Abstract: For active damping of vibration at a location subjected to a primary vibration field, a vibratory wave is generated by adaptive filtering of a reference signal and interferes with the primary field at the location. The residual amplitude of vibration at the location is measured, and filtering is adapted automatically to cancel the residual amplitude as measured. The reference signal is divided into a plurality of individual reference signals that are sine-shaped each containing only one of the plurality of frequencies at which the primary field presents a significant energy, with each individual signal being subjected to a respective adaptive digital filter, and the vibratory wave is generated from the sum of the individual filtered signals. An apparatus for implementing the method comprises n processing paths or channels, each having an actuator driving a digital filter, fed with a sine-shaped signal at a frequency corresponding to a concentration of vibratory energy to be damped.

Abstract: A camera device comprises a first detector having opto-electronic sensors for enabling an entire image to be input simultaneously, and associated with an optical system of long focal length. A second detector is associated with an optical system that gives a large field of view, covering the field of the first detector and extending beyond it. The camera device also includes means for synchronizing the images taken by the two detectors and for recording them.