Abaninzi abavelisi bee-audio banikela ngeelwimi ze-headphone / earphone ngeteknoloji esebenzayo yokukhansela (ANC). Ezi zilungele abantu abaphulaphule umculo okanye babukele iividiyo kwiindawo ezinomsindo kunye / okanye xa behamba. Nangona kunjalo, akuyiyo yonke i-ANC idalwe ngokulinganayo. Sijonga indlela iBose QuietComfort 20 (QC-20) yentsimbi ye-acoustic ye-annular earring.
Bose QuietComfort 20 Iimilinganiselo
Salinganisa ukusebenza kwe-QC-20 usebenzisa i-GRAS 43AG indlebe / itekisi isilulator, i-analyzer yomsindo we-Clio FW, ikhompyutha ye-laptop eqhuba i-TrueRTA software kunye ne-interface ye-audio audio ye-M-Audio, kunye ne-Musical Fidelity V-Can. (Asifane sisebenzise i-earphone / ihlathi yesimulator epheleleyo ukulinganisa i -headphones ye-headphones , kodwa ngenxa yesimo esingavamile se-QC-20 se-silicon tips, akuzange ifanelane kakuhle ne-GRAS RA0045 ikhamera evame ukusetshenziswa kwimilinganiselo ezindlebeni.)
Iimilinganiselo zalinganiselwe kwindawo yokungena kwindlebe (i-EEP), ngokucacileyo kwinqanaba elikulo lendawo efile ekuvulekeni kwendlebe yakho yomlomo. Sasebenzise indlela yokucoca ye-43AG ukuqinisekisa isiqulatho esihle somfono kwi simulator kunye nesiphumo esifanayo. Qaphela ukuba ngaphaya kokulinganisela kwi-EEP, asiyisebenzisi insimu ye-diffuse okanye enye ikhefu lokubuyisela. (Olunye uphando luye lwabuza ukuqinisekiswa kwaloo ntlawulo, kwaye kude kube le shishini livumelana ngokufanelekileyo, umgangatho oxhaswa ngophando, sikhetha ukubonisa idatha eluhlaza.)
Ukuqonda ubuchule be-QC-20, kulinganiswe nomqondiso we-1 mW kwi-32 ohms (ukulinganiswa okusemgangathweni kwe-impedance ye-headphones-amplified internally like QC-20) ngu-104.8 dB, ephakamileyo ngokwaneleyo ukufumana amanqanaba aphezulu mhlawumbi nayiphi na ifowuni yomthombo.
I-QC-20 Ukuphendula ngokuphindaphindiweyo
Ukuphendula ngokuphindaphindiweyo kwe-QC-20 kwicala lasekhohlo (oluhlaza okwesibhakabhaka) nelungileyo (obomvu), izinga lokuhlola elibhekiselelwe kuma-94 dB @ 500 Hz. Ayikho imilinganiselo yento eyenza "impumelelo" yokuphendula imvama kwii-headphones, kwaye ngenxa yokuba i-psychoacoustics iyanzima kwaye iimoya zendlebe ziyahluka, ukulungiswa phakathi kwamanqanaba okuphendulwa kweempendulo kunye nokuzimela ngokuzimela kwamanye amaxesha akucaci.
Nangona kunjalo, le tshathi ikuvumela ukuba uqhathanise imodeli ngokuchanekileyo. I-QC-20 ibonisa impendulo encinane engaphantsi kweendlebe ezininzi, ezivame ukuba ne-bump kwi-bass output malunga ne-100 Hz. Kwakhona kubonisa impendulo ebonakalayo ephawulekayo, enamandla amaninzi phakathi kwe-2 ne-10 kHz.
