Txawm hais tias cov CDs sau ua ntej tau poob luster nrog qhov yooj yim ntawm cov suab paj nruag streaming thiab rub tawm, CD tau pib lub suab paj nruag digital. Ntau tus kiv cua tseem nyiam CDs thiab yuav thiab ua si CDs tsis tu ncua. Nov yog txhua yam koj yuav tsum paub txog audio CDs thiab lwm yam disc-based formats.
The Audio CD Format
CD stands rau compact disc. Compact disc yog hais txog ob lub disc thiab digital audio playback hom tsim los ntawm Philips thiab Sony. Cov hom ntawv hais txog lub suab uas yog digitally encoded zoo li cov ntaub ntawv hauv computer (1s thiab 0s) rau hauv qhov chaw ntawm lub disc los ntawm cov txheej txheem hu ua PCM. PCM yog tus sawv cev ua lej ntawm cov suab thiab suab paj nruag hauv daim ntawv digital.
thawj CD kaw tau tsim nyob rau hauv lub teb chaws Yelemees thaum Lub Yim Hli 17, 1982. Lub npe ntawm thawj daim CD kaw thawj zaug yog Richard Strauss 'Alpine Symphony. Tom qab xyoo ntawd, thaum Lub Kaum Hli 1, 1982, CD player tau muaj nyob hauv Asmeskas thiab Nyij Pooj. Thawj CD muag yog nyob rau hauv Nyiv-Billy Joel's 52nd Street, yav dhau los tso rau hauv vinyl xyoo 1978.
Tus qauv CD audio format kuj raug xa mus rau Redbook CD.
Cov CD tau pib lub kiv puag ncig digital hauv suab, PC gaming, thiab daim ntawv thov khaws cia hauv PC. Nws kuj tau pab txhawb rau txoj kev loj hlob ntawm cov DVD. Sony thiab Philips koom ua ke tuav patents ntawm kev txhim kho CD thiab CD player technology.
Txawm hais tias cov suab paj nruag tau muab tso rau hauv CD digitally, kev kaw lus thawj zaug thiab kev sib xyaw yuav yog kev sib xyaw ua ke ntawm cov txheej txheem analog thiab digital.
Los ntawm nws qhov kev tshwm sim txog xyoo 1995, cov ntawv sau ua ntej CD suav nrog cov lej tshwj xeeb (hu ua SPARS cov lej) ntawm lub ntim. Cov lis dej num no tau qhia rau cov neeg siv khoom txog kev kaw, sib xyaw, thiab kev paub siv los ua cov CD tshwj xeeb. Tej zaum koj tseem yuav muaj daim ntawv lo rau ntawm qee cov CDs uas koj muaj.
SPARS Codes Rau CDs
Tus SPARS cov lej rau CDs yog:
- AAD: Thawj lub suab kaw tau tsim los siv cov cuab yeej kaw suab (xws li lub suab kaw suab). Kev sib xyaw kuj tau ua tiav siv cov khoom siv analog, thiab qhov kawg mastering tau ua tiav digitally.
- ADD: Thawj lub suab kaw tau tsim los siv cov cuab yeej kaw lus analog (xws li lub suab kaw suab). Kev sib xyaw ua ke tau ua tiav digitally, thiab qhov kawg mastering tau ua tiav digitally.
- DDD: Txhua theem, los ntawm kev sau thawj zaug mus rau qhov kawg mastering, tau ua tiav digitally.
Rau CDs, tsab ntawv kawg ntawm SPARS code yeej ib txwm yog D.
Lwm Siv rau CDs
Ntxiv rau cov suab kaw ua ntej, CDs kuj tseem siv tau rau hauv ob peb lwm daim ntawv thov:
- CD-R: CD-R stands rau CD-Recordable. Cov discs no tuaj yeem siv los sau lossis hlawv suab paj nruag lossis cov ntaub ntawv siv CD (tsuas yog suab paj nruag) lossis PC (suab paj nruag lossis cov ntaub ntawv). Qee cov CD-Rs tau tsim los rau kev kaw suab paj nruag nkaus xwb, thiab lwm tus tuaj yeem kaw suab paj nruag lossis cov ntaub ntawv. CD-Rs tuaj yeem kaw ib zaug xwb.
