Iikhowudi ziguqulela intshukumo ejikelezayo okanye yomgca kwisignali yedijithali.Iimpawu zithunyelwa kumlawuli, obeka iliso kwiiparamitha zentshukumo ezifana nesantya, isantya, icala, umgama, okanye indawo.Ukusukela ngo-2004, iikhowudi zokufaka iikhowudi zeGertech ziye zasetyenziswa kwiimfuno ezingenakubalwa zengxelo kumashishini amaninzi.Xa ukhetha i-encoder efanelekileyo kwisicelo sakho, kubalulekile ukuqonda indima ye-encoder kwinkqubo yakho yokulawula intshukumo.Ukunceda kuloo nto, siqulunqe ithala leencwadi lezicelo eziqhelekileyo ezihlelwe yimizi-mveliso ukukunceda ufumane ikhowudi echanekileyo yesicelo sakho solawulo lwentshukumo.