LETTER BOX CONVERTER

摘要

A read control circuit (13) reads image data stored in a decoded-image memory (12) at a read speed which is m/n of the display speed. A write control circuit (16) writes the image data in line memories (14 and 15) in units of data of one line. A read address control circuit (17) reads the image data from the memories (14 and 15) at the display speed and multipliers (18 and 19) and an adder (21) generate line data for letter box image. Namely, the line data of m lines read out of the memory (12) are converted into the line data of n lines and letter box display becomes possible. Consequently, a letter box converting process is performed with a small memory capacity without using any one-field memory. <IMAGE>