Zifukwa Zomwe Bluetooth Zingachepetsere Mphamvu za Audio
Bluetooth yayamba kukhala njira yowonjezera yosangalala ndi mafilimu opanda waya kupyolera oyankhula ndi matelofoni. Komabe, vuto lina limene ena ali nalo ndilokhudzana ndi Bluetooth komanso kuchepetsa khalidwe labwino. Pali anthu amene amamva kuti - kuchokera kuwona-kumvetsera kwachinsinsi - nthawizonse mumakhala bwino kusankha imodzi yamakina osayendetsedwa opanda Wi-Fi , monga AirPlay, DLNA, Play-Fi, kapena Sonos.
Ngakhale kuti chikhulupilirochi ndi cholondola, pali zambiri zoti mugwiritse ntchito Bluetooth kusiyana ndi momwe mungadziwire.
Bululo silinapangidwe kuti liyambe kujambula, koma kugwirizanitsa makompyuta a m'manja ndi mafoni osayankhula. Chinapangidwanso ndi bandwidth yopapatiza kwambiri, yomwe imalimbikitsa kuti ikhale yogwiritsira ntchito deta ku chizindikiro cha audio. Ngakhale kuti izi zingakhale zabwino kwambiri pa kukambirana kwa foni, sizilibwino kuti abwerere nyimbo. Osati kokha, koma Bluetooth akhoza kugwiritsa ntchito kuponderezedwa pamwamba pa deta zomwe zingakhalepo kale, monga ma fayilo ojambulidwa ndi digito kapena magwero omwe amachokera pa intaneti. Koma chinthu chimodzi chofunikira kukumbukira ndi chakuti machitidwe a Bluetooth sagwiritse ntchito kuponderezedwa kwina. Ndicho chifukwa chake:
Zipangizo zonse za Bluetooth ziyenera kuthandiza SBC (imaimira Low Complexity Subband Coding). Komabe, zipangizo za Bluetooth zingathandizirenso ma codecs omwe angakhale nawo, omwe angapezeke mu mafotokozedwe a Bluetooth Advanced Broadcast Profile (A2DP).
Ma codec omwe mwasankha ndi awa: MPEG 1 & 2 Audio (MP2 ndi MP3), MPEG 3 & 4 (AAC), ATRAC, ndi aptX. Kufotokozera zina mwa izi: Mawonekedwe odziwika bwino a MP3 kwenikweni ndi MPEG-1 Gawo 3, kotero MP3 imaphimbidwa pamtanda ngati codec yokha. ATRAC ndi codec imene imagwiritsidwa ntchito makamaka mu Sony mankhwala, makamaka makamaka mu MiniDisc digito zojambulajambula.
Tiyeni tiwone mizere ingapo kuchokera ku pepala la A2DP, lomwe lingapezeke ngati chipepala cha PDF pa Bluetooth.org.
4.2.2 Zokhazikika za Codecs
Chipangizocho chingathandizenso ma codec osankhidwa kuti apititse patsogolo. Pamene SRC ndi SNK zithandizira codec yokhayokha, kodec iyi ingagwiritsidwe ntchito m'malo mwa chovomerezeka codec.
Mu bukhu ili, SRC imatanthawuza ku chipangizo choyambira, ndipo SNK imatanthawuza chipangizo chomira (kapena kupita). Kotero gwerolo likanakhala foni yanu, piritsi, kapena kompyuta, ndipo kuzama kungakhale bwenzi lanu la Bluetooth, headphones, kapena wolandila.
Izi zikutanthauza kuti Bluetooth siyeneranso kuwonjezera kuwonjezereka kwa deta kuzinthu zomwe zakhala zikulimbikitsidwa kale. Ngati magetsi onse ndi magetsi akuthandizira kodec yomwe imagwiritsidwa ntchito kuti imvetse chizindikiro choyambirira, audio imatha kulandiridwa ndi kulandiridwa popanda kusintha . Choncho, ngati mumvetsera ma MP3 kapena ma AAC omwe mwawasunga pa smartphone yanu, piritsi, kapena kompyuta, Bluetooth siyeneranso kusokoneza khalidwe lakumveka ngati zipangizo zonsezi zimagwirizana ndi mtunduwo.
Lamuloli limagwiranso ntchito pa mailesi a pa intaneti ndi kusindikiza nyimbo zomwe zili mu MP3 kapena AAC, zomwe zimaphatikizapo zambiri zomwe zilipo lerolino. Komabe, mautumiki ena a nyimbo akhala akufufuza machitidwe ena, monga momwe Spotify amagwiritsira ntchito codec ya Ogg Vorbis .
Monga momwe chiwerengero cha intaneti chimawonjezeka patapita nthawi, tikhoza kuona zosankha zambiri komanso zabwino posachedwa.
