BT 5.2 Bluetooth LE AUDIO Market
Raws li peb txhua tus paub, ua ntej BT5.2, Bluetooth audio kis tau tus mob siv classic Bluetooth A2DP hom rau cov ntaub ntawv kis mus rau qhov taw tes. Tam sim no qhov tshwm sim ntawm lub suab qis qis LE Audio tau tawg lub monopoly ntawm classic Bluetooth hauv lub lag luam suab. Ntawm 2020 CES, SIG tau tshaj tawm tias tus qauv BT5.2 tshiab txhawb kev sib txuas-raws li ib tus tswv ntau tus qhev suab streaming daim ntawv thov, xws li TWS headphones, ntau chav suab synchronization, thiab tshaj tawm cov ntaub ntawv kwj-raws li kev sib kis, uas tuaj yeem tau dav siv nyob rau hauv tos chav, gymnasiums, rooj sib tham halls, xinesmas thiab lwm qhov chaw nrog pej xeem tshuaj ntsuam suab txais tos.
BT 5.2 LE Audio transmission txoj cai
Bluetooth LE Isochronous Channels feature yog ib txoj hauv kev tshiab ntawm kev hloov cov ntaub ntawv ntawm cov khoom siv Bluetooth LE, hu ua LE Isochronous Channels. Nws muab cov txheej txheem algorithmic los xyuas kom meej tias ntau yam khoom siv tau txais cov ntaub ntawv los ntawm tus tswv synchronously. Nws cov txheej txheem teev tseg tias txhua tus ncej ntawm cov ntaub ntawv xa los ntawm Bluetooth transmitter yuav muaj lub sijhawm, thiab cov ntaub ntawv tau txais los ntawm lub cuab yeej tom qab lub sijhawm yuav raug muab pov tseg. Qhov no txhais tau hais tias lub receiver ntaus ntawv tsuas yog tau txais cov ntaub ntawv nyob rau hauv lub sij hawm siv lub qhov rais, yog li guaranteeing synchronization ntawm cov ntaub ntawv tau txais los ntawm ntau yam qhev pab kiag li lawm.
Txhawm rau kom paub txog txoj haujlwm tshiab no, BT5.2 ntxiv ISOAL synchronization adaptation txheej txheej (Isochronous Adaptation Txheej) ntawm cov txheej txheem pawg tswj hwm thiab tus tswv tsev los muab cov ntaub ntawv kwj segmentation thiab rov tsim cov kev pabcuam.
BT5.2 synchronous cov ntaub ntawv streaming raws li kev sib txuas LE
Kev sib txuas-taw qhia txog isochronous channel siv LE-CIS (LE Connected Isochronous Stream) txoj kev xa mus los txhawb kev sib txuas lus bidirectional. Nyob rau hauv LE-CIS kis tau tus mob, tej pob ntawv tsis kis nyob rau hauv lub sij hawm lub qhov rais yuav muab pov tseg. Kev sib txuas-taw qhia kom paub isochronous channel cov ntaub ntawv streaming muab rau point-to-point synchronous kev sib txuas lus ntawm cov khoom siv.
Kev Txuas Isochronous Pawg (CIG) hom tuaj yeem txhawb nqa ntau cov ntaub ntawv txuas nrog streaming nrog ib tus tswv thiab ntau tus qhev. Txhua pawg tuaj yeem muaj ntau yam CIS. Hauv ib pab pawg, rau txhua CIS, muaj lub sijhawm sib kis thiab tau txais lub sijhawm, hu ua cov xwm txheej thiab cov xwm txheej sub.
Lub sijhawm tshwm sim ntawm txhua qhov xwm txheej, hu ua ISO ntu, tau teev nyob rau hauv lub sijhawm ntawm 5ms txog 4s. Txhua qhov xwm txheej tau muab faib ua ib lossis ntau qhov xwm txheej. Nyob rau hauv qhov kev tshwm sim sub raws li cov ntaub ntawv synchronous kwj kis hom, tus tswv tsev (M) xa ib zaug nrog tus qhev teb raws li qhia.
BT5.2 raws li synchronous kis tau tus mob ntawm connectionless tshaj tawm cov ntaub ntawv kwj
Kev sib txuas lus tsis muaj synchronous siv cov kev tshaj tawm xov xwm synchronization (BIS Broadcast Isochronous Stream) txoj kev sib kis thiab tsuas yog txhawb nqa kev sib txuas lus ib leeg xwb. Tus txais synchronization yuav tsum xub mloog tus tswv tsev AUX_SYNC_IND tshaj tawm cov ntaub ntawv, qhov tshaj tawm muaj ib daim teb hu ua BIG Info, cov ntaub ntawv muaj nyob rau hauv daim teb no yuav raug siv los synchronize nrog BIS xav tau. Tus tshiab LEB-C tshaj tawm xov xwm tswj kev sib txuas lus yog siv rau LL txheej txuas tswj, xws li kev hloov pauv hloov tshiab channel, thiab LE-S (STREAM) lossis LE-F (FRAME) synchronization channel logical txuas yuav siv rau cov neeg siv cov ntaub ntawv ntws thiab cov ntaub ntawv. Qhov zoo tshaj plaws ntawm BIS txoj kev yog cov ntaub ntawv tuaj yeem xa mus rau ntau tus neeg txais kev sib koom ua ke.
Tshaj tawm isochronous kwj thiab pab pawg hom txhawb kev sib kis ntawm cov ntaub ntawv tsis txuas nrog ntau tus txais cov kwj. Nws tuaj yeem pom tias qhov sib txawv loj tshaj ntawm nws thiab CIG hom yog tias hom no tsuas yog txhawb nqa kev sib txuas lus ib leeg xwb.
Cov ntsiab lus ntawm cov yam ntxwv tshiab ntawm BT5.2 LE AUDIO:
BT5.2 tshiab ntxiv xws li ISOAL synchronization adaptation txheej los txhawb LE AUDIO cov ntaub ntawv kwj kis.
BT5.2 txhawb nqa kev thauj mus los tshiab los txhawb kev sib txuas-taw qhia thiab kev sib txuas lus tsis sib xws.
Muaj ib qho tshiab LE Security Mode 3 uas yog tshaj tawm raws li thiab tso cai rau cov ntaub ntawv encryption siv nyob rau hauv kev tshaj tawm sync pawg.
HCI txheej ntxiv ib tug xov tooj ntawm cov lus txib tshiab thiab cov xwm txheej uas tso cai rau synchronization ntawm qhov xav tau kev teeb tsa thiab kev sib txuas lus.
Cov txheej txuas ntxiv ntxiv PDUs tshiab, suav nrog kev sib txuas synchronization PDUs thiab tshaj tawm cov synchronization PDUs. LL_CIS_REQ thiab LL_CIS_RSP yog siv los tsim kev sib txuas thiab tswj cov synchronization ntws.
LE AUDIO txhawb nqa 1M, 2M, CODED ntau tus nqi PHY.
