Enlargement degree of fine television system

摘要

An enhanced MAC signal for satellite broadcasting purposes is provided by adding additional chrominance and luminance component information to the existing signal without altering the timing relationship of the existing component information. This is done by adding the additional information in the field blanking interval as well as using the time allocated to two sound channels in the data burst preceding the video information in the MAC signal. Preferably chrominance signals are added in the field blanking interval and the corresponding luminance signals are added to the active lines in the time normally allocated to the two sound channels. In this way an aspect ratio of substantially 5:3 can be achieved without affecting the usual 4:3 aspect ratio picture.