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
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