Tau txais cov lus qhia txog Cov CDs thiab cov ntaub ntawv tawm suab
Txawm hais tias pre-kaw CDs tau poob lawv cov luster nrog cov kev yooj yim ntawm digital music streaming thiab downloads , nws yog CD uas pib lub suab paj nruag digital. Ntau tus tseem nyiam CDs thiab ob leeg yuav thiab ua si lawv tas li. Nov yog yam koj yuav tsum paub txog Audio CDs, thiab cov ntawv tawm suab ntsig.
Lub Cim Ntawv CD
CD sawv cev rau Compact Disc. Compact Disc yog hais txog ob qho tib si lub suab paj nruag thiab digital playback hom tsim los ntawm Philips thiab Sony uas muaj suab rau digitally encoded, zoo ib yam li lub computer cov ntaub ntawv yog encoded (1's thiab 0's), ua cov pits ntawm lub disc, siv cov txheej txheem hu ua PCM uas yog cov sawv cev ntawm lub suab paj nruag.
Cov ntawv CD thawj zaug tau tsim tawm hauv lub teb chaws Yelemees rau lub Yim Hli 17, 1982. Lub npe ntawm thawj daim ntawv teev kev ntsuas CD: Richard Strauss '- Alpine Symphony . Nws yog xyoo tom qab ntawd, thaum Lub Kaum Hli 1 xyoo 1982, cov CD players tau ua nyob rau hauv Tebchaws Meskas thiab Nyij Pooj. Thawj CD muag (thawj hauv Nyij Pooj) yog Billy Joel txoj kev 52nd Street uas tau muab tso tawm ua ntej xyoo 1978.
CD pib lub kiv puag ncig hauv cov suab, PC Gaming, PC cia daim ntawv sau npe, thiab tseem tuaj yeem pab tsim kho cov DVD. Sony thiab Philips tau koom tes tuav cov kab ke ntawm CD thiab CD player tshuab.
Cov txheej txheem CD audio format kuj yog hu ua "Redbook CD".
Yog xav paub ntxiv txog keeb kwm ntawm CD audio, kos tawm tsab ntawv ceeb toom los ntawm CNN.com.
Tsis tas li ntawd, kos tawm ib daim duab thiab kev txheeb xyuas tiav (sau rau 1983 los ntawm Stereophile Magazine) ntawm thawj CD neeg muag khoom muag rau pej xeem.
Ntxiv nrog rau cov suab kaw ua ntej, CDs kuj tuaj yeem siv tau rau ntau daim ntawv sau npe:
- CD-R - CD-R yog tus CD-Recordable. Cov paj no siv tau los sau los yog "hlawv" suab paj nruag los yog cov ntaub ntawv siv CD Recorder (suab paj nruag nkaus xwb) lossis lub PC (suab paj nruag los yog cov ntaub ntawv). Qee cov CD-R's raug tso cai rau kev kaw suab nkauj thiab lwm tus tuaj yeem sau tau cov suab paj nruag los yog cov ntaub ntawv. CD-Rs tsuas tuaj yeem sau tseg ib zaug xwb.
- CD-RW - Tib lub peev xwm ua CD-R, tshwj tsis yog tias CD tau raug rho tawm thiab siv dua (lub npe RW txhais tau hais tias Re-writable).
- MP3-CD - Ib qho MP3 CD yuav yog CD-R lossis RW discs uas cov ntaub ntawv MP3 music kaw tseg, tsis yog cov ntaub ntawv tso tawm CD audio. Cov discs yuav tau ua si ntawm CD, DVD, thiab Blu-Ray Disc players (koj yuav tsum tau xyuas cov neeg uas ua ntawv cov nta).
- JPEG Photo CD - Ib tug JPEG Photo CD yuav yog CD-R lossis RW disc uas muaj cov duab rau nws tau sau tseg rau hauv JPEG ntaub ntawv hom ntawv. JPEG Diam duab CDs tau muab tso rau hauv PCs thiab CD, DVD, thiab Blu-Ray Disc players.
- VideoCD - Ntxiv rau cov suab thiab cov duab, koj tuaj yeem sau cov video hauv CD . Qhov no tsis zoo ib yam li ib daim DVD, nrog rau qhov zoo tshaj plaws hauv-ntawm cov DVD thiab VHS hom ntawv. Tsis tas li ntawd, video CDs tsis yog playable CD players, tsuas yog cov neeg uas ua CD ntaus ntawv muaj kev sib txuas ua video (uas tsis yog) - txawm hais tias dlhau VideoCD players tau ib zaug nrov hauv Asian markets. VideoCDs yog cov playable ntawm DVD thiab Blu-Ray disc players.
