Frequency domain noise cancellation with a desired null based acoustic devices, systems, and methods
US9491544B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 2014 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Sep 22, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2410/05
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Frequency domain signal extraction methods and apparatuses include receiving a reference signal, which contains mostly undesired audio and is substantially void of desired audio. The reference signal is decomposed into at least two reference frequency components. Filtering the at least two reference frequency components with at least two adaptive filters to form at least two filtered reference frequency components. The filtered reference frequency components are recombined in an IFFT component, to produce a filtered reference signal. A delayed signal is input to an adder. The delayed signal contains desired audio and undesired audio. The filtered reference signal is subtracted from the delayed signal to form an output signal containing desired audio. The output signal is decomposed into at least two frequency components. The filtering is adapted with the at least two frequency components. The filtering is inhibited intermittently with the at least two adaptive filters to prevent cancellation of the desired audio. In some implementations, frequency sub-bands are employed. In some implementations, an acoustic element with a Cardioid beam pattern is used to acquire the reference signa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.