Isingeniso ku-HE-AAC
I-HE-AAC (okuvame ukubizwa ngokuthi i- aacPlus ) uhlelo lokunciphisa ukulahlekelwa komsindo wedijithali futhi kufushane ku-High Efficiency Encoding Advanced Audio. Ilungiselelwe ukusetshenziswa ngokusakaza izinhlelo zokusebenza zomsindo lapho kudingeka khona ama-rate amancane njenge-Inthanethi Radio, izinsizakalo zomculo ezithuthukisiwe, njll. Kukhona izinguqulo ezimbili zalolu hlelo lokucindezela olufakwe njenge-HE-AAC ne-HE-AAC V2. Ukubukezwa kwesibili kusebenzisa izici ezithuthukisiwe kakhulu futhi kufaniswe ngaphezulu kunezinguqulo zokuqala (HE-AAC).
Ukusekela ifomethi ye-HE-AAC
Emculweni wedijithali, kunezibonelo eziningana zokuthi ifomethi ye-HE-AAC isekelwe futhi isetshenziswa kanjani. Lokhu kufaka:
- I-Software Media Players - Kunokuhlukahluka kakhulu ukuthi izinhlelo zokusebenza ze-jukebox zezinhlelo ezahlukene zisekela kanjani ifomethi ye-HE-AAC. Isibonelo, i-iTunes (inguqulo 9 nangaphezulu) kanye neWinamp (version pro) isekela kokubili ikhodi ye-HE-AAC nokucubungula. Noma kunjalo, ezinye izinhlelo eziningi ezithandwayo ezifana ne-Foobar2000, i-VLC Media Player, njll, zisekela kuphela ukudlala kwamafayela womsindo we-HE-AAC.
- Izinsiza zomculo zokusakaza - Amasevisi omculo e-intanethi afana ne- Pandora Radio neRhapsody isebenzisa uhlelo lwe-HE-AAC lokunciphisa ukuhambisa umsindo ophezulu wekhwalithi kubasebenzisi bayo. Ukusebenzisa i-HE-AAC, isidingo sokuhamba komkhawulokudonsa singaphansi kakhulu kunezinye izinhlelo ze- codec - umsindo owemukelekayo ungathunyelwa ngezinga eliphansi njenge-32 Kbps ezimweni eziningi.
- Umsakazo we-intanethi - Njengoba i-HE-AAC iphumelela kakhulu kumazinga aphansi, lolu hlelo lokucindezela lungcono iziteshi zomsakazo ukuze zisakaze ukusakaza kwazo ngesikhathi sangempela.
I-First Version ye-HE-AAC
Abathuthukisi be-HE-AAC, i- Coding Technologies , baqala ukudala uhlelo lokucindezela ngokuhlanganisa i-Spectral Band Replication (SBR) ibe yi- AAC-LC (ephansi ukuhlanganiswa kwe-AAC) - igama lebhizinisi lenkampani esebenzisa i-CT-aacPlus. I-SBR (yiyiphi i-Coding Technologies eyasungulwa) isetshenziselwa ukuthuthukisa umsindo ngokubhala ama-frequencies aphakeme kakhulu. Lokhu ubuchwepheshe bokuthuthukisa ikhodi, obuhle ikakhulukazi ekuthumeleni ukuthunyelwa kwezwi, kusebenza ngokukhiqiza amazinga aphezulu ngokudlulisa okuphansi - lezi zigcinwe ku-1.5 Kbps.
Ngo-2003 I-HE-AAC V1 yamukelwa yinhlangano ye-MPEG futhi ifakwe kumqulu wabo we-MPEG-4 njengendlela evamile yokulalelwayo (ISO / IEC 14496-3: 2001 / Amd 1: 2003).
Inguqulo yesibili ye-HE-AAC
I-HE-AAC V2 eyabuye yasungulwa yi-Coding Technologies yinguqulo ethuthukisiwe ye-HE-AAC ekhishwe ngaphambilini futhi yaqanjwa ngokusemthethweni yinkampani njenge-Enhanced AAC +. Lokhu kubuyekezwa kwesibili kuhlanganisa ukuthuthukiswa okubizwa nge-Parametric Stereo.
Kanye nenhlanganisela ye-AAC-LC ne-SBR yokubhala ngokucophelela umsindo njengokubukezwa kokuqala kwe-HE-AAC, le nguqulo yesibili nayo ithuluzi elengeziwe elibizwa ngokuthi, i-Parametric Stereo - lokhu kugxile ekucindezeleni ngokuphumelelayo amasignali we-stereo. Esikhundleni sokusebenza ku-spectrum ye-frequency njengokwesimo se-SBR, ithuluzi le-Parametric Stereo lisebenza ngokudala ukwaziswa okuhlangene mayelana nokwahlukana phakathi kweziteshi ezingakwesokunxele nezingakwesokudla. Lolu lwazi oluhlangothini lungasetshenziselwa ukuchaza ilungiselelo elincane lesithombe se-stereo kufayela le-audio-HE-AAC V2 esekelwe. Uma i-decoder isebenzisa lolu lwazi oluthe xaxa, i-stereo ingaba ngokwethembeka (futhi ngokuphumelelayo) iphinde ikhiqizwe ngesikhathi sokudlala ngenkathi igcina i-bitrate yomsindo wokusakazwa okungenani.
I-HE-AAC V2 nayo inezinye izithuthukisi zomsindo ebhokisini lamathuluzi lazo njenge-downmixing stereo kuya ku-mono, ukufihlwa kwephutha, kanye nokuphinda kushintshwe okwehla. Kusukela ukuvunyelwa kwayo kanye nokulinganiselwa yinhlangano ye-MPEG ngo-2006 (njengo-ISO / IEC 14496-3: 2005 / Amd 2: 2006), sekubizwa ngokuthi i-HE-AAC V2, aacPlus v2, ne-eAAC +.
Futhi yaziwa ngokuthi: aac +, CT-HE-AAC, eAAC
Ezinye izipelingi: CT-aacPlus