Kuyamba kwa HE-AAC
HE-AAC (yomwe nthawi zambiri imatchedwa aacPlus ) ndiyo njira yowonongeka ya audio yadijito ndipo ndi yochepa kwa High Efficiency Advanced Audio Encoding. Zokonzedweratu zogwiritsidwa ntchito pogwiritsa ntchito mauthenga omvera omwe amafunika monga Intaneti, masewera olimbitsa nyimbo, ndi zina zotere. Panopa pali magawo awiri a ndondomekoyi yomwe ikufotokozedwa monga HE-AAC ndi HE-AAC V2. Kukonzanso kwachiwiri kumagwiritsa ntchito zida zowonjezereka kwambiri ndipo zimakhala zovomerezeka kuposa zoyambirira (HE-AAC).
Thandizo kwa Format HE-AAC
Mu nyimbo zamagetsi, pali zitsanzo zambiri za momwe machitidwe a HE-AAC amathandizidwira ndikugwiritsidwa ntchito. Izi zikuphatikizapo:
- Software Media Players - Pali kusiyana kwakukulu momwe mawonekedwe a jukebox software akuthandizira maonekedwe a HE-AAC. Mwachitsanzo, iTunes (vesi 9 ndi apamwamba) ndi Winamp (pro pro) zimathandizira onse a HE-AAC kukodola ndi kutanthauzira. Komabe, mapulogalamu ena ambiri otchuka monga Foobar2000, VLC Media Player, ndi zina zotero, amathandizira kusewera kwa mafayilo omvera a HE-AAC.
- Mapulogalamu Akumasulira Akusindikiza - Mawonekedwe a nyimbo pa intaneti monga Pandora Radio ndi Rhapsody amagwiritsa ntchito njira ya compressed HE-AAC kuti iwonetsere bwino mafilimu apamwamba kwambiri kwa ogwiritsa ntchito. Pogwiritsira ntchito HE-AAC, kufunika kwapakati pafupipafupi kumakhala kochepa kwambiri kusiyana ndi machitidwe ena a codec - audio yovomerezeka imatha kuperekedwa ngati 32 Kbps nthawi zambiri.
- Internet Radio - Popeza HE-AAC ikugwira bwino kwambiri pang'onopang'ono, dongosolo ili loyendetsa bwino ndilopangitsa kuti ma wailesi awonetsedwe pa nthawi yeniyeni.
Baibulo Loyamba la HE-AAC
Okonzanso a HE-AAC, Coding Technologies , poyamba adayambitsa dongosolo lopanikizika pogwiritsa ntchito Spectral Band Replication (SBR) ku AAC-LC (zovuta zovuta AAC) - dzina la malonda omwe kampani amagwiritsa ntchito ndi CT-aacPlus. SBR (yomwe Coding Technologies inakonzedwanso) imagwiritsidwa ntchito kupititsa patsogolo mauthenga omvetsera ndi kulembetsa maulendo apamwamba. Makina opanga makinawa, omwe ndi abwino kwambiri kusindikiza mauthenga a mawu, amagwira ntchito popanga maulendo apamwamba powasintha m'munsi - awa amasungidwa ku 1.5 Kbps.
Mu 2003 HE-AAC V1 inavomerezedwa ndi bungwe la MPEG ndipo linaphatikizapo chikalata chawo cha MPEG-4 monga mawu omveka (ISO / IEC 14496-3: 2001 / Amd 1: 2003).
Baibulo lachiwiri la HE-AAC
HE-AAC V2 yomwe idakonzedwanso ndi Coding Technologies ndiwowonjezereka wa HE-AAC wotulutsidwa kale ndipo idatchulidwa mwachindunji ndi kampani monga Enhanced AAC +. Kukonzanso kwachiwiri kumeneku kumaphatikizapo chitukuko chotchedwa Parametric Stereo.
Kuphatikizanso ndi kuphatikiza kwa AAC-LC ndi SBR popanga mauthenga omveka bwino monga momwe akuyambitsiranso za HE-AAC, kachiwiri kachiwiri kachiwiri kali ndi chida chowonjezera chotchedwa Parametric Stereo - ichi chimagwiritsira ntchito bwino kupanikiza zizindikiro za stereo. M'malo mogwira ntchito pafupipafupi monga momwe zinalili ndi SBR, chida cha Parametric Stereo chimagwira ntchito popanga mauthenga pambali pa kusiyana pakati pa njira zamanzere ndi zoyenera. Zomwe zili kumbaliyi zingagwiritsidwe ntchito pofotokozera zofunikira zazithunzi za stereo mu fayilo ya audio ya HE-AAC V2. Pamene a decoder amagwiritsa ntchito zidziwitso zapakati pa malo, stereo ikhoza kukhala yokhulupirika (ndipo mwachangu) imabweretsedwanso panthawi yomwe imasewera pamene mukusunga bitrate ya audio kusakasa.
HE-AAC V2 imakhalanso ndi zowonjezera zowonjezera zamakono m'bokosi la zida zomwe zimagwiritsira ntchito downmixing stereo kwa mono, kubisala, ndi kupewera msampha. Kuchokera pa kuvomereza kwake ndi kukhazikitsidwa kwa bungwe la MPEG mu 2006 (monga ISO / IEC 14496-3: 2005 / Amd 2: 2006), amadziwika kuti HE-AAC V2, aACPlus v2, ndi eAAC +.
Komanso amadziwika monga: aac +, CT-HE-AAC, eAAC
Zolemba Zina: CT-aacPlus