![]() ![]() ![]() Based on these studies, Eilex has developed a headphone signal processing algorithm called the Eilex Binaural process. Eilex’ proprietary VIR (Variable-resolution Impulse Response) filter solves this problem, providing highest accuracy and resolution using minimal computational resources.Įilex has studied headphone audio from both the physical and psychoacoustic aspects for many years. The conventional FIR or IIR filter cannot be a practical solution. ![]() The total frequency response of the combined filter is quite complex. All such filtering must be accomplished by using one or two filters. Solutions by EilexĮilex Binaural converts regular stereo materials into Binaural format in real-time.īinauralization makes high quality headphone sound reproduction promising, but there are still some remaining problems, such as correct HRTF measurement determination of HRTF frequency range treatment of higher frequencies over the HRTF range and management of personal frequency response of outer and middle ears. (The Binaural recording is the most suitable for reproduction using headphones, but not for speakers.) 3. Thus the Binaural recording automatically includes the cross-feed, HTFR and time delay. To mimic the physical auditory situation, the Binaural recording is performed by using a dummy head and torso with microphones buried in the ears. There is a recording technique called Binaural recording, which is intended to be reproduced by headphones. This time difference must be included in the cross-feed, because it directly relates to the perception of sound in terms of directionality and spatial image. This is called HRTF (Head Related Transfer Function).Īnother important factor is that there is a time delay between the sound arriving at the left and right ears from a speaker. We have to include this frequency response of the reflection/diffraction to mimic real world circumstances. This adds quite complex filtering to the sound. When using speakers, the L and R sound reach both ears, the sound reflects and diffracts around the head, outer ears, torso and shoulders. This technique is called cross-feeding.īut cross-feeding creates a new problem: it tends to muffle the tone, and we cannot simply boost the highs to get the right sound. It is known that feeding a part of the sound from the opposite channel reduces the problem. This problem has been studied by many researchers for long time. This is the reason why the headphone audio produces a strange sound image and an uncomfortable feeling. When listening through headphones, each ear only hears one channel. When listening to a stereo system, both ears can hear both the L and R speakers. The cause of the problem is reproducing materials meant for speakers with headphones. These problems do not happen with speakers. The placement of instruments in an orchestra get mixed up.Background instruments move from behind a singer to the sides.Different parts of the sound from the same instrument come from different directions.Details are over-emphasized, damaging the tonal balance.Panned sound shifts to the extreme left or right.A vocal in the center moves to the middle of your head.Compared to speakers, the disadvantages of headphones are: ![]() Headphones/earphones always deliver an artificial sound image, regardless of their quality. Problems of Headphone Sound Reproductionġ. ![]()
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