Abstract: A loud speaker and enclosure system that has improved acoustical properties, comprises a cubical frame composed of two sidewalls, a top and a bottom, having an open front and back. The frame is made of substantially rigid material. The backwall is closed by means of a panel of styro-foam. An acoustical horn in the form of a truncated square pyramid is molded from foamed plastic and is of such size as to be fitted into the inner space of the frame with the wide end of the pyramid at the front end of the frame. Means are provided at the corners of the pyramid, for attachment to the frame. Along the walls of the horn there is a space between the walls of the horn and the walls of the frame, of selected dimension. At the small end of the horn is a transverse wall, which has a circular opening. A low frequency, large diameter, cone type speaker is fastened to this wall, mounted inside of the horn, with the cone facing toward the back of the frame.

Abstract: Apparatus for generating and processing television TV signals of a visual scene for viewing in three dimensions, comprises a conventional TV camera, including three separate color video camera tubes, each camera tube adapted to receive light of a different one of the three primary colors. Each camera tube is aligned with one of three optical axes which are nominally parallel, and are spaced apart a selected distance in a horizontal plane. At least one of the first and third axes is rotatable so that it can be turned through a small angle in such a direction as to intersect the second and third axes at selected distances in front of the camera. Synchronizing beams are provided for two sub-rasters in scanning of the camera tubes. During a first scan, the first primary color signal from the first camera tube is muted, and on the second sub-raster, the third camera tube output carrying a third primary color signal is muted.