00367nam a2200145Ia 4500008004100000020001500041041001200056082001600068100001600084245005800100250000800158260003900166300000800205650000800213221030s9999    xx            000 0 und d  a8178083280  aEnglish  a105.23bCou  aL. W. Couch 0aDigital & Analog Communicaton Systemscby L. W. Couch  a6th  bPearson EducationaNew Delhic2001  a758  aECE