/17854

Abstract: An active noise reduction device includes a signal processor that generates a cancelling signal for outputting a cancelling sound for reducing noise in an interior of a vehicle and a communicator that receives a change request for changing a parameter set related to generation of the cancelling signal to a user-designated parameter set that is designated by a user, and the signal processor generates the cancelling signal by using the user-designated parameter set based on the change request received.

公开(公告)号：US20230098125A1

公开(公告)日：2023-03-30

申请号：US17944455

申请日：2022-09-14

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Mitsuhiro TANI ,  Shinnosuke NAGASAWA ,  Fumiyasu KONNO

IPC: B60W50/14 ,  B60W40/04 ,  H04R1/28

Abstract: A vehicle approach notification system includes a filter; a notification sound controller which generates a signal corresponding to a notification sound for notifying of approaching of a vehicle, based on a sound signal obtained from a notification-sound sound source; and a setter which obtains vehicle information of the vehicle, and sets, according to the vehicle information, at least one of the notification-sound sound source to be used in generation of the notification sound, a filter property to be applied to the filter, or a control parameter to be applied to the notification sound controller in generation of the notification sound. The notification sound controller outputs the signal generated, through the filter to an exterior loudspeaker provided to the vehicle.

公开(公告)号：US20220277725A1

公开(公告)日：2022-09-01

申请号：US17745392

申请日：2022-05-16

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Mitsuhiro TANI

IPC: G10K11/178

Abstract: An active noise reduction device reduces noise in a space in an automobile. The active noise reduction device includes: a reference signal input terminal that receives a reference signal outputted by a reference signal source and having a correlation with the noise, the reference signal source being attached to the automobile; a compressor that compresses and outputs the reference signal received by the reference signal input terminal and having an amplitude greater than or equal to a threshold; an adaptive filter unit that applies an adaptive filter to the reference signal outputted from the compressor to generate a canceling signal to be used to output a canceling sound for reducing the noise; and a filter coefficient updater that updates a coefficient of the adaptive filter.

公开(公告)号：US20220215826A1

公开(公告)日：2022-07-07

申请号：US17568373

申请日：2022-01-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Mitsuhiro TANI

IPC: G10K11/178

Abstract: An active noise reduction device includes: a reference signal inputter; an adaptive filter; a μ adjuster that calculates a step size parameter by multiplying a reference value for the step size parameter by a correction coefficient that is proportional to a reciprocal of a first representative input value that indicates a signal level of the reference signal in a first predetermined period; a filter coefficient updater that updates adaptive filter coefficient W by using the step size parameter calculated; and a determiner. When it is determined that a second representative input value is greater than a threshold value, at least one of the adaptive filter or the filter coefficient updater is transitioned from a normal state to a restriction state in which an effect of reducing noise is smaller than in the normal state.