Our ability to locate the position of sound sources  in a three-dimensional world has been studied by researchers for almost 100 years. Even though many developments like stereo sound were made in the sound recording technology through the earlier decades of 20th century ,they never seem to fully reproduce sounds absolutely authentically. The” real” sound should generate knowledge about its location in the listener. Modern sound recording technologies such as binaural & holophonic recording can produce 3 Dimensional sound effects.

Binaural Recording

Binaural dummy head
Binaural technique differs from mono, stereo and surround sound recordings in that we can determine the exact distance and direction of the given sound. By virtual sound sources a variety of effects can be applied enhancing your experience being in a different atmosphere.  With the additional effects conveyed by separate sound sources , all kinds of atmospheres can be created wrapping up you in a virtual environment.

It consist of a two-track recorder which is connected to two hi-fidelity microphones that are contained within a dummy  head,  inset in ear-shaped molds to fully capture all of the audio frequency adjustments (known as head-related transfer functions (HRTFs) ) that happen naturally as sound wraps around the human head. The dummy head contains ears, sinus cavities and other similarities to a human head.  So the microphones really “hear” the sound rather than recording. Once recorded, the binaural effect can be reproduced using headphones or a dipole stereo.

use your headphones and watch this video



Holophonics

Holophonics is another sound recording technology created by Argentine Hugo Zuccarelli in 1980. Zuccarelli states that the human auditory system is a sound emitter, producing a reference sound that combines with incoming sound to form an interference pattern inside the ear. The nature of this pattern is sensitive to the direction of the incoming sound. According to the hypothesis, the cochlea detects and analyzes this pattern as if it were an acoustic hologram. The brain then interprets this data and infers the direction of the sound. Holophonic Sound is produced by recording the interference pattern generated when the original recorded signal is combined with an inaudible digital reference signal. Holophonic Sound waves stimulate our brains to reproduce very realistic and truly three dimensional sound within us, thereby stimulating other corresponding responses that our brains expect to accompany the sound.The holophonic sound technology is more  realistic than binaural recording. Holophonic sound is not yet ready for normal speaker systems. It is best heard in headphones, or through use of specially designed speakers.



3-Dimensional sound technologies and its various applications are still being studied by universities worldwide.

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