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A filter apparatus for actively reducing noise
Berkhoff, Arthur Perry and Nijsse, Gerard (2007) A filter apparatus for actively reducing noise. Patent.
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| PDF (WO2007064203 (A1)) 1015Kb |
| Abstract: | A filter apparatus for reducing noise from a primary noise source, comprising a secondary source signal connector for generating secondary noise to reduce said primary noise and a sensor connector for connecting to a sensor for measuring said primary and secondary noise as an error signal. A first control filter is arranged to receive a reference signal and calculate a control signal for the secondary source signal. A second control filter is arranged to receive a delayed reference signal and calculate an auxiliary control signal; wherein an adaptation circuit is arranged to adapt said second control filter while receiving an error signal as a sum of the auxiliary control signal and an auxiliary noise signal. The auxiliary noise signal is constructed from a difference of the delayed filtered error signal and a delayed control signal. The first control filter is updated by a copy of said updated second control filter. |
| Item Type: | Patent |
| Faculty: | Electrical Engineering, Mathematics and Computer Science (EEMCS) |
| Research Group: | |
| Link to this item: | http://purl.utwente.nl/publications/64784 |
| Official URL: | http://v3.espacenet.com/textdoc?IDX=WO2007064203 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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