burning777 skrev:Bliver spændende at lytte til det album med hovedtelefoner. Må være som at sidde der selv.
Teknologien er faktisk udviklet specifikt med henblik på hovedtelefon-brug og der er sågar producenter, der laver hovedtelefoner specielt hertil. Ex.: http://www.etymotic.com/ephp/er4.aspx
F.sva. almindelige hovedtelefoner er der også forskel på, hvor godt de dur til formålet. Fra Wikipedia:
"However, these in-ear-canal phones tend to suffer from poor externalization i.e. inside-head localization. It is also found that even normal headphones suffer from poor externalization, especially if the headphone completely blocks the ear from outside. A better design for externalization found in experiments is the open-ear one, where the drivers are sitting in front of the pinneae with the ear canal connected to the air. The hypothesis is that when the ear canal is completely blocked, the radiation impedance seen from the eardrum to the outside has been altered, which negatively affects externalization.
There are some complications with the playback of binaural recordings through normal headphones. The sound that is picked up by a microphone placed in or at the entrance of the ear channel has a frequency spectrum that is very different from the one that would be picked up by a free-standing microphone. The diffuse-field head-transfer function, that is, the frequency response at the ear drum averaged for sounds coming from all possible directions, is quite grotesque, with peaks and dips of 10 dB. Frequencies around 5 kHz in particular are strongly attenuated as compared to side-presentation. If headphones were designed to have a flat response, then they would sound much too 'bright' when used to listen to stereo recordings and for this reason, most headphones are designed to have a notch around 5kHz. This can only ever approximate to a particular listener's ears, meaning that there can be no such thing as a 'flat' pair of headphones - they have to match the listener's ears, unlike speakers which aim to produce a flat free field response. For binaural listening though, the headphones need to have a flat response to the ear-canal entrance (not the eardrum) since it is at the ear-canal entrance that the recording microphones are placed. While it is in theory possible to equalise any headphones for a flat response at the entrance, a better approach is to use headphones designed without the notch in the first place.
The fact that most headphones are actually designed to have a notch in the 5kHz region is not widely understood, and this may have led to errors in the assessment of binaural recordings, since flat headphones are not normally available, and 'high quality' headphones incorporate the notch just like any others, though perhaps with a better approximation to that needed by the average ear. Male and female ears are of course different in size, and the outer ear gets bigger with increasing age, raising the possibility that most headphones are only really suited to young men. If headphones were designed to be flat, with a choice of equalisations available in headphone amplifiers, then headphone listening could be a more controlled experience, whether in binaural or stereo mode."
Hvis man skal opnå noget af effekten på et almindeligt anlæg, vil det forudsætte convolution med FIR-filtre, der korrigerer for egenakustikken ens eget lytterum og der vil da stadig være noget at hente med hovedtelefoner, da optagelsesmetoden ikke tager højde for afstanden mellem højttalere og lytterens ører.
burning777 skrev:Er den teknik brugt i andet musik - ville gerne finde Jazz som er optaget på den måde.
Nogen der kender noget?
Fra Wikipedia.org
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