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Machine translation
1. (WO1981001480) IMPROVED METHOD AND APPARATUS FOR CANCELLING VIBRATION
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/001480    International Application No.:    PCT/GB1980/000201
Publication Date: 28.05.1981 International Filing Date: 21.11.1980
IPC:
G10K 11/178 (2006.01)
Applicants:
Inventors:
Priority Data:
8001155 14.01.1980 GB
Title (EN) IMPROVED METHOD AND APPARATUS FOR CANCELLING VIBRATION
(FR) PROCEDE ET APPAREIL AMELIORE DE SUPPRESSION DES VIBRATIONS
Abstract: front page image
(EN)Improved method and apparatus for the nulling of a primary vibration by the "active" method, based on the "virtual earth" system in which the output of a loudspeaker (3') is continually controlled by a feedback loop (1', 2', 3') to maintain a null at a microphone (1') disposed adjacent to the loudspeaker. In accordance with the invention the loop (1', 2', 3') is used as a generator for the correct waveform of the secondary vibration required to null the primary vibration, the amplitude at which the secondary vibration is projected into the primary vibration being increased to move the null point to the far field of the loudspeaker (3').
(FR)Procede et appareil ameliore d'annulation d'une vibration primaire par le procede "actif" base sur le systeme "virtuel a terre" dans lequel la sortie d'un haut-parleur (3, ) est continuellement commandee par une boucle de reaction (1', 2', 3') pour maintenir un zero au niveau d'un microphone (1') dispose adjacent au haut-parleur. La boucle (1', 2', 3') est utilisee comme generateur pour la forme d'onde correcte de la vibration secondaire necessaire pour annuler la vibration primaire, l'amplitude a laquelle la vibration secondaire est projetee dans la vibration primaire etant augmentee pour deplacer le point zero vers le champ eloigne du haut-parleur (3').
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)