Design of secam video encoder and decoder system using modified anti-cloche filter, BPF and error-free square root
Juhyun Kim, Jooyoung Ha, Bongsoon Kang · 2006
In this paper, we propose the Sequentiel Couleur Avec Memoire or Sequential Color with Memory (SECAM) video encoder system using modified anti-cloche filters and the SECAM video decoder system using a band pass filter (BPF) and an error-free square root. The SECAM encoder requires an anti-cloche filter recommended by International Telecommunication Union Recommendation (ITU-R) Broadcasting service Television (BT) 470. However, the design of the anti-cloche filter is difficult. It is because the frequency response of the anti-cloche is very sharp around rejection-frequency area. So, we convert the filter into a high pass filter (HPF) by shifting the rejection frequency of 4.286MHz to 0Hz frequency. The design of HPF becomes very easy, compared to that of the anti-cloche filter. The proposed decoder also uses an error-free square root, two differentiators, and trigonometric functions to extract color-component information of Db and Dr accurately from frequency modulation (FM) signals in SECAM systems. The proposed systems are experimentally demonstrated with ALTERA FPGA APEX20KE EP20K1000EBC652-3 device and TV sets.