AAC ntaub ntawv: Yuav ua li cas yog AAC Format? zoo tshaj plaws tej chaw rau High AAC Quality?

Yog AAC zoo dua MP3?

AAC yog tsim raws li ib tug successor ntawm MP3. Ob MP3 thiab AAC yog lossy compression ntaub ntawv tawm tswv yim, thiab tag nrho lawv muaj lawv txoj hauj lwm zoo thiab demerits. Piv txwv li, AAC muaj ib tug high suab zoo piv rau MP3, thiab nws tseem yog me me. MP3, rau lwm cov tes, yog xav paub ntau tshaj tshaj tawm players thiab pab kiag li lawm tshaj AAC. Yog hais tias koj noj tag nrho tej yam uas mus rau hauv kev saib xyuas, nws yog ib qho nyuaj rau txiav txim uas hom ntawv yog zoo dua rau lwm yam. Txawm li cas los, Yog hais tias koj tab tom nrhiav rau lub suab zoo sijhawm thiab tej ntaub ntawv loj, ces AAC yog qhov zoo tshaj plaws cov ntaub ntawv rau koj. MP3 yog zoo thaum twg yog xav compatibility teeb meem.

• Part 1. Yuav ua li cas yog AAC File? Thiab evolution ntawm AAC Format?
• Part 2. AAC-LC vs NWS-AAC: Yuav ua li cas yog AAC-LC / NWS-AAC thiab Differences?
• Part 3. Qhov zoo tshaj plaws Chaw rau AAC hom
• Part 4. AAC codec Pom zoo
• Part 5. Qhov zoo tshaj plaws AAC Converter

Part 1. Yuav ua li cas yog AAC File? Thiab evolution ntawm AAC Format?

# 1. AAC hom:

AAC uas yog ib tug luv luv daim ntawv rau Advanced Suab Coding hais txog ib tug caag, lossy compression thiab encoding system rau cov suab. Nws yog tsim tau los ua tus successor ntawm lub MP3 hom ntawv. Thaum encoded at zoo xws li cov bitrates, AAC achieves zoo suab zoo tshaj MP3. AAC twb tsim muaj tus pab tuam txhab uas muag xws li Fraunhofer IIS, Dolby Laboratories, AT & T TSWB Laboratories, Nokia thiab Sony Corporation. Nyob rau hauv 1997, nws tau tshaj tawm hais tias ib tug thoob ntiaj teb txuj los ntawm cov Tsiv Duab Kws txawj Group. Nws yog teev raws li ib feem 7 ntawm MPEG-2 standard, thiab subpart 4 ntawm ib feem 3 nyob rau hauv lub MPEG-4 txheem. Txoj kev loj hlob thiab evolution ntawm AAC muaj xws li sib txawv nta xws li AAC 2.0 uas yog tus version 2 ntawm AAC uas yog raws li nyob rau hauv SBR, thiab parametric tso suab coding cov cuab yeej nyob rau hauv lub MPEG-4 Lub standard.

# 2. AAC SBR:

AAC SBR li siv nyob rau hauv txoj kev loj hlob ntawm AAC suab hom yog hais txog Spectral Band replication nyob rau hauv tag nrho. Nws yog ib tug technology siv lug txhim khu suab codecs, tshwj xeeb yog nyob rau hauv tsis muaj bitrates.

# 3. AAC tso suab:

AAC tso suab nyob rau hauv txoj kev loj hlob ntawm AAC yog cov qauv ntawm cov suab tu tub tu kiv uas ntaub ntawv ib tug illusion ntawm multi-directional audible foundations. Nws yog tiav los ntawm kev siv ntawm ob los yog ntau tshaj ywj siab suab raws. AAC 5.1 yog tus txheej txheem rau broadcasts suab nyob rau hauv AAC suab. Ntsig, AAC ADTS (Audio ntaub ntawv Thauj kwj) yog ib hom siv los ntawm lub MPEG-TS rau kwj AAC suab.

Part 2. AAC-LC vs NWS-AAC

# 1. NWS-AAC:

NWS-AAC hais txog High-Efficiency Advanced Suab Coding. Nws yog ib qho suab coding hom ntawv rau cov lossy cov ntaub ntawv compression ntawm cov suab. Nws yog txhais raws li MPEG-4 suab profile nyob rau hauv IEC / ISO 14496-3. Lub coding yog ib tug extension ntawm AAC LC thiab yog qhov zoo rau cov uas tsis bitrates.

# 2. AAC-LC:

AAC-LC hais txog lub Tsawg Complexity AAC. Nws yog feem ntau optimized rau siab bitrates. LC muaj ntawm ib lub hauv paus hom uas yog zoo li lub AT thiab T lub foundations Suab Coding (PAC) hom ntawv thiab cov sab nqaij daim tawv nrov Shaping.

