Iphi i-audio PCM kwaye kutheni kubalulekile
I-PCM imele i- P ulse C ode M.
I-PCM isetyenziselwa ukuguqula izibonakaliso zomsindo we-analog (ezimele ziimpawu zoguquko) kwiimpawu zomsindo zedijithali (ezimelelwe ngama-1 kunye no-0-zinjengeenkcukacha zekhompyutha) ngaphandle kokunyanzeliswa . Oku kuvumela ukurekhoda komculo okanye i-movietratrack ukuba ifane kwindawo encinane (thelekisa ubukhulu beCD kwirekhodi ye-vinyl).
I-PCM Basics
Ukuguqulwa komsindo we-PCM ukulandelelana kwe-analog kunokuba yinkimbinkimbi, kuxhomekeka kukuphi umxholo oguqulwayo, umgangatho ofunekayo okanye oyifunayo, nokuba uluphi ulwazi olugcinwe, oluhanjiswayo, okanye oluhanjiswayo. Nangona kunjalo, nantsi iisiseko.
Ifayile ye-PCM kukuchazwa kwedijithali yomsindo womsindo we-analog. Injongo kukuphindaphinda izakhiwo zesignali yomsindo we-analog ngokukhawuleza.
Indlela yokuguqulwa kwe-analog-to-PCM yenziwe ngenkqubo ebizwa ngokuba ngumzekelo. Njengoko kuchaziwe ngasentla, isandi se-analog sishukumisela kumaza, ngelixa i-PCM yinkalo ye-1 kunye ne-0. Ukuze uthabathe umsindo we-analog usebenzisa i-PCM, amanqaku athile kwisangqa somsindo kufuneka atyathwe (ubukhulu). Ubuninzi bendlela yokutshintsha isampuli kwinqanaba elinikeziweyo (bits) liyinxalenye yenkqubo. Amanqaku athile amaninzi kunye neengqungquthela ezinkulu zeesampuli zomsindo esicatshulwa kwinqanaba ngalinye lithetha ukuchaneka ngakumbi ekupheleni kokuphulaphula. Umzekelo, kwi-CD yomsindo, ifom ye-analog isampuli 44.1 amawaka ngamawaka ngesibini (okanye 44.1kHz), kunye namanqaku angama 16bits ngobukhulu (ubunzulu). Ngamanye amazwi, umgangatho womsindo wedijithali kwi-CD yomsindo ngu-44.1kHz / 16bits.
I-PCM yeVidiyo yeeMvumi neeKhaya
Uhlobo olulodwa lwe-PCM, ukulungelelaniswa kwe-code kunye ne-modulation code (LPCM), lisetyenziswe kwiCD, iDVD, i-Blu-ray Disc, kunye nezinye izicelo zomsindo we-digital.
Kwi CD, iDVD, okanye umdlali we-Blu-ray Disc, i-LPCM (ngokuqhelekileyo ebizwa ngokuba ngumqondiso we-PCM nje) ifundwa kwi-disc kwaye idluliselwa ngeendlela ezimbini:
- Enye indlela ngokugcina ifom yefomathi yayo nokuthumela loo mqondiso kwi-home receiver receiver nge- digital optical, digital coaxial , okanye i- HDMI uxhumano . Ummkeli ke uguqula uphawu lwe-PCM kwi-analog ukuze ithunyelwe nge-amplifiers nakwizithethi. Isizathu sokuba uphawu lwe-PCM lufanele luguqulwe ku-analog kukuba indlebe yomntu isebenza ngokuvalelwa kweempawu zomsindo we-analog.
- Indlela yesibini i-CD, iDVD, okanye i-Blu-ray Disc player ukuguqula isalathisi se-PCM kwakhona kwifom ye-analog ngaphakathi, ize idlulisele uphawu lwe-analog olwenziwa kwakhona kwi-homeater okanye ummkeli we-stereo ngokusebenzisa uxhumano lwe-analog oluqhelekileyo. Kule meko, umamkeli we-stereo okanye we-homeater akuvumelekanga ukuba enze nayiphi na inguqulelo eyongezelelweyo ukwenzela ukuba uvavane isandi. Abaninzi beCD badlala kuphela ukuxhuma kwe-audio analog, ngoko kuyafuneka ukuba uphawu lwe-PCM kwi-disc luguqulwe ku-analog ngumdlali ngaphakathi. Nangona kunjalo, abanye abadlali beCD (kunye nabo bonke abadlali beDVD kunye ne-Blu-ray Disc) bangadlulisela uphawu lwe audio PCM ngokuzenzekelayo ngokusebenzisa i-digital optical okanye i-digital coaxial connection option. Ukongeza, abaninzi abadlali beDVD kunye ne-Blu-ray Disc banokudlulisa amanqaku e-PCM nge-HDMI uxhumano.
I-PCM, i-Dolby, ne-DTS
Enye inkohliso ininzi yeDVD kunye ne-Blu-ray Disc engenzayo kukufunda i- Dolby Digital okanye i- DTS ifayili. I-Dolby kunye ne-DTS zifomathi zomsindo zedijithali ezisetyenziselwa ukudibanisa i-coding ezixininisa ulwazi ukuze zivumelane nazo zonke iinkcukacha ezizungezile zomsindo kwi-DVD okanye kwi-Disc-Blu. Ngokuqhelekileyo, iifayile zomsindo zeDolby Digital kunye neDTS ezingenakudluliselwa zihanjiswe kumkeli wekhamera yekhaya ukwenzela ukuba uhlaziye phambili kwi-analog-kodwa kukho enye inketho.
Emva kokufundwa kwidiski, abaninzi abadlali beDVD okanye i-Blu-ray Disc bangaphinda baguqule ngaphakathi i-Dolby Digital kunye ne-DTS uphawu kwi-PCM engaxinzekanga, kwaye badlulise isignali esicatshulwa ngqo kwi-home receiver receiver ngokusebenzisa uxhumano lwe-HDMI, okanye ukuguqula uphawu lwe-PCM i-analog ngokuvelisa ngeemveliso ezimbini ze-analog zomculo kwi-home receiver audio receiver eneziphumo ezihambelanayo.
Nangona kunjalo, ekubeni isalathisi se-PCM singagxininiswa, kuthatha indawo ephezulu yokudluliselwa kwebalawidthth. Ngoko ke, ukuba usebenzisa i-digital optical okanye i-coaxial connection, kukho indawo eyaneleyo yokudlulisa iziteshi ezimbini ze-PCM audio. Ukudlala kweCD okwenziwe kakuhle, kodwa i-Dolby Digital okanye i-DTS imiqondiso ejikelezayo eguqulelwe kwi-PCM, kufuneka usebenzise uxhulumaniso lwe-HDMI, njengoko lingadlulisela kwii-8 ze-audio PCM.
Ukufumana okungakumbi malunga nendlela esebenzayo yePCM phakathi komdlali we-Blu-ray ne-home receiver receptor, bhekisa kwi- Blu-ray Disc Player Audio Settings: Bitstream vs PCM .