Active noise control system
AssigneesNitto Denko Corporation, The School Corporation Kansai University
InventorsKohei OTO, Yoshinobu KAJIKAWA, Ryosuke OKAJIMA
Life of this patent
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Abstract
An active noise control system (500) includes a structure (80), a first piezoelectric speaker (10A), and a second piezoelectric speaker (10B). The structure (80) has a front surface (80a) and a back surface (80b). The first piezoelectric speaker (10A) is disposed on the front surface (80a). The first piezoelectric speaker (10A) is configured to radiate a sound wave for sound reduction. The second piezoelectric speaker (10B) is disposed on the back surface (80b). The second piezoelectric speaker (10B) is configured to radiate a sound wave for sound reduction.
Claims11
An active noise control system comprising:
- a structure having a front surface and a back surface;
- a first piezoelectric speaker disposed on the front surface and configured to radiate a sound wave for sound reduction;
- and
- a second piezoelectric speaker disposed on the back surface and configured to radiate a sound wave for sound reduction.
An active noise control system comprising:
- a structure having a front surface and a back surface;
- a first piezoelectric speaker disposed on the front surface and configured to radiate a sound wave for sound reduction;
- a first reference microphone;
- and
- a controller, wherein
- a front space overlapping the front surface in plan view of the front surface, the front surface, the back surface, and a back space overlapping the back surface in plan view of the back surface are arranged in this order,
- the first reference microphone is disposed in the back space, and
- the controller controls, for sound reduction in the front space, sound to be output from the first piezoelectric speaker without use of an error microphone positioned in the front space and with use of the first reference microphone.
An active noise control system comprising:
- a structure having a front surface and a back surface;
- a first piezoelectric speaker disposed on the front surface and configured to radiate a sound wave for sound reduction;
- a first reference microphone;
- and
- a controller, wherein
- a front space overlapping the front surface in plan view of the front surface, the front surface, the back surface, and a back space overlapping the back surface in plan view of the back surface are arranged in this order,
- the first reference microphone is disposed in the back space, and
- the controller controls, for sound reduction in the front space, sound to be output from the first piezoelectric speaker with use of the first reference microphone, and
- when sound output from the first piezoelectric speaker and input to the first reference microphone is defined as a first travel-around sound,
- the controller does not perform feedback compensation that is for reducing an influence of the first travel-around sound on sound to be output from the first piezoelectric speaker.
Dependencies are inferred from the claim text.