DSＰ导论.pdf

嵌入式硬件设计参考系列之DSＰ导论.pdfINTRODUCTIONSECTION1INTRODUCTION1.aINTRODUCTION1.bINTRODUCTIONSECTION1INTRODUCTIONWaltKesterORIGINSOFREAL-WORLDSIGNALSANDTHEIRUNITSOFMEASUREMENTInthisbook,wewillprimarilybedealingwiththeprocessingofreal-worldsignalsusingbothanaloganddigitaltechniques.Beforestarting,however,let'slookatafewkeyconceptsanddefinitionsrequiredtolaythegroundworkforthingstocome.Webster'sNewCollegiateDictionarydefinesasignalas"Adetectable(ormeasurable)physicalquantityorimpulse(asvoltage,current,ormagneticfieldstrength)bywhichmessagesorinformationcanbetransmitted."Keytothisdefinitionarethewo