Abstract: A pitch change mechanism for a plurality of fan blades (12) comprises adjustment device (60) to rotate the blades (12) about their longitudinal axes. A gear box (34) provides rotary power to drive the adjustment device (60) in response to a control signal. The gear box (34) is mounted in the fan shaft (30) and rotates therewith. An input shaft (33) to the gear box (34) is mechanically connected to a turbine shaft (32) so that the input shaft (33) rotates with the turbine shaft (32). The difference between the speeds of the fan shaft (30) and the turbine shaft (32) is used to drive an output shaft (39) of the gear box (34). The rotary power of the output shaft (34) drives the pitch adjustment device (60) via a plurality of gears (50).

Abstract: Apparatus for increasing the color and spatial resolutions of existing raster graphics systems by reformatting the output word transmitted to the system display device. For increasing the color resolution, two consecutive outputs of a graphics adapter in the system are grouped into a reformatted output that contains a greater number of bits. The reformatted output forms the address to a color mapping RAM with multiple palettes. Switch commands may be inserted within the display data to dynamically select between the original and reformatted outputs and among the active color palettes of the RAM, if desired. For increased spatial resolution, the original adapter output is divided into multiple reformatted outputs. A multiplexer alternately selects these multiple outputs at twice the rate that the graphics adapter produces its original output. The multiple outputs generate two different color signals for a single pixel location to double the horizontal spatial resolution.