METHOD AND APPARATUS FOR CONVERTING TELEVISION SIGNAL

摘要

PURPOSE:To improve compressing efficiency without picture quality deterioration by outputting selectively and alternately a 1st color signal separated and a 2nd color signal whose phase is inverted to the 1st color signal for each scanning line and synthesizing the output with a luminance signal. CONSTITUTION:An NTSC color TV signal inputted from a TV camera 1 is sampled by an AD converter 2 to generate a composite signal P. A YC separation circuit 3 separates the composite signal P into a luminance signal Y and a chrominance signal C. A switch circuit 5 selects the chrominance signal C and a chrominance signal C' being the result of phase inversion of the signal C at a chroma inverter 4 for each scanning line and the result is used as a new chrominance signal C'' and outputted to a YC synthesis circuit 6. The YC synthesis circuit 6 synthesizes a luminance signal Y and the chrominance signal C'' to output a new composite signal P'' to a digital signal processing circuit 7. The signal is converted into the original composite signal P by a YC separation circuit 8, a chroma inverter 9, a switch circuit 10 and a YC synthesis circuit 11.