Design of digitalized SECAM video encoder and decoder system using modified anti cloche filter, error-free square root and BPF

In this paper, we propose the modified SECAM video encoder and decoder system. The SECAM broadcasting standard uses frequency modulation (FM) to transmit the Db and Dr color difference information with each component having its own sub-carrier. The SECAM encoder system requires an anti-cloche filter recommended by ITU-R BT.470. However, the design of the filter is difficult, because the frequency response of the filter is very sharp. So, we convert standard filter into digital filter which could be designed more easily than analog standard filter. The proposed SECAM decoder uses two differentiators, trigonometric functions and an error-free square root to demodulate color information in chrominance processing. The BPF in decoder is used for removing color noise in chrominance and dividing CVBS into chrominance and luminance. The proposed system is experimentally demonstrated with ALTERA FPGA and TV set.