Variable bandwidth delayless subband algorithm for broadband active noise control system
US9837065B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Dec 8, 2014 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Jan 10, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3053
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An active noise control (ANC) system includes a speaker and one or more processors programmed to implement a delayless subband filtered-x least mean square control algorithm. The algorithm includes a variable bandwidth discrete Fourier transform filter bank having a number of subbands such that the system, in response to a broadband white noise reference signal indicative of road noise in the vehicle, exhibits a uniform gain spectrum across a frequency range defined by the subbands and partially cancels the road noise via output of the speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.