Intshayelelo kwi-HE-AAC
I-HE-AAC (edlalwa ngokuba yi- acaclus ) yinkqubo yokunciphisa i-digital audio kwaye ifutshane kwi-Advanced Efficiency Encoding Advanced Audio. Yilungiselelwe ukuba isebenzise kunye nezicelo zomsindo ogqithisiweyo apho iifayile eziphantsi ezifunekayo ezifana ne-intanethi ye-Intanethi, iinkonzo zomculo ezithungelwano, njl. Kukho iinguqulelo ezimbini zezicwangciso zenkcenkcazo ezichazwe njenge-HE-AAC kunye ne-HE-AAC V2. Uhlaziyo lwesibini lusebenzisa izixhobo eziphuculiweyo kwaye zilungelelaniswa ngaphezu kohlobo lokuqala (HE-AAC).
Inkxaso yeFET-AAC Ifomethi
Ngomculo wedijithali, kukho imizekelo emininzi yokwakheka kwefomathi ye-HE-AAC kwaye isetyenziswe. Ezi ziquka:
- I-Software Media Players - Kukho utshintsho kwiindlela ezahlukeneyo zezicelo zesofthiwe ze jukebox ezixhasa ifomathi ye-HE-AAC. Ngokomzekelo, i-iTunes (inguqulelo 9 nangaphezulu) kunye neWinamp (pro version) inkxaso inkxaso ye-HE-AAC kunye nokuqulunqa. Nangona kunjalo, ezinye iinkqubo ezininzi ezidumile ezifana neFoobar2000, iVLC Media Player, njl., Zixhasa kuphela ukudlala kweefayili zomsindo ze-HE-AAC.
- IiNkonzo zoMculo zokusasaza - Iinkonzo zomculo ezifumaneka kwi- Intanethi njenge- Pandora Radio kunye neRhapsody zisebenzisa inkqubo ye-HE-AAC yokunciphisa ukusabalalisa ngokugqithiseleyo umsindo ophezulu kwi-abasebenzisi bayo. Ukusebenzisa i-HE-AAC, imfuno yomda we-bandwidth yokusasaza ininzi kakhulu kunezinye iinkqubo ze- codec - umsindo owamkelekileyo ungathunyelwa ngaphantsi kwe-32 Kbps kwiimeko ezininzi.
- I-intanethi ye-intanethi - Njengoko i-HE-AAC isebenza kakuhle kwizinga elincinane, le nkqubo yenkxalabo ifanelekile kwizikhululo zomsakazo ukuba zifakwe kwi-intanethi kwi-real-time.
I-First Version ye-HE-AAC
Abaphuhlisi be-HE-AAC, i- Coding Technologies , baqala ukudala inkqubo yoxinzelelo ngokudibanisa i-Spectral Band Replication (SBR) kwi- AAC-LC (i-Compact AAC complex) - igama loshishino elisebenzisayo yi-CT-aacPlus. I-SBR (i-Coding Technologies eyenziwa ngayo nayo) isetyenziselwa ukuphucula i-audio ngokucwangcisa ngokufanelekileyo iifom ephezulu. Le teknoloji yokuphuculwa kweteknoloji, eyona nto ibaluleke kakhulu ekuthungeni i-voice voice transmissions, isebenza ngokuvelisa iifom ephezulu ngokutshintshwa kwezantsi-ezi zigcinwe kwi-1.5 Kbps.
Ngo-2003 i-HE-AAC V1 ivunyiwe yi-MPEG kwaye iqulethwe kumqulu wayo we-MPEG-4 njengomgangatho ovakalayo (ISO / IEC 14496-3: 2001 / Amd 1: 2003).
INguqulelo yesiBini ye-HE-AAC
I-HE-AAC V2 eyaphuhliswa kwakhona yiCoding Technologies yinguqulo ephuculweyo ye-HE-AAC eyayikhululwe ngaphambili kwaye yabizwa ngokusemthethweni yinkampani njenge-Enhanced AAC +. Olu hlaziyo lwesibili luquka ukuphuculwa okubizwa ngokuba yiParametric Stereo.
Kanye kunye nokuhlanganiswa kwe-AAC-LC kunye ne-SBR ukwenzela ukuba i-audio-coding audio ifumaneke ngokutsha njengendlela yokuqala yokuhlaziywa kwe-HE-AAC, le ngcaciso yesibili inesixhobo esongeziweyo esibizwa ngokuba yi-Parametric Stereo-oku kugxininisekisa ngokufanelekileyo ukusebenza kweempawu zesiterefti. Esikhundleni sokusebenza kwi-spectrum ebonakalayo kwimeko ye-SBR, ithuluzi le-Parametric Stereo lisebenza ngokudala ulwazi malunga nolwahlukileyo phakathi kweendlela ezisekhohlo kunye nezisekunene. Le ngcaciso ecaleni ingasetyenziselwa ukuchaza ilungiselelo elithile lomfanekiso wesiterefti kwifayile ye-HE-AAC V2 esekelwe kwifayile. Xa i-decoder isebenzisa le ngcaciso eyongezelelweyo yendawo, i-stereo inokuthenjwa (kwaye ngokufanelekileyo) iphinda ikhiqizwe ngexesha lokudlala ngelixa igcina i-bitrate yomsindo wokusakaza kwi-minimum.
I-HE-AAC V2 nayo inezinye izithuthukisi zomsindo kwibhokisi yayo yeebhokisi ezifana nokuxilisa i-stereo kwi-mono, ukufihlwa kwephutha, kunye nokuhlaziywa kwe-spline. Ukususela ekuvunyweni kwayo kunye nemigangatho yenkampani ye-MPEG ngo-2006 (njenge-ISO / IEC 14496-3: 2005 / Amd 2: 2006), iyaziwa ngokuba yi-HE-AAC V2, aacPlus v2, kunye ne-eAAC +.
Kwaziwa nangokuthi: aac +, CT-HE-AAC, eAAC
Ezinye iipellings: CT-aacPlus