TWS headset digital signal ADM
Nrog kev loj hlob tsis tu ncua ntawm TWS (True wireless stereo) headset market. Cov neeg siv cov kev xav tau ntawm cov khoom lag luam kuj tau hloov kho los ntawm kev sib txuas ceev yooj yim mus rau cov qauv siab dua. Piv txwv li, raws li lub xyoo no, ntau tus TWS headsets featuring clear hu tau tshwm sim nyob rau hauv lub lag luam.
Txhawm rau kom muaj kev sib txuas lus meej suab hauv qhov chaw nrov nrov, nws puas tuaj yeem tsim cov tswv yim sib txuas cov teeb liab los ntawm lub pob ntseg sab hauv thiab sab nraud microphones los ua kom muaj kev txawj ntse, ib puag ncig-adaptive sub-band mixer technology. Qhov tseeb, qee lub tuam txhab hauv tsev thiab txawv teb chaws tau cog lus rau qhov no, thiab tau ua tiav qee qhov txiaj ntsig.
Tau kawg, ntau lub tuam txhab kev daws teeb meem tam sim no muaj kev tshwj xeeb rau kev hu suab nrov txo cov kev daws teeb meem xws li ntug AI (qhov no yog ib qho), tab sis qhov tseeb, nws tau zoo dua rau cov kev daws teeb meem uas twb muaj lawm, yog li qhov no tau muab tshem tawm, cia peb saib. qee qhov tseem ceeb ua ntej Qhov kev taw qhia, uas yog, qhov kev hu suab nrov txo tau ua li cas.
Zuag qhia tag nrho, hu suab nrov txo kev cia siab rau Uplink (uplink) thiab Downlink (downlink) synchronization. Roughly Microphone Array / AEC / NS / EQ / AGC / DRC, kev sib raug zoo yog raws li hauv qab no:
ADM (Adaptive Directional Microphone Array) yog lub teeb liab digital ua tshuab uas tsim cov kev taw qhia lossis suab nrov tshem tawm lub microphone siv tsuas yog ob lub omnidirectional microphones. ADM tau hloov nws cov kev taw qhia cov yam ntxwv los muab lub suab nrov zoo attenuation nyob rau hauv ntau qhov chaw thaum tuav cov teeb liab txaus. Cov txheej txheem yoog tau nrawm, muaj kev xaiv ntau zaus, thiab tuaj yeem tshem tawm ntau yam cuam tshuam ib txhij.
Ntxiv nrog rau nws cov kev taw qhia zoo, ADMs muaj kev cuam tshuam rau cua suab nrov dua li cov kab lus acoustic directional microphones. ADM thev naus laus zis tso cai rau ob hom microphone teeb tsa: "endfire" thiab "broadfire".
Hauv kev teeb tsa hluav taws xob kawg, lub teeb liab qhov chaw (tus neeg siv lub qhov ncauj) yog nyob ntawm axis (kab txuas ntawm ob lub microphones). Nyob rau hauv ib tug dav configuration, nws tsom ib txoj kab ncaj nraim ntawm kab rov tav axis.
Hauv kev teeb tsa qhov kawg, ADM muaj ob hom kev ua haujlwm; "far-talk" thiab "ze-talk". Nyob rau hauv hom far-pass, ADM ua raws li kev pom zoo ntawm lub microphone, attenuating lub teeb liab ntawm lub nraub qaum thiab sab thaum khaws cov teeb liab los ntawm sab xub ntiag. Hauv hom kev sib tham ze, ADM ua raws li lub suab nrov tshaj plaws-tshem tawm lub microphone, tshem tawm cov suab nyob deb. Txoj kev ywj pheej ntawm kev tsim acoustic ua rau ADMs zoo tagnrho rau cov xov tooj ntawm tes, uas tso cai rau "mos" hloov ntawm cov neeg hais lus nyob deb thiab cov neeg hais lus nyob ze. Txawm li cas los xij, thaum hom kev tsim no siv rau ntawm pob ntseg, tshwj xeeb tshaj yog TWS earphones, nws raug txwv ntau dua los ntawm seb tus neeg siv hnav nws raug. Zoo ib yam li airpods, tus sau tau pom tias muaj coob tus neeg muaj "txhua yam kev coj txawv txawv" hauv txoj kev hauv subway, qee qhov yog cov neeg siv pob ntseg. Cov duab, thiab qee qhov kev coj cwj pwm, ua rau lub algorithm tsis tas yuav ua haujlwm hauv qhov xwm txheej zoo tagnrho.
