Abstract: An electrostatic-shutter image tube (10) has a shutter electrode (17) disposed between an electron source (12) and a focusing and accelerating electrode (13). An electron flow is propagated through a network of equipotential lines to form an image on a target (14). The shutter electrode (17) is annular and conforms with an equipotential line. Deflection electrodes (20a,20b) and an image sequencer (21) make it possible to influence the position of a sequence of small images on the target (14) where they are temporarily stored.

Abstract: A device for automatic sound control includes a detection circuit for supplying objective sound and/or noise measurements relating to an ambient sound volume, and a fuzzy logic control circuit for adjusting, in response to the ambient noise measurements sound transmission characteristics supplied by an acoustic device. The device includes a fuzzy logic conversion circuit which is arranged between the detection circuit and the control circuit and transforms the objective ambient noise measurements into subjective ambient noise measurements for performing said settings. The device can learn the personal settings defined by a listener. The device can also detect speech and perform specific settings.