Title:
ACTIVE NOISE CONTROL METHOD, ACTIVE NOISE CONTROL DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2024/047691
Kind Code:
A1
Abstract:
This invention seeks to improve noise control performance even in bands where there is little suppression of noise with conventional active noise control. A reference microphone 10 detects noise x(n) of a noise source N. A noise prediction unit 20 takes the noise x(n) as input, and predicts the noise that will propagate through a primary path P and reach a specific location Z (noise x'(n)). A noise control filter 30 uses the noise x'(n) and a coefficient K to generate canceling sound y(n). A secondary sound source 40 emits the canceling sound y(n). A secondary path model 50 takes the noise x'(n) as input, and estimates the noise that will propagate through a secondary path S and reach the specific location Z (noise x''(n)). An error microphone 60 detects interference sound e(n) composed of noise d(n) and noise d'(n). A coefficient update unit 70 takes the estimated noise x''(n) and the interference sound e(n) as inputs, and updates the coefficient K.
Inventors:
MURATA SHIN (JP)
KAMADO NORIYOSHI (JP)
ITO HIROAKI (JP)
KAMADO NORIYOSHI (JP)
ITO HIROAKI (JP)
Application Number:
PCT/JP2022/032366
Publication Date:
March 07, 2024
Filing Date:
August 29, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G10K11/178
Foreign References:
| JPH10171465A | 1998-06-26 | |||
| JP2018036327A | 2018-03-08 | |||
| JP2017161633A | 2017-09-14 |
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
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