Low-cost video decoder with 2D2L comb filter for NTSC digital TVs

A low-cost video decoder for NTSC signals is present in This work. The proposed NTSC video decoder design employs a 2D2L comb filter, and a DDFS-based DCO (digital control oscillator) basing upon trigonometric quadruple angle formula in a digital PLL to track and lock the demodulation clocks. The complexity of the digital video decoder, hence, is drastically reduced.