I-QC-20 Ukuphendula ngokuphindaphindiweyo, ingxolo ikhansela kwaye icime
Ukuphendula ngokuphindaphindiweyo kwe-QC-20, isiteshi sokunene, ngomsindo okhanselayo (ukulandelelana obomvu) kunye nokucima (umkhondo ophuzi). Njengoko ubona, impendulo ifana ngokufanayo kwiindlela zombini. Esi sisona siphumo esihle kakhulu esiye sabona kulo mvavanyo. Zonke ezinye iifowuni-ukukhansela i-headphone zivivinywa utshintsho lwempendulo yalo ubuncinci xa ukucinywa kwengxolo kuguqulwa; ngamanye amaxesha utshintsho kwisandi luphawulekayo (kwaye lunomsindo).
Ukubola kwe-QC-20
Ukubola kokubonakalayo (intsalela yamanzi) isicwangciso se-QC-20, isiteshi esifanelekileyo. Imijelo emide eluhlaza eluhlaza ibonisa ukuhlawulela, okungekho nto engathandekiyo. Akukho nto inokukhathazeka ngayo apha. Kuphela nje, kakhulu kuncinci (kwaye mhlawumbi inaudible) i-resonance malunga ne-2.3 kHz.
I-QC-20 Impendulo yokuphindaphinda, 5 ngokuchasene nempumelelo ye-oh ohms
Ukuphendula ngokuphindaphindiweyo kwe-QC-20, isiteshi sokunene, xa sondliwa yi-amp amp (Canal Fidelity V-Can) nge-5 ohms impedance yomkhiqizo (umtsalane obomvu), kunye ne-75 ohms impedance yemveliso (ulandelelwano oluhlaza). Eyona ndlela, imigca kufuneka ifakeke ngokugqibeleleyo, kwaye apha yenza; edla ngokuba yimeko kunye ne-headphones ekhulisiwe ngaphakathi njenge-QC-20. Ngaloo ndlela, impendulo ye-QC-20 ye-frequency balance and tonal balance will not change if you use a headphone low quality, njengalezo ezakhiwe kwii-laptops ezininzi kunye nee-smartphones ezingabizi.
Ukwahlukana kwe-QC-20
I-distortion epheleleyo ye-harmonic (THD) ye-QC-20, isiteshini sokunene, esilinganiswe kumgangatho wokuvavanya we-100 dBA. Umzantsi lo mgca usetshati, ngcono. Eyona nto yayiza kubakho umda wezantsi wetadi. Ngaphandle kwenkalo encane engama-4% ekuphambukeni kwe-600 Hz, ukuphazamiseka kwe-QC-20 kuphantsi kakhulu, ngokukodwa kwi-bass.
QC-20 Isolation
Ukwahlukana kwe-QC-20, isiteshi sokunene, ngokukhishwa kwengxolo (ukulandelelana okuluhlaza) kunye nokukhanselwa kwengxolo kwi-(trace purple). Amanqanaba angaphantsi kwe-75 dB abonisa ukunyanzelwa kwengxolo engaphandle (okt, i-65 dB kwitshathi kuthetha ukunciphisa -10 dB kwizandi ezingaphandle kweso sandi). Umgca wezantsi usetshati, ngcono.
Kwii-frequencies eziphezulu, isiphumo sokukhansela isandi kakuhle, malunga -20 ukuya kwi -25 dB. Kwizithuba eziphantsi, apho isandi esivela kwiinjini zejethi zihlala khona, umphumo kukuhle kakhulu ukuba sikhumbule ukulinganisa, ngokufanelekileyo -45 dB kwi-160 Hz. Oku kufana nokunciphisa kweepesenti ezingama-96 kwinqanaba lezandi. Qaphela ukuba umkhondo obomvu uphahla phantsi kwetshathi.
I-QC-20 Impedance
Ukunyanzelwa kwe-QC-20, umzila ochanekileyo. Ngokuqhelekileyo, impedance engqinelanayo (okt, i-flat) kuzo zonke iimfono zilunge, kodwa nge-impedance ephakamileyo ye-QC-20 yangaphakathi yokufaka i-input amplifier, oku akukhathazekiyo.