- CD-RW: Tib lub peev xwm ib yam li CD-R, tshwj tsis yog tias CD tuaj yeem tshem tawm thiab siv dua. RW npe txhais tau tias rov sau tau.
- CD-TEXT: Qhov no yog ib qho kev hloov pauv ntawm lub CD uas muab cov ntaub ntawv xov xwm ntawm disc ntxiv rau cov suab paj nruag. Qhov no tej zaum yuav suav nrog tej yam xws li cov ntawv disc ntawm cov ntsiab lus, taug qab lub npe, tus kws kos duab, thiab qee zaum, cov nkauj thiab ib hom ntawv nyeem. Ntawm CD players, cov ntaub ntawv cov ntaub ntawv yog qhia nyob rau ntawm tus neeg uas ua ntawv cov xwm txheej zaub, yog hais tias nws muaj ib tug. Tsis tas li, yog tias CD tau ua si hauv DVD lossis Blu-duab tshav Disc player, feem ntau, cov ntaub ntawv yuav raug tso tawm ntawm lub vijtsam TV.
- MP3-CD: MP3 CD tuaj yeem yog CD-R lossis RW disc uas MP3 cov ntaub ntawv suab paj nruag raug kaw rau, tsis yog cov ntaub ntawv suab CD. Cov discs no tuaj yeem ua si rau feem ntau CD, DVD, thiab Blu-duab tshav Disc players.
- JPEG Yees Duab CD: JPEG Duab CD tuaj yeem yog CD-R lossis RW disc uas muaj cov duab ntawm nws kaw hauv JPEG cov ntaub ntawv hom. JPEG Diam duab CDs tuaj yeem ua si hauv PCs thiab tshaj CD, DVD, thiab Blu-duab tshav Disc players.
- VideoCD: Ntxiv rau cov suab thiab cov duab, koj tuaj yeem kaw cov yeeb yaj kiab hauv CD. Qhov no tsis yog tib yam li DVD, nrog rau qhov zoo ntawm VHS thiab DVD hom. Tsis tas li ntawd, cov yeeb yaj kiab CDs tsis tuaj yeem ua si ntawm CD players tshwj tsis yog cov CD player muaj qhov sib txuas video, uas tsis zoo li. VideoCDs tuaj yeem ua si tau ntawm DVD thiab Blu-duab tshav Disc sib xws.
- CD Graphics: Qhov kev hloov pauv tsis tshua muaj ntawm CD hom ntawv suav nrog cov duab yooj yim uas tuaj yeem nyeem tau los ntawm tus neeg uas ua ntawv sib xws nrog cov yeeb yaj kiab tso tawm rau hauv TV lossis video projection screen. Qhov peev xwm no feem ntau yog siv los tso saib cov nkauj nkauj rau cov ntawv thov karaoke. Cov yeeb yam no yuav raug sau npe CD+G, CD-G, CD+Graphics, CD-Extended Graphics, lossis TV-Graphics.
Yog xav paub ntxiv txog keeb kwm ntawm audio CD, mus saib daim duab thiab kev tshuaj xyuas tiav (sau xyoo 1983 los ntawm Stereophile Magazine) ntawm thawj CD player muag rau pej xeem.
High Definition Compact Disc (HDCD)
HDCD yog qhov hloov pauv ntawm CD suab tus qauv uas txuas ntxiv cov ntaub ntawv suab khaws cia hauv CD teeb liab los ntawm 4 ntsis (CDs yog raws li 16-ntsis suab thev naus laus zis) txog 20 khoom. HDCD tuaj yeem txuas ntxiv lub peev xwm ntawm cov cuab yeej CD tam sim no mus rau cov qauv tshiab tab sis tseem ua kom HDCD encoded CDs yuav tsum tau ua si ntawm cov tsis-HDCD CD players yam tsis tau nce tus nqi CD software. Tsis tas li ntawd, raws li cov khoom lag luam ntawm cov khoom siv lim dej ntau dua hauv HDCD chips, txawm tias cov CDs ib txwm muaj suab nrov dua thiab muaj txiaj ntsig zoo dua qub ntawm HDCD-nrog CD player.
