Re: Akustika posluchovky part1 :: Remember, remember, the velvet November


node:	Re: Akustika posluchovky part1
template:	4
parent:	Akustika posluchovky part1
owner:	.db
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created:	02.05.2013 - 10:11:18

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ABSOLUT
KYBERIA

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system:	public
net:	yes

cauko, nedaju sa taketo veci osefovat ekvalizacne pomocou dakej elektroniky, ze sa proste nastavi charakteristika miestnosti pomocu mikrofonu a podla toho sa upravi zvuk?

00000101000635330062938400064627071587460715975407334877

+ vlastne mi teraz este napadlo, ze na basoch to je este zapeklitejsie, ak potrebujes vyriesit posluch zo sirsieho priestoru (a nie len sweet spot jedneho posluchaca), pretoze basy su akustikou zvyraznovane a potlacane v zavislosti od pozicie v miestnosti. mas miesta kde ti dana frekvencia hra kvoli blbej akustike 2x hlasnejsie a mas miesta kde nehra vobec (jej odraz tam doraza v protifaze) a to mozes ekvalizaciou vyriesit iba pre nejaky bod v priestore, no meter vedla tomu o to viac uskodis...

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::.: ti dobre napisal a mozem v jednej casti tejto serie aj o tom popisat

zatial v skratke len tolko ze som to skusal (okrem meracieho mikrofonu a free softu REW) potrebujes prehravac, ktory vie upravit zvuk pomocou dodaneho impulse-responsu (napriklad jRiver media center, alebo podobne prehravace

0000010100063533006293840006462707158746071597540716062507304385

hm, pokial viem, tak od visty ma windows podporu pre 'room correction'. takze ak mas kvalitny mikrofon...

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o kvalite built-in room correction by som pochyboval, ale neskusal som to. specialne koli takymto experimentom mam windows8 v bootcampe, ale velmi nerad do toho chodim :) ak to niekto skusi a bude mat pozitivne vysledky tak skusim :)

zatial som room correction skusal v JRiver media center pre MAC a na squeezeboxe. oba vysledky boli sice pekne co sa tyka frekvencnej charakteristiky, ale kvalita zvuku degradovala - mozno fazove problemy, alebo nieco podobne :(

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neviem posudit. pamaetam si to este z technickych clankov/videii k viste. som na telefonke, tak len takto:
http://windowsteamblog.com/windows/archive/b/windowsvista/archive/2006/08/24/450038.aspx

"Room Correction
Configuring audio in a home theater can take a good deal of time to get just right. Dialog and sound effects should sound as impressive as possible. For this purpose, Windows Vista now features Room Correction processing, which will find a "sweet spot" for the listener. The settings optimize the listening experience for a particular location in the room—for example, the center cushion of your couch—by automatically calculating a combination of delay, frequency response, and gain adjustments. This technology works differently than similar features in high-end receivers since it better accounts for the way the human ear processes sound. With this advance, sound is better matched to the on-screen image. This feature is also useful for users who place their desktop speakers in nonstandard locations.

Room correction requires the use of a microphone to calibrate its settings. The microphone is placed at the location the user intends to sit, and then the user activates a wizard that measures the room response. Using a set of specifically designed tones from each loudspeaker in turn, the computer calculates the distance, frequency, response and overall gain of each loudspeaker from the listening location at the microphone. This is applicable to both stereo and multi-channel systems. Once these measurements have been made, they are stored as a profile. This profile is used by the room correction DSP to correct the delay, overall gain, and frequency balance between loudspeaker locations so that the listening area will have a good stereo and multi-channel soundstage with improved timbre, envelopment, and front and back sensation compared to the uncorrected system.

If the user has a good microphone, the room and loudspeaker correction will automatically attempt to flatten the frequency response of each channel to compensate for relative differences in each channel, as well as any deficiencies in the frequency response from each channel."

windows sound ludi by som nepodcenoval, microphone arrays mali krasne funkcne uz vo viste, konkurencia sa len teraz zacina dotahovat. ale room correction som netestoval, takze tvoje pochybnosti su samozrejme na mieste ;)

0000010100063533006293840006462707158746071597540716062507169881

cau ja som myslel skor na daky hardver co to ma v sebe nakodene, ako ten denon alebo marantz avr. teraz som kecal s jednym kamosom co vyraba vlastne procesory pre radia a vysvetlil mi to taktiez tak, ze je to len scasti riesenie kedze zvuk sa dynamicky meni od nahravky k nahravke a k tomu aby si mal stale co najlepsi zvuk by aj pri tomto systeme pomohla priama spatna vazba, ktoru nema. cize keby tam boli tie mikrofony stale. ako ale vravis, stale ti to neriesi vibracie, odrazy apod. pis, pis, zaujimave citanie. mozes aj prihodit dake weby prip. shopy kde sa daju tie vecicky o ktorych pises zohnat, pripadne napisat konkretnejsie aspon nazvy tych vyrobkov/modelov. idem sa totizto coskoro stahovat do noveho a budem tam mat presklennu celu stenu v obyvke, minimum kobercov apod = akusticke peklo, cize to budem musiet dako riesit.

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ik multimedia robi tento plugin.
http://www.ikmultimedia.com/products/arc/
mal som ho nejaky cas ale povazujem to za dost experimentalne riesenie.

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staci ti:

1. meraci mikrofon (napr lacne riesenie UMIK-1 od. minidsp, aj ked mali s jednym batchom problem - ale nie zavazny akurat ze kalibracia musi byt dost nahlas takze to nie je moc prijemne :) )

2. soft ktory ti zahraje a nahraje meraci sweep - napriklad ten free REW

Linky na MiniDSP aj REW (stranka HomeTheatherShack, REW je skratka per Room Equalisation Wizard) su v povodnom clanku.

Co sa tyka samotneho merania tak k REWu je fajn PDF manual a ja cca o dva tyzdne (ked mi dorazi a nainstalujem zvysok akustickych materialov) napisem druhu cast "clanku" kde strucne popisem ako take meranie spravit (rozsiahlo je to popisane v tom manuale k REWu)

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ciastocne to pomoze, ale nevyriesi uplne, pretoze efekt rezonancii izby nieje len o hlasitosti frekvencnych zloziek, ale aj o ich doznievani. aj preto sa merania izby robia casto do 3D grafu, kde mas os nielen pre frekvenciu a amplitudu, ale aj pre cas, vdaka comu vidis, ktore frekvencie ako dlho doznievaju. a ked nejaku problematicku frekvenciu len stisis a nezabranis jej rezonovaniu, tak si tym sice vies dorovnat freq.response na +- flat, no to rezonovanie/doznievanie tam tak ci tak ostane a bude to znie rovnako rozmazane/nekonkretne ako predtym.

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taketo daco som mal na mysli, poor man's solution :)
http://www.audyssey.com/tags/multeq-xt32
vraj je to v AVRkach od Denonu a Marantzu

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jasne, ale urcite je lepsie najprv osetrit aspon hrube chyby v akustike priestoru.