Nrog lub tswv yim ntawm cov cuab yeej cuab tam hauv lub ntiaj teb ntawm cov suab paj nruag, muaj ib lo lus nug hais txog qhov kev xaiv ntawm txoj kev rau digitizing, ua thiab khaws cia suab. Muaj ntau hom qauv tau tsim, feem ntau yog cov tseem siv tau zoo nyob rau ntau lub sijhawm. Ua ke, lawv tau muab faib ua ob pawg loj: lub suab lossless (kev poobsiab) thiab kev kub ntxhov (yaig). Ntawm cov qub, FLAC yog tus coj, ntawm qhov kawg, qhov tseeb monopoly mus rau MP3. Yog li cov ntsiab lus sib txawv ntawm cov FLAC thiab MP3, thiab lawv puas tseem ceeb rau tus mloog?
FLAC thiab MP3 yog dab tsi
Yog hais tias cov suab kaw hauv FLAC hom los sis hloov los ntawm nws los ntawm lwm hom kev ua kom poob, tag nrho cov ntau zaus thiab cov lus qhia ntxiv txog cov ntsiab lus ntawm cov ntaub ntawv (metadata) raug cawm. Cov ntaub ntawv muaj raws li nram no:
- four byte identification string (FlaC);
- Streaminfo metadata (tsim nyog rau kev teeb tsa cov khoom siv playback);
- lwm cov blocks metadata (yeem);
- audiofremy.
Kev xyaum ua ntaub ntawv ncaj qha FLAC-cov ntaub ntawv thaum lub sij hawm kev ua suab paj nruag "nyob" los yog los ntawm cov ntaub ntawv sau cov ntaub ntawv yog thoob plaws.
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Hauv kev txhim kho cov txheej txheem ciav hlau rau MP3 ntaub ntawv, tus qauv psychoacoustic ntawm ib tug neeg raug coj los ua lub hauv paus. Tsuas yog, thaum lub sij hawm hloov siab los ntseeg, cov ntu ntawm cov spectrum uas peb pob ntseg tsis pom los sis tsis xav pom yuav raug "txiav tawm" ntawm lub suab. Tsis tas li, yog tias cov kab ntub ntws zoo ib yam li ntawm cov theem, lawv tuaj yeem hloov dua siab tshiab rau lub suab mono. Lub ntsiab qauv rau lub suab zoo yog compression ratio - bitrate:
- mus txog 160 kbps - tsis tshua muaj txiaj ntsig zoo, ntau qhov cuam tshuam rau sab nrauv, dips hauv frequencies;
- 160-260 kbps - nruab nrab zoo, nruab nrab kev luam ntawm cov kev siv ntau dua;
- 260-320 kbps - zoo tshaj, niaj hnub, suab sib sib zog nqus nrog tsawg kawg ntawm kev cuam tshuam.
Qee lub sij hawm qis me ntsis yog ua tiav los ntawm kev hloov cov ntaub ntawv qis dua. Lus hauv no teb Qhov no tsis zoo lub suab zoo - cov ntaub ntawv ntawm 128 mus 320 bps yuav tseem suab zoo li 128-ntsis cov ntaub ntawv.
Cov lus: sib piv ntawm cov yam ntxwv thiab qhov txawv ntawm lub suab
| Qhov Ntsuas | FLAC | Tsawg bitrate mp3 | High kawg bitrate mp3 |
| Compression hom ntawv | poob | nrog rau kev puas tsuaj | nrog rau kev puas tsuaj |
| Suab zoo | siab | tsawg | siab |
| Ntim ntawm ib zaj nkauj | 25-200 MB | 2-5 MB | 4-15 MB |
| Lub hom phiaj | mloog cov suab paj nruag hauv suab nrov zoo, tsim kom muaj suab paj nruag | nruab ringtones, khaws thiab ua si cov ntaub ntawv ntawm cov khoom siv nrog tsawg nco | mloog suab paj nruag hauv tsev, cia ntawm phau ntawv qhia txog cov khoom siv tau |
| Compatibility | PCs, qee cov xov tooj smartphones thiab ntsiav tshuaj, cov players sab saum toj kawg nkaus | ntau cov khoom siv hluav taws xob | ntau cov khoom siv hluav taws xob |
Yog xav hnov qhov txawv ntawm MP3-FLAC-ntaub ntawv zoo, koj yuav tsum muaj pob ntseg rau suab paj nruag, los yog "suab paj nruag" suab lus. Kom mloog suab paj nruag hauv tsev los yog ntawm txoj kev, hom ntawv MP3 yog ntau tshaj li txaus, thiab FLAC tseem yog cov kws ntaus nkauj, DJs thiab audiophiles.