Koma molingana ndi Bluetooth SIG, bungwe lomwe limaloleza Bluetooth, kupanikizika kumakhalabe kozolowereka tsopano. Izi ndizo chifukwa foni sayenera kutumiza nyimbo zokha komanso zolemba ndi zina zokhudzana ndi maitanidwe. Komabe, palibe chifukwa choti wopanga sakanatha kusintha kuchokera ku SBC ku MP3 kapena ku AAC ngati chipangizo cholandira Bluetooth chichichirikiza. Kotero zidziwitsozo zikanakhala ndi kugwiritsidwa ntchito, koma mbadwa za MP3 kapena AAC mafayilo angadutse zosasinthika.
Nanga Bwanji AptX?
Mtundu wa audio stereo kupyolera mu Bluetooth wakhala bwino pakapita nthawi. Aliyense amene akudziwa zomwe zikuchitika mu Bluetooth wamva za cptec ya aptX , yomwe ikugulitsidwa ngati chithunzithunzi chokhazikika ku codec yovomerezeka ya SBC. Kutchuka kutchuka kwa aptX ndiko kukwanitsa kupereka "ma CD ngati" audio pa Bluetooth opanda waya. Ingokumbukirani kuti zipangizo zonse za Bluetooth ndi zouma ziyenera kuthandizira codec ya aptX kuti ipindule. Koma ngati mukusewera ma MP3 kapena AAC zakuthupi, wopanga akhoza kukhala bwino pogwiritsira ntchito mtundu wobadwa wa fayilo yapachiyambi popanda kuwonjezeranso kachidindo kudzera mu aptX kapena SBC.
Zambiri zamakono zopangidwa ndi Bluetooth sizimangidwa ndi kampani imene antchito awo amavala chizindikiro chawo, koma ndi ODM (wopanga mapangidwe apachiyambi) omwe simunawamvepo. Ndipo wolandila Bluetooth akugwiritsidwa ntchito mu chipangizo cha audio mwina sichinapangidwe ndi ODM, koma ndi winanso winanso. Anthu omwe akhala akugwira ntchitoyi amadziwa kuti chinthu chovuta kwambiri chogwiritsira ntchito digito ndi, ndipo ngati pali alangizi ambiri ogwira ntchito, ndiye kuti palibe amene amadziwa zonse zomwe zikuchitika mkati mwa chipangizocho. Maonekedwe amodzi akhoza kusinthidwa mosavuta, ndipo simungadziwe chifukwa palibe pafupifupi chipangizo cholandirira Bluetooth chomwe chingakuuzeni zomwe mawonekedwe akulowawo ali.
CSR, kampani yomwe ili ndi codec ya aptX, imanena kuti chizindikiro cha audio chovomerezeka cha aptX chimasulidwa momveka pa chingwe cha Bluetooth. Ngakhale kuti aptX ndi mtundu wa kuponderezana, zimayenera kugwira ntchito m'njira yomwe sichikhudzidwa kwambiri ndi kukhulupirika kwachinsinsi (motsutsana ndi njira zina zoponderezera).
Codec ya aptX imagwiritsa ntchito njira yapadera yochepetsera phokoso yomwe imatsindika maulendo onse a audio pamene ikulowetsa deta kupyolera mu Bluetooth "bomba" mosasaka. Deta ya deta ndi yofanana ndi ya CD (16-bit / 44 kHz), choncho chifukwa chake kampani ikufanana ndi aptX ndi "CD-ngati".
Koma ndizofunika kuzindikira kuti sitepe iliyonse yamtundu wa audio imakhudza zotsatira za mawu. Codec ya aptX siingathe kubwezera makutu apamwamba / okamba, ma fayilo omvera otsika otsika / osinthika, kapena mphamvu zosiyanasiyana za ojambula a digito ndi a analog (DACs) omwe amapezeka mu zipangizo. Malo omvetsera ayenera kuganiziranso. Chikhulupiliro chilichonse chomwe chimapangidwa kudzera mwa Bluetooth ndi aptX chikhoza kusokonezedwa ndi phokoso, monga zipangizo zamakono / ma HVAC, magalimoto oyendetsa galimoto, kapena kukambirana komweko. Ndili ndi malingaliro, zingakhale bwino kusankha osankhidwa a Bluetooth pogwiritsa ntchito maonekedwe ndi matepifoni pogwiritsa ntchito chitonthozo m'malo mofanana ndi codec.
Ndikofunika kuzindikira kuti ngakhale Bluetooth (yomwe imagwiritsidwa ntchito mobwerezabwereza) imachepetsanso khalidwe la audio (madigiri), siliyenera. Ndizofunika kwambiri kwa opanga zipangizo kuti agwiritse ntchito Bluetooth m'njira yomwe imakhudza khalidwe la vola laling'ono - kapena makamaka, ayi. Ndiye mukuyenera kulingalira kuti kusiyana kwakukulu pakati pa ma codecs a audio kungakhale kovuta kumva, ngakhale pa dongosolo labwino kwambiri. Nthawi zambiri, Bluetooth sichidzakhudza kwambiri khalidwe la audio la chipangizo. Koma ngati mutakhala ndi malo osungirako zinthu ndipo mukufuna kuchotsa kukayikira konse, nthawi zonse mumakonda nyimbo mukamagwiritsa ntchito chitsime pogwiritsa ntchito chingwe .