TY - BOOK AU - Couch,Leon W. TI - Digital and analog communication systems SN - 0135225833 AV - TK5101 C853D 1997 PY - 1997/// CY - Upper Saddle River, N. J. PB - Prentice Hall KW - Telecommunication systems KW - Digital communications N1 - Includes bibliographical references and index ER -