Vim Li Cas Vim Li Cas Bluetooth Yuav Kom Txawj Zoo Siab
Bluetooth tau ceev nrooj los ua txoj kev zoo tshaj plaws kom txaus siab rau wireless suab los ntawm kev hais lus thiab lub mloog pob ntseg. Txawm li cas los xij, ib qho kev txhawj xeeb uas qee cov neeg muaj feem xyuam nrog Bluetooth thiab txo tag nrho cov suab nrov. Muaj cov neeg uas xav tias - los ntawm kev mloog lus ncaj ncees - koj nyob nraum zoo dua xaiv xaiv qhov Wi-Fi-raws wireless technologies , xws li AirPlay, DLNA, Play-Fi, los yog Sonos.
Thaum kev ntseeg ntawd feem ntau yog lawm, muaj ntau yam siv Bluetooth tshaj qhov koj yuav paub.
Bluetooth yog Ameslikas tsis tsim rau kev lom zem, tiam sis kom txuas lub xov tooj thiab cov xov tooj sib tham. Nws kuj tsim los nrog ib tus kab nro nqaim heev, uas yuam kom nws siv cov ntaub ntawv sib txuam rau lub teeb liab. Thaum no tej zaum yuav zoo rau kev sib tham hauv xov tooj, nws tsis zoo rau kev luam suab paj nruag. Tsis tas li ntawd xwb, tab sis Bluetooth yuav tau tso npe rau qhov kev ywj pheej no rau saum toj ntawm cov ntaub ntawv ceev xwm txheej uas tau tshwm sim, xws li los ntawm cov suab ntaub ntawv los yog cov chaw uas siv los ntawm Internet. Tab sis muaj ib qho tseem ceeb tshaj plaws uas yuav tsum nco ntsoov yog tias tus kab mob Bluetooth tsis tas yuav siv qhov kev sib ntxiv no ntxiv. Ntawm no yog vim li cas:
Txhua Bluetooth cov khoom siv yuav tsum txhawb SBC (sawv rau Qis Complexity Subband Coding). Txawm li cas los, Bluetooth cuab yeej kuj yuav txhawb kev xaiv codecs, uas tuaj yeem pom nyob rau hauv Bluetooth Advanced Audio Distribution Profile (A2DP) specification.
Cov kev xaiv codecs uas teev tseg yog: MPEG 1 thiab 2 Suab (MP2 thiab MP3), MPEG 3 & 4 (AAC), ATRAC, thiab aptX. Kom paub meej txog ob peb yam: Cov paub MP3 hom yog MPEG-1 Layer 3, yog li MP3 tau them nyob rau hauv cov spec raws li kev xaiv tsa codec. ATRAC yog lub codec uas tau siv feem ntau ntawm cov khoom siv hauv Sony, feem ntau tsim nyog hauv MiniDisc cov ntaub ntawv teev cov ntaub ntawv.
Cia wb saib ob peb kab ntawm A2DP spec sheet, uas tuaj yeem pom muaj raws li PDF document rau Bluetooth.org.
4.2.2 Yeem Codecs
Cov cuab yeej tseem yuav txhawb kev xaiv cov codecs kom pom tseeb tshaj qhov nws siv tau. Thaum ob qho tib si SRC thiab SNK txhawb tib lub codec xaiv, qhov codec no yuav siv tsis txhob yuav tsum tau codec.
Nyob rau hauv daim ntawv no, SRC yog hais txog qhov khoom siv, thiab SNK yog hais txog lub dab dej (los yog cov chaw). Yog li ntawd lub hauv paus yuav yog koj lub smartphone, ntsiav tshuaj, los yog lub computer, thiab lub dab ntxuav muag yuav yog koj tus Bluetooth hais lus, lub mloog pob ntseg, los yog receiver.
Qhov no txhais tau hais tias Bluetooth tsis tas yuav tsum tau ntxiv cov ntaub ntawv ntxiv compression rau cov khoom uas twb compressed. Yog tias ob qho chaw thiab cov twj siv tog hauv lub raj siv lub codec siv los encode thawj lub teeb liab, lub suab yuav kis tau thiab tau txais yam tsis hloov . Yog li, yog hais tias koj mloog MP3 lossis AAC cov ntaub ntawv uas koj tau khaws tseg rau hauv koj lub xov tooj, ntsiav tshuaj, los yog lub computer, Bluetooth tsis tas yuav thuam lub suab zoo yog tias ob qho kev txhawb nqa hom ntawv ntawd.
Txoj cai no kuj siv tau rau internet xov tooj cua thiab streaming suab paj nruag cov kev pab cuam uas yog encoded hauv MP3 lossis AAC, uas yog siv ntau yam ntawm hnub no. Txawm li cas los xij, qee cov kev pab cuam suab paj nruag tau tshawb txog lwm hom ntawv, xws li Spotify siv lub Ogg Vorbis codec .
Raws li tag nrho internet bandwidth nce ntau lub sij hawm, peb yuav pom ntau thiab zoo dua kev xaiv yav tom ntej.
Tab sis raws li Bluetooth SIG, lub koom haum uas tso cai rau Bluetooth, compression tshua tus cai rau tam sim no. Qhov no tsuas yog vim hais tias lub xov tooj yuav tsum muaj peev xwm xa tawm tsis yog tsuas yog suab paj nruag, tiam sis tseem rings thiab lwm cov kev ceeb toom hauv kev hu. Tseem, tsis muaj ib qho laj thawj uas lub khw yuav hloov tsis tau ntawm SBC los sis MP3 compression yog tias tus txais txiaj ntsig Bluetooth txhawb nws. Yog li cov ntawv qhia yuav muaj cov compression hos, tiam sis haiv neeg MP3 lossis AAC cov ntaub ntawv yuav dhau hloov tsis tau.
