Abstract: An electromechanical transducer made of a piezo-polymer film is presented. The film is transparent and is applied to a television screen, glass pane of a framed picture, or the like. The piezo-polymer film is arranged to provide a plurality of loudspeakers of a television apparatus which can be controlled by a digital audio signal.

Abstract: Locking apparatus wherein the locking of the form-fit structure of locking is divided into two movements with the two directions of being generally perpendicular to each other. In the first movement, the snap-in elements are pre-stressed whereby the final locking does not yet occur. It is only in the second movement in a direction approximately perpendicular to the first movement that the final locking occurs by the locking of the snap-in elements. This division of directions permits the keeping of the movement distance for connection as short as desired even in tight spatial circumstances.

Abstract: A frame for a loudspeaker unit used, for example, in a television receiver, has provisions for optionally fastening one type of loudspeaker to the frame by a positively-locking fastening arrangement or another type of loudspeaker by screw fastening. Specifically, the frame includes both a positively-locking click-stop arrangement for snap-in fastening, and also clip elements for holding the loudspeaker during a screwing operation.