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Active reduction of harmonic noise from multiple noise sources
专利权人:
Bose Corporation
发明人:
Alaganandan Ganeshkumar,Dennis D. Klug
申请号:
US14494852
公开号:
US09344796B2
申请日:
2014.09.24
申请国别(地区):
US
年份:
2016
代理人:
摘要:
A system and method for reducing harmonic noise caused by two or more noise sources by causing one or more loudspeakers to produce sounds that are at about the same frequencies as the noise and of substantially opposite phase. There is a noise canceller associated with each noise source. Each noise canceller includes a harmonic sine wave generator that generates an output sine wave. Each noise canceller also has an adaptive filter that uses a sine wave to create a noise reduction signal that is used to drive one or more transducers with their outputs directed to reduce noise caused by the noise sources. There is an overlap detector that compares the harmonic frequencies and, based on their proximity, alters the operation of one or more adaptive filters.
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