Taw qhia rau HE-AAC
HE-AAC (uas yog feem ntau hu ua aacPlus ) yog ib qho kev npliag los ntawm lub suab nrov thiab nws tseem luv rau High Efficiency Advanced Audio Encoding. Nws yog optimized rau siv nrog streaming suab daim ntawv sau npe siv cov nqi qis tshaj xws li Internet Internet, cov kev pab cuam suab paj nruag, thiab lwm yam. Muaj ob lub tswv yim ntawm cov lus sib txuam no uas yog npe tau HE-AAC thiab HE-AAC V2. Qhov kho dua zaum ob ua siv ntau yam kev kho kom zoo dua qub thiab nws yog tus qauv ntau dua li thawj version (HE-AAC).
Txhawb nqa rau hom ntawv A-AAC
Hauv cov suab paj nruag digital, nws muaj ntau qhov piv txwv txog kev txhawb hom A-AAC li cas thiab siv. Cov no suav nrog:
- Software Media Players - Muaj ntau qhov kev hloov nyob hauv ntau hom kev siv software rau jukebox txhawb cov ntawv A-AAC. Piv txwv li, iTunes (version 9 thiab ntau dua) thiab Winamp (pro version) txhawb ob leeg HE-AAC encoding thiab seev suab. Txawm li cas los xij, ntau lwm cov kev pab cuam xws li Foobar2000, VLC Media Player, thiab lwm yam., Tsuas yog pab txhawb cov playback ntawm HE-AAC encoded audio files.
- Streaming Music Services - Cov suab paj nruag hauv online zoo li Pandora Radio thiab Rhapsody siv lub HE-AAC compression system kom nraaj zoo suab rau nws cov neeg siv. Siv HE-AAC, qhov kev siv bandwidth rau kev streaming yog heev tsawg dua rau lwm lub tshuab codec - tau suab yuav tsum tau xa raws li tsawg li 32 Kbps feem ntau.
- Internet Xov Tooj - Txij li ntawm HE-AAC yog txuag heev ntawm cov nqi qis, qhov kev sib txuam no yog qhov zoo rau cov xov tooj cua noj rau qhov webcast lawv tawm hauv cov sij hawm sib tw.
Tus Thawj Version ntawm HE-AAC
Cov neeg tsim ntawm HE-AAC, Coding Technologies , yog thawj tsim cov txheej txheem ntawm kev sib txuas los ntawm Integrating Spectral Band Replication (SBR) rau hauv AAC-LC (tsawg complex AAC) - lub npe ntawm lub tuam txhab siv CT-aacPlus. SBR (uas Coding Technologies kuj tsim) yog siv los txhawb cov suab los ntawm kev nraaj coding ntau dua. Lub tshuab coding li no, nws yog qhov tshwj xeeb tshaj yog rau streaming suab transmissions, ua haujlwm los ntawm reproducing dua frequencies los ntawm transposing sab qis - cov no yog muab cia ntawm 1.5 Kbps.
Hauv xyoo 2003 HE-AAC V1 tau pom zoo los ntawm MPEG lub koom haum thiab muab tso rau hauv lawv daim MPEG-4 raws li tus txheej txheem suab (ISO / IEC 14496-3: 2001 / Amd 1: 2003).
Tus thib ob Version ntawm HE-AAC
Nws-AAC V2 uas tau tsim los ntawm Coding Technologies yog ib qho kev ua kom zoo dua qub ntawm nws dhau los ntawm HE-AAC thiab tau lub npe hu ua lub tuam txhab ua Enhanced AAC +. Qhov kev kho thib ob no muaj xws li hu ua Parametric Stereo.
Raws li kev sib koom ua ke ntawm AAC-LC thiab SBR kom muaj txiaj ntsim zoo coding suab xws li hauv thawj kho dua ntawm HE-AAC, qhov thib ob version kuj muaj ib qho kev ntxiv hu ua, Parametrical Stereo - qhov no tsom rua qhov nquag nquag nrawm tawm suab. Tsis yog ua haujlwm ntau zaus xws li hauv SBR, Parametrical Stereo lub cuab yeej ua haujlwm los ntawm kev tsim cov lus qhia txog qhov txawv ntawm sab laug thiab sab xis. Cov lus qhia ntawm no yuav siv tau los piav qhia txog qhov kev sib txuam ntawm cov duab hauv lub HE-AAC V2 raws audio file. Thaum tus cim tau siv cov ncauj lus tseem ceeb ntxiv, lub tso suab yuav ua tau rau siab (thiab muaj txiaj ntsig) kev luam tawm hauv kev ua si thaum ua qhov kev cia siab ntawm qhov streaming suab kom tsawg.
Nws-AAC V2 kuj muaj lwm yam khoom siv suab hauv nws lub cuab yeej cuab tam xws li downmixing tso cai rau mono, yuam kev zais, thiab spline resampling. Vim nws pom zoo los ntawm MPEG lub koom haum xyoo 2006 (raws li ISO / IEC 14496-3: 2005 / Amd 2: 2006), nws tau muaj lub npe hu ua HE-AAC V2, aacPlus v2, thiab eAAC +.
Kuj tseem paub zoo li: aac +, CT-HE-AAC, eAAC
Lwm Txoj Kev Hais Tias: CT-aacPlus