Puas muaj qhov ntxiv rau ntawm AAC ua nws zoo dua nyob hauv txhua lub sijhawm?
Tej zaum koj yuav xav tias Apple yog lub luag haujlwm los tsim cov AAC Plus hom ntawv (qee zaus hu ua AAC +). Tab sis, nws yog, qhov tseeb, ib lub npe lag luam uas siv los ntawm Coding Technologies rau lawv hom ntawv kho-khawm HE-AAC V1. Yog tias koj xav tias nws lub taub hau ntawm lub npe yog qhov twg, ces nws yog luv rau High Performance . Qhov tseeb, AAC Plus feem ntau hu ua HE-AAC es tsis siv lub npe ntxiv lossis + cim.
Lub suab hom ntaub ntawv txuas ntxiv nrog AAC Plus yog:
- .m4a
- .MP4
- ., M4b
- .m4V
Tab sis, qhov txawv ntawm qhov no thiab cov qauv AAC txawv li cas?
Lub hom phiaj tseem ceeb ntawm HE-AAC (High-Efficiency Advanced Encoding) yog thaum lub suab xav tau kev pab cuam zoo los ntawm cov nqi qis qis. Ib qho zoo tshaj plaws ntawm qhov no yog thaum hu nkauj yuav tsum tau muaj thoob plaws hauv Internet uas siv qhov tsawg tshaj plaws ntawm bandwidth tau. Piv rau cov qauv AAC nws tseem zoo dua ntawm kev khaws cov txiaj ntsig zoo ntawm cov nqi tsawg dua 128 Kbps - ntau tshaj li ntawm 48 Kbps lossis tsawg dua.
Tej zaum koj yuav xav tias nws tseem zoo dua ntawm cov cim suab ntawm cov nqi siab heev. Tom qab tag nrho, tsis tus Plus tom qab AAC (los yog nws ua ntej nws) muab rau koj lub siab tias nws yog zoo dua puag ncig?
Sadly no tsis yog cov ntaub ntawv. Tsis muaj hom ntawv ua tau zoo rau txhua yam thiab qhov no yog qhov AAc Plus muaj qhov tsis zoo thaum piv rau tus qauv AAC (los yog MP3). Thaum twg koj xav khaws cia qhov zoo ntawm cov ntaub ntawv kaw suab uas siv lub suab lus los yog , ces nws tseem zoo dua los siv cov qauv AAC thaum bitrate thiab cov ntawv ntau ntau tsis yog koj qhov teeb meem loj.
Compatibility Nrog iOS thiab Android Devices
Muaj, feem ntau (yog tias tsis yog txhua yam) portable li uas yog raws li hauv iOS thiab Android yuav txiav txim siab suab hauv AAC Plus hom ntawv.
Rau iOS no li siab tshaj version 4, AAC Plus cov ntaub ntawv tau hais nrog ntau tshaj qhov zoo. Yog tias koj muaj cov cuab yeej Apple uas laus tshaj li qhov no ces koj tseem yuav muaj peev xwm tuaj yeem ua cov ntaub ntawv no, tab sis yuav muaj kev txo tsawg hauv kev ncaj ncees. Qhov no yog vim hais tias SBR ib feem, uas muaj kev qhia ntau zaus (treble), tsis yog siv thaum cim seev suab. Cov ntaub ntawv yuav raug kho li yog lawv tau encoded nrog AAC-LC (Low Complexity AAC).
Yuav ua li cas hais txog Software Media Players?
Kev tshaj tawm software xws li iTunes (version 9 thiab ntau dua) thiab Winamp (pro version) txhawb qhov kev daws teeb meem thiab kev hais tawm ntawm AAC Plus. Hos lwm cov software xws li VLC Media Player thiab Foobar2000 tuaj yeem playback HE-AAC encoded audio files.
Lub hom ntawv zoo li cas siv tau suab
AAC Plus algorithm (siv cov suab paj nruag cov suab paj nruag nyiam Pandora Xov tooj cua), ntiav ib lub tshuab hu ua Spectral Band Replication (SBR) los txhim kho cov kev ua suab paj nruag thaum tsim kom muaj kev txav ceev. Qhov no system ua tau replicates ploj lawm dua frequencies los ntawm transposing qis frequencies - cov no yog muab ntawm 1.5 Kbps. Incidentally, SBR kuj siv lwm hom xws li MP3Pro.
Streaming suab
Raws li cov software media players txhawb AAC Plus, cov kev pab suab paj nruag xws li Pandora lub xov tooj cua tau hais ua ntej (thiab lwm yam kev siv xov tooj cua hauv Internet ) siv tau cov ntawv no rau kev qhia cov ntsiab lus. Nws yog ib lub tswv yim zoo tshaj plaws uas siv vim nws cov kev txwv tsis muaj kev txwv bandwidth - rau kev hais lus hauv particular qhov chaw uas tseem yuav tsawg li 32 Kbps feem ntau xam zoo.