音频测量手册

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1、AUDIOMEASUREMENTHANDBOOKBobMetzlerAudioPrecision,Inc.Copyright©1993AudioPrecision.Allrightsreserved.SecondeditionforPDF,January,2005.AudioPrecisiondocumentnumber0058.0003r1Nopartofthisbookmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingph

2、otocopying,recording,orbyanyinformationstorageandretrievalsystem,withoutpermissioninwritingfromthepublisher.Publishedby:AUDIOPRECISION5750SWArcticDriveBeaverton,Oregon97005U.S.A.Telephone:(503)627-0832U.S.Toll-freetelephone:(800)231-7350FAX:(503)641-8906Website:audiopreci

3、sion.comPrintedintheUnitedStatesofAmericaV0127090352ABOUTTHISBOOKTheAUDIOMEASUREMENTHANDBOOKisintendedaspractical,hands-onassistanceforworkersinallphasesoftheaudiofield.Itstreatmentoftopicsdoesnotinvolvemathematicsbeyondsimplealgebra.Althoughpub-lishedbyAudioPrecision,the

4、measurementtechniquesdescribedgenerallyarenotspecifictoAudioPrecisioninstruments,butapplytoanyaudiotestingequipment.Thefirstsectiondescribesbasictoolsandtechniquesandincludesguidestoaidintheselectionofappropriateaudiotestinstruments.Thesecondsectiondiscussesthecommonenvir

5、onmentsforaudiotesting.Thethirdsec-tionappliesthesetechniquestovariouscommonly-usedtypesofaudioequip-mentanddescribesthetypicalrangesofperformancetoexpectinthatequip-ment.SectionFourisaglossaryofspecificaudioterminologyandmajorspeci-ficationsusedintheaudiomeasurementfield

6、.ABOUTTHECOVERTheclassicaudiotestinstrumentsonthecoverarefromthe“museum”atAudioPrecision.MostarefromthepersonalcollectionofWayneJones;allarefullyfunctional.TheModel200oscillatorwasthefirstproductdevelopedinthelegendaryPaloAltogaragebyHewlettandPackard.Theblackcrackle,wood

7、encabinetGeneralRadioModel1932AandtheHP330providedagener-ationofbroadcastengineerswiththeirfirstabilitytomeasuredistortion.TheTektronixTM500instrumentsweredesignedbytheengineerswholaterfoundedAudioPrecision.ACKNOWLEDGEMENTSTheauthorwishestothankthefollowingindividualsfork

8、eyadviceandas-sistanceinthedevelopmentofthishandbook:BruceHoferofAudioPrecision,especiallyforhis