Yog tias koj yuav cov nkauj thiab albums ntawm iTunes Store, ces cov ntaub ntawv koj rub tawm yuav nyob rau hauv Advanced Audio Coding (AAC). Txawm li cas los xij, Apple muaj lwm tus codec, Apple Lossless Audio Codec (ALAC), uas koj tuaj yeem siv thaum ripping CDs lossis hloov los ntawm lwm hom ntaub ntawv. Kab lus no piav qhia qhov txawv ntawm ob hom.
ALAC yog dab tsi?
Qhov kev xaiv ALAC hom hauv iTunes yog luv rau Apple Lossless Audio Codec (lossis tsuas yog Apple Lossless), thiab nws tsis compress koj lub suab paj nruag rau qhov uas lub suab zoo cuam tshuam. Lub suab tseem compressed zoo li AAC, tab sis qhov sib txawv loj yog tias lub suab zoo tseem zoo ib yam rau qhov chaw. Cov hom ntawv tsis muaj suab no zoo ib yam li lwm hom ntawv uas koj yuav tau hnov txog, xws li Dawb Lossless Audio Codec (FLAC).
Cov ntaub ntawv txuas ntxiv siv rau ALAC yog.m4a, uas yog tib yam li AAC hom ntawv. Qhov no tuaj yeem ua rau tsis meej pem yog tias koj pom cov npe nkauj ntawm koj lub khoos phis tawj lub hard drive, tag nrho nrog tib.m4a cov ntaub ntawv txuas ntxiv. Yog li ntawd, koj yuav tsis pom qhov twg yog qhov twg tau encoded nrog ALAC lossis AAC tshwj tsis yog tias koj qhib qhov Kind kab xaiv hauv iTunes. Txhawm rau ua kom hom kab ke, xaiv View Options > Show Columns > Kind
Vim li cas siv ALAC Hom?
Qhov laj thawj tseem ceeb ntawm kev xav siv ALAC hom yog tias lub suab zoo yog qhov tseem ceeb rau koj, tab sis ntawm no yog ob peb yam ntxiv ALAC pros:
- Tsis Tsis Muaj Qhov Zoo Thaum Ripping CDs: Yog tias koj xav khaws koj cov CDs qub, ripping lawv nrog ALAC kev xaiv yuav tsim cov ntawv luam zoo meej ntawm koj cov discs.
- Yooj yim Hloov mus rau lwm hom ntawv: Tej zaum koj yuav paub tias kev hloov pauv los ntawm ib hom ntawv lossy mus rau lwm hom ntawv poob ua rau lub suab zoo. Txawm li cas los xij, yog tias koj siv hom ntawv tsis zoo li ALAC, ces koj tuaj yeem hloov mus rau txhua yam yam tsis tau poob cov ntaub ntawv suab.
- Rov qab cov CDs uas raug puas tsuaj: Khaws koj lub cev nkauj sau (piv txwv li, CDs) raws li ALAC cov ntaub ntawv muab kev xaiv rau koj rov tsim dua yog tias cov khoom qub puas lossis ploj. Koj tuaj yeem hlawv cov ntaub ntawv ALAC rau hauv CD kaw, uas yuav muab rau koj ib daim ntawv theej ib yam ntawm cov disc uas koj tau thaub qab.
Qhov tsis zoo ntawm kev siv ALAC
Tej zaum koj tsis xav tau ALAC txawm tias nws zoo dua rau AAC ntawm lub suab zoo. Qhov tsis zoo rau kev siv ALAC suav nrog:
- Larger Files: Ib yam li lwm yam tsis muaj codecs, ALAC encoded audio tsim cov ntaub ntawv loj dua li cov ntawv poob. Yog li ntawd, koj yuav xav tau qhov chaw cia ntau dua li siv AAC. Tshwj tsis yog lub suab zoo tseem ceeb, ces qhov kev sib pauv no yuav tsis tsim nyog.
- Less Compatible With Hardware: Muab piv rau cov hom kev poob nrov zoo li AAC, muaj kev txhawb nqa tsawg dua rau ALAC. Yog tias koj tsuas yog siv Apple li, qhov no tsis yog qhov teeb meem vim tias tag nrho cov khoom siv Apple txhawb ALAC. Txawm li cas los xij, yog tias koj xav tias koj tuaj yeem siv portables los ntawm kev sib xyaw ntawm cov tuam txhab lag luam yav tom ntej, ALAC yuav tsis yog koj qhov kev daws teeb meem zoo tshaj plaws-txawm tias koj tuaj yeem hloov los ntawm ALAC mus rau lwm hom kev txhawb nqa dav dav, xws li FLAC.
- Koj Puas Hnov Qhov Sib Txawv? Yog tias koj npaj siab mloog suab paj nruag los ntawm pob ntseg pob ntseg, koj yuav tsis hnov qhov txawv ntawm AAC thiab ALAC. Txawm hais tias lossy tawm tswv yim zoo li AAC pov tseg cov ntaub ntawv suab, tus nqi qis (256 Kbps thiab siab dua) feem ntau zoo txaus rau cov neeg feem coob.
