3D audio and immersion with headphones aim to create a realistic and spatial sound experience that resembles natural hearing by positioning sound sources precisely in space. The common technologies used to produce 3D audio with headphones are:
Binaural recordings, where special microphones placed in the ears of an artificial head or inside ear-shaped shells capture sound from the environment in the same way the human ear would.
The resulting recordings contain spatial information required to reconstruct the direction and distance of sound sources. When played back through headphones, this creates an enhanced spatial perception of sound. However, the listener’s own ear is not used to achieve a perfectly natural listening experience.
HRTF (Head-Related Transfer Function) describes how sounds from different directions and distances reach the ear. It takes into account how sound is influenced by the outer ear, the head, and the upper body. In 3D audio, HRTF is used to model sound so that it appears to come from a specific direction. This is often used in real-time software to create immersive audio experiences.
ULTRASONE also follows the approach of considering HRTF, but not by implementing it electronically or simulating it through binaural recordings. The S-LOGIC approach, the core technology of ULTRASONE, is to deliver the sound to the user’s ear in such a way that the HRTF is perceived with the listener’s own ear—entirely without electronics.
Surround sound simulation technologies such as Dolby Headphone, Atmos, or DTS Headphone:X use surround sound simulation to process audio so that it appears spatially precise when played through headphones. These technologies use complex algorithms to position sounds in a virtual space.
They create a virtual sound field around the listener by arranging the sound in multiple virtual channels to produce the illusion of a 360-degree sound system. These technologies interact extremely well with S-LOGIC technology and result in a highly detailed sound image.
Overall, 3D audio in combination with headphones enables an extremely realistic and immersive sound environment that makes listening more natural and spatial than with traditional stereo headphones.
However, true perfection is only achieved when the listener’s own outer ear is included in the headphone acoustics. Only in this way can optimal results be achieved.
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