Application of ANC Technology for TWS Headphones
Txij li thaum Apple launched AirPods nyob rau hauv 2016, cov tshiab qeb ntawm split true wireless (TWS) earphones tau maj mam daws los ntawm kev tsim txiaj ntawm kev yooj yim heev coj mus rau cov neeg siv khoom thiab cov ntsiab lus mob xws li kev sib kis, roj teeb lub neej, thiab tus nqi, detonating ib puag ncig tshiab. kev loj hlob. lag luam ntim. Raws li "Lub Ntiaj Teb Bluetooth Headset Muag thiab Nyiaj Tau Los Huab Cua 2001-2024" kev tshawb fawb qhia tawm los ntawm Strategy Analytics, lub koom haum tshawb fawb thoob ntiaj teb, kev muag khoom ntawm TWS Bluetooth headsets tau nce 200 feem pua hauv 2019, thiab kev lag luam loj ntawm TWS headsets xav kom ncav cuag 100 billion los ntawm 2024. Dollar. Ntawm qhov xwm txheej tsis ntev los no, TWS headsets hauv tsev tseem nyob rau theem ntawm kev loj hlob, thiab cov neeg ua si ntawm txhua qib yuav nkag mus rau hauv kev ua lag luam no.
Lub ANC (Active Noise Cancellation) muaj nuj nqi tau dhau los ua tus qauv ntawm TWS lub mloog pob ntseg vim nws qhov kev ua tau zoo, thiab xav tias ntau tshaj li ib nrab ntawm TWS headphones yuav nruab nrog ANC muaj nuj nqi los ntawm 2023. Yog li ntawd, yuav ua li cas ntxiv cov suab nrov txo qis. muaj nuj nqi rau me me thiab portable TWS earphones yog qhov tseem ceeb ntawm cov tuam txhab earphone tam sim no cov khoom tsim. Raws li lub ntiaj teb ua lag luam ntawm cov ntaub ntawv hloov dua siab tshiab thiab cov teeb liab ua cov cuab yeej siv dav dav hauv kev lag luam, ADI muab kev lag luam tshwj xeeb rau ANC SoC cov kev daws teeb meem, thiab tau siv nyob rau hauv cov flagships ntawm cov tuam txhab suab nrov hauv tsev thiab txawv teb chaws xws li Bose, Baohuaweijian, Wanmo, thiab lwm yam. Nws tau siv dav hauv cov khoom.
Cracking qhov zais cia kom nyob ntsiag to, lub suab nrov-tshem tawm thev naus laus zis mus rau qhov tseem ceeb
Qhov tseeb, rau TWS lub mloog pob ntseg, cov kev xav tau yooj yim tshaj plaws ntawm cov neeg siv yog kev txav mus los thiab lub roj teeb ntev. Nyob rau saum toj no, cov neeg siv cov kev xav tau tseem ceeb yog kev mloog kom meej thiab huv. Niaj hnub no, thaum ib puag ncig lub suab nrov dej nyab peb ntau lub neej scenes txhua lub sijhawm, qhov kev xav tau no tsis yooj yim kom ua tiav, thiab qhov kev thov kom txo suab nrov tau nce siab dua. Txawm hais tias tsis muaj suab nrov txo los ntawm kev kaw lub pob ntseg los tsim qhov chaw kaw, lossis siv cov khoom siv suab nrov xws li silicone earplugs los thaiv cov suab nrov sab nraud tuaj yeem ua lub luag haujlwm zoo hauv kev tawm suab nrov nrov, nws tsis tuaj yeem ua dab tsi rau cov suab nrov tsawg, thiab nws nyob ntawm lub suab nrov tsawg. ntawm Active Noise Cancellation. Lub suab nrov txo kev ua haujlwm yog los tsim cov suab nrov tiv thaiv theem sib npaug ntawm cov suab nrov sab nraud los ntawm cov khoom siv suab nrov txo kom tsis txhob muaj suab nrov, kom ua tiav cov txiaj ntsig ntawm kev txo suab nrov.
