00460nam a2200121   4500020002400000082002100024100004200045245003000087260005100117300003700168500002000205650011300225  a9788120305328 (pbk)  a621.3819582bOPP  aOppenheim, Alan V.aRonald W. Schafer  aDigital signal processing  aNew delhi bPHI learning private limitedc1975  axiv, 585 p. b: ill. c; 23 cm.   aInclude index.   aDigital signal processingvFourier transformationsvDigital filtervDigital electronicsvSignal theoryvFEAS