Jun 21,2017 14:50 pm / lo rau ntawm Brian Fisher mus hloov suab
Yog AAC zoo tshaj MP3?
AAC yog tsim raws li tus successor hauv MP3. MP3 thiab AAC yog lossy compression tej ntaub ntawv tawm tswv yim, thiab lawv sawvdaws hais lawv yuav pab lawd tog thiab demerits. Piv txwv li, AAC tau lub suab zoo piv rau MP3, thiab tseem me me. MP3, ntawm qhov tod tes, yuav ntau tau tshaj tawm players ntau thiab li tshaj AAC. Yog koj noj txhua yam rau tus saib xyuas, koj yuav tsis los txiav txim seb hom ntawv twg yog cov uas yuav zoo tshaj tug. Tiam sis, yog hais tias koj tab tom nrhiav sijhawm suab zoo thiab raws li cov ntaub ntawv, ces AAC yog cov ntaub ntawv uas zoo tshaj rau koj. MP3 yog zoo thaum twg yog xav txog tej teeb meem compatibility.
- Qhov 1. Evolution AAC File? thiab cov AAC Format? yog dab tsi
- Qhov 2. AAC LC vs nws-AAC: AAC-LC/nws-AAC thiab Differences? tus
- Qhov 3. Zoo tshaj qhov rau hom ntawv AAC
- Qhov 4. AAC Codec muab kev pom zoo
- Qhov 5. Zoo tshaj Converter AAC
Qhov 1. Evolution AAC File? thiab cov AAC Format? yog dab tsi
#1. Hom ntawv AAC:
Yog ib daim ntawv me ntsis rau lawm lub Coding AAC zej ib caag, lossy compression thiab encoding lawv rau cov suab. Nws yog tsim tau lub successor ntawm qhov MP3 hom ntawv. Thaum encoded nyob zoo bitrates, AAC achieves zoo suab zoo dua MP3. AAC thaiv)(VICP) nrog lub tshab ntawm tuam txhab uas muag xws li Fraunhofer IIS, Dolby Laboratories, saib & lub chaw soj nstuam T BELL, Nokia thiab Sony Corporation. Thaum 1997, nws yog tus me tus tseev tsim ntiaj teb txuj raws cov duab Avenues ua hauj lwm pab pawg. Nws teev raws li Tshooj 7 MPEG-2 txuj, thiab subpart 4 ntawm Tshooj 3 nyob hauv tus txheej txheem MPEG-4. Txoj kev loj hlob thiab evolution ntawm AAC qhia txawv nta xws li AAC 2.0 tub uas yog cov version 2 ntawm AAC uas raws li SBR, thiab parametric lub tso suab coding lwm yam cuab yeej hauv lub MPEG-4 suab txheem.
#2. AAC SBR:
AAC SBR raws li tau siv nyob rau txoj kev AAC lub hom ntawv hais txog cov Spectral Band Replication tag nro. Nws yog ib lub tshuab uas siv lug txhim khu lub codecs, tshwj xeeb tshaj yog rau bitrates uas tsis muaj.
#3. Tso suab AAC:
Tso suab AAC nthuav kev AAC yog peb lub suab tu tub tu kiv uas ib illusion ntawm txuj kev ncau ntau directional audible foundations. Nws yog tiav lwm ob los sis ntau tshaj yus lub raws. AAC 5.1 yog tus txheej txheem rau broadcasts AAC suab suab nrov. Ntsig, AAC ADTS (suab ntawv thauj kwj) yog ib hom ntaub ntawm lub MPEG-TS cub AAC suab.
Qhov 2. AAC LC vs nws-AAC
#1. NWS-AAC:
NWS-AAC zej High Efficiency Advanced suab Coding. Nws yog ib suab coding hom ntawv rau lossy tej ntaub ntawv compression rau cov suab. Nws txhais tias yog cov MPEG-4 suab profile hauv IEC/ISO 14496-3. Tus coding no mus ntxiv ntawm AAC LC thiab optimized rau cov uas tsis muaj bitrates.
#2. AAC-LC:
AAC LC hais txog lub qes Complexity AAC. Nws yog feem coob optimized rau siab bitrates. LC comprises ntawm ib hom ntawv luj uas yog tus saib thiab tus T foundations suab Coding (PAC) hom thiab cov Temporal nrov Shaping.
#3. Differnces thaum nws-AAC AAC-LC:
1. nws-AAC yog zoo tsis bitrates xws li 80 kbps thiab hauv qab thaum AAC LC optimized rau bitrates siab xws li 90 kbps thiab nyob saum toj no. Ua li ntawd, nws-AAC yog ib qho zoo yog koj yeej npaj rau ua cov ntaub ntawv siv lub computer siv ib software tau tshaj los yog thaum encoding thaum uas tsis muaj bitrates. Ntawm qhov kev tes, LC-AAC yog tsim rau kev them nyiaj yug kho vajtse thiab encoding nyob bitrates siab xws li 90 kbps thiab nyob saum toj no.
2. LC-AAC spares koj roj teeb xwb yog koj lub tsheb los yog koj ntaus mobile thaum nws-AAC tshev koj roj teeb yooj yim heev.
3. nws-AAC v1 suab zoo rau 64 kb/s yeej zoo xws AAC-LC hauv 96 kb/s.
