Incazelo ejulile ye-Bit kanye nencazelo
Ngomsindo we-digital, kuzomele kube khona inani elithile elibekelwe ukuchaza isinqumo semininingwane yomsindo (amasampula) okumele athunyelwe futhi agcinwe kufayela elilalelwayo. Lesi sici sibizwa ngokuthi ukujula.
Ngokufanayo, ukuze uthole amafayela wesithombe namavidiyo, lobu bubanzi bokulinganisa busetshenziselwa ukunquma ukuxazulula isithombe. Ukuphakama ukujula kancane (isib. 16 bit kuya ku-24 bit) kungcono isithombe sizoba ngcono.
Lesi sici sinjalo ngokulalelwayo kwedijithali ngakho-ke ukujula okuphezulu okulalelwayo kuzonikeza ukuqoshwa komsindo okuningiliziwe.
Ukujula kwe- bit ngokuvamile kuvame ukudideka kancane kancane , kodwa kuhluke kakhulu. Isilinganiso se-Bit (kulinganiswa ku- Kbps ) yi-passput yedatha ngomzuzwana lapho umsindo udlalwa emuva, futhi akusona isisombululo sampula ngayinye ecacile eyenza isimo somsindo somsindo. Bheka Ukujula Kwe-Bit Ukulinganiswa Kwe-Bit ngolwazi oluthe xaxa.
Qaphela: Ukujula kwe-Bit ngezinye izikhathi kubizwa ngokuthi ifomethi yesampula, isinqumo sokulalelwayo, noma ubude begama.
Ukwaziswa okwengeziwe mayelana nokujula kwamanzi
Iyunithi yesilinganiso ngokujula kancane kuzinombolo zamabhanari (ama-bits) nakuzo zonke ukwanda kwe-1-bit, ukunemba kuphindwe kabili. Lolu luhlu oluncane luyinani elibalulekile elinquma ukuthi ukurekhoda okuhle (isici somculo njengesibonelo) kuzwakala kanjani.
Uma ukujula kancane kuphansi kakhulu, ukuqopha ngeke kube nenembile kakhulu futhi imisindo eminingi enokuthula ingalahleka. Ngezingoma ezakha ilabhulali yakho yomculo wedijithali, ama-MP3s afakwe ikhodi yefomethi ye- PCM yomsindo (ngokuvamile i- WAV ) ngokujula okuphezulu kuzoqukatha ama-frequency amaningi kakhulu uma kuqhathaniswa nalabo abafakwe ikhodi kusuka kumafayela okuqala we-PCM kancane kancane.
Ngakho-ke, kuzoba khona ngokunembile kakhulu kokudlala. Njengoba kuchazwe ngaphambilini, ukujula kancane kubaluleke nakakhulu uma kusebenza ama-harmonics athulile ezintweni - ukusebenzisa ukujula kancane kancane kungabangela ama-frequencies alahlekile.
Ukujula kwe-Bit kuyadingeka kuphela lapho kutholakala isignali ye-PCM, ngakho-ke amafomethi okulahla okulahlekelwa okulahlekile akunawo okujulile.
Ezinye Izindlela Ukujula Kwamanzi kuthinta izinga lomsindo
Ukuqinisekisa ukuthi amafayela akho alalelwayo adijithali awahluleki ngokuchofoza kubalulekile, kodwa ukujula okujulile kuyisici esibucayi okufanele ucabange ngakho ukuze unciphise inani lomsindo wangemuva.
Yonke into yokurekhoda ine-interference yesignali (ebizwa ngokuthi i-noise floor) engagcinwa okungenani uma usebenzisa ukujula okwanele. Lokhu kungenxa yokuthi ububanzi obushukumisayo (umehluko phakathi kokuzwakala okukhulu nokuzwakala okuthulile) kuzoba ngaphezulu kakhulu kunomsindo womsindo, okuvumela umehluko ukugcina umsindo okungenani.
Ukujula kwe-bit futhi kunquma ukuthi ukurekhoda okunamandla kuyoba kanjani. Ngokwenyuka kokuncane kwe-1, kunesilinganiso esingu-6 dB sobubanzi obuningi obangeziwe. Ifomethi ethandwa kakhulu yabezindaba esetshenziswa namuhla yi-CD yomsindo, osebenzisa kancane ukujula kwe-16, okulingana no-96 dB wobubanzi obunamandla. Uma i-DVD noma i-Blu-ray isetshenzisiwe, ikhwalithi yomsindo iphakeme ngoba ukujula kancane okusetshenzisiwe kuyisi-24, okunikeza u-144 dB wobubanzi obunamandla.