New method for the implementation of an NTSC digital video decoder

This paper presents a new method for the implementation of an NTSC digital video decoder. This new fully digital architecture uses a phase-locked loop to compensate the unstable video source and an adaptive comb filter to improve the quality of Y/C separation. Simulation results show that it can successfully combat a sinusoidal timing variation of /spl plusmn/2 /spl mu/s for horizontal line lengths within one frame. It can also lock to a 3.58 MHz color subcarrier with frequency variation up to /spl plusmn/500 Hz.