VIDEO DATA MEMORY: A NEW DESIGN FOR A HIGH SPEED HIGH DENSITY SYSTEM

A MULTI-HOLOGRAPHIC OPTICAL HEAD MULTI-OPTICAL FIBER CHANNEL ARCHITECTURE IS PROPOSED, EXPECTING TO ACHIEVE A HIGH SPEED (500 FRAMES PER SPEED) HIGH DENSITY (1024X1024X8 BITS) VIDEO DATA MEMORY SYSTEM FOR NEW SOLID STATE IMAGES. THE SYSTEM WOULD BE PROGRAMMABLE; VOLUME WILL STAY WITHIN 200 INCH; OUTPUT CAN BE DIGITAL OR NTSC ANALOG. THE SYSTEM IS INTENDED FOR USE IN EXTREMELY SEVERE AIRBORNE CONDITIONS. UNLIKE CONVENTIONAL ELECTRONIC MEMORY SYSTEMS, THE PROPOSED SYSTEM WOULD HAVE TWO HEADS AND 8 OPTICAL FIBERS (CHANNELS) TO READ AND WRITE ON BOTH SIDES OF A DISK, AND THUS REALIZE HIGHER SPEEDS. ACCESS TIMES ARE MUCH SHORTER, THE SYSTEM WOULD USE A LIGHTWEIGHT HOLOGRAPHIC OPTICAL HEAD WITH A MOVING MASS OF LESS THAN 10 GRAMS. THE DESIGN WOULD UE A SHORT (680 NM) INSTEAD OF A LONG WAVELENGTH (823 NM) LASER DIODE, THEREBY INCREASING THE RECORDING DENSITY AT LEAST 50%. A PHILIPS AIR STANDARD STRUCTURE IS CONSIDERED, WITH A PHASE-CHANGE ERASABLE MATERIAL SUCH AS THE SELENIUM-INDIUM-ANTIMONY ALLOY. A 12 INCH DISK WOULD YIELD AT LEAST 30 SECONDS OF VIDEO DATA.