Henrique Sarmento Malvar. / Originally presented as author's thesis (Ph. D.-- Massachusetts Institute of Technology), 1986. / Includes bibliographies. / "This work has been supported in part by the Brazillian Government through its Conselho Nacional de Desenvolvimento Cientifico e Tecnologico. It has also been supported in part by the Center for Advanced Television Studies, an industry group consisting of the Amercian Broadcasting Company, Ampex Corporatin, Columbia Broadcasting Systems, Harris Corporation, Home Box Office, Public Broadcasting Service, National Broadcasting Company, RCA Corporation, Tektronix, and the 3M Company."