Ekusetyenzisweni kwesandi esijikelezileyo, zombini iDolby AC3 kunye neDTS zinempawu yokuba zifuna izithethi ezininzi ngexesha lokudlala. Nangona kunjalo, ngenxa yezizathu zamaxabiso kunye nendawo, abanye abasebenzisi, njengabasebenzisi bekhompyutha yemultimedia, abanazo izithethi ezaneleyo. Okwangoku, kufuneka iteknoloji enokucubungula imiqondiso yeendlela ezininzi kwaye izidlale kwakhona kwizithethi ezimbini ezihambelanayo, kwaye zenze abantu bazive isiphumo sesandi esijikelezileyo. Le yiteknoloji yesandi esijikelezileyo esibonakalayo. Igama lesiNgesi lesandi esijikelezileyo esibonakalayo yiVirtual Surround, ekwabizwa ngokuba yiSimulated Surround. Abantu bayibiza le teknoloji njengeteknoloji yesandi esijikelezileyo esingesisemgangathweni.

Inkqubo yesandi esijikelezayo esingengomgangatho isekelwe kwi-stereo yeziteshi ezimbini ngaphandle kokongeza iitshaneli kunye nezithethi. Isignali yentsimi yesandi icutshungulwa yisekethe ize isasazwe, ukuze umphulaphuli akwazi ukuziva ukuba isandi sivela kwiindlela ezahlukeneyo kwaye sivelise intsimi yestereo esilingisiweyo. Ixabiso lesandi esijikelezayo esibonakalayo Ixabiso letekhnoloji esijikelezayo esibonakalayo kukusebenzisa izithethi ezibini ukulinganisa isiphumo sesandi esijikelezayo. Nangona ingenakuthelekiswa nethiyetha yangempela yasekhaya, isiphumo silungile kwindawo efanelekileyo yokumamela. Ingxaki yayo kukuba ayihambelani ngokubanzi nokumamela. Iimfuno zendawo yesandi ziphezulu, ngoko ke ukusebenzisa le teknoloji esijikelezayo esibonakalayo kwii-headphones lukhetho olufanelekileyo.

Kwiminyaka yakutshanje, abantu baqalise ukufunda ngokusetyenziswa kweetshaneli ezimbalwa kunye nezithethi ezimbalwa kakhulu ukwenza isandi esinemilinganiselo emithathu. Esi siphumo sesandi asiyonto inokwenzeka njengetekhnoloji yesandi esijikelezayo esivuthiweyo njengeDOLBY. Nangona kunjalo, ngenxa yexabiso layo eliphantsi, le teknoloji isetyenziswa kakhulu kwi-power amplifiers, kwiithelevishini, kwi-audio yemoto nakwi-AV multimedia. Le teknoloji ibizwa ngokuba yitekhnoloji yesandi esijikelezayo esingeyomigangatho. Inkqubo yesandi esijikelezayo esingeyomigangatho isekelwe kwi-stereo eneendlela ezimbini ngaphandle kokongeza iitshaneli kunye nezithethi. Isignali yentsimi yesandi icutshungulwa yisekethe ize emva koko isasazwe, ukuze umphulaphuli akwazi ukuziva ukuba isandi sivela kwiindlela ezahlukeneyo kwaye sivelise intsimi yestereo elinganisiweyo.

Umgaqo-nkqubo we-Virtual Surround Sound Isitshixo sokufezekisa i-Virtual Surround Sound kukucubungula isandi ngendlela ebonakalayo. Igxile ekucubunguleni iziteshi zesandi esijikelezileyo ngokusekelwe kwi-acoustics yomzimba womntu kunye nemigaqo ye-psychoacoustic, okwenza kube nzima ukubona ukuba umthombo wesandi esijikelezileyo uvela ngasemva okanye ecaleni komphulaphuli. Iziphumo ezininzi ezisekelwe kwimigaqo yokuva komntu ziyasetyenziswa. Isiphumo se-Binaural. Isazinzulu sefiziksi saseBritane uRayleigh safumanisa ngovavanyo ngo-1896 ukuba iindlebe ezimbini zabantu zinomahluko wexesha (0.44-0.5 microseconds), umahluko wobunzulu besandi kunye nomahluko wesigaba kwizandi ezithe ngqo ezivela kumthombo omnye wesandi. Uvakalelo lokuva lwendlebe yomntu lunokuqinisekiswa ngokusekelwe kwezi zincinci. Umahluko unokumisela ngokuchanekileyo indlela yesandi kwaye umisele indawo yomthombo wesandi, kodwa unokukhawulelwa kuphela ekumiseleni umthombo wesandi kwicala elithe tye ngaphambili, kwaye awunakusombulula indawo yomthombo wesandi sendawo onemilinganiselo emithathu.

Isiphumo se-Auricular. I-auricle yomntu idlala indima ebalulekileyo ekubonakalisweni kwamaza esandi kunye nesikhokelo semithombo yesandi sendawo. Ngale siphumo, indawo enobukhulu obuthathu bomthombo wesandi inokumiselwa. Iziphumo zokucoca iimvamisa zendlebe yomntu. Indlela yokubeka isandi kwindlebe yomntu inxulumene nemvamisa yesandi. I-bass ye-20-200 Hz ibekwe ngokwahluka kwesigaba, umgama ophakathi we-300-4000 Hz ibekwe ngokwahluka kwesandi, kwaye i-treble ibekwe ngokwahluka kwexesha. Ngokusekelwe kulo mgaqo, umahluko kulwimi nakwiithoni zomculo kwisandi esiphindiweyo unokuhlalutywa, kwaye unyango olwahlukeneyo lunokusetyenziswa ukwandisa ingqiqo yokujikeleza. Umsebenzi wokudlulisa onxulumene nentloko. Inkqubo yokuva yomntu ivelisa ii-spectrum ezahlukeneyo zezandi ezivela kumacala ahlukeneyo, kwaye olu phawu lwe-spectrum lunokuchazwa ngumsebenzi wokudlulisa onxulumene nentloko (HRT). Ukuqukumbela, indawo yendlebe yomntu ibandakanya amacala amathathu: ngokuthe tye, ngokuthe nkqo, nangaphambili nangasemva.

Indawo ethe tye ixhomekeke kakhulu kwiindlebe, indawo ethe nkqo ixhomekeke kakhulu kwiqokobhe lendlebe, kwaye indawo engaphambili nangasemva kunye nokuqonda kwentsimi yesandi esijikelezileyo kuxhomekeke kumsebenzi we-HRTF. Ngokusekelwe kwezi ziphumo, i-virtual Dolby surround ngokwenziwa idala imeko efanayo yesandi njengomthombo wesandi okhoyo endlebeni yomntu, ivumela ingqondo yomntu ukuba ivelise imifanekiso yesandi ehambelanayo kwindawo efanelekileyo.