VIDEO SIGNAL PROCESSING UNIT OF SECONDARY PICTURE

摘要

PURPOSE: To provide a processing unit for supplying secondary image data to a display system in accordance with the selection of a reduction ratio. CONSTITUTION: The processing unit 13 reduces the luminance component of an analog input signal by sampling data at a speed matching the reduction ratio selected next by using an aliasing preventing analog low-pass filter 22. A digital filter 24 processes the sampled data an supplies an weighted average value extracted from the sampled data. A formater 25 connects the sampled color data with luminance data passed through the filter and selects a line to be included in a primary image.