Ntau ntau rau hauv kev ua suab nrov ntawm lub tso suab lossis lub tsev ua yeeb yam hauv tsev. Lub ntim tswj yog lub ntsiab tswj cov neeg ncav cuag, tab sis nws tsuas tuaj yeem ua tau ntau heev los cuam tshuam qhov zoo ntawm kev mloog zoo. Dynamic headroom, dynamic range, thiab dynamic compression yog lwm yam ntxiv uas tuaj yeem ua rau kev mloog tag nrho.
Dynamic Headroom: Fais fab Thaum Koj Xav Tau
Rau chav sau suab, lub tso suab lossis lub tsev ua yeeb yam hauv tsev yuav tsum tau muab qee yam ntawm lub zog rau koj cov neeg hais lus. Vim hais tias cov suab nrov hloov pauv tas li thoob plaws hauv cov suab paj nruag thiab cov yeeb yaj kiab, tus txais yuav tsum tau kho nws lub zog tso zis sai thiab zoo ib yam.
Dynamic headroom yog hais txog lub peev xwm ntawm lub tso suab, lub tsev ua yeeb yam hauv tsev, lossis lub suab nrov kom tawg lub zog mus rau qib siab dua rau lub sijhawm luv luv. Qhov no txhais tau hais tias kom haum rau cov suab paj nruag ncov lossis lub suab nrov heev hauv cov yeeb yaj kiab. Nws yog ib qho tseem ceeb tshwj xeeb tshaj yog nyob rau hauv lub tsev ua yeeb yam, qhov twg qhov kev hloov pauv loj tshwm sim thoob plaws hauv zaj yeeb yaj kiab.
Dynamic headroom yog ntsuas hauv decibels (dB). Yog hais tias lub receiver los yog amplifier muaj peev xwm ua tau ob npaug rau nws lub zog tas li tso zis muaj peev xwm, nws yuav tsum muaj 3 dB ntawm dynamic headroom. Txawm li cas los xij, ob npaug ntawm cov zis hluav taws xob tsis tau txhais hais tias qhov ntim ntawm ob npaug. Txhawm rau muab ob npaug rau qhov ntim los ntawm qhov muab, tus txais lossis lub tshuab ua kom nrov nrov yuav tsum nce nws lub zog tso tawm los ntawm qhov zoo ntawm 10.
Qhov no txhais tau hais tias yog lub receiver lossis amplifier tawm 10 watts ntawm ib qho chaw tshwj xeeb, thiab kev hloov pauv sai sai ntawm lub suab yuav tsum tau muab ob npaug rau lub ntim rau lub sijhawm luv luv, lub amplifier lossis receiver yuav tsum tau ceev ceev. tso zis 100 watts.
Dynamic headroom muaj peev xwm yog ci rau hauv kho vajtse ntawm lub receiver lossis amplifier, thiab nws tsis tuaj yeem hloov kho. Qhov zoo tshaj plaws, tus txais kev ua yeeb yam hauv tsev yuav muaj tsawg kawg yog 3 dB lossis ntau dua ntawm lub taub hau dynamic. Qhov no kuj tuaj yeem qhia tau los ntawm tus txais lub siab tshaj plaws lub zog tso zis ntsuas. Piv txwv li, yog tias qhov siab tshaj plaws los yog lub zog hluav taws xob tso tawm qhov ntsuas yog ob npaug ntawm qhov teev lossis ntsuas RMS, Nruam, lossis FTC lub zog ntsuas, qhov no yuav yog kwv yees li ntawm 3 dB dynamic headroom.
Dynamic Range: Mos vs. Suab nrov
Nyob rau hauv suab, dynamic ntau yam yog qhov piv ntawm lub suab nrov tshaj undistorted tsim nyob rau hauv kev sib raug zoo rau lub softest suab uas yog tseem audible. Ib dB yog qhov sib txawv me me uas tib neeg pob ntseg tuaj yeem ntes tau. Qhov txawv ntawm lub suab ntxhi thiab suab paj nruag suab nrov (ntawm tib qhov deb ntawm koj pob ntseg) yog li 100 dB.
Qhov no txhais tau hais tias, siv qhov ntsuas dB, kev hais kwv txhiaj pob zeb yog 10 billion zaus nrov dua li ntxhi. Rau cov suab paj nruag kaw, tus txheej txheem CD muaj peev xwm rov tsim dua 100 dB ntawm ntau yam dynamic, thaum LP cov ntaub ntawv saum toj kawg nkaus ntawm 70 dB.
Thaum nws los txog rau lub tso suab, lub tsev ua yeeb yam hauv tsev, thiab lub tshuab hluav taws xob, koj xav tau ib yam dab tsi uas tuaj yeem tsim ntau yam ntawm CD lossis lwm qhov chaw. Ib qho teeb meem nrog cov ntsiab lus uas tau sau tseg nrog ntau qhov sib txawv yog qhov "qhov deb" ntawm qhov muag muag thiab nrov tshaj plaws tuaj yeem ua rau khaus.
Piv txwv li, hauv cov suab paj nruag tsis zoo, lub suab yuav tshwm sim los ntawm cov cuab yeej tom qab, thiab hauv cov yeeb yaj kiab, cov lus sib tham yuav mos dhau los nkag siab, txawm tias lub suab nrov tuaj yeem hnov txog txoj kev.
Qhov no yog qhov Dynamic Compression tuaj.
Dynamic Compression: Squeezing Dynamic Range
Dynamic compression tsis yog hais txog hom compression hom siv hauv cov suab (xws li MP3). Hloov chaw, dynamic compression yog ib qho cuab yeej uas tso cai rau tus mloog hloov kev sib raug zoo ntawm qhov nrov tshaj plaws thiab ntsiag to ntawm lub suab nrov thaum ua si CD, DVD, Blu-duab tshav Disc, lossis lwm hom ntawv.
Piv txwv li, yog tias qhov tawg lossis lwm cov ntsiab lus ntawm lub suab nrov dhau lawm thiab cov lus sib tham yog mos dhau lawm, koj yuav xav nqaim qhov dynamic ntau yam tam sim no hauv lub suab. Ua li no ua rau lub suab tawg tsis nrov heev, tab sis lub dialog suab nrov dua. Qhov no ua rau tag nrho lub suab ntau dua, uas yog qhov tseem ceeb thaum ua si CD, DVD, lossis Blu-duab tshav Disc ntawm qhov ntim qis.
Nyob rau hauv tsev ua yeeb yam txais tos lossis cov khoom siv zoo sib xws, tus nqi ntawm cov dynamic compression yog hloov kho siv qhov chaw tswj uas yuav raug sau npe dynamic compression, dynamic ntau yam, lossis DRC.
Zoo zoo li lub npe nrov dynamic compression tswj tshuab suav nrog DTS TruVolume, Dolby Volume, Zvox Accuvoice, thiab Audyssey Dynamic Volume. Tsis tas li ntawd, qee qhov kev hloov pauv hloov pauv lossis kev tswj hwm kev tswj hwm tuaj yeem ua haujlwm thoob plaws ntau qhov chaw, xws li thaum hloov cov channel hauv TV kom tag nrho cov channel nyob rau tib theem ntim, lossis taming cov kev lag luam nrov nrov hauv TV program.
Txoj kab hauv qab
Dynamic headroom, dynamic range, thiab dynamic compression yog qhov tseem ceeb cuam tshuam rau qhov ntau ntawm ntim hauv ib puag ncig mloog. Yog tias kho cov qib no tsis kho cov teeb meem uas koj tau ntsib, xav txog kev saib rau lwm yam xws li kev cuam tshuam thiab chav acoustics.
