A Ram based Circuit for Colour Difference Interpolation of a MAC - Type Video Signal

This paper describes the design and implementation of a digital video ASIC (Application Specific Integrated Circuit) that performs the line interpolation of the missing color samples of a digitized MAC (Multiplex Analog Componant) video signal. The main part of this circuit is a specific 864×8 bits memory designed as a double chroma digital delay line. The design is based on 2 micron double metal N-Well CMOS technology. The chip area is 35.6 mm² and it operates with a clock rate of 13.5 MHz. This circuit, which also performs phasing and blanking of the 8-bit digitized luminance and chrominance samples, is a part of a digital decoder used for the reception of video TV signals coded according to the MAC family system.