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Machine translation
1. (WO1981000638) A METHOD OF REDUCING THE ADAPTION TIME IN THE CANCELLATION OF REPETITIVE VIBRATION
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000638    International Application No.:    PCT/GB1980/000128
Publication Date: 05.03.1981 International Filing Date: 15.08.1980
IPC:
F01N 1/06 (2006.01), G10K 11/178 (2006.01), F02B 1/04 (2006.01)
Applicants:
Inventors:
Priority Data:
7928570 16.08.1979 GB
Title (EN) A METHOD OF REDUCING THE ADAPTION TIME IN THE CANCELLATION OF REPETITIVE VIBRATION
(FR) METHODE DE REDUCTION DU TEMPS D'ADAPTATION POUR L'ANNULATION DE VIBRATIONS REPETITIVES
Abstract: front page image
(EN)A method of reducing the adaption time needed to adapt a synthetically generated secondary waveform so that it nulls a primary repetitive waveform (e.g. noise) from a source (1) of vibration, the secondary waveform generation (5) being synchronised by the source (1). The polarity and/or the amplitude of at least a part of the signal resulting from interaction between the primary and secondary waveforms is sensed (6) and used (7, 8) to reshape the secondary waveform. The invention finds application in the cancelling of repetitive vibrations (e.g. in quietening the driving cab of a vehicle).
(FR)Methode de reduction du temps d'adaptation necessaire pour adapter une forme d'onde secondaire engendree synthetiquement pour qu'elle annule une forme d'onde primaire repetitive (p. ex. le bruit) d'une source (1) de vibrations, la production (5) de la forme d'onde secondaire etant synchronisee par la source (1). La polarite et/ou l'amplitude d'au moins une partie du signal resultant de l'interaction entre les formes d'onde primaire et secondaire est detectee (6) et utilisee (7, 8) pour reformer l'onde secondaire. Application a l'annulation de vibrations repetitives (p. ex. reduction du bruit d'une cabine d'un vehicule).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)