文档介绍：多媒体格式专利费参考标准MultimediaStandardsLicensingFee           paniesbuildingnextgenerationmultimediaproducts. Mostlicensingfactsarereferringtopatentpools. Additionalcostswouldbehighqualityencoderandpotentiallydecoderimplementations. Mostmultimediastandardsalgorithmsareasymmetrical. Inotherwords,putationally.  Thisisduetotheconceptthatencoderwouldbeusedonservers,inprofessionalbroadcastsysteminprofessionalmoviestudioauthoringtools;applicationswherethecostsofencodingdidnotimpactthedeliverymechanismorcosttoconsumers. Finally,inmoststandards,exceptforAC-3,theencoderisnotnormative. . Themainpointofthisdiscussionistonotethehighvarianceinencodertechnologyqualityandtoalsobeawarethatindividualimplementationsofcoders,shouldtheybedeemednecessaryforthisproductwillhaveadditionallicensingandfeecosts. StandardsEachStandardisgivenabriefdescription,applicationswhereitisinuse,licensingtermsandcontactinformation.   GnuPublicLicenseoranysortofalgorithmorapplicationthatdoesnotrequirepaymentisnotaddressedinthisdocument. worksformatsorotherlesser“player”.         MPEG1/2,LayerIII(MP3)1.  TypeMPEG1/2,pressionalgorithm. plexityratioof15:1. CompressionRatio12:.  DescriptionUbiquitous,MP3is“standard”aswellasportableplayerstandard. Cons: verypoorperformanceonspeechsignals,qualityvariesgreatlydependinguponimplementation. MPEG1,LayerIIIperformspoorlyintandeming.   pressionresearch. ManydifferentMPEG1-,thusqualityvariesfromextremelygoodqualitytoencodersthatwillnotevenproduceaproperbitstream. 3.  ContentIllegalcopyingofcontentlaunchedMP3andtodayonecanfindalmostanythingavailableinfreedownloadusingpeer-to-peersoftwareKazaainMP3format. NOMediaservicethatdoesnotsupportMP3couldbelocatedinQ3/03.   -.         MP3Pro1.  TypeMP3ProinarchitectureconsistsofmodificationstotheMPEG1-LayerIIIalgorithmthataddoneadditionalDSPmodule. Thism