I-Super Audio Compact Disc (SACD) ifom ye-disc ophambili ekujoliswe ekusebenziseni umsindo ophezulu. I-SACD yaziswa ngo-1999 yiinkampani ze-Sony ne-Philips, iinkampani ezifanayo ezazisa i-compact disc (CD). I-format ye-discD ye-disk ayizange ifakwe kwizorhwebo, kunye nokukhula kwezixhobo ze-MP3 kunye nomculo we-digital, i-market for SACD iye yahlala encinane.
SACDs kunye neeCD
I-discact disc irekhodwe kunye ne-16-bits yesisombululo kwisilinganiso sampampu esingu-44.1kHz. Abadlali be-SACD kunye nee-disk zisekelwe kwi-Direct Stream Digital (DSD), ukufometha kwe-b-bit ngezinga lokumitha eli-2.8224MHz, eliphindwe ngamaxesha angama-64 kwi-compact disc. Isilinganiso samphakamiso esiphezulu siphumela kwimpendulo ephindaphindiweyo kunye nokuveliswa komsindo ngeenkcukacha ezingaphezulu.
Uluhlu lwexesha le-CD luyi-20 Hz ukuya kwi-20 kHz, olulingana nokuva kwabantu (nangona sithatha ubude bethu bunciphisa abanye). Ibanga le-SACD liphindwe kwi-20Hz ukuya ku-50 kHz.
Uluhlu olunamandla lweCD luyi-90 decibels (dB) (uluhlu lomntu apha lufikelela kwi-120 dB). Uluhlu olushukumisayo lwe-SACD ngu-105 dB.
Ii-discD ze-SACD azikho mxholo wevidiyo, i-audio kuphela.
Ukuvavanya ukufumana ukuba abantu bayayiva umahluko phakathi kweCD kunye ne-SACD irekhodiweyo, kwaye iziphumo zibonisa ngokubanzi ukuba umntu oqhelekileyo akakwazi ukuchaza umahluko phakathi kweefomathi ezimbini. Iziphumo, nangona kunjalo, azithathwa njengento echanekileyo.
Iintlobo zee-DiscD Discs
Kukho iintlobo ezintathu ze-Super Audio Discact Discs: i-hybrid, i-layer-layer, kunye nocingo olulodwa.
- Iidiski ze-hybrid zinemiqolo emibini, ugcino oluphezulu olusebenzayo olungadlala kuphela kwi-SACD abadlali abaxhobileyo, kunye nekhompyutheni ye-CD eya kudlala kuma-CD abadlali abaqhelekileyo. Ukongezelela, ezinye ii-disk ze-hybrid ze-SACD zineziganeko ezijikelezayo zendlela ye-5.1 kunye nomzila we-stereo. Umzila weendlela ezininzi ungadlala kuphela kumaqela amaninzi e-SACD.
- Iingxowa ze-SACD zodwa ziza kudlala kuphela kwi-SACD abadlali abaxhotywayo kwaye kungekhona kumdlali oqhelekileyo weCD.
- Iidiski zombini zokugcina izitoreji zomculo eziphindwe kabini njengediski enye yecala kodwa ayiyi kudlala kuma-CD abadlali kwaye aziqhelekanga.
Iingenelelo zeSACD
Nokuba inkqubo yesimo se-stereo inokuthotywa inokuzuza ngokucacileyo ukwandisa nokunyaniseka kweediski ze-SACD. Isilinganiso samphakamiso esiphezulu (2.8224MHz) sinomthelela kwimpendulo ephindaphindiweyo, kwaye ii-discd ze-SACD zikwazi ukudlala ukudlala kunye nemininingwane.
Ekubeni ezininzi ze-SACD zi-disk zihlobo ze-hybride, ziya kudlala kwi-SACD kunye nabadlali be-CD abaqhelekileyo, ngoko banokuzonwabisa kwi-audio system system, kunye neenkqubo zemoto okanye eziphathekayo. Bathengisa ngaphaya kwama CD, kodwa abaninzi bacinga ukuba umgangatho wabo ophezulu ufanelekile kwixabiso eliphezulu.
Abadlali beSACD kunye neeNxibelelwano
Abanye abadlali be-SACD badinga uxhumano lwe-analog (okanye umzila wesibini okanye umzila we-5.1) ukuya kummkeli ukudlala uluhlu oluphezulu lwe-SACD ngenxa yemicimbi yokukhusela ikopi. Uluhlu lweCD lungadlala ngoxhumo lwe-digital coaxial okanye optical. Abanye abadlali be-SACD bavumela ukuxhamla kwedijithali enye (ngamanye amaxesha kuthiwa yi-iLink) phakathi komdlali kunye nommkeli, ophelisa imfuno yokudibanisa i-analog.