Super Audio Compact Disc (SACD) yog ib hom ntawv kho qhov muag pom kev rau kev ua tau zoo hauv playback. SACD tau pib xyoo 1999 los ntawm cov tuam txhab Sony thiab Philips, tib lub tuam txhab uas tau pib ua cov CD (CD). Lub SACD disc hom tsis tau ntes ntawm kev lag luam, thiab nrog kev loj hlob ntawm MP3 players thiab digital music, lub khw muag khoom rau SACDs tseem me me.
SACDs vs. CDs
Lub compact disc yog kaw nrog 16-khoom ntawm kev daws teeb meem ntawm kev sampling ntawm 44.1kHz. SACD players thiab discs yog raws li Direct Stream Digital (DSD) ua, ib hom ntawv 1-ntsis nrog ib tug sampling tus nqi ntawm 2.8224 MHz, uas yog 64 lub sij hawm tus nqi ntawm tus qauv compact disc. Qhov qis dua tus nqi tau los ntawm cov lus teb rau cov lus teb thiab cov suab nrov ntau dua.
Qhov ntau ntawm CD yog 20 Hz mus rau 20 kHz, sib npaug rau tib neeg lub rooj sib hais (tab sis yog peb hnub nyoog peb khwv tau ploj zuj zus). SACD qhov ntau zaus yog 20Hz txog 50 kHz.
Dynamic ntau ntawm CD yog 90 decibels (dB) (qhov txawv rau tib neeg ntawm no yog mus txog 120 dB). Qhov dynamic range ntawm SACD yog 105 dB.
SACD discs tsis muaj cov yeeb yaj duab, tsuas yog suab.
Xeem mus nrhiav kom paub tias cov tib neeg hnov qhov txawv ntawm CD thiab SACD cov ntaub ntawv tau ua tiav, thiab cov ntsiab lus tau qhia tau tias tus neeg nruab nrab tsis tuaj yeem qhia qhov txawv ntawm ob hom qauv. Cov txiaj ntsig, tab sis, tsis tau pom zoo.
Hom SACD Discs
Muaj peb hom Super Audio Compact Discs: hybrid, dual-layer, thiab ib txheej.
- Hybrid discs muaj ob lub khaubncaws sab nraud povtseg, ib qhov kev ua haujlwm siab dua uas ua tau rau SACD nkaus xwb, thiab CD txheej uas yuav ua rau cov menyuam CD players. Tsis tas li ntawd, qee qhov Hybrid SACD discs muaj ob qho tib si 5.1 taug kev puag ncig thiab lub tso suab. Txoj kev sib tshuam hauv multichannel tuaj yeem raug ntaus ua si ntawm multichannel SACD players.
- Tib txheej SACD discs yuav ua si rau SACD nkaus xwb uas tsis muaj cov players hauv CD.
- Dual-layer discs cia ob npaug suab paj nruag ua ib txheej txheej nkaus xwb tiam sis yuav tsis ua si rau cov CD players thiab tsis zoo ib yam.
Qhov zoo ntawm SACD
Txawm tias lub cev tsis muaj zog yuav tau txais txiaj ntsim los ntawm kev pom tseeb thiab kev ncaj ncees ntawm SACD discs. Qhov ntau dua qhov piv txwv (2.8224MHz) txhawb rau kev ncua sij hawm ntev, thiab SACD discs muaj peev xwm ntau dua kev ua si ntau dua thiab kev nthuav dav.
Vim ntau SACD discs yog hom sib txawv, lawv yuav ua si rau SACD thiab cov CD players, yog li lawv muaj peev xwm nyiam ua rau hauv tsev audio system, thiab cov tsheb lossis lub tshuab nruab suab. Lawv raug nqi ntau dua CDs, tab sis coob leej xav tias lawv lub suab zoo dua yog tsim nyog tus nqi siab dua.
SACD Players thiab Kev Sib Txuas
Qee tus SACD players yuav tsum muaj kev sib txuas analog (xws li 2 channel los yog 5.1 cov channel) rau ib tus neeg tuaj yeem ua si kom zoo dua SACD txheej vim tias daim ntawv tiv thaiv teeb meem. CD txheej yuav raug ntaus ntawm ib qho kev sib txuas los yog kho qhov muag. Qee tus neeg SACD cov tub ntxhais kawm tau tso cai rau ib qho kev sib txuas lus (qee zaus hu ua iLink) ntawm tus neeg uas ua ntawv thiab tus neeg tuaj yeem, uas tshem tawm qhov kev xav tau rau cov kev sib txuas analog.