Pakugwiritsa ntchito mawu ozungulira, Dolby AC3 ndi DTS zonse zimakhala ndi khalidwe loti zimafuna ma speaker ambiri panthawi yosewera. Komabe, chifukwa cha mtengo ndi malo, ogwiritsa ntchito ena, monga ogwiritsa ntchito makompyuta a multimedia, alibe ma speaker okwanira. Pakadali pano, pakufunika ukadaulo womwe ungagwire ntchito ndi ma signaling a multi-channel ndikuseweranso m'ma speaker awiri ofanana, ndikupangitsa anthu kumva phokoso lozungulira. Uwu ndi ukadaulo wa mawu ozungulira. Dzina la Chingerezi la mawu ozungulira ndi Virtual Surround, lomwe limatchedwanso Simulated Surround. Anthu amatcha ukadaulo uwu ukadaulo wosakhala wa standard surround sound.

Dongosolo la mawu ozungulira losakhazikika limachokera ku stereo ya njira ziwiri popanda kuwonjezera ma channel ndi ma speaker. Chizindikiro cha malo omveka chimakonzedwa ndi dera kenako n’kufalitsidwa, kuti womvera athe kumva kuti phokosolo likuchokera mbali zosiyanasiyana ndikupanga gawo loyeserera la stereo. Kufunika kwa mawu ozungulira enieni Kufunika kwa ukadaulo wozungulira weniweni ndikugwiritsa ntchito ma speaker awiri kuti ayerekezere zotsatira za mawu ozungulira. Ngakhale sizingafanane ndi malo enieni ochitira zisudzo, zotsatira zake zimakhala bwino pamalo abwino kwambiri omvetsera. Kuipa kwake ndikuti nthawi zambiri sikugwirizana ndi kumvetsera. Zofunikira pa malo omveka ndi zapamwamba, kotero kugwiritsa ntchito ukadaulo wozungulira uwu pa mahedifoni ndi chisankho chabwino.

M'zaka zaposachedwapa, anthu ayamba kuphunzira kugwiritsa ntchito njira zochepa kwambiri zopangira mawu ndi ma speaker ochepa kwambiri popanga mawu amitundu itatu. Mphamvu ya mawu iyi si yeniyeni monga ukadaulo wa mawu ozungulira monga DOLBY. Komabe, chifukwa cha mtengo wake wotsika, ukadaulo uwu ukugwiritsidwa ntchito kwambiri mu ma amplifiers amphamvu, ma TV, ma audio agalimoto ndi ma multimedia a AV. Ukadaulo uwu umatchedwa ukadaulo wa mawu ozungulira osakhala wamba. Dongosolo la mawu ozungulira osakhala wamba limachokera pa stereo ya njira ziwiri popanda kuwonjezera ma speaker ndi ma speaker. Chizindikiro cha malo omveka chimakonzedwa ndi dera kenako n’kuwulutsidwa, kuti womverayo athe kumva kuti mawuwo akuchokera mbali zosiyanasiyana ndikupanga malo oyeserera a stereo.

Mfundo Yokhudza Phokoso Lozungulira la Virtual Surround Chinsinsi chokwaniritsira phokoso la Dolby Surround Sound ndi kugwiritsa ntchito mawu pa intaneti. Imagwira ntchito yokonza mawu ozungulira pogwiritsa ntchito mawu a munthu ndi mfundo za psychoacoustic, zomwe zimapangitsa kuti anthu aziganiza kuti mawu ozungulira amachokera kumbuyo kapena kumbali ya womvera. Zotsatira zingapo zochokera ku mfundo za kumva kwa munthu zimagwiritsidwa ntchito. Katswiri wa sayansi ya zamoyo wa ku Britain, Rayleigh, adapeza kudzera mu zoyeserera mu 1896 kuti makutu awiriwa a anthu ali ndi kusiyana kwa nthawi (0.44-0.5 microseconds), kusiyana kwa mphamvu ya mawu ndi kusiyana kwa magawo a mawu olunjika ochokera ku gwero lomwelo la mawu. Kumva kwa khutu la munthu kumatha kudziwika kutengera zazing'onozi. Kusiyanaku kumatha kudziwa molondola komwe phokoso likupita ndikuzindikira komwe phokoso likuchokera, koma kungangochepetsa kudziwa komwe phokoso likuchokera kutsogolo, ndipo sikungathe kuthetsa malo omwe phokoso limachokera.

Mphamvu ya khutu la munthu. Khutu la munthu limagwira ntchito yofunika kwambiri pakuwonetsa mafunde a mawu ndi komwe magwero a mawu akuchokera. Kudzera mu izi, malo atatu a gwero la mawu amatha kudziwika. Zotsatira zakusefa pafupipafupi kwa khutu la munthu. Kagwiridwe kake ka mawu a khutu la munthu kamagwirizana ndi kuchuluka kwa mawu. Bass ya 20-200 Hz imapezeka potengera kusiyana kwa gawo, pakati pa 300-4000 Hz imapezeka potengera kusiyana kwa mphamvu ya mawu, ndipo treble imapezeka potengera kusiyana kwa nthawi. Kutengera mfundo iyi, kusiyana kwa chilankhulo ndi mawu a nyimbo mu mawu obwerezabwereza kumatha kufufuzidwa, ndipo njira zosiyanasiyana zingagwiritsidwe ntchito kuwonjezera mphamvu ya kuzungulira. Ntchito yotumizira yokhudzana ndi mutu. Dongosolo la kumva la munthu limapanga ma spectrum osiyanasiyana a mawu ochokera mbali zosiyanasiyana, ndipo khalidwe la ma spectrum limeneli lingathe kufotokozedwa ndi ntchito yotumizira yokhudzana ndi mutu (HRT). Mwachidule, malo a khutu la munthu amaphatikizapo mbali zitatu: yopingasa, yoyima, ndi yakutsogolo ndi yakumbuyo.

Kuyima molunjika kumadalira kwambiri makutu, kuyima molunjika kumadalira kwambiri chipolopolo cha khutu, ndipo kuyima kutsogolo ndi kumbuyo komanso momwe mawu ozungulira amamvekera kumadalira ntchito ya HRTF. Kutengera ndi zotsatira izi, Dolby surround yodziwika bwino imapanga mawonekedwe ofanana a mafunde a mawu monga gwero lenileni la mawu pa khutu la munthu, zomwe zimathandiza ubongo wa munthu kupanga zithunzi zofanana za mawu molingana ndi malo ozungulira.