Abstract: An insulating board is formed of a low density insulating material, such as polystyrene foam. The board has apertures therein and a plurality of slots on its upper and its lower surfaces, the slots in the lower surface being offset from those in the upper surface. A high density material, such as gypsum or artificial resin or a cement fills the apertures and slots and extends over the upper and the lower surfaces of the board and, if desired, over it edges to form a composite sheet. Sheets of paper, plastic or metal may be fixed to the top and to the bottom of the composite sheet. A tile may be provided by affixing a planar sheet or the like to the top side of the composite sheet, the planar sheet, when in place, conforming to the upper surface of the composite sheet. A method of making the sheet involves bringing the board of low density material into contact with the material of higher density and allowing it to set or cure.

Abstract: A method of and system for defining and photographing computer graphic images involves using photographic exposure adaptor (PXA) circuitry, providing an interface between a computer having a CPU and a film printer. The interface circuitry includes a page register. A cathode ray tube controller is operatively arranged to provide address, vertical synchronization and horizontal synchronization signals when an image is being displayed on a CRT in the film printer. A display random access memory array is operatively arranged to be filled with pixel data under control of the CPU. When an image is to be displayed, control of the array is given to the controller. A multiplexer selects addressing lines to the array. A display random access memory data buffer enables output from the array to be placed on the internal data bus. An exposure mapping table is operatively arranged to be accessed by either the CPU or the controller.

Abstract: Clutter suppressors and methods of clutter suppression for radars which employ the doppler effect for enhancing signals due to moving targets relative to signals due to clutter caused by land, sea or rain. Specifically, the disclosure concerns suppressors and methods of clutter suppression for cw doppler, pulse doppler and MTI (moving target indication) radars. The suppressors reduce the occurrence of radar output due to clutter by permitting and prohibiting radar output on the basis of the strength of signals that contain doppler frequency components of the radar echo.

Abstract: A participant-identification, recording and playback system includes a plurality of radio transmitters, preferably FM transmitters, which are tuned to respectively different center frequencies, and serve as respective wireless microphones assigned to respective participants. A radio receiver which is operatively associated with a recording and playback system is provided to receive signals from all of the wireless microphones, reduce these to a plurality of IF signal and record the same. The playback portion of the system includes a plurality of demodulators which allows one to recover all the audio signals on a selective basis for transcription. Circuitry is provided to identify the speakers and to indicate start and stop times.

Abstract: Clutter suppressors and methods of clutter suppression for radars which employ the doppler effect for enhancing signals due to moving targets relative to signals due to clutter caused land, sea or rain. Specifically, the disclosure concerns suppressors and methods of clutter suppression for cw doppler, pulse doppler and MTI (moving target indication) radars. The suppressors reduce the occurrence of radar output due to clutter by permitting and prohibiting radar output on the basis of the relative strength of signals that contain doppler frequency components of the radar echo.