This information is known as a Head Related Transfer Function and can be captured and used to process audio in real time, much like convolution reverb using an impulse response. The precise shape of the outer ear, the pinna, is unique to us as is the shape of our heads and torsos, all of which colour the sound our ears receive and our hearing systems become very finely tuned to our specific physiology.
For this we need to introduce the ways in which our unique physiology affects the sounds we hear. However this doesn’t explain how we can perceive sounds to be coming from behind or above us. Sounds coming from the right reach the right ear first, are a little louder and the left ear is masked by the head being between that ear and the sound source making it sound slightly different. The basic mechanism by which we locate sounds from left to right is well understood. Why did some people experience an utterly convincing, immersive experience while some just heard a slightly odd stereo recording? The answer is the effect of Head Related Transfer Functions. Whoops of excitement would show me who was really “getting” it but more interesting to me were the people who were left underwhelmed. However the best for getting an instant response was playing a binaural recording over headphones. Mid-side processing, time aligning mics on a 4x12, centre channel removal using inverted polarity to remove a vocal. There are a few audio crowdpleasers which I’ve found to be ideal material with which to grab the attention of people interested in audio who haven’t yet come across them.
#Binaural recording waterproof 3d sound full#
I used to run a music tech course and every year I’d be faced with a room full of new students with more enthusiasm than experience. In this article Julian looks at the significance of our own physiology on how well binaural renders translate to the listener and explores some potential solutions to this lack of translation for some listeners.
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