NOISE REDUCTION DEVICE

• US 20100111317A1
• Filed: 12/11/2008
• Published: 05/06/2010
• Est. Priority Date: 12/14/2007
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Asao, Yoshifumi, Maeda, Tsuyoshi, Kano, Hiroyuki, Higashida, Masaaki, Ezaki, Toshihiro
• Granted Patent: US 9,090,332 B2
• Time in Patent Office: Days
• US Class Current: 381/71.400
• CPC Class Codes: B60R 13/0815 Acoustic or thermal insulation of passenger compartments wall or roof liners integrating the insulating function B60R13/02; insulating floor mats or carpets B60N3/04
• CPC Class Codes: B64C 1/40 Sound or heat insulation , e.g. using insulation blankets
• CPC Class Codes: G10K 11/17853 of the filter
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17861 using additional means for damping sound, e.g. using sound absorbing panels
• CPC Class Codes: G10K 11/17883 the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
• CPC Class Codes: G10K 2210/1281 Aircraft, e.g. spacecraft, airplane or helicopter
• CPC Class Codes: G10K 2210/3221 Headrests, seats or the like, for personal ANC systems
• CPC Class Codes: Y02T 50/40 Weight reduction

Abstract

A noise reduction device, including a microphone for detecting noise, a noise controller for reversing the phase of noise detected by the microphone based on information outputted from the microphone, and a speaker for outputting sound based on information outputted from the noise controller, is arranged at a seat surrounded by a shell portion having a cavity, wherein a speaker is disposed in the cavity of the shell portion.

Claims

1. A noise reduction device comprising:

a noise detecting unit for detecting noise emitted from noise sources;

a noise control unit for generating a control sound signal to reduce noise detected by the noise detecting unit; and

a control sound output unit for outputting a control sound based on the control sound signal from the noise control unit,

wherein the noise reduction device is arranged at a seat surrounded by a shell portion having a cavity, and

the control sound output unit is installed in the cavity of the shell portion.

2. The noise reduction device of claim 1 further comprising:

an error sound detecting unit for detecting by superimposing noise emitted from the noise source on control sound outputted from the control sound output unit.

3. The noise reduction device of claim 1 or claim 2,

wherein the control sound output unit is movably arranged in the cavity of the shell portion.

4. The noise reduction device of claim 3,

wherein the seat is provided with a reclining portion, and the control sound output unit moves in the cavity of the shell portion, interlocking with the reclining portion.