Yawan fasalin AAC ya sa ya fi kyau a duk yanayi?
Kuna iya tunanin Apple yana da alhakin bunkasa tsarin AAC Plus (wani lokaci ana kira AAC +). Amma, shi ne, a gaskiya, sunan kasuwancin da Coding Technologies ke amfani dashi don tsarin tsarin su na HE-AAC V1. Idan kana tunanin abin da ya kasance na sunan yana nufin, to, yana da gajeren gajere. A gaskiya ma, AAC Plus ana kiransa HE-AAC maimakon amfani da sunan da ake kira ko + alama.
Hotunan fayilolin fayil ɗin da aka haɗa da AAC Plus sune:
- .m4a
- .MP4
- ., M4b
- .m4V
Amma, menene bambanci tsakanin wannan da tsarin AAC na yau da kullum ?
Babban manufar HE-AAC (Babban Haɗin Ayyukan Cikakken Kasuwanci) shine lokacin da ake buƙatar sautin murya a cikin ƙananan rates. Ɗaya daga cikin misalan mafi kyawun wannan shine lokacin da ake buƙata waƙoƙi a kan Intanet ta amfani da adadin kuɗi na yiwuwar bandwidth. Idan aka kwatanta da ma'auni na AAC ya fi kyau a kiyaye adalcin da aka sani a bit rates kasa da 128 Kbps - mafi yawanci a kusa da 48 Kbps ko žasa.
Kuna iya ɗauka cewa yana da mafi alhẽri a hada sauti a cikin ƙananan rates kuma. Bayan haka, ba Ƙarin bayan AAC (ko HE a gabaninsa) ba ka fahimci cewa ya fi kyau duka?
Abin baƙin ciki wannan ba haka bane. Babu tsarin da zai iya zama mai kyau a komai kuma wannan shine inda AAc Plus yana da hasara idan aka kwatanta da misali AAC (ko ma MP3). Lokacin da kake so ka adana ingancin rikodin rikodi ta amfani da codec mai ɓata , to, yana da kyau a yi amfani da AAC mai kyau yayin da ake yin bitar kuma girman fayilolin ba babban batu naka ba ne.
Hadishi tare da iOS da Android na'urorin
Haka ne, mafi yawan (idan ba duka) na'urori masu ɗaukar hoto da suke dogara da iOS da Android za su iya raba sauti a cikin tsarin AAC Plus.
Don na'urorin iOS fiye da version 4, An tsara fayilolin AAC Plus tare da iyakar inganci. Idan kana da na'urar Apple wadda ta fi girma fiye da wannan, to har yanzu za ka iya sake kunna waɗannan fayiloli, amma za a sami raguwa a cikin aminci. Wannan shi ne saboda SBR ɓangaren, wanda ya ƙunshi cikakkun bayanai (treble), ba a yi amfani da shi lokacin da aka tsara ba. Za'a kula da fayilolin kamar suna da alamar AAC-LC (Low Complexity AAC).
Ta yaya Game da Masu Gidan Telebijin?
Siffofin watsa labaru na software kamar iTunes (version 9 da mafi girma) da kuma Winamp (pro version) suna goyan bayan ƙaddamar da ƙaddamar da AAC Plus. Yayinda wasu software kamar VLC Media Player da Foobar2000 zasu iya kunna fayilolin mai kunnawa HE-AAC kawai.
Ta yaya Siffofin Kasuwanci na Ƙarshe ya dace?
AAC Plus algorithm (wanda ake amfani dashi ta hanyar raɗaɗa waƙa irin su Pandora Radio), yana amfani da fasahar da ake kira Spectral Band Replication (SBR) don bunkasa sauti na audio yayin da ya ƙaddamar da dacewar matsawa. Wannan tsari na ainihi yana nuna alamun ƙananan haɓaka ta hanyar haɓaka ƙananan ƙananan hanyoyi - an adana waɗannan a 1.5 Kbps. Ba zato ba tsammani, ana amfani da SBR a wasu tsarin kamar MP3Pro.
Gudurawa Audio
Har ila yau, 'yan wasan kafofin watsa labarai na labaran da ke goyon bayan AAC Plus, ayyukan layi na layi kamar Pandora Radio da aka ambata a baya (da sauran ayyukan radiyo na Intanet) na iya amfani da wannan tsari don sauke abun ciki. Yana da tsari mai mahimmanci na jijiyo don amfani saboda ƙananan bukatun bandwidth - domin watsa shirye-shirye musamman musamman inda ko da yake low 32 Kbps ne kullum m quality.