Overlap apparatus for digital TV

An apparatus for combining signals in a digital TV system, comprising:

• a first source for providing a first digital video signal;
• a second source for providing a second digital video signal;
• first and second digital multipliers connected to receive said first and second video signals, respectively, each having a controllable multiplication factor;
• means connected to inversely control the multiplication factors of said first and second digital multipliers;
• digital adding means connected to digitally add multiplied outputs of said first and second digital multipliers;
• means for digitally limiting the added output of said digital adding means;
• and
• means for converting a limited output of said digital limiting means to an analog signal, to thereby provide a combined output signal, and wherein said second source comprises a memory connected to receive output signals from said digital limiting means, and means for selectively controlling said memory to record said output signals from said digital limiting means and apply signals stored therein to said second digital multiplier.