Abstract :
The COM3 coding system provides a way of conveying a component signal, with quality approaching that of CCIR Rec. 601, as a single signal that may be handled by existing composite PAL studio equipment. The signal resembles conventional PAL below about 5.5 MHz, allowing existing PAL monitors to be used. A normal composite mixer may be used to provide effects such as mixing and wiping. The coding method is non-adaptive and uses no field delays, being based primarily on horizontal filtering and modulation techniques and the principles of subband coding
