AAC vs MP3
AAC thiab MP3 yog cov suab compression siv lossy compression. MP3 yog lub suab codec nrov dua uas tau dhau los ua tus qauv hauv kev lag luam suab paj nruag. Ntau npaum li ntawd portable media player tam sim no feem ntau hu ua MP3 players. Mp3 tso cai compression ntawm cov ntaub ntawv audio los ntawm feem pua lossis ntau. Yog hais tias ib zaj nkauj muaj ib tug loj ntawm 30 MB, tom qab hloov dua siab tshiab rau MP3 hom ntawv nws loj yuav txo tau tsuas yog 3 MB. MP3 tau tso tawm xyoo 1993 thiab sau ua ntaub ntawv txuas ntxiv hom.mp3. AAC tau tso tawm ib xyoos tom qab xyoo 1997 thiab muaj ntau yam kev txhim kho dua MP3. Txawm li cas los xij, txhawm rau txhawm rau cov ntaub ntawv audio, ob hom ntawv yuav tsum tau txi qee qhov ntawm cov qhab nia qub thiab qhov no yog vim li cas lawv thiaj li hu ua cov ntawv poob.
MP3
Mp3 yog hom suab tsim los ntawm Motion Pictures Experts Group (MPEG) ua ib feem ntawm nws tus qauv MPEG-1 thiab tom qab ntawd txuas ntxiv mus rau MPEG-2 tus qauv kuj. Lossy compression algorithm yog siv hauv MP3 kom txo tau cov ntaub ntawv ntau hauv cov ntaub ntawv audio. Thaum cov ntaub ntawv audio compressed ntawm tus nqi me ntsis ntawm 128kbit / sec, nws yog 11 npaug me dua li cov ntaub ntawv qub. Qhov me me ntawm cov ntaub ntawv audio hloov dua siab tshiab rau MP3 coj mus rau lub kiv puag ncig ntawm kev xaiv thiab tsis ntev Mp3 cov ntaub ntawv nthuav tawm hauv internet. MP3 enabled neeg mus download tau zaj nkauj los ntawm lub vas thiab kuj tremendously nce cov phooj ywg rau cov phooj ywg sib koom. Mp3.com tau tsim tawm uas muab ntau txhiab zaj nkauj dawb rau cov neeg mloog hauv net. Peer to peer files sib koom network Napster tau nrov heev. Cov kws ua yeeb yaj kiab thiab cov tuam txhab kaw tau tawm tsam Napster vim nws ua txhaum txoj cai lij choj thiab yog li nws tau kaw sai sai. Txhawm rau tswj kev sib koom pub dawb thiab rub tawm cov ntaub ntawv suab paj nruag, tuam txhab lag luam siv cov cuab yeej encrypting hu ua Digital Rights Management.
AAC
AAC, tseem hu ua Advanced Audio Coding yog lwm hom suab uas siv lossy compression rau encoding digital audio. AAC tau tsim los ua tus neeg txuas ntxiv ntawm MP3 thiab ua tiav lub suab zoo dua li MP3. Tab sis nws yeej tsis ua tau zoo li MP3. Nws tseem hu ua Apple tus me nyuam, ua tus qauv suab hom rau iPhone, iPod, iTunes, thiab iPad. AAC tau tsim los ntawm kev koom tes los ntawm Nokia, Sony, AT&T Bell Laboratories thiab Dolby Laboratories.
Txawm tias AAC ua rau muaj ntau yam kev txhim kho dua MP3, MP3 tau tshawb nrhiav ntau dua li AAC. Qhov no yog vim li cas muaj tsawg heev codecs rau AAC dua MP3. MP3 yog nrov thiab txais los ntawm software thiab music player manufacturers. AAC tau nrov thaum Apple tau txais cov hom ntawv no rau iPhones thiab iPods thiab tseem pib muag cov nkauj hauv iTunes. Txawm li cas los xij, ntawm lig, cov suab paj nruag niaj hnub tau muab kev txhawb nqa rau AAC thiab yog li qhov sib txawv ntawm MP3 thiab AAC tsawg dua li ob peb xyoos dhau los.
Summary
• MP3 thiab AAC yog hom suab rau kaw.
• AAC tsim suab zoo dua MP3, thiab cov nyhuv no tau hais ntau dua ntawm tus nqi qis dua.
• Mp3 nrov dua AAC.