HDCD yog thawj zaug tsim los ntawm Pacific Microsonics thiab tom qab ntawd los ua cov cuab yeej ntawm Microsoft. Thawj HDCD disc tau tso tawm hauv xyoo 1995. Txawm hais tias nws yeej tsis dhau ntawm Redbook CD hom, tshaj 5,000 lub npe tau tso tawm. Mus saib cov npe ib nrab.
Thaum yuav CDs suab paj nruag, nrhiav HDCD sau npe nyob tom qab lossis ntim khoom sab hauv. Ntau qhov kev tshaj tawm yuav tsis suav nrog HDCD daim ntawv lo tab sis tseem yuav yog HDCD discs. Yog tias koj muaj CD player uas nta HDCD txiav txim siab, nws cia li kuaj pom nws thiab muab cov txiaj ntsig ntxiv.
HDCD kuj tseem raug xa mus rau Kev Txhais Siab Tshaj Plaws Digital, Siab Txhais Lus Compact Digital, thiab High Definition Compact Disc.
Super Audio Compact Disc (SACD)
SACD (Super Audio Compact Disc) yog lub siab daws teeb meem audio disc hom tsim los ntawm Sony thiab Philips. Siv cov hom ntawv Direct Stream Digital (DSD), SACD muab lwm txoj hauv kev rau Pulse Code Modulation (PCM) siv hauv CD hom.
Thaum tus qauv CD hom yog khi rau 44.1 kHz sampling tus nqi, SACD cov qauv ntawm 2.8224 MHz. Tsis tas li ntawd, es tsis txhob 16-ntsis qhov tob, nws siv qhov tob 1-ntsis. Nrog lub peev xwm cia ntawm 4.7 gigabyte ib disk (ntau npaum li DVD), SACD tuaj yeem ua kom haum rau cov suab sib cais thiab rau-channel sib xyaw ntawm 100 feeb txhua. SACD hom tuaj yeem tso saib cov duab thiab cov ntaub ntawv, xws li cov ntawv sau. Txawm li cas los xij, cov yam ntxwv no tsis tau muab tso rau hauv feem ntau cov discs.
Kos koj lub CD Player kom ua tau zoo
CD players tsis tuaj yeem ua si SACDs, tab sis SACD cov players rov qab sib xws nrog cov CDs. Qee cov SACD disks yog ob-txheej discs nrog PCM cov ntsiab lus uas tuaj yeem ua si ntawm tus qauv CD player. Hauv lwm lo lus, tib lub disk tuaj yeem tuav ob lub CD thiab SACD version ntawm cov ntsiab lus kaw. Qhov ntawd txhais tau tias koj tuaj yeem nqis peev hauv ob hom SACDs los ua si ntawm koj lub CD player tam sim no thiab tom qab ntawd nkag mus rau SACD cov ntsiab lus ntawm tib lub disc tom qab ntawm SACD-tshaj player.
Tsis yog txhua qhov SACD discs muaj txheej txheem CD. Qhov no txhais tau tias koj yuav tsum kuaj xyuas daim ntawv lo kom pom tias ib qho tshwj xeeb SACD disc tuaj yeem ua si ntawm tus qauv CD player.
Muaj qee qhov siab dua-kawg DVD, Blu-duab tshav, thiab Ultra HD Disc players uas tseem ua si SACDs.
SACDs tuaj hauv ob-channel lossis ntau-channel. Nyob rau hauv rooj plaub thaum SACD kuj muaj CD version ntawm lub disc, CD yuav ib txwm yog ob-channel, tab sis SACD txheej yuav yog ob los yog ntau-channel version.
DSD cov ntaub ntawv hom coding siv hauv SACDs kuj tseem siv los ua ib qho ntawm cov qauv muaj rau Hi-Res audio downloads. Qhov no muab cov neeg mloog suab paj nruag txhim kho qhov zoo hauv lub cev tsis yog lub cev lub disc hom.
DSD-encoded suab paj nruag cov ntaub ntawv tuaj yeem rub tawm los ntawm cov kev pabcuam xws li HD Tracks, HighResAudio, Native DSD, ProStudio Masters, thiab Super HiRez. Cov ntaub ntawv tuaj yeem khaws cia rau hauv PCs thiab khaws cia rau hauv xov xwm xws li hard drive lossis USB flash drive.
SACD tseem hu ua Super Audio CD, Super Audio Compact Disc, thiab SA-CD.