Qhov 3. Zoo tshaj qhov rau hom ntawv AAC
Tus nqi ntsis: 320 kbps lossis siab dua ntawd rau 2 raws (ib bitrate dua lawm yeej yuav zoo, tab sis, 256 kbps tseem xam).
Tus nqi coj mus kuaj: 44.1 Khz
Raws: 2(stereo)
Qhov 4. AAC Codec muab kev pom zoo
#1. AAC-LC:
AAC hais txog qhov uas tsis muaj complexity AAC. Nws txhawb rau cov txheej txheem qauv rau ntawm 8 rau 48 kHz mono/stereo/5.0/5.1.
Txaus siab OS: Hauv 4.1 +, qhov rais 8 hu xov tooj nrog processor MSM8x27, MSM8x30, MSM8960 thiab MSM8974
Txaus siab thawv: 3GP, 3G 2, MP4, M4A, MPR, AAC
#2. NWS-AACv1 (AAC +):
No codec stands rau nws - AAC version 1 profile. Cov codec utilizes tus Spectral Band Replication (SBR) yuav txhim khu lub efficiency compression hauv lub zaus sau. Nws txhawb cov txheej txheem qauv rau ntawm 8 rau 48 kHz mono/stereo/5.0/5.1.
Txaus siab OS: Hauv 4.1 +, qhov rais 8 hu xov tooj nrog processor MSM8x27, MSM8x30, MSM8960 thiab MSM8974
Txaus siab thawv: 3GP, 3G 2, MP4, M4A, AAC
#3. NWS-AACv2 (enhanced AAC +):
Qhov no yog nws - AAC version 2 profile thiab nws joins SBR nrog Parametric tso suab (PS) yuav txhawb compression efficiency ntawm lub tso suab pib ntsais koj teeb. Tus version yog ib txoj kev txhim kho thiab ib caag version rau AAC plus. Nws txhawb stereo/5.0/5.1 txheej txheem qauv rau ntawm 8 rau 48 kHz.
Txaus siab OS: Hauv 4.1 +, qhov rais 8 hu xov tooj nrog processor MSM8x27, MSM8x30, MSM8960 thiab MSM8974
Txaus siab thawv: 3GP, 3G 2, MP4, M4A, AAC
#4. AAC-Aaskiv "ELD" (enhanced tsis qeeb AAC):
Los yog lub MPEG-4 qes qeeb suab Coder. Nws combines tau qhov zoo ntawm foundations lub coding uas tsis ncua sij hawm kom muaj kev sib txuas lus two-way. Nws muaj kev them nyiaj yug rau ntawv mono thiab lub tso suab uas muaj nqi zauv txheem ntawm 16 rau 48 kHz.
Txaus siab OS: Hauv 4.1 +
Txaus siab thawv: 3GPP (.3gp), MPEG-4 (.mp4, .m4a), MPEG-TS
#5. AAC-HEv2:
Kev them nyiaj yug rau ntawv mono lossis lub tso suab uas txheem qauv rau ntawm 16 rau 48 kHz.
Txaus siab OS: Hauv 4.1 +
Txaus siab thawv: 3GPP (.3gp), MPEG-4 (.mp4, .m4a)
Qhov 5. Zoo tshaj Converter AAC
UniConverter yog cov tshuaj tag nrho conversion video thiab lub zog loj tshaj. Nws txhawb conversion ntawm tshaj 150 daim ntawv tawm tswv yim nrog thoj ones ntxiv nrog cov tshiab ntawv kom ruaj. Yog koj xav siv tau cov ntaub ntawv, koj yuav ua raws li 3 kauj ruam yooj yooj yim thiab tau ib hom ntawv uas yog tus phooj ywg rau koj tawm neeg uas ua ntawv. Tus AAC Converter yam koj cov ntaub ntawv tsis muaj tus zoo koj cov ntaub ntawv, thiab koj yuav siv tau ncaj qha mus rau hom ntawv ntaus los xaiv tus ntaus yam li lub tso zis ntau hom ntawv ntawm AAC. Koj yeej tseem nruab no AAC Converter koj qhov rais PC los lub computer Mac uas xaiv tau tus raws li koj lub computer operating system version. Tus conversion ceev tseem ceev, thiab koj yuav siv tau ntau yam ntaub ntawv ntawm ib tug mus.
UniConverter - Converter yees duab
- Batch AAC Converter nrog hauv lub nruab nrog ces los ntawm ntau yam ntaub ntawv tshaj 150 yees duab thiab lub hom converting ib zaug.
- Converter ceev tshaj mob ceev 90 X sai dua lwm cov converters tsaug txawm hardware thiab cov hom kev kawm Intel.
- Inbuilt editing cov cuab yeej pab txia ua lub chaw ntawm koj tej ntaub ntawv rau cov zis rau lub specs dua.
- Sab hauv video downloader ua txhawb tau yooj yim dua ces yeeb yaj duab thiab cov tsos ntawm 1000 ntau tshaj no.
- DVD vam los pab luam, hlawv, thaub qab, thiab siv cov ntsiab lus DVD.
- Video recorder uas txhawb cov ntaubntawv povthawj siv cov yeeb yaj duab ntawm cov Web sites streaming xws li YouTube, Instagram, Facebook thiab ntau lwm tus.