HDCD
HDCD yog ib qho kev hloov ntawm cov CD suab uas nthuav tawm cov suab ntaub ntawv khaws cia hauv CD teeb liab los ntawm 4-cov khoom ( CDs raws li 16 lub suab audio technology ) mus rau 20bits, HDCD tuaj yeem ntev qhov peev xwm ntawm kev siv technology tshiab rau cov qauv tshiab, tab sis tseem muaj zog, HDCD encoded CDs yuav raug ua si rau non-HDCD CD players (non-HDCD players xwb las mees lub ntxiv "khoom" tsis muaj nce hauv tus nqi ntawm CD software. Kuj, raws li ib tug by-product ntawm ntau leej filtering circuitry nyob rau hauv HDCD chips, Txawm tias \ "li \" CDs yuav sound fuller thiab ntau yam ntuj tso rau ib qho HDCD-ntim CD player.
HDCD yog Ameslikas tsim los ntawm Pacific Microsonics, thiab tom qab dhau los ua tus tswv ntawm Microsoft. Cov HDCD thawj zaug tau tso tawm rau xyoo 1995, thiab txawm tias nws tsis tau dhau los Redbook CD, tshaj li 5,000 lub npe tawm (sau tawm ntawm ib daim ntawv sau).
Thaum muas cov suab paj nruag CDs, nrhiav cov HDCD lub npe ntawm sab nraum qab los yog ntim sab hauv. Txawm li cas los xij, muaj ntau ntau yam uas tsis suav nrog HDCD daim ntawv lo, tab sis, tej zaum tseem yog HDCD discs. Yog tias koj muaj CD player uas nta HDCD decoding, nws yuav tau kuaj nws thiab muab cov kev pab ntxiv.
HDCD kuj raug xa mus rau High Definition Compatible Digital, High Definition Compact Digital, High Definition Compact Disc
SACD
SACD (Super Audio Compact Disc) yog lub ntsiab lus siab audio disc uas tau tsim los ntawm Sony thiab Philips (uas tseem tsim CD). Siv cov ntaub ntawv hu ua Direct Stream Digital (DSD), SACD muab kev tshaj tawm suab ntau dua li cov Pulse Code Modulation (PCM) siv nyob rau hauv hom ntawv CD tam sim no.
Thaum cov txheej txheem CD daim ntawv raug khi rau 44.1 kHz tus nqi qis, SACD kuaj ntawm 2.8224 MHz. Kuj, nrog cia muaj peev xwm ntawm 4.7 gigabytes ib disk (ntau npaum li ib lub DVD), SACD tuaj yeem ua raws cais lub tso suab thiab six-channel mixes ntawm 100 feeb txhua. Daim ntawv SACD tseem muaj peev xwm los tso saib yees duab thiab ntawv xov xwm, xws li cov ntawv sau cia, tiam sis qhov no tsis yog siv rau hauv ntau cov discs.
Cov CD players tsis tuaj yeem ua si SACDs, tab sis SACD cov players rov qab tau tshaj CDs, thiab qee qhov SACD disks yog ob txheej sab nraud nrog PCM cov ntaub ntawv uas tau muab tso rau hauv cov CD players. Hauv lwm cov lus, tib lub disk yuav tuav ob lub CD version thiab SACD version ntawm cov ntaub ntawv kaw tseg. Qhov no txhais tau hais tias koj tuaj yeem nqis peev tau rau hauv ob hom SACD qhov ua si ntawm koj tus neeg siv CD tam sim no thiab nkag mus rau SACD cov ntsiab lus ntawm tib lub disc tom qab ntawm SACD-tshaj cov neeg uas ua ntawv.
Nws yuav tsum raug sau tseg tias tsis yog txhua tus SACD discs muaj txheej txheem CD txheej - uas txhais tau hais tias koj yuav tsum tshawb xyuas cov ntawv pov tseg kom pom tau tias ib qho SACD disc kuj tseem tuaj yeem ua si ntawm tus CD neeg ntaus ntawv.
Tsis tas li ntawd, muaj ntau cov DVD, Blu-Ray, thiab Ultra HD Disc players tseem tuaj yeem ua si SACDs.
SACD yuav tuaj yeem ua rau hauv cov 2-channel lossis multi-channel versions. Hauv cov rooj plaub uas muaj SACD kuj muaj CD version ntawm daim disk, CD yuav tsum yog 2-channels, tab sis SACD txheej yuav yog ib qho 2 los sis ntau hom xov xwm.
Ib qho ntxiv rau taw tes yog tias DSD cov ntaub ntawv coding siv nyob rau hauv SACDs kuj tam sim no yog siv los ua ib hom ntawv siv rau kev siv Hi-Res audio downloads. Qhov no muaj suab paj nruag mloog zoo tshaj plaws hauv ib qho uas tsis yog lub cev lub suab qiv.
SACD kuj raug xa mus rau Super Audio CD, Super Audio Compact Disc, SA-CD