TY - BOOK ED - Open University. ED - Open University. TI - Electronic signal processing T2 - Electronic signal processing : a third-level technology course SN - 0335172024 (pbk) PY - 1984/// CY - Milton Keynes : PB - Open University Press, KW - Signal processing N1 - Includes index; At head of title: The Open University; Contents: Unit 9 : Analogue filters _ Unit 10 : Approximating filter responses _ Unit 11 : Introduction to digital filters _ Unit 12 : Topics in digital filter design ER -