Acoustic Echo Canceller (AEC)
Thaum ib feem ntawm lub teeb liab nyob rau hauv ib tug duplex (ib txhij ob-txoj kev) kev sib txuas lus rov qab mus rau qhov chaw teeb liab, nws yog hu ua "echo". Nyob rau hauv qhov ntev-ntev analog thiab yuav luag tag nrho cov kev sib txuas lus digital, txawm tias cov suab paj nruag me me tuaj yeem ua rau muaj kev cuam tshuam vim muaj kev cuam tshuam loj heev.
Nyob rau hauv lub suab sib txuas lus davhlau ya nyob twg, acoustic echoes yog tsim los ntawm acoustic coupling ntawm tus neeg hais lus thiab lub microphone. Vim tias qhov kev ua haujlwm tsis raug siv hauv kev sib txuas lus, xws li cov vocoders poob thiab kev hloov pauv, cov suab paj nruag yuav tsum tau ua tiav hauv zos (tso tseg) hauv lub cuab yeej.
Noise Suppressor (NWS)
Cov cuab yeej siv suab nrov txo cov suab nrov nyob ruaj khov thiab ntu ntu hauv ib leeg-channel hais lus teeb liab, txhim kho cov teeb liab-rau-suab nrov piv, txhim kho kev txawj ntse hais lus, thiab txo qhov hnov lus nkees.
Tau kawg, muaj ntau txoj hauv kev tshwj xeeb hauv ntu no, xws li BF (Beamforming), lossis PF (Post filter) thiab lwm yam kev hloov kho. Feem ntau, AEC, NS, BF, thiab PF yog qhov tseem ceeb ntawm kev hu suab nrov txo. Nws yog qhov tseeb tias txhua qhov kev daws teeb meem algorithm muaj qhov zoo thiab qhov tsis zoo sib txawv.
Nyob rau hauv ib qho kev sib txuas lus lub suab, theem ntawm lub suab teeb liab yuav sib txawv vim qhov kev ncua deb ntawm tus neeg siv thiab lub microphone, thiab vim yog cov yam ntxwv ntawm kev sib txuas lus channel.
Dynamic Range Compression (DRC) yog qhov yooj yim tshaj plaws kom sib npaug ntawm cov teeb liab. Compression txo qhov dynamic ntau yam ntawm lub teeb liab los ntawm kev txo qis (compressing) cov lus muaj zog ntu thaum khaws cia cov lus tsis muaj zog. Yog li ntawd, tag nrho cov teeb liab tuaj yeem nthuav dav ntxiv kom cov teeb liab tsis muaj zog tuaj yeem hnov zoo dua.
AGC thev naus laus zis digitally ua kom cov teeb liab nce (amplification) thaum lub suab teeb liab tsis muaj zog, thiab compresses nws thaum lub suab teeb liab muaj zog. Hauv qhov chaw nrov nrov, tib neeg nyiam hais lus nrov dua, thiab qhov no cia li teeb tsa lub microphone channel nce mus rau tus nqi me me, yog li txo cov suab nrov hauv ib puag ncig thaum khaws lub suab ntawm kev txaus siab ntawm qib zoo. Tsis tas li ntawd, nyob rau hauv ib qho chaw ntsiag to, tib neeg hais lus nyob ntsiag to kom lawv lub suab tau nthuav dav los ntawm algorithm yam tsis muaj suab nrov heev.
Post lub sij hawm: Jun-07-2022
