Active reduction of harmonic noise from multiple noise sources
Номер патента: EP3178084A1
Опубликовано: 14-06-2017
Автор(ы): Alaganandan Ganeshkumar, Dennis D. Klug
Принадлежит: Bose Corp
Опубликовано: 14-06-2017
Автор(ы): Alaganandan Ganeshkumar, Dennis D. Klug
Принадлежит: Bose Corp
Реферат: 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.
Vehicle for controlling noise from road and control method therefor
Номер патента: US20240290315A1. Автор: Dong Hwan Kim,Joo Won Park,Se Yeong Jang. Владелец: Spb Audio Lab Bulgaria Jsc. Дата публикации: 2024-08-29.