Hais txog aptX?
Qhov zoo ntawm lub tso suab suab los ntawm Bluetooth tau zoo dua lub sijhawm. Tus neeg twg yog tus cognizant ntawm qhov tshwm sim hauv Bluetooth tau hnov ntawm lub aptX codec , uas yog kev ua lag luam raws li kev kho kom haum rau SBC codec cai. Cov ntaub ntawv rau koob meej rau aptX yog nws lub peev xwm xa "CD zoo li" suab zoo dua Bluetooth wireless. Tsuas nco ntsoov hais tias ob qho tib si ntawm Bluetooth qhov chaw thiab cov twj siv twj ywm yuav tsum txhawb cov aptX codec kom tau txiaj ntsig. Tab sis yog tias koj tab tom ua si hauv MP3 lossis AAC, cov chaw tsim hluav taws xob yuav zoo dua siv hom ntawv ntawm cov ntaub ntawv lub suab yam tsis tau rov qab ntxiv encoding los ntawm aptX los yog SBC.
Feem coob ntawm cov khoom siv suab paj nruag (Bluetooth audio products) ua tsis yog los ntawm lub tuam txhab uas lawv cov neeg ua hauj lwm hnav lawv lub npe, tab sis los ntawm ODM (tus tsim qauv tsim) koj yeej tsis tau hnov ntawm. Thiab lub Bluetooth receiver siv nyob rau hauv ib qho khoom suab tej zaum tsis yog los ntawm ODM, tab sis los ntawm tsis tau lwm qhov chaw tsim tshuaj. Cov neeg uas tau nyob hauv kev lag luam kawm tias qhov ntau cov khoom digital, thiab yog hais tias muaj ntau tus engineers ua haujlwm rau nws, qhov ntau dua nws yog tias tsis muaj leej twg paub txhua yam txog dab tsi tiag tiag mus hauv lub cuab. Ib hom ntawv tau yooj yim yuav tsum tau transcoded rau lwm tus, thiab koj yeej tsis paub nws vim hais tias tsis muaj Bluetooth tsis tau txais lub cuab tam yuav qhia koj seb cov khoom ntaus ntawv yog.
CSR, lub lag luam uas muaj tus aptX codec, neeg pab leg ntaubntawv uas lub aptX enabled audio teeb liab yog tauj transparently hla Bluetooth txuas. Txawm hais tias aptX yog ib hom compression, nws yuav tsum tau ua hauj lwm nyob rau hauv ib txoj kev uas tsis zoo heev feem cuam fidelity (tiv thaiv lwm txoj kev compression).
Lub aptX codec siv cov txheej txheem tshwj xeeb txo qhov tshwj xeeb uas yog siv ntau zaus ntawm lub suab thaum tso cov ntaub ntawv kom haum los ntawm Bluetooth "yeeb nkab" wirelessly. Cov ntaub ntawv tus nqi yog sib npaug li ntawm ib lub suab paj nruag CD (16-ntsis / 44 kHz), li no vim li cas lub tuam txhab equates aptX nrog "CD zoo li" lub suab.
Tab sis nws yog qhov tseem ceeb kom paub txog tias txhua kauj ruam ntawm lub suab saw cuam tshuam ntawm qhov tso tawm suab. Lub aptX codec tsis tuaj yeem compensate rau cov lag luam zoo dua qub / hais lus, qis dua cov ntaub ntawv suab / qhov chaw, lossis qhov kev hloov ntawm digital-to-analog hloov dua siab tshiab (DACs) muaj nyob hauv cov khoom siv. Qhov kev mloog kev xav tau pom zoo thiab. Txawm hais tias kev ncaj ncees tau txais txiaj ntsig los ntawm Bluetooth nrog aptX tuaj yeem tsim tsis tau ntawm suab nrov, xws li khiav khoom siv / HVAC, tsheb khiav tsheb, lossis sib tham nyob ze. Nrog nco, tej zaum nws yuav tsim nyog xaiv Bluetooth tham raws li cov nta thiab lub mloog pob ntseg raws li kev nplij siab uas tsis yog cov codec compatibility.
Nws tseem ceeb heev uas yuav tsum paub tias thaum uas Bluetooth (raws li cov uas tau siv ua) nws txo qhov suab zoo (kom ua ntau yam), nws tsis tas yuav. Nws yog feem ntau ntawm cov kws kho mob siv Bluetooth siv rau hauv txoj kev uas cuam tshuam zoo suab qhov tsawg tshaj plaws - los yog dua li, tsis nyob txhua qhov. Tom qab ntawd koj yuav tsum xav txog tias qhov sib txawv me ntsis ntawm cov suab codec yuav nyuaj rau koj hnov, txawm tias ntawm txoj kev zoo tiag tiag. Feem ntau, Bluetooth yuav tsis muaj feem cuam tshuam rau ntawm lub suab zoo ntawm lub suab nrov. Tab sis yog tias koj tau muaj kev tshwj tseg thiab xav tshem tawm tag nrho cov tsis ntseeg, koj yeej ib txwm nyiam cov suab paj nruag los ntawm kev siv cov chaw siv lub suab .