# 3. Differnces Ntawm NWS-AAC thiab AAC-LC:

1. NWS-AAC yog zoo rau cov uas tsis bitrates xws li 80kbps thiab hauv qab no thaum AAC LC yog optimized rau siab bitrates xws li 90kbps thiab saum toj no. Nyob rau hauv cov ntaub ntawv uas, NWS-AAC yog zoo dua yog hais tias koj npaj rau ua si cov ntaub ntawv nyob rau hauv lub computer siv ib tug tau tshaj software los yog thaum encoding thaum uas tsis muaj bitrates. Nyob rau lwm cov tes, LC-AAC yog haum rau kev kho vajtse kev pab txhawb thiab encoding nyob rau high school bitrates xws li 90kbps thiab saum toj no.
2. LC-AAC spares koj cov roj teeb them nyiaj yog nyob rau hauv koj lub tsheb los yog koj mobile ntaus ntawv thaum lub sij hawm nws-AAC tshev koj cov roj teeb yooj yim heev.
3. Cov NWS-AAC v1 suab zoo ntawm 64 kb / s yog zoo li AAC-LC ntawm 96 kb / s.

Part 3. Qhov zoo tshaj plaws Chaw rau AAC hom

Ntsis Rate: 320kbps los yog siab dua rau cov 2 raws (ib tug ntau dua bitrate yog ib txwm zoo, txawm li cas los, 256 kbps kuj siv tau thiab).

Qauv Rate: 44.1Khz

Raws: 2 (tso suab)

Part 4. AAC codec Pom zoo

# 1. AAC-LC:

AAC hais txog qhov uas tsis muaj complexity AAC. Nws txhawb rau mono / tso suab / 5.0 / 5.1 ntsiab lus uas txheem zauv nqi ntawm 8 rau 48 kHz.

Txhawb kev OS: Hauv 4.1+, Qhov rai 8 xov tooj nrog processor MSM8x27, MSM8x30, MSM8960 thiab MSM8974
Txhawb Thawv: 3GP, 3G2, MP4, M4A, MPR, AAC

# 2. NWS-AACv1 (AAC +):

Qhov no codec stands rau HE- AAC version 1 profile. Lub codec siv lub Spectral Band replication (SBR) lug txhim khu cov compression efficiency nyob rau hauv lub zaus sau. Nws txhawb lub mono / tso suab / 5.0 / 5.1 ntsiab lus uas txheem zauv nqi ntawm 8 rau 48 kHz.

Txhawb kev OS: Hauv 4.1+, Qhov rai 8 xov tooj nrog processor MSM8x27, MSM8x30, MSM8960 thiab MSM8974
Txhawb Thawv: 3GP, 3G2, MP4, M4A, AAC

# 3. NWS-AACv2 (enhanced AAC +):

Qhov no yog HE- AAC version 2 profile thiab nws koom SBR nrog parametric tso suab (PS) los txhawb compression efficiency ntawm lub tso suab Pib ntsais koj teeb. Cov version no yog ib qho kev txhim kho thiab ib tug qauv version rau AAC plus. Nws txhawb lub tso suab / 5.0 / 5.1 ntsiab lus uas txheem zauv nqi ntawm 8 rau 48 kHz.

Txhawb kev OS: Hauv 4.1+, Qhov rai 8 xov tooj nrog processor MSM8x27, MSM8x30, MSM8960 thiab MSM8974
Txhawb Thawv: 3GP, 3G2, MP4, M4A, AAC

# 4. AAC-ELD (enhanced tsawg ncua AAC):

Tsis tas li ntawd lub npe hu ua lub MPEG-4 Tsawg Ncua Suab coder. Nws combines qhov zoo ntawm cov foundations suab coding nrog ib tug tsawg ncua los txhim kho ob-txoj kev sib txuas lus. Nws muaj kev txhawb rau cov mono thiab tso suab ntsiab lus uas txheem zauv nqi ntawm 16 mus rau 48 kHz.

Txhawb kev OS: Hauv 4.1+
Txhawb Thawv: 3GPP (.3gp), MPEG-4 (.mp4, .m4a), MPEG-TS

# 5. AAC-HEv2:

Kev them nyiaj yug rau mono los yog lub tso suab ntsiab lus uas txheem zauv nqi ntawm 16 mus rau 48 kHz.

Txhawb kev OS: Hauv 4.1+
Txhawb Thawv: 3GPP (.3gp), MPEG-4 (.mp4, .m4a)

Part 5. Qhov zoo tshaj plaws AAC Converter

UniConverter yog tus loj tshaj tshuaj rau tag nrho cov video thiab audio hloov dua siab tshiab zog. Nws txhawb hloov dua siab tshiab ntawm ntau tshaj 150 cov ntaub ntawv tawm tswv nrog cov tshiab sawv daws yuav tau ntxiv nrog cov tshiab hloov dua tshiab. Yog hais tias koj xav hloov tej ntaub ntawv, koj yuav ua raws li peb yam yooj yim cov kauj ruam thiab tau txais ib hom ntawv uas yog tus phooj ywg rau koj media player. Lub AAC Converter tej yam koj cov ntaub ntawv tsis muaj cov teeb liab ntsais qhov zoo tshaj ntawm koj cov ntaub ntawv, thiab koj yuav hloov ncaj qha mus rau tus ntaus ntawv hom ntawv los ntawm kev xaiv cov ntaus ntawv hom raws li qhov tso zis hom ntawm AAC. Koj yeej tseem nruab no AAC Converter rau koj lub qhov rais PC los sis Mac computer los xaiv lub version txhawb los ntawm koj lub computer operating system. Hloov dua siab tshiab ceev no kuj sai, thiab koj yuav hloov ntau yam ntawm cov ntaub ntawv ntawm ib tug mus.