Raws li Sophie Mao, active suab nrov txo muaj ob qho tib si analog thiab digital suab ua circuits. Txawm hais tias lub analog Circuit Court muaj qhov qis qis qeeb thiab cov digital circuit muaj qhov ncua sij hawm, lub analog active suab nrov txo Circuit Court muaj ntau yam, loj PCB loj, thiab siab precision yuav tsum, yog li cov suab nrov txo yog lub ntsiab tam sim no. Tsis tas li ntawd, nyob rau hauv cov nqe lus ntawm saj zawg zog, lub analog active suab nrov txo txoj kev yog txwv, feem ntau yog tsom rau lub ntim hloov, thaum lub digital active suab nrov txo yuav optimize lub suab nrov txo cov nyhuv los ntawm kev kho qhov nce, EQ coefficient, thiab hloov kho lub firmware. Qhov sib xws ntawm analog active suab nrov txo Circuit Court yog qhov tsis zoo, thiab nws yuav tsum tau hloov kho thiab calibrated ntau zaus ntawm cov khoom siv; lub suab nrov digital txo qis muaj qhov zoo sib xws, thiab muaj cov cuab yeej hloov kho thiab software kom yooj yim ua tiav cov calibration. Thaum kawg, BOM tus nqi ntawm kev txo qis suab nrov zoo li hauv qab no, tab sis qhov tsis xws luag thiab tus nqi rov ua haujlwm yog siab, thiab tag nrho cov nqi tsim khoom yog siab dua li ntawm cov digital circuits. Yog li ntawd, analog active suab nrov txo yog maj ua ib yam ntawm yav dhau los, thiab cov active suab nrov txo tau los ua lub ntsiab ntawm lub lag luam.
Analog suab nrov txo kev ua Circuit Court vs cov suab nrov txo kev ua Circuit Court
Nyob rau hauv cov nqe lus ntawm kev siv, active suab nrov yuav muab faib ua peb hom: FeedForward, Feedback, thiab ib tug ua ke ntawm ob (Hybrid). Feedforward active suab nrov txo lub mloog pob ntseg feem ntau nyob sab nraud, sau cov suab nrov thiab xa mus rau DSP rau kev ua, thiab tom qab ntawd tso tawm cov suab nrov rov qab rau cov suab nrov txo. Lub microphone ntawm cov lus tawm suab nrov txo lub mloog pob ntseg yog nyob rau hauv kab noj hniav, thiab cov suab nrov uas tau sau thiab tawm tswv yim rau DSP yog qhov pib zoo ib yam li lub pob ntseg hnov, thiab tuaj yeem hloov ncaj qha. Lub hybrid active suab nrov txo combining ob txoj kev yuav ua tau kom sai thiab zoo suab nrov txo. "Tam sim no, txawm hais tias tus nqi ntawm hybrid active suab nrov txo qis dua, raws li tus nqi ntawm cov chips thiab microphones txo qis, cov qauv no tuaj yeem ua rau kev mloog zoo dua yuav yog thawj qhov kev xaiv rau cov tuam txhab." Sophie Mao hais ntxiv. ADI's ADAU1787 SoC kev daws teeb meem muab ib qho 4-channel ADC input interface thiab 4-channel digital microphone input, uas yog tsim rau cov suab nrov-tso tawm lub mloog pob ntseg.
△ANC (Active Noise Cancellation) nti saib xyuas ob lub suab nrov uas tsim los ntawm qhov chaw sab nraud thiab lub suab ua si los ntawm lub mloog pob ntseg los ntawm lub microphone built-in
Chip software modular daws los daws qhov mob tseem ceeb ntawm lub mloog pob ntseg ANC
Yog li ntawd, lub hom phiaj ntawm TWS earphone suab nrov txo yog kom raug sau suab nrov, ceev ceev txheej txheem thiab tso zis tso tseg anti-theem suab nthwv dej, thiab nyob rau tib lub sij hawm muaj qhov tsawg tshaj plaws tau hwj chim noj mus cuag lub roj teeb ntev. Peb qhov tseem ceeb ntawm kev txo suab nrov yog ADC, DSP, thiab DAC. Raws li ADI, uas ib txwm ua tus thawj coj hauv kev ua haujlwm siab zoo analog thiab cov teeb liab ua cov thev naus laus zis, tau txais txiaj ntsig thawj zaug hauv ADC, DAC, thiab DSP, thiab tuaj yeem ua tau zoo. Lub teeb liab microphone rhiab tshaj plaws hauv ANC system, thaum ua kom lub zog siv hluav taws xob tsawg, qhia tau hais tias muaj peev xwm ua tau zoo, thiab tib lub sijhawm qhia nws cov kev txawj ntse hauv cov pob me me thiab siv hluav taws xob tsawg.
