00330nam a22001337a 4500003000400000005001700004008004100021020001500062040000800077100001600085245004500101250001000146260004000156OSt20180731134727.0180731b        xxu||||| |||| 00| 0 eng d  a0135225833  cN/A  aCouc Leon W  aDigital and analog  communication system  a5thed  aNew JerseybPrentice Hall Incc1997