Ntchito yochepetsera phokoso ndiyofunikira kwambiri pamakutu.Chimodzi ndicho kuchepetsa phokoso ndi kupewa kukulitsa mphamvu ya mawu, kuti makutu asamawonongeke.Chachiwiri, sefa phokoso kuti muwongolere kumveka kwa mawu komanso kuyimba bwino.Kuchepetsa phokoso kumagawika mu kuchepetsa phokoso logwira ntchito komanso kuchepetsa phokoso lopanda phokoso.
Kuchepetsa phokoso potengera mfundo zakuthupi: Zomvera zam'mutu zimagwiritsidwa ntchito kukulitsa ndikukulunga khutu lonse kuti muchepetse phokoso.Iwo ali ndi zofunika kwambiri zipangizo, osauka permeability mpweya ndipo si zophweka kuti ziume pambuyo thukuta.Mtundu wa khutu "umayikidwa" mu ngalande ya khutu kuti atseke ngalande ya khutu kuti achepetse phokoso.Ndizosautsa kuvala kwa nthawi yayitali, kupanikizika mkati ndi kunja kwa ngalande ya khutu kumakhala kosagwirizana, ndipo nthawi yovala sikuyenera kukhala yayitali, yomwe idzakhudza kumva.
Kuchepetsa phokoso logwira ntchito kumatheka posanthula chip mumutu.Njira yochepetsera phokoso ndi:
1. Choyamba, maikolofoni yachidziwitso yomwe imayikidwa m'makutu imazindikira phokoso laling'ono (100 ~ 1000Hz) m'malo omwe amatha kumveka ndi khutu (mpaka 3000hz pakalipano).
2. Kenaka chizindikiro cha phokoso chimatumizidwa ku dera lolamulira, lomwe limagwira ntchito nthawi yeniyeni.
3. Nyanga ya hi fi imatulutsa mafunde omveka okhala ndi gawo lotsutsana ndi matalikidwe ofanana ndi phokosolo kuti athetse phokosolo.
4. Choncho phokosolo limatha ndipo silimveka.
Kuchepetsa phokoso kumagawika kukhala ANC, ENC, CVC ndi DSP, ndiye tiyeni tiwunike tanthauzo la Chingerezi.
Mfundo yogwira ntchito ya ANC: (kuwongolera phokoso logwira ntchito) ndikuti maikolofoni imasonkhanitsa phokoso lakunja lozungulira, ndiyeno kachitidwe kameneka kamasintha kukhala phokoso lopanda phokoso ndikuwonjezera kumapeto kwa nyanga.Pomaliza, phokoso lomwe limamveka m'makutu a anthu ndi: phokoso lozungulira + phokoso lozungulira.Phokoso la mitundu iwiriyi ndi lapamwamba kwambiri kuti lichepetse phokoso lakumva, ndipo wopindula ndi iye mwini.Kuchepetsa phokoso lokhazikika kumatha kugawidwa mu feedforward yogwira pochepetsa phokoso ndikuyankha kumachepetsa phokoso molingana ndi malo otengera maikolofoni.
Enc: (kuletsa phokoso lachilengedwe) kumatha kupondereza 90% ya phokoso lachilengedwe, kuti muchepetse phokoso lachilengedwe mpaka 35dB, kuti osewera azilankhulana momasuka.Kupyolera m'magulu a maikolofoni apawiri, werengerani molondola kumene wokamba nkhani akuyankhulira, ndikuchotsa phokoso lamtundu uliwonse m'malo ozungulira ndikuteteza mawu omwe akulunjika kumbali yayikulu.
CVC: (kujambula mawu momveka bwino) ndiukadaulo wochepetsera phokoso wa pulogalamu yama foni.Makamaka pamawu opangidwa panthawi yoyimba.Kupyolera mu pulogalamu yathunthu ya maikolofoni ya duplex denoising, imapereka echo ndi ntchito yochotsa phokoso lakuyimba.Ndiukadaulo wapamwamba kwambiri wochepetsera phokoso pamutu wama foni a Bluetooth pakadali pano.
DSP: (kukonza ma siginecha a digito) imayang'ana kwambiri phokoso lapamwamba komanso lotsika.Mfundo yogwira ntchito ndi yakuti maikolofoni amasonkhanitsa phokoso lakunja, ndiyeno makina amakopera phokoso laling'ono lofanana ndi phokoso lakunja kuti athetse phokosolo, kuti akwaniritse bwino kuchepetsa phokoso.Mfundo yochepetsera phokoso la DSP ndi yofanana ndi kuchepetsa phokoso la ANC.Komabe, phokoso lakutsogolo ndi lakumbuyo la kuchepetsa phokoso la DSP silimakhudzidwa mwachindunji ndikuthetsana mkati mwadongosolo.
—————————————————
Chidziwitso chaumwini: Nkhaniyi ndi nkhani yoyambirira ya CSDN blogger "momo1996_233", yomwe ikutsatira mgwirizano wa kukopera wa CC 4.0 by-sa.Kuti musindikizenso, chonde phatikizani ulalo woyambira ndi chidziwitsochi.
Ulalo woyambira: https://blog.csdn.net/momo1996_233/article/details/108659040
Nthawi yotumiza: Mar-19-2022
