Hauv kev siv lub suab ib puag ncig, Dolby AC3 thiab DTS muaj cov yam ntxwv uas lawv xav tau ntau tus neeg hais lus thaum rov ua haujlwm.Txawm li cas los xij, vim yog tus nqi thiab qhov chaw, qee cov neeg siv, xws li cov neeg siv computer multimedia, tsis muaj cov neeg hais lus txaus.Lub sijhawm no, yuav tsum muaj kev siv thev naus laus zis uas tuaj yeem ua cov teeb liab ntau-channel thiab ua si lawv rov qab rau hauv ob qho tib si hais lus, thiab ua rau tib neeg hnov ​​​​cov suab nrov ib puag ncig.Qhov no yog virtual surround suab tshuab.Lub npe Askiv rau lub suab virtual yog Virtual Surround, tseem hu ua Simulated Surround.Tib neeg hu qhov thev naus laus zis no tsis yog tus qauv puag ncig lub suab tshuab.

Lub suab tsis zoo ib puag ncig yog raws li ob-channel tso suab tsis ntxiv cov channel thiab hais lus.Lub suab teb teeb liab yog ua tiav los ntawm lub voj voog thiab tom qab ntawd tshaj tawm, kom cov neeg mloog tuaj yeem hnov ​​​​tias lub suab los ntawm ntau cov lus qhia thiab tsim ib qho chaw simulated stereo.Tus nqi ntawm virtual surround suab Tus nqi ntawm virtual surround thev naus laus zis yog siv ob tus neeg hais lus los simulate lub suab ib puag ncig.Txawm hais tias nws tsis tuaj yeem muab piv nrog lub tsev ua yeeb yam tiag tiag, cov txiaj ntsig zoo hauv qhov zoo tshaj plaws mloog.Nws qhov tsis zoo yog tias nws feem ntau tsis sib haum nrog kev mloog.Cov kev xav tau ntawm lub suab yog siab, yog li siv lub tshuab virtual puag ncig rau lub mloog pob ntseg yog qhov kev xaiv zoo.

Nyob rau hauv xyoo tas los no, tib neeg tau pib kawm txog kev siv cov channel tsawg tshaj plaws thiab cov neeg hais lus tsawg tshaj plaws los tsim cov suab peb sab.Cov nyhuv suab no tsis yog qhov tseeb raws li paub tab ib puag ncig suab thev naus laus zis xws li DOLBY.Txawm li cas los xij, vim nws tus nqi qis, cov thev naus laus zis no tau siv ntau dua hauv lub zog amplifiers, TVs, tsheb suab thiab AV multimedia.Cov tshuab no hu ua non-standard surround sound technology.Lub suab tsis zoo ib puag ncig yog raws li ob-channel tso suab tsis ntxiv cov channel thiab hais lus.Lub suab teb teeb liab yog ua tiav los ntawm lub voj voog thiab tom qab ntawd tshaj tawm, kom cov neeg mloog tuaj yeem hnov ​​​​tias lub suab los ntawm ntau cov lus qhia thiab tsim ib qho chaw simulated stereo.

Virtual Surround Sound Principple Tus yuam sij kom paub txog virtual Dolby Surround Sound yog kev ua haujlwm ntawm lub suab.Nws tshwj xeeb hauv kev ua cov suab ib puag ncig raws li tib neeg lub cev lub cev acoustics thiab psychoacoustic cov hauv paus ntsiab lus, tsim qhov kev xav tias lub suab ib puag ncig los ntawm qab lossis rau sab ntawm tus mloog.Muaj ob peb qhov teebmeem raws li cov hauv paus ntsiab lus ntawm tib neeg lub rooj sib hais.Cov nyhuv Binaural.British physicist Rayleigh tau tshawb pom los ntawm kev sim hauv 1896 tias ob lub pob ntseg tib neeg muaj lub sijhawm sib txawv (0.44-0.5 microseconds), lub suab sib txawv thiab theem sib txawv rau cov suab ncaj qha los ntawm tib lub suab.Qhov kev hnov ​​​​mob ntawm tib neeg pob ntseg tuaj yeem txiav txim siab raws li cov me me no Qhov txawv tuaj yeem txiav txim siab qhov kev taw qhia ntawm lub suab thiab txiav txim siab qhov chaw ntawm lub suab, tab sis nws tsuas yog txwv rau kev txiav txim siab lub suab hauv kab rov tav pem hauv ntej. , thiab tsis tuaj yeem daws qhov chaw ntawm peb-dimensional spatial suab qhov chaw.

Auricular nyhuv.Tib neeg auricle plays lub luag haujlwm tseem ceeb hauv kev xav ntawm lub suab nthwv dej thiab kev taw qhia ntawm qhov chaw suab nrov.Los ntawm cov nyhuv no, peb-dimensional txoj hauj lwm ntawm lub suab nrov tuaj yeem txiav txim siab.Kev lim dej ntau zaus ntawm tib neeg pob ntseg.Lub suab localization mechanism ntawm tib neeg pob ntseg muaj feem xyuam rau lub suab zaus.Cov ntses bass thaj tsam ntawm 20-200 Hz yog nyob ntawm theem sib txawv, qhov nruab nrab ntawm 300-4000 Hz yog nyob ntawm lub suab sib txawv, thiab cov treble nyob ntawm lub sijhawm sib txawv.Raws li lub hauv paus ntsiab lus no, qhov sib txawv ntawm cov lus thiab suab paj nruag hauv lub suab replayed tuaj yeem txheeb xyuas, thiab cov kev kho mob sib txawv tuaj yeem siv los ua kom muaj kev nkag siab ntawm ib puag ncig.Lub taub hau ntsig txog kev hloov pauv ua haujlwm.Tib neeg kev hnov ​​​​lus tsim cov spectrums sib txawv rau cov suab los ntawm cov lus qhia sib txawv, thiab qhov spectrum yam ntxwv no tuaj yeem piav qhia los ntawm lub taub hau ntsig txog kev hloov pauv (HRT).Piv txwv li, lub spatial positioning ntawm tib neeg pob ntseg muaj xws li peb cov lus qhia: kab rov tav, ntsug, thiab pem hauv ntej thiab nram qab.

Kab rov tav txoj hauj lwm feem ntau yog nyob ntawm pob ntseg, txoj hauj lwm ntsug feem ntau yog nyob ntawm pob ntseg plhaub, thiab pem hauv ntej thiab nram qab qhov chaw thiab kev xaav ntawm lub suab ib puag ncig cia siab rau HRTF muaj nuj nqi.Raws li cov teebmeem no, virtual Dolby ib puag ncig tsim tsim tib lub suab yoj lub xeev raws li lub suab tiag tiag ntawm tib neeg pob ntseg, tso cai rau tib neeg lub hlwb los tsim cov duab suab sib xws hauv qhov sib thooj spatial orientation.